title: Yukawa Deflected Gauge Mediation in Four Dimensions

abstract:
  We construct a four dimensional realization of a higher dimensional model,
Yukawa deflected gauge mediation, in which supersymmetry breaking is
communicated to the visible sector through both gauge and Yukawa interactions.
The reduction to four dimensions is achieved by `deconstructing' or
`latticizing' the extra dimension. Three sites (gauge groups) are sufficient to
reproduce the spectrum of the higher dimensional model. The characteristic
features of Yukawa deflected gauge mediation, in particular, alignment of
squarks and quarks, and a natural solution to the mu problem, carry over to the
deconstructed version of the model. We comment on the implications of our
results for a solution of the mu problem in the context of deconstructed
gaugino mediation.


title:
Parametric Resonance versus Forced Oscillation in Time-Evolution of
  Quantum Meson Fields

abstract:
  The time-evolution of quantum meson fields in O(4)-linear sigma model is
treated approximately. It is shown that the amplification of the amplitudes of
pion modes with low momenta occurs by means of both the parametric resonance
and the forced oscillation.


title:
Corrections For Two Photon Decays of chi_{c0} and chi_{c2} and Color
  Octet Contributions

abstract:
  Using the fact that the c-quark inside a charmonium moves with a small
velocity v in the charmonium rest-frame, one can employ an expansion in v to
study decays of charmonia and results at the leading order for chi_{c0,2} -->
gamma gamma exist in the literature. We study corrections at the
next-to-leading order in the framework of nonrelativistic QCD(NRQCD)
factorization. The study presented here is different than previous approaches
where chi_{c0,2} is taken as a bound-state of a c cbar pair and a
nonrelativistic wave-function is used for the pair. We find that the
corrections are consist not only of relativistic corrections, but also of
corrections from Fock state components of chi_{c0,2} in which the c cbar pair
is in a color-octet state. For chi_{c2} there is also a contribution from a
Fock state component in which the pair is in a F-wave state. We determine the
factorization formula for decay widths in the form of NRQCD matrix elements
representing nonperturbative effects related to chi_{c0,2}, and calculate the
perturbative coefficients at tree-level. Because the NRQCD matrix elements are
unknown, a detailed prediction for the decay chi_{c0,2} --> gamma gamma can not
be made, but the effect of these corrections can be determined at certain
level. Estimations show that the effect is significant and can not be
neglected.


title: Fourth SM Family Manifestations at CLIC

abstract:
  The latest electroweak precision data allow the existence of additional
chiral generations in the standard model. We study prospects of search for the
fourth standard model family fermions and quarkonia at $e^{+}e^{-}$ and $\gamma
\gamma $ options of CLIC. It is shown that CLIC will be powerfull machine for
discovery and investigation of both fourth family leptons and quarkonia.
Moreover, the formation of the fourth family quarkonia will give a new
opportunity to investigate Higgs boson properties.


title: Perturbative evolution at small x

abstract:
  The conventional approach to perturbative evolution is illegal because the
expansion in powers of $\alpha_s$ of the the DGLAP splitting matrix ${\bf
P(z,\alpha_s)}$ breaks down at small $z$. The small-$x$ data for the proton
structure function $F_2(x,Q^2)$ and its charm component $F^c_2(x,Q^2)$ show
that a hard pomeron, with intercept close to 1.4, must be added to the familar
soft pomeron. Conventional perturbative evolution may be applied to the
hard-pomeron component and provides a striking test of perturbative QCD.


title: Brane Worlds and the Cosmic Coincidence Problem

abstract:
  Brane world models with `large' extra dimensions with radii in the r_l ~
0.01- 0.1 mm range and smaller ones at r_s < (1 TeV)^(-1) have the potential to
solve the cosmic coincidence problem, i.e. the apparently fortuitous equality
between dark matter and dark energy components today. The main ingredient is
the assumption of a stabilization mechanism fixing the total volume of the
compact submanifold, but allowing for shape deformations. The latter are
associated with phenomenologically safe ultra-light scalar fields. Bulk fields
Casimir energy naturally plays the role of dark energy, which decreases in time
because of expanding r_l. Stable Kaluza Klein states may play the role of dark
matter with increasing, O(1/r_s), mass. The cosmological equations exhibit
attractor solutions in which the global equation of state is negative, the
ratio between dark energy and dark matter is constant and the observed value of
the ratio is obtained for two large extra dimensions. Experimental searches of
large extra dimensions should take into account that, due to the strong
coupling between dark matter and radii dynamics, the size of the large extra
dimensions inside the galactic halo may be smaller than the average value.


title: Higgs: Standard Model and Beyond

abstract:
  In this talk, I will discuss possible new physics effects that modify the
interaction of Higgs boson(s) with top and bottom quarks, and discuss how to
detect such effects in current and future high energy colliders.


title:
Electromagnetic penguin operators and direct CP violation in K --> pi
  l^+ l^-

abstract:
  Supersymmetric extensions of the Standard Model predict a large enhancement
of the Wilson coefficients of the dimension-five electromagnetic penguin
operators affecting the direct CP violation in K_L --> pi^0 e^+ e^- and the
charge asymmetry in K^\pm --> pi^\pm l^+ l^-.
  Here we compute the relevant matrix elements in the chiral quark model and
compare these with the ones given by lattice calculations


title: Top, Bottom Quarks and Higgs Bosons


title: Lifetime Ratios of Beauty Hadrons at the Next-to-Leading Order in QCD

abstract:
  We compute the next-to-leading order QCD corrections to spectator effects in
the lifetime ratios of beauty hadrons. With respect to previous calculations,
we take into account the non vanishing value of the charm quark mass. We obtain
the predictions tau(B+)/tau(Bd) = 1.06 +- 0.02, tau(Bs)/tau(Bd)= 1.00 +- 0.01
and tau(Lambdab)/tau(Bd) = 0.90 +- 0.05, in good agreement with the
experimental results. In the case of tau(Bs)/tau(Bd) and tau(Lambdab)/tau(Bd),
however, some contributions, which either vanish in the vacuum insertion
approximation or represent a pure NLO corrections, have not been determined
yet.


title:
Determining the Chirality of Yukawa Couplings via Single Charged Higgs
  Boson Production in Polarized Photon Collision

abstract:
  When the charged Higgs boson is too heavy to be produced in pairs, the
predominant production mechanism at Linear Colliders is via the single charged
Higgs boson production processes, such as $e^-e^+ \to b \bar c H^+, \tau \bar
\nu H^+$ and $\gamma\gamma \to b \bar c H^+, \tau \bar \nu H^+$. We show that
the yield of a heavy charged Higgs boson at a $\gamma\gamma$ collider is
typically one or two orders of magnitude larger than that at an $e^-e^+$
collider. Furthermore, a polarized $\gamma\gamma$ collider can determine the
chirality of the Yukawa couplings of fermions with charged Higgs boson via
single charged Higgs boson production, and thus discriminate models of new
physics.


title:
Precision Measurements and Fermion Geography in the Randall-Sundrum
  Model Revisited

abstract:
  We re-examine the implications of allowing fermion fields to propagate in the
five-dimensional bulk of the Randall-Sundrum (RS) localized gravity model. We
find that mixing between the Standard Model top quark and its Kaluza Klein
excitations generates large contributions to the rho parameter and consequently
restricts the fundamental RS scale to lie above 100 TeV. To circumvent this
bound we propose a `mixed' scenario which localizes the third generation
fermions on the TeV brane and allows the lighter generations to propagate in
the full five-dimensional bulk. We show that this construction naturally
reproduces the observed m_c / m_t and m_s / m_b hierarchies. We explore the
signatures of this scenario in precision measurements and future high energy
collider experiments. We find that the region of parameter space that addresses
the hierarchies of fermion Yukawa couplings permits a Higgs boson with a mass
of 500 GeV and remains otherwise invisible at the LHC. However, the entire
parameter region consistent with electroweak precision data is testable at
future linear colliders. We briefly discuss possible constraints on this
scenario arising from flavor changing neutral currents.


title: Hadronic decays of $\bm{\chi_{bJ}}$ into light bottom squarks

abstract:
  We calculate the rates for inclusive hadronic decay of the three $\chi_{bJ}$
states into a pair of light bottom squarks as a function of the masses of the
bottom squark and the gluino. We include color-singlet and color-octet
configurations. The color-octet contribution is found to be insignificant for
the $\chi_{b0}$ but can dominate in the $\chi_{b2}$ case if current lattice
estimates are used for the color-octet matrix element. In comparison with the
standard model values, bottom squark decays can increase the predicted hadronic
width of the $\chi_{b0}$ by as much as 35%, for very small bottom squark masses
and gluino masses in the range of 12 GeV, but make a small contribution in the
cases of $\chi_{b1}$ and $\chi_{b2}$. Data from decays of the $\chi_{bJ}$
states could provide significant new bounds on the existence and masses of
supersymmetric particles.


title: A study of semi-inclusive charmless $B \to \pi X$ decays

abstract:
  We study semi-inclusive charmless decays $B \to \pi X$ in detail, such as
$\bar B^0 \to \pi^{\pm (0)} X$, $B^0 \to \pi^{\pm (0)} X$, $B^{\pm} \to
\pi^{\pm (0)} X$, where $X$ does not contain a charm (anti)quark. We find that
the process $\bar B^0 \to \pi^- X$ ($B^0 \to \pi^+ X$) can be particularly
useful for determination of the CKM matrix element $|V_{ub}|$. We calculate and
present the branching ratio (BR) of $\bar B^0 \to \pi^- X$ as a function of
$|V_{ub}|$, with an estimate of possible uncertainties. It is expected that the
BR is an order of $10^{-4}$. Our estimation indicates that one can
phenomenologically determine $|V_{ub}|$ with reasonable accuracy by measuring
the BR of $\bar B^0 \to \pi^- X$ ($B^0 \to \pi^+ X$).


title: Study of s-channel Charged Higgs Production in CMS

abstract:
  CMS potential for study of the s-channel $H^{\pm}$-boson production via light
quark annihilation is investigated for large values of $\tan\beta$ ($=20\div
50$) and relatively light charge Higgs boson ($M_H = 200 \div 400$ GeV). An
appropriate parameterisation for $M_{\top}(j, \ETM)$-distributions of the
signal and background events is proposed, which provides the determination of
the charged Higgs mass and $\tan\beta$ parameter.


title: Soft Supersymmetry Breaking from Coset Space Dimensional Reduction

abstract:
  The Coset Space Dimensional Reduction scheme is briefly reviewed. Then a
ten-dimensional supersymmetric $E_8$ gauge theory is reduced over symmetric and
non-symmetric six-dimensional coset spaces. In general a four-dimensional
non-supersymmetric gauge theory is obtained in case the used coset space is
symmetric, while a softly broken supersymmetric gauge theory is obtained if the
used coset space is non-symmetric. In the process of exhibiting the above
properties we also present two attractive models, worth exploiting further,
which lead to interesting GUTs with three families in four dimensions.


title: Photonuclear interaction of high energy muons and tau-leptons

abstract:
  General formalism for a two-component description of the inelastic
lepton-nucleon scattering in the diffractive region is proposed.
Nonperturbative contribution to electromagnetic structure functions of a
nucleon is described by the modified generalized vector dominance model
containing special cut-off factors restricting the phase volume of initial
qq-pairs of virtual photon's fluctuations. Perturbative QCD contribution is
described by the phenomenological model suggested (in nonunitarized form) by
Forshaw, Kerley and Shaw.
  Formulae needed for a numerical calculation of photonuclear cross sections
integrated over Q^2 are presented. It is argued that in a case of the
photonuclear cross sections at superhigh energies of leptons (E>=10^6GeV),
integrated over Q^2, the following two-component scheme is good enough: the
nonperturbative contribution is approximated by the old parameterization of
Bezrukov and Bugaev, and perturbative one is described by the model of Forshaw,
Kerley and Shaw with parameters determined from DESY data. Corresponding
results of numerical calculations of the perturbative part, for the cases of
muon and tau-lepton scattering at superhigh energies, are given.


title: Radiative stability of neutrino-mass textures

abstract:
  Neutrino-mass textures proposed at high-scales are known to be unstable
against radiative corrections especially for nearly degenerate eigen values.
Within the renormalization group constraints we find a mechanism in a class of
gauge theories which guarantees reproduction of any high-scale texture at low
energies with radiative stability. We also show how the mechanism explains
solar and atmospheric neutrino anomalies through the bimaximal texture at high
scale.


title:
A Monte Carlo Study on the Dynamical Fluctuations Inside Quark and
  Antiquark Jets

abstract:
  The dynamical fluctuations inside the quark and antiquark jets are studied
using Monte Carlo method. Quark and antiquark jets are identified from the
2-jet events in e+e- collisions at 91.2 GeV by checking them at parton level.
It is found that transition point exists inside both of these two kinds of
jets. At this point the jets are circular in the transverse plane with respect
to the property of dynamical fluctuations. The results are consistent with the
fact that the third jet (gluon jet) was historically first discovered in e+e-
collisions in the energy region 17-30 GeV.


title:
Exact Formula of Probability and CP Violation for Neutrino Oscillations
  in Matter

abstract:
  Within the framework of the standard three neutrino scenario, we derive an
exact and simple formula of the oscillation probability $P(\nu_e \to
\nu_{\mu})$ in constant matter by using a new method. From this formula, it is
found that the matter effects can be separated from the pure CP violation
effects. Furthermore, the oscillation probability can be written in the form,
$P(\nu_e \to \nu_{\mu})=A\cos \delta+B\sin\delta+C$, in the standard
parametrization without any approximation. We also demonstrate that the
approximate formula in high-energy can be easily reproduced from this as an
example.


title:
Electric polarizabilities of proton and neutron and the relativistic
  center-of-mass coordinate

abstract:
  We argue that the relativistic correction $\delta{\bf R}_{c.m.}$ to the
center-of-mass vector can lead to the approximate equality of the proton and
neutron electric polarizabilities in the quark model. The explicit form of
$\delta{\bf R}_{c.m.}$ depends only on the non-relativistic potential between
quarks. In particular, this correction is the same for the potential generated
by Lorentz-vector and -scalar interactions.


title: High Level Tracker Triggers for CMS

abstract:
  Two fast trigger algorithms based on 3 innermost hits in the CMS Inner
Tracker are presented. One of the algorithms will be applied at LHC low
luminosity to select B decay channels. Performance of the algorithm is
demonstrated for the decay channel Bs->Ds+pi. The second algorithm will be used
to select tau-jets at LHC high luminosity.


title:
XML-Based Formulation of Field Theoretical Models. A Proposal for a
  Future Standard and Data Base for Model Storage, Exchange and Cross-checking
  of Results

abstract:
  We propose an XML-based standard for formulation of field theoretical models.
The goal of creation of such a standard is to provide a way for an unambiguous
exchange and cross-checking of results of computer calculations in high energy
physics. At the moment, the suggested standard implies that models under
consideration are of the SM or MSSM type (i.e., they are just SM or MSSM, their
submodels, smooth modifications or straightforward generalizations).


title:
Perturbative logarithms and power corrections in QCD hadronic functions.
  A unifying approach

abstract:
  I present a unifying scheme for hadronic functions that comprises logarithmic
corrections due to gluon emission in perturbative QCD, as well as power-behaved
corrections of nonperturbative origin. The latter are derived by demanding that
perturbatively resummed partonic observables should be analytic in the whole
$Q^2$-plane if they are to be related to physical observables measured in
experiments. I also show phenomenological consequences of this approach. The
focus is on the electromagnetic pion form factor to illustrate both effects,
Sudakov logarithms and power corrections in leading order of
$\Lambda_{\rm{QCD}}^2/Q^2$. The same approach applied to the inclusive
Drell-Yan cross section enables us to perform an absolutely normalized
calculation of the leading power correction in $b^2\Lambda_{\rm{QCD}}^2$ (b
being the impact parameter), which after exponentiation, gives rise to a
nonperturbative Sudakov-type contribution that provides enhancement rather than
suppression, hence partly counteracting the perturbative Sudakov suppression.


title: Relativistic five-quark equations and hybrid baryon spectroscopy

abstract:
  The relativistic five-quark equations are found in the framework of the
dispersion relation technique. The behavior of the low-energy five-particle
amplitude is determined by its leading singularities in the pair invariant
masses. The solutions of these equations using the method based on the
extraction leading singularities of the amplitudes are obtained. The mass
spectra of nucleon and delta-isobar hybrid baryons are calculated. The
calculations of hybrid baryon amplitudes estimate the contributions of four
subamplitudes. The main contributions to the hybrid baryon amplitude are
determined by the subamplitudes, which include the excited gluon states.


title: Polarized Gluon Distribution Function from $\eta'$ Production

abstract:
  Using the recently proposed $gg\eta'$ effective vertex, we investigate the
production of $\eta'$ from gluon fusion in polarized pp collisions. We show
that by measuring $A_{LL}$ in $\eta'$ production, one can extract the polarized
gluon distribution $\Delta G(x,Q^2)$ at $Q^2 \sim 1 \GeV^2$ and in a wide range
of x.


title:
On lattice extraction of K --> pi pi amplitudes to O(p^4) in Chiral
  Perturbation Theory

abstract:
  We show that lattice calculation of K --> pi pi and $epe$ amplitudes for
(8,1) and (27,1) operators to O(p^4) in chiral perturbation theory is feasible
when one uses K --> pi pi computations at the two unphysical kinematics allowed
by the Maiani-Testa theorem, along with the usual (computable) two and three
point functions, namely K --> 0, K --> pi (with momentum) and K - bar{K}.
Explicit expressions for the finite logarithms emerging from our O(p^4)
analysis to the above amplitudes are also given.


title: Clifford algebra implying three fermion generations revisited

abstract:
  The author's idea of {\it algebraic compositeness} of fundamental particles,
allowing to understand the existence in Nature of three fermion generations, is
revisited. It is based on two postulates. i) For all fundamental particles of
matter the Dirac square-root procedure $\sqrt{p^2}\to\Gamma^{(N)}\cdot p$
works, leading to a sequence $N=1,2,3,...$ of Dirac-type equations, where four
Dirac-type matrices $\Gamma^{(N)}_\mu$ are embedded into a Clifford algebra
{\it via} a Jacobi definition introducing four "centre-of-mass" and
$(N-1)\times$four "relative" Dirac-type matrices. These define one
"centre-of-mass" and $N-1$ "relative" Dirac bispinor indices. ii) The
"centre-of-mass" Dirac bispinor index is coupled to the Standard Model gauge
fields, while $N-1$ "relative" Dirac bispinor indices are all free
undistinguishable physical objects obeying Fermi statistics with the Pauli
principle which requires the full antisymmetry with respect to "relative"
indices. This allows only for {\it three} $N = 1,3,5$ in the case of $N$ odd,
implying the existence of {\it three and only three} generations of fundamental
fermions.


title: Slepton and Neutralino/Chargino Coannihilations in MSSM

abstract:
  Within the low-energy effective Minimal Supersymmetric extension of Standard
Model (effMSSM) we calculated the neutralino relic density taking into account
slepton-neutralino and neutralino-chargino/neutralino coannihilation channels.
We performed comparative study of these channels and obtained that both of them
give sizable contributions to the reduction of the relic density. Due to these
coannihilation processes some models (mostly with large neutralino masses)
enter into the cosmologically interesting region for relic density, but other
models leave this region. Nevertheless, in general, the predictions for direct
and indirect dark matter detection rates are not strongly affected by these
coannihilation channels in the effMSSM.


title: Implications of texture 4 zero lepton mass matrices for U_{e3}

abstract:
  Lepton mass matrices similar to texture 4 zero quark mass matrices, known to
be quite successful in explaining the CKM phenomenology, have been considered
for finding the mixing matrix element U_{e3} (\equiv s_{13}) respecting the
CHOOZ constraint, with s_{12} and \Delta m_{12}^2 constrained by SNP and s_{23}
and \Delta m_{23}^2 constrained by ANP. Taking charged lepton mass matrix M_l
to be diagonal, we find that the ranges of s_{13} corresponding to different
SNP solutions very well include the corresponding values of s_{13} found by
Akhmedov et al. by considering neutrino mass matrix M_{\nu} with no texture
zeros. Considering M_l and M_{\nu} both to be real and non-diagonal, s_{13}
ranges for the four SNP solutions come out to be: \sim 0-0.19 (LMA),
0.038-0.093 (SMA), 0.042-0.095 (LOW), 0.038-0.096 (VO) which remain of the same
order when M_l and M_{\nu} are considered to be complex and non-diagonal.


title:
Detailed calculation of lepton flavor violating muon-electron conversion
  rate for various nuclei

abstract:
  The coherent muon-electron conversion rates in various nuclei are calculated
for general lepton flavor violating interactions. We solve the Dirac equations
numerically for the initial state muon and the final state electron in the
Coulomb force, and perform the overlap integrals between the wave functions and
the nucleon densities. The results indicate that the conversion branching ratio
increases for a light nucleus up to the atomic number Z ~ 30, is largest for Z
= 30 -- 60, and becomes smaller for a heavy nucleus with Z > (~ 60). We also
discuss the uncertainty from the input proton and neutron densities. The atomic
number dependence of the conversion ratio calculated here is useful to
distinguish theoretical models with lepton flavor violation.


title:
Time-reversal violating rotation of polarization plane of light in gas
  placed in electric field

abstract:
  Rotation of polarization plane of light in gas placed in electric field is
considered. Different factors causing this phenomenon are investigated. Angle
of polarization plane rotation for transition 6S_{1/2} - 7S_{1/2} in cesium
(lambda=539 nm) is estimated. The possibility to observe this effect
experimentally is discussed.


title: Fast evolution of parton distributions

abstract:
  I report on a numerical program for the evolution of parton distributions.
The program uses the Mellin-transform method with an optimized contour. Due to
this optimized contour the program needs only a few evaluations of the
integrand and is therefore extremely fast. In addition, the program can also be
used to reproduce the results of the x-space method.


title:
Radiatively Induced Neutrino Mass Matrix in a SUSY GUT Model with
  R-Parity Violation

abstract:
  In order to evade the proton decay which appears when the Zee model is
embedded into a SUSY GUT scenario with R-parity violation, a new idea based on
a discrete Z_2 symmetry is proposed. Under the symmetry Z_2, the quark and
lepton mass matrices are tightly constrained. The admissible form of the
radiatively-induced neutrino mass matrix is investigated.


title: Supersymmetry for Alp Hikers

abstract:
  These lectures provide a phenomenological introduction to supersymmetry,
concentrating on the minimal supersymmetric extension of the Standard Model
(MSSM). In the first lecture, motivations are provided for thinking that
supersymmetry might appear at the TeV scale, including the naturalness of the
mass hierarchy, gauge unification and the probable mass of the Higgs boson. In
the second lecture, simple globally supersymmetric field theories are
introduced, with the emphasis on features important for model-building.
Supersymmetry breaking and local supersymmetry (supergravity) are introduced in
the third lecture, and the structure of sparticle mass matrices and mixing are
reviewed. Finally, the available experimental and cosmological constraints on
MSSM parameters are discussed and combined in the fourth lecture, and the
prospects for discovering supersymmetry in future experiments are previewed.


title: On Relevance Of Matrix Coordinates For The Inside Of Baryons

abstract:
  It is argued that one natural choice for coordinates of constituents of a
baryonic state in a SU(N) gauge theory are N x N hermitian matrices. It is
discussed that the relevance of matrix coordinates is supported at least by the
restricted form of the color symmetry. Based on the previous investigations in
this direction, the consequences of the idea are shortly reviewed. The model
has been considered is originated by the D0-branes of String Theory.


title:
About the Simultaneous Co-Existence of Instantaneous and Retarded
  Interactions in Classical Electrodynamics

abstract:
  In this paper it is proved that, contrary to the results found by A.E.
Chubykalo and S.J. Vlaev (Int. J. Mod. Phys. A 14, 3789 (1999)), the retarded
electric and magnetic fields for an uniformly accelerated charge exactly
satisfy Maxwell equations (ME). Furthermore it is shown that ME are correctly
written in the usual form with the partial derivatives and thus not, as
proposed by Chubykalo and Vlaev, with the total derivatives.


title: Bilarge leptonic mixing from Abelian horizontal symmetries

abstract:
  We construct and present a model for leptonic mixing based on
higher-dimensional operators, using the Froggatt-Nielsen mechanism, and Abelian
horizontal symmetries (flavor symmetries) of continuous and discrete type. Our
model naturally yields bilarge leptonic mixing, coming from both the charged
leptons and the neutrinos, and an inverted neutrino mass hierarchy spectrum.
The obtained values of the parameters, i.e., the leptonic mixing parameters and
the neutrino mass squared differences, are all consistent with the atmospheric
neutrino data and the Mikheyev-Smirnov-Wolfenstein large mixing angle solution
for the solar neutrino problem.


title: Production of massive stable particles in inflaton decay

abstract:
  We point out that inflaton decays can be a copious source of stable or
long--lived particles $\chi$ with mass exceeding the reheat temperature $T_R$.
Once higher order processes are included, this statement is true for any $\chi$
particle with renormalizable (gauge or Yukawa) interactions. This contribution
to the $\chi$ density often exceeds the contribution from thermal $\chi$
production, leading to significantly stronger constraints on model parameters
than those resulting from thermal $\chi$ production alone. For example, we all
but exclude models containing stable charged particles with mass less than half
the mass of the inflaton.


title: Instantons and $<A^2>$ Condensate

abstract:
  We argue that the $<A_{\rm OPE}^2>$ condensate found in the Landau gauge on
lattices, when an Operator Product Expansion of Green functions is performed,
might be explained by instantons. We use cooling to estimate the instanton
contribution and extrapolate back the result to the thermalised configuration.
The resulting $<A_{\rm inst}^2>$ is similar to $<A_{\rm OPE}^2>$.


title:
Photonic and QCD radiative corrections to Higgs-boson production in mu+
  mu- --> f fbar

abstract:
  The photonic and QCD radiative corrections at next-to-leading order are
calculated for fermion-pair production at muon colliders, maintaining the full
mass dependence and helicity information of the muons and the produced
fermions. Higher-order effects of initial-state radiation are included at the
leading logarithmic level. In the calculation particular attention is paid to
the issue of gauge invariance in the vicinity of resonances. The most important
corrections are presented in analytical form. The detailed numerical discussion
concentrates on the corrections to the (s-channel) Higgs-boson resonances in
the Standard Model and its minimal supersymmetric extension. The results show
that photonic initial- and QCD final-state corrections are very important in a
precision study of Higgs resonances, but that (photonic) initial-final
interferences are widely suppressed and only modify the non-resonant
background.


title: ATLAS discovery potential for a heavy charged Higgs boson

abstract:
  The sensitivity of the ATLAS detector to the discovery of a heavy charged
Higgs boson is presented. Assuming a heavy SUSY spectrum, the most promising
channels above the top quark mass are $H^\pm\to tb$ and
$H^\pm\to\tau^\pm\nu_\tau$ which provide coverage in the low and high
$\tan\beta$ regions up to $\sim 600$ GeV. The achievable precisions on the
charged Higgs mass and $\tan\beta$ determination are also discussed. The
$H^\pm\to W^\pm h^0$ channel, though restricted to a small MSSM parameter
space, shows a viable signal in NMSSM where the parameter space is less
constrained. The observation of the channel $H^-\to\tau^-_L\nu_\tau + c.c.$ may
constitute a distinctive evidence for models with singlet neutrinos in large
extra dimensions.


title: Physics with tagged forward protons at the LHC

abstract:
  We emphasize the importance of tagging the outgoing forward protons to
sharpen the predictions for New Physics at the LHC (such as the diffractive
production of a light Higgs boson). The rescattering effects lead to a rich
distinctive structure of the cross section as a function of the transverse
momenta of the protons. We show that a study of the correlations between the
proton transverse momenta for double-diffractive production of central dijets
will provide a detailed check of the whole diffractive formalism. Adopting a
perturbative two-gluon structure of the Pomeron, we emphasize that 2++
quarkonium production, via Pomeron-Pomeron fusion, is strongly suppressed. This
offers a favourable production mechanism for non-qqbar states, such as
glueballs.


title: Higgs couplings at the LHC

abstract:
  The observation of a SM-like Higgs boson in multiple channels at the LHC
allows the extraction of Higgs couplings to gauge bosons and fermions. The
precision achievable at the LHC, for an integrated luminosity of 200 fb^{-1},
is reviewed and updated.


title:
Circumstantial Evidence for Rotating Mass Matrix from Fermion Mass and
  Mixing Data

abstract:
  It is shown that existing data on the mixing between up and down fermion
states and on the hierarchical mass ratios between fermion generations, as far
as can be so analysed at present, are all consistent with the two phenomena
being both consequences of a mass matrix rotating in generation space with
changing energy scale. As a result, the rotating mass matrix can be traced over
some 14 orders of magnitude in energy from the mass scale of the $t$-quark at
175 GeV to below that of the atmospheric neutrino at 0.05 eV.


title: Hadronic corrections to the muon decay

abstract:
  We consider the O(alpha^2) hadronic corrections to the energy spectrum of the
decay electron in muon decay. We find that the correction can be described,
within good approximation, by a linear function in the electron energy.
Explicit expressions for the form factors needed in an approach based on
dispersion integrals are given.


title: Orbifold Breaking of Left-Right Gauge Symmetry

abstract:
  We study the five dimensional left-right symmetric gauge theory in which the
gauge symmetry is broken down through orbifold compactification to four
dimensions. The right handed charged gauge boson, W_R is a Kaluza-Klein excited
state in this model, and unlike the usual left-right symmetric model in four
dimension, there is no mixing in the charged sector. We develop the formalism
and give expressions for the gauge boson masses and mixings and their couplings
to the fermions. Phenomenology of the model is briefly studied to put
constraints on the right-handed gauge boson masses and the orbifold
compactification scale.


title:
(Quasi)elastic electron--muon large-angle scattering to a two-loop
  approximation: vertex contributions

abstract:
  We consider a process of quasielastic $e\mu$ large-angle scattering at high
energies with radiative corrections up to a two-loop level. A lowest order
radiative correction arising both from one-loop virtual photon emission and a
real soft emission are presented to a power accuracy. Two-loop level
corrections are supposed to be of three gauge-invariant classes. One of them,
so called vertex contribution, is given in logarithmic approximation. Relation
with the renormalization group approach is discussed.


title: Hybrid adiabatic potentials in the QCD string model

abstract:
  The short- and intermediate-distance behaviour of the hybrid adiabatic
potentials is calculated in the framework of the QCD string model. The
calculations are performed with the inclusion of Coulomb force. Spin-dependent
force and the so-called string correction term are treated as perturbation at
the leading potential-type regime. Reasonably good agreement with lattice
measurements takes place for adiabatic curves excited with magnetic components
of field strength correlators.


title:
Process pi p -> pi pi N at high energies and moderate momenta
  transferred to the nucleon and the determination of parameters of the
  f_0(980) and f_0(1300)

abstract:
  We present the results of simultaneous analysis of the S-wave pi pi-spectra
in the reactions pi^- p -> (pi^0 pi^0)_S n at p_{lab}=38 GeV/c (GAMS) and pi^-
p -> (pi^+ pi^-)_S n at p_{lab}=18 GeV/c (E852 Collaboration) at moderate
momenta transferred to the nucleon, |t| < 1.5 (GeV/c)^2. The t-distributions
are described by the reggeized pi- and a_1-exchanges provided by the leading
and daughter trajectories, while the M_{pi pi}-spectra are determined by a set
of scalar-isoscalar resonances. With M_{pi pi}-distributions averaged over
t-intervals, we have found several solutions given by different t-channel
exchange mechanisms at |t| ~ (0.5-1.5) (GeV/c)^2, with resonance parameters
close to each other. We conclude that despite a poor knowledge of the structure
of the t-exchange, the characteristics of resonances such as masses and widths
can be reliably determined using the processes under discussion. As to pole
positions, we have found (1031 +/- 10) - i(35 +/- 6) MeV for f_0(980) and (1315
+/- 20) - i(150 +/- 30) MeV for f_0(1300).


title: Secondary Reggeons in Perturbative QCD

abstract:
  Using the Kirschner-Lipatov equation as a basis, we study high energy elastic
quark-quark amplitudes, which correspond to secondary Reggeons and pion
exchange in the double-logarithmic approximation of perturbative QCD.


title: Yukawa Quasi-Unification

abstract:
  We construct concrete supersymmetric grand unified theories based on the
Pati-Salam gauge group SU(4)_c x SU(2)_L x SU(2)_R which naturally lead to a
moderate violation of "asymptotic" Yukawa unification and thus can allow an
acceptable b-quark mass even with universal boundary conditions. We consider
the constrained minimal supersymmetric standard model which emerges from one of
these theories with a deviation from Yukawa unification which is adequate for
mu>0. We show that this model possesses a wide and natural range of parameters
which is consistent with the data on b --> s gamma, the muon anomalous magnetic
moment, the cold dark matter abundance in the universe, and the Higgs boson
masses. The lightest supersymmetric particle can be as light as about 107 GeV.


title: Mass of the higgs versus fourth generation masses

abstract:
  The predicted value of the higgs mass $m_H$ is analyzed assuming the
existence of the fourth generation of leptons ($N, E$) and quarks ($U, D$).
  The steep and flat directions are found in the five-dimensional parameter
space: $m_H$, $m_U$, $m_D$, $m_N$, $m_E$. The LEPTOP fit of the precision
electroweak data is compatible (in particular) with $m_H \sim 300$ GeV, $m_N
\sim 50$ GeV, $m_E \sim 100$ GeV, $m_U +m_D \sim 500$ GeV, and $|m_U -m_D| \sim
75$ GeV. The quality of fits drastically improves when the data on b- and
c-quark asymmetries and new NuTeV data on deep inelastic scattering are
ignored.


title: Goldstone excitations from spinodal instability

abstract:
  The squared mass of a complex scalar field is turned dynamically into
negative by its O(2)-invariant coupling to a real field slowly rolling down in
a quadratic potential. The emergence of gapless excitations is studied in real
time simulations after spinodal instability occurs. Careful tests demonstrate
that the Goldstone modes appear almost instantly after the symmetry breaking is
over, much before thermal equilibrium is established.


title:
Finite Temperature Pion Scattering to one-loop in Chiral Perturbation
  Theory

abstract:
  We present the pion-pion elastic scattering amplitude at finite temperature
to one-loop in Chiral Perturbation Theory. The thermal scattering amplitude
properly defined allows to generalize the perturbative unitarity relation to
the $T\neq 0$ case. Our result provides a model independent prediction of an
enhanced pion-pion low-energy phase shift with the temperature and it has
physical applications within the context of Relativistic Heavy Ion Collisions.


title: Completing the NLO QCD calculation of B -> Xs gamma

abstract:
  We evaluate two-loop b -> s gamma matrix elements of all the four-quark
operators containing no derivatives. Contrary to previous calculations, no
expansion in the mass ratio mc/mb is performed, and all the possible Dirac and
flavor structures are included. Consequently, we are able to provide the last
item in the NLO analysis of B -> Xs gamma that has been missing so far, namely
the two-loop matrix elements of the QCD-penguin operators. Due to smallness of
the Wilson coefficients of those operators in the Standard Model, their effect
on the branching ratio is small: a reduction by roughly 1%. We find BR[ B -> Xs
gamma]_{E_gamma > 1.6 GeV} = (3.57 +_ 0.30)*10^{-4}.


title:
Transition form factors and light-cone distribution amplitudes of
  pseudoscalar mesons in the chiral quark model

abstract:
  It is shown that a chiral quark model of the Nambu--Jona-Lasinio type can be
used to describe "soft"-momenta parts of the amplitudes with large momentum
transfer. As a sample, the processes \gamma^* --> \gamma (\pi,\eta,\eta') where
one of the photons, \gamma^*, has large space-like virtuality is investigated.
The \gamma^* --> \gamma (\pi,\eta,\eta')$ transition form factors are
calculated for a wide region of transferred momenta. The results are consistent
with the calculations performed in the instanton-induced chiral quark model and
agree with experimental data. The distribution amplitudes of pseudoscalar
mesons are derived.


title: Geometric Scaling above the Saturation Scale

abstract:
  We show that the evolution equations in QCD predict geometric scaling for
quark and gluon distribution functions in a large kinematical window, which
extends above the saturation scale up to momenta $Q^2$ of order $100 {\rm
GeV}^2$. For $Q^2 < Q^2_s$, with $Q_s$ the saturation momentum, this is the
scaling predicted by the Colour Glass Condensate and by phenomenological
saturation models. For $1 \simle \ln(Q^2/Q_s^2) \ll \ln(Q_s^2/\Lambda^2_{\rm
QCD})$, we show that the solution to the BFKL equation shows approximate
scaling, with the scale set by $Q_s$. At larger $Q^2$, this solution does not
scale any longer. We argue that for the intermediate values of $Q^2$ where we
find scaling, the BFKL rather than the double logarithmic approximation to the
DGLAP equation properly describes the dynamics. We consider both fixed and
running couplings, with the scale for running set by the saturation momentum.
The anomalous dimension which characterizes the approach of the gluon
distribution function towards saturation is found to be close to, but lower
than, one half.


title:
Addendum to: Model-dependent and -independent implications of the first
  Sudbury Neutrino Observatory results

abstract:
  In the light of recent experimental and theoretical improvements, we review
our previous model-independent comparison [hep-ph/0106247] of the
Super-Kamiokande (SK) and Sudbury Neutrino Observatory (SNO) solar neutrino
event rates, including updated values for the ``equalized'' SK datum and for
the reference Standard Solar Model (SSM) B neutrino flux. We find that the
joint SK+SNO evidence for active neutrino flavor transitions is confirmed at
the level of 3.3 standard deviations, independently of possible transitions to
sterile states. Barring sterile neutrinos, we estimate the 3-sigma range for
the $^8$B neutrino flux (normalized to SSM) as f_B=0.96 +0.54-0.55.
Accordingly, the 3-sigma range for the energy-averaged nu_e survival
probability is found to be <P_ee> = 0.31 +0.55-0.16, independently of the
functional form of P_ee. An increase of the reference nu_e + d --> p + p + e
cross section by ~3%, as suggested by recent theoretical calculations, would
slightly shift the central values of f_B and of <P_ee> to ~1.00 and ~0.29,
respectively, and would strengthen the model-independent evidence for nu_e
transitions into active states at the level of ~3.6 sigma.


title: Spin calculations in arbitrary and diagonal spin bases

abstract: We consider the spin calculations in arbitrary and diagonal spin bases


title:
Heavy top limit and double-logarithmic contributions to Higgs production
  at m_H^2 / s << 1

abstract:
  Next-to-next-to-leading order (NNLO) QCD corrections to Higgs boson
hadroproduction have recently been calculated in the heavy top-quark limit m_t
-> \infty. The m_t -> \infty limit introduces double-logarithmic corrections in
ln x, with x = m_H^2 / s. We identify these corrections order by order in
alpha_s. As an application, we derive an analytic expression for the dominant x
<< 1 part of the NNLO coefficient.


title: Diffraction in QCD

abstract:
  Results on soft and hard diffraction are briefly reviewed and placed in a QCD
perspective using a parton model approach. Issues addressed include
factorization, scaling properties, universality of rapidity gap formation, and
unitarity. Predictions for differential cross sections of processes with
multiple rapidity gaps are presented with examples for the Tevatron and the
Large Hadron Collider. This paper is an expanded version of a paper delivered
at SNOWMASS-2001 (arXiv:hep-ph/0110240).


title:
Entropy Production during Reheating at Late Times and Neutrino
  Decoupling

abstract:
  Small Recent theories have proposed a variety of massive particles, like the
moduli, whose abundance or decay endangers standard cosmological results. To
dilute them, thermal inflation has been proposed, with its own massive scalar
flaton field which goes on decaying in the era of Mev-scale temperatures. In
this paper, the effect of late-time entropy production on neutrino decoupling
during such reheating is investigated by including a term, arising from the
rate of entropy production due to scalar decay, in the Boltzmann equation for
the neutrino number density. The effect on the decoupling temperature of
massless neutrinos is studied. It is found that a lower bound to the scalar
decay rate constant can be set at 10^{-22} Gev.


title: Evaluation of a Class of Two-Scale Three-Loop Vacuum Diagrams

abstract:
  As a generalization of a previous work [Phys. Rev. D. {\bf 59}, 105014
(1999)], we compute analytically a class of three-loop vacuum diagrams with two
{\em arbitrarily} different mass scales. We use a decomposition algorithm in
which the integrand of the final integral for the third momentum vector, say,
$k$, becomes independent of the angles of $k$-vector in spherical polar
coordinates. This algorithm proves to be very efficient in obtaining
exclusively all $\e$-pole terms of the given diagram.


title:
A method for analysing the jet azimuthal anisotropy in ultrarelativistic
  heavy ion collisions

abstract:
  The azimuthal anisotropy of jet spectra due to energy loss of jet partons in
azimuthally non-symmetric volume of dense quark-gluon matter is considered for
semi-central nuclear interactions at collider energies. We develop the
techniques for event-by-event analysing the jet azimuthal anisotropy using
particle and energy elliptic flow, and suggest a method for calculation of
coefficient of jet azimuthal anisotropy without reconstruction of nuclear
reaction plane.


title: U(12) A New Symmetry Possibly Realizing in Hadron Spectroscopy

abstract:
  Starting from the multi-local Klein-Gordon equations with Lorentz-scalar
squared-mass operator we give a covariant quark representation of the general
composite mesons and baryons with definite Lorentz transformation property. The
phenomenologically observed hadron mass spectra is pointed out to satisfy
possibly the approximate symmetry under the tilde U(4) transformation group
concerning the spinor freedom of light constituent quarks, including the chiral
transformation as a subgroup. This symmetry predicts the existence of new type
of chiral mesons and baryons out of the conventional framework in
non-relativistic quark model: For light q qbar systems, the scalar sigma- and
axial-vector a1-nonets are predicted to exist as relativistic S-wave states
besides the ordinary P-wave state mesons. Two "exotic" JPC=1-+ mesons are
predicted to exist as relativistic P-wave states, which are possibly assigned
as pi1(1400) and pi1(1600). For light quark baryons the extra 56 with positive
parity and the extra 70 with negative parity of the static SU(6) are predicted
to exist as the ground state chiral particles.


title: Could there be a Fourth Generation?

abstract:
  We investigate the possibility of incorporating a chiral fourth generation
into a GUT model. We find that in order to do so, precision fits to electroweak
observables demand the introduction of light (< M_Z) supersymmetric particles.
This also enables us to provide decay channels to the fourth-generation quarks.
Perturbative consistency sets an upper bound on the coloured supersymmetric
spectrum. The upper limit on the lightest Higgs boson is calculated and found
to be above the present experimental lower limit.


title: Family replicated fit of all quark and lepton masses and mixings

abstract:
  We review our recent development of family replicated gauge group model,
which generates the Large Mixing Angle MSW solution. The model is based on each
family of quarks and leptons having its own set of gauge fields, each
containing a replica of the Standard Model gauge fields plus a (B-L)-coupled
gauge field. A fit of all the seventeen quark-lepton mass and mixing angle
observables, using just six new Higgs field vacuum expectation values, agrees
with the experimental data order of magnitudewise. However, this model can not
predict the baryogenesis in right order, therefore, we discuss further
modification of our model and present a preliminary result of baryon number to
entropy ratio.


title:
What is the W b anti-b, Z b anti-b or t anti-t b anti-b irreducible
  background to the light Higgs boson searches at LHC?

abstract:
  The W b anti-b, Z b anti-b and t anti-t b anti-b production at LHC are
irreducible backgrounds for possible observability of the Standard Model (SM)
and Minimal Supersymmetric Standard Model (MSSM) light Higgs boson respectively
in the associated WH, ZH and t anti-t H production followed by the H -> b
anti-b decay. We present a comparison of the background estimates as obtained
with (a) complete massive matrix element implemented in AcerMC Monte Carlo
generator and (b) PYTHIA implementation of the inclusive W, Z, and t anti-t
production, followed by the parton showering mechanism. Both approaches lead to
a production of the final state of interest, but differ in the approximations
used. We concentrate on the comparison of these approaches for the background
to the light Higgs boson searches at LHC.


title: Dynamical Generation of Scalar Mesons

abstract:
  Starting with just one bare seed for each member of a scalar nonet, we
investigate when it is possible to generate more than one hadronic state for
each set of quantum numbers. In the framework of a simple model, we find that
in the I=1 sector it is possible to generate two physical states with the right
features to be identified with the a_0(980) and the a_0(1450). In the I=1/2
sector, we can generate a number of physical states with masses higher than 1
GeV, including one with the right features to be associated with the
K_0^*(1470), but none which can be identified with the light kappa scalar
meson. The I=0 sector is the most complicated and elusive: since all outcomes
are very strongly model dependent, we cannot draw any robust conclusion.
Nevertheless, we find that in that case too, depending on the coupling scheme
adopted, the occurrence of numerous states can be achieved. This shows that
dynamical generation of physical states is a possible solution to the problem
of accounting for more scalar mesons than can fit in a single nonet, as
experiments clearly deliver.


title: Azimuthal correlation in DIS

abstract:
  We introduce the azimuthal correlation for the deep inelastic scattering
process. We present the QCD prediction to the level of next-to-leading log
resummation, matching to the fixed order prediction. We also estimate the
leading non-perturbative power correction. The observable is compared with the
energy-energy correlation in e+e- annihilation, on which it is modelled. The
effects of the resummation and of the leading power correction are both quite
large. It would therefore be particularly instructive to study this observable
experimentally.


title: Systematics of Heavy Quark Production at RHIC

abstract:
  We discuss a program for systematic studies of heavy quark production in
$pp$, $pA$ and $AA$ interactions. The $Q \bar Q$ production cross sections
themselves cannot be accurately predicted to better than 50% at RHIC. For
studies of deviations in $Q \bar Q$ production such as those by nuclear
shadowing and heavy quark energy loss, the $pp$ cross section thus needs to be
measured. We then show that the ratio of $pA$ to $pp$ dilepton mass
distributions can provide a measurement of the nuclear gluon distribution. With
total rates and nuclear shadowing under control it is easier to study energy
loss and to use $c \bar c$ as a normalization of $J/\psi$ production.


title: Direct CP Violation in Untagged B-Meson Decays

abstract:
  Direct CP violation can exist in untagged, neutral B-meson decays to certain
self-conjugate, hadronic final states. It can occur if the resonances which
appear therein permit the identification of distinct, CP-conjugate states -- in
analogy to stereochemistry, we term such states ``CP-enantiomers.'' These
states permit the construction of a CP-odd amplitude combination in the
untagged decay rate, which is non-zero if direct CP violation is present. The
decay B\to \pi^+\pi^-\pi^0, containing the distinct CP-conjugate states \rho^+
\pi^- and \rho^- \pi^+, provides one such example of a CP-enantiomeric pair. We
illustrate the possibilities in various multi-particle final states.


title: Structure and texture of the quark mass matrix

abstract:
  Starting from a weak basis in which the up (or down) quark matrix is
diagonal, we obtain an exact set of equations for the quark mass matrix
elements in terms of known observables. We make a numerical analysis of the
down (up) quark mass matrix. Using the data available for the quark masses and
mixing angles at different energy scales, we found a numerical expression for
these matrices. We suggest that it is not possible to have an specific texture
from this analysis. We also examine the most general case when the complex
phases are introduced in the mass matrix. We find the numerical value for these
phases as a function of $\delta$, the CP-violationg phase.


title: Quantum Production of Black Holes

abstract:
  We give a path integral expression for the quantum amplitude to produce a
black hole from particle collisions. When expanded about an appropriate
classical solution it yields the leading order contribution to the production
amplitude in a curvature expansion. Classical solutions describing black hole
production resulting from two particle scattering at non-zero impact parameter,
combined with our formalism, indicate a geometric cross section for the quantum
process. In TeV gravity scenarios these solutions may exhibit large curvatures,
but (modulo a mild assumption about quantum gravity) corrections to the
semi-classical cross section are small.


title: QCD Analysis of Polarized Deep Inelastic Data and Parton Distributions

abstract:
  A QCD analysis of the world data on polarized deep inelastic scattering is
presented in leading and next-to-leading order. New parameterizations are
derived for the quark and gluon distributions for the kinematic range $x
\epsilon [10^{-9},1], Q^2 \epsilon [1,10^6] \GeV^2$. The extrapolation far
outside the domain of the current measurements is given both to allow for
applications at higher values of $Q^2$ and to be able to calculate integral
properties of the present distributions. The values of $\Lambda_{\rm QCD}$ and
$\alpha_s(M_z)$ are determined. Emphasis is put on the derivation of the fully
correlated $1\sigma$ error bands for these distributions, which are also given
in terms of parameterizations and are directly applicable to determine
experimental errors of other polarized observables. The impact of the variation
of both the renormalization and factorization scales on the value of $\alpha_s$
is studied. Finally we perform a factorization--scheme invariant QCD analysis
based on the observables $g_1(x,Q^2)$ and $d g_1(x,Q^2)/d \log(Q^2)$ in
next-to-leading order, which is compared to the standard analysis. A series of
low moments of parton densities, accounting for error correlation, are given to
allow for comparison with results from lattice simulations.


title: The high-energy limit of H+2 jet production via gluon fusion

abstract:
  We consider Higgs + 2 jet production via gluon fusion in the limit where
either one of the Higgs-jet or the dijet invariant masses become much larger
than the typical momentum transfers in the scattering. These limits also occur
naturally in Higgs production via weak-boson fusion. We show that the
scattering amplitudes factorize in the high energy limit, and we obtain the
relevant effective vertices.


title:
Looking from the East at an Elephant Trotting West: Direct CP Violation
  in $B^0$ Decays

abstract:
  With the time dependant CP asymmetry in $B_d(t) \to \psi K_S$ well measured,
the most powerful method to search for {\em direct} CP violation in $B_d$
decays is to analyze whether the CP asymmetry of other transitions like $B_d(t)
\to \pi ^+ \pi ^-, \eta ^{\prime}K_S$ etc. can be described by a $sin$ term
taken from $B_d(t) \to \psi K_S$ and without a cos term. The failure of such a
constrained fit would establish direct CP violation (even if no CP asymmetry
were observed in these other modes).


title: Weak Phase $\gamma$ from $B_s(t) \to K^+ K^-$

abstract:
  We re-examine the time-dependent rates of $\bs(t) \to K^+ K^-$ and $\obs(t)
\to K^+ K^-$, including a lifetime difference between neutral $\bs$ mass
eigenstates. The two rates, normalized by the rate of $\bs \to \ko \ok$, are
used to obtain ambiguity-free information on a strong phase and on the weak
phase $\gamma$. We discuss the sensitivity of extracting $\gamma$ to the
measured quantities, and find that an error of $\pm 10^\circ$ in $\gamma$ is
possible for a sample of several thousand $\bs(t) \to K^+ K^-$ decays. This
study is complementary to a recent similar analysis of the U-spin related
decays $\bo(t) \to \pi^+\pi^-$ and $\ob(t) \to \pi^+\pi^-$.


title:
Complete one-loop corrections to the mass spectrum of charginos and
  neutralinos in the MSSM

abstract:
  The mass spectrum of the chargino--neutralino sector in the minimal
supersymmetric standard model (MSSM) is calculated at the one-loop level, based
on the complete set of one-loop diagrams. On-shell renormalization conditions
are applied to determine the counterterms for the gaugino-mass-parameters $M_1,
M_2$ and the Higgsino-mass parameter $\mu$. The input is fixed in terms of
three pole masses (two charginos and one neutralino); the other pole masses
receive a shift with respect to the tree-level masses, which can amount to
several GeV. The detailed evaluation shows that both the fermionic/sfermionic
loop contributions and the non-(s)fermionic loop contributions are of the same
order of magnitude and are thus relevant for precision studies at future
colliders.


title: Semi-inclusive nonleptonic decays B\to D_s^{(*)} X

abstract:
  We calculate the total and differential decay rates for the semi-inclusive
nonleptonic decays $B\to D_s^{(*)} X_q$ ($q=c$ or $u$) under the factorization
hypothesis. The initial bound state effect is treated using the light-cone
expansion and the heavy quark effective theory. We investigate the contribution
of the penguin amplitude for the decay mode $B\to D_s^{(*)} X_c$ and find that
it is small but non-negligible. The resulting decay rates for $B\to D_s^{(*)}
X_c$ agree with the measurements. The use of the decay mode $B\to D_s^{(*)}
X_u$ to determine $|V_{ub}|$ is discussed.


title:
Power corrections in deep inelastic structure functions at large Bjorken
  x

abstract:
  We study power corrections to the spin-averaged structure functions F_2 and
F_L in the semi-inclusive region. The dramatic breakdown of the operator
product expansion at large Bjorken x due to the formation of a narrow jet with
invariant mass W (W^2=Q^2(1-x)/x) calls for an alternative approach. Our main
conjecture is that the dominant contribution at each twist is the one which
mixes under renormalization with the leading twist (ultraviolet dominance). At
twist two the dominant perturbative corrections at large x due to soft and
collinear radiation can be factorized into a jet function. From the ultraviolet
dominance conjecture it follows that the twist two parton distribution as well
as the jet function actually factorize to any order in the twist expansion.
This factorization suggests that non-perturbative corrections ~1/W^{2n}
exponentiate together with the leading twist. We verify explicitly, at the
level of a single dressed gluon, the cancellation between ambiguities due to
infrared renormalons in the twist-two coefficient functions and those due to
the ultraviolet divergence of twist-four matrix elements. Independently of the
renormalon analysis, we show that the dominant contribution to twist four at
large x is associated with a twist-two like configuration: the final states are
identical to those of twist two, whereas the initial states differ just by
additional partons carrying small momentum fractions. This picture is
consistent with the ultraviolet dominance conjecture.


title: Soft Physics -- Three Pomerons?

abstract:
  A model of a three Pomeron contribution to high energy elastic $pp$ and $\bar
p p$ scattering is proposed. The data are well described for all momenta
($0.01\le |t|\le 14. GeV^2$) and energies ($8.\le\sqrt{s}\le 1800. GeV$)
($\chi^2/{\rm d.o.f.}=2.60$). The model predicts the appearance of two dips in
the differential cross-section which will be measured at LHC. The parameters of
the Pomeron trajectories are: $\alpha(0)_{{\Bbb P}_1}=1.058, \alpha'(0)_{{\Bbb
P}_1}=0.560 (GeV^{-2});$ $\alpha(0)_{{\Bbb P}_2}=1.167, \alpha'(0)_{{\Bbb
P}_2}=0.273 (GeV^{-2});$ $\alpha(0)_{{\Bbb P}_3}=1.203, \alpha'(0)_{{\Bbb
P}_3}=0.094 (GeV^{-2}).$


title:
Five-parton amplitudes with two-quark and two-photon at Next-to-Leading
  Order

abstract:
  We discuss one-loop five-parton amplitudes with two-quark two-photon or
three-photon external legs. The amplitudes are required to evaluate the NLO
corrections for the $\gamma\gamma jet$ production process at hadron colliders.
The results have been already discussed by several groups in terms of QCD
amplitudes. Here, we present more straightforward version of one-loop
calculations without using the QCD amplitudes.


title: Neutrinos and Big Bang Nucleosynthesis

abstract:
  The role of neutrinos in big bang nucleosynthesis is discussed. The bounds on
the number of neutrino families, neutrino degeneracy, parameters of neutrino
oscillations are presented. A model of chemically inhomogeneous, while
energetically smooth, universe created by inhomogeneous cosmological neutrino
asymmetry is described. Nucleosynthesis limits on production of right-handed
neutrinos are considered.


title: Testing Brane World Models with Ultra High Energy Cosmic Rays

abstract:
  The arrival time coherence of particles in the Ultra High Energy Air Showers
where the center of mass energy of the interaction is of the order of $10^{15}
eV$, puts strict constraint on the propagation of particles in a hypothetical
extra-dimension. We first argue that at such high energies bulk modes and
massive KK-modes can be produced abundantly and in many models their phase
space volume is larger than confined modes. Then, we study the minimum
propagation time in one and two-brane models and show that a large part of the
parameter space of these models are ruled out unless the confinement of fields
is proteced by symmetries up to energies not accessible even to the high energy
tail of Ultar High Energy Cosmic Rays (UHECRs). As a by-product we confirm the
result obtained in some previous works about the close relation between a small
Cosmological Constant and the hierarchy problem.


title:
Potential NRQCD and Heavy-Quarkonium Spectrum at
  Next-to-Next-to-Next-to-Leading Order

abstract:
  The next-to-next-to-next-to-leading order (N^3LO) Hamiltonian of potential
nonrelativistic QCD is derived. The complete matching of the Hamiltonian and
the contribution from the ultrasoft dynamical gluons relevant for perturbative
bound-state calculations is performed including one-, two-, and three-loop
contributions. The threshold expansion is used to disentangle and match
contributions of different scales in the effective-theory calculations. As a
physical application, the heavy-quarkonium spectrum is obtained at N^3LO for
the case of vanishing QCD beta function. Our results set the stage for a full
N^3LO analysis of the heavy-quarkonium system.


title:
Novel analysis of chiral loop effects in the generalized
  Gerasimov-Drell-Hearn sum rule

abstract:
  We study the chiral loop corrections to the generalized Gerasimov-Drell-Hearn
sum rule of the nucleon for finite photon virtuality in the framework of a
Lorentz-invariant formulation of baryon chiral perturbation theory. We perform
a complete one-loop calculation and obtain significant differences to
previously found results based on the heavy baryon approach for the proton and
neutron spin-dependent forward Compton amplitudes.


title: Neutrino masses and unification of the gauge and Yukawa couplings

abstract:
  There is a convincing experimental evidence that neutrinos are massive.
Therefore we investigate the influence of the neutrino masses on the
unification of gauge and Yukawa couplings in the framework of the Minimal
Supersymmetric Standard Model. We estimate the contribution of the neutrino
Yukawa coupling to the gauge and Yukawa coupling unification. We find that in
the case of the gauge coupling unification the effect of massive neutrinos is
small and can be neglected. It appears to be much more significant, if we
explore Y_{b} and Y_{tau} equality at the GUT scale. The neutrino contribution
can change that relation even by ~12%.


title:
What can the SNO Neutral Current Rate teach us about the Solar Neutrino
  Anomaly

abstract:
  We investigate how the anticipated neutral current rate from $SNO$ will
sharpen our understanding of the solar neutrino anomaly. Quantitative analyses
are performed with representative values of this rate in the expected range of
$0.8 - 1.2$. This would provide a $5 - 10 \sigma$ signal for $\nu_e$ transition
into a state containing an active neutrino component. Assuming this state to be
purely active one can estimate both the $^8B$ neutrino flux and the $\nu_e$
survival probability to a much higher precision than currently possible.
Finally the measured value of the $NC$ rate will have profound implications for
the mass and mixing parameters of the solar neutrino oscillation solution.


title: Sigma-meson in hot and dense matter

abstract:
  An important role of the scalar isoscalar sigma-meson in the low-energy
physics is discussed. The behavior of the sigma-meson in the hot and dense
medium is studied. It is shown that in the vicinity of critical values of
temperature(T) and chemical potential(m) the sigma-meson can become a sharp
resonance. This effect can lead to a strong enhancement of the processes pi pi
-> gamma gamma and pi pi-> pi pi near the two-pion threshold. Experimental
observation of this phenomenon can be interpreted as a signal of approaching
the domain where the chiral symmetry restoration and phase transition of the
hadron matter into quark-gluon plasma take place.


title:
Status of the B^0_{(s)}-\bar B^0_{(s)}} mixing from QCD spectral sum
  Rules

abstract:
  In this talk, I present new results [1] obtained from QCD spectral sum rules
(QSSR), on the bag constant parameters entering in the analysis of the
B^0_{(s)}-\bar B^0_{(s)} mass-differences. Taking the average of the results
from the Laplace and moment sum rules, one obtains to order \alpha_s:
f_B\sqrt{\hat B_B}= (228 +- 61) MeV, f_{B_s}\sqrt{B_{B_s}}/{f_{B}\sqrt{B_{B}}=
1.18 +- 0.03, in units where f_\pi=130.7 MeV. Combined with the experimental
data on the mass-differences \Delta M_{d,s}, one obtains the constraint on the
CKM weak mixing angle: |V_{ts}/V_{td}|^2 > 20.2(1.3). Alternatively, using the
weak mixing angle from the analysis of the unitarity triangle and the data on
\Delta M_d, one predicts \Delta M_s=18.3(2.1) ps^{-1} in agreement with the
present experimental lower bound and within the reach of Tevatron 2.


title:
Unintegrated gluon distributions from the transverse coordinate
  representation of the CCFM equation in the single loop approximation

abstract:
  We utilise the fact that the CCFM equation in the single loop approximation
can be diagonalised by the Fourier-Bessel transform. The analytic solution of
the CCFM equation for the moments $f_{\omega}(b,Q)$ of the scale dependent
gluon distribution is obtained, where $b$ is the transverse coordinate
conjugate to the transverse momentum of the gluon. The unintegrated gluon
distributions obtained from this solution are analysed. It is shown how the
approximate treatment of the exact solution makes it possible to express the
unintegrated gluon distributions in terms of the integrated ones. The
corresponding approximate expressions for the unintegrated gluon distribution
are compared with exact solution of the CCFM equation in the single loop
approximation.


title: Constraints of the fourth generation from $g_\mu -2$

abstract:
  We investigate the newly observed muon $g_\mu -2$ anomaly in the framework of
a sequential fourth generation model with a heavy fourth neutrino, $\nu'$. We
find that $g_\mu -2$ can exclude most values of $m_{\nu'}$ and put a very
stringent constraint on the existence of the fourth generation. We also obtain
bounds of a $4\times 4$ leptonic mixing matrix elements, $V_{2\nu'}$ if it
really exists.


title: Remarks on CP Asymmetries in $D^0/\bar {D^0} \ra K_S \pi^+ \pi^-$

abstract:
  We consider the interference of resonant amplitudes leading to the final
state $K_S \pi^+ \pi^-$ in $D^0/\bar {D^0}$ decays. Each of these amplitudes
consists of both Cabibbo allowed and doubly Cabibbo suppressed transitions. The
role of strong phase arising out of Breit-Wigner resonant propagators is
emphasised. Invoking the $\Delta S = \Delta Q$ rule, $K_S$ in the final state
is identified as the mass eigenstate of superposed weak eigenstates $K^0$ and
$\bar K^0$. A nonzero CP asymmetry appears to be possible in three body decays.


title:
Asymptotic conditions for electromagnetic form factors of hadrons
  represented by VMD model

abstract:
  A system of linear homogeneous algebraic equations for coupling constant
ratios of vector-mesons to hadrons is derived by imposing an asymptotic
behaviuor upon the VMD pole parametrization of an hadron electromagnetic form
factor. A similar system of equations with a simpler structure of coefficients,
taken as even powers of vector-meson masses, is derived by means of integral
superconvergent sum rules for the imaginary part of the considered from factor
using its appropriate delta function approximation. Although both systems have
been derived starting from different properties of the electromagnetic form
factor and they look each in its own way, it is shown explicitly that they are
fully equivalent.


title: Pair of Heavy-Exotic-Quarks at LHC

abstract:
  We study the production and signatures of heavy exotic quarks pairs at LHC in
the framework of the vector singlet model (VSM), vector doublet model (VDM) and
fermion-mirror-fermion (FMF) model. The pair production cross sections for the
electroweak and strong sector are computed.


title: Transport coefficients, spectral functions and the lattice

abstract:
  Transport coefficients are determined by the slope of spectral functions of
composite operators at zero frequency. We study the spectral function relevant
for the shear viscosity for arbitrary frequencies in weakly-coupled scalar and
nonabelian gauge theories at high temperature and compute the corresponding
correlator in euclidean time. We discuss whether nonperturbative values of
transport coefficients can be extracted from euclidean lattice simulations.


title:
Spontaneous CP Phases and Flavour Changing Neutral Currents in the
  Left-Right Symmetric Model

abstract:
  We study the behaviour of the flavour changing neutral currents in the
Left-Right Symmetric Model related to the presence of spontaneous CP phases. To
do this, we explore four cases corresponding to combinations of maximal and no
CP violation in both the lepton and quark sector. We find that we can constrain
the flavour changing neutral currents to the experimental limit, by adjusting
the CP-violating phase of the quark sector, opening the possibility to obtain a
large CP violation in the lepton sector as well as new Higgs bosons at the
electroweak scale.


title: Experimental identification of non-pointlike dark-matter candidates

abstract:
  We show that direct dark matter detection experiments can distinguish between
pointlike and non-pointlike dark-matter candidates. The shape of the nuclear
recoil energy spectrum from pointlike dark-matter particles, e.g., neutralinos,
is determined by the velocity distribution of dark matter in the galactic halo
and by nuclear form factors. In contrast, typical cross sections of
non-pointlike dark matter, for example, Q-balls, have a new form factor, which
decreases rapidly with the recoil energy. Therefore, a signal from
non-pointlike dark matter is expected to peak near the experimental threshold
and to fall off rapidly at higher energies. Although the width of the signal is
practically independent of the dark matter velocity dispersion, its height is
expected to exhibit an annual modulation due to the changes in the dark matter
flux.


title:
Analytical treatment of neutrino asymmetry equilibration from flavour
  oscillations in the early universe

abstract:
  A recent numerical study by A. D. Dolgov, S. H. Hansen, S. Pastor, S. T.
Petcov, G. G. Raffelt, and D. V. Semikoz (DHPPRS) [hep-ph/0201287] found that
complete or partial equilibrium between all active neutrino flavours can be
achieved before the big bang nucleosynthesis epoch via flavour oscillations, if
the oscillation parameters are those inferred from the atmospheric and solar
neutrino data, and, in some cases, if $\theta_{13}$ is also sizeable. As such,
cosmological constraints on the electron neutrino-antineutrino asymmetry are
now applicable in all three neutrino sectors. In the present work, we provide
an analytical treatment of the scenarios considered in DHPPRS, and demonstrate
that their results are stable even for very large initial asymmetries. The
equilibration mechanism can be understood in terms of an MSW-like effect for a
maximally mixed and effectively monochromatic system. We also comment on
DHPPRS's choices of mixing parameters, and their handling of collisional
effects, both of which could impinge on the extent of flavour equilibrium.


title:
Constraints on decay plus oscillation solutions of the solar neutrino
  problem

abstract:
  We examine the constraints on non-radiative decay of neutrinos from the
observations of solar neutrino experiments. The standard oscillation hypothesis
among three neutrinos solves the solar and atmospheric neutrino problems. Decay
of a massive neutrino mixed with the electron neutrino results in the depletion
of the solar neutrino flux. We introduce neutrino decay in the oscillation
hypothesis and demand that decay does not spoil the successful explanation of
solar and atmospheric observations. We obtain a lower bound on the ratio of the
lifetime over the mass of $\nu_2$, $(\tau_2/m_2) > 22.7 (\srm/\MeV)$ for the
MSW solution of the solar neutrino problem and $(\tau_2/m_2) > 27.8
(\srm/\MeV)$ for the VO solution (at 99% C.L.).


title: Bi-maximal mixing and Bilinear R violation

abstract:
  We perform a general analytic study of feasibility of obtaining a combined
explanation for the deficits in the solar and the atmospheric neutrino fluxes
with two large mixing angles in supersymmetric model with bilinear R parity
violations. The required hierarchy among the solar and atmospheric neutrino
mass scales follows in this framework in the presence of an approximate Higgs -
slepton universality at the weak scale. The solar mixing angle is shown to be
related to non-universality in slepton mass terms specifically to differences
in soft parameters of the first two leptonic generations. It is shown that this
flavour universality violation should be as strong as the Higgs-slepton
universality violation if solar neutrino mixing angle is to be large. The
standard supergravity models with universal boundary conditions at a high scale
lead to the required Higgs-slepton universality violations but the predicted
violation of flavour universality among the first two generations is much
smaller than required. This model therefore cannot provide an explanation of
large solar neutrino mixing angle unless some universality violations in soft
supersymmetry breaking parameters are introduced at a high scale itself.


title:
Closed-Form Summation of RG-Accessible Logarithmic Contributions to
  Semileptonic B-Decays and Other Perturbative Processes

abstract:
  For any perturbative series that is known to $k$-subleading orders of
perturbation theory, we utilise the process-appropriate renormalization-group
(RG) equation in order to obtain all-orders summation of series terms
proportional to $\alpha^n \log^{n-k}(\mu^2)$ with $k = {0,1,2,3}$,
corresponding to the summation to all orders of the leading and
subsequent-three-subleading logarithmic contributions to the full perturbative
series. These methods are applied to the perturbative series for semileptonic
$b$-decays in both MS-bar and pole-mass schemes, and they result in RG-summed
series for the decay rates which exhibit greatly reduced sensitivity to the
renormalization scale $\mu$. Such summation via RG-methods of all logarithms
accessible from known series terms is also applied to perturbative QCD series
for vector- and scalar-current correlation functions, the perturbative static
potential function, the (single-doublet standard-model) Higgs decay amplitude
into two gluons, as well as the Higgs-mediated high-energy cross-section for
$W^+W^-\to ZZ$ scattering. The resulting RG-summed expressions are also found
to be much less sensitive to the renormalization scale than the original series
for these processes.


title:
Critical Correlations of Wilson Lines in SU(3) and the High Energy
  $\gamma^*p$ Cross Section

abstract:
  We discuss deep inelastic scattering at high energies as a critical
phenomenon in 2+1 space - time dimensions. In the limit of Bjorken $x \to 0$,
$QCD$ SU(3) with quark fields becomes a critical theory with a diverging
correlation length $\xi(x) \propto x^{-\frac{1}{2 \lambda_2}}$ where the
exponent $\lambda_2=2.52$ is obtained from the center group Z(3) of SU(3). We
conjecture that the dipole wave function of the virtual photon for transverse
sizes $1/Q<x_{\bot}<\xi$ obeys correlation scaling $\Psi \propto
(x_{\bot})^{-(1+n)}$ before exponentially decaying for distances larger than
the correlation length. Using this behavior combined with different $x$
-independent dipole proton cross sections we calculate the proton structure
function and compare with the experimental data. We take the good agreement
with the measured proton structure function F$_2(x,Q^2)$ as an indication that
at high energies dimensional reduction to an effective three dimensional theory
with a critical point occurs.


title:
Construction of Orthonormal Bases from the Vectors of the Problem in
  Minkowski Space

abstract:
  We propose to use the modified Gram -- Schmidt orthonormalization process in
Minkowski space for construction of orthonormal bases from the vectors of the
problem.


title:
Sparticle spectrum and constraints in anomaly mediated supersymmetry
  breaking models

abstract:
  We study in detail the particle spectrum in anomaly mediated supersymmetry
breaking models in which supersymmetry breaking terms are induced by the
super-Weyl anomaly. We investigate the minimal anomaly mediated supersymmetry
breaking models, gaugino assisted supersymmetry breaking models, as well as
models with additional residual nondecoupling D-term contributions due to an
extra U(1) gauge symmetry at a high energy scale. We derive sum rules for the
sparticle masses in these models which can help in differentiating between
them. We also obtain the sparticle spectrum numerically, and compare and
contrast the results so obtained for the different types of anomaly mediated
supersymmetry breaking models.


title:
Higgs Boson Production at Hadron Colliders: Signal and Background
  Processes

abstract:
  We review the theoretical status of signal and background calculations for
Higgs boson production at hadron colliders. Particular emphasis is given to
missing NLO results, which will play a crucial role for the Tevatron and the
LHC.


title:
Constraining four neutrino mass patterns from neutrinoless double beta
  decay

abstract:
  All existing data on neutrino oscillations (including those from the LSND
experiment) imply a four neutrino scheme with six different allowed mass
patterns. Some of the latter are shown to be disfavored by using a conservative
upper bound on the $\beta beta 0 \nu$ nuclear decay rate, if neutrinos are
assumed to be Majorana particles. Comparisons are also made with restrictions
from tritium $\beta$-decay and cosmology.


title:
Predictions on the neutrinoless double beta decay from the leptogenesis
  via the LHu flat direction

abstract:
  If the baryon asymmetry in the present universe is generated by decays of the
$L H_u$ flat direction, the observed baryon asymmetry requires the mass of the
lightest neutrino to be much smaller than the mass scale indicated from the
atmospheric and solar neutrino oscillations. Such a small mass of the lightest
neutrino leads to a high predictability on the rate of the neutrinoless double
beta ($0\nu\beta\beta$) decay. In this letter we show general predictions on
the $0\nu\beta\beta$ decay in the leptogenesis via the $LH_u$ flat direction.


title: On the mass relation of a meson nonet

abstract:
  It is pointed out that the omission of the effects of the transition between
quarkonia or the assumption that the transition between quarkonia is
flavor-independent would result in the inconsistent results for the
pseudoscalar meson nonet. It is emphasized that the mass relation of the
non-ideal mixing meson nonets should incorporate the effects of the
flavor-dependent transition between quarkonia. The new mass relations of a
meson nonet are presented.


title: Radiative Decay of $\Upsilon$ into a Scalar Glueball

abstract:
  We study the radiative decay of $\Upsilon$ into a scalar glueball $\Upsilon
\to \gamma G_s$ using QCD factorization. We find that for this process the
non-perturbative effects can be factorized into a matrix element well defined
in non-relativistic QCD (NRQCD) and the gluon distribution amplitude. The same
NRQCD matrix element appears also in leptonic decay of $\Upsilon$ and therefore
can be determined from data. In the asymptotic limit the gluon distribution
amplitude is known up to a normalization constant. Using a QCD sum-rule
calculation for the normalization constant, we obtain $Br(\Upsilon \to \gamma
G_s)$ to be in the range $(1\sim 2)\times 10^{-3}$. We also discuss some of the
implications for $\Upsilon \to \gamma f_i$ decays. Near future data from
CLEO-III can provide crucial information about scalar glueball properties.


title: U(1) Flavor Symmetry and Proton Decay in Supersymmetric Standard Model

abstract:
  Issues of proton decay are examined in supersymmetric standard model with
U(1) flavor symmetry. Dimension five proton-decay operators which arise
generically are controlled by the flavor symmetry. We show that unlike the
minimal supersymmetric SU(5) case the proton decay modes containing charged
lepton can have large branching ratios if the dimension five operators of
left-handed type dominate. Measuring the branching ratio of the electron mode
to the muon mode may reveal the mechanism of the neutrino mass generation. The
case with vanishing charges for Higgs doublets marginally survives the present
experimental bound on proton life time.


title: Analysis of the pion-kaon sigma-term and related topics

abstract:
  We calculate the one-loop contributions to the difference \Delta_{\pi K}
between the isoscalar on-shell pion-kaon scattering amplitude at the
Cheng-Dashen point and the scalar form factor \Gamma_K (2M_\pi^2) in the
framework of three flavor chiral perturbation theory. These corrections turn
out to be small. This is further sharpened by treating the kaons as heavy
fields (two flavor chiral perturbation theory). We also analyze the two-loop
corrections to the kaon scalar form factor based on a dispersive technique. We
find that these corrections are smaller than in the comparable case of the
scalar form factor of the pion. This is related to the weaker final state
interactions in the pion-kaon channel.


title: Resurrection of Grand Unified Theory Baryogenesis

abstract:
  A `new' scenario is proposed for baryogenesis. We show that delayed decay of
coloured Higgs particles in grand unified theories may generate excess baryon
number of the empirically desired amount, if the mass of the heaviest neutrino
is in the range $0.02 {\rm eV}<m_{\nu_3}< 0.8 {\rm eV}$, provided that
neutrinos are of the Majorana type. The scenario accommodates the case of
degenerate neutrino masses, in contrast to the usual leptogenesis scenario,
which does not work when three neutrino masses are degenerate.


title: Simulations of Q-Ball Formation

abstract:
  The fragmentation of the Affleck-Dine condensate is studied by utilizing 3+1
dimensional numerical simulations. The 3+1 dimensional simulations confirm that
the fragmentation process is very similar to the results obtained by 2+1
dimensional simulations. We find, however, that the average size of Q-balls in
3+1 dimensions is somewhat larger that in 2+1 dimensions. A filament type
structure in the charge density is observed during the fragmentation process.
The resulting final Q-ball distribution is strongly dependent on the initial
conditions of the condensate and approaches a thermal one as the energy-charge
ratio of the Affleck-Dine condensate increases.


title: Constraining R Violation from Anomalous Abelian Family Symmetry

abstract:
  The patterns of R violation resulting from imposition of a gauged U(1)
horizontal symmetry, on the minimal supersymmetric standard model are
systematically analyzed. We concentrate on a class of models with integer U(1)
charges chosen to reproduce the quark masses and mixings as well as charged
lepton masses exactly or approximately. The U(1) charges are further restricted
from the requirement that very large bilinear lepton number violating terms
should not be allowed in the super-potential. It is shown that all the
trilinear $\lambda'_{ijk}$ and all but at most two trilinear $\lambda_{ijk}$
couplings vanish or are enormously suppressed.


title: Calculation of the Chiral Lagrangian Coefficients

abstract:
  We present a systematic way to combine the global color model and the
instanton liquid model to calculate the chiral
  Lagrangian coefficients. Our numerical results are in agreement well with the
experimental values.


title: Relic neutrino masses and the highest energy cosmic rays

abstract:
  We consider the possibility that a large fraction of the ultrahigh energy
cosmic rays are decay products of Z bosons which were produced in the
scattering of ultrahigh energy cosmic neutrinos on cosmological relic
neutrinos. We compare the observed ultrahigh energy cosmic ray spectrum with
the one predicted in the above Z-burst scenario and determine the required mass
of the heaviest relic neutrino as well as the necessary ultrahigh energy cosmic
neutrino flux via a maximum likelihood analysis. We show that the value of the
neutrino mass obtained in this way is fairly robust against variations in
presently unknown quantities, like the amount of neutrino clustering, the
universal radio background, and the extragalactic magnetic field, within their
anticipated uncertainties. Much stronger systematics arises from different
possible assumptions about the diffuse background of ordinary cosmic rays from
unresolved astrophysical sources. In the most plausible case that these
ordinary cosmic rays are protons of extragalactic origin, one is lead to a
required neutrino mass in the range 0.08 eV - 1.3 eV at the 68 % confidence
level. This range narrows down considerably if a particular universal radio
background is assumed, e.g. to 0.08 eV - 0.40 eV for a large one. The required
flux of ultrahigh energy cosmic neutrinos near the resonant energy should be
detected in the near future by AMANDA, RICE, and the Pierre Auger Observatory,
otherwise the Z-burst scenario will be ruled out.


title:
Baryon magnetic moments and sigma terms in lattice-regularized chiral
  perturbation theory

abstract:
  An SU(3) chiral Lagrangian for the lightest decuplet of baryons is
constructed on a discrete lattice of spacetime points, and is added to an
existing lattice Lagrangian for the lightest octets of mesons and baryons. A
nonzero lattice spacing renders all loop integrations finite, and the continuum
limit of any physical observable is identical to the result obtained from
dimensional regularization. Chiral symmetry and gauge invariance are preserved
even at nonzero lattice spacing. Specific calculations discussed here include
the non-renormalization of a conserved vector current, the magnetic moments of
octet baryons, and the pi N and KN sigma terms that relate to the nucleon's
strangeness content. The quantitative difference between physics at a nonzero
lattice spacing and physics in the continuum limit is easily computed, and it
represents an expectation for the size of discretization errors in
corresponding lattice QCD simulations.


title:
Flavor changing Z-decays from scalar interactions at a Giga-Z Linear
  Collider

abstract:
  The flavor changing decay Z -> d_I \bar{d}_J is investigated with special
emphasis on the b \bar{s} final state. Various models for flavor violation are
considered: two Higgs doublet models (2HDM's), supersymmetry (SUSY) with flavor
violation in the up and down-type squark mass matrices and SUSY with flavor
violation mediated by R-parity-violating interaction. We find that, within the
SUSY scenarios for flavor violation, the branching ratio for the decay Z -> b
\bar{s} can reach 10^{-6} for large \tan\beta values, while the typical size
for this branching ratio in the 2HDM's considered is about two orders of
magnitudes smaller at best. Thus, flavor changing SUSY signatures in radiative
Z decays such as Z -> b \bar{s} may be accessible to future ``Z factories''
such as a Giga-Z version of the TESLA design.


title:
Extraction of alpha_s from the Gross--Llewellyn Smith sum rule using
  Borel resummation

abstract:
  Using the CCFR data for the Gross--Llewellyn Smith (GLS) sum rule, we extract
the strong coupling constant via Borel resummation of the perturbative QCD
calculation. The method incorporates the correct nature of the first infrared
renormalon singularity, and employs a conformal mapping to improve the
convergence of the QCD perturbation expansion. The important twist-four
contribution is calculated from resummation of the perturbation theory, which
is based on the ansatz that the higher--twist contribution has a cut
singularity only along the positive real axis on the complex coupling plane.
Thus obtained, the strong coupling constant corresponding to the central GLS
experimental value is in good agreement with the world average.


title:
Electric dipole moments of Hg, Xe, Rn, Ra, Pu, and TlF induced by the
  nuclear Schiff moment and limits on time-reversal violating interactions

abstract:
  We have calculated the atomic electric dipole moments (EDMs) induced in
^{199}Hg, ^{129}Xe, ^{223}Rn, ^{225}Ra, and ^{239}Pu by their respective
nuclear Schiff moments S. The results are (in units 10^{-17}S(e {fm}^{3})^{-1}e
cm): d(^{199}Hg)=-2.8, d(^{129}Xe)=0.38, d(^{223}Rn)=3.3, d(^{225}Ra)=-8.5,
d(^{239}Pu)=-11. We have also calculated corrections to the parity- and
time-invariance-violating (P,T-odd) spin-axis interaction constant in TlF.
These results are important for the interpretation of atomic and molecular
experiments on EDMs in terms of fundamental P,T-odd parameters.


title: Large Nc physics from the lattice

abstract:
  I summarise what lattice methods can contribute to our understanding of the
phenomenology of QCD at large Nc and describe some recent work on the physics
of SU(Nc) gauge theories. These non-perturbative calculations show that there
is indeed a smooth Nc -> infinity limit and that it is achieved by keeping
g.g.Nc fixed, confirming the usual diagrammatic analysis. The lattice
calculations support the crucial assumption that the theory remains linearly
confining at large Nc. Moreover we see explicitly that Nc=3 is `close to'
Nc=infinity for many physical quantities. We comment on the fate of topology
and the deconfining transition at large Nc. We find that multiple confining
strings are strongly bound. The string tensions, K(k), of these k-strings are
close to the M(-theory)QCD-inspired conjecture as well as to `Casimir scaling'
with the most accurate recent calculations favouring the former. We point out
that closed k-strings provide a natural way for non-perturbative effects to
introduce O(1/Nc) corrections into the pure gauge theory, in contradiction to
the conventional diagrammatic expectation.


title:
Simple solutions of relativistic hydrodynamics for longitudinally
  expanding systems

abstract:
  Simple, self-similar, analytic solutions of 1+1 dimensional relativistic
hydrodynamics are presented, generalizing Bjorken's solution to inhomogeneous
rapidity distribution.


title: Thermodynamics of Clan Production

abstract:
  Scenarios for particle production in the GeV and TeV regions are reviewed.
The expected increase with c.m. energy of the average number of clans for the
soft component and the decrease for the semihard one indicate possible
classical and quantum behaviour of gluons, respectively. Clan thermodynamics,
discussed in the paper, appears as the natural framework to deal with such
phenomena.


title: The Precision of Higgs Boson Measurements and Their Implications

abstract:
  The prospects for a precise exploration of the properties of a single or many
observed Higgs bosons at future accelerators are summarized, with particular
emphasis on the abilities of a Linear Collider (LC). Some implications of these
measurements for discerning new physics beyond the Standard Model (SM) are also
discussed.


title: Lepton flavor violation decays with the fourth generation neutrino

abstract:
  We investigate the lepton flavor violation decays, $\tau \to \mu\gamma$,
$\tau \to e\gamma$ and $\mu \to e\gamma$, in the framwork of a squential fourth
generation model with a heavy fourth neutrino, $\nu'$. Using the recent
experimental bounds, we can obtain the constraints of the $4\times 4$ leptonic
mixing matrix element factors, $V_{1\nu'},V_{2\nu'}$ and $V_{3\nu'}$. We find
that LFV decays can give strigent costraints on the parameter space of the 4th
neutrino mass $m_{\nu'}$.


title: Classical Computation of Elliptic Flow at Large Transverse Momentum

abstract:
  We compute the contribution of classical fields to the second Fourier
coefficient (v_2) of the azimuthal gluon distribution at large transverse
momentum in heavy ion collisions. We find that the classical contribution to
the flow alone cannot account for the experimentally observed behavior of
v_2(p_t) at large transverse momentum p_t.


title: Symmetries and Generalisations of Tri-Bimaximal Neutrino Mixing

abstract:
  Tri-bimaximal mixing is a specific lepton mixing ansatz, which has been shown
to account very successfully for the established neutrino oscillation data.
Working in a particular basis (the `circulant basis'), we identify three
independent symmetries of tri-bimaximal mixing, which we exploit to set the
tri-bimaximal hypothesis in context, alongside some simple, phenomenologically
interesting CP-conserving and CP-violating generalisations.


title: Gauge and Scheme Dependence of Mixing Matrix Renormalization

abstract:
  We revisit the issue of mixing matrix renormalization in theories that
include Dirac or Majorana fermions. We show how a gauge-variant on-shell
renormalized mixing matrix can be related to a manifestly gauge-independent one
within a generalized ${\bar {\rm MS}}$ scheme of renormalization. This
scheme-dependent relation is a consequence of the fact that in any scheme of
renormalization, the gauge-dependent part of the mixing-matrix counterterm is
ultra-violet safe and has a pure dispersive form. Employing the unitarity
properties of the theory, we can successfully utilize the afore-mentioned
scheme-dependent relation to preserve basic global or local symmetries of the
bare Lagrangian through the entire process of renormalization. As an immediate
application of our study, we derive the gauge-independent renormalization-group
equations of mixing matrices in a minimal extension of the Standard Model with
isosinglet neutrinos.


title: Avoiding the Landau-pole in perturbative QCD

abstract:
  We propose an alternative perturbative expansion for QCD. All scheme and
scale dependence is reduced to one free parameter. Fixing this parameter with a
fastest apparent convergence criterion gives sensible results in the whole
energy region. We apply the expansion to the calculation of the zero flavor
triple gluon vertex, the quark gluon vertex, the gluon propagator and the ghost
propagator. A qualitative agreement with the corresponding lattice results is
found.


title: Lepton Universality, Rare Decays and Split Fermions

abstract:
  We investigate the constraint on the split fermions in extra dimensions by
considering the universality of $W$ leptonic decays $W\to l_i \nu_i$, the
charged lepton decays $l_i \ra l_j\nu_i\bar{\nu}_j$, and the lepton flavor
violating process $l_i\ra \bar{l}_j l_k l_h$ where $l_i= e,\mu$ or $\tau$. For
the Standard Model (SM) background of $W\ra l_i \nu_i$, we extended the one
loop quantum correction to include effects of order $m_l^2/M_W^2$ and the Higgs
mass dependence. We find that in general the split fermion scenarios give rise
to a 4D effective Yukawa matrix of the Kaluza-Klein Higgs bosons is misaligned
with respect to the fermion mass matrix. This holds true also for gauge bosons
as well. This leads to decays of $l_i\ra \bar{l_j}l_k l_h$ at tree level and
muonium antimuonium conversion. Interestingly the leptonic universality of $W$
boson decays are not affected at this level.


title: Elliptic Flow from Minijet Production in Heavy Ion Collisions

abstract:
  We calculate the contribution to the elliptic flow observable v2 from
two-particle correlations in minijet production in ultrarelativistic heavy ion
collisions. We use a minijet production cross section derived in a model
inspired by saturation approach to high energy scattering. Resulting
differential elliptic flow v2(pT) is an increasing function of pT for
transverse momenta below the saturation scale Qs. At higher transverse momenta
(pT > Qs) differential flow stops growing and becomes approximately constant,
reproducing the elliptic flow saturation data reported by STAR. The centrality
dependence of the minijet contribution to v2 is also in good agreement with the
data.


title: Measuring leptonic CP Violation in Neutrinoless Double Beta Decay

abstract:
  We investigate under which circumstances one can show the existence of
leptonic CP violation with the help of a positive or negative signal in
neutrinoless double beta decay. The possibilities of cancellations are
investigated for special mass hierarchies and the different solar solutions.
The possibility that the mixing angle connected with the solar neutrino problem
is smaller or larger than pi/4 is taken into account. The non-maximality of
that angle in case of the LMA solution allows to make several useful
statements. The four different CP conserving possibilities are analyzed. It is
implemented how precisely the oscillation parameters will be known after
current and future experiments have taken data. The area in parameter space, in
which CP violation has to take place, is largest for the LOW solution and in
general larger for the inverse mass scheme.