title: Hyperon polarization in e^-p --> e^-HK with polarized electron beams

abstract:
  We apply the picture proposed in a recent Letter for transverse hyperon
polarization in unpolarized hadron-hadron collisions to the exclusive process
e^-p --> e^-HK such as e^-p-->e^-\Lambda K^+, e^-p --> e^-\Sigma^+ K^0, or
e^-p--> e^-\Sigma^0 K^+, or the similar process e^-p\to e^-n\pi^+ with
longitudinally polarized electron beams. We present the predictions for the
longitudinal polarizations of the hyperons or neutron in these reactions, which
can be used as further tests of the picture.


title:
Hyperon polarization in \nu_\mu charged current interaction at the NOMAD
  energies

abstract:
  We show that, in $\nu_\mu N\to \mu^-\Lambda X$ at the NOMAD energies, it is
impossible to separate the products of the fragmentation of the struck quark
from those of the nucleon remnant. The latter has a large contribution even in
the current fragmentation region and has to be taken into account in
calculating $\Lambda$ polarization using different pictures. Based on this, we
make a rough estimation for the longitudinal $\Lambda$ polarization in
$\nu_{\mu} N \to \mu^- \Lambda X$ at the NOMAD energies. A comparison with the
data is given and predictions for $\nu_\mu N\to\mu^-\Sigma^+X$ are presented.


title: Neutrino Oscillations. Theory and Experiment

abstract:
  The theoretical schemes on neutrino oscillations are considered. The
experimental data on neutrino oscillations from Super-Kamiokande (Japan) and
SNO (Kanada) are given. Comparison of these data with theoretical schemes is
done. Conclusion is made that the experimental data have confirmed the scheme
only with transitions (oscillations) between aromatic $\nu_e, \nu_\mu,
\nu_\tau$ neutrinos with maximal mixing angles.


title: Electric Polarizability of Mesons in Semirelativistic Quark Models

abstract:
  The electric polarizability of mesons, in particular, that of the charged
pion, is studied in the framework of a semirelativistic description of hadrons
as bound states of valence quarks in terms of a Hamiltonian composed of the
relativistic kinetic energy as well as a phenomenological potential describing
the strong interactions between the quarks. The quark-core contribution to the
electric polarizability obtainable in quark models of this kind turns out to be
in the semirelativistic approaches even smaller than in the nonrelativistic
limit.


title: Uncertainties and Discovery Potential in Planned Experiments

abstract:
  We describe a method for estimation of the discovery potential on new physics
in planned experiments. The effective significance of signal for given
probability of observation is proposed for planned experiments instead of the
usual significances S_1 = n_s/sqrt{n_b} and S_2 = n_s/sqrt{n_s+n_b}, where n_s
and n_b are the average numbers of signal and background events. Application of
the test of equal-probability allows to estimate the exclusion limits on new
physics. We also estimate the influence of systematic uncertainty related to
nonexact knowledge of signal and background cross sections on the discovery
probability of new physics in planned experiments. An account of such
systematics is very essential in the search for supersymmetry at LHC.


title: Multiple lepton pair production in relativistic ion collisions

abstract:
  We apply the Sudakov technique to description of the multiple production of
lepton pairs in peripheral collisions of ultrarelativistic heavy ions. For
heavy ions with $Z_1\alpha\sim Z_2\alpha\ll 1$ one needs a careful treatment of
the multiple Coulomb exchange between colliding ions and screening effects,
whereas interaction of real or virtual lepton pairs with colliding ions can be
neglected. We demonstrate that while the inclusive spectra are modified by
multiple Coulomb exchange between the colliding ions, the Coulomb corrections
to the momentum integrated multiplicity distributions do vanish. After
transformation to the impact parameter representation the probability of $n$
lepton pair production is shown to obey the Poisson distribution. The relevant
cross section is obtained.


title:
K-matrix analysis of the (IJ^{PC}=00^{++})-wave in the mass region below
  1900 MeV

abstract:
  We present the results of the current analysis of the partial wave
IJ^{PC}=00^{++} based on the available data for meson spectra (pi-pi, K\bar K,
eta-eta, eta-eta', pi-pi-pi-pi). In the framework of the K-matrix approach, the
analytical amplitude has been restored in the mass region 280 MeV< \sqrt s
<1900 MeV. The following scalar-isoscalar states are seen: comparatively narrow
resonances f_0(980), f_0(1300), f_0(1500), f_0(1750) and the broad state
f_0(1200-1600). The positions of the amplitude poles (masses and total widths
of the resonances) are determined as well as pole residues (partial widths to
meson channels pi-pi, K\bar K, eta-eta, eta-eta', pi-pi-pi-pi). The fitted
amplitude gives us the positions of the K-matrix poles (bare states) and the
values of bare-state couplings to meson channels thus allowing the
quark-antiquark nonet classification of bare states. On the basis of the
obtained partial widths to the channels pi-pi, K\bar K, eta-eta, eta-eta', we
estimate the quark/gluonium content of f_0(980), f_0(1300), f_0(1500),
f_0(1750), f_0(1200-1600). For f_0(980), f_0(1300), f_0(1500) and f_0(1750),
their partial widths testify the q\bar q origin of these mesons though being
unable to provide precise evaluation of the possible admixture of the gluonium
component in these resonances. The ratios of the decay coupling constants for
the f_0(1200-1600) support the idea about gluonium nature of this broad state.


title: Strangeness production in a constituent quark model

abstract:
  We develop a model to calculate strangeness production in both elementary and
heavy ion collisions, within the framework of a statistical approach to
hadronisation. Calculations are based on the canonical partition function of
the thermal Nambu-Jona-Lasinio model with exact conservation of flavor and
color. It turns out that the growth of strange quarks production in heavy ion
collisions is due to the initial excess of non-strange matter over antimatter,
whereas a suppression occurs for elementary collisions, owing to the constraint
of exact quantum charges conservation over small volumes.


title: Two-photon partial widths of tensor mesons

abstract:
  We calculate partial widths of the gamma-gamma decay of the tensor q\bar q
states a_2(1320), f_2(1270), f_2(1525), their radial excitations a_2(1660),
f_2(1640), f_2(1800) as well as ^3F_2 q\bar q states. Calculations are
performed in the framework of the same approach which was used before for the
study of radiative decays f_0(980) -> gamma-gamma, a_0(980) -> gamma-gamma and
phi(1020) -> gamma-f_0(980): the assumption made is that of q\bar q structure
of f_0(980) and a_0(980) [A.V. Anisovich et al., Phys. Lett. B 456, 80 (1999);
Eur. Phys. J. A 12, 103 (2001)]. The description of the decay partial widths
for a_2(1320), f_2(1270), f_2(1525) and f_0(980), a_0(980) is reached with the
approximately equal radial wave functions, thus giving a strong argument in
favour of the fact that these scalar and tensor mesons are to be classified as
members of the same P-wave q\bar q multiplet.


title: Process 3 -> 3 and crossing symmetry violation

abstract:
  Using the Sudakov technique we sum the perturbation series for the process
$3\to 3$ and obtain the compact analytical expression for the amplitude of this
process, which takes into account all possible Coulomb interactions between
colliding particles. Compare it with the amplitude of the lepton pair
production in heavy ion collision i.e. in the process $ 2\to 4$, we show that
crossing symmetry between this processes holds only if one neglects the
interaction of produced pair with ions (i.e. in the approximation
$Z_{1,2}\alpha \ll 1$).


title:
The Z--> l^+ l^- and W--> nu_l l^+ decays in the noncommutative standard
  model}}

abstract:
  We study Z--> l^+ l^- and W--> nu_l l^+ decays in the standard model
including the noncommutative effects. We observe that these effects appear in
the flavor dependent part of the decay widths of the processes under
consideration and therefore, they are more effective for the heavy lepton
decays.


title:
Influence of CP and CPT on production and decay of Dirac and Majorana
  fermions

abstract:
  The consequences of CP and CPT invariance for production and subsequent decay
of Dirac and Majorana fermions in polarized fermion--antifermion annihilation
are analytically studied. We derive general symmetry relations for the
production spin density matrix and for the three--particle decay matrices and
obtain constraints for the polarization and the spin--spin correlations of
Dirac and Majorana fermions. We prove that only for Majorana fermions the
energy and opening angle distribution factorizes exactly into contributions
from production and decay if CP is conserved.


title: Transport coefficients and ladder summation in hot gauge theories

abstract:
  We show how to compute transport coefficients in gauge theories by
considering the expansion of the Kubo formulas in terms of ladder diagrams in
the imaginary time formalism. All summations over Matsubara frequencies are
performed and the analytical continuation to get the retarded correlators is
done. As an illustration of the procedure, we present a derivation of the
transport equation for the shear viscosity in the scalar theory. Assuming the
Hard Thermal Loop approximation for the screening of distant collisions of the
hard particles in the plasma, we derive a couple of integral equations for the
effective vertices which, to logarithmic accuracy, are shown to be identical to
the linearized Boltzmann equations previously found by Arnold, Moore and Yaffe.


title: Seesaw mechanism, baryon asymmetry and neutrinoless double beta decay

abstract:
  A simplified but very instructive analysis of the seesaw mechanism is here
performed. Assuming a nearly diagonal Dirac neutrino mass matrix, we study the
forms of the Majorana mass matrix of right-handed neutrinos, which reproduce
the effective mass matrix of left-handed neutrinos. As a further step, the
important effect of a non diagonal Dirac neutrino mass matrix is explored. The
corresponding implications for the baryogenesis via leptogenesis and for the
neutrinoless double beta decay are reviewed. We propose two distinct models
where the baryon asymmetry is enhanced.


title:
Some Remarks to the Standard Model of Electroweak Interactions. Absence
  of Polarization i.e. Charge Renormalization and Mass Generations

abstract:
  In the article considers some remarks to the standard approach to weak
interactions. Higgs mechanism contains contradictions, therefore cannot be
considered as a realistic mechanism for mass generations. The couple constant
of the weak interactions cannot be changed in dependence on momenta transfer
(it leads to violation of the law of energy-momenta conversation), i.e. it must
be constant. It means that there are no charge vacuum polarizations or
renormalization of the couple constant of the weak interactions. Then it is
clear that the resonance enhancement of neutrino oscillations in matter cannot
exist either for absence of matter polarizations. Masses are not generated and
connected states cannot form in these interactions either since $P$-parity is
violated. Then also as in the strong and electromagnetic interactions, in the
weak interactions we can use the perturbative theory but in this case the
propagators must be the propagators of free particles without renormalization.


title:
Positivity bounds on generalized parton distributions in impact
  parameter representation

abstract:
  New positivity bounds are derived for generalized (off-forward) parton
distributions using the impact parameter representation. These inequalities are
stable under the evolution to higher normalization points. The full set of
inequalities is infinite. Several particular cases are considered explicitly.


title: On the mass, width and coupling constants of the f0(980)

abstract:
  Using the pole approach we determine the mass and width of the $f_0(980)$; in
particular, we analyze the possibility that two nearby poles are associated to
it. We restrict our analysis to a neighborhood of the resonance, using $\pi\pi$
data for the phase shift and inelasticity, and the invariant mass spectrum of
the $J/\psi\to\phi\pi\pi, \phi K\bar K$ decays. The formalism we use is based
on unitarity and a generalized version of the Breit-Wigner parameterization. We
find that a single pole describes the $f_0(980)$, the precise position
depending upon the $\pi\pi$ data used. As a byproduct, values for the
$g_{f_0\pi\pi}$ and $g_{f_0K\bar K}$ coupling constants are obtained.


title:
Scalar f0(980) and sigma(500) meson exchange in phi decays into
  pi0pi0gamma

abstract:
  The complementarity between Chiral Perturbation Theory and the Linear Sigma
Model is exploited to study $\pi^0\pi^0$ production in $\phi$ radiative decays,
where the effects of the $f_0(980)$ scalar resonance, and those of its more
controversial $\sigma(500)$ partner, should become manifest via the $\phi\to
K^+ K^- (\gamma)\to\pi^0\pi^0\gamma $ decay chain. The recently reported data
on $\phi\to\pi^0\pi^0\gamma$ coming from the VEPP-2M $e^+ e^-$ collider in
Novosibirsk and the DA$\Phi$NE $\phi$-factory in Frascati can be reasonably
described in our approach, which we propose as a promising first step towards
more detailed analyses. The $f_0(980)$ contribution, which appears as a
moderately narrow peak at the high part of the dipion mass spectrum, can be
interpreted as the isoscalar member of the scalar nonet with a large $f_0
K\bar{K}$ coupling and an $f_0\pi\pi$ coupling suppressed by almost ideal
$\sigma$-$f_0$ mixing. Indeed, the mixing angle in the flavour basis is found
to be $\phi_{S}\approx -6^\circ$, if the $f_0$-propagator is approximated by a
simple Breit-Wigner, or $\phi_{S}\approx -9^\circ$, if an improved two-channel
analysis is performed. The $\sigma(500)$ resonance, which is then strongly
coupled to pion pairs, yields a tiny contribution because, in our approach, its
coupling to kaon pairs is proportional to $m^2_\sigma-m^2_K$ and thus quite
small.


title: Strange quark production in a statistical effective model

abstract:
  An effective model with constituent quarks as fundamental degrees of freedom
is used to predict the relative strangeness production pattern in both high
energy elementary and heavy ion collisions. The basic picture is that of the
statistical hadronization model, with hadronizing color-singlet clusters
assumed to be at full chemical equilibrium at constituent quark level. Thus, by
assuming that at least the ratio between strange and non-strange constituent
quarks survives in the final hadrons, the apparent undersaturation of strange
particle phase space observed in the data can be accounted for. In this
framework, the enhancement of relative strangeness production in heavy ion
collisions in comparison with elementary collisions is mainly owing to the
excess of initial non-strange matter over antimatter and the so-called
canonical suppression, namely the constraint of exact color and flavor
conservation over small volumes.


title: Complete gluon bremsstrahlung corrections to the process b -> s l+ l-

abstract:
  In a recent paper, we presented the calculation of the order (alpha_s)
virtual corrections to b->s l+ l- and of those bremsstrahlung terms which are
needed to cancel the infrared divergences. In the present paper we work out the
remaining order(alpha_s) bremsstrahlung corrections to b->s l+ l- which do not
suffer from infrared and collinear singularities. These new contributions turn
out to be small numerically. In addition, we also investigate the impact of the
definition of the charm quark mass on the numerical results.


title: Radiative Corrections to Kaluza-Klein Masses

abstract:
  Extra-dimensional theories contain a number of almost degenerate states at
each Kaluza-Klein level. If extra dimensional momentum is at least
approximately conserved then the phenomenology of such nearly degenerate states
depends crucially on the mass splittings between KK modes. We calculate the
complete one-loop radiative corrections to KK masses in general 5 and 6
dimensional theories. We apply our formulae to the example of universal extra
dimensions and show that the radiative corrections are essential to any
meaningful study of the phenomenology. Our calculations demonstrate that
Feynman diagrams with loops wrapping the extra dimensions are well-defined and
cut-off independent even though higher dimensional theories are not
renormalizable.


title: Photon and Gluon Emission in Relativistic Plasmas

abstract:
  We recently derived, using diagrammatic methods, the leading-order hard
photon emission rate in ultra-relativistic plasmas. This requires a correct
treatment of multiple scattering effects which limit the coherence length of
emitted radiation (the Landau-Pomeranchuk-Migdal effect). In this paper, we
provide a more physical derivation of this result, and extend the treatment to
the case of gluon radiation.


title: Principle of Balance and the Sea Content of the Proton

abstract:
  In this study, the proton is taken as an ensemble of quark-gluon Fock states.
Using the principle of balance that every Fock state should be balanced with
all of the nearby Fock states (denoted as the balance model), instead of the
principle of detailed balance that any two nearby Fock states should be
balanced with each other (denoted as the detailed balance model), the
probabilities of finding every Fock state of the proton are obtained. The
balance model can be taken as a revised version of the detailed balance model,
which can give an excellent description of the light flavor sea asymmetry
(i.e., $\bar{u}\not= \bar{d}$) without any parameter. In case of
$g\Leftrightarrow gg$ sub-processes not considered, the balance model and the
detailed balance model give the same results. In case of $g\Leftrightarrow gg$
sub-processes considered, there is about 10 percent difference between the
results of these models. We also calculate the strange content of the proton
using the balance model under the equal probability assumption.


title:
The Standard Model hierarchy, fine-tuning, and negativity of the Higgs
  mass squared

abstract:
  I discuss standard motivation for the new physics at the 1 TeV scale.
Although the arguments for new exotic phenomena seem to be very supportive I
argue that the Standard Model still might offer a good description far beyond
this energy scale. I analyze three Standard Model cases with specific boundary
conditions at the lowest energies. These conditions essentially eliminate the
hierarchy and fine-tuning problems. In the first model where quartic scalar
interactions are required to decouple, the Higgs is predicted to weigh around
39 GeV. In the second model with composite Higgs, the top Yukawa coupling is
required to be one (by hand, i.e. reflecting the assumed ground state) and the
Higgs mass of about 138 GeV is favored. The third model has condensation
mechanism embedded in two dimensions. The top Yukawa coupling being one comes
about as prediction rather then requirement, i.e. $g_t={3g_2 \over
2}\sqrt{1+{1\over3}(g_1\over g_2)^2} (1-\textit{few}%)\approx 1.025
(1-\textit{few}%)$ where $g_2$, $g_1$ are electroweak $SU(2)\times U(1)$ gauge
couplings, and the SM Higgs is expected to weigh in between 114.8 and 118.6
GeV.


title:
$B \to \pi^+ \pi^-, K \pi, K \etap$ decays and new physics effects in
  the general two-Higgs-doublet model: an update

abstract:
  In this paper, we reexamine the new physics contributions to seven well
measured $B \to PP$ decays in the standard model (SM) and the general
two-Higgs-doublet model (model III) and compare the theoretical predictions
with the new data. Within the considered parameter space we found that: (a) the
measurements of the branching ratios for $B\to \pi^+ \pi^-, K^- \pi^+$ and $K^0
\pi^+$ lead to a strong constraint on the form factor $F_0^{B\pi}(0)$:
$F_0^{B\pi}(0)=0.24 \pm 0.03$; (b) the new physics enhancements to the
penguin-dominated $B \to K \pi$ and $K \etap$ decays are significant in size,
$\sim (40-65)%$ $w.r.t$ the SM predictions, and play an important role in
restoring the consistency between the data and the theory.


title:
Nonperturbative infrared multiplicative renormalizability of
  two-dimensional covariant gauge QCD

abstract:
  A nonperturbative approach to two-dimensional covariant gauge QCD is
presented in the context of the Schwinger-Dyson equations and the corresponding
Slavnov-Taylor identities. The distribution theory, complemented by the
dimensional regularization method, is used in order to treat correctly the
infrared singularities which inevitably appear in the theory. By working out
the multiplicative renormalization program we remove them from the theory on a
general ground and in a self-consistent way, proving thus the infrared
multiplicative renormalizability of two-dimensional QCD within our approach. We
also show explicitly how to formulate the bound-state problem and the
Schwinger-Dyson equations for the gluon propagator and the triple gauge field
proper vertex, all free from the infrared singularities.


title:
Light bottom squark and gluino confront electroweak precision
  measurements

abstract:
  We address the compatibility of a light sbottom (mass $2\sim 5.5 \gev$) and a
light gluino (mass $12\sim 16 \gev$) with electroweak precision measurements.
Such light particles have been suggested to explain the observed excess in the
$b$ quark production cross section at the Tevatron. The electroweak observables
may be affected by the sbottom and gluino through the SUSY-QCD corrections to
the $Zbb$ vertex. We examine, in addition to the SUSY-QCD corrections, the
electroweak corrections to the gauge boson propagators from the stop which are
allowed to be light from the SU(2)$_L$ symmetry. We find that this scenario is
strongly disfavored from electroweak precision measurements unless the heavier
sbottom mass eigenstate is lighter than $180\gev$ and the left-right mixing in
the stop sector is sufficiently large. This implies that one of the stops
should be lighter than about $98\gev$.


title:
Phenomenology of Minimal Supergravity with Vanishing A and B Soft
  Supersymmetry-Breaking Parameters

abstract:
  The ansatz of vanishing A and B parameters eliminates CP violating complex
phases in soft supersymmetry-breaking parameters of the minimal supersymmetric
standard model, and thus provides a simple solution to the supersymmetry CP
problem. Phenomenological implications of this ansatz are investigated in the
framework of minimal supergravity. We show that electroweak symmetry breakdown
occurs, predicting relatively large \tan \beta. The ansatz survives the Higgs
mass bound as well as the b \to s \gamma constraint if the universal gaugino
mass is larger than 300 GeV. We also find that the supersymmetric contribution
to the anomalous magnetic moment of muon lies in an experimentally interesting
region of order 10^{-9} in a large portion of the parameter space.


title: Renormalization of the Minimal Supersymmetric Standard Model

abstract:
  The renormalization of the Minimal Supersymmetric Standard Model of
electroweak interactions is presented to all orders of perturbation theory
using the algebraic method. Special attention is directed to the issues of soft
supersymmetry breaking, gauge fixing, and infrared finiteness. We discuss the
implications of $\hbar$-dependent field parametrizations on the counterterm
structure and provide a complete set of on-shell normalization conditions.


title: Telling three from four neutrino scenarios

abstract:
  In this talk I will consider the possibility of distinguish the usual three
neutrino model from scenarios in which a light sterile neutrino is also
present. I will show that the confusion with the so-called 3+1 scheme can arise
in some particular region of the parameter space whereas it is essentially
absent for the 2+2 scheme.
  Then I will discuss the ambiguities in the determination of the CP-violating
phase $\delta$.


title: Superbeams versus Neutrino Factories

abstract:
  We compare the physics potential of planned superbeams with the one of
neutrino factories. Therefore, the experimental setups as well as the most
relevant uncertainties and errors are considered on the same footing as much as
possible. We use an improved analysis including the full parameter
correlations, as well as statistical, systematical, and degeneracy errors.
Especially, degeneracies have so far not been taken into account in a numerical
analysis. We furthermore include external input, such as improved knowledge of
the solar oscillation parameters from the KamLAND experiment. This allows us to
determine the limiting uncertainties in all cases. For a specific comparison,
we choose two representatives of each class: For the superbeam, we take the
first conceivable setup, namely the JHF to SuperKamiokande experiment, as well
as, on a longer time scale, the JHF to HyperKamiokande experiment. For the
neutrino factory, we choose an initially conceivable setup and an advanced
machine. We determine the potential to measure the small mixing angle sin^2 2
theta_{13}, the sign of Delta m^2_{31}, and the leptonic CP phase $\deltacp$,
which also implies that we compare the limitations of the different setups. We
find interesting results, such as the complete loss of the sensitivity to the
sign of Delta m^2_{31} due to degeneracies in many cases.


title: Vector Condensation at Large Chemical Potential

abstract:
  We discuss the condensation of relativistic spin-one fields at high chemical
potential. This phenomenon leads to the spontaneous breaking of rotational
invariance, together with the breaking of internal symmetries.


title:
Associated production of sfermions and gauginos at high-energy e+e-
  colliders: the case of selectrons and electronic sneutrinos

abstract:
  We analyze the associated production at future high--energy $e^+e^-$
colliders, of first generation sleptons with neutralinos and charginos in the
modes $e^+ e^-$ and $e \gamma$, in the framework of the Minimal Supersymmetric
extension of the Standard Model. We show that the production rates, in
particular for associated production of right--handed selectrons and the
lightest neutralino which in general is the first accessible kinematically, can
be much larger than the corresponding ones for second and third generation
scalar leptons and for scalar quarks. With the high--luminosities expected at
these colliders, the detection of first generation sleptons with masses
significantly above the kinematical two--body threshold, $\sqrt{s}=
2m_{\tilde{l}}$, is thus possible in favourable regions of the parameter space.


title:
Relativistic dissipative hydrodynamics with spontaneous symmetry
  breaking

abstract:
  In this paper we consider dissipative hydrodynamic equations for systems with
continuous broken symmetries. We first present the case of superfluidity, in
which the symmetry U(1) is broken and then generalize to the chiral symmetry
$SU(2)_L \times SU(2)_R$. The corresponding new transport coefficients are
introduced.


title:
$\rho$ Polarization and `Model Independent' Extraction of
  $|V_{ub}|/|V_{cd}|$ from $D\to\rho\ell\nu$ and $B\to\rho\ell\nu$

abstract:
  We briefly discuss the predictions of the heavy quark effective theory for
the semileptonic decays of a heavy pseudoscalar to a light one, or to a light
vector meson. We point out that measurement of combinations of differential
helicity decay rates at Cleo-c and the $B$ factories can provide a model
independent means of extracting the ratio
  $|V_{ub}|/|V_{cd}|$. We briefly discuss the corrections to this prediction.


title: On astrophysical solution to ultra high energy cosmic rays

abstract:
  We argue that an astrophysical solution to UHECR problem is viable. The
pectral features of extragalactic protons interacting with CMB are calculated
in model-independent way. Using the power-law generation spectrum $\propto
E^{-\gamma_g}$ as the only assumption, we analyze four features of the proton
spectrum: the GZK cutoff, dip, bump and the second dip. We found the dip,
induced by electron-positron production on CMB, as the most robust feature,
existing in energy range $1\times 10^{18} - 4\times 10^{19}$ eV. Its shape is
stable relative to various phenomena included in calculations. The dip is well
confirmed by observations of AGASA, HiRes, Fly's Eye and Yakutsk detectors. The
best fit is reached at $\gamma_g =2.7$, with the allowed range 2.55 - 2.75. The
dip is used for energy calibration of the detectors. After the energy
calibration the fluxes and spectra of all three detectors agree perfectly, with
discrepancy between AGASA and HiRes at $E> 1\times 10^{20}$ eV being not
statistically significant. The agreement of the dip with observations should be
considered as confirmation of UHE proton interaction with CMB. The dip has two
flattenings. The high energy flattening at $E \approx 1\times 10^{19}$ eV
automatically explains ankle. The low-energy flattening at $E \approx 1\times
10^{18}$ eV provides the transition to galactic cosmic rays. This transition is
studied quantitatively. The UHECR sources, AGN and GRBs, are studied in a
model-dependent way, and acceleration is discussed. Based on the agreement of
the dip with existing data, we make the robust prediction for the spectrum at
$1\times 10^{18} - 1\times 10^{20}$ eV to be measured in the nearest future by
Auger detector.


title: Exceptional Coset Spaces and Unification in Six Dimensions

abstract:
  The coset spaces E$_8$/SO(10)$\times$H$_F$ allow complex structures which can
account for three quark-lepton generations including right-handed neutrinos. We
show that in the context of supersymmetric SO(10) gauge theories in 6
dimensions they also provide the Higgs fields which are needed to break the
electroweak and ${B-L}$ gauge symmetries, and to generate small neutrino masses
via the seesaw mechanism.


title: Electric Dipole Moments in The Limit of Heavy Superpartners

abstract:
  Supersymmetric loop corrections induce potentially large CP-violating
couplings of the Higgs bosons to nucleons and electrons that do not vanish in
the limit of heavy superpartners. The Higgs-mediated CP-odd four-fermion
operators are enhanced by tan^3 beta and induce electric dipole moments of
heavy atoms which exceed the current experimental bounds for the electroweak
scale Higgs masses and tan beta > 10. If only the first two sfermion
generations are heavy, the Higgs-mediated contributions typically dominate over
the Barr-Zee type two-loop diagrams at tan beta > 30.


title:
Constructing the large mixing angle MNS matrix in see-saw models with
  right-handed neutrino dominance

abstract:
  Recent SNO results strongly favour the large mixing angle (LMA) MSW solar
solution. We argue that there are only two technically natural low energy
neutrino mass matrix structures consistent with the LMA MSW solution,
corresponding to either a hierarchy or an inverted hierarchy with pseudo-Dirac
neutrinos. We first present a model-independent analysis in which we
diagonalise each of these two mass matrix structures to leading order in
$\theta_{13}$ and extract the neutrino masses, mixing angles and phases. In
this analysis we express the MNS matrix to leading order in the small angle
$\theta_{13}$ including the neutrino {\em and} charged lepton mixing angles and
phases, the latter playing a crucial r\^{o}le for allowing the inverted
hierarchy case to be consistent with the LMA MSW solution. We then consider the
see-saw mechanism with right-handed neutrino dominance and show how the
successful neutrino mass matrix structures may be constructed with no tuning
and with small radiative corrections, leading to a full, partial or inverted
neutrino mass hierarchy. In each case we derive approximate analytic relations
between the input see-saw parameters and the resulting neutrino masses, mixing
angles and phases, which will provide a useful guide for unified model
building. For the hierarchical cases the LMA MSW solution gives a soft lower
bound $|U_{e3}|\simgt 0.1$, just below the current CHOOZ limit. Both
hierarchical and inverted hierarchical cases predict small $\beta \beta_{0\nu}$
with $|m_{ee}|\sim 0.01$ eV within the sensitivity of future proposals such as
GENIUS. Successful leptogenesis is possible if the dominant right-handed
neutrino is the heaviest one, but the leptogenesis phase is unrelated to the
MNS phases.


title: Elliptic flow of colored glass in high energy heavy ion collisions

abstract:
  We compute the elliptic flow generated by classical gluon fields in a high
energy nuclear collision. The classical gluon fields are described by a typical
momentum scale, the saturation scale Lambda_s, which is, for RHIC energies, of
the order of 1-2 GeV. A significant elliptic flow is generated only over time
scales on the order of the system size R. The flow is dominated by soft modes
$p_{T} \sim Lambda_s / 4$ which linearize at very late times $tau \sim R \gg
1/Lambda_s$. We discuss the implications of our result for the theoretical
interpretation of the RHIC data.


title: Reply to 'Comment on "Relativistic shape invariant potentials"'

abstract:
  The points raised in the Comment are addressed and except for one error,
which will be corrected, the conclusion is that all of our findings are
accurate.


title:
The Z-Z' Mass Hierarchy in a Supersymmetric Model with a Secluded
  U(1)'-Breaking Sector

abstract:
  We consider the Z'/Z mass hierarchy in a supersymmetric model in which the
U(1)' is broken in a secluded sector coupled to the ordinary sector only by
gauge and possibly soft terms. A large mass hierarchy can be achieved while
maintaining the normal sparticle spectra if there is a direction in which the
tree level potential becomes flat when a particular Yukawa coupling vanishes.
We describe the conditions needed for the desired breaking pattern, to avoid
unwanted global symmetries, and for an acceptable effective mu parameter. The
electroweak breaking is dominated by A terms rather than scalar masses, leading
to tan beta ~ 1. The spectrum of the symmetry breaking sector is displayed.
There is significant mixing between the MSSM particles and new standard model
singlets, for both the Higgs scalars and the neutralinos. A larger Yukawa
coupling for the effective mu parameter is allowed than in the NMSSM because of
the U(1)' contribution to the running from a high scale. The upper bound on the
tree-level mass of the lightest CP even Higgs doublet mass is about c x 174
GeV, where c is of order unity, but the actual mass eigenvalues are generally
smaller because of singlet mixing.


title: Electric Flux Sectors and Confinement

abstract:
  We study the fate of static fundamental charges in the thermodynamic limit
from Monte-Carlo simulations of SU(2) with suitable boundary conditions.


title:
Analysis of solar neutrino induced double beta processes for several
  nuclei

abstract:
  We investigate neutrino flux induced double beta transitions in targets built
of Cd112, Cd114, Cd116 and O18 isotopes. In addition to known beta^- beta^-
channel we consider new beta^- beta^+ and beta^- beta^+ gamma modes of the
neutrino induced double beta process. A possibility of detection of the solar
neutrinos via the induced double beta transitions of interest is discussed. We
note that the beta^- part of the solar neutrino induced beta^- beta^+ process
in O18 was already discussed in Ref. [9,10] in connection with a possible
influence of high energy electron production of this origin on the
SuperKamiokande results.


title:
Two Specific Correlation Patterns as Indicators for Various Random
  Multiplicative Cascade Processes

abstract:
  It is suggested and demonstrated that two specific 2-dimensional correlation
patterns, fixed-to-arbitrary bin and neighboring bin correlation patterns, are
efficient for identifying various random multiplicative cascade processes. A
possible application of these two correlation patterns to single event analysis
in Relativistic Heavy Ion Collider experiments is discussed.


title:
Theoretical Directional and Modulated Rates for Direct SUSY Dark Matter
  Detection

abstract:
  Exotic dark matter together with the vacuum energy (cosmological constant)
seem to dominate in the flat Universe. Thus direct dark matter detection is
central to particle physics and cosmology. Supersymmetry provides a natural
dark matter candidate, the lightest supersymmetric particle (LSP). Furthermore
from the knowledge of the density and velocity distribution of the LSP, the
quark substructure of the nucleon and the nuclear structure (form factor and/or
spin response function), one is able to evaluate the event rate for LSP-nucleus
elastic scattering. The thus obtained event rates are, however, very low. So it
is imperative to exploit the two signatures of the reaction, namely the
modulation effect, i.e. the dependence of the event rate on the Earth's motion,
and the directional asymmetry, i.e. the dependence of the rate on the the
relative angle between the direction of the recoiling nucleus and the sun's
velocity. These two signatures are studied in this paper employing various
velocity distributions and a supersymmetric model with universal boundary
conditions at large tan(beta).


title: QCD as a theory of hadrons (from partons to confinement)

abstract:
  This submission is withdrawn by arXiv administrators. arXiv does not accept
book advertisements.


title: Aspects of the Quantum Chromo Dynamics Phase Diagram

abstract:
  I briefly review some aspects of the Quantum Chromo Dynamics phase diagram at
non zero temperature and quark chemical potential. I then suggest new possible
phases which can appear in strongly interacting theories at non zero chemical
potential. Finally I describe the phase diagram as function of the number of
flavors and colors at zero quark chemical potential and zero temperature.


title: Decisive Role of Fragmentation Functions in Hard Hadron Production

abstract:
  It is demonstrated that the fragmentation functions at large momentum
fraction play a key role in hard hadron production from relativistic
proton-proton collisions. We find that this region of the fragmentation
functions is not strongly constrained by the electron-positron data. This
freedom can be used (together with the transverse momentum distribution of
partons) to reproduce hard pion-to-proton ratio data in relativistic
proton-proton collisions.


title: T-Violating Triple-Product Correlations in Charmless Lambda_b Decays

abstract:
  Using factorization, we compute, within the standard model, the T-violating
triple-product correlations in the charmless decays Lambda_b -> F_1 F_2, where
F_1 is a light spin-1/2 baryon and F_2 is a pseudoscalar (P) or vector (V)
meson. We find a large triple-product asymmetry of 18% for the decay Lambda_b
-> p K^-. However, for other classes of Lambda_b -> F_1 P decays, the asymmetry
is found to be at most at the percent level. For Lambda_b -> F_1 V decays, we
find that all triple-product asymmetries are small (at most O(1%)) for a
transversely-polarized V, and are even smaller for longitudinal polarization.
Our estimates of the nonfactorizable contributions to these decays show them to
be negligible, and we describe ways of testing this.


title: Supersymmetric Higgs Bosons in a 5D Orbifold Model

abstract:
  We analyze the phenomenology of the Higgs sector in a 5D model compactified
on an $S_1/Z_2$ orbifold where the compactification scale $M_C$ is around the
TeV scale. We show that the conventional MSSM Higgs boson mass bounds in 4D can
be violated when we allow the gauge sector, Higgs and third family multiplets
to live in the fifth extra dimension. Supersymmetry is broken at an orbifold
fixed point which is spatially separated from the Yukawa brane where two chiral
families are localized. When the brane-localized supersymmetry breaking term
for the stop sector is arbitrarily large, we find that the stop KK-mode mass
spectrum is completely independent of the Higgs fields. Hence, the Higgs masses
only receive radiative contributions from the top KK-modes. The 1-loop
effective potential is insensitive to the cutoff scale of the theory and yields
a negative Higgs squared-mass contribution that triggers electroweak symmetry
breaking in the range $1.5\simlt\tan\beta\simlt 20$, where bottom/sbottom loop
effects can be ignored. The recent LEP Higgs bound at $m_{h^{0}} > 114.1$ GeV,
in conjunction with naturalness arguments, allows us to bracket the
compactification scale $1.5 \simlt M_{C} \simlt 4$ TeV. Within this parameter
space, we find that the lightest Higgs boson mass has an upper bound $m_{h^{0}}
\simlt 160$ GeV with the magnitude of the $\mu$-parameter restricted to the
range $33 \simlt | \mu | \simlt 347$ GeV.


title: Iso-singlet Down Quark Mixing And CP Violation Experiments

abstract:
  We confront the new physics models with extra iso-singlet down quarks in the
new CP violation experimental era with $\sin{(2\beta)}$ and
$\epsilon'/\epsilon$ measurements, $K^+ \to \pi^+ \nu \bar{\nu}$ events, and
$x_s$ limits. The closeness of the new experimental results to the standard
model theory requires us to include full SM amplitudes in the analysis. In
models allowing mixing to a new isosinglet down quark, as in E$_6$, flavor
changing neutral currents are induced that allow a $Z^0$ mediated contribution
to $B-\bar B$ mixing and which bring in new phases. In $(\rho,\eta)$,
$(x_s,\sin{(\gamma)})$, and $(x_s, \sin{(2\phi_s)})$ plots we still find much
larger regions in the four down quark model than in the SM, reaching down to
$\eta \approx 0$, $0 \leq \sin{(\gamma)} \leq 1$, $-.75 \leq \sin{(2\alpha)}
\leq 0.15$, and $\sin{(2\phi_s)}$ down to zero, all at 1$\sigma$. We elucidate
the nature of the cancellation in an order $\lambda^5$ four down quark mixing
matrix element which satisfies the experiments and reduces the number of
independent angles and phases. We also evaluate tests of unitarity for the
$3\times3$ CKM submatrix.


title:
Influence of perturbations on the electron wave function inside the
  nucleus

abstract:
  A variation of the valence electron wave function inside a nucleus induced by
a perturbative potential is expressed in terms of the potential momenta. As an
application we consider QED vacuum polarization corrections due to the Uehling
and Wichmann-Kroll potentials to the weak interaction matrix elements.


title:
Very light sbottom and gluino scenario confronting electroweak precision
  tests

abstract:
  The minimal supersymmetric model with light sbottom ($\sim m_b$) and light
gluino (12 $\sim$ 16 GeV) can explain the excess of bottom quark production
cross section at hadron colliders and has drawn much attention. We calculate
one-loop contribution to Z-pole observable $R_b$ in this scenario when large CP
violating phases are allowed in the gluino mass and/or sbottom sector. We show
that these large CP violating phases can suppress the new contribution $\delta
R_b$ safely within the experimental bounds even for heavier sbottom too heavy
($\wt{b}_2 \gtrsim$ 200 GeV) to be produced at LEP2 in association with light
sbottom $\wt{b}_1$.


title: Neutrino Wave Packets in Quantum Field Theory

abstract:
  We present a model of neutrino oscillations in the framework of quantum field
theory in which the propagating neutrino and the particles participating to the
production and detection processes are described by wave packets. The neutrino
state is a superposition of massive neutrino wave packets determined by the
production process, as naturally expected from causality. We show that the
energies and momenta of the massive neutrino components relevant for neutrino
oscillations are in general different from the average energies and momenta of
the propagating massive neutrino wave packets, because of the effects of the
detection process. Our results confirm the correctness of the standard
expression for the oscillation length of extremely relativistic neutrinos and
the existence of a coherence length.


title: Using Tau Polarization as a Distinctive SUGRA Signature at LHC

abstract:
  In the minimal SUGRA model the lighter tau slepton is expected to be the
second lightest superparticle over a large parameter range at large
$\tan\beta$. Consequently one expects a viable SUGRA signal at LHC in the tau
lepton channel coming from the decay of these tau sleptons. The model predicts
the polarization of this tau lepton to be +1 to a very good accuracy. We show
how this prediction can be tested by looking at the momentum fraction of the
tau-jet, carried by the charged prong, in its 1-prong hadronic decay channel.


title: Scalar $a_0(980)$ meson in $\phi\to \pi^{0}\eta\gamma$ decay

abstract:
  We study the radiative decay $\phi\to\pi^{0}\eta\gamma$ within the framework
of a phenomenological approach in which the contributions of $\rho$-meson,
chiral loop and $a_0$-meson are considered. We analyze the interference effects
between different contributions and utilizing the experimental branching ratio
and invariant $\pi^0\eta$ mass spectrum for $\phi\to\pi^{0}\eta\gamma$ decay we
estimate the branching ratio of $\phi\to a_0\gamma$ decay.


title: Spin Effects in High Energy Fragmentation Processes

abstract:
  Recent measurements, in particular those on $\Lambda$ polarization and spin
alignment of vector mesons in $e^+e^-$ annihilation at LEP, and those on the
azimuthal asymmetry at HERA, have attracted much attention on the spin effects
in high energy fragmentation processes. In this talk, we make a brief
introduction to the different topics studied in this connection and a short
summary of the available data. After that, we present a short summary of the
main theoretical results that we obtained in studying these different topics.
The talk was mainly based on the publications [5-9] which have been finished in
collaboration with C.Boros, Liu Chun-xiu and Xu Qing-hua.


title:
Eikonal Approximation to 5D Wave Equations as Geodesic Motion in a
  Curved 4D Spacetime

abstract:
  We first derive the relation between the eikonal approximation to the Maxwell
wave equations in an inhomogeneous anisotropic medium and geodesic motion in a
three dimensional Riemannian manifold using a method which identifies the
symplectic structure of the corresponding mechanics. We then apply an analogous
method to the five dimensional generalization of Maxwell theory required by the
gauge invariance of Stueckelberg's covariant classical and quantum dynamics to
demonstrate, in the eikonal approximation, the existence of geodesic motion for
the flow of mass in a four dimensional pseudo-Riemannian manifold. These
results provide a foundation for the geometrical optics of the five dimensional
radiation theory and establish a model in which there is mass flow along
geodesics. Finally we discuss the case of relativistic quantum theory in an
anisotropic medium as well. In this case the eikonal approximation to the
relativistic quantum mechanical current coincides with the geodesic flow
governed by the pseudo-Riemannian metric obtained from the eikonal
approximation to solutions of the Stueckelberg-Schr\"odinger equation. This
construction provides a model for an underlying quantum mechanical structure
for classical dynamical motion along geodesics on a pseudo-Riemannian manifold.
The locally symplectic structure which emerges is that of Stueckelberg's
covariant mechanics on this manifold.


title: Double-Logarithmic Two-Loop Self-Energy Corrections to the Lamb Shift

abstract:
  Self-energy corrections involving logarithms of the parameter Zalpha can
often be derived within a simplified approach, avoiding calculational
difficulties typical of the problematic non-logarithmic corrections (as
customary in bound-state quantum electrodynamics, we denote by Z the nuclear
charge number, and by alpha the fine-structure constant). For some logarithmic
corrections, it is sufficient to consider internal properties of the electron
characterized by form factors. We provide a detailed derivation of related
self-energy ``potentials'' that give rise to the logarithmic corrections; these
potentials are local in coordinate space. We focus on the double-logarithmic
two-loop coefficient B_62 for P states and states with higher angular momenta
in hydrogenlike systems. We complement the discussion by a systematic
derivation of B_62 based on nonrelativistic quantum electrodynamics (NRQED). In
particular, we find that an additional double logarithm generated by the
loop-after-loop diagram cancels when the entire gauge-invariant set of two-loop
self-energy diagrams is considered. This double logarithm is not contained in
the effective-potential approach.


title: CompHEP/SUSY package

abstract:
  The CompHEP software package allows the evaluation of cross section and
decays of elementary particles with a high level of automation. Arbitrary tree
levelp rocesses can be calculated starting from the set of vertices prescribed
by a given physical model. This note describes the details of the Minimal
Supersymmetric Standard Model (MSSM) implementation in the CompHEP package, and
the notation for the particles and parameters of the MSSM in CompHEP.


title:
Electroweak properties of the nucleon in a chiral constituent quark
  model

abstract:
  Results for all elastic electroweak nucleon form factors are presented for
the chiral constituent quark model based on Goldstone-boson-exchange dynamics.
The calculations are performed in a covariant framework using the point-form
approach to relativistic quantum mechanics. The direct predictions of the model
yield a remarkably consistent picture of the electroweak nucleon structure.


title:
The SNO Solar Neutrino Data, Neutrinoless Double Beta-Decay and Neutrino
  Mass Spectrum

abstract:
  Assuming 3 neutrino mixing and massive Majorana neutrinos, we analyze the
implications of the results of the solar neutrino experiments, including the
latest SNO data, which favor the LMA MSW solution of the solar neutrino problem
with \tan^2 \theta_sol < 1, for the predictions of the effective Majorana mass
|<m>| in neutrinoless double beta decay. For \cos (2 \theta_sol) \geq 0.26,
which follows from the analysis of the new solar neutrino data, we find
significant lower limits on |<m>| in the cases of quasi-degenerate and inverted
hierarchy neutrino mass spectrum, |<m>| \geq 0.035 eV and |<m>| \geq 8.5 10^-3
eV, respectively. If the spectrum is hierarchical the upper limit holds |<m>|
\leq 8.2 10^-3 eV. Correspondingly, not only a measured value of |<m>| \neq 0,
but even an experimental upper limit on |<m>| of the order of few 10^-2 eV can
provide information on the type of the neutrino mass spectrum; it can provide
also a significant upper limit on the mass of the lightest neutrino m1. A
measured value of |<m>| \geq 0.2 eV, combined with data on neutrino masses from
the tritium beta-decay experiment KATRIN might allow to establish whether the
CP-symmetry is violated in the lepton sector.


title:
QCD-corrected spin analysing power of jets in decays of polarized top
  quarks

abstract:
  We present results for the differential distributions of jets from
non-leptonic decays of polarized top quarks within the Standard Model,
including QCD radiative corrections. Our work extends existing results which
are only available for semileptonic top quark decays at the parton level. For
$t(\uparrow)$ -> b-jet + 2 light jets we compute in particular the
QCD-corrected top-spin analysing power of the b-quark jet and the least
energetic light jet. The dependence of the results on the choice of the jet
recombination scheme is found to be small. In addition we compute the spin
analysing power of the thrust axis. Our results constitute a so far missing
ingredient to analyse top quark production and subsequent non-leptonic decay at
next-to-leading order in alpha_s, keeping the full information on the top quark
polarization.


title: Microscopic Black Hole Production in TeV-Scale Gravity

abstract:
  Models with extra spatial dimensions and TeV-scale gravity offer the first
opportunity to test the conjecture of black hole formation in trans-Planckian
energy scattering with small impact parameters. After a brief review of
gravitational scattering at ultrahigh energies and scenarios of TeV-scale
gravity, search strategies at the LHC, at the Pierre Auger (cosmic ray)
Observatory and at the neutrino telescopes AMANDA/IceCube are illustrated with
the simplest but nevertheless representative example: production of
Schwarzschild black holes and their observation via Hawking radiation in the
large extra dimension scenario. Some more general features of the production of
higher-dimensional black holes and/or uncertainties in the estimates are also
outlined.


title: Supersymmetric Higgs Triplets and Bilinear R-Parity Nonconservation

abstract:
  The supersymmetric standard model of particle interactions is extended to
include two Higgs triplet superfields at the TeV scale, carrying two units of
lepton number. Realistic tree-level Majorana neutrino masses are obtained in
the presence of soft, i.e. bilinear, R-parity nonconservation.


title: Neutralino-stop coannihilation in the CMSSM

abstract:
  Neutralino as the lightest supersymmetric particle (LSP) is a candidate for
supersymmetric dark matter. It is known that coannihilation effects could be
important in neutralino relic density calculation. Here we present some results
on neutralino-stop coannihilation in the CMSSM. In this model, the lighter stop
can be degenerate with the lightest neutralino chi when |A_0| is not equal to 0
and large, more specifically when the lighter stop mass is suppressed by large
off-diagonal terms in the stop square mass matrix. In the region where the stop
is slightly heavier than the neutralino, the coannihilation effect brings the
relic density into the range favored by cosmology. While the neutralino-stop
coannihilation channels do not increase the range of m_chi, they do extend the
cosmologically preferred region to larger values of m_0.


title:
Color superconductivity in two- and three-flavor systems at moderate
  densities

abstract:
  Basic features of color superconductivity are reviewed, focusing on the
regime of ``moderate densities'', which is not accessible by perturbation
theory. We discuss the standard picture of two- and three flavor color
superconductors and study the color-flavor unlocking phase transition within an
NJL-type model.


title: eta in the nuclear medium within a chiral unitary approach

abstract:
  The self-energy of an eta meson in the nuclear medium is calculated in a
chiral unitary approach.
  A coupled channel Bethe-Salpeter equation is solved to obtain the effective
eta-N interaction in the medium.
  The base model reproduces well the free space pi-N elastic and inelastic
scattering at the eta-N threshold or N^*(1535) region.
  The Pauli blocking on the nucleons, binding potentials for the baryons and
self-energies of the mesons are incorporated, including the eta self-energy in
a self-consistent way.
  Our calculation predicts about -54 -i29 MeV for the optical potential at
normal nuclear matter for an eta at threshold but also shows a strong energy
dependence of the potential.


title:
Active-Sterile Neutrino Conversion: Consequences for the r-Process and
  Supernova Neutrino Detection

abstract:
  We examine active-sterile neutrino conversion in the late time
post-core-bounce supernova environment. By including the effect of feedback on
the Mikheyev-Smirnov-Wolfenstein (MSW) conversion potential, we obtain a large
range of neutrino mixing parameters which produce a favorable environment for
the r-process. We look at the signature of this effect in the current
generation of neutrino detectors now coming on line. We also investigate the
impact of the neutrino-neutrino forward scattering-induced potential on the MSW
conversion.


title: Colourless Mesons in a Polychromatic World

abstract:
  The limit of a large number of QCD colours gives a useful approximation
scheme to the physical hadronic world. A brief overview of the mesonic sector
is presented. The large-Nc constraints on the low-energy chiral couplings are
summarized and the role of unitarity corrections is discussed. As an important
illustration of the 1/Nc expansion techniques, the Standard Model prediction of
epsilon'/epsilon is reviewed.


title: Toward the Semiclassical Theory of the High Energy Heavy Ion Collisions

abstract:
  Sudden deposition of energy at the early stage of high energy heavy ion
collisions makes virtual gluon fields real.
  The same is true for virtual vacuum fields $under$ the topological barrier,
excited to real states $at$ or $above$ the barrier, gluomagnetic clusters of
particular structure related to the $sphalerons$ of the electroweak theory.
Semiclassically, these states play the role of the {\em ``turning points''}.
After being produced they explode into a spherical shell of coherent field
which then turn into several outgoing gluons. Furthermore, this explosions
promptly produce quark pairs, as seen from explicit solution of the Dirac
equation.
  The masses of such clusters depend on their size, and are expected to peak at
$M\sim 3 GeV$. After we briefly review those consepts in a non-technical
manner, we discuss what observable consequences the production of such clusters
would make in the context of heavy ion collisions, especially at the RHIC
energies. We discuss entropy and especially quark production, event-by-event
fluctuations in collective effects like radial and elliptic flows and $J/\psi$
suppression. Coherent fields and their geometry increase the jet quenching, and
we also point out the existene of ``explosive edge'' which jump-start
collective effects and may affect unusual phenomena seen at RHIC at large
$p_t$.


title:
A Full Determination of the Neutrino Mass Spectrum from Two-zero
  Textures of the Neutrino Mass Matrix

abstract:
  We show that it is possible to fully determine the neutrino mass spectrum
from two-zero textures of the neutrino mass matrix. As a consequence, definite
predictions can be obtained for the neutrinoless double beta decay.


title:
Black hole, string ball, and p-brane production at hadronic
  supercolliders

abstract:
  In models of large extra dimensions, the string and Planck scales become
accessible at future colliders. When the energy scale is above the string scale
or Planck scale a number of interesting phenomena occur, namely, production of
stringy states, p-branes, string balls, black hole, etc. In this work, we
systematically study the production cross sections of black holes, string
balls, and p-branes at hadronic supercolliders. We also discuss their
signatures. At the energy scale between the string scale M_s and M_s/g_s^2,
where g_s is the string coupling, the production is dominated by string balls,
while beyond M_s/g_s^2 it is dominated by black holes. The production of a
p-brane is only comparable to black holes when the p-brane wraps entirely on
small extra dimensions. Rough estimates on the sensitivity reaches on the
fundamental Planck scale M_D are also obtained, based on the number of raw
events.


title:
Fayet-Iliopoulos terms in 5d theories and their phenomenological
  implications

abstract:
  Supersymmetric theories in 5d orbifold can have Fayet-Iliopoulos (FI) terms
on the boundaries. These terms induce a 5d mass for the bulk matter fields. We
analyze this effect using N=1 superfields and show how it can be understood as
a mixing between the U(1) gauge boson and the graviphoton. We also study the
implications of the FI-terms in the mass spectrum of theories with
Scherk-Schwarz supersymmetry breaking. We present a new 5d supersymmetric model
that has the massless spectrum of the Standard Model and predicts a Higgs boson
with a mass around the present experimental limit.


title: Potential for Supernova Neutrino Detection in MiniBooNE

abstract:
  The MiniBooNE detector at Fermilab is designed to search for $\nu_\mu \to
\nu_e$ oscillation appearance at $E_\nu \sim 1 {\rm GeV}$ and to make a
decisive test of the LSND signal. The main detector (inside a veto shield) is a
spherical volume containing 0.680 ktons of mineral oil. This inner volume,
viewed by 1280 phototubes, is primarily a \v{C}erenkov medium, as the
scintillation yield is low. The entire detector is under a 3 m earth
overburden. Though the detector is not optimized for low-energy (tens of MeV)
events, and the cosmic-ray muon rate is high (10 kHz), we show that MiniBooNE
can function as a useful supernova neutrino detector. Simple trigger-level cuts
can greatly reduce the backgrounds due to cosmic-ray muons. For a canonical
Galactic supernova at 10 kpc, about 190 supernova $\bar{\nu}_e + p \to e^+ + n$
events would be detected. By adding MiniBooNE to the international network of
supernova detectors, the possibility of a supernova being missed would be
reduced. Additionally, the paths of the supernova neutrinos through Earth will
be different for MiniBooNE and other detectors, thus allowing tests of
matter-affected mixing effects on the neutrino signal.


title: Chirality Violation in QCD Reggeon Interactions

abstract:
  The appearance of the triangle graph infra-red axial anomaly in reduced quark
loops contributing to QCD triple-regge interactions is studied. In a dispersion
relation formalism, the anomaly can only be present in the contributions of
unphysical triple discontinuities. In this paper an asymptotic discontinuity
analysis is applied to high-order feynman diagrams to show that the anomaly
does indeed occur in sufficiently high-order reggeized gluon interactions. The
reggeon states involved must contain reggeized gluon combinations with the
quantum numbers of the anomaly (winding-number) current. A direct connection
with the well-known U(1) problem is thus established. Closely related diagrams
that contribute to the pion/pomeron and triple pomeron couplings in color
superconducting QCD are also discussed.


title: Photon production in high energy proton-nucleus collisions

abstract:
  We calculate the photon production cross-section in $pA$ collisions under the
assumption that the nucleus has reached the saturation regime, while the proton
can be described by the standard parton distribution functions. We show that
due to the strong classical field $O(1/g)$ of the nucleus, bremsstrahlung
diagrams become dominant over the direct photon diagrams. In particular, we
show that $\gamma-$jet transverse momentum spectrum and correlations are very
sensitive to gluon saturation effects in the nucleus.


title: Radiative origin of solar scale and U_{e3}

abstract:
  We make a general study of possibility of generating solar scale
$\Delta_{\odot}$ and the CHOOZ angle $U_{e3}$ radiatively by assuming that they
are zero at some high scale. The most general neutrino mass matrix leading to
this result is determined in a CP conserving theory. This matrix contains four
independent parameters which can be fixed in terms of physical observables. The
standard weak radiative corrections then lead to non-zero $\Delta_{\odot}$ and
$U_{e3}$ without drastically altering the other tree level results. As a
consequence, both $\Delta_{\odot}$ and $U_{e3}$ are predicted in terms of other
physically observable parameters. These predictions are insensitive to specific
form of the neutrino mass matrix. The solar scale and $U_{e3}$ are strongly
correlated with the effective neutrino mass $m_{ee}$ probed in neutrinoless
double beta decay. In particular, the LMA solution to the solar neutrino
problem arise for $m_{ee}$ close to the present experimental limit. An example
of specific texture is presented which predicts maximal atmospheric mixing and
$\tan^2 \theta_{\odot}\approx 0.5$ for the solar mixing angle $\theta_{\odot}$.


title: Reducing theoretical uncertainties in mb and lambda1

abstract:
  We calculate general moments of the lepton energy spectrum in inclusive
semileptonic B -> X_c l \nu decay. Moments which allow the determination of
mb^{1S} and lambda1 with theoretical uncertainties Delta(mb^{1S}) ~ 0.04 GeV
and Delta(lambda1) ~ 0.05 GeV^2 are presented. The short distance 1S mass is
used to extract a mass parameter free of renormalon ambiguities. Moments which
are insensitive to mb and lambda1 and therefore test the size of the 1/mb^3
matrix elements and the validity of the OPE are also presented. Finally, we
give an expression for the total branching ratio with a lower cut on the lepton
energy, which allows one to eliminate a source of model dependence in current
determinations of |Vcb| from B -> X_c l \nu decay.


title: Review of the Phenomenology of Noncommutative Geometry

abstract:
  We present a pedagogical review of particle physics models that are based on
the noncommutativity of space-time, $[\hat{x}_\mu,\hat{x}_\nu]=i \theta_{\mu
\nu}$, with specific attention to the phenomenology these models predict in
particle experiments either in existence or under development. We summarize
results obtained for high energy scattering such as would occur for example in
a future $e^+e^-$ linear collider with $\sqrt{s} = 500 GeV$, as well as low
energy experiments such as those pertaining to elementary electric dipole
moments and other $\cpviolng$ observables, and finally comment on the status of
phenomenological work in cosmology and extra dimensions.


title: Flat manifold leptogenesis in the supersymmetric standard model

abstract:
  Flat manifold leptogenesis a la Affleck-Dine is investigated with the slepton
and Higgs fields, L, H_u, H_d, in the supersymmetric standard model. The
multi-dimensional motion of these scalar fields is realized in the case that
the L H_u and H_u H_d directions are comparably flat with the relevant
non-renormalizable superpotential terms. Soon after the inflation, the lepton
number asymmetry appears to fluctuate due to this multi-dimensional motion
involving certain CP violating phases. Then, it is fixed to some significant
non-zero value for the successful baryogenesis when the scalar fields begin to
oscillate with rotating phases driven by the quartic coupling from the
superpotential term h_e L H_d e^c with h_e \sim 10^-5 - 10^-3. The Hubble
parameter H_osc at this epoch for the completion of leptogenesis is much larger
than the gravitino mass m_3/2 \sim 10^3 GeV. The thermal terms may even play a
cooperative role in this scenario of early leptogenesis. The lightest neutrino
mass can be 10^-4 eV, if the reheating temperature is allowed to be 10^10 GeV.


title: Electron Energy Spread in Laser Cooling Process

abstract:
  The problem of electrons energy spread in the linear back Compton scattering
process has been considered in the paper. The adjoint kinetic equation for the
electrons passing through a laser flash has been obtained and used to get the
equations for the mean energy and the variance of the energy distribution. The
equations for the distribution moments have been obtained and solved by the
iteration method in the continuous slowing down approximation with approximate
description of the energy loss fluctuation. It has been shown that the variance
of the energy distribution as a function of the electron - photon collisions
number in laser flash has a maximum for the electron beam with small incident
energy spread. The beam energy spread damping in the laser-electron storage
ring has been studied. The data of approximate analytical calculations are
compared with the results of the Monte Carlo simulation.


title:
Energy criterion to select the behavior of dynamical masses in
  technicolor models

abstract:
  We propose a quite general ansatz for the dynamical mass in technicolor
models. We impose on this ansatz the condition for formation of the tightest
composite boson state, or the criterion that it should lead to the deepest
minimum of energy. This criterion indicates a particular form of the
technifermion self energy.


title:
Non-thermal dark matter via Affleck-Dine baryogenesis and its detection
  possibility

abstract:
  The formation and late time decays of Q-balls are generic consequences of the
Affleck-Dine (AD) baryogenesis. A substantial amount of the lightest
supersymmetry (SUSY) particles (LSPs) are produced non-thermally as the decay
products of these Q-balls. This requires a significantly large annihilation
cross section of the LSP so as not to overclose the universe, which predicts a
higgsino- or wino-like LSP instead of the standard bino LSP. We have reexamined
the AD baryogenesis with special attention to the late-time decays of the
Q-balls, and then specified the parameter regions where the LSPs produced by
the Q-ball decays result in a cosmologically interesting mass density of dark
matter by adopting several SUSY breaking models. This reveals new
cosmologically interesting parameter regions, which have not attracted much
attention so far. We have also investigated the prospects of direct and
indirect detection of these dark matter candidates, and found that there is an
intriguing possibility to detect them in various next generation dark matter
searches.


title: Studying Bounds on Lepton Flavor Violating (LFV) Decay Processes

abstract:
  This dissertation reviews the Standard Model formalism as well as the Lepton
Flavour Violating (LFV) decay processes which cause its extension, known as the
physics beyond the SM. Firstly, using the experimental bounds on three body LFV
decays, the corresponding bounds on two body LFV decays are reviewed. The
dynamical suppression of three body LFV decays due to momentum dependent
couplings is also reviewed. Secondly, the role of the LFV decays to explain the
LSND excess is discussed in detail, for which the experimental bounds on three
body LFV decays, i.e. \mu -> 3e are used to constraint the coupling
\tilde{g}_{Z_{\mu e}}, which is needed to calculate the anomalous muon decay
\mu -> e\nu_l\bar{\nu}_l. Then comparing the effective coupling of anomalous
muon decay to r>1.6\times 10^{-3} [9809524], it is proved that LFV is not the
correct hypothesis to explain the LSND excess. Finally, LFV decays at loop
order are studied in Seesaw model of neutrino masses [PRL. 86 2502 (2001)]
where the smallness of the Seesaw neutrino mass may be naturally realized with
m_N (mass of right-handed singlet neutrinos) of order 1 TeV. It is shown that
the Higgs mass of a new scalar doublet with lepton number L=-1 needed in the
model has to be larger than 50 TeV to get the branching ratio of \mu -> 3e to
be consistent with the existing bound on \mu -> 3e. This defeats the original
motivation of the model, namely that there is no physics beyond the TeV energy
scale.


title:
Constraints on R-parity violating supersymmetry from leptonic and
  semileptonic tau, B_d and B_s decays

abstract:
  We put constraints on several products of R-parity violating lambda lambda'
and lambda' lambda' type couplings from leptonic and semileptonic tau, B_d and
B_s decays. Most of them are one to two orders of magnitude better than the
existing bounds, and almost free from theoretical uncertainties. A significant
improvement of these bounds can be made in high luminosity tau-charm or B
factories.


title: On the status of neutrino mixing and oscillations

abstract:
  Evidences in favor of neutrino oscillations, obtained in the solar and
atmospheric neutrino experiments, are discussed. Neutrino oscillations in the
solar and atmospheric ranges of the neutrino mass-squared differences are
considered in the framework of the minimal scheme with the mixing of three
massive neutrinos.


title:
A perturbative QCD analysis of charged-particle distributions in
  hadronic and nuclear collisions

abstract:
  We compute the distributions of charged particles at large transverse momenta
in $p\bar p(p)$, $pA$ and $AA$ collisions in the framework of perturbative QCD,
by using collinear factorization and the modern PDFs and fragmentation
functions. At the highest cms-energies the shape of the spectra measured in
$p\bar p(p)$ collisions at large $q_T$ can be well explained. The difference
between the data and the lowest-order computation is quantified in terms of a
constant $K$-factor for each energy. The $K$-factor is found to systematically
decrease with growing $\sqrt s$. Also a lower limit for the partonic transverse
momentum, $p_0$, is extracted for each $\sqrt s$ based on the comparison with
the measurements. A systematic increase of $p_0$ as a function of $\sqrt s$ is
found. Nuclear effects in the charged-particle spectra in $pA$ and $AA$
collisions at RHIC and LHC are studied in the framework of collinear
factorization by applying the EKS98 nuclear corrections to the parton
distributions. The nuclear effects are shown to mostly enhance the computed
spectra. A comparison with the recent PHENIX data from central and peripheral
Au+Au collisions at RHIC is done.


title: Canonical enhancement as a result of Poisson distribution

abstract:
  We point out that a certain finite size effect in heavy ion physics, the
canonical enhancement, is based on the difference of conservation constrained
pair statistics for Poisson and Gauss distributions, respectively. Consequently
it should occur in a wide range of phenomena, whenever comparing rare and
frequent events.


title: Ultra-High Energy Neutrino Fluxes and Their Constraints

abstract:
  Applying our recently developed propagation code we review extragalactic
neutrino fluxes above 10^{14} eV in various scenarios and how they are
constrained by current data. We specifically identify scenarios in which the
cosmogenic neutrino flux, produced by pion production of ultra high energy
cosmic rays outside their sources, is considerably higher than the
"Waxman-Bahcall bound". This is easy to achieve for sources with hard injection
spectra and luminosities that were higher in the past. Such fluxes would
significantly increase the chances to detect ultra-high energy neutrinos with
experiments currently under construction or in the proposal stage.


title:
Probing Physics at Extreme Energies with Cosmic Ultra-High Energy
  Radiation

abstract:
  The highest energy cosmic rays observed possess macroscopic energies and
their origin is likely to be associated with the most energetic processes in
the Universe. Their existence triggered a flurry of theoretical explanations
ranging from conventional shock acceleration to particle physics beyond the
Standard Model and processes taking place at the earliest moments of our
Universe. Furthermore, many new experimental activities promise a strong
increase of statistics at the highest energies and a combination with gamma-ray
and neutrino astrophysics will put strong constraints on these theoretical
models. We give an overview over this quickly evolving research field with
focus on testing new particle physics.


title:
Angular Dependence of Neutrino Flux in KM3 Detectors in Low Scale
  Gravity Models

abstract:
  Cubic kilometer neutrino telescopes are capable of probing fundamental
questions of ultra-high energy neutrino interactions. There is currently great
interest in neutrino interactions caused by low-scale, extra dimension models.
Above 1 PeV the cross section in low scale gravity models rises well above the
total Standard Model cross section. We assess the observability of this effect
in the 1 PeV - 100 PeV energy range of kilometer-scale detectors with several
new points of emphasis that hinge on enhanced neutral current cross sections. A
major point is the importance of ``feed-down'' regeneration of upward neutrino
flux, driven by new-physics neutral current interactions in the flux evolution
equations. Feed-down is far from negligible, and it is essential to include its
effect. We then find that the angular distribution of events has high
discriminating value in separating models. In particular the ``up-to-down''
ratio between upward and downward-moving neutrino fluxes is a practical
diagnostic tool which can discriminate between models in the near future. The
slope of the angular distribution, in the region of maximum detected flux, is
also substantially different in low-scale gravity and the Standard Model. These
observables are only weakly dependent on astrophysical flux uncertainties. We
conclude that angular distributions can reveal a breakdown of the Standard
Model and probe the new physics beyond, as soon as data become available.


title:
Determination of Neutrino mixing parameters after SNO oscillation
  evidence

abstract:
  An updated analysis of all available neutrino oscillation evidence in Solar
experiments (SK day and night spectra, global rates from Homestake, SAGE and
GALLEX) including the latest SNO CC and NC data is presented. Assuming that the
shape of the SNO CC energy spectrum is undistorted and using the information
provided by SNO we obtain, for the fraction of electron neutrinos remaining in
the solar beam at energies $\gsim 5$ MeV:
$\phi_{CC}/\phi_{NC}=0.34^{+0.05}_{-0.04},$ which is nominally $\sim 30\sigma$
away from the standard value. The fraction of oscillating neutrinos which into
active ones is computed to be:
  $ (\Phi_{NC}-\Phi_{CC})/(\Phi_{SSM}-\Phi_{CC})=0.92^{+0.39}_{-0.20} $ nearly
$5\sigma$ deviations from the pure sterile oscillation case. The data is still
compatible with an important fraction of sterile component in the solar beam
(up to 20% of the total). In the framework of two active neutrino oscillations
we determine individual neutrino mixing parameters and their errors in the
region of no spectrum distortion ($\Delta< T_e> <1%$), we obtain $\Delta m^2=
4.5^{+2.7}_{-1.4}\times 10^{-5} \eV^2, \quad \tan^2\theta=0.40^{+0.10}_{-0.08}.
$ This is in agreement with the best $chi^2$ solution in the LMA region.


title: Instantons and baryon dynamics

abstract:
  I explain how instantons break chiral symmetry and how do they bind quarks in
baryons. The confining potential is possibly irrelevant for the task.


title: Cosmology with a long-range repulsive force

abstract:
  We discuss the properties of a cosmology dominated by a charged scalar field
with a repulsive, long-range self-interaction. The interaction, in the form of
a vector field with a tiny mass, can have a dramatic effect on the evolution of
the universe, with interesting consequences -- including in some cases
accelerated expansion. One characteristic of the model is an oscillating
deceleration parameter, which would potentially allow it to be distinguished
from other scalar field models such as quintessence.


title: Invisible decay of orthopositronium vs extra dimensions

abstract:
  In models of Randall-Sundrum type orthopositronium (o-Ps) can disappear due
to tunnelling into additional dimension(s). The experimental signature of this
effect is the invisible decay of orthopositronium. We point out that this
process may occur at a rate within two or three orders of magnitude of the
present experimental upper limit. We discuss this in details and stress that
the existence of invisible decay of orthopositronium in vacuum could explain
the o-Ps decay rate puzzle. Thus, our result enhances the existing motivation
and justifies efforts for a more sensitive search for o-Ps->invisible decay in
a near future experiment. Possible manifestations of new physics in other rare
(exotic) decays of orthopositronium are also discussed.


title: Deconstructing 5-D QED

abstract:
  We discuss periodic compactification and latticization of a 5-D U(1) theory
with a Dirac fermion, yielding a 1+3 effective theory. We address subtleties in
the lattice fermionic action,such as fermion doubling and the Wilson term. We
compute the Coleman-Weinberg potential for the Wilson line which is finite for
N-branes >= 3, due to the Z_N symmetry, which replaces translations in the 5th
dimension. This mode becomes a PNGB in the low energy 1+3 theory. We derive its
anomalous coupling to the "photon" and its KK-modes.


title: Elliptic Flow from a Transversally Thermalized Fireball

abstract:
  The agreement of elliptic flow data at RHIC at central rapidity with the
hydrodynamic model has led to the conclusion of very rapid thermalization. This
conclusion is based on the intuitive argument that hydrodynamics, which assumes
instantaneous local thermalization, produces the largest possible elliptic flow
values and that the data seem to saturate this limit. We here investigate the
question whether incompletely thermalized viscous systems may actually produce
more elliptic flow than ideal hydrodynamics. Motivated by the extremely fast
primordial longitudinal expansion of the reaction zone, we investigate a toy
model which exhibits thermalization only in the transverse directions but
undergoes collisionless free-streaming expansion in the longitudinal direction.
For collisions at RHIC energies, elliptic flow results from the model are
compared with those from hydrodynamics. With the final particle yield and
$\kt$-distribution fixed, the transversally thermalized model is shown not to
be able to produce the measured amount of elliptic flow. This investigation
provides further support for very rapid local kinetic equilibration at RHIC. It
also yields interesting novel results for the elliptic flow of massless
particles such as direct photons.


title: Hard diffraction in lepton-hadron and hadron-hadron collisions

abstract:
  It is argued that the breakdown of factorization observed recently in the
diffractive dijet production in deep inelastic lepton induced and hadron
induced processes is naturally explained in the Good-Walker picture of
diffraction dissociation. The explicit formula for the hadronic cross-section
is given and successfully compared with the existing data.


title: Screening Corrections In Simulating Heavy Ion Collisions

abstract:
  One year ago, we presented a new approach to treat hadronic interactions for
the initial stage of nuclear collisions. It is an effective theory based on the
Gribov-Regge formalism, where the internal structure of the Pomerons at high
energies is governed by perturbative parton evolution, therefore the name
"Parton-Based Gribov-Regge Theory". The main improvement compared to models
used so-far is the appropriate treatment of the energy sharing between the
different elementary interactions in case of multiple scattering. It is clear
that the above formalism is not yet complete. At high energies (RHIC, LHC), the
multiple elementary interactions (Pomerons) can not be purely parallel, they
interact. So we introduce multiple Pomeron vertices into the theory.


title: Solving the solar neutrino problem with kamLAND and BOREXINO

abstract:
  We analyze the expected signals of two future neutrino experiments, kamLAND
and BOREXINO. We show that with just these experiments, we will hopefully be
able to determine which of the existing solutions to the solar neutrino problem
is the real solution. We also analyze existing solar neutrino data and
determine the best-fit points in the oscillation-parameter space finding that
with the inclusion of SNO-charged current, the global-rates analysis gives a
favored LMA solution with a goodness of fit (g.o.f) of just 32.63%, whereas the
g.o.f of the SMA solution is 9.83%. Nonetheless, maximal and quasi-maximal
mixing is not favored. If we include the Superkamiokande spectrum in our \chi^2
analysis, we obtain a LMA solution with a g.o.f. of 84.38%.


title: YFS MC Approach to QCD Soft Gluon Exponentiation

abstract:
  We present two things in this discussion. First, we develop and prove the
theory of the extension of the YFS Monte Carlo approach to higher order SU_{2L}
x U_1 radiative corrections to the analogous higher order QCD radiative
corrections. Contact is made with other pioneering soft gluon resummation
theories in the literature. Second, semi-analytical results and preliminary
explicit Monte Carlo data are presented for the specific example of the
processes p-bar p -> t-bar t +n(G)+X at FNAL energies, where G is a soft gluon
and the respective event generator, ttp1.0, features realistic, event-by-event
simulation of multiple, soft, finite p_T gluon effects in which the infrared
singularities are canceled to all orders in alpha_s. We comment briefly on the
implications of our results on the CDF/D0 observations and on their possible
applications to RHIC physics and to LHC physics.


title: Moduli from Cosmic Strings

abstract:
  Moduli fields are generally present in superstring--inspired models. They are
typically characterized by masses of the order of the supersymmetry breaking
scale and by interactions of gravitational strength to ordinary matter. If
stable, they can easily overclose the Universe. If unstable, strong limits on
their abundance have to be imposed not to disrupt the successful predictions of
nucleosynthesis. We discuss the production of moduli quanta from loops of
cosmic strings, which may form at phase transitions in the early history of the
Universe. As an application, we then focus on strings formed at the end of
hybrid inflation, showing that in this case the coupling of the moduli to the
field which forms the string network has to be much weaker than the typical
gravitational interactions not to exceed the bounds from nucleosynthesis.
Alternatively, if the relevant coupling is of gravitational order, an upper
bound of about 10^13 GeV is imposed on the string energy scale.


title: Electroweak Limits on Non-Universal Z' Bosons

abstract:
  Many types of physics beyond the standard model include an extended
electroweak gauge group. If these extensions are associated with flavor
symmetry breaking, the gauge interactions will not be flavor-universal. In this
note we update the bounds placed by electroweak data on the existence of flavor
non-universal extensions to the standard model in the context of topcolor
assisted technicolor (TC2), noncommuting extended technicolor (NCETC), and the
ununified standard model (UUM). In the first two cases the extended gauge
interactions couple to the third generation fermions differently than to the
light fermions, while in the ununified standard model the gauge interactions
couple differently to quarks and leptons. The extra SU(2) triplet of gauge
bosons in NCETC and UUM models must be heavier than about 3 TeV, while the
extra Z boson in TC2 models must be heavier than about 1 TeV.


title: Photon polarization in radiative B decays

abstract:
  We study decay distributions in B -> K pi pi gamma, combining contributions
from several overlapping resonances in a K pi pi mass range near 1400 MeV,
(1^+) K_1(1400), (2^+) K^*_2(1430) and (1^-) K^*(1410). A method is proposed
for using these distributions to determine a photon polarization parameter in
the effective radiative weak Hamiltonian. This parameter is measured through an
up-down asymmetry of the photon direction relative to the K pi pi decay plane.
We calculate a dominant up-down asymmetry of 0.33 +- 0.05 from the K1(1400)
resonance, which can be measured with about 10^8 B B-bar pairs, thus providing
a new test for the Standard Model and a probe for some of its extensions.


title: Neutrino oscillation data versus minimal supersymmetric SO(10) model

abstract:
  We reconsider the minimal supersymmetric SO(10) model, where only one {\bf
10} and one $\bar{\bf 126}$ Higgs multiplets have Yukawa couplings with matter
multiplets. The model is generalized to include CP-violating phases, and
examined how well its predictions can meet the current neutrino oscillation
data. Using the electroweak scale data about six quark masses, three angles and
one CP-phase in the Cabibbo-Kobayashi-Maskawa matrix and three charged-lepton
masses and given $\tan \beta$ (the ratio of vacuum expectation values of a pair
of Higgs doublets), we obtain the Pontecorvo-Maki-Nakagawa-Sakata matrix and
the ratio, $\Delta m_\odot^2/\Delta m_\oplus^2 $, as functions of only one free
parameter in the model. In our analysis, one-loop renormalization group
equations for the gauge couplings, the Yukawa couplings and the effective
dimension-five operator are used to connect the data between the electroweak
scale and the grand unification scale. Fixing the free parameter appropriately,
we find, for example, $\sin^2 2 \theta_{12} \sim 0.72$, $\sin^2 2 \theta_{23}
\sim 0.90$, $\sin^2 2 \theta_{13} \sim 0.16$ and $\Delta m_\odot^2/\Delta
m_\oplus^2 \sim 0.19$ with $\tan \beta = 45$, which are in agreement with the
current neutrino oscillation data.


title: A Complete Theory of Grand Unification in Five Dimensions

abstract:
  A fully realistic unified theory is constructed, with SU(5) gauge symmetry
and supersymmetry both broken by boundary conditions in a fifth dimension.
Despite the local explicit breaking of SU(5) at a boundary of the dimension,
the large size of the extra dimension allows precise predictions for gauge
coupling unification, alpha_s(M_Z) = 0.118 \pm 0.003, and for Yukawa coupling
unification, m_b(M_Z) = 3.3 \pm 0.2 GeV. A complete understanding of the MSSM
Higgs sector is given; with explanations for why the Higgs triplets are heavy,
why the Higgs doublets are protected from a large tree-level mass, and why the
mu and B parameters are naturally generated to be of order the SUSY breaking
scale. All sources of d=4,5 proton decay are forbidden, while a new origin for
d=6 proton decay is found to be important. Several aspects of flavor follow
from an essentially unique choice of matter location in the fifth dimension:
only the third generation has an SU(5) mass relation, and the lighter two
generations have small mixings with the heaviest generation. The entire
superpartner spectrum is predicted in terms of only two free parameters. The
squark and slepton masses are determined by their location in the fifth
dimension, allowing a significant experimental test of the detailed structure
of the extra dimension. Lepton flavor violation is found to be generically
large in higher dimensional unified theories with high mediation scales of SUSY
breaking. In our theory this forces a common location for all three neutrinos,
predicting large neutrino mixing angles. Rates for mu -> e gamma, mu -> e e e,
mu -> e conversion and tau -> mu gamma are larger in our theory than in
conventional 4D supersymmetric GUTs. Proposed experiments probing mu -> e
transitions will probe the entire interesting parameter space of our theory.


title: Virtual Black Holes at Linear Colliders

abstract:
  We propose that future linear colliders can create virtual black holes even
though their energies are below the fundamental scale, because of the
uncertainty principle. These virtual black holes provide us much information
which cannot be obtained in the production of black holes at the LHC or other
hadron colliders. We can observe lepton flavor and lepton (baryon) number
violating processes at linear colliders by using virtual black holes. And
virtual black holes can be used to the precision measurements of top and W.
They can create only one top quark or one W boson, which leads to the clean
signal that cannot be obtained in pair-production processes.


title: Strong Coupling Constant from the Photon Structure Function

abstract:
  We extract the value of the strong coupling constant alpha_s from a
single-parameter pointlike fit to the photon structure function F_2^gamma at
large x and Q^2 and from a first five-parameter full (pointlike and hadronic)
fit to the complete F_2^gamma data set taken at PETRA, TRISTAN, and LEP. In
next-to-leading order and the MSbar renormalization and factorization schemes,
we obtain alpha_s(m_Z)=0.1183 +/- 0.0050(exp.)^+0.0029_-0.0028(theor.)
[pointlike] and alpha_s(m_Z)=0.1198 +/- 0.0028(exp.)^+0.0034_-0.0046(theor.)
[pointlike and hadronic]. We demonstrate that the data taken at LEP have
reduced the experimental error by about a factor of two, so that a competitive
determination of alpha_s from F_2^gamma is now possible.


title:
Effects of neutrino oscillation on supernova neutrino: inverted mass
  hierarchy

abstract:
  We study the effects of neutrino oscillation on supernova neutrino in the
case of the inverted mass hierarchy ($m_{3} \ll m_{1} < m_{2}$) as well as the
normal mass hierarchy ($m_{1} < m_{2} \ll m_{3}$). Numerical analysis using a
realistic supernova and presupernova model allows us to discuss quantitatively
a possibility to probe neutrino oscillation parameters. We show that
information about the mass hierarchy can be obtained if $\theta_{13}$ is rather
large ($\sin^{2}{2 \theta_{13}} > 10^{-3}$) and that $\theta_{13}$ can be well
probed by SuperKamiokande if the neutrino mass hierarchy is the inverted case.
Errors due to the uncertainty of the original neutrino spectra and the Earth
effect are also discussed.


title:
Yukawa Hierarchy Transfer Based on Superconformal Dynamics and
  Geometrical Realization in String Models

abstract:
  We propose a scenario that leads to hierarchical Yukawa couplings and
degenerate sfermion masses at the same time, in the context of
extra-dimensional models, which can be naturally embedded in a wide class of
string models. The hierarchy of Yukawa couplings and degeneracy of sfermion
masses can be realized thanks to superconformal gauge dynamics. The sfermion
mass degeneracy is guaranteed by taking the superconformal fixed point to be
family independent. In our scenario, the origin of Yukawa hierarchy is
attributed to geometry of compactified dimensions and the consequent volume
dependence of gauge couplings in the superconformal sectors. The difference in
these gauge couplings is dynamically transferred to the hierarchy of the Yukawa
couplings. Thus, our scenario combines a new dynamical approach and the
conventional geometrical approach to the supersymmetric flavor problem.


title:
SU(2)_L * SU(2)_R and U(1)_A restorations high in the hadron spectrum
  and what it tells us about

abstract:
  Recent data for highly excited mesons suggest that not only the chiral
$SU(2)_L\times SU(2)_R$ symmetry of QCD is restored high in the spectrum but
also the $ U(1)_A$ symmetry. This means that it is not a confining interaction
in QCD which triggers the spontaneous breaking of chiral symmetry. The
restoration of the $U(2)_L\times U(2)_R$ symmetry of the QCD Lagrangian implies
the appearance of multiplets of this group high in the hadron spectra. Such
type of multiplets is naturally explained within the string picture of
confinement. It also supports the scenario that the $U(1)_A$ breaking is
related to instantons and not to the gluonic interaction responsible for
confinement.


title: Phenomenological Constraints on Extended Quark Sectors

abstract:
  We study the flavor physics in two extensions of the quark sector of the
Standard Model (SM): a four generation model and a model with a single
vector--like down--type quark (VDQ). In our analysis we take into account the
experimental constraints from tree--level charged current processes, rare Kaon
decay processes, rare B decay processes, the $Z\to b \bar{b}$ decay, $K$, $B$
and $D$ mass differences, and the CP violating parameters $\frac
\epsilon^\prime}{\epsilon}$, $\epsilon_K$ and $a_{\psi K}$. All the constraints
are taken at two sigma. We find bounds on parameters which can be used to
represent the New Physics contributions in these models ($\lambda_{t^
\prime}^{bd}$, $\lambda_{t^ \prime}^{bs}$ and $\lambda_{t^ \prime}^{sd}$ in the
four--generation model, and $U_{bd}$, $U_{bs}$ and $U_{sd}$ in the VDQ model)
due to all the above constraints. In both models the predicted ranges for
$a_{SL}$ (the CP asymmetry in semi-leptonic decays), $\Delta M_D$,
$B(K^+\to\pi^+ \nu \bar{\nu})$, $B(K_L\to\pi^0 \nu \bar{\nu})$ and $B(K_L\to
\mu \bar{\mu})_{SD}$ can be significantly higher than the predictions of the
SM, while the allowed ranges for $a_{\psi K}$ and for $\Delta m_{B_S}$ are
consistent with the SM prediction.


title: Polarized Photon Structure: $g_1^\gamma$ and $g_2^\gamma$

abstract:
  We investigate the polarized photon structure functions $g_1^\gamma$ and
$g_2^\gamma$ which can be studied in the future polarized version of ep or
e$^+$e$^-$ colliders. The NLO QCD calculations of $g_1^\gamma$ and the possible
twist-3 effects in $g_2^\gamma$ are discussed.


title: CP Violation and the Search for New Physics

abstract:
  We present an overview of CP violation in the Standard Model and Beyond,
describing various possible sources of CP violation and how to search for them.


title: Supersymmetric effects in B_s \to \ell^+ \ell^- \gamma decays

abstract:
  B-meson decays are very useful probes for testing the Standard Model and its
various extensions. Leptonic decays of B have very clean signatures in this
respect and hence can be very useful testing grounds. In this work we study the
effects of MSSM (Minimal Supersymmetric Extension of Standard Model) on various
kinematical distributions in the radiative dileptonic decay (\bsllg). We study
the Forward Backward asymmetry (of the lepton pair), and the various
polarization asymmetries of both final state leptons ($\ell^-$ and $\ell^+$).
In radiative dileptonic decay of B-meson (\bsllg) the final state photon can
also be polarized. So in this channel one can also study the polarization
effects of the final state photon.


title: The cosmological gravitino problem in the context of R-parity violation

abstract:
  Based on the R-parity violation option of the minimal supersymmetric Standard
Model, we examine the scenario where the massive gravitino, relic from the hot
big-bang, is the lightest supersymmetric particle and can decay through one or
several of the trilinear R-parity violating interactions. We calculate the
rates of the gravitino decay via the various three-body decay channels with
final states involving three quarks and/or leptons. By taking into account the
present constraints on the trilinear R-parity violating coupling constants and
assuming the gravitino and scalar superpartner masses do not exceed $\sim 80
TeV$, it turns out that the gravitinos could easily have decayed before the
present epoch but not earlier than the big-bang nucleosynthesis one. Therefore,
the considered scenario would upset the standard big-bang nucleosynthesis and
we conclude that it does not seem to constitute a natural solution for the
cosmological gravitino problem.


title: Time varying gauge couplings and di-nucleon states

abstract:
  In this talk we discuss the effect upon the di-proton, di-neutron and
deuteron of a time variation of the QCD gauge coupling. We describe how a time
evolution of the size of extra dimensions can give rise to such a variation and
show how this is related to the recent results on possible time variation of
the electromagnetic fine structure constant. Based on work in collaboration
with Tom Dent.


title: Constructing Confinement

abstract:
  The interaction between static quarks is derived by applying many-body
techniques to QCD in Coulomb gauge. The result is shown to be exact in the IR
and UV limits, and agrees remarkably well with lattice computations.