title:
New method for calculating helicity amplitudes of jet--like QED
  processes for high--energy colliders I. Bremsstrahlung processes

abstract:
  Inelastic QED processes, the cross sections of which do not drop with
increasing energy, play an important role at high-energy colliders. Such
reactions have the form of two-jet processes with the exchange of a virtual
photon in the t-channel. We consider them in the region of small scattering
angles $m/E \lesssim \theta \ll 1$, which yields the dominant contribution to
their total cross sections. A new effective method is presented and applied to
QED processes with emission of real photons to calculate the helicity
amplitudes of these processes. Its basic idea is similar to the well-known
equivalent-lepton method. Compact analytical expressions for those amplitudes
up to $e^8$ are derived omitting only terms of the order of $m^2/E^2,
\theta^2$, $\theta m/E$ and higher order. The helicity amplitudes are presented
in a compact form in which large compensating terms are already cancelled. Some
common properties for all jet-like processes are found and we discuss their
origin.


title:
Angular distribution analysis of $B \to J/\psi K^{*}$ and resolving
  discrete ambiguities in the determination of $\phi_1$

abstract:
  We discuss the angular distribution analysis of $B\to J/\psi K^{*}$ decays
and a way to resolve discrete ambiguites in the determination of the unitary
triangle $\phi_1(=\beta)$. We study the status of factorization hypothesis in
the color-suppressed B meson decays: $B\to J/\psi K^{(*)}$ within the general
factorization approach and QCD-factorization method.


title: Recursive actions for scalar theories

abstract:
  We introduce a class of self-interacting scalar theories in which the various
coupling contants obey a recursive relation. These imply a particularly simple
form for the generating function of the Feynman amplitudes with vanishing
external momenta, as well as for the effective potential. In addition we
discuss an interesting duality inherent in these models. Specializing to the
case of zero spacetime dimensions we find intriguing nullification properties
for the amplitudes.


title:
Evidence for Colour-Octet Mechanism from CERN LEP2 gamma gamma -> J/psi
  + X Data

abstract:
  We present theoretical predictions for the transverse-momentum distribution
of J/psi mesons promptly produced in gamma gamma collisions within the
factorization formalism of nonrelativistic quantum chromodynamics, including
the contributions from both direct and resolved photons, and we perform a
conservative error analysis. The fraction of J/psi mesons from decays of
bottom-flavoured hadrons is estimated to be negligibly small. New data taken by
the DELPHI Collaboration at LEP2 nicely confirm these predictions, while they
disfavour those obtained within the traditional colour-singlet model.


title: The String CP Problem

abstract:
  We show that string models with low energy supersymmetry which accommodate
the fermion mass hierarchy generally give non-universal soft trilinear
couplings (A-terms). In conjunction with the apparently large
Cabibbo-Kobayashi-Maskawa (CKM) phase, this results in large fermion EDMs even
in the absence of CP violating phases in the supersymmetry breaking terms and
the mu-term. Nonobservation of the EDMs therefore implies that strings select
special flavor and/or supersymmetry breaking patterns.


title: Non-Gaussianity from Inflation

abstract:
  Correlated adiabatic and isocurvature perturbation modes are produced during
inflation through an oscillation mechanism when extra scalar degrees of freedom
other than the inflaton field are present. We show that this correlation
generically leads to sizeable non-Gaussian features both in the adiabatic and
isocurvature perturbations. The non-Gaussianity is first generated by large
non-linearities in some scalar sector and then efficiently transferred to the
inflaton sector by the oscillation process. We compute the cosmic microwave
background angular bispectrum, providing a characteristic feature of such
inflationary non-Gaussianity,which might be detected by upcoming satellite
experiments.


title:
Transverse Momentum Dependence of Intercept Parameter \lambda of
  Two-Pion (-Kaon) Correlation Functions in q-Bose Gas Model

abstract:
  Within recently proposed approach aimed to effectively describe the observed
non-Bose type behavior of the intercept \lambda of two-particle correlation
function C(p,K) of identical pions or kaons detected in heavy-ion collisions,
the q-deformed oscillators and q-Bose gas picture are employed. For the
intercept \lambda, connected with deformation parameter q, the model predicts a
fully specified dependence of \lambda on pair mean momentum {\bf K}. The
intercepts \lambda_\pi and \lambda_K for pions and kaons, differing noticeably
at small {\bf K}, should merge at {\bf K} large enough, i.e., in the range
|{\bf K}| \ge 800 MeV/c, where the effect of resonance decays is negligible. In
this paper we confront, fixing q appropriately, the predicted dependence
\lambda_\pi=\lambda_\pi({\bf K}) with recent results from STAR/RHIC for
\pi^-\pi^- and \pi^+\pi^+ pairs, and find nice agreement. Using the same q, we
also predict behavior of \lambda for kaons.


title: Heavy-Exotic-Leptons at LHC

abstract:
  We investigate the production, signatures and backgrounds of a pair of
heavy-exotic charged leptons and a heavy-exotic neutrino together with the
exotic charged lepton in the framework of the vector singlet model, vector
doublet model, and fermion-mirror-fermion model, at the CERN Large Hadron
Collider (LHC). We still show that the cross-sections for the case of the
production of a pair of heavy exotic leptons are competitive with the ones for
the single production of exotic leptons.


title: Semileptonic b --> u decays: lepton invariant mass spectrum

abstract:
  We compute O(alpha_s^2) QCD corrections to the lepton invariant mass spectrum
in the decay b --> u l nu_l, relevant for the determination of the CKM matrix
element |V_{ub}|. Our method can also be used to evaluate moments of the lepton
energy distribution with an O(alpha_s^2) accuracy. The abelian part of our
result gives the neutrino invariant mass spectrum in the muon decay and, upon
integration, the O(alpha^2) correction to the muon lifetime.


title: From Regge Behavior to DGLAP Evolution

abstract:
  We study the interface between Regge behavior and DGLAP evolution in a
non-perturbative model for the nucleon structure function based on a multipole
pomeron exchange. This model provides the input for a subsequent DGLAP
evolution that we calculate numerically. The soft input and its evolution give
a good fit to the experimental data in the whole available range of x and Q^2.


title: Vacuum Energy and the Cosmological Constant

abstract:
  We discuss a numerical relation between the cosmological constant and the
vacuum energy arising from the Casimir effect in extra dimensions


title: Expansion of bound state energies in powers of m/M and (1-m/M)

abstract:
  Elaborating on a previous letter, we use a new approach to compute energy
levels of a non-relativistic bound-state of two constituents, with masses m and
M, by systematic expansions - one in powers of m/M and another in powers of
(1-m/M). Technical aspects of the calculations are described in detail.
Theoretical predictions are given for O(alpha(Z*alpha)^5) radiative recoil and
O((Z*alpha)^6) pure recoil corrections to the average energy shift and
hyperfine splitting relevant for hydrogen, muonic hydrogen, and muonium.


title: Transverse Spin Effects In Diffractive Hadron Leptoproduction

abstract:
  We consider double spin asymmetries for longitudinally polarized leptons and
transversely polarized protons in diffractive vector meson and $Q \bar Q$
production at high energies within the two-gluon model. The asymmetry predicted
for meson production is quite small. The $A_{lT}$ asymmetry for $Q \bar Q$
production contains two independent terms which are large and can be used to
obtain information on the polarized gluon distributions in the proton.


title: Quark number susceptibilities from lattice QCD

abstract:
  Results from our recent investigations of quark number susceptibilities in
both quenched and 2-flavour QCD are presented as a function of valence quark
mass and temperature. A strong reduction (approx. 40%) is seen in the strange
quark susceptibility above T_c in both the cases. A comparison of our isospin
susceptibility results with the corresponding weak coupling expansion reveals
once again the non-perturbative nature of the plasma up to 3T_c. Evidence
relating the susceptibility to another non-perturbative phenomena, pionic
screening lengths, is presented.


title: Probing New Scales at a e+e- Linear Collider

abstract:
  Extending the sensitivity to New Physics beyond the anticipated reach of the
LHC is a prime aim of future colliders. This paper summarises the potential of
an e+e- linear collider, at and beyond 1 TeV, using a realistic simulation of
the detector response and the accelerator induced background. The possible LC
energy-luminosity trade-offs offered in probing multi-TeV scales for new
phenomena with electro-weak observables are also discussed.


title: The (muon^-,muon^+) conversion in nuclei as a probe of new physics

abstract:
  A detailed study of the muonic analogue of neutrinoless double beta decay,
(muon^-,muon^+) conversion, has been carried out for the A=44 nuclear system.
We studied several lepton number violating (LNV) mechanisms potentially
triggering this process: exchange by light and heavy Majorana neutrinos as well
as exchange by supersymmetric particles participating in R-parity violating
interactions. The nuclear structure has been taken into account within the
renormalized Quasiparticle Random Phase Approximation method. To our knowledge,
this is the first realistic treatment of nuclear structure aspects of the
(muon^-,muon^+) conversion. We estimated the rate of this process utilizing the
existing experimental constraints on the parameters of the underlying LNV
interactions and conclude that the (muon^-,muon^+) conversion is hardly
detectable in the near future experiments.


title: Distinguishing the neutrinoless double beta decay mechanisms

abstract:
  Many new neutrinoless double beta decay (0nbb) experiments are planned or in
preparation. If the 0nbb-decay will be detected, the key issue will be what is
the dominant mechanism of this process. By measuring only transitions to the
ground state one can not distinguish among many of the 0nbb-decay mechanisms
(the light and heavy Majorana neutrino exchange mechanisms, the trilinear
R-parity breaking mechanisms etc.). We show that if the ratio of the 0nbb-decay
half-lifes for transitions to the 0^+ first excited and ground states is
determined both theoretically and experimentally, it might be possible to
determine, which 0nbb-decay mechanisms is dominant. For that purpose the
corresponding nuclear matrix elements have to be evaluated with high
reliability. The present work is giving strong motivations for experimental
studies of the 0nbb-decay transitions to the first excited 0^+ states of the
final nuclei.


title:
SUSY Scalar Production in the Electroweak Sudakov Regime of Lepton
  Colliders

abstract:
  We consider the production of SUSY scalar pairs at lepton colliders, for c.m.
energies much larger than the mass of the heaviest SUSY (real or virtual)
particle involved in the process. In that energy regime, we derive the leading
and subleading terms of the electroweak Sudakov logarithms in the MSSM, first
working at one loop with physical states and then resumming to all orders with
asymptotic expansions. We show that the first order of the resummed expression
reproduces the physical one loop approximation, and compute systematically the
possible effects on various observables both at one loop and to all orders. We
discuss the regimes and the processes where the one loop approximation can or
cannot be trusted, working in an energy range between 1 TeV and 4 TeV under a
"light" SUSY mass assumption. As a byproduct of our analysis, we propose a
determination of the MSSM parameter tan(beta) showing how a relative accuracy
of about 25 percent can be easily achieved in the region tan(beta)>14, under
reasonable experimental assumptions.


title: The handbag contribution to gamma gamma to pi pi and K K

abstract:
  We investigate the soft handbag contribution to two-photon annihilation into
pion or kaon pairs at large energy and momentum transfer. The amplitude is
expressed as a hard gamma gamma -> q qbar subprocess times a form factor
describing the soft transition from q qbar to the meson pair. We find the
calculated angular dependence of the cross section in good agreement with data,
and extract annihilation form factors of plausible size. A key prediction of
the handbag mechanism is that the differential cross section is the same for
charged and neutral pion pairs, in striking contrast with what is found in the
hard scattering approach.


title: Describing F_2 through a finite sum of gluon ladders

abstract:
  Electroproduction in deep inelastic scattering at HERA is studied in a model
considering a finite sum of gluon ladders, associated with a truncation of the
BFKL series. The approach contains the bare two gluon exchange and both one and
two rungs contributions. The model is fitted to the data on the inclusive
structure function F_2(x,Q^2) in the region x<0.025 and 0.045<Q^2<1500 GeV^2,
with a good agreement. Such a description for a large span in Q^2 is obtained
through a suitable modeling of the remaining non-perturbative background.


title:
Next-to-Leading Order QCD Corrections to the Polarized Hadroproduction
  of Heavy Flavors

abstract:
  We present the complete next-to-leading order QCD corrections to the
polarized hadroproduction of heavy flavors which soon will be studied
experimentally in polarized pp collisions at the BNL RHIC in order to constrain
the polarized gluon density Delta g. It is demonstrated that the dependence on
unphysical renormalization and factorization scales is strongly reduced beyond
the leading order. The sensitivity of the heavy quark spin asymmetry to Delta g
is studied, including the limited detector acceptance for experimentally
observable leptons from heavy quark decays at the BNL RHIC. As a further
application of our results, gluino pair production in polarized pp collisions
is briefly discussed.


title: Neutrino mediated muon--electron conversion in nuclei revisited

abstract:
  The non-photonic neutrino exchange mechanism of the lepton flavor violating
muon-electron conversion in nuclei is revisited. First we determine the nucleon
coupling constants for the neutrino exchange mechanism in a relativistic quark
model taking into account quark confinement and chiral symmetry requirements.
This includes a new, previously overlooked tree-level contribution from
neutrino exchange between two quarks in the same nucleon. Then for the case of
an additional sterile neutrino we reconsider the coherent mode of this process.
The presence of a mixed sterile-active neutrino state heavier than the quark
confinement scale Lambda_c (~1 GeV) may significantly improve the prospects for
observation of this process in future experiments as compared to the
conventional scenario with only light neutrinos. Turning the arguments around
we derive new experimental constraints on |U_(mu h)| and |U_(e h)| mixing
matrix elements from the non-observation of muon--electron conversion.


title: micrOMEGAs: A program for calculating the relic density in the MSSM

abstract:
  We present a code that calculates the relic density of the LSP in the MSSM.
All tree-level processes for the annihilation of the LSP are included as well
as all possible coannihilation processes with neutralinos, charginos,
sleptons,squarks and gluinos. In all we have included over 2800 processes not
counting charged conjugate states.The cross-sections extracted from CompHEP are
calculated exactly. Relativistic formulae for the thermal average are used and
care is taken to handle poles and thresholds by adopting specific integration
routines. The input parameters can be either the soft SUSY parameters in a
general MSSM or the five parameters of a SUGRA model. A link with
ISASUGRA/ISAJET allows to calculate the parameters of the MSSM at the weak
scale for an input at the GUT scale. The Higgs masses are calculated with
FeynHiggsFast. Routines calculating g-2 and bsgamma are also included.


title: Time-varying coupling strengths, nuclear forces and unification

abstract:
  We investigate the dependence of the nucleon-nucleon force in the deuteron
system on the values of coupling strengths at high energy, which will in
general depend on the geometry of extra dimensions. The stability of deuterium
at all times after nucleosynthesis sets a bound on the time variation of the
ratio of the QCD confinement scale to light quark masses. We discuss the
relation between this ratio, which is exponentially sensitive to high-energy
couplings, and fundamental parameters, in various classes of unified theory.
The binding energy of the deuteron is also expected to have an important effect
on nucleosynthesis and we quantify this effect.


title: Can SUSY be found at the Tevatron Run II ?

abstract:
  Searches for SUSY particles are the main physics focus of the ongoing Run IIa
of the Tevatron. LEP results have constrained heavily the Minimal
Supersymmetric Standard Model. In this paper the results obtained at LEP and
the Tevatron Run I are analysed within two consistent scenarios: the
gravity-mediated MSSM framework and the minimal SUGRA scenario. In these
frameworks limits much beyond the kinematic reach of LEP are set, and the
allowed mass range for particles which are not directly observable at LEP is
explored. These results can be used to evaluate searches at the Tevatron Run
II. Both R-parity conserving and violating scenarios are considered.
Model-dependence and coverage of LEP results is discussed in view of searches
at the Tevatron Run II, and a conservative review of some of the other
constraints is given. Consequences of the light Higgs boson of the Minimal
Supersymmetric Standard Model with mass close to 114-117 GeV and branching
ratio to b bar b consistent with the one expected in the Standard Model are
examined.


title: Rescattering and chiral dynamics in B\to \rho\pi decay

abstract:
  We examine the role of B^0(\bar B^0) \to \sigma \pi^0 \to \pi^+\pi^- \pi^0
decay in the Dalitz plot analysis of B^0 (\bar B^0) \to \rho\pi \to
\pi^+\pi^-\pi^0 decays, employed to extract the CKM parameter \alpha. The
\sigma \pi channel is significant because it can break the relationship between
the penguin contributions in B\to\rho^0\pi^0, B\to\rho^+\pi^-, and
B\to\rho^-\pi^+ decays consequent to an assumption of isospin symmetry. Its
presence thus mimics the effect of isospin violation. The \sigma\pi^0 state is
of definite CP, however; we demonstrate that the B\to\rho\pi analysis can be
generalized to include this channel without difficulty. The \sigma or
f_0(400-1200) ``meson'' is a broad I=J=0 enhancement driven by strong \pi\pi
rescattering; a suitable scalar form factor is constrained by the chiral
dynamics of low-energy hadron-hadron interactions - it is rather different from
the relativistic Breit-Wigner form adopted in earlier B\to\sigma\pi and
D\to\sigma\pi analyses. We show that the use of this scalar form factor leads
to an improved theoretical understanding of the measured ratio Br(\bar B^0 \to
\rho^\mp \pi^\pm) / Br(B^-\to \rho^0 \pi^-).


title:
Evaporation of the gluon condensate: a model for pure gauge SU(3)_c
  phase transition

abstract:
  We interpret lattice data for the equation of state of pure gauge $SU(3)_c$
by an evaporation model. At low temperatures gluons are frozen inside the gluon
condensate, whose dynamics is described in terms of a dilaton lagrangian. Above
the critical temperature quasi-free gluons evaporate from the condensate: a
first order transition is obtained by minimizing the thermodynamical potential
of the system. Within the model it is possible to reproduce lattice QCD results
at finite temperature for thermodynamical quantities such as pressure and
energy. The gluonic longitudinal mass can also be evaluated; it vanishes below
the critical temperature, where it shows a discontinuity. At very large
temperatures we recover the perturbative scenario and gluons are the only
asymptotic degrees of freedom.


title: The NLO Jet Vertex for Mueller-Navelet and Forward Jets: the Quark Part

abstract:
  We calculate the next-to-leading corrections to the jet vertex which is
relevant for the Mueller-Navelet-jets production in p-pbar collisions and for
the forward jet cross section in e-p collisions. In this first part we present
the results of the vertex for an incoming quark. Particular emphasis is given
to the separation of the collinear divergent part and the central region of the
produced gluon.


title:
Correcting the Colour-Dipole Cascade Model with Fixed Order Matrix
  Elements

abstract:
  An algorithm is presented in which the Colour-Dipole Cascade Model as
implemented in the Ariadne program is corrected to match the fixed order
tree-level matrix elements for e+e- -> n jets. The result is a full parton
level generator for e+e- annihilation where the generated states are correct on
tree-level to fixed order in alpha_S and to all orders with modified leading
logarithmic (MLLA) accuracy. In this paper, matrix elements are used up to
second order in alpha_S, but the scheme is applicable also for higher orders.
An improvement to also include exact virtual corrections to fixed order is
suggested and the possibility to extend the scheme to hadronic collisions is
discussed.


title: Updated Analysis of Some Two-Body Charmless B Decays

abstract:
  New data from the BaBar, Belle, and CLEO Collaborations on B decays to
two-body charmless final states are analyzed, with the following consequences:
(1) The penguin amplitude which dominates the decay $B^+ \to \pi^+ K^{*0}$ has
a magnitude similar to that dominating $B^+ \to \pi^+ K^0$. (2) The decay $B^+
\to \pi^+ \eta$, a good candidate for observing direct CP violation, should be
detectable at present levels of sensitivity. (3) The decays $B^+ \to \eta' K^+$
and $B^+ \to \eta K^{*+}$ are sufficiently similar in rate to the corresponding
decays $B^0 \to \eta' K^0$ and $B^0 \to \eta K^{*0}$, respectively, that one
cannot yet infer the need for ``tree'' amplitudes $t'$ contributing to the
$B^+$ but not the $B^0$ decays. Statistical requirements for observing this and
other examples of tree-penguin interference are given. (4) Whereas the $B^+ \to
\eta' K^+$ and $B^0 \to \eta' K^0$ rates cannot be accounted for by the penguin
amplitude $p'$ alone but require an additional flavor-singlet penguin
contribution $s'$, no such flavor-singlet penguin contribution is yet called
for in the decays $B^+ \to \eta K^{*+}$ or $B^0 \to \eta K^{*0}$. Predictions
for the rates for $B^+ \to \eta' K^{*+}$ and $B^0 \to \eta' K^{*0}$ are given
which would allow one to gauge the importance of these flavor-singlet penguin
amplitudes.


title: Strong Symmetry Breaking at e+e- Linear Colliders

abstract:
  The study of strong symmetry breaking at an e+e linear collider with
sqrt(s)=0.5-1.5 TeV is reviewed. It is shown that processes such as e+e- --> nu
nubar W+ W-, e+e- --> nu nubar t tbar, and and e+e- --> W+ W- can be used to
measure chiral Lagrangian and strong resonance parameters. The linear collider
results are compared with those expected from the LHC.


title: Large Solar Neutrino Mixing in an Extended Zee Model

abstract:
  The Zee model, which employs the standard Higgs scalar ($\phi$) with its
duplicate ($\phi^\prime$) and a singly charged scalar ($h^+$), can utilize two
global symmetries associated with the conservation of the numbers of $\phi$ and
$\phi^\prime$, $N_{\phi,\phi^\prime}$, where $N_\phi+N_{\phi^\prime}$ coincides
with the hypercharge while $N_\phi-N_{\phi^\prime}$ ($\equiv X$) is a new
conserved charge, which is identical to $L_e-L_\mu-L_\tau$ for the left-handed
leptons. Charged leptons turn out to have $e$-$\mu$ and $e$-$\tau$ mixing
masses, which are found to be crucial for the large solar neutrino mixing. In
an extended version of the Zee model with an extra triplet Higgs scalar (s),
neutrino oscillations are described by three steps: 1) the maximal atmospheric
mixing is induced by democratic mass terms supplied by $s$ with $X$=2 that can
initiate the type II seesaw mechanism for the smallness of these masses; 2) the
maximal solar neutrino mixing is triggered by the creation of radiative masses
by $h^+$ with $X$ = 0; 3) the large solar neutrino mixing is finally induced by
a $\nu_\mu$-$\nu_\tau$ mixing arising from the rotation of the radiative mass
terms as a result of the diagonalization that converts $e$-$\mu$ and $e$-$\tau$
mixing masses into the electron mass.


title:
A study of single sneutrino production in association with fermion pairs
  at polarised photon colliders

abstract:
  We investigate single sneutrino production in the context of
R-parity-violating Supersymmetry at future $\gamma\gamma$ linear colliders. The
sneutrino is produced in association with fermion pairs and it is shown that
its decays into two further fermions will lead to a clean signal. We also
discuss possible backgrounds and the effects of beam polarisation.


title: Overview of Relativistic Heavy-Ion Physics

abstract:
  Selected topics in the field of relativistic heavy-ion collisions are
reviewed f rom the 15 year research programme at the SPS at CERN and the AGS at
BNL, and from the first run of the Relativistic Heavy-Ion Collider at BNL.


title:
Chiral Phase Transitions in QCD at Finite Temperature: Hard-Thermal-Loop
  Resummed Dyson-Schwinger Equation in the Real Time Formalism

abstract:
  Chiral phase transition in thermal QCD is studied by using the
Dyson-Schwinger (DS) equation in the real time hard thermal loop approximation.
Our results on the critical temperature and the critical coupling are
significantly different from those in the preceding analyses in the ladder DS
equation, showing the importance of properly taking into account the essential
thermal effects, namely the Landau damping and the unstable nature of thermal
quasiparticles.


title:
Dynamical symmetry breaking of massless $\lambda\phi^4$ and
  renormalization scheme dependence

abstract:
  Through two loop effective potential we demonstrate that the $\bar{MS}$
scheme of dimensional regularization and Jackiw's prescription in cut-off
regularization allow for the dynamical breaking solution in massless
$\lambda\phi^4$ theory, while the Coleman-Weinberg prescription does not. The
beta function of the broken phase is negative, like in the one loop effective
potential, but the UV fixed point is not zero, i.e., not an asymptotic freedom
solution, unlike the one loop case. Some related issues were briefly discussed.


title:
A mechanism for the Double-Spin Asymmetry in Electromagnetic $\rho$
  Production at HERMES

abstract:
  We calculate the contribution of meson and pomeron exchanges to the
double-spin asymmetry in $\rho$-meson electromagnetic production at HERMES
energies. We show that the observed double-spin asymmetries, which are large,
can be explained by the interference between the natural parity $f_2$-secondary
Reggeon and the unnatural parity anomalous $f_1$ exchanges.


title: HadAtom01

abstract:
  These are the proceedings of the workshop "HadAtom01", held at the Institut
fuer Theoretische Physik, Universitaet Bern, October 11 - 12, 2001. The main
topics discussed at the workshop were the physics of hadronic atoms and in this
context recent results in experiment and theory. Included here are the list of
participants, the scientific program and a short contribution from each
speaker.


title: A note on the baryonic B-->Lambdabar p eta' decay

abstract:
  In this short note we examine the exclusive three-body B --> Lambdabar p eta'
decay using a simple pole model involving a scalar intermediate resonance
state. Our aim is to test the recently formulated hypothesis that charmless
baryonic B decays could occur mainly in association with eta' or gamma.


title: CKM Matrix: Status and New Developments

abstract:
  An analysis of the CKM matrix parameters within the {\it R}fit approach is
presented using updated input values with special emphasis on the recent
$\sin{2\beta}$ measurements from BABAR and Belle. The QCD Factorisation
Approach describing $B \to \pi\pi,K\pi$ decays has been implemented in the
software package CKMfitter. Fits using branching ratios and CP asymmetries are
discussed.


title: Lectures on Chiral Disorder in QCD

abstract:
  I explain the concept that light quarks diffuse in the QCD vacuum following
the spontaneous breakdown of chiral symmetry. I exploit the striking analogy to
disordered electrons in metals, identifying, among others, the universal regime
described by random matrix theory, diffusive regime described by chiral
perturbation theory and the crossover between these two domains.


title:
On the energy and baseline optimization to study effects related to the
  $\delta$-phase (CP-/T-violation) in neutrino oscillations at a Neutrino
  Factory

abstract:
  In this paper we discuss the detection of CP and T-violation effects in the
framework of a neutrino factory. We introduce three quantities, which are good
discriminants for a non vanishing complex phase ($\delta$) in the $3\times 3$
neutrino mixing matrix. We find that these three discriminants (in vacuum) all
scale with $L/E_{\nu}$. Matter effects modify the scaling, but these effects
are large enough to spoil the sensitivity only for baselines larger than 5000
km. So, in the hypothesis of constant neutrino factory power, the sensitivity
on the $\delta$-phase is independent of the baseline chosen. Specially
interesting is the direct measurement of T-violation from the ``wrong-sign''
electron channel, which involves a comparison of the $\nue\ra\numu$ and
$\numu\ra\nue$ oscillation rates. However, the $\numu\ra\nue$ measurement
requires magnetic discrimination of the electron charge, experimentally very
challenging in a neutrino detector: low-energy neutrino beams and hence short
baselines, are preferred. In this paper we show the exclusion regions in the
$\Delta m^2_{12} - \delta$ plane for two concrete cases. We obtain a similar
excluded region provided that the electron detection efficiency is $\sim$20%
and the charge confusion 0.1%. The $\Delta m^2_{12}$ compatible with the LMA
solar data can be tested with a flux of 5$\times 10^{21}$ muons. We compare
these results with the fit of the visible energy distributions.


title: Ultra high energy cosmic rays: clustering, GUT scale and neutrino masses

abstract:
  The clustering of ultra high energy (above 5\cdot 10^{19} eV) cosmic rays
(UHECR) suggests that they might be emitted by compact sources. We present a
statistical analysis on the source density based on the multiplicities. The
propagation of UHECR protons is studied in detail. The UHECR spectrum is
consistent with the decay of GUT scale particles and/or with the Z-burst. The
predicted GUT mass is m_X=10^b GeV, where b=14.6_{-1.7}^{+1.6}. Our neutrino
mass prediction depends on the origin of the power part of the spectrum:
m_\nu=2.75^{+1.28}_{-0.97} eV for halo and 0.26^{+0.20}_{-0.14} eV for
extragalactic (EG) origin.


title: Pion gas viscosity at low temperature and density

abstract:
  By using Chiral Perturbation Theory and the Uehling-Uhlenbeck equation we
compute the viscosity of a pion gas, in the low temperature and low density
regime, in terms of the temperature, and the pion fugacity. The viscosity turns
out to be proportional to the squared root of the temperature over the pion
mass. Next to leading corrections are proportional to the temperature over the
pion mass to the 3/2.


title:
Improved Model-Independent Analysis of Semileptonic and Radiative Rare B
  Decays

abstract:
  We update the branching ratios for the inclusive decays $B\to X_s \ell^+
\ell^-$ and the exclusive decays $B\to (K,K^*) \ell^+ \ell^-$, with $\ell=e,
\m$, in the standard model by including the explicit $O(\a_s)$ and
$\Lambda_{\hbox{\tiny QCD}} / m_b$ corrections. This framework is used in
conjunction with the current measurements of the branching ratios for $B\to X_s
\g$ and $B\to K \ell^+ \ell^-$ decays and upper limits on the branching ratios
for the decays $B\to (K^*,X_s) \ell^+ \ell^-$ to work out bounds on the Wilson
coefficients $C_7$, $C_8$, $C_9$ and $C_{10}$ appearing in the effective
Hamiltonian formalism. The resulting bounds are found to be consistent with the
predictions of the standard model and some variants of supersymmetric theories.
We illustrate the constraints on supersymmetric parameters that the current
data on rare B decays implies in the context of minimal flavor violating model
and in more general scenarios admitting additional flavor changing mechanisms.
Precise measurements of the dilepton invariant mass distributions in the decays
$B \to (X_s,K^*,K) \ell^+ \ell^-$, in particular in the lower dilepton mass
region, and the forward-backward asymmetry in the decays $B \to (X_s,K^*)
\ell^+ \ell^-$, will greatly help in discriminating among the SM and various
supersymmetric theories.


title:
Renormalization of the soft SUSY breaking terms in the strong Yukawa
  coupling limit in the NMSSM

abstract:
  In the strong Yukawa coupling limit the renormalization of trilinear
couplings $A_i(t)$ and combinations of the scalar particle masses
$\mathfrak{M}_i^2(t)$ are studied in the framework of the Next--to--Minimal
SUSY Model. The dependence of given parameters on their initial values at the
Grand Unification scale disappears when the solutions of the renormalization
group equations approach the infrared quasi fixed points. Besides that at
$\tilde{\alpha}_{\text{GUT}}\ll Y_i(0)\ll 1$ in the vicinity of quasi fixed
points $A_i(t)$ and $\mathfrak{M}_i^2(t)$ concentrated near lines or surfaces
in the soft SUSY breaking parameter space. It occurs because the dependence of
trilinear couplings and combinations of scalar particle mass on $A_i(0)$ and
$\mathfrak{M}_i^2(0)$ disappears rather weakly. We propose a method which
enables to obtain equations for such lines and surfaces. Their origin is also
discussed by means of exact and approximate solutions of the NMSSM
renormalization group equations.


title: Old and new physics interpretations of the NuTeV anomaly

abstract:
  We discuss whether the NuTeV anomaly can be explained, compatibly with all
other data, by QCD effects (maybe, if the strange sea is asymmetric, or there
is a tiny violation of isospin), new physics in propagators or couplings of the
vector bosons (not really), loops of supersymmetric particles (no), dimension
six operators (yes, for one specific SU(2)-invariant operator), leptoquarks
(not in a minimal way), extra U(1) gauge bosons (maybe: an unmixed Z' coupled
to B-3L_mu also increases the muon g-2 by about 10^{-9} and gives a `burst' to
cosmic rays above the GZK cutoff).


title:
B_d-Bbar_d Mixing and the B_d -> J/psi K_s Asymmetry in General SUSY
  Models

abstract:
  We present a next-to-leading order determination of the gluino-mediated SUSY
contributions to B_d-Bbar_d mixing and to the CP asymmetry a_{J/psi K_s} in the
framework of the mass-insertion approximation. Using hadronic matrix elements
recently computed on the lattice, we obtain improved constraints on the
squark-mass splittings.


title: The Mikheyev-Smirnov-Wolfenstein Effect in Moving Matter

abstract:
  The Lorentz invariant formalism for description of neutrino flavour
oscillations in moving matter is developed. It is shown that the matter motion
with relativistic speed can sufficiently change the matter term in the neutrino
effective potential. In the case of matter motion parallel to neutrino
propagation, matter effects in neutrino flavour oscillations are suppressed. In
the case of relativistic motion of matter in the opposite direction in respect
to neutrino propagation, sufficient increase of effects of matter in neutrino
oscillations is predicted. The effective neutrino flavour oscillation
probability, effective mixing angle and oscillation length, as well as the MSW
effect resonance condition for the case of moving matter are derived.


title:
QCD Corrections to B -> X_{d,s} nu nubar, B_{d,s} -> l^+l^-, K -> pi nu
  nubar and K_L -> mu^+ mu^- in the MSSM

abstract:
  We compute for the first time QCD corrections to the rare decays B -> X_{d,s}
nu nubar, B_{d,s} -> l^+ l^-, K -> pi nu nubar and K_L -> mu^+ mu^-, where l=e
or mu, in the context of a supersymmetric extension of the Standard Model (SM)
with minimal flavour violation and new operators, in addition to those present
in the SM. Assuming that the gluino is heavy, we consider an effective theory
which consists of charged and neutral Higgs particles, charginos and squarks.
We evaluate the QCD corrections to box and Z^0-penguin diagrams with top-quark,
charged Higgs boson, chargino and squark exchanges, as well as to neutral Higgs
boson penguin diagrams. We provide a compendium of analytic formulae for the
Wilson coefficients, which are valid for arbitrary values of tan(beta) (the
ratio of the vacuum expectation values of the two Higgs fields) except for the
case of the neutral Higgs-boson contributions. These contributions have been
obtained at large tan(beta), which may compensate for the inevitable
suppression by the masses of the light leptons in decays based on the b -> s
(d) l^+ l^- transition. We investigate the dependence of the various branching
ratios on the renormalization scale mu, which is the main theoretical
uncertainty in the short-distance calculation. We find that the mu dependence
of the branching ratios is considerably reduced once the QCD corrections are
taken into account. The contributions of new operators are found to be dominant
at large tan(beta) in B_{d,s} -> mu^+ mu^- while they are subleading in B ->
X_{d,s} nu nubar and completely negligible in kaon decays.


title: Differential Distributions for NLO Neutrino-Production of Charm

abstract:
  Charged current DIS charm production measures the strange-quark PDF. A
complete analysis requires both a fully differential theoretical calculation,
and a Monte Carlo detector simulation. We present analytic and numeric results
at NLO suitable for experimental analysis.


title: PDF's: What Do We Need To Know?

abstract:
  Reliable knowledge of parton distribution functions is crucial for many
searches for new physics signals in the next generation of experiments.
Presently, there remain a number of open questions regarding the PDF's and
their uncertainties. We briefly discuss these issues, and consider aspects
where a future high-precision fixed-target experiment might contribute.


title: Photon and dilepton emission rates from high density quark matter

abstract:
  We compute the rates of real and virtual photon (dilepton) emission from
dense QCD matter in the color-flavor locked (CFL) phase, focusing on results at
moderate densities (3-5 times the nuclear saturation density) and temperatures
$T\simeq80$ MeV. We pursue two approaches to evaluate the electromagnetic
(e.m.) response of the CFL ground state: (i) a direct evaluation of the photon
self energy using quark particle/-hole degrees of freedom, and (ii) a Hidden
Local Symmetry (HLS) framework based on generalized mesonic excitations where
the $\rho$ meson is introduced as a gauge boson of a local SU(3) color-flavor
group. The $\rho$ coupling to generalized two-pion states induces a finite
width and allows to address the issue of vector meson dominance (VMD) in the
CFL phase. We compare the calculated emissivities (dilepton rates) to those
arising from standard hadronic approaches including in-medium effects. For
rather large superconducting gaps (several tens of MeV at moderate densities),
as suggested by both perturbative and nonperturbative estimates, the dilepton
rates from CFL quark matter turn out to be very similar to those obtained in
hadronic many-body calculations, especially for invariant masses above
$M\simeq0.3$ GeV. A similar observation holds for (real) photon production.


title: Physics at the Light-Front

abstract:
  The light-front representation of quantum chromodynamics provides a
frame-independent, quantum-mechanical representation of hadrons at the
amplitude level, capable of encoding their multi-quark, hidden-color and gluon
momentum, helicity, and flavor correlations in the form of universal
process-independent hadron wavefunctions. The universality and
frame-independence of the LCWF's thus allow a profound connection between
diffractive dissociation, hard scattering exclusive processes such as elastic
form factors, two-photon reactions, and heavy hadron decays. In this concluding
talk of the ECT* International Conference On Light-Cone Physics: Particles And
Strings (Trento 2001), I review recent calculations and new applications of
light-front wavefunctions in QCD and other theories. I also review the
distinction between the structure functions measured in deep inelastic lepton
scattering and the quark distributions determined from light-front
wavefunctions.


title: Status of a hybrid three-neutrino interpretation of neutrino data

abstract:
  We reanalyze the non-standard interaction (NSI) solutions to the solar
neutrino problem in the light of the latest solar, atmospheric and reactor
neutrino data. We show that such solutions, although preferred by the solar
data and consistent with the oscillation description of the atmospheric
neutrino data, are ruled out by the first results of the KamLAND reactor
experiment, at more than 3_sigma.


title: The path from chemical to thermal freeze-out

abstract:
  The evolution of a hadronic system after its chemical decomposition is
described through a model that conserves the hadronic multiplicities to their
values at chemical freeze-out. The state of the system is found as function of
temperature and the corresponding baryon density is evaluated. The baryon
density at thermal decoupling is also computed.


title: Indirect Investigations of Supersymmetry

abstract:
  This is the summary report of the ``Indirect Investigations of SUSY''
subgroup of the P3 Physics Group at Snowmass 2001.


title: Physics at Multi-TeV Linear Colliders

abstract:
  The physics at an e+e- linear collider with a center of mass energy of 3-5
TeV is reviewed. The following topics are covered: experimental environment,
Higgs physics, supersymmetry, fermion pair-production, WW scattering, extra
dimensions, non-commutative theories, and black hole production.


title: Kinetic equation for gluons at the early stage

abstract:
  We derive the kinetic equation for pure gluon QCD plasma in a general way,
applying the background field method. We show that the quantum kinetic equation
contains a term as in the classical case, that describes a color charge
precession of partons moving in the gauge field. We emphasize that this new
term is necessary for the gauge covariance of the resulting equation.


title: Stability and experimental flux bound of Fermi Ball

abstract:
  We investigate the stability of an Fermi ball(F-ball) within the
next-to-leading order approximation in the thin wall expansion. We find out
that an F-ball is unstable in case that it is electrically neutral. We then
find out that an electrically charged F-ball is metastable in some parameter
range. We lastly discuss the allowed region of parameters of an F-ball, taking
into account the stability of an F-ball and results of experiments.


title: Some results from the NA27 Data

abstract:
  The self-affine analysis and erraticity analysis of pseudorapidity gaps are
performed for the data of 400GeV/$c$ pp collisions. The self-affine analysis
has been shown to exhibit a better scaling behavior. The self-affine
multifractal dimensions and multifractal spectrum have been obtained. The
simulated results using FRITIOF program can not reproduce the scaling behavior.
The analysis of event-to-event fluctuations has been performed. The increase of
event-space moments $C_{p,q}(M)$ with decreasing phase-space scale is dominated
by the statistical fluctuations. The erraticity analysis based on measuring the
pseudorapidity gaps is also performed. The entropy-like quantities $S_q$ and
$\Sigma_q$ deviate from 1 significantly, implying that both of them are useful
to serve as effective measures of erraticity in multiparticle production. The
ln${S_q}$ versus $q$ has a quite linear behavior, but the ln${\Sigma_q}$ versus
$q$ has only an approximate linear behavior. The FRITIOF simulated results
follow the same scaling behavior, but the deviations from the experimental data
are rather large.


title: Lanczos's equation to replace Dirac's equation ?

abstract:
  Lanczos's quaternionic interpretation of Dirac's equation provides a unified
description for all elementary particles of spin 0, 1/2, 1, and 3/2. The
Lagrangian formulation given by Einstein and Mayer in 1933 predicts two main
classes of solutions. (1) Point like partons which come in two families, quarks
and leptons. The correct fractional or integral electric and baryonic charges,
and zero mass for the neutrino and the u-quark, are set by eigenvalue
equations. The electro-weak interaction of the partons is the same as with the
Standard model, with the same two free parameters: e and sin^2 theta. There is
no need for a Higgs symmetry breaking mechanism. (2) Extended hadrons for which
there is no simple eigenvalue equation for the mass. The strong interaction is
essentially non-local. The pion mass and pion-nucleon coupling constant
determine to first order the nucleon size, mass and anomalous magnetic moment.


title: Electromagnetic Tests of Lorentz and CPT Symmetry

abstract:
  A review is presented of some recent Lorentz and CPT tests in atomic and
particle systems where the predominant interactions are described by quantum
electrodynamics. A theoretical framework extending QED in the context of the
standard model is used to analyze these systems. Experimental signatures of
possible Lorentz and CPT violation are investigated, and bounds are discussed.


title:
Solar Neutrino Zenith Angle Distribution and Uncertainty in Earth Matter
  Density

abstract:
  We estimate in this paper the errors in the zenith angle distribution for the
charged current events of the solar neutrinos caused by the uncertainty of the
earth electron density. In the model of PREM with a 5% uncertainty in the earth
electron density we numerically calculate the corrections to the correlation
between $ [N]_5 /[N]_2 $ and $ [N]_2 /[N]_3 $, and find the errors notable.


title: Triple Neutral Gauge Boson Couplings in Noncommutative Standard Model

abstract:
  It has been shown recently that the triple neutral gauge boson couplings are
not uniquely determined in noncommutative extension of the Standard Model
(NCSM). Depending on specific schemes used, the couplings are different and may
even be zero. To distinguish different realizations of the NCSM, additional
information either from theoretical or experimental considerations is needed.
In this paper we show that these couplings can be uniquely determined from
considerations of unification of electroweak and strong interactions. Using
SU(5) as the underlying theory and integrating out the heavy degrees of
freedom, we obtain unique non-zero new triple $\gamma\gamma\gamma$, $\gamma
\gamma Z$, $\gamma ZZ$, $ZZZ$, $\gamma GG$, $ZGG$ and $GGG$ couplings at the
leading order in the NCSM. We also briefly discuss experimental implications.


title:
Investigating the Supersymmetric Explanation of Anomalous CDF lepton(s)
  photon(s) Missing-E_T Events

abstract:
  The recent excess over the Standard Model prediction in the \mu \gamma
missing-E_T channel reported by CDF can be well-explained by resonant smuon
production with a single dominant R-parity violating coupling \lambda'_{211},
in the context of models where the gravitino is the lightest supersymmetric
particle. The slepton decays to the lightest neutralino and a muon followed by
neutralino decaying to a gravitino and photon. The kinematical distributions
are fitted well by our hypothesis and we use them to constrain the available
parameter space. The model also provides an explanation for the ee\gamma\gamma
missing-E_T event observed in Run I of the Tevatron by the CDF experiment. Our
model predicts an excess of between 5 and 35 events in a \gamma missing-E_T
channel at Run I. We provide predictions for signatures expected by the model
at Run II.


title: Inequalities for generalized parton distributions H and E

abstract:
  New positivity bounds are derived for quark and gluon generalized parton
distributions $H$ and $E$ in spin 1/2 hadrons.


title: Global duality in heavy flavor hadronic decays

abstract:
  We show that heavy meson hadronic decay widths satisfy quark-hadron duality
when smeared over the heavy quark mass, M, to an accuracy of order 1/M^2.


title: Recent Results and Current Status of BES

abstract:
  The current status of BESII is reported.
  Some published results based on the data collected by BESI and some new
preliminary results based on the BESII data are reviewed in this paper.


title: Probabilistic model of Reggeon Field Theory

abstract:
  The stochastic model of classical system of particles (partons), which
dynamics includes random walk in plane as well as processes of death,
splitting, annihilation and fusion of partons, is considered. A set of
equations for multiparticle distribution functions for this system can be
described in terms of diagrams of the Reggeon Field Theory (RFT) with
supercritical pomeron, where rapidity plays a role of the time variable. The
multiparticle inclusive distributions of partons correspond to multi-pomeron
states in this analogy. In order to calculate the amplitude of hadron
interaction at given energy we define an operator of linkage of any pair of
partons from two parton sets (the projectile and the target). The form of the
hadron-interaction (parton-linkage) operator is determined from the requirement
for the result to be in correspondence to the RFT formulas. It is shown that
the requirement of Lorentz invariance of the amplitude is fulfilled in this
interpretation only at definite relation between the probabilities of parton
splitting, annihilation and fusion. Interpretation of various methods of
s-channel unitarization is discussed in terms of the model.


title: Gluon Chain Model of the Confining Force

abstract:
  We develop a picture of the QCD string as a chain of constituent gluons,
bound by attractive nearest-neighbor forces which may be treated
perturbatively. This picture accounts for both Casimir scaling at large N, and
the asymptotic center dependence of the static quark potential. We discuss the
relevance, to the gluon-chain picture, of recent three-loop results for the
static quark potential. A variational framework is presented for computing the
minimal energy and wavefunction of a long gluon chain, which enables us to
derive both the logarithmic broadening of the QCD flux tube (``roughening''),
and the existence of a Luscher -c/R term in the potential.


title: CP violation in long baseline neutrino oscillation experiments

abstract:
  We define a difference $D_{\rm CP}$ of the neutrino oscillation probability
differences with matter effect for the CP-conjugate channels, divided by
neutrino beam energy, taken between the two baselines $L = L_1$ and $L =L_2$
with $L_1/E_1 = L_2/E_2$, where $E_1$ and $E_2$ are the neutrino energy for the
experiment with $L_1$ and $L_2$, respectively. The quantity $D_{\rm CP}$
doesn't contain the matter effect to the first order in $aL/2E$, $a$
representing the matter effect. We show the behavior of $D_{\rm CP}$ with $L_1
= 300$ km fixed and $L_2$ variable in the three-neutrino model.


title:
Corrections to quarkonium 1S energy level at O(alpha_S^4 m) from
  non-instantaneous Coulomb vacuum polarization

abstract:
  We calculate O(alpha_S^4 m) and O(alpha_S^4 m log(alpha_S)) corrections to
the quarkonium 1S energy level analytically, which have been overlooked in
recent studies. These are the contributions from one Coulomb-gluon exchange
with the 1-loop vacuum polarization insertion. A part of the corrections was
computed numerically some time ago; we correct its error.


title: Oscillation enhanced search for new interaction with neutrinos

abstract:
  We discuss the measurement of new physics in long baseline neutrino
oscillation experiments. Through the neutrino oscillation, the probability to
detect the new physics effects such as flavor violation is enhanced by the
interference with the weak interaction. We carefully explain the situations
that the interference can take place. Assuming a neutrino factory and an
upgraded conventional beam, we estimate the feasibility to observe new physics
numerically and point out that we can search new interactions using some
channels, for example $\nu_{\mu} \to \nu_{\mu}$, in these experiments. We also
discuss several models which induce the effective interactions interfering with
the weak interaction, and show that some new physics effects are large enough
to be observed in the oscillation enhanced way.


title:
Orbitally excited D and B mesons in the approach of the QCD string with
  quarks at the ends

abstract:
  In this letter we discuss the masses and the splittings of 1(2S+1)P_J states
in the spectrum of D and B mesons, as they appear in the approach of the QCD
string with quarks at the ends. We find good agreement of our predictions with
those of other QCD-motivated models as well as with the lattice and
experimental data, including recent experimental results. We discuss the
ordering pattern for P levels in D- and B-mesonic spectrum.


title:
From soft to hard regime in elastic pion-pion scattering above
  resonances

abstract:
  We discuss the onset of the dominance of the Glauber-Gribov-Landshoff (GGL)
component of pQCD hard two-gluon (2G) exchange contribution to hard elastic
$\pi\pi$ scattering at moderate energies . Such a hard $\pi\pi$ scattering
could via final state interaction on the $\gamma \gamma \to \pi^+ \pi^-$
reaction in which pQCD quark-exchange contribution is known to be short of
strength. While in the nonrelativistic approximation the GGL amplitude is known
to be free of suppression by the pion form factor, we show that in the
relativistic light-cone approach it acquires a residual, albeit a weak,
suppression. Furthermore,z the same mechanism it is free of the end-point
contributions. We evaluation the GGL amplitude with a model light-cone wave
function consistent with the pion charge form factor data. The soft
contribution to elastic $\pi\pi$ scattering is estimated based on the $NN$ and
$\pi N$ total cross section data and Regge factorization, which gives the
$\pi\pi$ total cross sections consistent with the ones deduced earlier from the
absorption model analysis of the $\pi N \to X N, X \Delta$ data. We evaluate
the large-$|t|$ tail of the soft amplitude within the Regge absorption models.
We find that while in the same sign $\pi^\pm\pi^\pm$ scattering the hard GGL
mechanism takes over at $|t|\gsim$ 3 GeV$^{-2}$, in the opposite-sign
$\pi^\pm\pi^\mp$ scattering the hard GGL mechanism $|t|\lsim$ 4 GeV$^{-2}$.


title: Spin effects within the instanton model

abstract:
  Nonperturbative nolocal structure of QCD vacuum is well described by
instanton model. Specific helicity and flavor structure of zero modes of quarks
in instanton field allows simultaneously to explain some important features of
low- and high- energy hadron phenomemology. The basic characteristics of hadron
spectrum, partonic sum rules, heavy-quark potential are briefly discussed
within the instanton liquid model.


title: Future Low x Physics and Facilities

abstract:
  A brief overview is given on the physics and future lepton-nucleon collider
facilities to explore the domain of high parton densities at low Bjorken $x$,
with HERA, the electron-ion collider (EIC) and with THERA - in $ep$, polarised
$\overrightarrow{e} \overrightarrow{N}$ and $eA$ mode.


title: Determination of $\tan\beta$ at a Future $e^+e^-$ Linear Collider

abstract:
  It is widely stated that the ratio of neutral Higgs field vacuum expectation
values, $\tanb$, is one of the most difficult parameters to determine in either
the Minimal Supersymmetric Standard Model (MSSM) or a general type-II Two-Higgs
Doublet Model (2HDM). Assuming an energy and integrated luminosity of
$\rts=500\gev$ and $\call=2000\fbi$, we show that a very accurate determination
of $\tanb$ will often be possible using Higgs production rates and/or Higgs
decays. Based on a TESLA simulation, and assuming no other light Higgs bosons
and $100\leq m_A \leq 200\gev$, we find that the rate for the process $\epem\to
b\anti b A \to b\anti b b\anti b$ provides an excellent determination of
$\tanb$ at high $\tanb$. In the MSSM Higgs sector, the rate for $\epem\to
b\anti b A+ b\anti b H \to b\anti b b\anti b$ ($\epem\to HA \to b\anti b b\anti
b$) provides a good determination of $\tanb$ at high (low) $\tanb$,
respectively, at moderate $m_A$ values. We also show that direct measurement of
the average total width of the $H$ and $A$ in $\epem\to HA \to b\anti b b\anti
b$ events provides an excellent determination of $\tanb$ at large $\tanb$.


title: Cosmic Microwave Background Anisotropy with Late Time Entropy Production

abstract:
  We discuss effects of cosmological moduli fields on the cosmic microwave
background (CMB). If a modulus field \phi once dominates the universe, the CMB
we observe today is from the decay of \phi and its anisotropy is affected by
the primordial fluctuation in the amplitude of the modulus field. As a result,
constraints on the inflaton potential from the CMB anisotropy can be relaxed.
In addition, with the cosmological moduli fields, correlated mixture of
adiabatic and isocurvature fluctuations may be generated, which results in
enhanced CMB angular power spectrum at higher multipoles relative to that of
lower ones. Such an enhancement can be an evidence of late time entropy
production due to the cosmological moduli fields, and may be observed at
on-going and future experiments.


title:
CERN LEP2 constraint on 4D QED having dynamically generated spatial
  dimension

abstract:
  We study 4D QED in which one spatial dimension is dynamically generated from
3D action, following the mechanism proposed by Arkani-Hamed, Cohen and Georgi.
In this model, the generated fourth dimension is discretized by an interval
parameter $a$. We examine the phenomenological constraint on the parameter $a$
coming from the collider experiments on the QED process $e^+ e^- \to \gamma
\gamma$. It is found that the LEP2 experiments give the constraint of $1/a
\simgt 461\gev$. Expected bound on the same parameter $a$ at the future $e^+
e^-$ linear collider is briefly discussed.


title: n-nbar Oscillations in Models with Large Extra Dimensions

abstract:
  We analyze $n - \bar n$ oscillations in generic models with large extra
dimensions in which standard-model fields propagate and fermion wavefunctions
have strong localization. We find that in these models $n - \bar n$
oscillations might occur at levels not too far below the current limit.


title:
Prospects of Very Long Base-Line Neutrino Oscillation Experiments with
  the KEK-JAERI High Intensity Proton Accelerator

abstract:
  We study physics potential of Very Long Base-Line (VLBL) Neutrino-Oscillation
Experiments with the High Intensity Proton Accelerator (HIPA), which will be
completed by the year 2007 in Tokai-village, Japan, as a joint project of KEK
and JAERI (Japan Atomic Energy Research Institute). The HIPA 50 GeV proton beam
will deliver neutrino beams of a few GeV range with the intensity about two
orders of magnitude higher than the present KEK beam for K2K experiment. As a
sequel to the proposed HIPA-to-Super-Kamiokande experiment, we study impacts of
experiments with a 100 kton-level detector and the base-line length of a
few-thousand km. The pulsed narrow-band nu_mu beams (NBB) allow us to measure
the nu_mu to nu_e transition probability and the nu_mu survival probability
through counting experiments at large water-Cerenkov detector. We study
sensitivity of such experiments to the neutrino mass hierarchy, the
mass-squared differences, the three angles, and one CP phase of the
three-generation lepton-flavor-mixing matrix. We find that experiments at a
distance between 1,000 and 2,000 km can determine the sign of the larger
mass-squared difference (m_3^2-m_1^2) if the mixing between nu_e and nu_3 (the
heaviest-or-lightest neutrino) is not too small; 2|U_{e3}|^2(1-|U_{e3}|^2) gsim
0.03. The CP phase can be constrained if the |U_{e3}| element is sufficiently
large, 2|U_{e3}|^2(1-|U_{e3}|^2) gsim 0.06, and if the smaller mass-squared
difference (m_2^2-m_1^2) and the U_{e2} element are in the prefered range of
the large-mixing-angle solution of the solar-neutrino deficit. The magunitude |
m_3^2-m_1^2| and the matrix element U_{mu 3} can be precisely measured, but we
find little sensitivity to m_2^2-m_1^2 and the matrix element U_{e2}.


title: Cube or hypercube of natural units

abstract:
  Max Planck introduced four natural units: h, c, G, k. Only the first three of
them retained their status, representing the so called cube of theories, after
the theory of relativity and quantum mechanics were created and became the
pillars of physics. This short note is a little pebble on the tombstone of
Michael Samuilovich Marinov.


title: Quark-Lepton Masses and the Neutrino Puzzle in the AGUT Model

abstract:
  We first discuss an approach to the fermion mass problem, according to which
the whole of flavour mixing for quarks is determined by the mechanism
responsible for generating the physical masses of the up and down quarks: the
Lightest Flavour Mass Generation model. Then we consider fermion masses in the
Anti-grand Unification Theory and, in particular, the neutrino mass and mixing
problem.


title: Chiral thermodynamics in a magnetic field

abstract:
  We study thermodynamic properties of the QCD vacuum in a magnetic field below
chiral phase transition. The hadronic phase free energy in a constant
homogeneous magnetic field is calculated in the framework of the chiral
perturbation theory at non-zero pionic mass. It is demonstrated that the order
parameter of the chiral phase transition remains constant provided temperature
and magnetic field strength are related through obtained equation (the
phenomenon of ''quark condensate freezing'').


title: Gluon Interactions with Color-Neutral Fields

abstract:
  We investigate the interactions of color neutral fields with gluons in the
regge region, and propose a model in which the field strength of the gluons
couple to these fields. This model yields to first order in perturbation theory
a structure function which coincides with that obtained in deep inelastic
scattering (in the Double Log Approximation of QCD) to first order at low q
with a correction. We propose that higher order corrections in this model will
contribute to the parton structure functions beyond the DLA. It is also shown
that the Born approximation in this model yields a potential having a monopole,
and a quadruploe term that may couple to hadronic currents provideing angular
momentum transitions of Delta(J)=2,0, as is the case in hadron regge
trajectories.


title:
Radion Mixing Effects on the Properties of the Standard Model Higgs
  Boson

abstract:
  We examine how mixing between the Standard Model(SM) Higgs boson, $h$, and
the radion of the Randall-Sundrum model modifies the expected properties of the
Higgs boson. In particular, we demonstrate that the total and partial decay
widths of the Higgs, as well as the $h\to gg$ branching fraction, can be
substantially altered from their SM expectations, while the remaining Higgs
branching fractions are modified less than $\lsim 5%$ for most of the parameter
region.


title:
Self-tuning Solution of Cosmological Constant in RS-II Model and
  Goldstone Boson

abstract:
  I give a review on the self-tuning solution of the cosmological constant in a
5D RS-II model using a three index antisymmetric tensor field $A_{MNP}$. The
three index antisymmetric tensor field can be the fundamental one appearing in
11D supergravity. Also, the dual of its field strength $H_{MNPQ}$, being a
massless scalar, may be interpreted as a Goldstone boson of some spontaneously
broken global symmetry.


title:
Method for Determination of $|U_{e3}|$ in Neutrino Oscillation
  Appearance Experiments

abstract:
  We point out that determination of the MNS matrix element |U_{e3}| = s_{13}
in long-baseline \nu_{\mu} \to \nu_e neutrino oscillation experiments suffers
from large intrinsic uncertainty due to the unknown CP violating phase \delta
and sign of \Delta m^2_{13}. We propose a new strategy for accurate
determination of $\theta_{13}$; tune the beam energy at the oscillation maximum
and do the measurement both in neutrino and antineutrino channels. We show that
it automatically resolves the problem of parameter ambiguities which involves
\delta, \theta_{13}, and the sign of \Delta m^2_{13}.


abstract:
  We discuss DGLAP and BFKL evolution equations in the N=4 supersymmetric gauge
theory in the leading and next-to-leading approximations. Eigenvalues of the
BFKL kernel in this model turn out to be analytic functions of the conformal
spin. It allows us to find the residues of the anomalous dimensions of the
twist-2 operators in the points j=1,0,-1, ... from the BFKL equation in an
agreement with their direct calculation from the DGLAP equation. The
holomorphic separability of the BFKL kernel and the integrability of the DGLAP
dynamics in this model are also discussed.


title: Some methods for the evaluation of complicated Feynman integrals

abstract:
  We discuss a progress in calculations of Feynman integrals based on the
Gegenbauer Polynomial Technique and the Differential Equation Method. We
demonstrate the results for a class of two-point two-loop diagrams and the
evaluation of most complicated part of O(1/N^3) contributions to critical
exponents of \phi^4-theory. An illustration of the results obtained with help
of above methods is considered.


title: Beyond the Standard Model

abstract:
  The successes and shortcomings of the Standard Model are reviewed, with
emphasis on the reasons motivating the need to extend it. The basic elements of
grand unification and supersymmetry are described, exploring their
phenomenological implications for gauge coupling unification, proton decay,
fermion masses, neutrino physics, collider signatures, dark matter, rare decays
and anomalous magnetic moments. The forthcoming generation of experiments will
certainly expose these ideas to several essential tests.


title: New Variational Principles in Classical and Semiclassical Mechanics

abstract:
  We demonstrate that reciprocal Maupertuis' Principle is the classical limit
of Schr\"{o}dinger's Variational Principle in Quantum Mechanics.


title: Muon Decay Asymmetries from $K^0_L \to \pi^0 \mu^+ \mu^-$ Decays

abstract:
  We have examined the decay $K^0_L \to \pi^0 \mu^+ \mu^-$ in which the
branching ratio, the muon energy asymmetry and the muon decay asymmetry could
be measured. In particular, we find that within the Standard Model the
longitudinal polarization ($P_L$) of the muon is proportional to the direct CP
violating amplitude. On the other hand the energy asymmetry and the
out-of-plane polarization ($P_N$) depend on both indirect and direct CP
violating amplitudes. Although the branching ratio is small and difficult to
measure because of background, the asymmetries could be large $\cal{O}$(1) in
the Standard Model. A combined analysis of the energy asymmetry, $P_L$ and
$P_N$ could be used to separate indirect CPV, direct CPV, and CP conserving
contributions to the decay.


title:
Ultra-High Energy Cosmic Rays from Neutrino Emitting Acceleration
  Sources?

abstract:
  We demonstrate by numerical flux calculations that neutrino beams producing
the observed highest energy cosmic rays by weak interactions with the relic
neutrino background require a non-uniform distribution of sources. Such sources
have to accelerate protons at least up to 10^{23} eV, have to be opaque to
their primary protons, and should emit the secondary photons unavoidably
produced together with the neutrinos only in the sub-MeV region to avoid
conflict with the diffuse gamma-ray background measured by the EGRET
experiment. Even if such a source class exists, the resulting large
uncertainties in the parameters involved in this scenario does currently not
allow to extract any meaningful information on absolute neutrino masses.


title: K_l3 form factors at order p^6 in chiral perturbation theory

abstract:
  This paper describes the calculation of the semileptonic K_l3 decay form
factor at order p^6 of chiral perturbation theory which is the next-to-leading
order correction to the well-known p^4 result achieved by Gasser and Leutwyler.
At order p^6 the chiral expansion contains 1- and 2-loop diagrams which are
discussed in detail. The irreducible 2-loop graphs of the sunset topology are
calculated numerically. In addition, the chiral Lagrangian L^6 produces direct
couplings with the W-bosons. Due to these unknown couplings, one can always add
linear terms in q^2 to the predictions of the form factor f_-(q^2). For the
form factor f_+(q^2), this ambiguity involves even quadratic terms. Making use
of the fact that the pion electromagnetic form factor involves the same q^4
counter term, the q^4-ambiguity can be resolved. Apart from the possibility of
adding an arbitrary linear term in q^2 our calculation shows that chiral
perturbation theory converges very well in this application, as the O(p^6)
corrections are small. Comparing the predictions of chiral perturbation theory
with the recent CPLEAR data, it is seen that the experimental form factor
f_+(q^2) is well described by a linear fit, but that the slope lambda_+ is
smaller by about 2 standard deviations than the O(p^4) prediction. The
unavoidable q^2 counter term of the O(p^6) corrections allows to bring the
predictions of chiral perturbation theory into perfect agreement with
experiment.


title:
Infrared Quasi Fixed Point Structure in Extended Yukawa Sectors and
  Application to R-parity Violation

abstract:
  We investigate one-loop renormalization group evolutions of extended sectors
of Yukawa type couplings. It is shown that Landau Poles which usually provide
necessary low energy upper bounds that saturate quickly with increasing initial
value conditions, lead in some cases to the opposite behaviour: some of the low
energy couplings decrease and become vanishingly small for increasingly large
initial conditions. We write down the general criteria for this to happen in
typical situations, highlighting a concept of {\sl repulsive} quasi-fixed
points, and illustrate the case both within a two-Yukawa toy model as well as
in the minimal supersymmetric standard model with R-parity violation. In the
latter case we consider the theoretical upper bounds on the various couplings,
identifying regimes where $\lambda_{kl3}, \lambda'_{kkk}, \lambda''_{3kl}$ are
dynamically suppressed due to the Landau Pole. We stress the importance of
considering a large number of couplings simultaneously. This leads altogether
to a phenomenologically interesting seesaw effect in the magnitudes of the
various R-parity violating couplings, complementing and in some cases improving
the existing limits.


title: Chiral Lagrangian approach to the J/psi breakup cross section

abstract:
  We summarize the results of the SU(4) chiral meson Lagrangian approach to the
cross section for J/psi breakup by pion and rho meson impact and suggest a new
scheme for the introduction of formfactors for the meson-meson interaction.
This scheme respects the fact that on the quark level of description the
contact and the meson exchange diagrams are constructed by so-called box and
triangle diagrams which contain a different number of vertex functions for the
quark-meson coupling. A model calculation for Gaussian vertex functions is
presented and the relative importance of contact and meson exchange processes
is discussed. We evaluate the dependence of the breakup cross section on the
masses of the final D-meson states which can be used for the study of in-medium
effects on this quantity.


title:
Determination of the axial coupling constant $g_{A}$ in the linear
  representations of chiral symmetry

abstract:
  If a baryon field belongs to a certain linear representation of chiral
symmetry of $SU(2) \otimes SU(2)$, the axial coupling constant $g_{A}$ can be
determined algebraically from the commutation relations derived from the
superconvergence property of pion-nucleon scattering amplitudes. This
establishes an algebraic explanation for the values of $g_{A}$ of such as the
non-relativistic quark model, large-$N_{c}$ limit and the mirror assignment for
two chiral partner nucleons. For the mirror assignment, the axial charges of
the positive and negative parity nucleons have opposite signs. Experiments of
eta and pion productions are proposed in which the sign difference of the axial
charges can be observed.


title:
Damped $\sin(\beta-\alpha)$ of Higgs couplings and the lightest Higgs
  production at $\gamma\gamma$ colliders in MSSM

abstract:
  In the decoupling limit, $M^2_{A^0} \gg M^2_Z$, the heavy CP-even, CP-odd and
charged Higgs boson masses are nearly degenerate, $\sin(\beta-\alpha)$
approaches 1, and the lightest CP-even Higgs boson almost displays the same
properties as the Standard Model Higgs boson. But the stop and sbottom sector
can change this pattern through radiative corrections. We find that there are
parameter regions at small, moderate and large $\tan\beta$ in MSSM under
experimental constraints of $(g-2)_{\mu}$ and $b\to s\gamma$, where
$\sin^2(\beta-\alpha)$ is damped (say below 0.8), which has a significant
effect on Higgs couplings $g_{h^0VV} (V=W^\pm,Z^0)$ and $g_{h^0\gamma\gamma}$.
We discuss its impact on the lightest CP-even Higgs production at
$\gamma\gamma$ colliders.


title: New chiral-symmetry-breaking operators in pseudoscalar QCD sum rules

abstract:
  Nonperturbative Wilson coefficients associated with the leading
chiral-symmetry-breaking operators in the operator product expansion of the
pseudoscalar QCD correlation function are derived. Implementation of the new,
instanton-induced operators enables the corresponding spectral sum rule to
reproduce the small pion mass scale, thereby reconciling it with Goldstone's
theorem. The same operators suppress the contributions of pionic resonances.
Several predictions and structural insights from the new sum rule are
discussed.


title:
A New Renormalization Scheme of Fermion Fields in Electroweak Standard
  Model

abstract: This paper has been withdrawn by the author,due a immature idea.


title:
Lepton Flavor Violating Process in Bi-maximal texture of Neutrino
  Mixings

abstract:
  We investigate the lepton flavor violation in the framework of the MSSM with
right-handed neutrinos taking the large mixing angle MSW solution in the
quasi-degenerate and the inverse-hierarchical neutrino masses. We predict the
branching ratio of $\mu \to e+\gamma$ and $\tau \to \mu+\gamma$ processes
assuming the degenerate right-handed Majorana neutrino masses. We find that the
branching ratio in the quasi-degenerate neutrino mass spectrum is 100 times
smaller than the ones in the inverse-hierarchical and the hierarchical neutrino
spectra. We emphasize that the magnitude of $U_{e3}$ is one of important
ingredients to predict BR($\mu \to e +\gamma $). The effect of the deviation
from the complete-degenerate right-handed Majorana neutrino masses are also
estimated. Furtheremore, we examine the $S_{3\sL}\times S_{3\sR}$ model, which
gives the quasi-degenerate neutrino masses, and the Shafi-Tavartkiladze model,
which gives the inverse-hierarchical neutrino masses. Both predicted branching
ratios of $\mu\to e+\gamma$ are smaller than the experimantal bound.


title:
Standard Model baryogenesis through four-fermion operators in
  braneworlds

abstract:
  We study a new baryogenesis scenario in a class of braneworld models with low
fundamental scale, which typically have difficulty with baryogenesis. The
scenario is characterized by its minimal nature: the field content is that of
the Standard Model and all interactions consistent with the gauge symmetry are
admitted. Baryon number is violated via a dimension-6 proton decay operator,
suppressed today by the mechanism of quark-lepton separation in extra
dimensions; we assume that this operator was unsuppressed in the early Universe
due to a time-dependent quark-lepton separation. The source of CP violation is
the CKM matrix, in combination with the dimension-6 operators. We find that
almost independently of cosmology, sufficient baryogenesis is nearly impossible
in such a scenario if the fundamental scale is above 100 TeV, as required by an
unsuppressed neutron-antineutron oscillation operator. The only exception
producing sufficient baryon asymmetry is a scenario involving
out-of-equilibrium c quarks interacting with equilibrium b quarks.


title: Angular Distribution of Leptons in General ttbar Production and Decay

abstract:
  Angular distribution of the secondary lepton in top-quark production followed
by subsequent semi-leptonic decay is studied assuming general top-quark
couplings. It is shown that the distribution does not depend on any possible
anomalous tbW couplings and is determined only by the standard V-A decay vertex
for any production mechanism if certain well-justified conditions are
satisfied.


title: Heavy flavor kinetics at the hadronization transition

abstract:
  We investigate the in-medium modification of the charmonium breakup processes
due to the Mott effect for light (pi, rho) and open-charm (D, D*)
quark-antiquark bound states at the chiral/deconfinement phase transition. The
Mott effect for the D-mesons effectively reduces the threshold for charmonium
breakup cross sections, which is suggested as an explanation of the anomalous
J/psi suppression phenomenon in the NA50 experiment. Further implications of
finite-temperature mesonic correlations for the hadronization of heavy flavors
in heavy-ion collisions are discussed.


title:
Coherent Coulomb excitation of relativistic nuclei in aligned crystal
  targets

abstract:
  We study coherent Coulomb excitation of ultrarelativistic nuclei passing
through the aligned crystal target. We develop multiple scattering theory
description of this process which consistently incorporates both the specific
resonant properties of particle-crystal interactions and the shadowing effect
typical of the diffractive scattering. We emphasise that the effect of quantum
mechanical diffraction makes the physics of ultrarelativistic nuclear
excitations entirely different from the physics of non-relativistic atomic
excitations experimentally studied so far. It is found that at small transverse
momenta $q_{\perp}$ the shadowing effect drastically changes the dependence of
coherent amplitudes on the crystal thickness $L$, from the widely discussed
growth $\propto L$ typical of the Born approximation to the inverse thickness
attenuation law. At relatively large $q_{\perp}$ no attenuation effect is found
but the coherency condition is shown to put stringent constrain on the growth
of the transition rate with growing $L$.


title: Supersymmetric Dark Matter and Yukawa Unification

abstract:
  An analysis of supersymmetric dark matter under the Yukawa unification
constraint is given. The analysis utilizes the recently discovered region of
the parameter space of models with gaugino mass nonuniversalities where large
negative supersymmetric corrections to the b quark mass appear to allow
$b-\tau$ unification for a positive $\mu$ sign consistent with the $b\to
s+\gamma$ and $g_{\mu}-2$ constraints. In the present analysis we use the
revised theoretical determination of $a_{\mu}^{SM}$ ($a_{\mu}= (g_{\mu}-2)/2$)
in computing the difference $a_{\mu}^{exp}-a_{\mu}^{SM}$ which takes account of
a reevaluation of the light by light contribution which has a positive sign.
The analysis shows that the region of the parameter space with
nonuniversalities of the gaugino masses which allows for unification of Yukawa
couplings also contains regions which allow satisfaction of the relic density
constraint. Specifically we find that the lightest neutralino mass consistent
with the relic density constraint, $b\tau$ unification for SU(5) and $b-t-\tau$
unification for SO(10) in addition to other constraints lies in the region
below 80 GeV. An analysis of the maximum and the minimum neutralino-proton
scalar cross section for the allowed parameter space including the effect of a
new determination of the pion-nucleon sigma term is also given. It is found
that the full parameter space for this class of models can be explored in the
next generation of proposed dark matter detectors.


title: On Teraelectronvolt Majorana Neutrinos

abstract:
  The issue of existence of Majorana neutrinos with masses of the order of TeV
and substantial couplings is addressed. A general neutrino mass matrix
$M_{\nu}$ with both features is constructed, however, the form of $M_{\nu}$ is
constrained very much by severe relations among the elements of $m_D$ and $M_R$
submatrices of $M_{\nu}$. These general relations follow from the perturbative
construction of the light neutrino mass spectrum. To avoid such large
correlations between low mass parameters in $m_D$ and large mass parameters in
$M_R$, the Je\.zabek-Sumino see-saw model of bi-maximal neutrino mixing adopted
to the TeV scale and the issue of possible symmetries of the matrix $M_{\nu}$
are discussed. Results are supported by a few numerical examples which show
directly the complexity of the problem.


title: Effective Chiral Theory for Pseudoscalar and Vector Mesons

abstract:
  We consider the vector meson mixing scheme and mass splitting within the
framework of an extended $U(3)_L\bigotimes U(3)_R$ chiral effective field
theory based on the hidden local symmetry approach where, the pseudoscalar and
vector meson nonets play the role of dynamic variables. Unlike other variants
of this model, we show that the diagonalization of the vector meson mass matrix
and the assumption that its eigenvalues are identical with the physical meson
masses, determines the mixing scheme as well as the model free parameters. We
show that VMD can be derived from our lagrangian and that for electromagnetic
processes at low momenta the VMD model is a good first approximation. The model
reproduces nicely the radii of the charged pions and kaons.


title:
Search for fermion universality of the Dirac component of neutrino mass
  matrix

abstract:
  An effective texture is presented for six Majorana neutrinos, three active
and three (conventional) sterile, based on a 6x6 mass matrix, whose 3x3
active--sterile component (i.e., Dirac component) is conjectured to get a
fermion universal form similar to the constructed previously 3x3 mass matrix
for charged leptons and 3x3 mass matrices for up and down quarks. This is true,
however, when the bimaximal mixing, specific for neutrinos, is transformed out
unitarily from the neutrino mass matrix. The 3x3 active--active component
(i.e., lefthanded component) of neutrino 6x6 mass matrix is diagonal and gets
degenerate entries. It dominates over the whole neutrino mass matrix. In such a
texture, three neutrino masses are nearly degenerate, $ m_1 \simeq m_2 \simeq
m_3 $, but their mass-squared differences appear hierarchical, $\Delta m^2_{21}
\ll \Delta m^2_{32} \simeq \Delta m^2_{31}$, while the remaining three neutrino
masses can be constructed to vanish, $ m_4 = m_5 = m_6 = 0 $, in contrast to
the familiar seesaw mechanism.


title: The Feynman-Schwinger (world-line) representation in perturbative QCD

abstract:
  The proper time path integral representation is derived explicitly for an
arbitrary $n$-point amplitude in QCD. In the standard perturbation theory the
formalism allows to sum up the leading subseries, e.g. yielding
double-logarithm Sudakov asymptotics for form factors. Correspondence with the
standard perturbation theory is established and connection to the
Bern-Kosower-Strassler method is illustrated.


title: Scalar Mesons within a model for all non-exotic mesons

abstract:
  We describe a four-parameter model for non-exotic meson-meson scattering,
which accommodates all non-exotic mesons, hence also the light scalar mesons,
as resonances and bound states characterised by complex singularities of the
scattering amplitude as a function of the total invariant mass. The majority of
the full $S$-matrix mesonic poles stem from an underlying confinement spectrum.
However, the light scalar mesons K0*(830), a0(980), f0(400-1200), and f0(980)
do not, but instead originate in 3P0-barrier semi-bound states.
  In the case of bound states, wave functions can be determined. For ccbar and
bbbar, radiative transitions have been calculated. Here we compare the results
to the data.


title: Fluid Dynamics of Relativistic Quantum Dust

abstract:
  The microscopic transport equations for free fields are solved using the
Schwinger function. Thus, for general initial conditions, the evolution of the
energy-momentum tensor is obtained, incorporating the quantum effects exactly.
The result for relativistic fermions differs from classical hydrodynamics,
which is illustrated for Landau and Bjorken type initial conditions in this
model of exploding primordial matter. Free fermions behave like classical dust
concerning hydrodynamic observables. However, quantum effects which are present
in the initial state are preserved.


title: Zeroes of the Neutrino Mass Matrix

abstract:
  We assume there to be precisely three left-handed neutrino states whose
Majorana masses are generated by an unspecified mechanism. Were CP conserved,
the symmetric neutrino mass matrix M would be real and all six of its distinct
entries could be experimentally determined. But CP is not conserved so that M
is likely to be complex. As a result, not all nine of its
convention-independent real parameters can be determined without an appeal to
theory. Thus we examine the possibility that a restricted class of neutrino
mass matrices may suffice to describe current data, namely those complex
symmetric matrices several of whose entries vanish. We find that there are
seven acceptable textures with two independent zeroes, and we explore their
contrasting phenomenological implications. Textures with more than two
independent zeroes appear to be excluded by experiment.


title:
Should $E_8$ SUSY Yang-Mills be Reconsidered as a Family Unification
  Model?

abstract:
  We review earlier proposals for $E_8$ family unification, and discuss why
recent work of Kovner and Shifman on condensates in supersymmetric Yang-Mills
theories suggests the reconsideration of $E_8$ supersymmetric Yang-Mills as a
family unification theory.


title: Cronin Effect in Hadron Production off Nuclei

abstract:
  Recent data from RHIC for high-$p_T$ hadrons in gold-gold collisions raised
again the long standing problem of quantitatively understanding the Cronin
effect, i.e. nuclear enhancement of high-$p_T$ hadrons due to multiple
interactions in nuclear matter. In nucleus-nucleus collisions this effect has
to be reliably calculated as baseline for a signal of new physics in high-$p_T$
hadron production. The only possibility to test models is to compare with
available data for $pA$ collisions, however, all existing models for the Cronin
effect rely on a fit to the data to be explained. We develop a phenomenological
description based on the light-cone QCD-dipole approach which allows to explain
available data without fitting to them and to provide predictions for $pA$
collisions at RHIC and LHC. We point out that the mechanism causing Cronin
effect drastically changes between the energies of fixed target experiments and
RHIC-LHC. High-$p_T$ hadrons are produced incoherently on different nucleons at
low energies, whereas the production amplitudes interfere if the energy is
sufficiently high.


title: Photon Production in Heavy Ion Collisions

abstract: The production of photons in heavy ion collisions is dicussed.


title:
Matter Effects of Thin Layers: Detecting Oil by Oscillations of Solar
  Neutrinos

abstract:
  We consider a possibility to use the solar neutrinos for studies of small
scale structures of the Earth and for geological research. Effects of thin
layers of matter with density contrast on oscillations of Beryllium neutrinos
inside the Earth are studied. We find that change of the $^7Be$ neutrino flux
can reach 0.1 % for layers with density of oil and size 20 km. Problems of
detection are discussed. Hypothetical method would consist of measuring the
$^7Be -$ flux by, {\it e.g.}, large deep underwater detector$-$submarine which
could change its location.


title: Extended Quark Potential Model from Random Phase Approximation

abstract:
  The quark potential model is extended to include the sea quark excitation
using the random phase approximation (RPA). The effective quark interaction
preserves the important Quantum Chromodynamics (QCD) properties -- chiral
symmetry and confinement simultaneously. A primary qualitive analysis shows
that the $\pi$ meson as a well-known typical Goldstone boson and the other
mesons made up of valence $q\bar{q}$ quark pair such as the $\rho$ meson can
also be described in this extended quark potential model.


title: SUSY Dark Matter in the Universe- Theoretical Direct Detection Rates

abstract:
  Exotic dark matter together with the vacuum energy or cosmological constant
seem to dominate in the Universe. An even higher density of such matter seems
to be gravitationally trapped in the Galaxy. Thus its direct detection is
central to particle physics and cosmology. Current supersymmetric models
provide a natural dark matter candidate which is the lightest supersymmetric
particle (LSP). Such models combined with fairly well understood physics like
the quark substructure of the nucleon and the nuclear structure (form factor
and/or spin response function), permit the evaluation of the event rate for
LSP-nucleus elastic scattering. The thus obtained event rates are, however,
very low or even undetectable. So it is imperative to exploit the modulation
effect, i.e. the dependence of the event rate on the earth's annual motion.
Also it is useful to consider the directional rate, i.e its dependence on the
direction of the recoiling nucleus. In this paper we study such a modulation
effect both in non directional and directional experiments. We calculate both
the differential and the total rates using both isothermal, symmetric as well
as only axially asymmetric, and non isothermal, due to caustic rings, velocity
distributions. We find that in the symmetric case the modulation amplitude is
small. The same is true for the case of caustic rings. The inclusion of
asymmetry, with a realistic enhanced velocity dispersion in the galactocentric
direction, yields an enhanced modulation effect, especially in directional
experiments.


title: Penguin-Induced Radiative Baryonic B Decays

abstract:
  Weak radiative baryonic B decays $B\to\B_1\ov \B_2\gamma$ mediated by the
electromagnetic penguin process $b\to s\gamma$ have appreciable rates larger
than their two-body counterparts $B\to\B_1\ov \B_2$. The branching ratios for
$B^-\to\Lambda\bar p\gamma$ and $B^-\to\Xi^0\bar\Sigma^-\gamma$ are sizable,
falling into the range of $(1\sim 6)\times 10^{-6}$ with the value preferred to
be on the large side, and not far from the bottom baryon radiative decays
$\Lambda_b\to\Lambda\gamma$ and $\Xi_b\to\Xi\gamma$ due to the large
short-distance enhancement for $b\to s\gamma$ penguin transition and the large
strong coupling of the anti-triplet bottom baryons with the B meson and the
light baryon. These penguin-induced radiative baryonic B decay modes should be
accessible by B factories.


title: F-Term Hybrid Inflation, the \eta-problem and Extra Dimensions

abstract:
  F-term hybrid inflation models in the context of supergravity generically
have corrections to the inflaton mass squared of the order of H^{2} (the
\eta-problem). In addition they have a problem with large deviations of the
spectrum of density perturbations from scale-invariance due to
non-renormalizable corrections to the superpotential. Here we show that an
increase of the expansion rate at large energy densities relative to that in
conventional d=4 cosmology, as suggested by the single brane Randall-Sundrum
scenario with an uncompactified extra dimension, can naturally solve the \eta
problem. This requires that the d=5 Planck mass satisfies M_{5} < 10^{16} GeV.
In addition, the scale-invariance of the density perturbation spectrum can be
generally protected from Planck-suppressed superpotential corrections if M_{5}
< 10^{10} \GeV


title:
Spin force dependence of the parton distributions: the ratio
  $F_2^n(x,Q^2)/F_2^p(x,Q^2)$

abstract:
  Light-front Hamiltonian dynamics is used to relate low-energy constituent
quark models to deep inelastic unpolarized structure functions of the nucleon.
The approach incorporates the correct Pauli principle prescription consistently
and it allows a transparent investigation of the effects due to the
spin-dependent SU(6)-breaking terms in the quark model Hamiltonian. Both
Goldstone-boson-exchange interaction and hyperfine-potential models are
discussed in a unified scheme and a detailed comparison, between the
two(apparently) different potential prescriptions, is presented.


title: Deconstruction, G_2 Holonomy, and Doublet-Triplet Splitting

abstract:
  We describe a mechanism for using discrete symmetries to solve the
doublet-triplet splitting problem of four-dimensional supersymmetric GUT's. We
present two versions of the mechanism, one via ``deconstruction,'' and one in
terms of M-theory compactification to four dimensions on a manifold of G_2
holonomy.


title: The thrust and heavy-jet mass distributions in the two-jet region

abstract:
  Dressed Gluon Exponentiation (DGE) is used to calculate the thrust and the
heavy-jet mass distributions in e+e- annihilation in the two-jet region. We
perform a detailed analysis of power corrections, taking care of the effect of
hadron masses on the measured observables. In DGE the Sudakov exponent is
calculated in a renormalization-scale invariant way using renormalon
resummation. Neglecting the correlation between the hemispheres in the two-jet
region, we express the thrust and the heavy-jet mass distributions in terms of
the single-jet mass distribution. This leads to a simple description of the
hadronization corrections to both distributions in terms of a single shape
function, whose general properties are deduced from renormalon ambiguities.
Matching the resummed result with the available next-to-leading order
calculation, we get a good description of the thrust distribution in a wide
range, whereas the description of the heavy-jet mass distribution, which is
more sensitive to the approximation of the phase space, is restricted to the
range rho_H<1/6. This significantly limits the possibility to determine alpha_s
from this observable. However, fixing alpha_s by the thrust analysis, we show
that the power corrections for the two observables are in good agreement.


title: Roper Electroproduction Amplitudes in a Chiral Confinement Model

abstract:
  A description of the Roper using the chiral chromodielectric model is
presented and the transverse $A_{1/2}$ and the scalar $S_{1/2}$ helicity
amplitudes for the electromagnetic Nucleon--Roper transition are obtained for
small and moderate $Q^2$. The sign of the amplitudes is correct but the model
predictions underestimate the data at the photon point. Our results do not
indicate a change of sign in any amplitudes up to $Q^2\sim1$ GeV$^2$. The
contribution of the scalar meson excitations to the Roper electroproduction is
taken into account but it turns out to be small in comparison with the quark
contribution. However, it is argued that mesonic excitations may play a more
prominent role in higher excited states.


title: Scattering Cross Sections and Lorentz Violation

abstract:
  To date, a significant effort has been made to adddress the Lorentz violating
standard model in low-energy systems, but little is known about the
ramifications for high-energy cross sections. In this talk, I discuss the
modified Feynman rules that result when Lorentz violation is present and give
the results of an explicit calculation for electron-positron annihilation into
two photons.


title: Theory of Neutrino Masses and Mixings

abstract:
  Neutrino physics is going through a revolutionary progress. In this talk I
review what we have learned and why neutrino mass is so important. Neutrino
masses and mixings are already shedding new insight into the origin of flavor.
Given the evidences for neutrino mass, leptogenesis is gaining momentum as the
origin of cosmic baryon asymmetry. Best of all, we will learn a lot more in the
coming years.


title: $h \to \mu^+\mu^-$ via gluon fusion at the LHC

abstract:
  We study the observability of the $h\to \mu^+\mu^-$ decay in the Standard
Model and the MSSM at the LHC. The observation of the $h\mu\mu$ coupling is
important to determine whether the Higgs particle that generates mass for the
weak bosons is also responsible for mass generation of the second generation of
fermions. We find that the signal via the gluon fusion channel is comparable to
that from the weak-boson fusion. By combining these two channels, observing
$h\to \mu^+\mu^-$ is feasible at the LHC with a delivered luminosity of $300
fb^{-1}$ at $3\sigma$ statistical significance for 110 GeV $<m_h<140$ GeV in
the Standard Model. This corresponds to a $h\mu\mu$ coupling determination at
about 15% accuracy assuming $ht\bar t, hb\bar b$ couplings SM-like. The
observation becomes more promising in the MSSM for $\tan\beta>8$ and $M_A<130$.


title: Constraints on neutrino-photon interactions from rare Z decays

abstract:
  It is shown that the rare decays $Z \to \nu \bar{nu} \gamma$ and $Z \to \nu
\bar{\nu} \gamma \gamma$ are useful to put model-independent bounds on
neutrino-one-photon and neutrino-two-photon interactions. The results are then
used to constrain the $\tau$ neutrino magnetic moment and the double radiative
decay $\nu_j \to \nu_i \gamma \gamma$. It is found that the decay $Z \to \nu
\bar{nu} \gamma$ gives a more stringent bound on the $\tau$ neutrino magnetic
moment than that obtained from $Z \to \nu \bar{\nu} \gamma \gamma$; the latter
decay in turn gives limits on the neutrino-two-photon interaction that are less
stringent than those obtained for a sterile neutrino $\nu_s$ from the analysis
of $\nu_\mu N \to \nu_s N$ conversion.