title:
The Origin of Spontaneous Symmetry Breaking in Theories with Large Extra
  Dimensions

abstract:
  We suggest that the electroweak Higgs particles can be identified with
extra-dimensional components of the gauge fields, which after compactification
on a certain topologically non-trivial background become tachyonic and
condense. If the tachyonic mass is a tree level effect, the natural scale of
the gauge symmetry breaking is set by the inverse radius of the internal space,
which, in case of the electroweak symmetry, must be around $\sim 1/$TeV. We
discuss the possibility of a vanishing tree level mass for the Higgs. In such a
scenario the tachyonic mass can be induced by quantum loops and can be
naturally smaller than the compactification scale. We give an example in which
this possibility can be realized. Starting from an Einstein--Yang--Mills theory
coupled to fermions in 10-dimensions, we are able to reproduce the spectrum of
the Standard Model like chiral fermions and Higgs type scalars in 4-dimensions
upon compactifying on ${\mathbb{C}}P^1\times {\mathbb{C}}P^2$. The existence of
a monopole solution on ${\mathbb{C}}P^1$ and a self dual U(1) instanton on
${\mathbb{C}}P^2$ are essential in obtaining chiral fermions as well as
tachyonic or massless scalars in 4-dimensions. We give a simple rule which
helps us to identify the presence of tachyons on the monopole background on
$S^2$.


title: Towards An Accurate Calculation of the Neutralino Relic Density

abstract:
  We compute the neutralino relic density in the minimal supersymmetric
standard model by using exact expressions for the neutralino annihilation cross
section into all tree-level final states, including all contributions and
interference terms. We find that several final states may give comparable
contributions to the relic density, which illustrates the importance of
performing a complete calculation. We compare the exact results with those of
the usual expansion method and demonstrate a sizeable discrepancy (of more than
10%) over a significant range of the neutralino mass of up to several tens of
GeV which is caused by the presence of resonances and new final-state
thresholds. We perform several related checks and comparisons. In particular,
we find that the often employed approximate iterative procedure of computing
the neutralino freeze-out temperature gives generally very accurate results,
except when the expansion method is used near resonances and thresholds.


title: Testing cosmological supersymmetry breaking

abstract:
  Banks has proposed a relation between the scale of supersymmetry breaking and
the cosmological constant in de Sitter space. His proposal has a natural
extension to a general FRW cosmology, in which the supersymmetry breaking scale
is related to the Hubble parameter. We study one consequence of such a
relation, namely that coupling constants change as the universe evolves. We
find that the most straightforward extension of Banks' proposal is disfavored
by experimental bounds on variation of the fine structure constant.


title: Implication of $\sin 2\beta$ from global fit and $B\to J/\psi K_S$

abstract:
  The measurement of $\sin 2 \beta$ is discussed within and beyond the standard
model. In the presence of new physics, the angle $\beta$ extracted from the
global fit(denoted by $\beta^{SM}_{fit}$) and the one extracted from $B\to
J/\psi K_S$ (denoted by $\beta_{J/\psi}$) are in general all different from the
'true' angle $\beta$ which is the weak phase of CKM matrix element $V^*_{td}$.
Possible new physics effects on the ratio $R_{\beta}=\sin2\beta_{J/\psi}/\sin
2\beta^{SM}_{fit}$ is studied and parameterized in a most general form. It is
shown that the ratio $R_{\beta}$ may provide a useful tool in probing new
physics. The experimental value of $R_{\beta}$ is obtained through an update of
the global fit of the unitarity triangle with the latest data and found to be
less than unity at 1$\sigma$ level. The new physics effects on $R_{\beta}$ from
the models with minimum flavor violation (MFV) and the standard model with
two-Higgs-doublet (S2HDM) are studied in detail. It is found that the MFV
models seem to give a relative large value $R_{\beta}\geq 1$. With the current
data, this may indicate that this kind of new physics may be disfavored and
alternative new physics with additional phases appears more relevant. As an
illustration for models with additional phase beyond CKM phase, the S2HDM
effects on $R_{\beta}$ are studied and found to be easily coincide with the
data due to the flavor changing neutral Higgs interaction.


title: Higgs' mass around 115 GeV would testify for composite Higgs

abstract:
  Theory with $SU(2)\times U(1)$ gauge invariant electroweak Lagrangian
describing standard interaction of massless quark doublet without elementary
scalar Higgs sector is considered. We show in the main order of $1/N_c$
expansion, that there exists a solution, which breaks initial symmetry and is
accompanied by an appearance of zero mass composite scalar doublet. The
electroweak loop corrections shift its mass to a tachyon value and thus the
scalar serves as a substitute for usual elementary Higgs. The $t$-quark mass
also arise. The problem of adjusting its observable mass leads to prediction of
triple gauge constant $\lambda_V \simeq -0.034$ without contradiction with
experimental data. The mass of the surviving composite Higgs scalar is
predicted to be $M_H = 117 \pm 7 GeV$, that agrees with recent indications of
$M_H \simeq 115 GeV$. The resulting theory contains realistic $W, Z, t$ masses,
composite massive Higgs and massless other particles. Parameters used are
cut-off $\Lambda \simeq 3500 GeV$, weak gauge constant $g$ and mixing angle
$\theta_W$.


title: Disagreement between standard model and experiment for muon g-2 ?

abstract:
  In a recent experimental paper reporting a precise measurement of the muon
anomalous magnetic moment, Brown et al. claim disagreement of their result with
evaluations based on the standard model. This claim is based on comparison with
a single theoretical evaluation. It is pointed out that other equally
legitimate theoretical evaluations exist in the literature, with which the new
experimental figure is quite compatible. The claim of indications for new
physics beyond the standard model does not appear justified. In this version we
take into account corrections to one of the works quoted, we include a new
discussion at the end, and also minor errors are corrected. The conclusions
remain unchanged.


title: Evolution equation for the structure function g_2(x,Q^2)

abstract:
  We perform an extensive study of the scale dependence of flavor-singlet
contributions to the structure function g_2(x,Q^2) in polarized deep-inelastic
scattering. We find that the mixing between quark-antiquark-gluon and
three-gluon twist-3 operators only involves the three-gluon operator with the
lowest anomalous dimension and is weak in other cases. This means, effectively,
that only those three-gluon operators with the lowest anomalous dimension for
each moment are important, and allows to formulate a simple two-component
parton-like description of g_2(x,Q^2) in analogy with the conventional
description of twist-2 parton distributions. The similar simplification was
observed earlier for the nonsinglet distributions, although the reason is in
our case different.


title: Constraints on Inflation Models from Supersymmetry Breakings

abstract:
  Effects of soft SUSY-breaking terms on inflation potentials are discussed.
There exist generic constraints that must be satisfied in order not for the
inflaton potential to loose its flatness. We examine explicitly the constraints
in the case of a hybrid inflation model and find that the coupling constant
\lambda between the inflaton and the ``water-fall-direction'' field is bounded
as 2.0 \times 10^{-6} < \lambda. This is a highly non-trivial result. Indeed,
if we adopt the severest constraint from avoiding the problem of the gravitinos
produced non-thermally, \lambda < 7.4 \times 10^{-6} is required, under a
reasonable assumption on the reheating process. This means that the hybrid
inflation model marginally has a viable parameter space. We also discuss
analogous constraints on other inflation models.


title:
Neutrino masses, muon g-2, and lepton-flavour violation in the
  supersymmetric see-saw model

abstract:
  In the light of the recent muon (g_mu-2) result by the E821 experiment at the
Brookhaven National Laboratory, we study the event rates of the charged
lepton-flavour-violating (LFV) processes in the supersymmetric standard model
(SUSY SM) with the heavy right-handed neutrinos (SUSY see-saw model). Since the
left-handed sleptons get the LFV masses via the neutrino Yukawa interaction in
this model, the event rate of mu->e gamma and the SUSY-SM correction to
(g_mu-2)/2 (\delta a_mu^{SUSY}) are strongly correlated. When the left-handed
sleptons have a LFV mass between the first and second generations
((m^2_L)_{12}) in the mass matrix, it should be suppressed by \sim 10^{-3}
({10^-9}/\delta a_mu^{SUSY}) compared with the diagonal components
(m_{SUSY}^2), from the current experimental bound on mu-> e gamma. The recent
(g_mu-2) result indicates {\delta a_mu^{SUSY}}\sim 10^{-9}. The future charged
LFV experiments could cover (m^2_L)_{12}/m_{SUSY}^2\gsim 10^{-(5-6)}. These
experiments will give a significant impact on the flavour models and the
SUSY-breaking models. In the SUSY see-saw model (m^2_L)_{12} is proportional to
square of the tau-neutrino Yukawa-coupling constant. In the typical models
where the neutrino-oscillation results are explained and the top-quark and
tau-neutrino Yukawa couplings are unified at the GUT scale, a large LFV mass of
(m^2_L)_{12}/m_{SUSY}^2\gsim 10^{-4} is generated, and the large LFV event
rates are predicted. We impose a so-called no-scale condition for the
SUSY-breaking parameters at the GUT scale, which suppresses the FCNC processes,
and derive the conservative lower bound on mu-> egamma. The predicted Br(mu-> e
gamma) could be covered at the future LFV experiments.


title:
Master Formulae for Delta F=2 NLO-QCD Factors in the Standard Model and
  Beyond

abstract:
  We present analytic formulae for the QCD renormalization group factors
relating the Wilson coefficients C_i(mu_t) and C_i(mu), with mu_t = O(m_t) and
mu < mu_t, of the Delta F=2 dimension six four-quark operators Q_i in the
Standard Model and in all of its extensions. Analogous analytic formulae for
the QCD factors relating the matrix elements <Q_i(2 GeV)> and <Q_i(mu_K)> with
mu_K < 2GeV are also presented. The formulae are given in the NDR scheme. The
strongest renormalization-group effects are found for the operators with the
Dirac structures (1 - gamma_5)*(1 + gamma_5) and (1 - gamma_5)*(1 - gamma_5).
We calculate the matrix elements <\bar K^0|Q_i|K^0> in the NDR scheme using the
lattice results in the LRI scheme. We give expressions for the mass differences
Delta M_K and Delta M_B and the CP-violating parameter epsilon_K in terms of
the non-perturbative parameters B_i and the Wilson coefficients C_i(mu_t). The
latter summarize the dependence on new physics contributions.


title:
Precision Observables in the MSSM: Leading Electroweak Two-loop
  Corrections

abstract:
  The leading electroweak MSSM two-loop corrections to the $\rho$-parameter are
calculated. They are obtained by evaluating the two-loop self-energies of the Z
and the W boson at O(Gf^2 m_t^4) in the limit of heavy scalar quarks. A very
compact expression is derived, depending on the ratio of the CP-odd Higgs boson
mass, M_A, and the top quark mass, m_t. Expressions for the limiting cases M_A
>> m_t and M_A << m_t are also given. The decoupling of the non-SM contribution
in the limit M_A -> oo is verified at the two-loop level. The numerical effect
of the leading electroweak MSSM two-loop corrections is analyzed in comparison
with the leading corrections of O(Gf^2 m_t^4) in the SM and with the O(alpha
alpha_s) corrections in the MSSM.


title: Two-loop Calculations in the MSSM with FeynArts

abstract:
  Recent electroweak two-loop corrections in the Minimal Supersymmetric
Standard Model (MSSM) are reviewed. They have been obtained with the help of
the programs FeynArts and TwoCalc, making use of the recently completed MSSM
model file for FeynArts. Short examples of how to use the two codes together
with the analytic result for the O(Gf^2 m_t^4) corrections to the
$\rho$-parameter in the MSSM are presented.


title:
New Physics in the New Millennium with GENIUS: Double Beta Decay, Dark
  Matter, Solar Neutrinos

abstract:
  Double beta decay is indispensable to solve the question of the neutrino mass
matrix together with $\nu$ oscillation experiments. The most sensitive
experiment since eight years - the Heidelberg-Moscow experiment in Gran-Sasso -
already now, with the experimental limit of $<m_\nu > < 0.26$ eV excludes
degenerate $\nu$ mass scenarios allowing neutrinos as hot dark matter in the
universe for the small angle MSW solution of the solar neutrino problem. It
probes cosmological models including hot dark matter already now on the level
of future satellite experiments MAP and PLANCK. It further probes many topics
of beyond Standard Model physics at the TeV scale. Future experiments should
give access to the multi-TeV range and complement on many ways the search for
new physics at future colliders like LHC and NLC. For neutrino physics some of
them (GENIUS) will allow to test almost all neutrino mass scenarios allowed by
the present neutrino oscillation experiments. At the same time GENIUS will
cover a wide range of the parameter space of predictions of SUSY for
neutralinos as cold dark matter. Further it has the potential to be a real-time
detector for low-energy ($pp$ and $^7$Be) solar neutrinos. A GENIUS Test
Facility has just been funded and will come into operation by end of 2001.


title: Lepton Numbers in the framework of Neutrino Mixing

abstract:
  In this short review we discuss the notion of lepton numbers. The strong
evidence in favor of neutrino oscillations obtained recently in the
Super-Kamiokande atmospheric neutrino experiment and in solar neutrino
experiments imply that the law of conservation of family lepton numbers L_e,
L_mu and L_tau is strongly violated. We consider the states of flavor neutrinos
nu_e, nu_mu and nu_tau and we discuss the evolution of these states in space
and time in the case of non-conservation of family lepton numbers due to the
mixing of light neutrinos. We discuss and compare different flavor neutrino
discovery experiments. We stress that experiments on the search for
nu_mu->nu_tau and nu_e->nu_tau oscillations demonstrated that the flavor
neutrino nu_tau is a new type of neutrino, different from nu_e and nu_mu. In
the case of neutrino mixing, the lepton number (only one) is connected with the
nature of massive neutrinos. Such conserved lepton number exist if massive
neutrinos are Dirac particles. We review possibilities to check in future
experiments whether the conserved lepton number exists.


title: Non-linear evolution and parton distributions at LHC and THERA energies

abstract:
  We suggest a new procedure for extrapolating the parton distributions from
HERA energies to higher energies at THERA and LHC. The procedure suggested
consists of two steps: first, we solve the non-linear evolution equation which
includes the higher twists contributions, however this equation is deficient
due to the low ($log(1/x)$) accuracy of our calculations. Second, we introduce
a correcting function for which we write a DGLAP type linear evolution
equation. We show that this correcting function is small in the whole kinematic
region and decreases at low $x$. The nonlinear evolution equation is solved
numerically and first estimates for the saturation scale, as well as for the
value of the gluon density at THERA and LHC energies are made. We show that
non-linear effects lead to damping of the gluon density by a factor of
  $2 \div 3$ at $x \approx 10^{-7}$.


title:
Off-shell unitarity and geometrical effects in deep-inelastic scattering
  and vector-meson electroproduction

abstract:
  Deep-inelastic scattering at low x and elastic vector meson production are
considered on the basis of the off-shell extension of the s-channel unitarity.
We discuss behavior of the structure function F_2(x,Q^2) at low x and the total
cross-section of virtual photon-proton scattering and obtain, in particular,
the dependence sigma^{tot}_{gamma^* p}\sim (W^2)^{lambda(Q^2)} where exponent
lambda(Q^2) is related to the interaction radius of a constituent quark. The
energy dependence of the total cross-section of gamma^*gamma^*-interactions is
calculated. The explicit mass dependence of the exponent in the power energy
behavior of the vector meson production in the processes of virtual photon
interactions with a proton gamma^*p to Vp has been obtained. We also consider
angular distributions at large momentum transfers.


title: Proton stability in TeV-scale GUTs

abstract:
  We discuss the proton decay problem in theories with low gravity and/or GUT
scales. We pointed out that the gravity induced proton decay can be indeed
suppressed up to a desired level, while the GUT origin of the proton
instability is rather problematic. To solve this problem we suggest the GUT
model where the proton is stable in all orders of perturbation theory. This can
be simply achieved by the replication of quark-lepton families with ordinary
quarks and leptons residing in different GUT representations and by an
appropriate dimensional reduction. The model predicts extra mirror states which
along with the GUT particles and the excitations of extra dimensions could be
observable at high-energy colliders providing the unification scale is in the
TeV range.


title:
Constraints on Explicit CP Violation from the Brookhaven Muon g-2
  Experiment

abstract:
  We use the recently derived CP phase dependent analytic results for the
supersymmetric electro-weak correction to $g_{\mu}-2$ to constrain the explicit
CP phases in softly broken supersymmetry using the new physics effect seen in
the g-2 Brookhaven measurement. It is shown that the BNL data strongly
constrains the CP violating phase $\theta_{\mu}$ (the phase of the Higgs mixing
parameter $\mu$) and $\xi_2$ (the phase of the SU(2) gaugino mass $\tilde m_2$)
and as much as 60-90% of the region in the $\xi_2-\theta_{\mu}$ plane is
eliminated over a significant region of the MSSM parameter space by the BNL
constraint. The region of CP phases not excluded by the BNL experiment allows
for large phases and for a satisfaction of the EDM constraints via the
cancellation mechanism. We find several models with large CP violation which
satisfy the EDM constraint via the cancellation mechanism and produce an
$a_{\mu}^{SUSY}$ consistent with the new physics signal seen by the Brookhaven
experiment. The sparticle spectrum of these models lies within reach of the
planned accelerator experiments.


title: Axino - New Candidate for Cold Dark Matter

abstract:
  Supersymmetric extensions of the Standard Model when combined with the
Peccei-Quinn solution to the strong CP problem necessarily contain also the
axino, the fermionic partner of the axion. In contrast to the neutralino and
the gravitino, the axino mass is generically not of the order of the
supersymmetry breaking scale and can be much smaller. The axino is therefore an
intriguing candidate for a stable superpartner. The axinos are a natural
candidate for cold dark matter in the Universe when they are generated
non-thermally through out-of-equilibrium neutralino decays or via a competing
thermal production mechanism through scatterings and decays of particles in the
plasma. We identify axino masses in the range of tens of MeV to several GeV
(depending on the scenario) as corresponding to cold axino relics if the
reheating temperature T_R is less than about 5 \times 10^4 GeV. At higher T_R
and lower mass, axinos could constitute warm dark matter. In the scenario with
axinos as stable relics the gravitino problem finds a natural solution. The
lightest superpartner of the Standard Model spectrum will remain stable in
high-energy detectors but may be either neutral or charged. The usual
constraint Omega*h^2<1 on the relic abundance of the lightest neutralino does
not hold.


title: Hide and Seek with Neutralino Dark Matter WIMP

abstract:
  As experimental sensitivity increases, one is approaching the range of
WIMP-nucleon interaction strengths characteristic of neutralinos. But this
continuing progress also unearths new experimental challenges and
uncertainties.


title: Non-Baryonic Dark Matter

abstract:
  There exist several well-motivated candidates for non-baryonic cold dark
matter, including neutralinos, axions, axinos, gravitinos, Wimpzillas. I review
the dark matter properties of the neutralino and the current status of its
detection. I also discuss the axino as a new interesting alternative.


title:
Radiative Corrections to the Single Spin Asymmetry in Heavy Quark
  Photoproduction

abstract:
  We analyze in the framework of pQCD the properties of the single spin
asymmetry in heavy flavor production by linearly polarized photons. At leading
order, the parallel- perpendicular asymmetry in azimuthal distributions of both
charm and bottom quark is predicted to be about 20% in a wide region of initial
energy. Using the soft gluon resummation formalism, we have calculated the
next-to-leading order corrections to the asymmetry to next-to-leading
logarithmic accuracy. It is shown that radiative corrections practically do not
affect the Born predictions for the azimuthal asymmetry at energies of the
fixed target experiments. Both leading and next-to-leading order predictions
for the asymmetry are insensitive to within few percent to theoretical
uncertainties in the QCD input parameters: $m_{Q}$, $\mu_{R}$, $\mu_{F}$,
$\Lambda_{QCD}$ and in the gluon distribution function. Our analysis shows that
nonperturbative corrections to a $B$-meson azimuthal asymmetry due to the gluon
transverse motion in the target are negligible. We conclude that measurements
of the single spin asymmetry would provide a good test of pQCD applicability to
heavy flavor production at fixed target energies.


title: Z(N) wall junctions: Monopole fossils in hot QCD

abstract:
  We point out that the effective action of hot Yang--Mills theories has
semi-classical solutions, which are naturally identified with monopole world
lines, ``frozen'' into the short imaginary time dimension. The solutions look
like wall junctions: lines along which N electric Z(N) domain walls come
together. They are instrumental in reconciling explicit perturbative
calculations at high temperature with the magnetic Z(N) symmetry.


title: Light-Front Realization of Chiral Symmetry Breaking

abstract:
  We discuss a description of chiral symmetry breaking in the light-front (LF)
formalism. Based on careful analyses of several models, we give clear answers
to the following three fundamental questions: (i) What is the difference
between the LF chiral transformation and the ordinary chiral transformation?
(ii) How does a gap equation for the chiral condensate emerge? (iii) What is
the consequence of the coexistence of a nonzero chiral condensate and the
trivial Fock vacuum? The answer to Question (i) is given through a classical
analysis of each model. Question (ii) is answered based on our recognition of
the importance of characteristic constraints, such as the zero-mode and
fermionic constraints. Question (iii) is intimately related to another
important problem, reconciliation of the nonzero chiral condensate and the
invariance of the vacuum under the LF chiral transformation. This and Question
(iii) are understood in terms of the modified chiral transformation laws of the
dependent variables. The characteristic ways in which the chiral symmetry
breaking is realized are that the chiral charge is no longer conserved and that
the transformation of the scalar and pseudoscalar fields is modified. We also
discuss other outcomes, such as the light-cone wave function of the
pseudoscalar meson in the Nambu-Jona-Lasinio model.


title:
Combining the Muon Anomalous Magnetic Moment with other Constraints on
  the CMSSM

abstract:
  We combine the constraint suggested by the recent BNL E821 measurement of the
anomalous magnetic moment of the muon on the parameter space of the constrained
MSSM (CMSSM) with those provided previously by LEP, the measured rate of b to s
gamma decay and the cosmological relic density Omega-hsquared. Our treatment of
Omega-hsquared includes carefully the direct-channel Higgs poles in
annihilation of pairs of neutralinos chi and a complete analysis of chi -
slepton coannihilation. We find excellent consistency between all the
constraints for tan beta > 10 and mu > 0, for restricted ranges of the CMSSM
parameters m_0 and m_1/2. All the preferred CMSSM parameter space is within
reach of the LHC, but may not be accessible to the Tevatron collider, or to a
first-generation e^+ e^- linear collider with centre-of-mass energy below 1.2
TeV.


title:
Verifying the Kugo-Ojima Confinement Criterion in Landau Gauge
  Yang-Mills Theory

abstract:
  Expanding the Landau gauge gluon and ghost two-point functions in a power
series we investigate their infrared behavior. The corresponding powers are
constrained through the ghost Dyson-Schwinger equation by exploiting
multiplicative renormalizability. Without recourse to any specific truncation
we demonstrate that the infrared powers of the gluon and ghost propagators are
uniquely related to each other. Constraints for these powers are derived, and
the resulting infrared enhancement of the ghost propagator signals that the
Kugo-Ojima confinement criterion is fulfilled in Landau gauge Yang-Mills
theory.


title: Spin correlations and consequences of quantum-mechanical coherence

abstract:
  The difference in the properties of the spin correlation tensor for
factorizable and nonfactorizable two-particle states is analyzed. The
inequalities for linear combinations of the components of this tensor are
obtained for the case of incoherent mixtures of factorizable two-particle spin
states. They include the well known Bell inequalities and can be violated for
coherent superpositions of two-particle spin states. The possibility to verify
the consequences of the quantum-mechanical coherence is discussed using the
angular correlations in the asymmetric (parity violating) decays of the pairs
of spin-1/2 particles (muons, top-quarks or lambda-hyperons), the coherence
arising either from the production dynamics or due to the effect of quantum
statistics.


title: Parity-Violating Electron Scattering and Neucleon Structure

abstract:
  The measurement of parity violation in the helicity dependence of
electron-nucleon scattering provides unique information about the basic quark
structure of the nucleons. In this review, the general formalism of
parity-violating electron scattering is presented, with emphasis on elastic
electron-nucleon scattering. The physics issues addressed by such experiments
is discussed, and the major goals of the presently envisioned experimental
program are identified. %General aspects of the experimental technique are
reviewed and A summary of results from a recent series of experiments is
presented and the future prospects of this program are also discussed.


title:
Dispersion relation formalism for virtual Compton scattering off the
  proton

abstract:
  We present in detail a dispersion relation formalism for virtual Compton
scattering (VCS) off the proton from threshold into the
$\Delta(1232)$-resonance region. Such a formalism can be used as a tool to
extract the generalized polarizabilities of the proton from both unpolarized
and polarized VCS observables over a larger energy range. We present
calculations for existing and forthcoming VCS experiments and demonstrate that
the VCS observables in the energy region between pion production threshold and
the $\Delta(1232)$-resonance show an enhanced sensitivity to the generalized
polarizabilities.


title: Cancellation of Sudakov Logarithms in Radiative Decays of Quarkonia

abstract:
  We study infrared QCD effects in radiative quarkonia decays. We examine the
endpoint region z -> 1 of the photon spectrum. We point out a cancellation
mechanism for the corrections in $\alpha_s^n \ln^{m} (1-z)$, $m \leq 2 n$, in
the short-distance coefficient for the color-singlet Fock state in the
quarkonium. The cancellation is due to the coherence of the color radiation,
and applies even though logarithmic contributions are present in the jet
distributions associated with the decay. We comment on the implications of our
results for the modeling of hadronization in the endpoint region and for the
role of color-octet states in the quarkonium.


title: Non-Gaussian Correlations in the McLerran-Venugopalan Model

abstract:
  We argue that the statistical weight function W[rho] appearing in the
McLerran-Venugopalan model of a large nucleus is intrinsically non-Gaussian,
even if we neglect quantum corrections. Based on the picture where the nucleus
of radius R consists of a collection of color-neutral nucleons, each of radius
a<<R, we show that to leading order in alpha_s and a/R only the Gaussian part
of W[rho] enters into the final expression for the gluon number density. Thus,
the existing results in the literature which assume a Gaussian weight remain
valid.


title:
Determination of hadronic partial widths for scalar-isoscalar resonances
  f0(980), f0(1300), f0(1500), f_0(1750) and the broad state
  f0(1530^{+90}_{-250})

abstract:
  In the article of V.V. Anisovich et al., Yad. Fiz. 63, 1489 (2000), the
K-matrix solutions for the wave IJ^{PC}=00^{++} were obtained in the mass
region 450 - 1900 MeV where four resonances f0(980), f0(1300), f0(1500),
f0(1750) and the broad state f0(1530^{+90}_{-250}) are located. Based on these
solutions, we determine partial widths for scalar-isoscalar states decaying
into the channels pi-pi, K-anti K, eta-eta, eta-eta', pi-pi-pi-pi and
corresponding decay couplings.


title: Excited Q-Balls in the MSSM with gravity mediated supersymmetry breaking

abstract:
  Excited Q-balls are studied by numerical simulations in the Minimal
Supersymmetric Standard Model with supersymmetry broken by a gravity mediated
mechanism. It is found that there is a suppression factor of $\cO(10^{-2})$ in
the rate at which a Q-ball can emit their excess energy compared to the rate
set by the dynamical scale of the field, $m$. Furthermore, it is noted that a
Q-ball can withstand a large amount of excess energy without losing a
significant amount of its charge. The cosmological importance of these
properties are considered for Q-balls in the thermal bath of the early
universe.


title:
Gluon Contributions to Parity-Violating Asymmetries in Polarized
  Proton-Proton Scattering

abstract:
  We report on a calculation of one-loop weak corrections to polarized
quark-gluon scattering and the corresponding crossed channels. Such
contributions are suppressed formally by one power of alpha_s relative to W- or
Z-mediated quark-quark scattering, but would enable the spin asymmetry of the
gluon distribution to contribute to parity-violating asymmetries that will soon
be investigated in polarized proton-proton scattering experiments at RHIC. In
certain kinematic regions, gluon contributions to parity-violating asymmetries
can be as large as 10% of the tree-level W- and Z-exchanges in quark-quark
scattering, but usually only where the parity-violating asymmetries are already
small.


title: Study of Scalar Top Quarks in the Neutralino and Chargino Decay Channel

abstract:
  The scalar top discovery potential has been studied with a full-statistics
background simulation at sqrt(s)=500 GeV and L = 500 fb-1 for the TESLA
project. The beam polarization is very important to measure the scalar top
mixing angle and to determine its mass. The latest estimation of the beam
polarization parameters is applied. This study includes e+ polarization, which
improves the sensitivity. For a 180 GeV scalar top at minimum production cross
section, we obtain delta(m) = 0.8 GeV and delta(cosT) = 0.008 in the neutralino
decay channel, and delta(m) = 0.5 GeV and delta(cosT) = 0.004 in the chargino
decay channel.


title:
Comparison of Higgs Boson Mass and Width Determination of the LHC and a
  Linear Collider

abstract:
  Two important properties of a Higgs boson are its mass and width. They may
distinguish the Standard Model (SM) Higgs boson from Higgs bosons of extended
models. We show results from a direct mass and width reconstruction for a Higgs
boson mass range from 120 to 340 GeV. The mass and width have been
reconstructed from the H --> ZZstar --> mu+mu-mu+mu- reaction in an LHC
simulation of the CMS detector. The determined mass accuracy has been compared
with that obtained from studies for a linear collider (LC). The mass precision
from the latter studies is derived by scaling previous LC simulation results
according to the expected event rates. For the Higgs boson width we compare a
direct determination with indirect methods and find good complementarity.


title: Hadron masses and power corrections to event shapes

abstract:
  It is widely believed that hadronisation leads to 1/Q corrections to e+e-
event shapes. We show that there are further corrections, proportional to (ln
Q)^A/Q with A=4C_A/beta_0~=1.6, associated with hadron masses and whose
relative normalisations can be calculated from one observable to another. At
today's energies these extra corrections can be of the same order of magnitude
as `traditional' 1/Q corrections. They fall into two classes: universal and
non-universal. The latter can be eliminated by suitable redefinitions of the
observables.


title: Muon g-2, Dark Matter Detection and Accelerator Physics

abstract:
  We examine the recently observed deviation of the muon g - 2 from the
Standard Model prediction within the framework of gravity mediated SUGRA models
with R parity invariance. Universal soft breaking (mSUGRA) models, and models
with non-universal Higgs and third generation squark/slepton masses at M_G are
considered. All relic density constraints from stau-neutralino co-annihilation
and large \tan\beta NLO corrections for b \to s\gamma decay are included, and
we consider two possibilities for the light Higgs: m_h > 114 GeV and m_h > 120
GeV. The combined m_h, b \to s\gamma and a_{\mu} bounds give rise to lower
bounds on \tan\beta and m_{1/2}, while the lower bound on a_{\mu} gives rise to
an upper bounds on m_{1/2}. These bounds are sensitive to A_0, e.g. for m_h >
114 GeV, the 95% C.L. is \tan\beta > 7(5) for A_0 = 0(-4m_{1/2}), and for m_h >
120 GeV, \tan\beta > 15(10). The positive sign of the a_{\mu} deviation implies
\mu > 0, eliminating the extreme cancellations in the dark matter
neutralino-proton detection cross section so that almost all the SUSY parameter
space should be accessible to future planned detectors. Most of the allowed
parts of parameter space occur in the co-annihilation region where m_0 is
strongly correlated with m_{1/2}. The lower bound on a_{\mu} then greatly
reduces the allowed parameter space. Thus using 90% C. L. bounds on a_{\mu} we
find for A_0 = 0 that \tan\beta \geq 10 and for \tan\beta \leq 40 that m_{1/2}
= (290 - 550) GeV and m_0 = (70 - 300) GeV. Then the tri-lepton signal and
other SUSY signals would be beyond the Tevatron Run II (except for the light
Higgs), only the \tilde{\tau}_1 and h and (and for part of the parameter space)
the \tilde{e}_1 will be accessible to a 500 GeV NLC, while the LHC would be
able to see the full SUSY mass spectrum.


title: The Determination of the CKM Matrix

abstract:
  A general discussion of the Cabibbo-Kobayashi-Maskawa (CKM) matrix is given
and the importance stressed of determining the matrix elements as an essential
part of understanding CP violation in and beyond the Standard Model. The status
of knowledge of the matrix elements connecting the first and second generation
quarks is reviewed. A perspective on determinations of the full CKM matrix is
presented as an introduction to the separate contributions to the panel
discussion that follows.


title: Production asymmetry of D mesons in $\gamma p$ collisions

abstract:
  We study the production asymmetry of charm versus anticharm mesons in
photon-proton interactions. We consider photon gluon fusion plus higher order
corrections in which light quarks through vector meson-proton interactions
contribute to the cross section. Non perturbative effects are included in terms
of a recombination mechanism which gives rise to a production asymmetry.


title: Scale-Independent Calculation of $\sin^2 \theta_{eff}^{lept}$

abstract:
  We present a calculation of the electroweak mixing parameter $\sin^2
\theta_{eff}^{lept}$ that incorporates known higher order effects, shares the
desirable convergence properties of the $\bar{MS}$ scheme, and has the
important theoretical advantage of being strictly independent of the
electroweak scale in finite orders of perturbation theory . We also show how
this formulation can be extended to the calculation of the W mass $M_W$. The
results provide accurate, scale-independent evaluations of these important
parameters, as functions of the Higgs boson mass $M_H$, and are compared with
previous calculations in order to analyze the scheme and scale dependence of
the electroweak corrections.


title: Next-to-leading resummed coefficient function for the shape function

abstract:
  We present a next-to-leading evaluation of the resummed coefficient function
for the shape function. The results confirm our previous leading order
analysis, namely that the coefficient function is short-distance-dominated, and
allow relating the shape function computed with a non-perturbative technique to
the physical QCD distributions.


title:
Ground and excited scalar isoscalar meson states in a U(3)xU(3) quark
  model with a glueball

abstract:
  Ground and first radially excited scalar isoscalar meson states and a scalar
glueball are described in a nonlocal U(3)xU(3) quark model. The glueball is
introduced into the effective meson Lagrangian by means of the dilaton model on
the base of the scale invariance of the meson Lagrangian. The scale invariance
breaking by current quark masses and gluon anomalies is taken into account. The
glueball anomalies turn out to be important for the description of the
glueball-quarkonia mixing. The masses of five scalar isoscalar meson states and
their strong decay widths are calculated. The state f_0(1500) is shown to be
composed mostly of the scalar glueball.


title: On a possible manifestation of f_1 trajectory in J/psi photoproduction

abstract:
  We analyze a possible manifestation of f_1-trajectory in elastic J/psi
photoproduction at high energy and large momentum transfer. Inspite of the
small contribution of f_1-trajectory in total cross sections, it becomes
significant in various spin observables. In particular, we show that the
crucial test for f_1-exchange can be made by measuring the single beam- and
double parity- and beam-target asymmetries at large momentum transfers, where a
strong deviation from the exchange of conventional Pomerons is expected. This
effect is caused by the interference of natural (Pomeron) and unnatural (f_1)
parity exchange parts of amplitude in the region where their contributions
become comparable to each other and might be interesting to observe in
forthcoming experiments, if feasible. .


title:
Nonminimal Supersymmetric Standard Model with Baryon and Lepton Number
  Violation

abstract:
  We carry out a comprehensive analysis of the nonminimal supersymmetric
standard model (NMSSM) with baryon and lepton number violation. We catalogue
the baryon and lepton number violating dimension four and five operators of the
model. We then study the renormalization group evolution and infrared stable
fixed points of the Yukawa couplings and the soft supersymmetry breaking
trilinear couplings of this model with baryon and lepton number (and R-parity)
violation involving the heaviest generations. We show analytically that in the
Yukawa sector of the NMSSM there is only one infrared stable fixed point. This
corresponds to a non-trivial fixed point for the top-, bottom-quark Yukawa
couplings and the $B$ violating coupling $\lambda_{233}''$, and a trivial one
for all other couplings. All other possible fixed points are either unphysical
or unstable in the infrared region. We also carry out an analysis of the
renormalization group equations for the soft supersymmetry breaking trilinear
couplings, and determine the corresponding fixed points for these couplings. We
then study the quasi-fixed point behaviour, both of the third generation Yukawa
couplings and the baryon number violating coupling, and those of the soft
supersymmetry breaking trilinear couplings. From the analysis of the fixed
point behaviour, we obtain upper and lower bounds on the baryon number
violating coupling $\lambda_{233}''$, as well as on the soft supersymmetry
breaking trilinear couplings. Our analysis shows that the infrared fixed point
behavior of NMSSM with baryon and lepton number violation is similar to that of
MSSM.


title:
Estimates of threshold cross section for stoponium production at e+e-
  colliders

abstract:
  We estimate the total ee to stoponium cross section near threshold for a
Coulombic potential and compare it to the Born approximation. The effect of the
beam energy spread for present and future ee colliders is discussed.


title: Rates for rapidity gap Higgs production

abstract:
  We present model-independent estimates of the signal-to-background ratio for
Higgs --> b anti-b detection in double-diffractive events at the Tevatron and
the LHC. For the missing-mass approach to be able to identify the Higgs boson,
it will be necessary to tag the b quark jets in the central region. The signal
is predicted to be very small at the Tevatron, but observable at the LHC. We
note that the double-diffractive dijet production, may serve as a unique gluon
factory. This process can be used also as a Pomeron-Pomeron luminosity monitor.


title:
Effect of Supersymmetric phases on the Direct CP Asymmetry of B -> X_d
  \gamma

abstract:
  We investigate the effect of supersymmetric CP violating phases on the
inclusive decay B\to X_d\gamma. Although such a decay contains a large
background from B\to X_s\gamma, if isolated it may exhibit sizeable CP
violation, both in the Standard Model (SM) and in the context of models beyond
the SM. With unconstrained supersymmetric CP violating phases we show that the
direct CP asymmetry (A_CP) lies in the region -40%
  \le A_CP \le 40%, where a positive asymmetry would constitute a clear signal
of physics beyond the SM. Even if a direct measurement of B\to X_d\gamma proves
too dif ficult experimentally, its asymmetry contributes non-negligibly to the
measurements of A_CP for B\to X_s\gamma, and thus should be included in future
analyses. We show t hat there may be both constructive and destructive
interference between A^d\gamma_CP and A^s\gamma_CP.


title:
Regularization and supersymmetry-restoring counterterms in
  supersymmetric QCD

abstract:
  We calculate symmetry-restoring counterterms in supersymmetric QCD at the
one-loop level. First we determine loop corrections to the supersymmetry and
gauge transformations and find counterterms in such a way that the symmetry
algebra holds at the one-loop level. Then these results are used to derive the
symmetry-restoring counterterms to all trilinear interactions. In order to
obtain unique results it is crucial to use the Slavnov-Taylor identity, which
does not only contain supersymmetric and gauge Ward identities but also
describes the symmetry algebra. In dimensional regularization this procedure
yields unique non-zero values for the counterterms. In contrast, in dimensional
reduction we find that no non-symmetric counterterms are needed, neither for
the symmetry transformations nor for the physical interactions. For the
considered cases this result constitutes a definite test of the supersymmetry
and gauge invariance of the scheme.


title: Power Law in Hadron Production

abstract:
  In high energy p+p(bar) interactions the mean multiplicity and transverse
mass spectra of neutral mesons from eta to Upsilon (m = 0.5 - 10 GeV/c^2) and
the transverse mass spectra of pions (m_T > 1 GeV/c^2) reveal a remarkable
behaviour: they follow, over more than 10 orders of magnitude, the power-law
function:The parameters C and P are energy dependent, but similar for all
mesons produced at the same collision energy. This scaling resembles that
expected in the statistical description of hadron production: the parameter P
plays the role of a temperature and the normalisation constant C is analogous
to the system volume. The fundamental difference is, however, in the form of
the distribution function. In order to reproduce the experimental results and
preserve the basic structure of the statistical approach the Boltzmann factor
e^(-E/T) appearing in standard statistical mechanics has to be substituted by a
power-law factor (E/Lambda)^(-P).


title: Regge Poles in QCD

abstract:
  Basic properties of Regge poles are reviewed.
  Regge poles are considered from both t-channel and s-channel points of view.
The main part of the review is devoted to the Regge poles in QCD. The method of
the Wilson-loop path integral is used to calculate trajectories of Regge poles
for $q-\bar q$ and gluonic states. The problem of the Pomeron in QCD is
discussed in details. It is shown how to use the 1/N-expansion for
classification of reggeon diagrams in QCD. The role of Regge cuts in reggeon
theory is discussed and their importance for high-energy phenomenology is
emphasized. Models based on the reggeon calculus, 1/N-expansion in QCD and
string picture of interactions at large distances are reviewed and are applied
to a broad class of phenomena in strong interactions. It is shown how to apply
the reggeon approach to small-x physics in deep inelastic scattering.


title: The anomalous magnetic moment of the muon and radiative lepton decays

abstract:
  The leptons are viewed as composite objects, exhibiting anomalous magnetic
moments and anomalous flavor-changing transition moments. The decay $\mu \to e
\gamma$ is expected to occur with a branching ratio of the same order as the
present experimental limit.


title:
Charginos and Neutralinos Production at 3-3-1 Supersymmetric Model in
  $e^-e^-$ Scattering

abstract:
  The goal of this article is to derive the Feynman rules involving charginos,
neutralinos, double charged gauge bosons and sleptons in a 3-3-1 supersymmetric
model. Using these Feynman rules we will calculate the production of a double
charged chargino with a neutralino and also the production of a pair of single
charged charginos, both in an electron- electron $e^-e^-$ process.


title: The Threshold Expansion of the 2-loop Sunrise Selfmass Master Amplitudes

abstract:
  The threshold behavior of the master amplitudes for two loop sunrise
self-mass graph is studied by solving the system of differential equations,
which they satisfy. The expansion at the threshold of the master amplitudes is
obtained analytically for arbitrary masses.


title:
Covariant Treatment of Neutrino Spin (Flavour) Conversion in Matter
  under the Influence of Electromagnetic Fields

abstract:
  Within the recently proposed Lorentz invariant formalism for description of
neutrino spin evolution in presence of an arbitrary electromagnetic fields
effects of matter motion and polarization are considered.


title: Radiative decays of mesons in the NJL model

abstract:
  We revisit the theoretical predictions for anomalous radiative decays of
pseudoscalar and vector mesons. Our analysis is performed in the framework of
the Nambu-Jona-Lasinio model, introducing adequate parameters to account for
the breakdown of chiral symmetry. The results are comparable with those
obtained in previous approaches.


title: Generalized Bounds on Majoron-neutrino couplings

abstract:
  We discuss limits on neutrino-Majoron couplings both from laboratory
experiments as well as from astrophysics. They apply to the simplest class of
Majoron models which covers a variety of possibilities where neutrinos acquire
mass either via a seesaw-type scheme or via radiative corrections. By adopting
a general framework including CP phases we generalize bounds obtained
previously. The combination of complementary bounds enables us to obtain a
highly non-trivial exclusion region in the parameter space. We find that the
future double beta project GENIUS, together with constraints based on supernova
energy release arguments, could restrict neutrino-Majoron couplings down to the
10^{-7} level.


title:
Pair production of neutral Higgs bosons at the CERN Large Hadron
  Collider

abstract:
  We study the hadroproduction of two neutral Higgs bosons in the minimal
supersymmetric extension of the standard model, which provides a handle on the
trilinear Higgs couplings. We include the contributions from quark-antiquark
annihilation at the tree level and those from gluon-gluon fusion, which
proceeds via quark and squark loops. We list compact results for the tree-level
partonic cross sections and the squark loop amplitudes, and we confirm previous
results for the quark loop amplitudes. We quantitatively analyze the hadronic
cross sections at the CERN Large Hadron Collider assuming a favorable
supergravity-inspired scenario.


title:
Coulomb and core/halo corrections to Bose-Einstein n-particle
  correlations

abstract:
  We report on a systematic treatment of Coulomb corrections for 3- and
n-particle (Bose-Einstein) correlations, leading to a removal of a 100 %
systematic error from earlier Coulomb corrections of 5-particle Bose-Einstein
correlations in heavy ion collisions. These results are generalized to include
strong final state interactions and core-halo effects.


title: Comment on studying the corrections to factorization in B -> D(*) X

abstract:
  We propose studying the mechanism of factorization in exclusive decays of the
form B->D(*)X by examining the differential decay rate as a function of the
invariant mass of the light hadronic state X. If factorization works primarily
due to the large N_c limit then its accuracy is not expected to decrease as the
X invariant mass increases. However, if factorization is mostly a consequence
of perturbative QCD then the corrections should grow with the X invariant mass.
Combining data for hadronic tau decays and semileptonic B decays allows tests
of factorization to be made for a variety of final states. We discuss the
examples of B->D^*\pi^+\pi^-\pi^-\pi^0 and B->D^*\omega\pi^-. The mode
B->D^*\omega\pi^- will allow a precision study of the dependence of the
corrections to factorization on the invariant mass of the light hadronic state.


title: Spontaneous Violation of Lorentz and CPT Symmetry

abstract:
  Overview of spontaneous Lorentz and CPT breaking mechanism in the context of
the standard model contributed to the proceedings for the Coral Gables meeting.


title: Model of Soft CP Violation

abstract:
  We propose a model of soft CP violation that evades the strong CP problem and
can describe observed CP violation in the neutral kaon sector, both direct and
indirect. Our model requires two ``duark'' mesons carrying quark number two
that have complex (CP-violating) bare masses and are coupled to quark pairs.
Aside from the existence of these potentially observable new particles with
masses of several hundred GeV, we predict a flat unitarity triangle ({\it
i.e.,} no observable direct CP violation in the $B$-meson sector) and a
possibly anomalous branching ratio for the decay mode $K^+\to \pi^++\bar{\nu}
\nu$.


title: Extreme-Energy Cosmic Rays: Puzzles, Models, and Maybe Neutrinos

abstract:
  The observation of twenty cosmic-ray air-showers at and above 10^{20} eV
poses fascinating problems for particle astrophysics: how the primary particles
are accelerated to these energies, how the primaries get here through the 2.7K
microwave background filling the Universe, and how the highest-energy events
exhibit clustering on few-degree angular scales on the sky when charged
particles are expected be bent by cosmic magnetic fields. An overview of the
puzzles is presented, followed by a brief discussion of many of the models
proposed to solve these puzzles. Emphasis is placed on (i) the signatures by
which cosmic ray experiments in the near future will discriminate among the
many proposed models, and (ii) the role neutrino primaries may play in
resolving the observational issues. It is an exciting prospect that
highest-energy cosmic rays may have already presented us with new physics not
accessible in terrestrial accelerator searches.


title:
Ambiguities of theoretical parameters and CP/T violation in neutrino
  factories

abstract:
  We study the optimal setup for observation of the CP asymmetry in neutrino
factory experiments --- the baseline length, the muon energy and the analysis
method. First, we point out that the statistical quantity which has been used
in previous works doesn't represent the CP asymmetry. Then we propose the more
suitable quantity, $\equiv \chi^{2}_{2} $, which is sensitive to the CP
asymmetry. We investigate the behavior of $ \chi^{2}_{2} $ with ambiguities of
the theoretical parameters. The fake CP asymmetry due to the matter effect
increases with the baseline length and hence the error in the estimation of the
fake CP asymmetry grows with the baseline length due to the ambiguities of the
theoretical parameters. Namely, we lose the sensitivity to the genuine
CP-violation effect in longer baseline.


title:
Pinching phenomenon: Central feature in out of equilibrium thermal field
  theories

abstract:
  We continue to study out of equilibrium TFT with switching on the interaction
occurring at finite time. We exploit the concept of projected function (PF) and
Wigner transform of projected function (WTPF). WTPF's are bare propagators,
one-loop self-energies, retarded and advanced components of the resummed
propagator. Among WTPF's convolution product is very simple, one does not need
gradient expansion. However, WTPF's are completely determined by their infinite
time limit and, thus, cannot be the carriers of relaxation phenomena.
Furthermore, we observe that the functions capable of carrying relaxation
phenomena (non-WTPF) emerge in the mixed ("ill-defined") products of retarded
and advanced propagators and self-energies. In particular, only non-WTPF's
contribute to time variation of equal-time Green functions (particle number,
etc.); contributions from WTPF will be constant in time. As these are generated
in mixed products, the pinching phenomenon is being promoted from an obstacle
to the central feature of out of equilibrium TFT. We analyze the pinching
phenomenon. In the case of naive pinching we reproduce known results. In
Schwinger-Dyson equations the Keldysh component of self-energy is well defined
even for multiple self-energy insertion contributions. We calaculate explicitly
single self-energy contribution to Keldysh component of propagator which
generates nontrivial time dependence. For photon production from QCD plasma
(finite-lifetime effect) our approximate analytic results agree with the
results by S. -Y. Wang and D. Boyanovsky obtained within dynamical
renormalisation group approach.


title: Four-neutrino mixing solutions of the atmospheric neutrino anomaly

abstract:
  Solutions to the atmospheric neutrino anomaly which smoothly interpolate
between nu_mu -> nu_tau and nu_mu -> nu_s oscillations are studied. It is shown
that, although the Super-Kamiokande data disfavor the pure nu_mu -> nu_s
channel, one cannot exclude sizable amplitude for the nu_mu -> nu_s channel in
addition to nu_mu -> nu_tau oscillations.


title:
Testing large mixing MSW solutions of the solar neutrino problem through
  Earth regeneration effects

abstract:
  Large mixing MSW solutions to the solar neutrino problem appear to be
currently favored by the data. We discuss the possibility of discriminating
them by means of present and future experiments. In particular, we show that
the study of energy and time dependence of the Earth regeneration effect can be
useful in this respect.


title:
Sfermion masses in Nelson-Strassler type of models: SUSY standard models
  coupled with SCFTs

abstract:
  We study soft SUSY breaking parameters in the Nelson-Strassler type of
models: SUSY standard models coupled with SCFTs. In this type of models, soft
SUSY breaking parameters including sfermion masses can be suppressed around the
decoupling scale of SCFTs. We clarify the condition to derive exponential
suppression of sfermion masses within the framework of pure SCFTs. Such
behavior is favorable for degeneracy of sfermion masses. However, the realistic
sfermion masses are not quite degenerate due to the gauge couplings and the
gaugino masses in the SM sector. We show the sfermion mass spectrum obtained in
such models. The aspect of suppression for the soft SUSY breaking parameters is
also demonstrated in an explicit model. We also give a mechanism generating the
$\mu$-term of the Electro-Weak scale by a singlet field coupled with the SCFT.


title:
The muon-positron conversion in nuclei mediated by light Majorana
  neutrinos

abstract:
  We study the lepton number violating muon-positron conversion in nuclei
mediated by the exchange of virtual light Majorana neutrinos. We found that a
previously overlooked imaginary part of this amplitude plays an important role.
The numerical calculation has been made for the experimentally interesting
muon-positron conversion in Ti48 using realistic renormalized proton-neutron
QRPA wave functions. We also discuss the very similar case of the neutrinoless
double beta decay of Ca48 The ratio of muon-positron conversion over the total
muon absorption has been computed taking into account the current constraints
from neutrino oscillation phenomenology. We compare our results with the
experimental limits as well as with previous theoretical predictions. We have
found that the Majorana neutrino mode of muon-positron conversion in Ti48 is
too small to be measurable in the foreseeable future.


title:
Longitudinal and transverse fermion-boson vertex in QED at finite
  temperature in the HTL approximation

abstract:
  We evaluate the fermion-photon vertex in QED at the one loop level in Hard
Thermal Loop approximation and write it in covariant form. The complete vertex
can be expanded in terms of 32 basis vectors. As is well known, the
fermion-photon vertex and the fermion propagator are related through a
Ward-Takahashi Identity (WTI). This relation splits the vertex into two parts:
longitudinal (Gamma_L) and transverse (Gamma_T). Gamma_L is fixed by the WTI.
The description of the longitudinal part consumes 8 of the basis vectors. The
remaining piece Gamma_T is then written in terms of 24 spin amplitudes.
Extending the work of Ball and Chiu and Kizilersu et. al., we propose a set of
basis vectors T^mu_i(P_1,P_2) at finite temperature such that each of these is
transverse to the photon four-momentum and also satisfies T^mu_i(P,P)=0, in
accordance with the Ward Identity, with their corresponding coefficients being
free of kinematic singularities. This basis reduces to the form proposed by
Kizilersu et. al. at zero temperature. We also evaluate explicitly the
coefficient of each of these vectors at the above-mentioned level of
approximation.


title: On the EDM Cancellations in D-brane models

abstract:
  We analyze the possibility of simultaneous electron, neutron, and mercury
electric dipole moment (EDM) cancellations in the mSUGRA and D--brane models.
We find that the mercury EDM constraint practically rules out the cancellation
scenario in D-brane models whereas in the context of mSUGRA it is still allowed
with some fine-tuning.


title: Saturation and Universality in QCD at small x

abstract:
  We find approximate solutions to the renormalization group equation which
governs the quantum evolution of the effective theory for the Color Glass
Condensate. This is a functional Fokker-Planck equation which generates in
particular the non-linear evolution equations previously derived by Balitsky
and Kovchegov within perturbative QCD. In the limit where the transverse
momentum of the external probe is large compared to the saturation momentum,
our approximations yield the Gaussian Ansatz for the effective action of the
McLerran-Venugopalan model. In the opposite limit, of a small external
momentum, we find that the effective theory is governed by a scale-invariant
universal action which has the correct properties to describe gluon saturation.


title: Precision Top-Quark Physics

abstract:
  I consider the measurement of the top-quark mass, the CKM matrix element
V_{tb}, and the top-quark Yukawa coupling to the Higgs boson at the Tevatron,
the LHC, and a Linear Collider. The theoretical motivations for these
measurements, as well as the experimental possibilities, are discussed.


title: Model-Independent Analysis of g_\mu-2

abstract:
  Assuming that the scale of new physics exceeds the weak scale, we have
considered all possible origins of deviations from the Standard Model in
$\gmu2$. If the underlying theory can be treated perturbatively, then to
account for an effect as large as has been recently reported\cite{BNL}, the
only possibilities would be models that contain particles that yield direct
contributions, of which SUSY models are prototypical, or models having
unexpectedly light leptoquarks or having a rather exotic heavy vector boson
that couples predominantly to muons. Other possibilities either are already
excluded by existing experimental results or would have to be unnaturally
large. If, on the contrary, the underlying new physics involves strong
interactions, as in technicolor models, then the discrepancy could be accounted
for by a variety of effective operators.


title: MKN Theory of Bound States

abstract:
  This paper derives most of the formulas in the MKN (Maung-Kahana-Norbury)
Theory of bound states which incorporates the Lande Subtraction method to
remove the singularities of the Cornell potential.


title:
Decays of the Meson $B_c$ to a $P$-Wave Charmonium State $\chi_c$ or
  $h_c$

abstract:
  The semileptonic decays,
$B_{c}{\longrightarrow}{\chi_c}(h_c)+{\ell}+{{\nu}}_{\ell}$, and the two-body
nonleptonic decays, $B_{c}{\longrightarrow}{\chi_c}(h_c)+h$, (here $\chi_c$ and
$h_c$ denote $(c\bar c[^3P_J])$ and $(c\bar c[^1P_1])$ respectively, and $h$
indicates a meson) were computed. All of the form factors appearing in the
relevant weak-current matrix elements with $B_c$ as its initial state and a
$P$-wave charmonium state as its final state for the decays were precisely
formulated in terms of two independent overlapping-integrations of the
wave-functions of $B_c$ and the $P$-wave charmonium and with proper kinematics
factors being `accompanied'. We found that the decays are quite sizable, so
they may be accessible in Run-II at Tevatron and in the foreseen future at LHC,
particularly, when BTeV and LHCB, the special detectors for B-physics, are
borne in mind. In addition, we also pointed out that the decays $B_c\to
h_c+...$ may potentially be used as a fresh window to look for the $h_c$
charmonium state, and the cascade decays, $B_c\to \chi_c[^3P_{1,2}]+l+\nu_l$
($B_c\to \chi_c[^3P_{1,2}]+h$) with one of the radiative decays
$\chi_c[^3P_{1,2}] \to J/\psi+\gamma$ being followed accordingly, may affect
the observations of $B_c$ meson through the decays $B_{c}\to
{J/\psi}+{l}+\nu_{l}$ ($B_c\to J/\psi+h$) substantially.


title:
One-loop self-energy correction to the 1s and 2s hyperfine splitting in
  H-like systems

abstract:
  The one-loop self-energy correction to the hyperfine splitting of the 1s and
2s levels in H-like low-Z atoms is evaluated to all orders in Z\alpha. The
results are compared to perturbative calculations. The residual higher-order
contribution is evaluated. Implications to the specific difference of the
hyperfine structure intervals 8\Delta \nu_2 - \Delta \nu_1 in He^+ are
investigated.


title: Unscrambling New Models for Higher-Energy Physics

abstract:
  There is strong evidence that new physical degrees of freedom and new
phenomena exist and may be revealed in future collider experiments. The best
hints of what this new physics might be are provided by electroweak symmetry
breaking. I briefly review certain theories for physics beyond the standard
model, including the top-quark seesaw model and universal extra dimensions. A
common feature of these models is the presence of vector-like quarks at the TeV
scale. Then I discuss the role of a linear $e^+e^-$ collider in disentangling
this new physics.


title:
New physics effects to the lepton polarizations in the B -> K l^+ l^-
  decay

abstract:
  Using the general, model independent form of the effective Hamiltonian, the
general expressions of the longitudinal, normal and transversal polarization
asymmetries for (l^-) and (l^+) and combinations of them for the exclusive (B
-> K l^+ l^-) decay are found. The sensitivity of lepton polarizations and
their combinations on new Wilson coefficients are studied. It is found that
there exist regions of Wilson coefficients for which the branching ratio
coincides with the Standard Model result while the lepton polarizations differ
substantially from the standard model prediction. Hence, studying lepton
polarization in these regions of new Wilson coefficients can serve as a
promising tool for establishing new physics beyond the Standard Model.


title:
Indirect Determination of the Vertex and Angles of the Unitarity
  Triangle

abstract:
  The values of the elements of the Cabibbo-Kobayashi-Maskawa matrix are
constrained by direct and indirect measurements. A fit to experimental data and
theory calculations allows the indirect determination of the vertex and angles
of the unitarity triangle as: rho = 0.18 +/- 0.07 eta = 0.35 +/- 0.05 sin
2alpha = 0.14 +0.25 -0.38 sin 2beta = 0.73 +/- 0.07 gamma = 63 +8 -11 degrees.
Information is derived on the presence of CP violation in the matrix, on
non-perturbative QCD parameters and on the Bs oscillation frequency.


title:
Effective Lagrangian for $\bar{s}bg$ and $\bar{s}b\gamma$ Vertices in
  the mSUGRA model

abstract:
  Complete expressions of the $\bar{s}bg$ and $\bar{s}b\gamma$ vertices are
derived in the framework of supersymmetry with minimal flavor violation. With
the minimal supergravity (mSUGRA) model, a numerical analysis of the
supersymmetric contributions to the Wilson Coefficients at the weak scale is
presented.


title:
The Use of Dispersion Relations in the $\pi\pi$ and $K\bar K$
  Coupled-Channel System

abstract:
  Systematic and careful studies are made on the properties of the IJ=00
$\pi\pi$ and $K\bar K$ coupled-channel system, using newly derived dispersion
relations between the phase shifts and poles and cuts. The effects of nearby
branch point singularities to the determination of the $f_0(980)$ resonance are
estimated and and discussed.


title:
On High-Energy Behavior of Cross Sections in Theories with Large Extra
  Dimensions

abstract:
  We discuss the high-energy behavior of cross sections in theories with large
extra dimensions and low-scale quantum gravity, addressing two particular
issues: (i) the tension of the D-branes, and (ii) bounds on the cross section
and their relation to approximations in the mode sum over Kaluza-Klein-graviton
exchanges.


title: Hard Thermal Photon Production in Relativistic Heavy Ion Collisions

abstract:
  The recent status of hard thermal photon production in relativistic heavy ion
collisions is reviewed and the current rates are presented with emphasis on
corrected bremsstrahlung processes in the quark-gluon plasma (QGP) and
quark-hadron duality. Employing Bjorken hydrodynamics with an EOS supporting
the phase transition from QGP to hot hadron gas (HHG), thermal photon spectra
are computed. For SPS 158 GeV Pb+Pb collisions, comparison with other
theoretical results and the WA98 direct photon data indicates significant
contributions due to prompt photons. Extrapolating the presented approach to
RHIC and LHC experiments, predictions of the thermal photon spectrum show a QGP
outshining the HHG in the high-pT-region.


title: Natural Double Inflation in Supergravity

abstract:
  We propose a natural double inflation model in supergravity. In this model,
chaotic inflation first takes place by virtue of the Nambu-Goldstone-like shift
symmetry, which guarantees the absence of the exponential factor in the
potential for the inflaton field. During chaotic inflation, an initial value of
the second inflation (new inflation) is set. In this model, the initial value
of new inflation can be adequately far from the local maximum of the potential
for new inflation due to the small linear term of the inflaton in the K\"ahler
potential. Therefore, the primordial fluctuations within the present horizon
scale may be attributed to both inflations; that is, the first chaotic
inflation produces the primordial fluctuations on the large cosmological scales
while the second new inflation on the smaller scales. The successive decay of
the inflaton for new inflation leads to a reheating temperature low enough to
avoid the overproduction of gravitinos in a wide range of the gravitino mass.


title: Gauge dependence of the on-shell renormalized mixing matrices

abstract:
  It was recently pointed out that the on-shell renormalization of the
Cabibbo-Kobayashi-Maskawa (CKM) matrix in the method by Denner and Sack causes
a gauge parameter dependence of the amplitudes. We analyze the gauge dependence
of the on-shell renormalization of the mixing matrices both for fermions and
scalars in general cases, at the one-loop level. We then show that this gauge
dependence can be avoided by fixing the counterterms for the mixing matrices in
terms of the off-diagonal wave function corrections for fermions and scalars
after a rearrangement, in a similar manner to the pinch technique for gauge
bosons. We finally present explicit calculation of the gauge dependence for two
cases: CKM matrix in the Standard Model, and left-right mixing of scalar quarks
in the minimal supersymmetric standard model.


title:
Low-energy gluon contributions to the vacuum polarization of heavy
  quarks

abstract:
  We calculate a correction to the electromagnetic current induced by a heavy
quark loop. The contribution of this correction to the vacuum polarization
function appears at the O(alpha_s^3) order of perturbation theory and has a
qualitatively new feature -- its absorptive part starts at zero energy in
contrast to other contributions where the absorptive parts start at the
two-particle threshold. Our result imposes a constraint on the order n of the
moments used in the heavy-quark sum rules, n<4.


title:
Probing the messenger of supersymmetry breaking by the muon anomalous
  magnetic moment

abstract:
  Motivated by the recently measured muon's anomalous magnetic moment
$a_{\mu}$, we examine the supersymmetry contribution to $a_{\mu}$ in various
mediation models of supersymmetry breaking which lead to predictive flavor
conserving soft parameters at high energy scale. The studied models include
dilaton/modulus-mediated models in heterotic string/$M$ theory, gauge-mediated
model, no-scale or gaugino-mediated model, and also the minimal and deflected
anomaly-mediated models. For each model, the range of $a^{SUSY}_{\mu}$ allowed
by other experimental constraints, e.g. b --> s\gamma and the collider bounds
on superparticle masses, is obtained together with the corresponding parameter
region of the model. Gauge-mediated models with low messenger scale can give
any $a^{SUSY}_{\mu}$ within the $2\sigma$ bound. In many other models, b -->
s\gamma favors $a^{SUSY}_{\mu}$ smaller than either the $-1\sigma$ value
($26\times 10^{-10}$) or the central value ($42\times 10^{-10}$).


title:
Nonequilibrium time evolution of the spectral function in quantum field
  theory

abstract:
  Transport or kinetic equations are often derived assuming a quasi-particle
(on-shell) representation of the spectral function. We investigate this
assumption using a three-loop approximation of the 2PI effective action in real
time, without a gradient expansion or on-shell approximation. For a scalar
field in 1+1 dimensions the nonlinear evolution, including the integration over
memory kernels, can be solved numerically. We find that a spectral function
approximately described by a nonzero width emerges dynamically. During the
nonequilibrium time evolution the Wigner transformed spectral function is
slowly varying, even in presence of strong qualitative changes in the effective
particle distribution. These results may be used to make further analytical
progress towards a quantum Boltzmann equation including off-shell effects and a
nonzero width.


title:
Bounds for FCNC and the Pseudoscalar Higgs mass in the General Two Higgs
  Doublet Model type III using $g-2$ muon factor

abstract:
  Current muon anomalous magnetic moment data have challenged the SM, and seems
to open a window to new Physics. Since the difference between SM and
experimental predictions is approximately $2.6\sigma$. In the framework of the
General Two Higgs Doublet Model (2HDM), we calculate the muon anomalous
magnetic moment to get lower and upper bounds for the Flavor Changing Yukawa
couplings (FC) in the leptonic sector. We also obtain lower bounds for the mass
of the Pseudoscalar Higgs ($m_{A^ 0}$, as a function of the parameters of the
model.


title: Is Neutrino a Superluminal Particle?

abstract:
  Based on the experimental discovery that the mass-square of neutrino is
negative, a quantum theory for superluminal neutrino is proposed. Two Weyl
equations coupled together via a mass term respecting the maximum parity
violation lead to a new equation which describes the superluminal motion of
neutrino with permanent helicity. Various strange features of subluminal and
superluminal particles can be ascribed to the relative variation of two
contradictory fields superposing coherently inside the particle with the change
of its speed u in the whole range ($0<u<\infty$). Being compatible with the
theory of special relativity, this theory may have various applications.


title: Oscillation Measurements with Upgraded Conventional Neutrino Beams

abstract:
  We consider the nu_mu to nu_e oscillation measurements that would be possible
at upgraded 1 GeV and multi-GeV conventional neutrino sources driven by future
megawatt-scale proton drivers. If these neutrino superbeams are used together
with detectors that are an order of magnitude larger than those presently
foreseen, we find that the sensitivity to nu_mu to nu_e oscillations can be
improved by an order of magnitude beyond the next generation of accelerator
based experiments. In addition, over a limited region of parameter space, the
neutrino mass hierarchy can be determined with a multi-GeV long baseline beam.
If the Large Mixing Angle MSW solution correctly describes the solar neutrino
deficit, there is a small corner of allowed parameter space in which maximal
CP-violation in the lepton sector might be observable at a 1 GeV medium
baseline experiment. Superbeams with massive detectors would therefore provide
a useful tool en route to a neutrino factory, which would permit a further
order of magnitude improvement in sensitivity, together with a more
comprehensive check of CP-violation and the oscillation framework.


title:
Direct Signals for Large Extra Dimensions in the Production of Fermion
  Pairs at Linear Colliders

abstract:
  We analyze the potentiality of the new generation of $e^+e^-$ linear
colliders to search for large extra dimensions via the production of fermion
pairs in association with Kaluza-Klein gravitons (G), i.e. $e^+e^- \leftarrow
f\bar{f}G$. This process leads to a final state exhibiting a significant amount
of missing energy in addition to acoplanar lepton or jet pairs. We study in
detail this reaction using full tree level contibutions due to the graviton
emission and the standard model backgrounds. After choosing the cuts to enhance
the signal, we show that a linear collider with a center-of-mass energy of 500
GeV will be able to probe quantum gravity scales from 0.96(0.86) up to 4.1(3.3)
TeV at 2(5)$\sigma$ level, depending on the number of extra dimensions.


title:
Effective supersymmetric theory and muon anomalous magnetic moment with
  R parity violation

abstract:
  The effective supersymmetric theory (ESUSY) with R parity conservation cannot
give a large anomalous magnetic moment of $\mu$. It is pointed out that the
flavor conservation and a large $(g-2)_\mu$ within the experimental limits are
achievable in the ESUSY with R parity violating couplings involving the third
generation superparticles.


title:
Constraining the Randall-Sundrum Model Using Diphoton Production at
  Hadron Colliders

abstract:
  Virtual effects of gravitons in the production of diphotons at the upgraded
Tevatron and at the LHC are analysed with the idea of probing the parameter
space of the Randall-Sundrum (RS) model. It is shown that this process yields
stringent constraints on the parameter space of the RS model. We show that data
on diphoton production from Tevatron Run II will be sensitive to a masses of
the first graviton resonance in the range of 700-1150 GeV, while at LHC the
mass range probed will be in the region of 3.5 -- 5.5 TeV.


title:
Photoproduction of Jets on a Virtual Pion Target in Next-to-Leading
  Order QCD

abstract:
  Differential cross sections for inclusive dijet photoproduction on a virtual
pion have been calculated in next-to-leading order QCD as a function of $E_T,
\eta$, and $x_{\pi}$. The cross sections are compared with recent ZEUS data on
photoproduction of dijets with a leading neutron in the final state.


title: Heavy Flavor Enhancement as a Signal of Color Deconfinement

abstract:
  We argue that the color deconfinement in heavy ion collisions may lead to
enhanced production of hadrons with open heavy flavor (charm or bottom). We
estimate the upper bound of this enhancement.


title:
Supersymmetry and Finite Radiative Electroweak Breaking from an Extra
  Dimension

abstract:
  A five dimensional N=1 supersymmetric theory compactified on the orbifold
$S^1/\mathbb{Z}_2$ is constructed. Gauge fields and $SU(2)_L$ singlets
propagate in the bulk ($U$-states) while $SU(2)_L$ doublets are localized at an
orbifold fixed point brane ($T$-states). Zero bulk modes and localized states
constitute the MSSM and massive modes are arranged into N=2 supermultiplets.
Superpotential interactions on the brane are of the type $UTT$. Supersymmetry
is broken in the bulk by a Scherk-Schwarz mechanism using the $U(1)_R$ global
$R$-symmetry. A radiative finite electroweak breaking is triggered by the
top-quark/squark multiplet $\mathbb{T}$ propagating in the bulk. The
compactification radius $R$ is fixed by the minimization conditions and
constrained to be $1/R \simlt 10-15$ TeV. It is also constrained by precision
electroweak measurements to be $1/R \simgt 4$ TeV. The pattern of
supersymmetric mass spectrum is well defined. In particular, the lightest
supersymmetric particle is the sneutrino and the next to lightest
supersymmetric particle the charged slepton, with a squared-mass difference
$\sim M_Z^2$. The theory couplings, gauge and Yukawa, remain perturbative up to
scales $E$ given, at one-loop, by $ER \simlt 30-40$. Finally, LEP searches on
the MSSM Higgs sector imply an absolute lower bound on the SM-like Higgs mass,
around 145 GeV in the one-loop approximation.


title:
The effect of vacuum polarisation on muon-proton scattering at small
  energies and angles

abstract:
  We give a compact expression for the unpolarised differential cross section
for muon-proton scattering in the one photon exchange approximation. The effect
of adding the vacuum polarisation amplitude to the no-spin-flip amplitude for
one photon exchange is calculated at small energies and scattering angles and
is found to be negligible for present experiments.


title: Monte Carlo model for nuclear collisions from SPS to LHC energies

abstract:
  A Monte Carlo model to simulate nuclear collisions in the energy range going
from SPS to LHC, is presented. The model includes in its initial stage both
soft and semihard components, which lead to the formation of color strings.
Collectivity is taken into account considering the possibility of strings in
color representations higher than triplet or antitriplet, by means of string
fusion. String breaking leads to the production of secondaries. At this point,
the model can be used as initial condition for further evolution by a transport
model. In order to tune the parameters and see the results in nucleus-nucleus
collisions, a naif model for rescattering of secondaries is introduced. Results
of the model are compared with experimental data, and predictions for RHIC and
LHC are shown.


title: Existence and Properties of the $f_0(665)$ State and Chiral Symmetry

abstract:
  On the basis of a simultaneous description of the isoscalar s-wave of
$\pi\pi$ scattering (from the threshold up to 1.9 GeV) and of $\pi\pi\to
K\bar{K}$ process (from the threshold to $\sim$ 1.4 GeV) in the
model-independent approach, it is shown that there exists the $f_0(665)$ state
with properies of the $\sigma$-meson, the glueball nature of $f_0(1500)$ is
indicated, and the $f_0(1370)$ is assigned mainly to $s{\bar s}$ state. The
coupling constants of the observed states with $\pi\pi$ and $K\bar{K}$ systems
and scattering lengths $a_0^0(\pi\pi)$ and $a_0^0(K\bar{K})$ are calculated.
The existence of the $f_0(665)$ state and the obtained $\pi\pi$-scattering
length ($a_0^0\approx 0.27 m_{\pi^+}^{-1}$) seem to suggest the linear
realization of chiral symmetry.


title: Latest Results from the Heidelberg-Moscow Double Beta Decay Experiment

abstract:
  New results for the double beta decay of 76Ge are presented. They are
extracted from Data obtained with the HEIDELBERG-MOSCOW, which operates five
enriched 76Ge detectors in an extreme low-level environment in the GRAN SASSO.
The two neutrino accompanied double beta decay is evaluated for the first time
for all five detectors with a statistical significance of 47.7 kg y resulting
in a half life of (T_(1/2))^(2nu) = [1.55 +- 0.01 (stat) (+0.19) (-0.15)
(syst)] x 10^(21) years. The lower limit on the half-life of the 0nu beta-beta
decay obtained with pulse shape analysis is (T_(1/2))^(0_nu) > 1.9 x 10^(25)
[3.1 x 10^(25)] years with 90% C.L. (68% C.L.) (with 35.5 kg y). This results
in an upper limit of the effective Majorana neutrino mass of 0.35 eV (0.27 eV).
No evidence for a Majoron emitting decay mode or for the neutrinoless mode is
observed.


title: The quark condensate from K_{e_4} decays

abstract:
  We show that, independently of the size of the quark condensate, chiral
symmetry correlates the two S-wave \pi\pi scattering lengths. In view of this
constraint, the new precision data on K_{e_4} decay allow a remarkably accurate
determination of these quantities. The result confirms the hypothesis that the
quark condensate is the leading order parameter.


title:
Implications of the muon anomalous magnetic moment and Higgs-mediated
  flavor changing neutral currents

abstract:
  In the light of the recent measurement of the muon anmalous magnetic moment
$a_\mu$ by the Muon $(g-2)$ Collaboration, we examine the contribution to
$a_\mu$ from the exchange of flavor changing scalars. Assuming that the heavier
generations have larger flavor changing couplings, we obtain a bound on $\mu -
\tau$ Yukawa coupling for a given scalar mass. Constraints on other flavor
changing/conserving couplings are also obtained from the lepton flavor
violating decays of muon and tau lepton, and bounds on the branching ratio of
$\tau \to 3 e$, $\mu \to 3 e$ and $\tau \to e \mu e$ processes are predicted.


title: Oscillating neutrinos and mu --> e, gamma

abstract:
  If neutrino masses and mixings are suitable to explain the atmospheric and
solar neutrino fluxes, this amounts to contributions to FCNC processes, in
particular mu --> e, gamma. If the theory is supersymmetric and the origin of
the masses is a see-saw mechanism, we show that the prediction for BR(mu --> e,
gamma) is in general larger than the experimental upper bound, especially if
the largest Yukawa coupling is O(1) and the solar data are explained by a large
angle MSW effect, which recent analyses suggest as the preferred scenario. Our
analysis is bottom-up and completely general, i.e. it is based just on
observable low-energy data. The work generalizes previous results of the
literature, identifying the dominant contributions. Application of the results
to scenarios with approximate top-neutrino unification, like SO(10) models,
rules out most of them unless the leptonic Yukawa matrices satisfy very precise
requirements. Other possible ways-out, like gauge mediated SUSY breaking, are
also discussed.


title: Entropy Production in Relativistic Hydrodynamics

abstract:
  The entropy production occurring in relativistic hydrodynamical systems such
as the quark-gluon plasma (QGP) formed in high-energy nuclear collisions is
explored. We study mechanisms which change the composition of the fluid, i.e.
particle production and/or chemical reactions, along with chemo- and
thermo-diffusion. These effects complement the conventional dissipative effects
of shear viscosity, bulk viscosity, and heat conductivity.


title: Muon anomalous magnetic dipole moment in supersymmetric theories

abstract:
  We study the muon anomalous magnetic dipole moment in supersymmetric
theories. The impact of the recent Brookhaven E821 experimental measurement on
both model-independent and model-dependent supersymmetric parameter spaces is
discussed in detail. We find that values of tan\beta as low as 3 can be
obtained while remaining within the E821 one-sigma bound. This requires a light
smuon; however, we show that, somewhat surprisingly, no model-independent bound
can be placed on the mass of the lightest chargino for any tan\beta greater
than or equal to 3. We also show that the maximum contributions to the
anomalous magnetic moment are insensitive to CP-violating phases. We provide
analyses of the supersymmetric contribution to the muon anomalous magnetic
moment in dilaton-dominated supergravity models and gauge-mediated
supersymmetry-breaking models. Finally, we discuss how other phenomena, such as
$B(b\to s\gamma)$, relic abundance of the lightest superpartner, and the Higgs
mass may be correlated with the anomalous magnetic moment, but do not
significantly impact the viability of a supersymmetric explanation, or the mass
limits obtainable on smuons and charginos.


title: Signatures of Non-commutative QED at Photon Colliders

abstract:
  In this paper we study non-commutative (NC) QED signatures at photon
colliders through pair production of charged leptons $(\ell^+ \ell^-)$ and
charged scalars $(H^+ H^-)$. The NC corrections for the fermion pair production
can be easily obtained since NC QED with fermions has been extensively studied
in the literature. NC QED with scalars is less studied. To obtain the cross
section for $H^+H^-$ productions, we first investigate the structure of NC QED
with scalars, and then study the corrections due to the NC geometry to the
ordinary QED cross sections. Finally by folding in the photon spectra for a
$\gamma \gamma$ collider with laser back-scattered photons from the $e^+ e^-$
machine, we obtain 95% CL lower bound on the NC scale using the above two
processes. We find that, with $\sqrt{s} = 0.5, 1.0$, and $ 1.5$ TeV and
integrated luminosity $L = 500(fb^{-1})$, the NC scale up to 0.7, 1.2, and 1.6
TeV can be probed, respectively, while, for monochromatic photon beams, these
numbers become 1.1, 1.7, 2.6 TeV, respectively.


title: Muon anomalous magnetic moment in models with singlet fermions

abstract:
  It is shown that a minimal extension of the standard model with leptons that
transform as singlets under the SU(2) symmetry of weak interactions can explain
the recently reported derivation in the measured value of the anomalous
magnetic moment of the muon from that expected in the standard model.


title: A Feynman graph selection tool in GRACE system

abstract:
  We present a Feynman graph selection tool {\tt grcsel}, which is an
interpreter written in C language. In the framework of {\tt GRACE}, it enables
us to get a subset of Feynman graphs according to given conditions.


title: Mass scales in the RS models: the $\mu$ and cosmological constant

abstract:
  There is the scale problem in the Randall-Sundrum models. Regarding this, I
review the works done with B. S. Kyae and H. M. Lee. In a supersymmetric
generalization in the RSI model, we discuss that the $\mu$ parameter can be
obtained by an intermediate scale brane. In addition, we also discuss the
cosmological constant problem with a self-tuning solution in the RSII model.


title:
Muon anomalous magnetic moment and the stabilized Randall-Sundrum
  scenario

abstract:
  We study the effects of extra dimension on the muon anomalous magnetic moment
in the stabilized Randall-Sundrum scenario. The effects of the Kaluza-Klein
states heavier than the cut-off scale expected to be of order $\Lambda_\pi$ are
neglected. Contribution from the spin-2 Kaluza-Klein states dominates over that
from the spin-0 radion. The recent BNL E821 results impose a strict constraint
on the parameter space of the model: $\Lambda_\pi \approx 0.4 - 2.1$ TeV with
$k/ M_{\rm Pl} =0.01 - 0.1$. Small $k/M_{\rm Pl}$ is preferred if $\Lambda_\pi$
is TeV scale.


title:
Open charm enhancement by secondary interactions in relativistic
  nucleus-nucleus collisions?

abstract:
  We calculate open charm production in $Pb+Pb$ reactions at SPS energies
within the HSD transport approach - which is based on string, quark, diquark
($q, \bar{q}, qq, \bar{q}\bar{q}$) and hadronic degrees of freedom - including
the production of open charm pairs from secondary 'meson'-'baryon' (or
quark-diquark and antiquark-diquark) collisions. It is argued that at collision
energies close to the $c\bar{c}$ pair threshold the dominant production
mechanism is related to the two body (or quasi two body) reactions $\pi N \to
\bar{D} (\bar{D^*}) \Lambda_c, (\Sigma_c)$. Estimates within the framework of
the Quark-Gluon String model suggest cross sections of a few $\mu b$ for $\pi N
\to \bar{D} \Lambda_c$ in the region of 1 GeV above threshold. The dynamical
transport calculations for $Pb + Pb$ at 160 A$\cdot$GeV indicate that the open
charm enhancement reported by the NA50 Collaboration might be due to such
secondary reaction mechanisms.


title: Information about the neutrino mass matrix from Double Beta Decay

abstract:
  Double beta decay is indispensable to solve the question of the neutrino mass
matrix together with neutrino oscillation experiments. The most sensitive
experiment since eight years - the Heidelberg-Moscow experiment in Gran-Sasso -
already now, with the experimental limit of < m_\nu > < 0.26 eV excludes
degenerate neutrino mass scenarios allowing neutrinos as hot dark matter in the
universe for the small angle MSW solution of the solar neutrino problem. It
probes cosmological models including hot dark matter already now on the level
of future satellite experiments MAP and PLANCK. It further probes many topics
of beyond Standard Model physics at the TeV scale. Future experiments should
give access to the multi-TeV range and complement on many ways the search for
new physics at future colliders like LHC and NLC. For neutrino physics some of
them (GENIUS) will allow to test almost all neutrino mass scenarios allowed by
the present neutrino oscillation experiments. A GENIUS Test Facility has just
been funded and will come into operation by end of 2001.


title: Axionic Domain Wall and Warped Geometry

abstract:
  We discuss how a three-brane with an associated non-factorizable (warped)
geometry can emerge from a five dimensional theory of gravity coupled to a
complex scalar field. The system possesses a discrete $Z_2$ symmetry, whose
spontaneous breaking yields an 'axionic' three-brane and a warped metric.
Analytic solutions for the wall profile and warp factor are presented. The
Kaluza-Klein decomposition and some related issues are also discussed.


title: Neutrinoless double beta decay potential in a large mixing angle world

abstract:
  We discuss the possibility of reconstructing the neutrino mass spectrum from
the complementary processes of neutrino oscillations and double beta decay in
view of the new data of Super-Kamiokande presented at the Neutrino2000
conference. Since the large mixing angle solution is favored, now, the
prospects to observe double beta decay and provide informations on the absolute
mass scale in the neutrino sector have been improved.


title: Recent Results from the HDMS Experiment

abstract:
  The status of dark matter search with the HDMS experiment is reviewed. After
one year of running the HDMS prototype detector in the Gran Sasso Underground
Laboratory, the inner crystal of the detector has been replaced with a HPGe
crystal of enriched 73Ge. The results of the operation of the HDMS prototype
detector are discussed.


title: HQET quark-gluon vertex at one loop

abstract:
  We calculate the HQET quark-gluon vertex at one loop, for arbitrary external
momenta, in an arbitrary covariant gauge and space-time dimension. Relevant
results and algorithms for the three-point HQET integrals are presented. We
also show how one can obtain the HQET limit directly from QCD results for the
quark-gluon vertex.


title:
GENIUS and the Genius TF: A New Observatory for WIMP Dark Matter and
  Neutrinoless Double Beta Decay

abstract:
  The GENIUS proposal is described and some of it's physics potential is
outlined. Also in the light of the contradictive results from the DAMA and CDMS
experiments the Genius TF, a new experimental setup is proposed. The Genius TF
could probe the DAMA evidence region using the WIMP nucleus recoil signal and
WIMP annual modulation signature simultaneously. Besides that it can prove the
long term feasibility of the detector technique to be implemented into the
GENIUS setup and will in this sense be a first step towards the realization of
the GENIUS experiment.


title: A Note on Wandzura-Wilczek Relations

abstract:
  Wandzura-Wilczek (WW) relations between matrix-elements of bilocal light-ray
operators have recently regained interest in connection with off-forward
scattering processes. Originally derived for matrix elements over leading-twist
operators, their generalization to off-forward and exclusive processes gets
complicated by the presence of higher-twist operators that are total
derivatives of leading-twist ones and do not contribute to forward-scattering.
We demonstrate that, for exclusive matrix-elements, the inclusion of these
operators into WW-relations is essential for fulfilling constraints imposed by
the conformal symmetry of massless QCD.


title:
The flavor-changing rare top decays $t\to c V V$ in topcolor-assisted
  technicolor theory

abstract:
  In the framework of topcolor-assisted technicolor (TC2) theory, we calculate
the contributions of the scalars(the neutral top-pion $\pi_{t}^{0}$ and the
top-Higgs $h_{t}^{0}$) to the flavor-changing rare top decays $t\to c V V$(V=
W, g, $\gamma$ or Z). Our results show that $h_{t}^{0}$ can enhance the
standard model $B_{r}^{SM}(t\longrightarrow cWW)$ by several orders of
magnitude for most of the parameter space. The peak of the branching ratio
resonance emerges when the top-Higgs mass is between $2m_{W}$ and $m_{t}$. The
branching ratio $ B_{r}(t\to c W W)$ can reach $ 10^{-3}$ in the narrow range.


title: Status of the HDMS experiment, the GENIUS project and the GENIUS-TF

abstract:
  The status of dark matter search in Heidelberg is reviewed. After one year of
running the HDMS prototype experiment in the Gran Sasso Underground Laboratory,
the inner crystal of the detector has been replaced with a HPGe crystal of
enriched 73Ge. The results of the operation of the HDMS prototype detector are
discussed. In the light of the contradictive results from the CDMS and DAMA
experiments the GENIUS-TF, a new experimental setup is proposed. The GENIUS-TF
could probe the DAMA evidence region using the WIMP nucleus recoil signal and
WIMP annual modulation signature simulataneously. Besides that it can prove
some key parameters of the detector technique, to be implemented into the
GENIUS setup and will in this sense be a first step towards the realization of
the GENIUS experiment.


title: Scalar scenarios contributing to (g-2)_mu with enhanced Yukawa couplings

abstract:
  In this work we address contributions from scalars to (g-2)_\mu. In order to
explain the recently measured deviation by the BNL experiment on (g-2)_\mu, it
is necessary that these scalars are either light or couple strongly with muons.
Here we explore this last possibility. We show that a scalar with mass of the
order of 10^2 GeV provides significant contribution to (g-2)_\mu if the Yukawa
coupling is about 10^{-1}. We suggest scenarios where this comes about
naturally.


title: Topcolor assisted technicolor models and muon anomalous magnetic moment

abstract:
  We discuss and estimate the contributions of the new particles predicted by
topcolor assisted technicolor(TC2) models to the muon anomalous magnetic moment
$a_{\mu}$. Our results show that the contributions of Pseudo Goldstone bosons
are very small which can be safely ignored. The main contributions come from
the ETC gauge boson $x_{\mu}$ and topcolor gauge boson $Z^{\prime}$. If we
demand that the mass of $Z^{\prime}$ is consistent with other experimental
constrains, its contributions are smaller than that of $x_{\mu}$. With
reasonable values of the parameters in TC2 models, the observed BNL results for
$a_{\mu}$ could be explained.


title: Bounds on the Tau Magnetic Moments: Standard Model and Beyond

abstract:
  We obtain new bounds for the magnetic dipole moments of the tau lepton. These
limits on the magnetic couplings of the tau to the electroweak gauge bosons
(gamma, W, Z) are set in a model independent way using the most general
effective Lagrangian with the SU(2)_L x U(1)_Y symmetry. Comparison with data
from the most precise experiments at high energies shows that the present
limits are more stringent than the previous published ones. For the anomalous
magnetic moment the bounds are, for the first time, within one order of
magnitude of the standard model prediction.


title: Dynamical Symmetry Breaking in Warped Compactifications

abstract:
  We study dynamical electroweak symmetry breaking in the Randall-Sundrum
scenario. We show that one extra dimension is enough to give the correct
pattern of electroweak symmetry breaking in a simple model with gauge bosons
and the right-handed top quark in the bulk. The top quark mass is also in
agreement with experiment. Furthermore, we propose an extended scenario with
all Standard Model gauge bosons and fermions propagating in the bulk, which
naturally accommodates the fermion mass hierarchies. No new fields or
interactions beyond the observed in the Standard Model are required.