title: Rate of photon production from hot hadronic matter

abstract:
  Thermal photon emission rates from hot hadronic matter are studied to order
$e^{2}g^{4}$, where $g$ indicates a strong-interaction coupling constant.
Radiative decay of mesons, Compton and annihilation processes for hadrons, and
bremsstrahlung reactions are all considered. Compared to the standard rates
from the literature, one finds two orders of magnitude increase for low photon
energies stemming mainly from bremsstrahlung and then a modest increase (factor
of 2) for intermediate and high energy photons owing to radiative decays for a
variety of mesons and from other reactions involving strangeness. These results
could have important consequences for electromagnetic radiation studies at
RHIC.


title: Hadronic Production of Thermal Photons

abstract:
  We study the thermal emission of photons from hot and dense strongly
interacting hadronic matter at temperatures close to the expected phase
transition to the Quark-Gluon Plasma (QGP). Earlier calculations of photon
radiation from ensembles of interacting mesons are re-examined with additional
constraints, including new production channels as well as an assessment of
hadronic form factor effects. Whereas strangeness-induced photon yields turn
out to be moderate, the hitherto not considered t-channel exchange of omega
mesons is found to contribute appreciably for photon energies above ~1.5 GeV.
The role of baryonic effects is assessed using existing many-body calculations
of lepton pair production. We argue that our combined results constitute a
rather realistic emission rate, appropriate for applications in relativistic
heavy-ion collisions. Supplemented with recent evaluations of QGP emission, and
an estimate for primordial (hard) production, we compute photon spectra at SPS,
RHIC and LHC energies.


title:
The resummation of inter-jet energy flow for gaps-between-jets processes
  at HERA

abstract:
  We calculate resummed perturbative predictions for gaps-between-jets
processes and compare to HERA data. Our calculation of this non-global
observable needs to include the effects of primary gluon emission (global
logarithms) and secondary gluon emission (non-global logarithms) to be correct
at the leading logarithm (LL) level. We include primary emission by calculating
anomalous dimension matrices for the geometry of the specific event definitions
and estimate the effect of non-global logarithms in the large $N_c$ limit. The
resulting predictions for energy flow observables are consistent with
experimental data.


title:
Uncertainties of predictions from parton distributions. I: Theoretical
  errors

abstract:
  We study the uncertainties in parton distributions, determined in global fits
to deep inelastic and related hard scattering data, due to so-called
theoretical errors. Amongst these, we include potential errors due to the
change of perturbative order (NLO to NNLO), ln(1/x) and ln(1-x) effects,
absorptive corrections and higher-twist contributions. We investigate these
uncertainties both by including explicit corrections to our standard global
analysis and by examining the sensitivity to changes of the x,Q^2,W^2 cuts on
the data that are fitted. In this way we expose those kinematic regions where
the conventional DGLAP description is inadequate. As a consequence we obtain a
set of NLO, and of NNLO, conservative partons where the data are fully
consistent with DGLAP evolution, but over a restricted kinematic domain. We
also examine the potential effects of such issues as the choice of input
parameterization, heavy target corrections, assumptions about the strange quark
sea and isospin violation. Hence we are able to compare the theoretical errors
with those uncertainties due to errors on the experimental measurements, which
we studied previously. We use W and Higgs boson production at the Tevatron and
the LHC as explicit examples of the uncertainties arising from parton
distributions. For many observables the theoretical error is dominant, but for
the cross section for W production at the Tevatron both the theoretical and
experimental uncertainties are small, and hence the NNLO prediction may serve
as a valuable luminosity monitor.


title: Strangeness Production in Nuclear Matter and Expansion Dynamics

abstract:
  Thermodynamical properties of hot and dense nuclear matter are analyzed and
compared for different equation of state (EoS). It is argued that the softest
point of the equation of state and the strangeness separation on the phase
boundary can manifest themselves in observables. The influence of the EoS and
the order of the phase transition on the expansion dynamics of nuclear matter
and strangeness excitation function is analyzed. It is shown that bulk
properties of strangeness production in A-A collisions depend only weakly on
the particular form of the EoS. The predictions of different models are related
with experimental data on strangeness production.


title: Coherent Production of Pairs of Parabosons of Order 2

abstract:
  A parameter-free statistical model is used to study multiplicity signatures
for coherent production of charged-pairs of parabosons of order p=2 in
comparison with those arising in the case of ordinary bosons, p=1. Two
non-negative real parameters arise because "ab" and "ba" are fundamentally
distinct pair operators of charge "+1", A-quanta and charge "-1", B-quanta
parabosons. In 3D plots of P(q)_m = "The probability of m paraboson
charged-pairs and q positive parabosons" versus < n > and < n^2 >, the p=1
curve is found to lie on the relatively narrow 2D p=2 surface.


title: Pairing of Parafermions of Order 2: Seniority Model

abstract:
  As generalizations of the fermion seniority model, four multi-mode
Hamiltonians are considered to investigate some of the consequences of the
pairing of parafermions of order two. 2-particle and 4-particle states are
explicitly constructed for H_A = - G A^+ A with A^+}= 1/2 Sum c_{m}^+ c_{-m}^+
and the distinct H_C = - G C^+ C with C^+}= 1/2 Sum c_{-m}^+ c_{m}^+, and for
the time-reversal invariant H_(-)= -G (A^+ - C^+)(A-C) and H_(+) = -G
(A^+dagger + C^+)(A+C), which has no analogue in the fermion case. The spectra
and degeneracies are compared with those of the usual fermion seniority model.


title: Yukawa Hierarchies From Extra Dimensions With Small FCNC

abstract:
  We investigate a class of extra dimensional models where all of the Standard
Model fermions are localized to a single fixed point in an $S_1/Z_2$ orbifold,
and each species is localized with an exponential wavefunction with a different
width. We show that this naturally generates Yukawa hierarchies of the size
present in the Standard Model, and we find a set of model parameters that
reproduces the observed masses and mixings to experimental accuracy. In
addition, the dominant constraints, arising from flavor changing neutral
currents, are shown to restrict the compactification scale to be $1/R \ge 2-5
\tev$, which is a much less stringent constraint than in similar extra
dimensional models of the Yukawa hierarchy.


title: Neutrino Mass and the SU(2)_R Breaking Scale

abstract:
  The neutrino sector in a left-right extension of the Standard Model depends
on how SU(2)_R is broken. I list all possible scenarios, including the ones
where the Majorana nu_R mass is naturally much smaller than the SU(2)_R
breaking scale, which is desirable for generating the proper baryon asymmetry
of the Universe. The best such choice is identified and discussed.


title: Anomalous U(1) symmetry and lepton flavor violation

abstract:
  We show that in a large class of models based on anomalous U(1) symmetry
which addresses the fermion mass hierarchy problem, leptonic flavor changing
processes are induced that are in the experimentally interesting range. The
flavor violation occurs through the renormalization group evolution of the soft
SUSY breaking parameters between the string scale and the U(1)_A breaking
scale. We derive general expressions for the evolution of these parameters in
the presence of higher dimensional operators. Several sources for the flavor
violation are identified: flavor-dependent contributions to the soft masses
from the U(1)_A gaugino, scalar mass corrections proportional to the trace of
U(1)_A charge, non-proportional A-terms from vertex corrections, and the U(1)_A
D-term. Quantitative estimates for the decays \mu -> e \gamma and \tau -> \mu
\gamma are presented in supergravity models which accommodate the relic
abundance of neutralino dark matter.


title: Top quark physics and QCD: Progress since the TESLA TDR

abstract:
  I review progress on investigations concerning top quark physics and QCD at a
future linear e+e- collider that has been achieved since the presentation of
the TESLA technical design report in spring 2001. I concentrate on studies that
have been presented during the workshop series of the Extended Joint ECFA/DESY
Study on Physics and Detectors for a Linear Electron-Positron Collider.


title: Higher Twist Effects in Hadronic B Decays

abstract:
  Within the framework of QCD factorization, we discuss various important
corrections arising from higher twist distribution amplitudes of mesons in the
hadronic B decays.


title: Vector Mesons on the Light Front

abstract:
  We apply the light-front quantization to the Nambu--Jona-Lasinio model with
the vector interaction, and compute vector meson's mass and light-cone
wavefunction in the large N limit. Following the same procedure as in the
previous analyses for scalar and pseudo-scalar mesons, we derive the
bound-state equations of a q-qbar system in the vector channel. We include the
lowest order effects of the vector interaction. The resulting transverse and
longitudinal components of the bound-state equation look different from each
other. But eventually after imposing an appropriate cutoff, one finds these two
are identical, giving the same mass and the same (spin-independent) light-cone
wavefunction. Mass of the vector meson decreases as one increases the strength
of the vector interaction.


title: Radiative Neutrino Masses in a SUSY GUT Model

abstract:
  Radiatively-induced neutrino mass matrix is investigated within the framework
of an SU(5) SUSY GUT model. The model has matter fields of three families
\bar{5}_{L(+)i}+5_{L(+)i} in addition to the ordinary matter fields
\bar{5}_{L(-)i}+10_{L(+)i} and Higgs fields H_{(+)}+\bar{H}_{(0)}, where
(+,0,-) denote the transformation properties (\omega^{+1},\omega^0,\omega^{-1})
(\omega^3=+1) under a discrete symmetry Z_3. R-parity violating terms are given
by \bar{5}_{L(+)} \bar{5}_{L(+)} 10_{L(+)}, while the Yukawa interactions are
given by \bar{H}_{(0)} \bar{5}_{L(-)} 10_{L(+)}, i.e. the \bar{5}-fields in
both are different from each other. The Z_3 symmetry is only broken by the
terms \bar{5}_{L(+)i}5_{L(+)i} softly, so that the
\bar{5}_{L(+)i}\leftrightarrow \bar{5}_{L(-)i} mixings appear at \mu < M_X. Of
the R-parity violating terms \bar{5}_{L(+)} \bar{5}_{L(+)} 10_{L(+)}, only the
terms (e_L\nu_-\nu_Le_)e_R^c sizably appear at \mu < M_X.


title:
Hybrid meson production by electromagnetic and weak interactions in a
  flux-tube simulation of lattice QCD

abstract:
  We calculate rates for hybrid meson production by electromagnetic and weak
interactions in the flux-tube model. Applications include photo and
electroproduction at Jefferson Laboratory and HERA, and the production of light
strange and charmed hybrids in the weak decays of heavy flavours.
Photoproduction of some light hybrids is predicted to be prominent in charge
exchange reactions, $\gamma p \to n \cal{H}$ and accessible in $\gamma p \to p
\cal{H}$. Production of light or charmed hybrids in $B$ and $D$ decays may be
feasible with high statistics. Photoproduction of the axial hybrid meson is
predicted to be large courtesy of $\pi$ exchange, and its strange counterpart
is predicted in $B \to \psi K_H(1^+)$ with $b.r. \sim 10^{-4}$. Production
rates for exotic hybrid candidates $1^{-+};(0,2)^{+-}$ are given special
attention. Selection rules that can help to distinguish between hybrid and
conventional states with the same $J^{PC}$ are noted.


title: The "forbidden" decays of hybrid mesons to $\pi \rho$ can be large

abstract:
  The observation of $\pi_1(1600) \to \pi \rho$ is shown in the flux-tube model
to be compatible with this state being a hybrid meson with branching ratio to
this channel $\sim 30%$. The $\pi \rho$ widths of other hybrids are related by
rather general arguments. These results enable cross sections for
photoproduction of hybrids to be predicted.


title:
Final State Interactions in the Ds+ --> omega pi+ and Ds+ --> rho0 pi+
  Decays

abstract:
  We investigate the decay mechanisms in the Ds+ --> omega pi+ and Ds+ --> rho0
pi+ transitions. The naive factorization ansatz predicts vanishing amplitude
for the Ds+ --> omega pi+ decay, while the Ds+ --> rho0 pi+ decay amplitude
does have an annihilation contribution also in this limit. Both decays can
proceed through intermediate states of hidden strangeness, e.g. K, K*, which we
estimate in this paper. These contributions can explain the experimental value
for the Ds+ --> omega pi+ decay rate, which no longer can be viewed as a clean
signature of the annihilation decay of Ds+. The combination of the \pi(1300)
pole dominated annihilation contribution and the internal K, K* exchange can
saturate present experimental upper bound on Ds+ --> rho0 pi+ decay rate, which
is therefore expected to be within the experimental reach. Finally, the
proposed mechanism of hidden strangeness FSI constitutes only a small
correction to the Cabibbo allowed decay rates Ds--> K K*, phi pi, which are
well described already in the factorization approximation.


title: Radiative Penguin Decays from BABAR

abstract:
  We summarize the latest BABAR results on B -> K(*) l+l- and B -> rho (omega)
gamma


title:
Large Beyond-Leading-Order Effects in b -> s gamma in Supersymmetry with
  General Flavor Mixing

abstract:
  We examine squark--gluino loop effects on the process $b \to s \gamma$ in
minimal supersymmetry with general flavor mixing in the squark sector. In the
regime of heavy squarks and gluino, we derive analytic expressions for the
beyond--LO corrections to the Wilson coefficients and find them to be often
large, especially at large $\tan\beta$ and $\mu>0$. The ensuing ranges of
values of the Wilson coefficients are typically smaller than in the LO
approximation, and sometimes even change sign. This has the effect of often
reducing, relative to the LO, the magnitude of supersymmetric contributions to
$BR(B \to X_s \gamma)$. This ``focusing effect'' is caused by contributions
from: (i) an RG evolution of the Wilson coefficients; (ii) a correction to the
LO chargino contribution to the Wilson coefficients, which can considerably
reduce the LO gluino contribution. This partial cancellation of the two
contributions takes place only in the case of general flavor mixing. As a
result, stringent lower bounds on the mass scale of superpartners, which apply
in the case of minimal flavor violation, can be substantially reduced for even
small departures from the scenario. The often disfavored case of $\mu<0$ can
also become allowed for $M_{SUSY}$ as small as $\sim$ 200 GeV, compared to >
$\sim$ 500 GeV at LO and over 2 TeV in the case of minimal flavor violation.
Limits on the allowed amount of flavor mixing among the 2nd and 3rd generation
down--type squarks are also typically considerably weakened. The input CKM
matrix element $K^{(0)}_{cb}$ can be larger than the experimental value by a
factor of ten, or can be as small as zero.


title: Complementarity of a Low Energy Photon Collider and LHC Physics

abstract:
  We discuss the complementarity between the LHC and a low energy photon
collider. We mostly consider the scenario, where the first linear collider is a
photon collider based on dual beam technology like CLIC.


title:
The Tensor Current Divergence Equation in U(1) Gauge Theories is Free of
  Anomalies

abstract:
  The possible anomaly of the tensor current divergence equation in U(1) gauge
theories is calculated by means of perturbative method. It is found that the
tensor current divergence equation is free of anomalies.


title:
Soft-Gluon Resummation for Heavy Quark Production in Charged-Current
  Deep Inelastic Scattering

abstract:
  We study soft-gluon radiation for heavy quark production in charged-current
Deep Inelastic Scattering processes. We resum large-x contributions to the
MSbar coefficient function to next-to-leading logarithmic accuracy and present
results for charm quark structure functions for several values of the ratio
m_c/Q. The effect of the resummation turns out to be visible, especially at
small Q^2, and the results exhibit very little dependence on factorization and
renormalization scales. The impact of our calculation on structure function
measurements at NuTeV and HERA experiments is discussed.


title:
ELRADGEN: Monte Carlo generator for radiative events in elastic
  electron-proton scattering

abstract:
  We discuss the theoretical approach and practical algorithms for simulation
of radiative events in elastic ep-scattering. A new Monte Carlo generator for
real photon emission events in the process of elastic electron-proton
scattering is presented. We perform a few consistency checks and present
numerical results.


title: The self-consistent bounce: an improved nucleation rate

abstract:
  We generalize the standard computation of homogeneous nucleation theory at
zero temperature to a scenario in which the bubble shape is determined
self-consistently with its quantum fluctuations. Studying two scalar models in
1+1 dimensions, we find the self-consistent bounce by employing a two-particle
irreducible (2PI) effective action in imaginary time at the level of the
Hartree approximation. We thus obtain an effective single bounce action which
determines the rate exponent. We use collective coordinates to account for the
translational invariance and the growth instability of the bubble and finally
present a new nucleation rate prefactor. We compare the results with those
obtained using the standard 1-loop approximation and show that the
self-consistent rate can differ by several orders of magnitude.


title: Fragmentation functions of mesons in the Field-Feynman model

abstract:
  The fragmentation functions of the pion with distinction between
$D_{u}^{\pi^{+}}$, $D_{d}^{\pi^{+}}$, and $D_{s}^{\pi^{+}}$ are studied in the
Field-Feynman recursive model, by taking into account the flavor structure in
the excitation of quark-antiquark pairs by the initial quarks. The obtained
analytical results are compatible with available empirical results. The
framework is also extended to predict the fragmentation functions of the kaon
with distinction between $D_{\bar{s}}^{K^{+}}(z)$, $D_{u}^{K^{+}}(z)$,
$D_{s}^{K^{+}}(z)$, and $D_{d}^{K^{+}}(z)$. This work gives a significant
modification of the original model, and the predictions can be tested by future
experiments on the fragmentation functions of the kaon.


title: The renormalization group effect to the bi-maximal mixing

abstract:
  We discuss whether the bi-maximal mixing given at GUT is consistent with the
solar mixing at the normal side at the low energy. We consider the radiative
corrections due to the tau-Yukawa, the neutrino-Yukawa and the slepton
threshold corrections and discuss in what situation the maximal solar angle
rotates towards the normal side. In this scheme, the |V_{13}| and the Dirac CP
phase delta are induced radiatively and we estimate these values.


title: Anomalous U(1) D-term Contribution in Type I String Models

abstract:
  We study the $D$-term contribution for anomalous U(1) symmetries in type I
string models and derive general formula for the $D$-term contribution,
assuming that the dominant source of SUSY breaking is given by $F$-terms of the
dilaton, (overall) moduli or twisted moduli fields. On the basis of the
formula, we also point out that there are several different features from the
case in heterotic string models. The differences originate from the different
forms of K\"ahler potential between twisted moduli fields in type I string
models and the dilaton field in heterotic string models.


title:
Neutrino production, oscillation and detection in the presence of
  general four-fermion interactions

abstract:
  In this note we investigate the impact of new physics in the form of general
four-fermion interactions on neutrino oscillation signals. We develop a field
theoretic description of the overall oscillation process which includes the
non-standard interactions during the neutrino production, propagation and
detection stages. Insights gained during the development of this formalism
regarding the possibility of new interactions mimicking neutrino mass
differences are expounded. The impact of possible new physics is assessed by
studying the $\nu_\mu\to\nu_\tau$ oscillation channel in vacuum and the
$\nu_e\to \nu_\mu$ channel in matter. Although it is known that the effects of
new interactions can only act as a perturbation to the leading oscillation
parameters, we find that great care needs to be taken when drawing conclusions
regarding the strength of new couplings from oscillation measurements.


title: ICTP Lectures on Large Extra Dimensions

abstract:
  I give a brief and elementary introduction to braneworld models with large
extra dimensions. Three conceptually distinct scenarios are outlined: (i) Large
compact extra dimensions; (ii) Warped extra dimensions; (iii) Infinite-volume
extra dimensions. As an example I discuss in detail an application of (iii) to
late-time cosmology and the acceleration problem of the Universe.


title:
Point-like sources of Euclidean non-abelian field in the instanton
  liquid

abstract:
  An appraisal of average energy of Euclidean non-abelian point-like source in
the instanton liquid is calculated. It behaves linearly increasing at large
distances while unscreened. For the dipole in colour singlet state this energy
increases linearly again with the separation increasing and its "tension"
coefficient develops the magnitude pretty similar to the lattice approach and
other model estimates. The situation of sources arbitrary oriented in colour
space is perturbatively considered.


title: Pentaquark in the Skyrme Model

abstract:
  The mass of the newly discovered pentaquark is calculated within the
framework of the SU(3) Skyrme Model. Various estimates based on the \emph{model
independent} approach are compared with the model results and with the Chiral
Quark Model. Our discussion shows that $\Theta^{+}$ is light with the mass of
the order 1.5 GeV.


title: CP violation in models with TeV-scale SUSY breaking

abstract:
  We estimate contributions of the goldstino supermultiplet to the electric
dipole moment (EDM) in the case that the SUSY breaking scale \Lambda_S is of
order the TeV scale. We found that such contributions can saturate the
experimental bound if \Lambda_S is close to the soft mass scale. We also
discuss EDM in the gaugino mediated scenario on the warped geometry as an
example of models with the TeV-scale SUSY breaking.


title: Dijet cross sections in ep collisions: who is afraid of symmetric cuts?

abstract:
  Three widely used scenaria for defining cuts on transverse energies of jets
in ep collisions are discussed. All of them are shown to suffer from the same
sort of unphysical behaviour when the cut regions are subject to additional
constraints. This feature is inherent in the very way dijet cross sections are
defined and cannot be avoided. In particular, the symmetric cut scenario is
shown to be equally suitable for the comparison with NLO QCD calculations as
the asymmetric or sum-like ones.


title: Hadronic vacuum polarization effects in alpha_{em}(M_Z)

abstract:
  Recent evaluations of the hadronic vacuum polarization contributions to the
effective fine-structure constant alpha_{em}(M_Z) are summarized and commented.
A new update based on corrected CMD-2 data is presented. My new estimates are
Delta alpha_{had}^{(5)}(M_Z) = 0.027773 +/- 0.000354 (e^+e^- - data based) and
Delta alpha_{had}^{(5)}(M_Z) = 0.027664 +/- 0.000173 (via the Adler-function
and extended use of pQCD). Prospects of further possible progress is discussed.


title: Neutralino Dark Matter from MSSM Flat Directions in light of WMAP Result

abstract:
  The minimal supersymmetric standard model (MSSM) has a truly supersymmetric
way to explain both the baryon asymmetry and cold dark matter in the present
Universe, that is, ``Affleck-Dine baryo/DM-genesis.'' The associated late-time
decay of Q-balls directly connects the origins of the baryon asymmetry and dark
matter, and also predicts a specific nature of the LSP. In this paper, we
investigate the prospects for indirect detection of these dark matter
candidates observing high energy neutrino flux from the Sun, and hard positron
flux from the halo. We also update the previous analysis of the direct
detection in hep-ph/0205044 by implementing the recent result from WMAP
satellite.


title: Neutrino mass matrices leaving no trace

abstract:
  We point attention to the fact that in SO(10) models with non-canonical (type
II) see-saw mechanism and exact b-tau unification the trace of the neutrino
mass matrix is very small, in fact practically zero. This has the advantage of
being a basis independent feature. Taking a vanishing trace as input, immediate
phenomenological consequences for the values of the neutrino masses, the CP
phases or the predictions for neutrinoless double beta decay arise. We analyze
the impact of the zero trace condition for the normal and inverted mass
ordering and in case of CP conservation and violation. Simple candidate mass
matrices with (close to) vanishing trace and non-zero U_{e3} are proposed. We
also compare the results with the other most simple basis independent property,
namely a vanishing determinant.


title:
The QCD Pomeron in ultraperipheral heavy ion collisions: III.
  Photonuclear production of heavy quarks

abstract:
  We calculate the photonuclear production of heavy quarks in ultraperipheral
heavy ion collisions. The integrated cross section and the rapidity
distribution are computed employing sound high energy QCD formalisms as the
collinear and semihard approaches as well as the saturation model. In
particular, the color glass condensate (CGC) formalism is also considered using
a simple phenomenological parameterization for the color field correlator in
the medium, which allow us to obtain more reliable estimates for charm and
bottom production at
  LHC energies.


title:
Testing Color Evaporation in Photon-Photon Production of J/Psi at CERN
  LEP II

abstract:
  The DELPHI Collaboration has recently reported the measurement of J/Psi
production in photon-photon collisions at LEP II. These newly available data
provide an additional proof of the importance of colored c bar{c} pairs for the
production of charmonium because these data can only be explained by
considering resolved photon processes. We show here that the inclusion of color
octet contributions to the J/Psi production in the framework of the color
evaporation model is able to reproduce this data. In particular, the
transverse-momentum distribution of the J/Psi mesons is well described by this
model.


title: Soft-Collinear Messengers: A New Mode in Soft-Collinear Effective Theory

abstract:
  It is argued that soft-collinear effective theory for processes involving
both soft and collinear partons, such as exclusive B-meson decays, should
include a new mode in addition to soft and collinear fields. These
"soft-collinear messengers" can interact with both soft and collinear particles
without taking them far off-shell. They thus can communicate between the soft
and collinear sectors of the theory. The relevance of the new mode is
demonstrated with an explicit example, and the formalism incorporating the
corresponding quark and gluon fields into the effective Lagrangian is
developed.


title: Progress in the physics of massive neutrinos

abstract:
  The current status of the physics of massive neutrinos is reviewed with a
forward-looking emphasis. The article begins with the general phenomenology of
neutrino oscillations in vacuum and matter and documents the experimental
evidence for oscillations of solar, reactor, atmospheric and accelerator
neutrinos. Both active and sterile oscillation possibilities are considered.
The impact of cosmology (BBN, CMB, leptogenesis) and astrophysics (supernovae,
highest energy cosmic rays) on neutrino observables and vice versa, is
evaluated. The predictions of grand unified, radiative and other models of
neutrino mass are discussed. Ways of determining the unknown parameters of
three-neutrino oscillations are assessed, taking into account eight-fold
degeneracies in parameters that yield the same oscillation probabilities, as
well as ways to determine the absolute neutrino mass scale (from beta-decay,
neutrinoless double-beta decay, large scale structure and Z-bursts). Critical
unknowns at present are the amplitude of \nu_\mu to \nu_e oscillations and the
hierarchy of the neutrino mass spectrum; the detection of CP violation in the
neutrino sector depends on these and on an unknown phase. The estimated
neutrino parameter sensitivities at future facilities (reactors, superbeams,
neutrino factories) are given. The overall agenda of a future neutrino physics
program to construct a bottom-up understanding of the lepton sector is
presented.


abstract:
  We calculate the cross section for e+e- --> H+ e- nubar in the
two-Higgs-doublet model from one-loop diagrams involving top and bottom quarks.
This process offers the possibility of producing the charged Higgs boson at the
e+e- collider when its mass is more than half the center-of-mass energy, so
that charged Higgs pair production is kinematically forbidden. The cross
section receives contributions from both s-channel and t-channel processes; the
s-channel contribution dominates for center-of-mass energies of 1 TeV and
below. About 80% of the s-channel contribution comes from the resonant process
e+e- --> H+ W-, with W- --> e- nubar. The cross section is generally small,
below 0.01 fb for tan beta > 2, and falls with increasing tan beta.


title: Excited L=1 baryons in large Nc QCD

abstract:
  The physics of the orbitally excited baryons simplifies drastically in the
large Nc limit. The states are arranged into irreducible representations of the
contracted SU(4)_c symmetry, with mixing angles determined exactly. The ratios
of the strong couplings N* -> [N\pi]_{S,D} are predicted in this limit, with
results in agreement with those following from the quark model (with the large
Nc mixing angles). We present a phenomenological analysis of the observed
nonstrange baryons from the perspective of the 1/Nc expansion, including
constraints from their masses and strong decays.


title: Spectator Effects in the Decay B -> K \gamma \gamma

abstract:
  We report the results of the first computation related to the study of the
spectator effects in the rare decay mode $B\to K \gamma \gamma $ within the
framework of Standard Model. It is found that the account of these effects
results in the enhancement factor for the short-distance reducible contribution
to the branching ratio.


title:
General subtraction method for numerical calculation of one-loop QCD
  matrix elements

abstract:
  We present a subtraction scheme for eliminating the ultraviolet, soft, and
collinear divergences in the numerical calculation of an arbitrary one-loop QCD
amplitude with an arbitrary number of external legs. The subtractions consist
of local counter terms in the space of the four-dimensional loop momentum. The
ultraviolet subtraction terms reproduce MSbar renormalization. The key point in
the method for the soft and collinear subtractions is that, although the
subtraction terms are defined graph-by-graph and the matrix element is also
calculated graph-by-graph, the sum over graphs of the integral of each the
subtraction term can be evaluated analytically and provides the well known
simple pole structure that arises from subtractions from real emission graphs,
but with the opposite sign.


title:
About Possibility for Examination of Gravity Theories Using the Precise
  Measurement of Particle Lifetime

abstract:
  An approach for examination of gravitational theories using precision
measurements of particle lifetime is proposed. The expressions describing
dependence of particle lifetime on gravitational potential in Einstein's and
Newton's gravity theories are obtained. In the case of Newton's gravity there
is a dependence of the particle velocity direction from the direction of matter
location, which creates the gravitational potential. If the external
gravitational field is spherical symmetric then there would be no possibility
to distinguish these types of gravity. It is found that the deposit of
gravitational potential of the Universe (in the case of uniformly distribution
of matter in the Universe) in particle lifetime is approximately one percent.
On the basis of the available experimental data it is found that deposit of
asymmetric gravitational field is $\frac{\phi}{c^2} \simeq 2 \cdot 10^{-4}$,
i.e., if the experimental precision of particle lifetime measurements will be
several units of $10^{-4}$, then we could see this effect.
  In reality, the lifetime of elementary particles can be defined by effective
masses of these particles in the external gravitational field. The expressions
for effective masses of particles in the external gravitational field for two
gravity type theories are obtained. These masses can be used at computation of
the decay probability (or lifetime) of particles by standard methods. It is
shown that in this case it is also possible to distinguish these two types of
gravity theories.


title: Evidence that the a0(980) and f0(980) are not elementary particles

abstract:
  We study the interesting problem of whether it is possible to distinguish
composite from elementary particles. In particular we generalize a
model-independent approach of S. Weinberg to the case of unstable particles.
This allows us to apply our formalism to the case of the a0(980) and f0(980)
resonances and to address the question whether these particles are
predominantly genuine, confined quark states (of $\bar q q$ or $qq\bar q\bar q$
structure) or governed by mesonic components.


title: Neutrino Production of Resonances

abstract:
  We take a fresh look at the analysis of resonance production by neutrinos. We
consider three resonances $P_{33}, P_{11}$ and $S_{11}$ with a detailed
discussion of their form factors. The article presents results for free proton
and neutron targets and discusses the corrections which appear on nuclear
targets. The Pauli suppression factor is derived in the Fermi gas model and
shown to apply to resonance production. The importance of the various
resonances is demonstrated with numerical calculations. The $\Delta$-resonance
is described by two formfactors and its differential cross sections are
compared with experimental data. The article is self-contained and could be
helpful to readers who wish to reproduce and use these cross sections.


title:
Exclusive electromagnetic production of strangeness on the nucleon :
  review of recent data in a Regge approach

abstract:
  In view of the numerous experimental results recently released, we provide in
this letter an update on the performance of our simple Regge model for
strangeness electroproduction on the nucleon. Without refitting any parameters,
a decent description of all measured observables and channels is achieved. We
also give predictions for spin transfer observables, recently measured at
Jefferson Lab which have high sensitivity to discriminate between different
theoretical approaches.


title:
The Forward Backward asymmetries of $B \to X_s \tau^+ \tau^-$ in the
  MSSM

abstract:
  The relatively clean theoretical probes of the Standard Model (SM), and the
various theories beyond the SM, provided by radiative, semi-leptonic and
(purely) leptonic decays of B-mesons have become increasingly important. Due to
the large number of possible distributions in the semi-leptonic decays based on
the quark level transition $b \to s \ell^+ \ell^-$ (not just the branching
ratio), these transitions have become very useful. A study of the
Forward-Backward asymmetries for the inclusive decay ($B \to X_s \ell^+
\ell^-$) is carried out in this paper. This study shall be performed in the SM
and a minimal supersymmetric extensions of the SM, namely the mSUGRA model.


title: Electroweak Precision Data and the Higgs Mass - Workshop Summary

abstract:
  The status of the electroweak precision data as of winter 2003 and the
corresponding theoretical calculations are presented. The possible problems
within the data and the calculations are discussed in a critical way. If the
NuTeV anomaly cannot be explained by unknown effects like higher order parton
distribution functions and if it is not just a statistical fluctuation the
Standard Model of electroweak interactions is in deep problems. Otherwise the
conclusions that the Higgs Boson is relatively light seems quite robust within
the Standard Model.


title: How generic is cosmic string formation in SUSY GUTs

abstract:
  We study cosmic string formation within supersymmetric grand unified
theories. We consider gauge groups having a rank between 4 and 8. We examine
all possible spontaneous symmetry breaking patterns from the GUT down to the
standard model gauge group. Assuming standard hybrid inflation, we select all
the models which can solve the GUT monopole problem, lead to baryogenesis after
inflation and are consistent with proton lifetime measurements. We conclude
that in all acceptable spontaneous symmetry breaking schemes, cosmic string
formation is unavoidable. The strings which form at the end of inflation have a
mass which is proportional to the inflationary scale. Sometimes, a second
network of strings form at a lower scale. Models based on gauge groups which
have rank greater than 6 can lead to more than one inflationary era; they all
end by cosmic string formation.


title: Confinement versus Chiral Symmetry

abstract:
  We construct an effective Lagrangian which illustrates why color deconfines
when chiral symmetry is restored in hot gauge theories with quarks in the
fundamental representation. For quarks in the adjoint representation we show
that while deconfinement and the chiral transition do not need to coincide,
entanglement between them is still present. Extension to the chemical potential
driven transition is discussed.


title: S-wave pi-pi scattering lengths

abstract:
  An old calculation of the s-wave pi-pi scattering lengths is updated and
supplemented with experimental data on the pi-pi s-wave phase shift. The
results ma0 = .215 and ma2 = -.039 are in excellent agreement with those
obtained from a recent analysis of the results published by the Brookhaven E865
collaboration.


title: Nuclear and nucleon transitions of the H di-baryon

abstract:
  We consider 3 types of processes pertinent to the phenomenology of an H
di-baryon: conversion of two $\Lambda$'s in a doubly-strange hypernucleus to an
H, decay of the H to two baryons, and -- if the H is light enough -- conversion
of two nucleons in a nucleus to an H. We compute the spatial wavefunction
overlap using the Isgur-Karl and Bethe-Goldstone wavefunctions, and treat the
weak interactions phenomenologically. The observation of $\Lambda$ decays from
doubly-strange hypernuclei puts a constraint on the H wavefunction which is
plausibly satisfied. In this case the H is very long-lived as we calculate. An
absolutely stable H is not excluded at present. SuperK can provide valuable
limits.


title: Probing the minimal length scale by precision tests of the muon g-2

abstract:
  Modifications of the gyromagnetic moment of electrons and muons due to a
minimal length scale combined with a modified fundamental scale M_f are
explored. Deviations from the theoretical Standard Model value for g-2 are
derived. Constraints for the fundamental scale M_f are given.


title:
The description of pp-interactions with very high multiplicity at 70
  GeV/c by Two Stage Gluon Model

abstract:
  Collective behaviors of secondary particles in pp-interactions at 70 GeV/c
are researched. The Two Stage Gluon Model is supposed for describing of
processes with very high multiplicity. It is shown that gluons play the active
role in the multiparticle dynamics. Analysis of multiplicity distributions of
charged, neutral particles and total multiplicity gives the thermodynamic
meaning of these interactions. The mechanism of the soft photon formation as
signature of the quark-gluon system considered.


title:
Leptoproduction of Vector Mesons at Small $\xbj$ and Generalized Parton
  Distributions

abstract:
  Deep virtual vector meson leptoproduction at small $\xbj$ is analyzed in the
framework of generalized parton distributions. It is shown that the inclusion
of transverse degrees of freedom leads to reasonable agreement with the cross
section data for light mesons.


title: CP asymmetries in neutralino production in e+e- collisions

abstract:
  We study two CP sensitive triple-product asymmetries for neutralino
production e+e- \to\tilde\chi^0_i \tilde\chi^0_j and the subsequent leptonic
two-body decay \tilde\chi^0_i \to \tilde l l, \tilde l \to \tilde\chi^0_1 l,
for \l= e,\mu,\tau. We calculate the asymmetries, cross sections and branching
ratios in the Minimal Supersymmetric Standard Model with complex parameters \mu
and M_1. We present numerical results for the asymmetries to be expected at a
linear electron-positron collider in the 500 GeV range. The asymmetries can go
up to 25 %. We estimate the event rates which are necessary to observe the
asymmetries. Polarized electron and positron beams can significantly enhance
the asymmetries and cross sections. In addition, we show how the two decay
leptons can be distinguished by making use of their energy distributions.


title: Measuring Resonance Parameters of Heavy Higgs Bosons at TESLA

abstract:
  This study investigates the potential of the TESLA Linear Collider for
measuring resonance parameters of Higgs bosons beyond the mass range studied so
far.
  The analysis is based on the reconstruction of events from the Higgsstrahlung
process e+e- -> HZ. It is shown that the total width, the mass and the event
rate for Higgs production can be measured from the mass spectrum in a model
independent fit. Also, the branching ratios to W- and Z-bosons can be measured,
assuming these are the only relevant Higgs decay modes.
  The simulation includes realistic detector effects and all relevant Standard
Model background processes. Results are given for mH=200-320 GeV assuming 500
fb^-1 integrated luminosity at collision energies of 500 GeV.


title: CP asymmetries in neutralino production

abstract:
  We study two CP sensitive triple-product asymmetries for neutralino
production e+e- \to \tilde\chi^0_i \tilde\chi^0_j and the subsequent leptonic
two-body decays \tilde\chi^0_i \to \tilde{l} l of one of the neutralinos and of
the slepton \tilde{l} \to \tilde\chi^0_1 l at an e+e--linear collider with
\sqrt{s} = 500 GeV. We calculate the asymmetries in the Minimal Supersymmetric
Standard Model with complex parameters \mu and M_1. We show that the largest
asymmetries are 10% or 25% and estimate the event rates which are necessary to
measure the asymmetries. Polarized electron and positron beams can
significantly enhance the asymmetries and cross sections. In addition, we show
how the two decay leptons can be distinguished by making use of their energy
distributions.


title: Trying to understand the Standard Model parameters

abstract:
  We stress the importance of the circa 20 parameters in the Standard Model,
which are not fixed by the model but only determined experimentally, as a
window to the physics beyond the Standard Model. However, it is a tiny window
in as far as these numbers contain only the information corresponding to about
one line of text. Looking for a method to study these coupling and mass
parameters, we put forward the idea of the Multiple Point Principle as a first
step. This principle states that Nature adjusts the coupling and mass
parameters so as to make many different vacuum states exist and have
approximately the same energy densities (cosmological constants). As an
illustrative application, we put up the proposal that a small increase (maybe
only an infinitesimal one) in the value of the top quark coupling constant
could lead to a new vacuum phase; in this new phase the binding of a bound
state of 6 top quarks and 6 anti-top quarks becomes so strong as to become a
tachyon and condense in the vacuum. Assuming the existence of a third
degenerate vacuum at the fundamental energy scale, we present a solution to the
hierarchy problem of why the ratio of the fundamental scale to the electroweak
scale is so large. We also present a 5 parameter fit to the orders of magnitude
of the quark-lepton masses and mixing angles in the Family Replicated Gauge
Group Model. In this model, the Standard Model gauge group and a gauged B-L
(baryon number minus lepton number) is extended to one set of gauge fields for
each family of fermions.


title: Electroweak Physics

abstract:
  The results of high precision weak neutral current (WNC), Z-pole, and high
energy collider electroweak experiments have been the primary prediction and
test of electroweak unification. The electroweak program is briefly reviewed
from a historical perspective. Current changes, anomalies, and things to watch
are summarized, and the implications for the standard model and beyond
discussed.


title:
Improved full one-loop corrections to A^0 -> \sf_1 \sf_2 and \sf_2 ->
  \sf_1 A^0

abstract:
  We calculate the full electroweak one-loop corrections to the decay of the
CP-odd Higgs boson A^0 into scalar fermions in the minimal supersymmetric
extension of the Standard Model. For this purpose many parameters of the MSSM
have to be properly renormalized in the on-shell renormalization scheme. We
have also included the SUSY-QCD corrections. For the decay into bottom squarks
and tau sleptons, especially for large \tan\b, the corrections can be very
large making the perturbation expansion unreliable. We solve this problem by an
appropriate definition of the tree-level coupling in terms of running fermion
masses and running trilinear couplings A_f. We also discuss the decay of heavy
scalar fermions into light scalar fermions and A^0. We find that the
corrections can be sizeable and therefore cannot be neglected.


title: Nature of the Chiral Restoration Transition in QCD

abstract:
  As the chirally restored phase ends with T coming down to T_c, a phase
resembling a mixed phase is realized, during which the hadrons (which are
massless at T_c in the chiral limit) get their masses back out of their kinetic
energy. The gluon condensation energy is fed into the system to keep the
temperature (nearly) constant. Lattice results for the gluon condensation are
matched by a Nambu-Jona-Lasinio calculation. The latter shows that below T_c
the chiral symmetry is barely broken, so that with an about 6% drop in the
scalar coupling G it is restored at T_c. Nearly half of the glue, which we call
epoxy, is not melted at T_c.


title: Anomaly Free Gauged $SU(4)_L\times U(1)_X$ Models with Little Higgs

abstract:
  We present an analysis showing how anomaly free fermionic spectra with
consistent embeddings of the Standard Model spectrum under $SU(3)_C\times
SU(2)_L\times U(1)_Y \subset SU(3)_C\times SU(N)_L\times U(1)_X$ for any $N>2$
can be obtained, with special focus on the $N=3 {and} 4$ cases. The
construction is motivated by the little Higgs mechanism. We discuss the
relevancy of the fermionic spectra to the latter, concentrating on two N=4
models, without fermions of exotic charges. Such models hold the promise to
address and solve all the major theoretical as well as phenomenological
problems of the Standard Model at the TeV scale.


title:
Weak decays of the B_c meson to B_s and B mesons in the relativistic
  quark model

abstract:
  Semileptonic and nonleptonic decays of the B_c meson to B_s and B mesons,
caused by the c\to s,d quark transitions, are studied in the framework of the
relativistic quark model. The heavy quark expansion in inverse powers of the
active c and spectator \bar b quark is used to simplify calculations while the
final s and d quarks in the B_s and B mesons are treated relativistically. The
decay form factors are explicitly expressed through the overlap integrals of
the meson wave functions in the whole accessible kinematical range. The
obtained results are compared with the predictions of other approaches.


title: Heavy quarkonium hyperfine structure and leptonic decays

abstract:
  The relation between the hyperfine structure and leptonic decay rates of
heavy quarkonia is considered with the account of relativistic and radiative
corrections. The calculated decay rates agree well with the available
experimental data, while the predicted eta_c(2S) mass is significantly smaller
than the value measured recently by the Belle and BaBar Collaborations.


title: The Lorentz and CPT violating effects on the Z\to l^+ l^- decay

abstract:
  We study the Lorentz and CPT violating effects on the branching ratio BR, the
CPT violating asymmetry A_{CPT} and the ratio of the decay width, including
only the Lorentz violating effects, to the one obtained in the standard model,
for the flavor dependent part of the lepton flavor conserving Z\to l^+ l^-
(l=e,\mu,\tau) decay. The inclusion of the Lorentz and CPT violating effects to
the standard model contribution is too small to be detected, since the
corresponding coefficients are highly suppressed at the low energy scale.


title: New study of the isotensor pi-pi interaction

abstract:
  With t-channel rho, f2(1270) exchange and the pi pi -> rho rho -> pi pi box
diagram contribution, we reproduce the pi pi isotensor S-wave and D-wave
scattering phase shifts and inelasticities up to 2.2 GeV quite well in a
K-matrix formalism. The t-channel rho exchange provides repulsive negative
phase shifts while the t-channel f2(1270) gives an attractive force to increase
the phase shifts for pi pi scattering above 1 GeV, and the coupled-channel box
diagram causes the inelasticities. The implication to the isoscalar pi pi
S-wave interaction is discussed.


title: PYTHIA 6.3 Physics and Manual

abstract:
  The PYTHIA program can be used to generate high-energy-physics `events', i.e.
sets of outgoing particles produced in the interactions between two incoming
particles. The objective is to provide as accurate as possible a representation
of event properties in a wide range of reactions, with emphasis on those where
strong interactions play a role, directly or indirectly, and therefore
multihadronic final states are produced. The physics is then not understood
well enough to give an exact description; instead the program has to be based
on a combination of analytical results and various QCD-based models. This
physics input is summarized here, for areas such as hard subprocesses, initial-
and final-state parton showers, beam remnants and underlying events,
fragmentation and decays, and much more. Furthermore, extensive information is
provided on all program elements: subroutines and functions, switches and
parameters, and particle and process data. This should allow the user to tailor
the generation task to the topics of interest.


title: Strangeness Excitation Function in Heavy Ion Collisions

abstract:
  We study as function of energy strangeness created in relativistic heavy ion
collisions. We consider statistical hadronization with chemical freeze-out in
both equilibrium and nonequilibrium. We obtain strangeness per baryon and per
entropy in the energy range $8.75\lessim\sqrt{s_{NN}}\lessim 200 A$ GeV. A
baryon density independent evaluation of the kaon to pion ratio is presented.


title: Conditions for Confinement and Freeze-Out

abstract:
  Matter implies the existence of a large-scale connected cluster of a uniform
nature. The appearance of such clusters as function of hadron density is
specified by percolation theory. We can therefore formulate the freeze-out of
interacting hadronic matter in terms of the percolation of hadronic clusters.
The resulting freeze-out condition as function of temperature and
baryo-chemical potential interpolates between resonance gas behaviour at low
baryon density and repulsive nucleonic matter at low temperature, and it agrees
well with data.


title: Symmetric Textures in SO(10) and LMA Solution for Solar Neutrinos

abstract:
  A model based on SUSY SO(10) combined with SU(2) family symmetry is
constructed. In contrast with the commonly used effective operator approach,
126-dimensional Higgs fields are utilized to construct the Yukawa sector.
R-parity symmetry is thus preserved at low energies. The symmetric mass
textures arising from the left-right symmetry breaking chain of SO(10) give
rise to very good predictions for quark and lepton masses and mixings. The
prediction for sin(2beta) agrees with the average of current bounds from BaBar
and Belle. In the neutrino sector, our predictions are in good agreement with
results from atmospheric neutrino experiments. Our model accommodates the LMA
solution to the solar neutrino anomaly. The prediction of our model for the
|U(e nu_3)| element in the MNS matrix is close to the sensitivity of current
experiments; thus the validity of our model can be tested in the near future.
We also investigate the correlation between the |U(e nu_3)| element and
tan^{2}(theta_odot) in a general two-zero neutrino mass texture.


title: Sivers Function in the MIT Bag Model

abstract:
  The Sivers function, an asymmetric transverse-momentum distribution of the
quarks in a transversely polarized nucleon, is calculated in the MIT bag model.
The bag quark wave functions contain both $S$-wave and $P$-wave components, and
their interference leads to nonvanishing Sivers function in the presence of the
final state interactions. We approximate these interactions through one-gluon
exchange. An estimate of another transverse momentum dependent distribution
$h_1^\perp$ is also performed in the same model.


title: F-term Inflation and Leptogenesis with 5D SO(10)

abstract:
  We discuss a five dimensional inflationary scenario based on a supersymmetric
SO(10) model compactified on $S^1/(Z_2\times Z_2')$. Inflation is implemented
through scalar potentials on four dimensional branes, and a brane-localized
Einstein-Hilbert term is essential to make both brane vacuum energies positive
during inflation. The orbifold boundary conditions break the SO(10) gauge
symmetry to $SU(4)_c\times SU(2)_L\times SU(2)_R$ ($\equiv H$). The
inflationary scenario yields $\delta T/T\propto (M/M_{\rm Planck})^2$, which
fixes $M$, the symmetry breaking scale of $H$ to be close to the SUSY GUT scale
of $10^{16}$ GeV. The scalar spectral index $n$ is $0.98-0.99$, and the tensor
to scalar ratio $r$ is $\lapproxeq 10^{-4}$. The inflaton decay into the
lightest right handed neutrinos yields the observed baryon asymmetry via
leptogenesis.


title: mSUGRA At A 500-GeV Linear Collider

abstract:
  A study is made of what SUSY signals would be observable for mSUGRA models in
a 500-GeV linear collider. All current experimental bounds on the mSUGRA
parameter space are imposed. For m_0 < 1 TeV (or alternately if the current
g_\mu - 2 anomaly maintains) the only observable signals that remain are
slepton pair production and neutralino production of
{\tilde\chi^0_2}+{\tilde\chi^0_1}. Slepton pair production can occur for masses
< 250 GeV which for the selectron and smuon pairs require tanbeta < 40. In this
domain very accurate selectron and smuon masses could be measured. Light staus,
\tilde\tau_1, with mass < 250 GeV can be pair produced for any tanbeta and the
neutralino signal can be seen provided m_{1/2}<~400 GeV. However, the detection
of these requires a much more complicated analysis due to the fact that the
dark matter co-annihilation constraint requires that the \tilde\tau_1 and
{\tilde\chi^0_1} mass difference be <~ 15 GeV. The point m_{1/2} = 360 GeV, A_0
= 0, \mu>0 is analyzed in detail, and it is shown that the stau and neutralino
signals can be detected provided an active mask down to 2^o is used. However,
large parts of the mSUGRA parameter space exists where a 500-GeV machine would
not be able to see any SUSY signal.


title: Higgsino mass matrix ansatz for MSSM

abstract:
  An ansatz, Det. $M_{\tilde H}=0,$ for the Higgsino mass matrix in string
orbifold trinification is suggested toward the minimal supersymmetric standard
model(MSSM). Small instanton solutions effective around the GUT scale can
fulfil this condition. An argument that the couplings contain a moduli field is
given for a dynamical realization of this Higgsino mass matrix ansatz.


title: CP asymmetries in penguin-induced B decays in general left-right models

abstract:
  We study CP asymmetries in penguin-induced b -> s\bar{s}s decays in general
left-right models without imposing manifest or pseudomanifest left-right
symmetry. Using the effective Hamiltonian approach, we evaluate CP asymmetries
in B^\pm -> \phi K^{(\ast)\pm} decays as well as mixing induced B meson decays
B -> J/\psi K_s and B -> \phi K_s decays. Based on recent measurements
revealing large CP violation, we show that nonmanifest type model is more
favored than manifest or pseudomanifest type.


title:
Pi-pi scattering at low energy: S-wave phase shifts and scattering
  lengths

abstract:
  It is shown that the linear correlation relates the S-wave phase shifts from
the threshold up to dipion mass 900 MeV. By using this correlation at the
solution of the Roy equations, the accuracy of determination of S-wave lengths
is considerably improved. The obtained result unambiguously witnesses in favor
of the standard ChPT version with large quark condensate.


title:
Single-Spin Beam Asymmetry in Semi-Exclusive Deep-Inelastic
  Electroproduction

abstract:
  Recent measurements from Jefferson Lab show significant beam single spin
asymmetries in deep inelastic scattering. The asymmetry is due to interference
of longitudinal and transverse photoabsorption amplitudes which have different
phases induced by the final-state interaction between the struck quark and the
target spectators. We developed a dynamical model for a single-spin beam
asymmetry in deep-inelastic scattering. Our results are consistent with the
experimentally observed magnitude of this effect. We conclude that similar
mechanisms involving quark orbital angular momentum (`Sivers effect') are
responsible for both target and beam single-spin asymmetries.


title: Prompt J/psi production in charged-current deep-inelastic scattering

abstract:
  We calculate the cross section of J/psi inclusive production in
lepton-nucleon deep-inelastic scattering via the weak charged current within
the factorization formalism of nonrelativistic quantum chromodynamics. The
hadronic system produced in association with the J/psi meson can be of
light-quark origin or contain charm. We take into account both direct
production and feed-down from directly-produced heavier charmonia. We provide
the cross sections of all contributing partonic subprocesses in analytic form.
We present theoretical predictions for the J/psi transverse-momentum and
rapidity distributions, which can be measured in current neutrino-nucleon
scattering experiments at CERN and Fermilab, and possibly at the future
electron-proton collider THERA at DESY. We find the cross section to be at the
edge of observability at DESY HERA.


title: On Extracting Heavy Quark Parameters from Moments with Cuts

abstract:
  We point out that applying the photon energy cut significantly modifies the
moments of energy spectrum in B->X_s+gamma decays, with a certain class of
effects not accounted for in the mostly used OPE expressions. This leads to a
systematic bias in the extracted values of the b quark mass and other heavy
quark parameters. The apparent b quark mass increases typically by 70MeV or
more, together with an even more dramatic downward shift in the kinetic
expectation value. Accounting for these cut-related shifts brings different
measurements into a good agreement, when the OPE-based theory employs the
robust approach. These nonperturbative effects are exponential in the effective
hardness severely lowered by high cuts, and do not signify a breakdown of the
1/m_b expansion itself. Similar effects in semileptonic b->c decays are briefly
addressed. We stress the utility of the second moment of E_gamma once these
effects are incorporated.


title: Observation of the Dsj(2463) and Confirmation of the Dsj*(2317)

abstract:
  Using 13.5 inverse-femtobarns of e+e- annihilation data in the CLEO II
detector at CESR, we have observed a new narrow state decaying to Ds*+ pio,
denoted the DsJ(2463). A possible interpretation holds that this is a J^P = 1+^
partner to the DsJ*(2317) state recently discovered by the BaBar Collaboration
which is consistent with J^P = 0^+. We have also confirmed the existence of the
DsJ*(2317) in its decay to Ds+ pio. We have measured the masses of both states,
accounting for the cross-feed background that the two states represent for each
other, and have searched for other decay channels for both states. No narrow
resonances are seen in neutral or doubly charged Ds pi modes.


title:
Corrections to b, t quark masses and $\tau$ lepton mass in SUGRA
  including CP phases

abstract:
  A brief review is given of recent analyses of the effects of CP phases on the
supersymmetric QCD and supersymmetric electroweak contibutions to the $b$ and
$t$ quark masses and to the $\tau$ lepton mass in SUGRA models. The effects of
CP phases on the supersymmetric contributions are found to be significanlty
large for the b quark mass as they can change both its sign and its magnitude.
Thus with the inclusion of CP phases the supersymmetric correction to the b
quark mass can be as much as fifty percent or more of the total b quark mass.
For the case of the $\tau$ lepton, the effects of CP phases on the
supersymmetric correction is also relatively large as it can again affect both
the sign and the magnitude of the $\tau$ mass correction. However, in this case
the overall correction is found to be only a few percent. The effect of CP
phases on SUSY contribution to the $t$ quark mass was also investigated.
However, in this case the overall correction is less than a percent with or
without the inclusion of phases. These results have important implications for
$b-\tau$ unification and for $b-t-\tau$ unification in the context of unified
theories.


title: Neutrino Interferometry In Curved Spacetime

abstract:
  Gravitational lensing introduces the possibility of multiple (macroscopic)
paths from an astrophysical neutrino source to a detector. Such a multiplicity
of paths can allow for quantum mechanical interference to take place that is
qualitatively different to neutrino oscillations in flat space. After an
illustrative example clarifying some under-appreciated subtleties of the phase
calculation, we derive the form of the quantum mechanical phase for a neutrino
mass eigenstate propagating non-radially through a Schwarzschild metric. We
subsequently determine the form of the interference pattern seen at a detector.
We show that the neutrino signal from a supernova could exhibit the
interference effects we discuss were it lensed by an object in a suitable mass
range. We finally conclude, however, that -- given current neutrino detector
technology -- the probability of such lensing occurring for a
(neutrino-detectable) supernova is tiny in the immediate future.


title:
Large Scale Air Shower Simulations and the Search for New Physics at
  AUGER

abstract:
  Large scale airshower simulations around the GZK cutoff are performed. An
extensive analysis of the behaviour of the various subcomponents of the cascade
is presented. We focus our investigation both on the study of total and partial
multiplicities along the entire atmosphere and on the geometrical structure of
the various cascades, in particular on the lateral distributions. The
possibility of detecting new physics in Ultra High Energy Cosmic Rays (UHECR)
at AUGER is also investigated. We try to disentangle effects due to standard
statistical fluctuations in the first proton impact in the shower formation
from the underlying interaction and comment on these points. We argue that
theoretical models predicting large missing energy may have a chance to be
identified, once the calibration errors in the energy measurements are resolved
by the experimental collaborations, in measurements of inclusive
multiplicities.


title: A search for the fourth SM family quarks at Tevatron

abstract:
  It is shown that the fourth standard model (SM) family quarks can be observed
at the Fermilab Tevatron if their anomalous interactions with known quarks have
sufficient strength.


title:
Effective chiral lagrangian in the chiral limit from the instanton
  vacuum

abstract:
  We study the effective chiral Lagrangian in the chiral limit from the
instanton vacuum. Starting from the nonlocal effective chiral action, we derive
the effective chiral Lagrangian, using the derivative expansion to order
$O(p^4)$ in the chiral limit. The low energy constants, $L_1$, $L_2$, and $L_3$
are determined and compared with various models and the corresponding empirical
data. The results are in a good agreement with the data. We also discuss about
the upper limit of the sigma meson, based on the present results.


title:
Symmetry restoration of the soft pion corrections for the light sea
  quark distributions in the small $x$ region

abstract:
  The soft pion correction at high energy may play a crucial role in
non-perturbative parts of sea quark distributions. In this paper, we show that,
while the soft pion correction for the strange sea qaurk distribution is
suppressed in the large and the medium $x$ region compared with that for the up
and the down sea quark one, it can become large and SU(3) flavor symmetric in
the very small $x$ region. This gives us a good reason for the symmetry
restoration of light sea quark distributions required by the mean charge sum
rule for the light sea quarks. Then, by estimating this sum rule with the help
of the results obtained by the soft pion correction, it is argued that there is
a large symmetry restoration of the strange sea quark in the region from
$x=10^{-2}$ to $10^{-6}$ at $Q^2\sim 1$ GeV.


title: Spontaneous baryogenesis in flat directions

abstract:
  We discuss a spontaneous baryogenesis mechanism in flat directions. After
identifying the Nambu-Goldstone mode which derivatively couples to the
associated $U$(1) current and rotates due to the A-term, we show that
spontaneous baryogenesis can be naturally realized in the context of the flat
direction. As applications, we discuss two scenarios of baryogenesis in detail.
One is baryogenesis in a flat direction with a vanishing $B-L$ charge,
especially, with neither baryon nor lepton charge, which was recently proposed
by Chiba and the present authors. The other is a baryogenesis scenario
compatible with a large lepton asymmetry.


title: Curvatons in Supersymmetric Models

abstract:
  We study the curvaton scenario in supersymmetric framework paying particular
attention to the fact that scalar fields are inevitably complex in
supersymmetric theories. If there are more than one scalar fields associated
with the curvaton mechanism, isocurvature (entropy) fluctuations between those
fields in general arise, which may significantly affect the properties of the
cosmic density fluctuations. We examine several candidates for the curvaton in
the supersymmetric framework, such as moduli fields, Affleck-Dine field, $F$-
and $D$-flat directions, and right-handed sneutrino. We estimate how the
isocurvature fluctuations generated in each case affect the cosmic microwave
background angular power spectrum. With the use of the recent observational
result of the WMAP, stringent constraints on the models are derived and, in
particular, it is seen that large fraction of the parameter space is excluded
if the Affleck-Dine field plays the role of the curvaton field. Natural and
well-motivated candidates of the curvaton are also listed.


title: Discriminating among Earth composition models using geo-antineutrinos

abstract:
  It has been estimated that the entire Earth generates heat corresponding to
about 40 TW (equivalent to 10,000 nuclear power plants) which is considered to
originate mainly from the radioactive decay of elements like U, Th and K,
deposited in the crust and mantle of the Earth. Radioactivity of these elements
produce not only heat but also antineutrinos (called geo-antineutrinos) which
can be observed by terrestrial detectors. We investigate the possibility of
discriminating among Earth composition models predicting different total
radiogenic heat generation, by observing such geo-antineutrinos at Kamioka and
Gran Sasso, assuming KamLAND and Borexino (type) detectors, respectively, at
these places. By simulating the future geo-antineutrino data as well as reactor
antineutrino background contributions, we try to establish to which extent we
can discriminate among Earth composition models for given exposures (in units
of kt$\cdot$ yr) at these two sites on our planet. We use also information on
neutrino mixing parameters coming from solar neutrino data as well as KamLAND
reactor antineutrino data, in order to estimate the number of geo-antineutrino
induced events.


title:
Pentaquark Theta+, constituent quark structures, and prediction of
  charmed Theta(c)^0 and bottomed Theta(b)^+

abstract:
  The newly observed $\Theta^+$ resonance is believed to be a pentaquark with
the constituent quarks $uudd\bar s$. There are a few options for the
constituent quark structure. Some advocate diquark-diquark-antiquark
$(ud)$-$(ud)$-$\bar s$ while others favor diquark-triquark $(ud)$-$(ud\bar s)$.
We use the color-spin hyperfine interaction to examine the energy levels of
these structures, and we find that the diquark-diquark-antiquark structure is
slight favored. We proceed to write down the flavor triplet and antisextet of
the charmed or bottomed exotic baryons with internal $qqqq\bar Q$ quarks. We
also estimate the mass of $\Theta_c^0$ and $\Theta_b^+$.


title: Power counting in relativistic baryon chiral perturbation theory

abstract:
  We consider a renormalization scheme for relativistic baryon chiral
perturbation theory which provides a simple and consistent power counting for
renormalized diagrams. As an application we discuss the chiral expansion of the
nucleon mass.


title:
A Kinematically Complete Analysis of the CLAS data on the Proton
  Structure Function $F_2$ in a Regge-Dual model

abstract:
  The recently measured inclusive electron-proton cross section in the nucleon
resonance region, performed with the CLAS detector at the Thomas Jefferson
Laboratory, has provided new data for the nucleon structure function $F_2$ with
previously unavailable precision. In this paper we propose a description of
these experimental data based on a Regge-dual model for $F_2$. The basic inputs
in the model are nonlinear complex Regge trajectories producing both isobar
resonances and a smooth background. The model is tested against the
experimental data, and the $Q^2-$ dependence of the moments is calculated. The
fitted model for the structure function (inclusive cross section) is a limiting
case of the more general scattering amplitude equally applicable to deeply
virtual Compton scattering (DVCS). The connection between the two is discussed.


title: Exclusive electroproduction of J/psi mesons

abstract:
  A nonperturbative calculation of elastic electroproduction of the J/psi meson
is presented and compared to the experimental data.
  Our model describes well the observed dependences of the cross sections on
the photon virtuality Q2 and on the energy, and the measured ratio R of
longitudinal to transverse cross sections.


title: Phenomenology of New Physics

abstract:
  I review the phenomenology of new physics in low energy processes using the
notion of minimal flavor violation (vs. non-minimal flavor violation). I
compare the predictions of beyond-the-standard models and show that among
certain observables in rare $b$-decays pattern arise, which allow to
distinguish between extensions of the Standard Model. I discuss the status and
future of the model independent analysis of $b \to s$ processes.


title: Quark-Antiquark Exchange in $\gamma^* \gamma^*$ Scattering

abstract:
  We calculate the high energy behavior of quark-antiquark exchange in
$\gamma^* \gamma^*$ elastic scattering by summing, to all orders, the leading
double logarithmic contributions of the QCD ladder diagrams. Motivation comes
from the LEP data for $\sigma_{tot}^{\gamma^* \gamma^*}$ which indicate the
need for secondary reggeon exchange. We show that, for large photon
virtualities, this exchange is calculable in pQCD. This applies, in particular,
to parts of the LEP kinematic region.


title: Duality in the Color Flavor Locked Spectrum

abstract:
  We analyze the spectrum of the massive states for the color flavor locked
phase (CFL) of QCD. We show that the vector mesons have a mass of the order of
the color superconductive gap $\Delta$. We also see that the excitations
associated with the solitonic sector of the CFL low energy theory have a mass
proportional to $F^2_{\pi}/\Delta$ and hence are expected to play no role for
the physics of the CFL phase for large chemical potential. Another interesting
point is that the product of the soliton mass and the vector meson mass is
independent of the gap. We interpret this behavior as a form of electromagnetic
duality in the sense of Montonen and Olive. Our approach for determining the
properties of the massive states is non-perturbative in nature and can be
applied to any theory with multiple scales.


title: Aspects of Diffraction at the Tevatron

abstract:
  Results on soft and hard diffraction obtained by the CDF Collaboration at the
Fermilab Tevatron proton-antiproton Collider are reviewed with emphasis on
aspects of the data that point to the underlying QCD mechanism for diffraction.
The results are interpreted in terms of a phenomenological approach in which
diffraction is due to an exchange of low-x partons subject to color
constraints.


title:
Topological Defect Density in One-Dimensional Friedmann-Robertson-Walker
  Cosmological Model: Corrections Inferred from the
  Multi-Josephson-Junction-Loop Experiment

abstract:
  The data on a strongly-nonequilibrium superconducting phase transition in the
multi-Josephson-junction loop (MJJL), which represents a close analog of
one-dimensional Friedmann-Robertson-Walker cosmological model, are used to
refine a concentration of topological defects after the phase transitions of
Higgs fields in the early Universe. The thermal correlations between the phases
of order parameter revealed in MJJL can reduce considerably the expected number
of cosmological defects and, thereby, show a new way to resolve the
long-standing problem of their excessive concentration.


title:
Theoretical Introduction to B Decays and the Soft-Collinear Effective
  Theory

abstract:
  In this talk I give an introduction to methods used to give a model
independent description of QCD effects in B-decays. I discuss three useful
expansions: mb/mW << 1 for the electroweak Hamiltonian, LambdaQCD/mb << 1 for
Heavy Quark Effective theory, and LambdaQCD/Q << 1 for the Soft-Collinear
Effective Theory where Q ~ mb is the large energy of light final state hadrons.
I discuss predictions that can be made with each expansion.


title: Components of Antineutrino Emission in Nuclear Reactor

abstract:
  New ${\bar{\nu}_e},e$ scattering experiments aimed for sensitive searches of
the ${\nu}_e$ magnetic moment and projects to explore small mixing angle
oscillations at reactors call for a better understanding of the reactor
antineutrino spectrum. Here we consider six components, which contribute to the
total ${\bar{\nu}_e}$ spectrum generated in nuclear reactor. They are: beta
decay of the fission fragments of $^{235}$U, $^{239}$Pu, $^{238}$U and
$^{241}$Pu, decay of beta-emitters produced as a result of neutron capture in
$^{238}$U and also due to neutron capture in accumulated fission fragments
which perturbs the spectrum. For antineutrino energies less than 3.5 MeV we
tabulate evolution of ${\bar{\nu}_e}$ spectra corresponding to each of the four
fissile isotopes vs fuel irradiation time and their decay after the irradiation
is stopped and also estimate relevant uncertainties. Small corrections to the
ILL spectra are considered.


title:
Neutrino Masses in 5D Orbifold SU(5) Unification Models without
  Right-handed Singlets

abstract:
  We explore a mechanism for radiatively generating neutrino Majorana masses in
a 5 dimensional orbifold SU(5) unification model without introducing
right-handed singlets. The model is non-supersymmetric and the extra dimension
is compactified via a $s_1/(Z_2\times Z'_2)$ orbifold geometry. The necessary
lepton number violating interaction arises from the Yukawa interactions either
between a 10-plet or a 15-plet bulk scalar field and the fermion quintuplets
which are residents on the SU(5) symmetrical brane located at one of the
orbifold fixed points. The model is engineered to give realistic charged
fermion masses and mixing and in the same time avoiding the rapid proton and
neutron decays by geometric construction. The gauge unification can be
maintained by adding extra fermion or scalar fields. The unification scale is
found to be larger then $10^{15}$ GeV by adding a bulk vector decuplet pair
whose zero mode has masses around $10\sim 100$ TeV range. We found that
neutrino mass matrix of the normal hierarchy type is favored by using 15-plet
scalar. We give a solution of this type which has detectable $\mu\ra 3e$
transition. On the other hand, by introducing 10-plet scalar, the leading
neutrino mass matrix can only be inverted hierarchical and gives at most
bi-maximal mixing.


title: Mixed high energy neutrinos from cosmos

abstract:
  Production of the expected high energy neutrino flux with energy greater than
tens of thousands of GeV in some astrophysical sites such as the galactic plane
as well as the centers of some distant galaxies is reviewed. The expected
changes in these neutrino fluxes because of neutrino oscillations during their
propagation to us are described. Observational signatures for these neutrino
fluxes with and without neutrino oscillations are discussed.


title:
Leading twist coherent diffraction on nuclei in deep inelastic
  scattering at small x and nuclear shadowing

abstract:
  We extend the theory of leading twist nuclear shadowing to calculate leading
twist nuclear diffractive parton distribution functions (nDPDFs). We observe
that the quark and gluon nPDFs have different patterns of the $A$-dependence.
  It is found that the probability of diffraction in the quark channel
increases with $A$, reaching about 30% at $x \sim 10^{-4}$ for $A \sim 200$,
and weakly decreases with $Q^2$. In the gluon channel, the probability of
diffraction is large for all nuclei ($\sim 40$% for heavy nuclei at $x \sim
10^{-4}$ and $Q_0^2 \sim 4$ GeV$^2$), it weakly depends on $A$ and it decreases
rather fast with increasing $Q^2$ -- the probability decreases by approximately
a factor of two as $Q^2$ changes from 4 GeV$^2$ to 100 GeV$^2$. We also find
that nuclear shadowing breaks down Regge factorization of nDPDFs, which is
satisfied experimentally in the nucleon case. All these novel effects in nDPDFs
are large enough to be straightforwardly measured in ultraperipheral collisions
at the LHC.


title: Massive photons in particle and laser physics

abstract:
  The massive electrodynamics is applied to the Dirac equation to find the
generalized Volkov solution with massive photon field. The resulting equation
is the Riccati equation which cannot be solved in general. We use the
approximative Volkov function for massive photons and then consider an electron
in the periodic field and in the laser pulse of the delta-function form. We
derive the modified Compton formulas for the interaction of the multiphoton
object with an electron for both cases.


title:
Chiral dynamics and the growth of the nucleon's gluonic transverse size
  at small x

abstract:
  We study the distribution of gluons in transverse space in the nucleon at
moderately small x (~10^{-2}). At large transverse distances (impact
parameters) the gluon density is generated by the 'pion cloud' of the nucleon,
and can be calculated in terms of the gluon density in the pion. We investigate
the large-distance behavior in two different approaches to chiral dynamics: i)
phenomenological soft-pion exchange, ii) the large-N_c picture of the nucleon
as a classical soliton of the pion field, which corresponds to degenerate N and
Delta states. The large-distance contributions from the 'pion cloud' cause a
\~20% increase in the overall transverse size of the nucleon if x drops
significantly below M_pi/M_N. This is in qualitative agreement with the
observed increase of the slope of the t-dependence of the J/psi photoproduction
cross section at HERA compared to fixed-target energies. We argue that the glue
in the pion cloud could be probed directly in hard electroproduction processes
accompanied by 'pion knockout', gamma^* + N -> gamma (or rho, J/psi) + pi + N',
where the transverse momentum of the emitted pion is large while that of the
outgoing nucleon is restricted to values of order M_pi.


title: Entropy for Colored Quark States at Finite Temperature

abstract:
  The quantum entropy at finite temperatures is analyzed by using models for
colored quarks making up the physical states of the hadrons. We explicitly work
out some special models for the structure of the states of SU(2) and SU(3)
relating to the effects of the temperature on the quantum entropy. We show that
the entropy of the singlet states monotonically decreases meaning that the
mixing of these states continually diminishes with the temperature. It has been
found that the structure of the octet states is more complex so that it can be
best characterized by two parts. One part is very similar to that of the
singlet states. The other one reflects the existence of strong correlations
between two of the three color states. Furthermore, we work out the entropy for
the {\it classical} Ising and the {\it quantum} XY spin chains. In Ising model
the quantum (ground state) entropy does not directly enter into the canonical
partition function. It also does not depend on the number of spatial
dimensions, but only on the number of quantum states making up the ground
state. Whereas, the XY spin chain has a finite entropy at vanishing
temperature. The results from the spin models qualitatively analogous to our
models for the states of SU(2) and SU(3).

categories: hep-ph cond-mat.stat-mech nucl-th physics.comp-ph quant-ph


title:
Learning about the chiral structure of the proton from the hyperfine
  splitting

abstract:
  The complete analytical $O(m_l^3\alpha^5/m_p^2\times (\log{m_\pi},
\log{\Delta}, \log{m_l}))$ contribution to the Hyperfine splitting is given. It
can explain about 2/3 of the difference between experiment and the pure QED
prediction when setting the renormalization scale at the $\rho$ mass. The
suppression of the polarizability piece with respect the Zemach one seems to
be, to a large extent, a numerical accident. We give an estimate of the
matching coefficient of the spin-dependent proton-lepton operator in heavy
baryon effective theory.


title: Feynman rules for the strong and $\Delta S =1$ weak chiral Lagrangian

abstract:
  We present Feynman rules for the strong and $\Delta S = 1$ weak chiral
Lagrangian which are relevant for calculating $K\to \pi\pi\pi$ decay
amplitudes. Feynman rules for this specific case turn out to be too lengthy to
be included in a research paper. Since they are not standard, we decide to
include them in a separate article, making them available for any one who is
interested in this kind of calculation. Any found mistakes and (/or) comments
are warmly welcome so that corrections can be made.


title:
Next-to-leading order QCD predictions for W+2j and Z+2j production at
  the CERN LHC

abstract:
  We present cross sections and differential distributions for QCD radiative
corrections to the QCD processes pp -> W+2j and pp -> Z+2j at the CERN LHC.
Calculations are performed with the Monte Carlo program MCFM. Cross section
dependence on the renormalization and factorization scales is greatly reduced,
except for the heavy-flavor case of Wbb~, which has new features at
next-to-leading order at the LHC. We also present cross sections for Wbb~ and
Z+2j in kinematic configurations relevant for Higgs boson searches.


title: Phenomenology of low-scale supersymmetry breaking models

abstract:
  In this letter we consider the distinctive phenomenology of supersymmetric
models in which the scale of SUSY breaking is very low, \sqrt{F}= O(TeV),
focusing on the Higgs sector and the process of electroweak breaking. Using an
effective Lagrangian description of the interactions between the observable
fields and the SUSY breaking sector, it is shown how the conventional MSSM
picture can be substantially modified. For instance, the Higgs potential has
non-negligible SUSY breaking quartic couplings that can modify completely the
pattern of electroweak breaking and the Higgs spectrum with respect to that of
conventional MSSM-like models.


title:
Minimal SUSY SO(10) model and predictions for neutrino mixings and
  leptonic CP violation

abstract:
  We discuss a minimal Supersymmetric SO(10) model where B-L symmetry is broken
by a {\bf 126} dimensional Higgs multiplet which also contributes to fermion
masses in conjunction with a {\bf 10} dimensional superfield. This minimal
Higgs choice provides a partial unification of neutrino flavor structure with
that of quarks and has been shown to predict all three neutrino mixing angles
and the solar mass splitting in agreement with observations, provided one uses
the type II seesaw formula for neutrino masses. In this paper we generalize
this analysis to include arbitrary CP phases in couplings and vevs. We find
that (i) the predictions for neutrino mixings are similar with $U_{e3}\simeq
0.18$ as before and other parameters in a somewhat bigger range and (ii) that
to first order in the quark mixing parameter $\lambda$ (the Cabibbo angle), the
leptonic mixing matrix is CP conserving. We also find that in the absence of
any higher dimensional contributions to fermion masses, the CKM phase is
different from that of the standard model implying that there must be new
contributions to quark CP violation from the supersymmetry breaking sector.
Inclusion of higher dimensional terms however allows the standard model CKM
phase to be maintained.


title: CP Violation in the 3 Jet and 4 Jet Decays of the Z Boson at GigaZ

abstract:
  We review CP-violating effects in Z --> 3 jet and Z --> 4 jet decays,
assuming the presence of CP-violating effective Z b bbar G and Z b bbar G G
couplings. Longitudinal beam polarization is included in the studies. We
propose a direct search for such CP-violating couplings by using various CP-odd
observables. The data of a future linear collider running at the Z-resonance in
the so-called GigaZ option should give significant information on the
couplings. Finally we show that stringent bounds on the mass of excited b
quarks can be derived if appropriate couplings are of a size characteristic of
a strong interaction.


title: TeV Symmetry and the Little Hierarchy Problem

abstract:
  Constraints from precision electroweak measurements reveal no evidence for
new physics up to 5 - 7 TeV, whereas naturalness requires new particles at
around 1 TeV to address the stability of the electroweak scale. We show that
this "little hierarchy problem" can be cured by introducing a symmetry for new
particles at the TeV scale. As an example, we construct a little Higgs model
with this new symmetry, dubbed T-parity, which naturally solves the little
hierarchy problem and, at the same time, stabilize the electroweak scale up to
10 TeV. The model has many important phenomenological consequences, including
consistency with the precision data without any fine-tuning, a stable
weakly-interacting particle as the dark matter candidate, as well as collider
signals completely different from existing little Higgs models, but rather
similar to the supersymmetric theories with conserved R-parity.


title:
CP conserved nonleptonic $K \to \pi \pi \pi $ decays in the Chiral Quark
  Model

abstract:
  The CP conserved non leptonic $K\to \pi \pi \pi$ decays are discussed within
the chiral quark model, including chiral perturbation theory corrections. All
amplitudes are parameterized in terms of quark and gluon condensate and the
constituent quark mass. The same values for these parameters that can be
obtained by a fit of the $\Delta I = 1/2$ rule in $K\to 2 \pi$ give a
reasonably good fit in the $K\to 3 \pi$ case. We compare with the work of other
groups.


title: SuperWIMPs in Supergravity

abstract:
  In supergravity theories, a natural possibility is that neutralinos or
sleptons freeze out at their thermal relic density, but then decay to
gravitinos after about a year. The resulting gravitinos are then superWIMPs --
superweakly-interacting massive particles that naturally inherit the desired
relic density from late decays of conventional WIMPs. SuperWIMP dark matter
escapes all conventional searches. However, the late decays that produce
superWIMPs provide new and promising early universe signatures for cold dark
matter.


title: Cosmological gravitino problem confronts electroweak physics

abstract:
  A generic feature of gauge-mediated supersymmetry breaking models is that the
gravitino is the lightest supersymmetric particle (LSP). In order not to
overclose the universe, the gravitino LSP should be light enough (~ 1 keV), or
appropriately heavy (~ 1 GeV). We study further constraints on the mass of the
gravitino imposed by electroweak experiments, i.e., muon g-2 measurements,
electroweak precision measurements, and direct searches for supersymmetric
particles at LEP2. We find that the heavy gravitino is strongly disfavored from
the lower mass bound on the next-to-LSP. The sufficiently light gravitino, on
the other hand, has rather sizable allowed regions in the model parameter
space.


title:
Full ${\cal O}(\alpha_{ew})$ electroweak corrections to $e^+e^- \to H H
  Z$

abstract:
  We calculate the full ${\cal O}(\alpha_{ew})$ electroweak corrections to the
Higgs pair production process $e^+ e^- \to H H Z$ at an electron-positron
linear collider in the standard model, and analyze the dependence of the Born
cross section and the corrected cross section on the Higgs boson mass $m_H$ and
the c.m. energy $\sqrt{s}$. To see the origin of some of the large corrections
clearly, we calculate the QED and genuine weak corrections separately. The
numerical results show that the corrections significantly suppress or enhance
the Born cross section, depending on the values of $m_H$ and $\sqrt{s}$. For
the c.m. energy $\sqrt{s} = 500 GeV$, which is the most favorable colliding
energy for $H H Z$ production with intermediate Higgs boson mass, the relative
correction decreases from -5.3% to -11.5% as $m_H$ increases from 100 to 150
GeV. For the range of the c.m. energy where the cross section is relatively
large, the genuine weak relative correction is small, less than 5%.


title: High Order QED Corrections in Physics of Positronium

abstract:
  High-order perturbative corrections to positronium decays and hyperfine
splitting are briefly reviewed. Theoretical predictions are compared to the
most recent experimental data. Perspectives of future calculations are
discussed.


title:
Understanding the Possible Proton Antiproton Bound State Observed by BES
  Collaboration

abstract:
  We comment on the quantum numbers and decay channels of the possible proton
antiproton bound state observed by BES Collaboration. Based on the general
symmetry consideration and available experimental information, we conclude that
the quantum number of this state is very likely to be $J^{PC}=0^{-+}, I^G=0^+$,
which can not decay into final states $\pi^+\pi^-, 2\pi^0, K{\bar K}, 3\pi$.
Besides its dissociation into $p\bar p$, the other important mesonic decay
modes could be $\eta \pi\pi$, $\eta'\pi\pi$, $\eta\eta\eta$, $4\pi$, $K{\bar
K}\pi$, $\eta K{\bar K}$, $K\bar K \pi\pi$, 6$\pi$. Experimental search of this
signal in these meson final states is strongly called for.


title: Double Beta Decay and the Absolute Neutrino Mass Scale

abstract:
  After a short review of the current status of three-neutrino mixing, the
implications for the values of neutrino masses are discussed. The bounds on the
absolute scale of neutrino masses from Tritium beta-decay and cosmological data
are reviewed. Finally, we discuss the implications of three-neutrino mixing for
neutrinoless double-beta decay.


title: Harmonic quarks: properties and some applications

abstract:
  In this work the investigation of hadronic structures with the help of the
harmonic quarks is prolonged. The harmonic quark model is good at describing
the meson structures and the baryon excitations to resonances, in particular
delta(1232). Harmonic quark reactions form the structure of the baryon
resonances. Presumed quark structures of the mesons eta(548), omega(772),
a(980) and f(980) are given. It became clear that the some hadronic structures
contain the filled quark shells. The kinetic quark energy in the basic charged
mesons are enough small for a using of perturbative methods. The following
topics are briefly considered and discussed: harmonic quark series and its
boundaries, the d-quark peculiarity, parallel quark series and quark mixing.
The boundaries of quark chain can are closely related to a weak interaction.
The cause of the quark mixing is probably an existence of the parallel quark
chain and the special properties of the d-quark in the main quark chain. The
new mass equation is found. It is probably a manifestation of Higgs mechanism.
Using this equality enables to improve the accuracy of the harmonic quark
masses calculation to 0.005%. The strong interaction should take into account
the harmonic quark annihilation.


title: Apparent Lorentz violation through spacetime-varying couplings

abstract:
  In this talk, we explore the relation between smoothly varying couplings and
Lorentz violation. Within the context of a supergravity model, we present an
explicit mechanism that causes the effective fine-structure parameter and the
effective electromagnetic $\theta$ angle to acquire related spacetime
dependences. We argue that this leads to potentially observable Lorentz
violation and discuss some implications for the Standard-Model Extension.


title:
Monte-Carlo Simulation of Exclusive Channels in e+e- Annihilation at Low
  Energy

abstract:
  Software package for Monte-Carlo simulation of e+e- exclusive annihilation
channels written in the C++ language for Linux/Solaris platforms has been
developed. It incorporates matrix elements for several mechanisms of multipion
production in a model of consequent two and three-body resonance decays.
Possible charge states of intermediate and final particles are accounted
automatically under the assumption of isospin conservation. Interference
effects can be taken into acccount. Package structure allows adding new matrix
elements written in a gauge-invariant form.


title:
Effects of SUSY-QCD in hadronic Higgs production at
  next-to-next-to-leading order

abstract:
  An estimate of the NNLO supersymmetric QCD effects for Higgs production at
hadron colliders is given. Assuming an effective gluon-Higgs interaction, these
corrections enter only in terms of process-independent, factorizable terms. We
argue that the current knowledge of these terms up to NLO is sufficient to
derive the NNLO hadronic cross section within the limitations of the standard
theoretical uncertainties arising mainly from renormalization and factorization
scale variations. The SUSY contributions are small with respect to the QCD
effects, which means that the NNLO corrections to Higgs production are very
similar in the Standard Model and the MSSM.


title: Absence of isentropic expansion in various inflation models

abstract:
  Dynamics of the inflaton is studied when it interacts with boson and fermion
fields and in minimal supersymmetric models. This encompasses multifield
inflation models, such as hybrid inflation, and typical reheating models. For
much of the parameter space conducive to inflation, the inflaton is found to
dissipate adequate radiation to have observational effects on density
perturbations and in cases to significantly affect inflaton evolution. Thus,
for many inflation models, believed to yield exclusively isentropic inflation,
the parameter space now divides into regimes of isentropic and nonisentropic
inflation.


title:
Chiral fermion mass and dispersion relations at finite temperature in
  the presence of hypermagnetic fields

abstract:
  We study the modifications to the real part of the thermal self-energy for
chiral fermions in the presence of a constant external hypermagnetic field. We
compute the dispersion relation for fermions occupying a given Landau level to
first order in g'^2, g^2 and g_phi^2 and to all orders in g'B, where g' and g
are the U(1)_Y and SU(2)_L couplings of the standard model, respectively, g_phi
is the fermion Yukawa coupling, and B is the hypermagnetic field strength. We
show that in the limit where the temperature is large compared to sqrt{g'B},
left- and right-handed modes acquire finite and different B-dependent masses
due to the chiral nature of their coupling with the external field. Given the
current bounds on the strength of primordial magnetic fields, we argue that the
above is the relevant scenario to study the effects of magnetic fields on the
propagation of fermions prior and during the electroweak phase transition.