title: Radiative pion capture by a nucleon

abstract:
  The differential cross sections for $\pi^- p \to \gamma n$ and $\pi^+ n \to
\gamma p$ are computed up to $O(p^3)$ in heavy baryon chiral perturbation
theory (HBChPT). The expressions at $O(p)$ and $O(p^2)$ have no free
parameters. There are three unknown parameters at $O(p^3)$, low energy
constants of the HBChPT Lagrangian, which are determined by fitting to
experimental data. Two acceptable fits are obtained, which can be separated by
comparing with earlier dispersion relation calculations of the inverse process.
Expressions for the multipoles, with emphasis on the p-wave multipoles, are
obtained and evaluated at threshold. Generally the results obtained from the
best of the two fits are in good agreement with the dispersion relation
predictions.


title: Gravitino Dark Matter without R-parity

abstract:
  Cosmological issues are examined when gravitino is the lightest superparticle
(LSP) and R-parity is broken. Decays of the next lightest superparticles occur
rapidly via R-parity violating interaction, and thus they do not upset the
big-bang nucleosynthesis, unlike the R-parity conserving case. The gravitino
LSP becomes unstable, but its lifetime is typically much longer than the age of
the Universe. It turns out that observations of diffuse photon background
coming from radiative decays of the gravitino do not severely constrain the
gravitino abundance, and thus the gravitino weighing less than around 1 GeV can
be dark matter of the Universe when bilinear R-parity violation generates a
neutrino mass which accounts for the atmospheric neutrino anomaly.


title: Coherent scattering of high-energy photon in a medium

abstract:
  The coherent scattering of photon in the Coulomb field (the Delbr\"uck
scattering) is considered for the momentum transfer $\Delta \ll m$ in the frame
of the quasiclassical operator method. In high-energy region this process
occurs over rather long distance. The process amplitude is calculated taking
into account the multiple scattering of particles of the intermediate
electron-positron pair in a medium. The result is the suppression of the
process. Limiting cases of weak and strong effects of the multiple scattering
are analyzed. The approach used is the generalization of the method developed
by authors for consideration of the Landau-Pomeranchuk-Migdal effect.


title: Self-organized criticality in atmospheric cascades

abstract:
  We argue that atmospheric cascades can be regarded as example of the
self-organized criticality and studied by using Levy flights and nonextensive
approach. It allows us to understand the scale-invariant energy fluctuations
inside cascades in a natural way.


title: Muons from strangelets

abstract:
  The hypothesis is discussed that muon bundles of extremaly high multiplicity
observed recently by ALEPH detector (in the dedicated cosmic-ray run) can
originate from the strangelets colliding with the atmosphere.


title:
Analytic coupling and Sudakov effects in exclusive processes: pion and
  $\gamma^{*}\gamma\to\pi^{0}$ form factors

abstract:
  We develop and discuss in technical detail an infrared-finite factorization
and optimized renormalization scheme for calculating exclusive processes, which
enables the inclusion of transverse degrees of freedom without entailing
suppression of calculated observables, like form factors. This is achieved by
employing an analytic, i.e., infrared stable, running strong coupling $\alpha
_{\rm s}(Q^{2})$ which removes the Landau singularity at $Q^{2}=\Lambda_{\rm
QCD}^{2}$ by a minimum power-behaved correction. The ensuing contributions to
the cusp anomalous dimension - related to the Sudakov form factor - and to the
quark anomalous dimension - which controls evolution - lead to an enhancement
at high $Q^{2}$ of the hard part of exclusive amplitudes, calculated in
perturbative QCD, while simultaneously improving its scaling behavior. The
phenomenological implications of this framework are analyzed by applying it to
the pion's electromagnetic form factor, including the NLO contribution to the
hard-scattering amplitude, and also to the pion-photon transition at LO. For
the pion wave function, an improved ansatz of the Brodsky-Huang-Lepage type is
employed, which includes an effective (constituent-like) quark mass, $m_{\rm
q}=0.33$ GeV. Predictions for both form factors are presented and compared to
the experimental data, applying Brodsky-Lepage-Mackenzie commensurate scale
setting. We find that the perturbative hart part prevails at momentum transfers
above about 20 GeV ${}^{2}$, while at lower $Q^{2}$-values the pion form factor
is dominated by Feynman-type contributions. The theoretical prediction for the
$\gamma ^{*}\gamma \to \pi ^{0}$ form factor indicates that the true pion
distribution amplitude may be somewhat broader than the asymptotic one.


title:
Dynamical growth of the hadron bubbles during the quark-hadron phase
  transition

abstract:
  The rate of dynamical growth of the hadron bubbles in a supercooled baryon
free quark-gluon plasma, is evaluated by solving the equations of relativistic
fluid dynamics in all regions. For a non-viscous plasma, this dynamical growth
rate is found to depend only on the range of correlation $\xi$ of order
parameter fluctuation, and the radius $R$ of the critical hadron bubble, the
two length scales relevant for the description of the critical phenomena.
Further, it is shown that the dynamical prefactor acquires an additive
component when the medium becomes viscous. Interestingly, under certain
reasonable assumption for the velocity of the sound in the medium around the
saddle configuration, the viscous and the non-viscous parts of the prefactor
are found to be similar to the results obtained by Csernai-Kapusta and
Ruggeri-Friedman (for the case of zero viscosity) respectively.


title:
Remarks on a Proposed Super-Kamiokande Test for Quantum Gravity Induced
  Decoherence Effects

abstract:
  Lisi, Marrone, and Montanino have recently proposed a test for quantum
gravity induced decoherence effects in neutrino oscillations observed at
Super-Kamiokande. We comment here that their equations have the same
qualitative form as the energy conserving objective state vector reduction
equations discussed by a number of authors. However, using the Planckian
parameter value proposed to explain state vector reduction leads to a neutrino
oscillation effect many orders of magnitude smaller than would be detectable at
Super-Kamiokande. Similar estimates hold for the Ghirardi, Rimini, and Weber
spontaneous localization approach to state vector reduction, and our remarks
are relevant as well to proposed $K$ meson and $B$ meson tests of gravity
induced decoherence.


title:
Charm Production in Deep Inelastic Scattering from Threshold to High
  $Q^{2}

abstract:
  Charm final states in deep inelastic scattering constitute $\sim 25%$ of the
inclusive cross-section at small $x$ as measured at HERA. These data can reveal
important information on the charm and gluon structure of the nucleon if they
are interpreted in a consistent perturbative QCD framework which is valid over
the entire energy range from threshold to the high energy limit. We describe in
detail how this can be carried out order-by-order in PQCD in the generalized
\msbar formalism of Collins (generally known as the ACOT approach), and
demonstrate the inherent smooth transition from the 3-flavor to the 4-flavor
scheme in a complete order $\alpha_s$ calculation, using a Monte Carlo
implementation of this formalism. This calculation is accurate to the same
order as the conventional NLO $F_2$ calculation in the limit $\frac{Q}{m_c} >>
1$. It includes the resummed large logarithm contributions of the 3-flavor
scheme (generally known in this context as the fixed-flavor-number or FFN
scheme) to all orders of $\alpha_s\ln(m_c^2/Q^2)$. For the inclusive structure
function, comparison with recent HERA data and the existing FFN calculation
reveals that the relatively simple order-$\alpha_s$ (NLO) 4-flavor ($m_c \neq
0$) calculation can, in practice, be extended to rather low energy scales,
yielding good agreement with data over the full measured $Q^2$ range. The Monte
Carlo implementation also allows the calculation of differential distributions
with relevant kinematic cuts. Comparisons with available HERA data show
qualitative agreement; however, they also indicate the need to extend the
calculation to the next order to obtain better description of the differential
distributions.


title: Quintessence models in Supergravity

abstract:
  Scalar field models of quintessence typically require that the expectation
value of the field today is of order the Planck mass, if we want them to
explain the observed acceleration of the Universe. This suggests that we should
be considering models in the context of supergravity. We discuss a particular
class of supergravity models and analyze their behavior under different choices
of the Kahler metric.


title:
Real-time nonequilibrium dynamics in hot QED plasmas: dynamical
  renormalization group approach

abstract:
  We study the real-time nonequilibrium dynamics in hot QED plasmas
implementing a dynamical renormalization group and using the hard thermal loop
(HTL) approximation. The focus is on the study of the relaxation of gauge and
fermionic mean fields and on the quantum kinetics of the photon and fermion
distribution functions. For semihard photons of momentum eT << k << T we find
to leading order in the HTL that the gauge mean field relaxes in time with a
power law as a result of infrared enhancement of the spectral density near the
Landau damping threshold. The dynamical renormalization group reveals the
emergence of detailed balance for microscopic time scales larger than 1/k while
the rates are still varying with time. The quantum kinetic equation for the
photon distribution function allows us to study photon production from a
thermalized quark-gluon plasma (QGP) by off-shell effects. We find that for a
QGP at temperature T ~ 200 MeV and of lifetime 10 < t < 50 fm/c the hard (k ~
T) photon production from off-shell bremsstrahlung (q -> q \gamma and \bar{q}
-> \bar{q}\gamma) at O(\alpha) grows logarithmically in time and is comparable
to that produced from on-shell Compton scattering and pair annihilation at
O(\alpha \alpha_s). Fermion mean fields relax as e^{-\alpha T t ln(\omega_P t)}
with \omega_P=eT/3 the plasma frequency, as a consequence of the emission and
absorption of soft magnetic photons. A quantum kinetic equation for hard
fermions is obtained directly in real time from a field theoretical approach
improved by the dynamical renormalization group. The collision kernel is
time-dependent and infrared finite.


title: Nonequilibrium Quantum Dynamics of Second Order Phase Transitions

abstract:
  We use the so-called Liouville-von Neumann (LvN) approach to study the
nonequilibrium quantum dynamics of time-dependent second order phase
transitions. The LvN approach is a canonical method that unifies the functional
Schr\"{o}dinger equation for the quantum evolution of pure states and the LvN
equation for the quantum description of mixed states of either equilibrium or
nonequilibrium. As nonequilibrium quantum mechanical systems we study a
time-dependent harmonic and an anharmonic oscillator and find the exact Fock
space and density operator for the harmonic oscillator and the nonperturbative
Gaussian Fock space and density operator for the anharmonic oscillator. The
density matrix and the coherent, thermal and coherent-thermal states are found
in terms of their classical solutions, for which the effective Hamiltonians and
equations of motion are derived. The LvN approach is further extended to
quantum fields undergoing time-dependent second order phase transitions. We
study an exactly solvable model with a finite smooth quench and find the
two-point correlation functions. Due to the spinodal instability of long
wavelength modes the two-point correlation functions lead to the
$t^{1/4}$-scaling relation during the quench and the Cahn-Allen scaling
relation $t^{1/2}$ after the completion of quench. Further, after the finite
quench the domain formation shows a time-lag behavior at the cubic power of
quench period. Finally we study the time-dependent phase transition of a
self-interacting scalar field.


title: QCD at finite isospin density

abstract:
  QCD at finite isospin chemical potential mu_I has no fermion sign problem and
can be studied on the lattice. We solve this theory analytically in two limits:
at low mu_I where chiral perturbation theory is applicable, and at
asymptotically high mu_I where perturbative QCD works. At low isospin density
the ground state is a pion condensate, whereas at high density it is a Fermi
liquid with Cooper pairing. The pairs carry the same quantum numbers as the
pion. This leads us to a conjecture that the transition from hadron to quark
matter is smooth, which passes several tests. Our results imply a nontrivial
phase diagram in the space of temperature and chemical potentials of isospin
and baryon number.


title: Report of the Working Group on Photon and Weak Boson Production

abstract:
  This report discusses physics issues which can be addressed in photon and
weak boson production in Run II at the Tevatron. The current understanding and
the potential of Run II to expand our knowledge of direct photon production in
hadronic collisions is discussed. We explore the prospects for using the
W-boson cross section to measure the integrated luminosity, improving the
measurement of the W and Z boson transverse momentum distributions, the Z ->
b\bar b signal, and the lepton angular distribution in W decays. Finally, we
consider the prospects for measuring the trilinear gauge boson couplings in Run
II.


title:
Constraints on the Mass and Mixing of the 4th Generation Quark From
  Direct CP Violation$\epsilon^{\prime}/\epsilon$ and Rare K Decays

abstract:
  We investigate the $\epsilon^{\prime} /\epsilon$ for $K\to \pi\pi$ in a
sequential fourth generation model. By giving the basic formulae for
$\epsilon^{\prime}/\epsilon$ in this model, we analyze the numerical results
which are dependent of $m_{t^{\prime}}$ and imaginary part of the fourth CKM
factor, ${Im}V^{*}_{t^{'}s}V_{t^{'}d}$ (or $V^{*}_{t^{'}s}V_{t^{'}d}$ and the
fourth generation CKM matrix phase $\theta$). We find that, unlike the SM, when
taking the central values of all parameters for $\epsilon^{\prime}/\epsilon$,
the values of $\epsilon^{\prime}/ \epsilon$ can easily fit to the current
experimental data for all values of hadronic matrix elements estimated from
various approaches. Also, we show that the experimental values of
$\epsilon^{\prime}/\epsilon$ and rare K decays can provide a strong constraint
on both mass and mixing of the fourth generation quark. When taking the values
of hadronic matrix elements from the lattice or 1/N expansion calculations, a
large region of the up-type quark mass $m_{t^{\prime}}$ is excluded.


title: Neutrino Propagation In Color Superconducting Quark Matter

abstract:
  We calculate the neutrino mean free path in color superconducting quark
matter, and employ it to study the cooling of matter via neutrino diffusion in
the superconducting phase as compared to a free quark phase. The cooling
process slows when quark matter undergoes a second order phase transition to a
superconducting phase at the critical temperature $T_c$. Cooling subsequently
accelerates as the temperature decreases below $T_c$. This will directly impact
the early evolution of a newly born neutron star should its core contain quark
matter. Consequently, there may be observable changes in the early neutrino
emission which would provide evidence for superconductivity in hot and dense
matter.


title: Twisted Family Structure and Neutrino Large Mixing

abstract:
  I demonstrate that neutrino large mixing between $\nu_\mu$ and $\nu_\tau$ are
naturally reproduced using a novel mechanism called `E-twisting'in a
supersymmetric $E_6$ grand unification model. This model explains all the
characteristic features of the quark/lepton Dirac masses as well as the
neutrino's Majorana masses despite the fact that all the members in {\bf27} of
each generation are assigned a common family charge. Most remarkably, this
model yields a novel relation which gives the 2-3 lepton mixing angle
$\theta_{\mu\tau}$ in terms of quark masses and CKM mixing:
$\tan\theta_{\mu\tau}=(m_b/m_s)V_{cb}$, which is a kind of SO(10) GUT relation
similar to the celebrated SU(5) bottom-tau mass ratio. This relation is a
result of a common `twisted SO(10)' structure.+


title: Energy loss and $x_2$ scaling breakdown in $J/\psi$ nuclear production

abstract:
  In addition to the final-state interactions, $J/\psi$ nuclear production
might also be affected by parton energy loss. Using the upper limits from
Drell-Yan data at SPS and Fermilab energies, we estimated energy loss
contribution to $J/\psi$ production in p-A collisions. The results indicated
that the effects might be sizeable at 200 GeV while remaining small at higher
energies.


title:
Natural Mass Hierarchy of Z Boson and Scalar Top in No-Scale
  Supergravity

abstract:
  It is studied that `no-scale' model makes hierarchy between scalar top mass
and Z boson mass naturally. The supersymmetry breaking parameters are
constrained by flavor changing neutral currents in minimal supersymmetric
standard model. One of the solution of the problem is that gaugino mass is the
only source of the supersymmetry breaking parameters at Planck scale. However,
in such scenario, we need a cancellation between Higgs mass parameters in
minimization condition of the Higgs potential. We insist that there is no such
cancellation in no-scale model, and that the no-scale model gives us the
prediction of scalar top mass and lightest Higgs mass. The lightest Higgs mass
is predicted as $m_H = 110 \pm 5 $ GeV.


title: Using differential equations to compute two-loop box integrals

abstract:
  The calculation of exclusive observables beyond the one-loop level requires
elaborate techniques for the computation of multi-leg two-loop integrals. We
discuss how the large number of different integrals appearing in actual
two-loop calculations can be reduced to a small number of master integrals. An
efficient method to compute these master integrals is to derive and solve
differential equations in the external invariants for them. As an application
of the differential equation method, we compute the ${\cal O}(\epsilon)$-term
of a particular combination of on-shell massless planar double box integrals,
which appears in the tensor reduction of $2 \to 2$ scattering amplitudes at two
loops.


title: Aspects of QCD, from the Tevatron to the LHC

abstract:
  This contribution presents a selection of the topics (parton densities,
fixed-order calculations, parton showers, soft-gluon resummation) discussed in
my introductory lectures at the Workshop and includes a pedagogical overview of
the corresponding theoretical tools.


title: SUSY Dark Matter

abstract:
  Several new effects have been investigated in recent analyses of
supersymmetric dark matter. These include the effects of the uncertainties of
wimp velocity distributions, of the uncertainties of quark densities, of large
CP violating phases, of nonuniversalities of the soft SUSY breaking parameters
at the unification scale and of coannihilation on supersymmetric dark matter.
We review here some of these with emphasis on the effects of nonuniversalities
of the gaugino masses at the unification scale on the neutralino-proton
cross-section from scalar interactions. The review encompasses several models
where gaugino mass nonuniversalities occur including SUGRA models and D brane
models. One finds that gaugino mass nonuniversalities can increase the scalar
cross-sections by as much as a factor of 10 and also significantly extend the
allowed range of the neutralino mass consistent with constraints up to about
500 GeV. These results have important implications for the search for
supersymmetric dark matter.


title: Brane-World Cosmology of Modulus Stabilization with a Bulk Scalar Field

abstract:
  We point out that the potential of Goldberger and Wise for stabilizing the
distance between two 3-branes, separated from each other along an extra
dimension with a warp factor, has a metastable minimum when the branes are
infinitely separated. The classical evolution of the radion (brane separation)
will place it in this false minimum for generic initial conditions. In
particular, inflation could do this if the expansion rate is sufficiently
large. We present a simplified version of the Goldberger-Wise mechanism in
which the radion potential can be computed exactly, and we calculate the rate
of thermal transitions to the true minimum, showing that model parameters can
be chosen to ensure that the universe reaches the desired final state.
Finiteness of bulk scalar field brane potentials can have an important impact
on the nucleation rate, and it can also significantly increase the predicted
mass of the radion.


title: Universal Torsion-Induced Interaction from Large Extra Dimensions

abstract:
  We consider the Kaluza-Klein (KK) scenario in which only gravity exists in
the bulk. Without the assumption of symmetric connection, the presence of brane
fermions induces torsion. The result is a universal axial contact interaction
that dominates those induced by KK gravitons. This enhancement arises from a
large spin density on the brane. Using a global fit to Z-pole observables, we
find the 3 sigma bound on the scale of quantum gravity to be 28 TeV for n=2. If
Dirac or light sterile neutrinos are present, the data from SN1987A increase
the bound to \sqrt{n}M_S >= 210 TeV.


title: Is There a Third Companion of Lambda and Sigma0?

abstract:
  The comparison of magnetic moments of neutron and proton reveals three
possible states of a nucleon each composed of quark plus diquark. In this
scheme for the quark content uds there should be three baryons with a different
structure: ud+s, us+d, ds+u. So one can expect the existence of a third
companion to the known baryons Lambda and Sigma0.


title:
Discovering mirror particles at the Large Hadron Collider and the
  implied cold universe

abstract:
  The Mirror Matter or Exact Parity Model sees every standard particle,
including the physical neutral Higgs boson, paired with a parity partner. The
unbroken parity symmetry forces the mass eigenstate Higgs bosons to be maximal
mixtures of the ordinary and mirror Higgs bosons. Each of these mass
eigenstates will therefore decay 50% of the time into invisible mirror
particles, providing a clear and interesting signature for the Large Hadron
Collider (LHC) which could thus establish the existence of the mirror world.
However, for this effect to be observable the mass difference between the two
eigenstates must be sufficiently large. In this paper, we study cosmological
constraints from Big Bang Nucleosynthesis on the mass difference parameter. We
find that the temperature of the radiation dominated (RD) phase of the universe
should never have exceeded a few 10's of GeV if the mass difference is to be
observable at the LHC. Chaotic inflation with very inefficient reheating
provides an example of how such a cosmology could arise. We conclude that the
LHC could thus discover the mirror world and simultaneously establish an upper
bound on the temperature of the RD phase of the universe.


title:
A See-Saw Mechanism for Large Neutrino Mixing from Small Quark and
  Lepton Mixings

abstract:
  I introduce and sketch the main features of those see-saw models where a
large atmospheric mixing can be achieved starting from nearly diagonal matrices
for charged leptons, Dirac neutrinos and Majorana right-handed neutrinos. It
turns out that these models can be realized in Grand Unified Theories and they
are well compatible with the related phenomenology of fermion masses and
mixings.


title:
Effects of R-parity violation on CP asymmetries in $\Lambda_b \to p \pi$
  decay

abstract:
  We have studied new CP violating effects in $\Lambda_b \to p \pi$ decay mode,
that can arise in Minimal Supersymmetric Standard Model with R-parity
violation. We have estimated how much R-parity violation modifies the Standard
Model predictions for CP asymmetries within the present bounds. We found that
in the R-parity violating model, the rate asymmetry ($a_{cp}$) is suppressed
(about 10 times) and the asymmetry parameter $A(\alpha)$ is enhanced
(approximately $10^2$ times) with respect to the SM predictions.


title:
Nonperturbative infrared dynamics of three-dimensional QED with a
  four-fermion interaction

abstract:
  A non-linear Schwinger-Dyson (SD) equation for the gauge boson propagator of
massless QED in one time and two spatial dimensions is studied. It is shown
that the nonperturbative solution leads to a nontrivial renormalization-group
infrared fixed point quantitatively close to the one found in the leading order
of the 1/N expansion, with N the number of fermion flavors. In the gauged
Nambu-Jona-Lasinio (GNJL) model an equation for the Yukawa vertex is solved in
an approximation given by the one-photon exchange and an analytic expression is
derived for the propagator of the scalar fermion-antifermion composites.
Subsequently, the mass and width of the scalar composites near the phase
transition line are calculated as functions of the four-fermion coupling g and
flavor number N. The possible relevance of these results for describing
particle-hole excitations, in particular antiferromagnetic correlations,
observed in the underdoped cuprates, is briefly discussed.

categories: hep-ph cond-mat.str-el cond-mat.supr-con hep-th


title: Current Issues in Heavy Quark Production

abstract: We discuss heavy quark production in deep inelastic scattering (DIS)


title: Two loop matching conditions on $\bar{\rm MS}$ parton densities

abstract:
  We discuss how the operator product expansion (OPE) can be used to derive
asymptotic expressions for certain integrals. This yields operator matrix
elements (OME's) which determine the matching conditions for $\bar{\rm MS}$
parton densities across heavy flavour thresholds. Then we construct four and
five-flavour densities from a three-flavour set via the AP equation using LO
and NLO splitting functions.


title:
MSW Solutions to the Solar Neutrino Problem in Presence of Noisy Matter
  Density Fluctuations

abstract:
  We study the effect of random matter density fluctuations in the sun on
resonant neutrino conversion in matter by solving numerically the evolution
equation for the neutrino system including the full effect of the random matter
density fluctuations of given amplitude and correlation length. In order to
establish the possible effect on the MSW solutions to the solar neutrino
problem we perform a global analysis of all the existing observables including
the measured total rates as well as the Super-Kamiokande measurement on the
time dependence of the event rates during the day and night and the recoil
electron energy spectrum. We find the effects of random noise to be larger for
small mixing angles and they are mostly important for correlation lengths in
the range few 100 km $\lesssim L_0\lesssim$ few 1000 km. They can be understood
as due to a parametric resonance occuring when the phase acquired by the
oscillating neutrino state on one fluctuation length L_0 is a multiple of
2$\pi$. We find that this resonant parametric condition is mainly achieved for
low energy neutrinos such as the pp-neutrinos and therefore its effect is
mostly seen on the total event rates while the other Super-Kamiokande
observables are very marginally sensitive to the presence of noise due to the
higher energy threshold.


title: Flavour Stability of the Chiral Vacuum and Scalar Meson Dynamics

abstract:
  Previous work relating the flavour variation of the chiral order parameters
$F_\pi$, $<\bar u u>$ and S-wave scattering data, based on chiral sum rules and
chiral perturbation theory at order $p^4$, is extended to include $O(p^6)$
corrections. The finding of a significant decrease of these order parameters,
particularly $<\bar u u>$, with the number of flavours increasing from $N_F=2$
to $N_F=3$ is confirmed, modulo an assumption on the convergence of the chiral
expansion. The connection between scalar resonance physics and the phase
structure of the chiral vacuum is also illustrated on the basis of the linear
sigma-model. We allow for a very general symmetry breaking sector compatible
with softness. The result depends strongly on the input scalar meson masses, in
particular, on the presence, or not, of a light sigma.}


title:
The Reach of LHC (CMS) for Models with Effective Supersymmetry and
  Nonuniversal Gaugino Masses

abstract:
  We investigate squark and gluino pair production at LHC (CMS) with subsequent
decays into quarks, leptons and LSP in models with effective supersymmetry
where third generation of squarks is relatively light while the first two
generations of squarks are heavy. We consider the general case of nonuniversal
gaugino masses. Visibility of signal by an excess over SM background in $(n
\geq 2)jets + (m \geq 0)leptons + E^{miss}_T$ events depends rather strongly on
the relation between LSP, second neutralino, gluino and squark masses and it
decreases with the increase of LSP mass.


title:
The Effective Potential And Additional Large Radius Compactified
  Space-Time Dimensions

abstract:
  The consequences of large radius extra space-time compactified dimensions on
the four dimensional one loop effective potential are investigated for a model
which includes scalar self interactions and Yukawa coupling to fermions. The
Kaluza-Klein tower of states associated with the extra compact dimensions
shifts the location of the effective potential minimum and modifies its
curvature. The dependence of these effects on the radius of the extra dimension
is illustrated for various choices of coupling constants and masses. For large
radii, the consequence of twisting the fermion boundary condition on the
compactified dimensions is numerically found to produce but a negligible effect
on the effective potential.


title: Extracting Weak Phase Information from B -> V_1 V_2 Decays

abstract:
  We describe a new method for extracting weak, CP-violating phase information,
with no hadronic uncertainties, from an angular analysis of B -> V_1 V_2
decays, where V_1 and V_2 are vector mesons. The quantity $\sin^2 (2\beta +
\gamma)$ can be cleanly obtained from the study of decays such as B_d^0(t) ->
D^{*\pm} \rho^\mp, D^{*\pm} a_1^{\mp}, D^{*0} K^{*0}, etc. Similarly, one can
use B_s^0(t) -> D_s^{*\pm} K^{*\mp} to extract $\sin^2 \gamma$. There are no
penguin contributions to these decays. It is possible that $\sin^2 (2\beta +
\gamma)$ will be the second function of CP phases, after $\sin 2\beta$, to be
measured at B-factories.


title: Discrete Flavor Symmetries and Mass Matrix Textures

abstract:
  We show how introducing discrete Abelian flavor symmetries can produce
texture zeros in the fermion mass matrices, while preserving the correct
relationships with the low-energy data on quark and lepton masses. We outline a
procedure for defining texture zeros as suppressed entries in Yukawa matrices.
These texture zeros can account for the coexistence of the observed large
mixing in atmospheric neutrino oscillations with a hierarchy in the neutrino
masses, and offer the possibility of alignment of the quark and squark mass
matrices, and thus giving a solution to the supersymmetric flavor problem. A
requirement that the flavor symmetry commutes with the SU(5) grand unified
group can be used to explain the lepton mass hierarchies as well as the
neutrino parameters, including the large mixing observed in the atmospheric
neutrino data. We present one such model that yields a large atmospheric
neutrino mixing angle, as well as a solar neutrino mixing angle of order
$\lambda \simeq 0.22$.


title:
Validity of the Color Dipole Approximation for Diffractive Production of
  Heavy Quarkonium

abstract:
  We study the diffractive photo- and leptoproductions of $J / \psi$ and $\psi
'$ on the proton, and examine the validity of the small-size color dipole
approximation to the production of radially excited heavy quarkonium. The
dipole model predicts a small ratio of $\psi '$ to $J / \psi$ photoproduction
cross sections, which does not agree with experimental data. We show that this
discrepancy originates from a large transverse size of $\psi '$ which makes the
convergence of the transverse size expansion questionable, and the calculation
without the dipole approximation turns out to be consistent with the data.
Productions of $\Upsilon '(2S,3S)$ are also discussed, and the dipole
approximation is found to be reasonable for the $\Upsilon$-family.


title: Effect of light sigma-meson Production in ppbar --> 3 pi0 at rest

abstract:
  The pi0 pi0 mass spectra and angular distributions around KKbar -threshold
and at 1.5 GeV in ppbar (at rest) --> 3 pi0 in the Crystal Barrel experiment
are reanalyzed by applying the new method, which is consistent with unitarity
of S-matrix and expressed directly by resonance parameters. The effects of
light sigma-meson production are clearly seen to improve the fit with sigma, in
comparing with the fit without sigma.


title:
Gauge dependence and matching procedure of a nonrelativistic QCD
  boundstate formalism

abstract:
  We investigate gauge dependence of a nonrelativistic boundstate formalism
used in contemporary calculations. It is known that the effective Hamiltonian
of the boundstate system depends on the choice of gauge. We obtain the gauge
transformation charge of the Hamiltonian, by which gauge independence of the
mass spectrum and gauge dependences of the boundstate wave functions are
dictated. We raise two questions of practical and physical interest, and
provide answers to them.


title:
J/\Psi \to \phi \pi \pi (K \bar{K}) decays, chiral dynamcis and OZI
  violation

abstract:
  We have studied the invariant mass distributions of the \pi\pi and K \bar{K}
systems for invariant masses up to 1.2 GeV from the J/\Psi \to \phi
\pi\pi(K\bar{K}) decays. The approach exploits the connection between these
processes and the \pi\pi and K\bar{K} strange and non-strange scalar form
factors by considering the \phi meson as a spectator. The calculated scalar
form factors are then matched with the ones from next-to-leading order chiral
perturbation theory, including the calculation of the the K\bar{K} scalar form
factors. Final state interactions in the J/\Psi \to \phi \pi\pi (K\bar{K})
processes are taken into account as rescattering effects in the system of the
two pseudoscalar mesons. A very good agreement with the experimental data from
DM2 and MARK-III is achieved. Furthermore, making use of SU(3) symmetry, the
S-wave contribution to the \pi^+\pi^- event distribution in the J/\Psi \to
\omega \pi^+\pi^- reaction is also given and the data up to energies of about
0.7 GeV are reproduced. These decays of the J/\Psi to a vector and a pair of
pseudoscalars turn out to be very sensitive to OZI violating physics which we
parametrize in terms of a direct OZI violation parameter and the chiral
perturbation theory low energy constants L_4^r and L_6^r. These constants all
come out very different from zero, lending further credit to the statement that
the OZI rule is not operative in the scalar 0^{++} channel.


title: Prompt J/psi Polarization at the Tevatron

abstract:
  The polarization of prompt J/psi at the Tevatron is calculated within the
nonrelativistic QCD (NRQCD) factorization framework. The contribution from
radiative decays of P-wave charmonium states decreases, but does not eliminate,
the transverse polarization at large transverse momentum. The prediction agrees
with measurements from the CDF collaboration at intermediate values of p_T, but
disagrees at the large values of p_T measured.


title:
Single Pion Production in Neutrino Reactions and Estimates for
  Charge-Exchange Effects

abstract:
  We calculate single pion production by neutrinos in the resonance region. We
consider both charged and neutral current reactions on free protons and
neutrons. We present differential and total cross sections which can be
compared with experiments. Then we use these results to calculate the spectra
of the emerging pions including the Pauli suppression factor and rescattering
corrections for reactions in heavy nuclei. Our results will be useful for
studying single pion production and for investigating neutrino oscillations in
future experiments.


title: Cosmic ray signatures of massive relic particles

abstract:
  The possibility that the Fermi scale is the only fundamental energy scale of
Nature is under serious consideration at present, yet cosmic rays may already
have provided direct evidence of new physics at a much higher scale. The recent
detection of very high energy particles with no plausible astrophysical sources
suggests that these originate from the slow decays of massive particles
clustered in the halo of our Galaxy. Such particles had in fact been predicted
to exist beforehand with mass and lifetime in the range required to explain the
observations. I discuss recent work focussing on experimental tests of this
speculative but exciting idea.


title: Harry Lehmann and the analyticity unitarity programme

abstract:
  I try to describe the extremely fruitful interaction I had with Harry Lehmann
and the results which came out of the analyticity unitarity programme,
especially the proof of the Froissart bound, which, with recent and future
measurements of total cross-sections and real parts, remains topical.


title: CP Violation - A Brief Review

abstract:
  Some past, present, and future aspects of CP violation are reviewed. The
discrete symmetries C, P, and T are introduced with an example drawn from
Maxwell's Equations. The history of the discovery of CP violation in the kaon
system is described briefly, and brought up-to-date with a review of recent
results on kaon decays. The candidate theory of CP violation, based on phases
in the Cabibbo-Kobayashi-Maskawa (CKM) matrix, will be tested by studies of $B$
mesons, both in decays to CP eigenstates and in ``direct'' decays; we will soon
learn a great deal more about whether the CKM picture is self-consistent.
Future measurements are noted and some brief remarks are made about the
``other'' manifestation of CP violation, the baryon asymmetry of the Universe.


title:
The Simplest Resonant Spin--Flavour Solution to the Solar Neutrino
  Problem

abstract:
  We re-analyse the resonant spin-flavour (RSF) solutions to the solar neutrino
problem in the framework of analytic solutions to the solar
magneto-hydrodynamics (MHD) equations. By substantially eliminating the
arbitrariness associated to the magnetic field profile due to both mathematical
consistency and physical requirements we propose the simplest scheme (MHD-RSF,
for short) for solar neutrino conversion using realistic static MHD solutions.
Using such effective two-parameter scheme we perform the first global fit of
the recent solar neutrino data, including event rates as well as zenith angle
distributions and recoil electron spectra induced by solar neutrino
interactions in Superkamiokande. We compare quantitatively our simplest MHD-RSF
fit with vacuum oscillation (VAC) and MSW-type (SMA, LMA and LOW) solutions to
the solar neutrino problem using a common well-calibrated theoretical
calculation and fit procedure. We find our MHD-RSF fit to be somewhat better
than those obtained for the favored neutrino oscillation solutions, though not
in a statistically significant way. We briefly discuss the prospects to
disentangle our MHD-RSF scenario at future solar neutrino experiments, giving
some predictions for the SNO experiment.


title:
Soft SUSY Breaking, Dilaton Domination and Intermediate Scale String
  Models

abstract:
  We present an analysis of the low-energy implications of an intermediate
scale ~10^{11} GeV string theory.
  We mainly focus on the evolution of the physical parameters under the
renormalisation group equations (RGEs) and find several interesting new
features that differ from the standard GUT scale or Planck scale scenarios. We
give a general discussion of soft supersymmetry breaking terms in type I
theories and then investigate the renormalization group running. In the dilaton
domination scenario, we present the sparticle spectra, analyzing constraints
from charge and colour breaking, fine tuning and radiative electroweak symmetry
breaking. We compare with the allowed regions of parameter space when the RGEs
start running at the standard GUT or the intermediate scales, and find quite
remarkably that the dilaton dominated supersymmetry breaking scenario, which is
essentially ruled out from constraints on charge and colour breaking if the
fundamental scale is close to the Planck mass, is allowed in a large region of
parameter space if the fundamental scale is intermediate.


title: Quasivacuum solar neutrino oscillations

abstract:
  We discuss in detail solar neutrino oscillations with \delta m^2/E in the
range [10^-10,10^-7] eV^2/MeV. In this range, which interpolates smoothly
between the so-called ``just-so'' and ``Mikheyev-Smirnov-Wolfenstein''
oscillation regimes, neutrino flavor transitions are increasingly affected by
matter effects as \delta m^2/E increases. As a consequence, the usual vacuum
approximation has to be improved through the matter-induced corrections,
leading to a ``quasi-vacuum'' oscillation regime. We perform accurate numerical
calculations of such corrections, using both the true solar density profile and
its exponential approximation. Matter effects are shown to be somewhat
overestimated in the latter case. We also discuss the role of Earth crossing
and of energy smearing. Prescriptions are given to implement the leading
corrections in the quasi-vacuum oscillation range. Finally, the results are
applied to a global analysis of solar nu data in a three-flavor framework.


title: Lepton Flavor Violation and Bilinear R-parity Violation

abstract:
  We examine some flavor changing processes such as rare leptonic decays of the
long-lived neutral kaon, muon-electron conversion in nuclei and radiative muon
decay which are induced by the combined effects of bilinear and trilinear
R-parity violations. These processes are used to put strong constraints on
certain products of the bilinear and trilinear couplings. We also discuss the
constraints on R-parity violation from neutrino masses and compare them with
the constraints from flavor changing decay processes. Large range of parameter
space satisfying the constraints from neutrino masses can be excluded by the
flavor changing processes considered in this paper, and also vice versa.


title:
Super-Kamiokande 0.07 eV Neutrinos in Cosmology: Hot Dark Matter and the
  Highest Energy Cosmic Rays

abstract:
  Relic neutrinos with mass in the range indicated by Super-Kamiokande results
if neutrino masses are hierarchial (about 0.07 eV) are many times deemed too
light to be cosmologically relevant. Here we remark that these neutrinos may
significantly contribute to the dark matter of the Universe (with a large
lepton asymmetry $L$) and that their existence might be revealed by the
spectrum of ultra high energy cosmic rays (maybe even in the absence of a large
$L$).


title:
Properties of the Langevin and Fokker-Planck equations for scalar fields
  and their application to the dynamics of second order phase transitions

abstract:
  I consider several Langevin and Fokker-Planck classes of dynamics for scalar
field theories in contact with a thermal bath at temperature T. These models
have been applied recently in the numerical description of the dynamics of
second order phase transitions and associated topological defect formation as
well as in other studies of these critical phenomena. Closed form solutions of
the Fokker-Planck equation are given for the harmonic potential and a dynamical
mean-field approximation is developed. These methods allow for an analytical
discussion of the behavior of the theories in several circumstances of interest
such as critical slowing down at a second order transition and the development
of spinodal instabilities. These insights allow for a more detailed
understanding of several numerical studies in the literature.


title:
Softly Broken Supersymmetric Gauge-Higgs-Yukawa Theories as
  Renormalizable Composite Models

abstract:
  We examine the (softly broken) supersymmetric gauge-Higgs-Yukawa theories
satisfying the compositeness conditions at a certain scale. In these theories
the Higgs superfields can be regarded as the chiral composite fields. It is
found that there are the fundamental theories, which contain the dimension 5
interactions and the hard SUSY breaking in perturbation, turn to be
renormalizable and also softly broken theories in the nonperturbative
framework. The soft SUSY breaking parameters as well as the Yukawa coupling in
the corresponding gauge-Higgs-Yukawa theories are restricted by the
renormalization group invariant relations.


title:
Inclusive charmless semileptonic decay of \Lambda_b and Br(b ---> X_u l
  \nu_l)

abstract:
  We study the inclusive charmless semileptonic decay of $\Lambda_b$,
$\Lambda_b \to X_u l \nu_l$, in the framework of heavy quark expansion and find
that the rate is substantially enhanced by spectator effect. We obtain $Br(b
\to X_u l \nu_l)$ to be $1.13 \times 10^{-3}$ for $|V_{ub}| = 3.3 \times
10^{-3}$. We discuss our result in light of the recent LEP measurements of the
charmless semileptonic branching ratio where such enhancement was not taken
into account in extracting $|V_{ub}|$.


title: Renormalization group effect and a democratic-type neutrino mass matrix

abstract:
  In our previous paper, we proposed the democratic-type neutrino mass matrix
which gives interesting predictions, $\theta_{23}=-\frac{\pi}4$, $|\tan
\theta_{12}|=\sqrt{2-3\sin^2 \theta_{13}}$ and $\delta=\frac {\pi}2$, where
$\theta_{ij}$ is the mixing angle between mass eigenstates $\nu_i$ and $\nu_j$,
and $\delta$ is the CP violation angle in the standard parameterization of
mixing matrix. In this paper, we examined how predictions behave at $m_Z$ by
assuming that they are given at the right-handed neutrino mass scale, $M_R$.


title:
Neutrino Majorana Mass and Baryon Number of the Universe below the
  Electroweak Symmetry breaking Scale

abstract:
  If the neutrino is Majorana type and the electroweak phase transition is
second or weak first order, neutrino-induced interactions together with
sphaleron transitions have the potential to erase a previously generated baryon
asymmetry of the universe. Taking correctly into account the evolution of the
vacuum expectation of the Higgs field the effective light neutrino masses are
constrained to be lighter than order 10 MeV, while the effective heavy masses
are constrained to be heavier than order 10^7 GeV.


title: Off-shell structure of the anomalous Z and gamma self-couplings

abstract:
  We establish the general off-shell structure of the three neutral gauge boson
self-couplings V1*V2*V3*, with applications to the Z*Z*Z*, Z*Z*gamma*,
gamma*gamma*Z* cases. New coupling forms appear which do not exist when two
gauge bosons are on-shell. We give the contribution arising from a fermionic
triangle loop. It covers both the standard model (SM) and possible new physics
(NP) contributions like those arising in the MSSM. For what concerns NP
contributions with a high scale, we discuss the validity of an effective
Lagrangian involving a limited set of parameters. Finally we write the general
expression of the V1*V2*V3*-vertex contribution to the e+e- to (f(bar)
f)+(f'(bar) f') amplitude.


title: Signatures of heavy Majorana neutrinos and HERA's isolated lepton events

abstract:
  The graph of neutrinoless double beta decay is applied to HERA and
generalized to final states with any two charged leptons. Considered is the
case in which one of the two escapes typical identification criteria and the
case when a produced tau decays hadronically. Both possibilities give one
isolated lepton with high transverse momentum, hadronic activity and an
imbalance in transverse momentum. We examine the kinematical properties of
these events and compare them with the high p_T isolated leptons reported by
the H1 collaboration. Their positive charged muon events can be explained by
the ``double beta'' process and we discuss possibilities for the precise
determination which original final state produced the single isolated lepton.
To confirm our hypothesis one should search in the data for high pseudorapidity
and/or low p_T leptons or for additional separated jets.


title:
Primordial Black Holes from Non-Equilibrium Second Order Phase
  Transition

abstract:
  The collapse of sufficiently large closed domain wall produced during second
order phase transition in the vacuum state of a scalar field can lead to the
formation of black hole. The origin of domain walls with appropriate size and
energy density could be a result of evolution of an effectively massless scalar
field at the inflational epoch. We demonstrate that in this case the situation
is valued when there are compact domains of less favorable vacuum surrounded by
a sea of another vacuum. Each domain has a surface composed of vacuum wall that
stores a significant amount of energy, and can collapse into the black hole.
This offers the way of massive primordial black holes formation in the early
Universe.


title: Quantum Field Theory at Finite Temperature: An Introduction

abstract:
  In these notes we review some properties of Statistical Quantum Field Theory
at equilibrium, i.e Quantum Field Theory at finite temperature. We explain the
relation between finite temperature quantum field theory in (d,1) dimensions
and statistical classical field theory in d+1 dimensions. This identification
allows to analyze the finite temperature QFT in terms of the renormalization
group and the theory of finite size effects of the classical theory. We discuss
in particular the limit of high temperature (HT) or the situation of finite
temperature phase transitions. There the concept of dimensional reduction plays
an essential role. Dimensional reduction in some sense reflects the known
property that quantum effects are not important at high temperature. We
illustrate these ideas with several standard examples, phi^4 field theory, the
non-linear sigma model and the Gross-Neveu model, gauge theories. We construct
the corresponding effective reduced theories at one-loop order, using the
technique of mode expansion of fields in the imaginary time variable. In models
where the field is a vector with N components, the large N expansion provides
another specially convenient tool to study dimensional reduction.


title:
Scale Factor in Double Parton Collisions and Parton Densities in
  Transverse Space

abstract:
  The scale factor $\sigma_{eff}$, which characterizes double parton collisions
in high energy hadron interactions, is a direct manifestation of the
distribution of the interacting partons in transverse space, in such a way that
different distributions give rise to different values of $\sigma_{eff}$ in
different double parton collision processes. We work out the value of the scale
factor in a few reactions of interest, in a correlated model of the
multi-parton density of the proton recently proposed.


title:
Reconciliation of the Measurement of Parity-Nonconservation in Cs with
  the Standard Model

abstract:
  Contributions from the Breit interaction in atomic-structure calculations
account for 1.3sigma of the previously reported 2.5sigma deviation from the
Standard Model in the 133Cs weak charge [S.C. Bennett and C.E. Wieman, Phys.
Rev. Lett. 82, 2484 (1999)]. The updated corrections for the neutron
distribution reduce the discrepancy further to 1.0sigma. The updated value of
the weak charge is Q_W(133Cs) = -72.65(28)_{expt}(34)_{theor}.
  The present analysis is a higher-order extension of previous calculation [A.
Derevianko, E-print physics/0001046].


title: Summing Sudakov logarithms in B -> X_s + gamma in effective field theory

abstract:
  We construct an effective field theory valid for processes in which highly
energetic light-like particles interact with collinear and soft degrees of
freedom, using the decay B -> X_s + gamma near the endpoint of the photon
spectrum, x = 2 E_gamma / m_b -> 1, as an example. Below the scale mu=m_b both
soft and collinear degrees of freedom are included in the effective theory,
while below the scale mu=m_b sqrt{x-y}, where 1-y is the lightcone momentum
fraction of the b quark in the B meson, we match onto a theory of bilocal
operators. We show that at one loop large logarithms cancel in the matching
conditions, and that we recover the well known renormalization group equations
that sum leading Sudakov logarithms.


title:
Basis-independent analysis of the sneutrino sector in R-parity violating
  supersymmetry

abstract:
  In R-parity-violating supersymmetric models (with a conserved baryon number),
there are no quantum numbers that distinguish the lepton-doublet and down-type
Higgs supermultiplets. As a result, the R-parity-violating parameters depend on
the basis choice for these superfields, although physical observables are
independent of the choice of basis. This paper presents a basis-independent
computation of the sneutrino/antisneutrino squared-mass splitting in terms of
basis-independent quantities. Techniques are developed for an arbitrary number
of sneutrino generations; specific results are provided for the one, two and
three generation cases.


title: TeV scale weak interactions: inclusive vs. exclusive observables

abstract:
  Hard processes at the TeV scale exhibit enhanced (double log) EW corrections,
that need resummation in view of the high level of precision of Next Linear
Colliders. The fact that the weak sector is spontaneously broken causes some
peculiarities with respect to unbroken theories like QCD. For observables that
are exclusive with respect to $W,Z$ emission, some peculiar technical problems
have yet to be solved. Surprisingly, double logarithmic enhancements are
present even for inclusive observables like $e^+e^-\to$ hadrons, leading to
violation of the Bloch-Nordsieck theorem. The last effect is particularly
important, producing weak effects that in some cases compete in magnitude with
the strong ones.


title: Analytical Heavy Quark Expansion in the 't Hooft Model

abstract:
  We present a number of exact relations for the heavy quark limit and develop
an analytical 1/m_Q expansion for heavy mesons in the 't Hooft model. Among the
new results are relation 3\mu_\pi^2=\bar\Lambda^2 - m_{sp}^2+\beta^2, 1/m_Q
corrections to the decay constants, to the kinetic expectation values and
1/m_Q^2 nonperturbative corrections to the B->D amplitude at zero recoil. The
properties of the IW functions are addressed and the small velocity sum rules
are verified.


title: Parton Scattering at Small-x and Scaling Violation

abstract:
  Scaling violation of inclusive jet production at small-$x$ in hadron
scattering with increasing total collision energy is discussed. Perturbative
QCD based on the factorisation theorem for hard processes and GLAPD evolution
equations predicts a minimum for scaled cross-section ratio that depends on jet
rapidity. Studies of such a scaling violation can reveal a vivid indication of
new dynamical effects in the high-energy limit of QCD. The BFKL effects, which
seem to be seen in recent L3 data at CERN LEP2, should give different results
from GLAPD predictions.


title: Recent results in Lorentz and CPT tests

abstract:
  This talk summarizes some recent experimental constraints on Lorentz and CPT
violation.


title: Chiral Symmetry and the Parity-Violating $NN\pi$ Yukawa Coupling

abstract:
  We construct the complete SU(2) parity-violating (PV) $\pi, N, \Delta$
interaction Lagrangian with one derivative, and calculate the chiral
corrections to the PV Yukawa $NN\pi$ coupling constant $h_\pi$ through ${\cal
O}(1/\Lambda_\chi^3)$ in the leading order of heavy baryon expansion. We
discuss the relationship between the renormalized $\hpi$, the measured value of
$\hpi$, and the corresponding quantity calculated microscopically from the
Standard Model four-quark PV interaction.


title: Photon-Photon Interaction in a Photon Gas

abstract:
  Using the effective Lagrangian for the low energy photon-photon interaction
the lowest order photon self energy at finite temperature and in
non-equilibrium is calculated within the real time formalism. The Debye mass,
the dispersion relation, the dielectric tensor, and the velocity of light
following from the photon self energy are discussed. As an application we
consider the interaction of photons with the cosmic microwave background
radiation.


title: Calculational techniques (not only) for single top production

abstract:
  A next-to-leading order calculation for single top production including
spin-dependent observables requires efficient techniques for the calculation of
the relevant loop amplitudes. We discuss the adaption of dimensional
regularization, the spinor helicity method and of tensor integral reduction
algorithms to these needs.


title:
A Numerical Analysis to the {$\pi$} and {K} Coupled--Channel Scalar
  Form-factor

abstract:
  A numerical analysis to the scalar form-factor in the $\pi\pi$ and KK
coupled--channel system is made by solving the coupled-channel dispersive
integral equations, using the iteration method. The solutions are found not
unique. Physical application to the $\pi\pi$ central production in the $pp\to
pp\pi\pi$ process is discussed based upon the numerical solutions we found.


title: Implications of Improved Upper Bounds on $|\Delta L|=2$ Processes

abstract:
  We discuss implications of improved upper bounds on the $|\Delta L|=2$
processes (i) $K^+ \to \pi^- \mu^+ \mu^+$, from an experiment at BNL, and (ii)
$\mu^- \to e^+$ conversion, from an experiment at PSI. In particular, we
address the issue of constraints on neutrino masses and mixing, and on
supersymmetric models with R-parity violation.


title: Higgs Mechanism and Bulk Gauge Boson Masses in the Randall-Sundrum Model

abstract:
  Assuming the breaking of gauge symmetries by the Higgs mechanism, we consider
the associated bulk gauge boson masses in the Randall-Sundrum background. With
the Higgs field confined on the TeV-brane, the W and Z boson masses can
naturally be an order of magnitude smaller than their Kaluza-Klein excitation
masses. Current electroweak precision data requires the lowest excited state to
lie above about 30 TeV, with fermions on the TeV-brane. This bound is reduced
to about 10 TeV if the fermions reside sufficiently close to the Planck-brane.
Thus, some tuning of parameters is needed. We also discuss the bulk Higgs case,
where the bounds are an order of magnitude smaller.


title:
Low $Q^2$ wave-functions of pions and kaons and their parton
  distribution functions

abstract:
  We study the low $Q^2$ wave-functions of pions and kaons as an expansion in
terms of hadron-like Fock state fluctuations. In this formalism, pion and kaon
wave-functions are related one another. Consequently, the knowledge of the pion
structure allows the determination of parton distributions in kaons. In
addition, we show that the intrinsic (low $Q^2$) sea of pions and kaons are
different due to their different valence quark structure. Finally, we analize
the feasibility of a method to extract kaon's parton distribution functions
within this approach and compare with available experimental data.


title: Neutrino Masses and the Gluino Axion Model

abstract:
  We extend the recently proposed gluino axion model to include neutrino
masses. We discuss how the canonical seesaw model and the Higgs triplet model
may be realized in this framework. In the former case, the heavy singlet
neutrinos are contained in superfields which do not have any vacuum expectation
value, whereas the gluino axion is contained in one which does. We also
construct a specific renormalizable model which realizes the mass scale
relationship $M_{SUSY} \sim f_a^2/M_U$, where $f_a$ is the axion decay constant
and $M_U$ is a large effective mass parameter.


title: Meson decay in an independent quark model

abstract:
  Leptonic decay widths and leptonic decay constants of light vector mesons and
weak leptonic decay widths and weak decay constants of light and heavy
pseudoscalar mesons have been studied in a field- theoretic framework based on
the independent quark model with a scalar- vector power-law potential. The
results are in very good agreement with the experimental data.


title: Parametrizing and rephasing neutrino mixing

abstract:
  Neutrino mixing in the standard model extensions, both renormalizable and
effective, with arbitrary numbers of the singlet and left-handed doublet
neutrinos is investigated in a systematic fashion. The charged and neutral (the
Z and Higgs mediated)lepton currents are written under general Majorana
condition, and the odservable independence of the choice of the condition, the
rephasing invariance, is studied. A parametrization of the neutrino mixing
matrices in the doublet-singlet factorized form is developed. Its relationship
with the see-saw mechanism is shown in the limit of a small doublet-singlet
mixing. The structure of the mixing matrices relevant to the neutrino
oscillation experiments is explicated.


title:
Time Dependent Analysis of Decays $\Lambda_b\to \Lambda +D^0$ and
  $\Lambda_b\to \Lambda +\bar{D}^0$

abstract:
  The time-dependent analysis of the decays $\Lambda_b\to \Lambda +D^0(t)$ and
$\Lambda_b\to \Lambda +\bar{D}^0(t)$ is discussed. The effect of particle
mixing due to time evolution of $D^0$ and $\bar{D}^0$ on the observables for
these decays viz the branching ratio of decay widths and the asymmetry
parameters $\alpha ,\beta$ and $\gamma$ are analysed. It is shown that it is
possible to extract information about $(\Delta m/\Gamma)\sin \hat{\gamma}$ from
the experimental data for these observables. Here $\Delta
m=m_{D_1^0}-m_{D_2^0},\Gamma$ is the decay widths for $D^{\prime}s$ and
$\hat{\gamma}$ is the weak phase.


title:
From CKM Matrix to MNS Matrix: A Model Based on Supersymmetric $SO(10)
  \times U(2)_{F}$ Symmetry

abstract:
  We construct a realistic model based on SUSY SO(10) with U(2) flavor
symmetry. In contrast to the commonly used effective operator approach,
$126-$dimensional Higgses are used to construct the Yukawa sector. R-parity
symmetry is thus preserved at low energies. The Dirac and right-handed Majorana
mass matrices in our model have very small mixing, and they combine with the
seesaw mechanism resulting in a large leptonic mixing. The symmetric mass
textures arising from the left-right symmetry breaking chain of SO(10) give
rise to very good predictions; 15 masses (including 3 right-handed Majorana
neutrino masses) and 6 mixing angles are predicted by 11 parameters. Both the
vacuum oscillation and LOW solutions are favored for the solar neutrino
problem.


title: Grand Unified Theories without the Desert

abstract:
  We present a Grand Unified Theory (GUT) that has GUT fields with masses of
the order of a TeV, but at the same time preserves (at the one-loop level) the
success of gauge-coupling unification of the MSSM and the smallness of proton
decay operators. This scenario is based on a five-dimensional theory with the
extra dimension compactified as in the Randall-Sundrum model. The MSSM gauge
sector and its GUT extension live in the 5D bulk, while the matter sector is
localized on a 4D boundary.


title: Hadronic Properties from Lattice QCD with Dynamical Quarks

abstract:
  The lattice regularization of QCD provides us with the most systematic way of
computing non-perturbative properties of hadrons directly from the first
principles of QCD. The recent rapid development of parallel computers has
enabled us to start realistic and systematic simulations with dynamical quarks.
In this paper, I report on the first results from recent systematic studies on
the lattice with dynamical quarks.


title:
Sneutrino-Higgs mixing in WW and ZZ production in supersymmetry with
  R-parity violation

abstract:
  We consider new s-channel scalar exchanges in e+e- -> ZZ,W+W- in
supersymmetry with a small lepton number violation. We show that a small
bilinear R-parity violating term which leads to sneutrino--Higgs mixing can
give rise to a significant scalar resonance enhancement in e+e- -> ZZ,W+W-. We
use the LEP2 measurements of the WW and ZZ cross-sections to place useful
constraints on this scenario. We also find, under conservative assumptions on
the relevant parameter space involved, that such an exchange of the
sneutrino-like admixture in e+e- -> ZZ,W+W- may be accessible to a 500 GeV e+e-
collider.


title: Neutrino Masses and Mixing from Bilinear R-Parity Violation

abstract:
  Neutrino masses and mixing are generated in a supersymmetric standard model
when R-parity is violated in bilinear mass terms. The mixing matrix among the
neutrinos takes a restrictive form if the lepton flavor universality holds in
the R-parity violating soft masses. It turns out that only the small angle MSW
solution to the solar neutrino problem is consistent with the result of the
CHOOZ experiment and the atmospheric neutrino data.


title: Roy equation analysis of pi pi scattering

abstract:
  We analyze the Roy equations for the lowest partial waves of elastic pi pi
scattering and demonstrate that the two S-wave scattering lengths a_0^0 and
a_0^2 are the essential parameters in the low energy region: Once these are
known, the available experimental information determines the behaviour near
threshold to within remarkably small uncertainties. An explicit numerical
representation for the energy dependence of the S- and P-waves is given and it
is shown that the threshold parameters of the D- and F-waves are also fixed
very sharply in terms of a_0^0 and a^2_0. In agreement with earlier work, which
is reviewed in some detail, we find that the Roy equations admit physically
acceptable solutions only within a band of the (a_0^0,a_0^2) plane. We show
that the data on the reactions e+e- -> pi pi and tau -> pi pi nu reduce the
width of this band quite significantly. Furthermore, we discuss the relevance
of the decay K -> pi pi e nu in restricting the allowed range of a_0^0,
preparing the grounds for an analysis of the forthcoming precision data on this
decay and on pionic atoms. We expect these to reduce the uncertainties in the
two basic low energy parameters very substantially, so that a meaningful test
of the chiral perturbation theory predictions will become possible.


title: Brane-Universe in Six Dimensions

abstract:
  Growing non-singular solution of 6-dimensional Einstein equations for the
4-brane in infinite transversal 2-space is found. This solution provides
gravitational trapping of matter and 4-dimensional gravity on the brane without
extra delta-like source. The suitable solution exists in the case of the
(2+4)-space and not exists for the (1+5)-signature.


title: CP Violation from Supersymmetry in Hyperon Decays

abstract:
  We point out that in supersymmetric models the direct CP violating asymmetry
$A(\Lambda^0_-)$ in $\Lambda \to \pi^- p$ can be of $O(10^{-3})$ in the range
to be probed by the current E871 experiment.


title: Phase structure of the QCD vacuum in a magnetic field at low temperature

abstract:
  We study the QCD phase structure in magnetic field $H$ at low temperature
$T$. The hadronic phase free energy in a constant homogeneous magnetic field is
calculated in one-loop approximation of the chiral perturbation theory. The
dependence of the quark and gluon condensates upon the temperature and field
strength is found. It is shown that the chiral phase transition order parameter
$<\bar q q>$ remains constant provided field strength and temperature are
related via $H=const \cdot T^2$.


title: Subleading Sudakov Logarithms in Electroweak Processes

abstract:
  Recent results for the asymptotic behavior of fermion scattering amplitudes
in the Sudakov limit are presented including next-to-leading logarithmic
corrections. These are used for the analysis of the dominant electroweak
corrections to the fermion-antifermion pair production in $e^+e^-$ annihilation
at high energy.


title:
Can instantons saturate the large mass of the $\eta'$ meson in the
  chiral limit?

abstract:
  Using the trace anomaly and low energy relations, as well as Witten-Veneziano
formula for the mass of the $\eta'$ meson, the chiral topology of the QCD
nonperturbative instanton vacuum has been numerically evaluated. Our formalism
makes it possible to express the topological susceptibility and the mass of the
$\eta'$ meson as a functions of the instanton number density in the chiral
limit. We have explicitly shown that the topological susceptibility in this
case is approximately one fours and one half of its phenomenological value at
instanton number densities in the chiral limit, 0.5 fm^{-4} and 1.0 fm^{-4},
respectively. Thus the instanton contributions substantially underestimate the
mass of the $\eta'$ meson which still remains large in the chiral limit. With
the help of the above-mentioned Witten-Veneziano formula, we derived an
absolute lower bounds for the pion decay constant and the mass of the $\eta'$
meson in the chiral limit.


title: The $b\to s\gamma$ decay in SUSY models with non-universal A-terms

abstract:
  We analyse the predictions for the inclusive branching ratio for $b\to
s\gamma$ decay in a class of string-inspired SUSY models with non-universal
soft-breaking A-terms. These models are particularly interesting since the
non-universality of the A-terms plays an important role in providing new
significant contributions to CP violation effects in kaon physics while
respecting the severe bounds on electric dipole moments. We show that $b\to
s\gamma$ do not severely constrain the non-universality of these models. In
particular, at low $\tan\beta$ $(\tan\beta\simeq 2)$, our predictions are close
to the universal case. For large $\tan\beta$ ($\tan\beta \gsim 15$),the effect
of non-universality is enhanced and stronger constraints hold. We find that the
parameter regions which are important for generating sizeable contribution to
$\epsilon'/\epsilon$, of order $2 \times 10^{-3}$, are not excluded.


title: The status of NLL BFKL

abstract:
  This talk summarises the current status of the NLL corrections to BFKL
physics and discusses the question of small-x factorisation.


title: Electroweak Physics in Six-Fermion Processes at Future Colliders

abstract:
  Recent developments in the field of complete electroweak tree-level
calculations for six-fermion final states in e+ e- collisions are briefly
reviewed. Particular attention is given to top-quark and Higgs boson physics,
which are items of primary importance at the Next Linear Collider. The
relevance of electroweak backgrounds and finite-width effects is discussed,
showing the importance of complete calculations for precision studies at the
colliders operating in the TeV energy range.


title: Top-quark couplings to TeV resonances at future lepton colliders

abstract:
  We study the processes $W_L W_L \to t \bar t$ and $W_L Z_L \to t\bar b (\bar
t b)$ at future lepton colliders as probes of the couplings of the top quark to
resonances at the TeV scale. We consider the cases in which the dominant low
energy feature of a strongly interacting electroweak symmetry breaking sector
is either a scalar or a vector resonance with mass near 1 TeV. We find that
future lepton colliders with high energy and high luminosity have great
potential to sensitively probe these physics scenarios. In particular, at a 1.5
TeV linear collider with an integrated luminosity of 200 fb$^{-1}$, we expect
about 120 events for either a scalar or a vector to decay to $t\bar t, t \bar
b$. Their leading partial decay widths, which characterize the coupling
strengths, can be statistically determined to about 10% level.


title: Loops and legs beyond perturbation theory

abstract:
  Within the non-perturbative 1/N expansion, we discuss numerical methods for
calculating multi-loop Feynman graph needed to derive physical scattering
amplitudes. We apply higher order 1/N methods to the scalar sector of the
standard model, and show the existence of a mass saturation effect. The mass
saturation has direct implications for future searches at the LHC and at
possible muon colliders.


title: Higgs Boson Decays to CP-odd Scalars at the Tevatron and Beyond

abstract:
  In extended Higgs models, the Higgs boson may decay into a pair of light
CP-odd scalars, with distinctive collider signatures. We study the ensuing
Higgs signals at the upgraded Tevatron, considering the subsequent decays of
the scalars into pairs of gluons or photons. For CP-odd scalars lighter than a
few GeV, the Higgs boson manifests itself as a diphoton resonance and can be
discovered up to masses of a few hundred GeV. For heavier CP-odd scalars the
reach extends at most up to $M_h\sim 120$ GeV. We also discuss the capabilities
of the LHC and lepton colliders in these channels.


title: Four-Fermion Production in Electron-Positron Collisions

abstract:
  This report summarises the results of the four-fermion working group of the
LEP2-MC workshop, held at CERN from 1999 to 2000. Recent developments in the
calculation of four-fermion processes in electron-positron collisions at LEP-2
centre-of-mass energies are presented, concentrating on predictions for four
main reactions: W-pair production, visible photons in four-fermion events,
single-W production and Z-pair production. Based on a comparison of results
derived within different approaches, theoretical uncertainties on these
predictions are established.


title:
Tau Neutrinos Underground: Signals of $\nu_\mu \to \nu_\tau$
  Oscillations with Extragalactic Neutrinos

abstract:
  The appearance of high energy tau neutrinos due to $\nu_\mu \to \nu_\tau$
oscillations of extragalactic neutrinos can be observed by measuring the
neutrino induced upward hadronic and electromagnetic showers and upward muons.
We evaluate quantitatively the tau neutrino regeneration in the Earth for a
variety of extragalactic neutrino fluxes. Charged-current interactions of the
upward tau neutrinos below and in the detector, and the subsequent tau decay
create muons or hadronic and electromagnetic showers. The background for these
events are muon neutrino and electron neutrino charged-current and
neutral-current interactions, where in addition to extragalactic neutrinos, we
consider atmospheric neutrinos. We find significant signal to background ratios
for the hadronic/electromagnetic showers with energies above 10 TeV to 100 TeV
initiated by the extragalactic neutrinos. We show that the tau neutrinos from
point sources also have the potential for discovery above a 1 TeV threshold. A
kilometer-size neutrino telescope has a very good chance of detecting the
appearance of tau neutrinos when both muon and hadronic/electromagnetic showers
are detected.


title: Soft Double-Diffractive Higgs Production at Hadron Colliders

abstract:
  We evaluate the non-perturbative contribution to the double-diffractive
production of the Higgs boson, which arises due to the QCD scale anomaly if the
mass of the Higgs M_H is smaller than the mass of the top quark M_T, M_H < M_T.
The cross section appears to be larger than expected from perturbative
calculations; we find \sigma_H = 0.019 - 0.14 pbarn at the Tevatron energy, and
\sigma_H = 0.01 - 0.27 pbarn at the energy of the LHC.


title: Chiral Vacuum Alignment in Dense QCD

abstract:
  We discuss an interesting possibility of nontrivial, quark-mass induced
chiral vacuum alignment in color-flavor locking phase of cold, dense QCD. With
the simplifying assumption that the gaps for quarks are identical to those of
antiquarks and the light quark masses are given by $m_u = m_d$ and $
m_s/m_d=15$, we find the true chiral vacuum can align only to one of the
discrete number of directions in the continuum of chiral vacua. The alignment
depends on the size of the diquark condensates, and the vacuum transitions
between the discrete vacua caused by the evolution of the diquark condensates
can be first order phase transition with vanishing or nonvanishing latent heat,
depending on the vacua involved. It is also shown that as $\mu \to \infty$,
where $\mu$ is the baryon chemical potential, parity is spontaneously broken
through the vacuum alignment.


title:
Measuring the Higgs CP Property through Top Quark Pair Production at
  Photon Linear Colliders

abstract:
  We present a model-independent study of the effects of a neutral Higgs boson
without definite CP-parity in the process $\gamma\gamma \to t\bar{t}$ around
the mass pole of the Higgs boson. Near the resonance pole, the interference
between the Higgs-exchange and the continuum amplitudes can be sizable if the
photon beams are polarized and helicities of the top and anti-top quarks are
measured. Study of these interference effects enables one to determine the CP
property of the Higgs boson completely. An example of the complete
determination is demonstrated in the context of the minimal supersymmetric
standard model.


title: EDM operator free from Schiff's theorem

abstract:
  We present generalized Schiff's transformation on electric dipole moments
(EDM) in quantum field theory. By the unitary transformation, the time and
parity violating interaction $i{ge\over 2} \bar \psi \sigma_{\mu \nu} \gamma_5
\psi F^{\mu \nu}$ is transformed into a new form, but its nonrelativistic
reduction has a unique form, which is free from Schiff's theorem. The
relativistic corrections to the new EDM operator turn out to be a small
increase to the EDM as given by $b_2 (\alpha Z)^2$ with $b_2 \simeq 2 $.
Therefore, the calculation of the EDM with nonrelativistic Hartree-Fock wave
functions presents the most conservative but reliable estimation for the
enhancement factor of the EDM in atoms.


title: Soft gluon effects in the extraction of higher twists at large Bjorken x

abstract:
  Existing data on the (unpolarised) transverse structure function of the
proton are analyzed for large values of the Bjorken variable x. The
leading-twist and a phenomenological higher-twist contributions are
simultaneously determined from a power correction analysis of the Nachtmann
moments for values of the squared four-momentum transfer between ~ 1 and 20
(GeV/c)**2. The results obtained adopting the next-to-leading order
approximation and those including the effects of soft gluon resummation are
compared. The sensitivity of the extraction of large-x higher twists to
high-order radiative corrections as well as to the value of alphas(MZ) is
illustrated.


title:
New Insights into the Perturbative Structure of Electroweak Sudakov
  Logarithms

abstract:
  To match the expected experimental precision at future linear colliders,
improved theoretical predictions beyond next-to-leading order are required. At
the anticipated energy scale of sqrt(s)=1 TeV the electroweak virtual
corrections are strongly enhanced by collinear-soft Sudakov logarithms of the
form log^2(s/M^2), with M being the generic mass scale of the W and Z bosons.
By choosing an appropriate gauge, we have developed a formalism to calculate
such corrections for arbitrary electroweak processes. As an example we consider
in this letter the process e^+e^- --> f fbar and study the perturbative
structure of the electroweak Sudakov logarithms by means of an explicit
two-loop calculation. In this way we investigate how the Standard Model, with
its mass gap between the photon and Z boson in the neutral sector, compares to
unbroken theories like QED and QCD. In contrast to what is known for unbroken
theories we find that the Sudakov logarithms are not exclusively given by the
so-called rainbow diagrams, owing to the mass gap and the charged-current
interactions. In spite of this, we nevertheless observe that the two-loop
corrections are consistent with an exponentiation of the one-loop corrections.
In this sense the Standard Model behaves like an unbroken theory at high
energies.


title: Finding eta_c' and h_c at HERA-B

abstract:
  The production of Charmonium states $\etacp$ and $\hc$ at fixed-target
experiment of $pN$ collisions at HERA-$B$ is considered. It is found that the
HERA-$B$ at DESY is one of the best machines in further confirming and
detecting these two kinds of Charmonia in the near future.


title: Large momentum transfer electroproduction of mesons

abstract:
  Assuming the proton's light-cone wave function to be dominated by small
parton virtualities and small intrinsic transverse momenta, we show that the
electroproduction amplitudes at large momentum transfer factorize into
parton-level subprocess amplitudes and form factors representing 1/x-moments of
skewed parton distributions. On the basis of a wave function overlap model for
the form factors we present detailed predictions for the electroproduction
cross sections. We also comment on large momentum transfer photoproduction.


title: Quantum Field Theory of the Laser Acceleration

abstract:
  After the historical background concerning the pressure of light, we derive
the quantum field theory force of the laser radiation acting on electron.
Numerically, we determine the velocity of an electron accelerated by laser
beam, after acceleration time $\Delta t = 1 {\rm s}$.


title: $\Delta G(x,\mu^2)$ from jet and prompt photon production at RHIC

abstract:
  We compare theoretical results for jet and prompt photon production in
polarized pp-collisions at RHIC obained with three different methods: a) the
unpolarized event generator PYTHIA combined with hadronic asymmetry weights
calculated from leading order formulae, b) the polarized event generator SPHINX
which treats the partonic helicity in the hard scattering and the initial state
shower explicitly, and c) parton generators which integrate next-to-leading
order QCD cross sections using Monte Carlo methods. Method a) requires far less
computer time than method b) but we find that it is too imprecise for precision
studies. The lacking treatment of partonic polarization in the initial state
shower results in relative deviations in the asymmetries of up to 20% relative
to SPHINX (method b)). As was to be expected, the event generator predictions
for the absolute cross sections differ significantly from the next-to-leading
order QCD calculations. But fortunately the asymmetries show a much better
agreement: relative deviations for prompt photon production for
parameterizations with medium and large $\Delta g(x,\mu^2)$ barely exceed 10%.
After fine tuning the parameters of the parton showers the same result can be
obtained for jet production.


title: New model for the neutrino mass matrix

abstract:
  I suggest a model based on a softly broken symmetry L_e - L_mu - L_tau and on
Babu's mechanism for two-loops radiative generation of the neutrino masses. The
model predicts that one of the physical neutrinos (nu_3) is massless and that
its component along the nu_e direction (U_e3) is zero. Moreover, if the
soft-breaking term is assumed to be very small, then the vacuum oscillations of
nu_e have almost maximal amplitude and solve the solar-neutrino problem. New
scalars are predicted in the 10 TeV energy range, and a breakdown of e-mu-tau
universality should not be far from existing experimental bounds.


title: Strangeness and Hadron Structure

abstract:
  The nucleon wave function may contain a significant component of ssbar pairs,
according to several measurements including the pi-nucleon sigma term, charm
production and polarization effects in deep-inelastic scattering. In addition,
there are excesses of phi production in LEAR and other experiments, above
predictions based the naive Okubo-Zweig-Iizuka rule, that may be explained if
the nucleon wave function contains a polarized ssbar component. This model also
reproduces qualitatively data on Lambda polarization in deep-inelastic neutrino
scattering. The strange component of the proton is potentially important for
other physics, such as the search for astrophysical dark matter.


title: Studying Indirect Violation of CP, T and CPT in a B-factory

abstract:
  In this work we analyze the observable asymmetries one can build from
entangled B-meson states, in order to extract information on the parameters
epsilon and delta which govern indirect violation of discrete symmetries. The
traditionally proposed observables, based on flavour tags, are not helpful for
the study of the Bd-system, where the tiny value of the width difference
between physical states clears up such asymmetry effects. Our study makes
instead use of CP tags in order to build new asymmetries where the different
parameters can be separated out. For this separation, it is decisive to achieve
a good time resolution in the measurement of entangled state decays.
Nevertheless, even with no temporal information, as would be the case in a
symmetric factory, it is still possible to extract some information on the
symmetries of the system. We discuss both genuine and non-genuine observables,
depending on whether absorptive parts can mimic or not asymmetry effects.


title: A general reduction method for one-loop N-point integrals

abstract:
  In order to calculate cross sections with a large number of particles/jets in
the final state at next-to-leading order, one has to reduce the occurring
scalar and tensor one-loop integrals to a small set of known integrals. In
massless theories, this reduction procedure is complicated by the presence of
infrared divergences. Working in n=4-2*epsilon dimensions, it will be outlined
how to achieve such a reduction for diagrams with an arbitrary number of
external legs. As a result, any integral with more than four propagators and
generic 4-dimensional external momenta can be reduced to box integrals.


title: Fermion Loops, conserved currents and single-W

abstract:
  The relevance of fermion loop corrections to four fermion processes at e+ e-
colliders is reviewed with regard to the recent extension to the case of
massive external particles and its application to single-W processes.


title:
Possible formulations for three-charged particles correlations in terms
  of Coulomb wave functions

abstract:
  The recent data for Bose-Einstein Correlations (BEC) of three-charged
particles obtained by NA44 Collaboration have been analysed using theoretical
formula with Coulomb wave functions. It has been recently proposed by Alt et
al. It turns out that there are discrepancies between these data and the
respective theoretical values. To resolve this problem we seek a possibly
modified theoretical formulation of this problem by introducing the degree of
coherence for the exchange effect due to the BEC between two-identical bosons.
As a result we obtain a modified formulation for the BEC of three-charged
particles showing good agreement with the data. Moreover, we investigate
physical connection between our modified formulation and the core-halo model
proposed by Csorgo et al. Our study indicates that the interaction region
estimated by the BEC of three-charged particles in the S + Pb collisions at 200
GeV/c per nucleon is equal to about 1.5 fm~1.8 fm.


title: Why odd-space and odd-time dimensions in even-dimesional spaces?

abstract:
  We are answering the question why 4-dimensional space has the metric 1+3 by
making a general argument from a certain type of equations of motion linear in
momentum for any spin (except spin zero) in any even dimension d. All known
free equations for non-zero spin for massless fields belong to this type of
equations. Requiring Hermiticity(This is a generalization of an earlier work
which shows that without assuming the Lorentz invariance -which in the present
work is assumed- the Weyl equation follows using Hermiticity.) of the equations
of motion operator as well as irreducibility with respect to the Lorentz group
representation, we prove that only metrics with the signature corresponding to
q time + (d - q) space dimensions with q being odd exist. Correspondingly, in
four dimensional space, Nature could only make the realization of 1+3
dimensional space.


title:
The on-shell massless planar double box diagram with an irreducible
  numerator

abstract:
  Using a Mellin-Barnes representation, we compute the on-shell massless planar
double box Feynman diagram with an irreducible scalar product of loop momenta
in the numerator. This diagram is needed in calculations of two loop
corrections to scattering processes of massless particles, together with the
double box without numerator calculated previously by Smirnov. We verify the
poles in epsilon of our result by means of a system of differential equations
relating the two diagrams, which we present in an explicit form. We verify the
finite part with an independent numerical check.


title: Can Nucleon Tell Where the Couplings Run?

abstract:
  The comparison of magnetic moments of neutron and proton reveals three
possible states of a nucleon with the same correction of 0.033 for the central
quarks. This may be interpreted as the contribution of a universal coupling as
the common value where all the running couplings unite.


title: Influence of the U(1)_A Anomaly on the QCD Phase Transition

abstract:
  The SU(3)_{r} \times SU(3)_{\ell} linear sigma model is used to study the
chiral symmetry restoring phase transition of QCD at nonzero temperature. The
line of second order phase transitions separating the first order and smooth
crossover regions is located in the plane of the strange and nonstrange quark
masses. It is found that if the U(1)_{A} symmetry is explicitly broken by the
U(1)_{A} anomaly then there is a smooth crossover to the chirally symmetric
phase for physical values of the quark masses. If the U(1)_{A} anomaly is
absent, then there is a phase transition provided that the \sigma meson mass is
at least 600 MeV. In both cases, the region of first order phase transitions in
the quark mass plane is enlarged as the mass of the \sigma meson is increased.


title: Nonleptonic charmless B decays: factorization vs perturbative QCD

abstract:
  We compare the factorization approach, the perturbative QCD approach and the
Beneke-Buchalla-Neubert-Sachrajda approach to nonleptonic charmless $B$ meson
decays. We discuss their treatments of factorizable, nonfactorizable, and
annihilation contributions, infrared-cutoff and scale dependences, and strong
phases. It is proposed that measurement of CP asymmetries in two-body $B$ meson
decays provides an appropriate test of the these approaches.


title: Postdoctoral Working Report: Researches on Higgs and FCNC Physics

abstract:
  In this report, instead to give comprehensive review on two important
research fields during my first term postdoctoral working period: Higgs and
FCNC physics, I will collect part of my recently works on it. Charged Higgs is
the distinguished signature of new physics, in this report, I review my two
works on charged Higgs associated production with top quark and $W$ boson at
hardron colliders. Our researches show that these two charged Higgs production
mechanisms are important channel not only in finding charged Higgs, but also in
studying the quantum structure of new physics. Flavor Changing Neutral Current
(FCNC) processes are forbidden at tree level in the Standard Model (SM), so
they act as the ground to test quantum structure of the SM and also very
important channel in finding new physics beyond the SM. In this report, I focus
on the studies on FCNC processes on linear colliders and in B-factories.


title: 1/m_Q Corrections to the Heavy-to-Light-Vector Transitions in the HQET

abstract:
  Within the HQET, the heavy to light vector meson transitions are
systematically analyzed to the order of 1/m_Q. Besides the four universal
functions at the leading order, there are twenty-two independent universal form
factors at the order of 1/m_Q. Both the semileptonic decay B->\rho which is
relevant to the |V_{ub}| extraction, and the penguin induced decay B -> K^*
which is important to new physics discovering, depend on these form factors.
Phenomenological implications are discussed.


title: The Gluon Spin in the Chiral Bag Model

abstract:
  We study the gluon polarization contribution at the quark model
renormalization scale to the proton spin, $\Gamma$, in the chiral bag model. It
is evaluated by taking the expectation value of the forward matrix element of a
local gluon operator in the axial gauge $A^+=0$. It is shown that the confining
boundary condition for the color electric field plays an important role. When a
solution satisfying the boundary condition for the color electric field, which
is not the conventionally used but which we favor, is used, the $\Gamma$ has a
positive value for {\it all} bag radii and its magnitude is comparable to the
quark spin polarization. This results in a significant reduction in the
relative fraction of the proton spin carried by the quark spin, which is
consistent with the small flavor singlet axial current measured in the EMC
experiments.


title: Higgs or dijet production in double rapidity gap events

abstract:
  We quantify the rate of double diffractive Higgs/dijet production at $pp$ (or
$p\bar{p}$) colliders. The suppression due to QCD bremsstrahlung is calculated
perturbatively up to single $\log$ accuracy. The survival probability of the
rapidity gaps is discussed. A first comparison with experiment is made.


title:
Effects of non-factorizable metric on neutrino oscillation inside
  supernova

abstract:
  In this paper we construct the interaction potential between the dense
supernova core and neutrinos due to the exchange of light radions in the
Randall-Sundrum scenario. We then show that the radion exchange potential
affects the neutrino oscillation phenomenology inside the supernova
significantly if the radion mass is less than around 1 GeV. In order that the
Bethe-Wilson mechanism for heating the envelope and r-process neucleosynthesis
be operative, the radion mass must be greater than 1 GeV. Bounds on the radion
mass of the same order of magnitude can also be derived from TASSO and CLEO
data on B decays.


title:
Radiative $\phi$$-$meson decays and $\eta$-$\eta^\prime$ mixing: a QCD
  sum rule analysis

abstract:
  The radiative transitions $\phi \to \eta \gamma$ and $\phi \to \eta^\prime
\gamma$ are analysed using QCD sum-rules. The results we obtain for ${\cal
B}(\phi \to \eta \gamma)=(1.15 \pm 0.2) 10^{-2}$ and ${\cal B}(\phi \to
\eta^\prime \gamma)=(1.18 \pm 0.4) 10^{-4}$ are in very good agreement with
existing experimental data. The related issue of $\eta-\eta^\prime$ mixing is
discussed and we give predictions for the $\eta$ and $\eta^\prime$ decay
constants in the framework of a mixing scheme in the quark-flavour basis.


title:
Quark Mass Corrections to the Perturbative Thrust and its Effect on the
  determination of $\alpha_s$

abstract:
  We consider the effects of quark masses to the perturbative thrust in
$e^+e^-$ annihilation. In particular we show that perturbative power
corrections resulting from non-zero quark masses considerably alters the size
of the non-perturbative power corrections and consequently, significantly
changes the fitted value of $\alpha_s$.


title: Electroweak Sudakov logarithms in the Coulomb gauge

abstract:
  We describe a formalism for calculating electroweak Sudakov logarithms in the
Coulomb gauge. This formalism is applicable to arbitrary electroweak processes.
For illustration we focus on the specific reactions e^+e^- -> f \bar{f} and
e^+e^- -> W_T^+W_T^-, W_L^+W_L^-, which contain all the salient details of
dealing with the various types of particles. We discuss an explicit two-loop
calculation and have a critical look at the (non-)exponentiation and
factorisation properties of the Sudakov logarithms in the Standard Model.


title: Gluballs in the String Quark Model

abstract:
  It is shown that the eigenstates of the quantized simplest closed (elliptic)
Nambu -- Goto string, called glueballs, have quantum numbers
I^Gj^{PC}=0^+j^{++}. Lightest glueballs have spins j=0,1 and 2 and the same
mass 1500 +/- 20 MeV. They correspond to f_0(1500), f_1(1510) and f_2(1565)-
mesons. Next glueballs have j=0,1,2,3,4 and the same mass 2610 +/- 20 MeV. The
slope of the glueball Regge trajectories is twice as small as for q\bar
q-mesons. The intersept of the leading glueball trajectory - the pomeron Regge
trajectory - is 1.07 +/- 0.03


title: NLO Monte-Carlo approach in 1 or 2 jets Photoproduction

abstract:
  We present a method for calculating the photoproduction of jets at HERA based
on Next to Leading Logarithm QCD calculations. It is implemented in a
Monte-Carlo generator which allows us to easily compute any infra-red safe
cross sections for 1 or 2 jet observables using various jet reconstruction
algorithms. We focus on the possibility of extracting the gluon contents of the
photon and of the proton from present and future H1 and ZEUS data.


title: NN Scattering Phase Shifts in a Chiral Constituent Quark Model

abstract:
  We study the nucleon-nucleon interaction within a chiral constituent quark
model which reproduces succesfully the baryon spectra. We calculate the 3S1 and
1S0 phase shifts by using the resonating group method. They clearly indicate
the presence of a strong repulsive interaction at short distance, due to the
spin-flavor symmetry of the quark-quark interaction and of the quark
interchange between the two interacting nucleons. A sigma-exchange quark-quark
interaction, providing a medium-range attraction, helps to get closer to the
experimental phase shifts.


title: A Dual Gauge Model with Confinement

abstract:
  We reformulate the dual gauge model of the long-distance Yang-Mills theory in
terms of the two-point Wightman functions formalism. In the flux-tube scheme of
Abelian dominance and monopole condensation, the analytic expressions of both
monopole- and dual gauge boson-fields propagators are obtained. Formally, new
features of higher order quadratic equations for a monopole field are given.
Finally, we show how the rising-type potentials in the static system of color
charges are naturally derived.


title: Neutrino Oscillations Induced by Two-loop Radiative Mechanism

abstract:
  Two-loop radiative mechanism, when combined with an U(1)_{L'} symmetry
generated by L_e-L_\mu-L_\tau (=L'), is shown to provide an estimate of \Delta
m^2_{\odot}/\Delta m^2_{atm} $\sim$ \epsilon m_e/m_\tau, where \epsilon
measures the U(1)_{L'}-breaking. Since \Delta m^2_{atm} $\sim 3.5x10^{-3} eV^2,
we find that \Delta m^2_{\odot} $\sim$ \epsilon x10^{-6} eV^2, which will fall
into the allowed region of the LOW solution to the solar neutrino problem for
\epsilon $\sim$ 0.1.