title: Thermal gluo-magnetic vacuum of SU(N) gauge theory

abstract:
  The magnetic sector of SU(N) Yang-Mills theory at finite temperature is
studied. At low temperatures, T<2T_c, the analytic expressions for the
temperature dependence of the magnetic correlator, of the magnetic gluon
condensate and of the spatial string tension are obtained. Fair agreement with
lattice calculations for spatial string tension is obtained for SU(2) and SU(3)
gauge theories. The relative contribution given by non-zero Matsubara modes to
the spatial string tension is calculated. At T=2T_c this contribution is of the
order of 5%. The behavior of magnetic correlator at high temperatures is
investigated and it is shown that gluo-magnetic condensate increases with
temperature as <H^2>(T)= const g^8(T) T^4.


title:
Ground State Masses and Biding Energies of the Nucleon, Hyperon and
  Heavy Baryons in a Light-Front Model

abstract:
  The ground state masses and binding energies of the nucleon,
  $\Lambda^0$, $\Lambda^+_c$, $\Lambda^0_b$ are studied within a constituent
quark QCD-inspired light-front model. The light-front Faddeev equations for the
$Qqq$ composite spin 1/2 baryons, are derived and solved numerically. The
experimental data for the masses are qualitatively described by a flavor
independent effective interaction.


title:
Covariant derivative expansion of Yang-Mills effective action at high
  temperatures

abstract:
  Integrating out fast varying quantum fluctuations about Yang--Mills fields
A_i and A_4, we arrive at the effective action for those fields at high
temperatures. Assuming that the fields A_i and A_4 are slowly varying but that
the amplitude of A_4 is arbitrary, we find a non-trivial effective gauge
invariant action both in the electric and magnetic sectors. Our results can be
used for studying correlation functions at high temperatures beyond the
dimensional reduction approximation, as well as for estimating quantum weights
of classical static configurations such as dyons.


title: WMAPing out Supersymmetric Dark Matter and Phenomenology

abstract:
  The recent WMAP data provide a rather restricted range of the Cold Dark
Matter (CDM) density $ \Omega_{CDM} h^2 $ of unprecedented accuracy. We combine
these new data along with data from BNL E821 experiment measuring $
{(g_{\mu}-2)}$, $ $the {$b\goes s \gamma$} branching ratio and the light Higgs
boson mass bound from LEP, to update our analysis of the allowed boundaries in
the parameter space of the Constrained Minimal Supersymmetric Standard Model
(CMSSM). The prospects of measuring Supersymmetry at LHC look like a very safe
bet, and the potential of discovering SUSY particles at a $ \sqrt{s} = 1.1
\mathrm{TeV} $ linear collider is enhanced considerably. The implications for
Dark Matter direct searches are also discussed.


title: Pion broadening and low-mass dilepton production

abstract:
  We determine mass and transverse momentum spectra of dileptons produced in
Pb+Au (158 GeV/u) collisions within a pion annihilation model.
  A fit to the data requires simultaneous mass reduction and broadening of the
in-medium rho propagator.
  The introduction of a finite pion width, as required within self-consistent
approaches to the interacting pion gas, further improves the agreement with the
data.


title: Hybridized Affleck-Dine baryogenesis

abstract:
  We propose a novel scenario for Affleck-Dine baryogenesis in the braneworld,
considering the hybrid potential for the Affleck-Dine field. Destabilization of
the flat direction is not due to the Hubble parameter, but is induced by a
trigger field. The moduli for the brane distance plays the role of the trigger
field. Q-balls are unstable in models with large extra dimensions.


title: QCD Sum Rules and the Determination of Fundamental Parameters

abstract:
  We present a new QCD sum rule with high sensitivity to the continuum regions
of charm and bottom quark pair production. Combining this sum rule with
existing ones yields very stable results for the msbar quark masses, m_c(m_c)$
and m_b (m_b). Comparison of our approach with experimental data allows for a
robust theoretical error estimate. We have also provided a new evaluation of
the lifetime of the tau lepton, serving as a strong constraint on alpha_s.


title:
Hydrodynamic Evolution of Spherical Fireball In Relativistic Heavy Ion
  Collisions

abstract:
  Evolution process could be calculated from the relativistic hydrodynamic
equation with certain estimated initial conditions about a single spherical
fireball here. So one could estimate a kind of initial condition qualitatively
with a possible energy density about $\epsilon_0\approx 1.9$ $GeV/fm^3$, based
on this process to fit the experimental data at thermal freeze-out. The
evolution from a cylindrical fireball will be discussed simply in a later
chapter.


title:
Higgs pair production due to a radion resonance in Randall-Sundrum
  model: prospects at the Large Hadron Collider

abstract:
  We consider Higgs pair production at the Large Hadron Collider (LHC) in a
Randall-Sundrum scenario containing a radion field. It is shown that the
enhanced effective coupling of the radion to gluons, together with
contributions from a low-lying radion pole, can provide larger event rates
compared to most new physics possibilities considered so far. We present the
results for both an intermediate mass Higgs and a heavy Higgs, with a detailed
discussion of the background elimination procedure.


title:
On Effective Degrees of Freedom at Chiral Restoration and the Vector
  Manifestation

abstract:
  Recent research activities on the chiral structure of hadronic matter near
the phase transition predicted by QCD and extensively looked for in terrestrial
laboratories as well as in satellite observatories raise the issue of whether
we have fully identified the relevant degrees of freedom involved in the
transition. In this talk, I would like to discuss a recent novel approach to
the issue based on the "vector manifestation" scenario discovered by Harada and
Yamawaki in hidden local symmetry theory. For simplicity, I will restrict
myself to two extreme scenarios: one that we shall refer to as "standard" in
which pions are considered to be the $only$ low-lying degrees of freedom and
the other that could be referred to as "non-standard" in which in addition to
pions, other degrees of freedom figure in the process. In particular, I shall
consider the scenario that arises at one-loop order in chiral perturbation
theory with hidden local symmetry Lagrangian consisting of pions as well as
nearly massless vector mesons that figure importantly at the ``vector
manifestation (VM)" fixed point. It will be shown that if the VM is realized in
nature, the chiral phase structure of hadronic matter can be much richer than
that in the standard one and the chiral phase transition will be a smooth
crossover: Sharp vector and scalar excitations are expected in the vicinity of
the critical point. Some indirect indications that lend support to the VM
scenario are discussed.


title: Transverse momentum fluctuations and percolation of strings

abstract:
  The behaviour of the transverse momentum fluctuations with the centrality of
the collision shown by the Relativistic Heavy Ion Collider data is naturally
explained by the clustering of color sources. In this framework, elementary
color sources --strings-- overlap forming clusters, so the number of effective
sources is modified. These clusters decay into particles with mean transverse
momentum that depends on the number of elementary sources that conform each
cluster, and the area occupied by the cluster. The transverse momentum
fluctuations in this approach correspond to the fluctuations of the transverse
momentum of these clusters, and they behave essentially as the number of
effective sources.


title: On photoexcitation of baryon antidecuplet

abstract:
  We show that the photoexcitation of the baryon antidecuplet, suggested by the
soliton classification of low-lying baryons, is strongly suppressed on the
proton target. The process occurs mostly on the neutron target. This
qualitative prediction can be useful in identifying the non-exotic members of
the antidecuplet in the known baryon spectrum. We also analyze the
interrelation between photocouplings of various baryon multiplets in the
soliton picture and in the nonrelativistic quark model.


title: Constituent-Quark Model and New Particles

abstract:
  An elementary constituent-quark (CQ) model by Mac Gregor is reviewed with
currently published data from light meson spectroscopy. It was previously shown
in the CQ model that there existed several mass quanta m = 70 MeV, B = 140 MeV
and X = 420 MeV, which were responsible for the quantization of meson yrast
levels. The existence of a 70-MeV quantum was postulated by Mac Gregor and was
shown to fit the Nambu empirical mass formula mn = (n/2)137me, n a positive
integer. The 70-MeV quantum can be derived in three different ways: 1) pure
electric coupling, 2) pure magnetic coupling, and 3) mixed electric and
magnetic charges (dyons). Schwinger first introduced dyons in a magnetic model
of matter. It is shown in this paper that recent data of new light mesons fit
into the CQ model (a pure electric model) without the introduction of magnetic
charges. However, by introducing electric and magnetic quarks (dyons) into the
CQ model, new dynamical forces can be generated by the presence of magnetic
fields internal to the quarks (dyons). The laws of angular momentum and of
energy conservation are valid in the presence of magnetic charge. With the
introduction of the Russell-Saunders coupling scheme into the CQ model, several
new meson particles are predicted to exist. The existence of the f0(560) meson
is predicted and is shown to fit current experimental data from the Particle
Data Group listing. The existence of meson partners or groupings is shown.


title: Higher twists in the pion structure function

abstract:
  We calculate the QCD moments of the pion structure function using Drell-Yan
data on the quark distributions in the pion and a phenomenological model for
the resonance region. The extracted higher twist corrections are found to be
larger than those for the nucleon, contributing around 50% of the lowest moment
at Q^2=1 GeV^2.


title: In-medium Yang-Mills equations: a derivation and canonical quantization

abstract:
  The equations for Yang-Mills field in a medium are derived in a linear
approximation with respect to the gauge coupling parameter and the external
field. The obtained equations closely resemble the macroscopic Maxwell
equations. A canonical quantization is performed for a family of Fermi-like
gauges in the case of constant and diagonal (in the group indices) tensors of
electric permittivity and magnetic permeability. The physical subspace is
defined and the gauge field propagator is evaluated for a particular choice of
the gauge. The propagator is applied for evaluation of the cross-section of
ellastic quark scattering in the Born approximation. Possible applications to
Cherenkov-type gluon radiation are commented briefly.


title: Nucleon-Nucleon Scattering under Spin-Isospin Reversal in Large-N_c QCD

abstract:
  The spin-flavor structure of certain nucleon-nucleon scattering observables
derived from the large N_c limit of QCD in the kinematical regime where
time-dependent mean-field theory is valid is discussed. In previous work, this
regime was taken to be where the external momentum was of order N_c which
precluded the study of differential cross sections in elastic scattering. Here
it is shown that the regime extends down to order N_c^{1/2} which includes the
higher end of the elastic regime. The prediction is that in the large N_c
limit, observables describable via mean-field theory are unchanged when the
spin and isospin of either nucleon are both flipped. This prediction is tested
for proton-proton and neutron-proton elastic scattering data and found to fail
badly. We argue that this failure can be traced to a lack of a clear separation
of scales between momentum of order N_c^{1/2} and N_c^1 when N_c is as small as
three. The situation is compounded by an anomalously low particle production
threshold due to approximate chiral symmetry.


title:
New Upper Limit of Terrestrial Equivalence Principle Test for Rotating
  Extended Bodies

abstract:
  Improved terrestrial experiment to test the equivalence principle for
rotating extended bodies is presented, and a new upper limit for the violation
of the equivalence principle is obtained at the level of 1.6$% \times
10^{\text{-7}}$, which is limited by the friction of the rotating gyroscope. It
means the spin-gravity interaction between the extended bodies has not been
observed at this level.


title: Possible large phase in psi(2S) -> 1-0- Decays

abstract:
  The strong and the electromagnetic amplitudes are analyzed on the basis of
the measurements of J/psi, psi(2S) -> 1-0- in e+e- experiments. The currently
available experimental information is revised with inclusion of the
contribution from e+e- -> gamma * -> 1-0- . The study shows that a large phase
around minus 90 degree between the strong and the electromagnetic amplitudes
could not be ruled out by the experimental data for psi(2S).


title:
Processes $e^+e^- \to c \bar c c \bar c$ and $e^+e^- \to J/\psi +gg$ at
  $\sqrt{s}=10.59$ GeV

abstract:
  BELLE Collaboration data for $J/\psi$ inclusive production in the processes
$e^+e^-\to J/\psi+gg$ and $e^+e^-\to J/\psi +c\bar c$ have been discussed.
These data have been compared with the predictions of two pQCD methods: the
former method use the information about the $J/\psi$ wave function, the latter
one do not use such information and is based on the quark-hadron duality
hypothesis. Both these calculation methods lead to essential discrepancy
between the theoretic predictions and the experimental data. The production
cross section dependence on effective gluon mass has been investigated for the
process $e^+e^-\to J/\psi+gg$. The production cross section of doubly charmed
baryons $\Xi ^{*}_{cc}$ has been estimated.


title:
Calculation of fluxes of charged particles and neutrinos from
  atmospheric showers

abstract:
  The results on the fluxes of charged particles and neutrinos from a
3-dimensional (3D) simulation of atmospheric showers are presented. An
agreement of calculated fluxes with data on charged particles from the AMS and
CAPRICE detectors is demonstrated. Predictions on neutrino fluxes at different
experimental sites are compared with results from other calculations.


title: Non-equilibrium Goldstone phenomenon in tachyonic preheating

abstract:
  The dominance of the direct production of elementary Goldstone waves is
demonstrated in tachyonic preheating by numerically determining the evolution
of the dispersion relation, the equation of state and the kinetic power spectra
for the angular degree of freedom of the complex matter field. The importance
of the domain structure in the order parameter distribution for the
quantitative understanding of the excitation mechanism is emphasized. Evidence
is presented for the very early decoupling of the low-momentum Goldstone modes.


title:
Bilarge mixing matrix and its invariance under "horizontal conjugation"
  -- a new discrete transformation for neutrinos

abstract:
  In the first part of the note, we consider a neutrino texture, where the
Dirac and righthanded Majorana masses are proportional. If the former are
approximately proportional also to the charged lepton masses, then taking
$\Delta m^2_{32}\sim3\times 10^{-3}$ eV$^2$ we estimate approximately that
$\Delta m^2_{21}\sim{\cal O}(10^{-5}$ eV$^2)$, what is not very different from
the recent KamLAND estimation $\Delta m^2_{21}\sim7\times 10^{-5}$ eV$^2$,
consistent with the LMA solar solution. In the second part, we show generically
that the {\it invariance} of neutrino mixing matrix under the simultaneous
discrete transformations $\nu_e\to-\nu_e$, $\nu_\mu\to\nu_\tau$,
$\nu_\tau\to\nu_\mu$ and $\nu_1\to-\nu_1$, $\nu_2\to-\nu_2$, $\nu_3\to\nu_3$
(neutrino "horizontal conjugation") {\it characterizes} the familiar bilarge
form of mixing matrix, favored phenomenologically at present. Then, in the case
of this form, the mass neutrinos $\nu_1$, $\nu_2$, $\nu_3$ get a new quantum
number, {\it covariant} in their mixings (neutrino "horizontal parity", equal
to $-1,-1, 1$, respectively). Conversely, such a covariance may be the {\it
origin} of the bilarge mixing matrix. In Section 5, the "horizontal parity" is
embedded in a group structure.


title:
The \mu\to e\gamma and \tau\to \mu\gamma decays with the inclusion of
  Lorentz and CPT violating effects

abstract:
  We study the Lorentz and CPT violating effects on the branching ratio and the
CP violating asymmetry of the lepton flavor violating interactions \mu\to
e\gamma and \tau\to \mu\gamma, in the model III version of the two Higgs
doublet model. Here we consider that the Lorentz and CPT violating effects
exist in the QED part of the interactions and enter into expressions in the
lepton propagators and in the lepton-photon vertex. We observe that there
exists a non-zero CP asymmetry. However, the Lorentz and CPT violating effects
on the braching ratio and the CP asymmetry are negligibly small.


title: Neutrino Democracy And Other Phenomenology From 5D SO(10)

abstract:
  We present a five dimensional supersymmetric SO(10) model compactified on an
orbifold $S^{(1)}/Z_2\tm Z_2'$. The gauge symmetry $G_{422}\equiv SU(4)_c\tm
SU(2)_L\tm SU(2)_R$, realized on one of the fixed points (branes), is
spontaneously broken to the MSSM via the higgs mechanism. Employing a flavor
${\cal U}(1)$ symmetry and suitably extending the 'matter' sector enables us to
understand large mixings in the neutrino sector via a democratic approach,
versus the small CKM mixings. A residual ${\cal R}$-symmetry on $G_{422}$ brane
helps eliminate the troublesome dimension five nucleon decay, while the ${\cal
U}(1)$ symmetry plays an essential role in suppressing dimension six decay. For
rare leptonic decays we expect ${\rm BR}(\mu \to e\ga)\sim {\rm BR}(\tau \to
\mu \ga)\sim {\rm BR}(\tau \to e\ga)$.


title:
Spatially Dependent Quantum Interference Effects in the Detection
  Probability of Charged Leptons Produced in Neutrino Interactions or Weak
  Decay Processes

abstract:
  Feynman's path amplitude formulation of quantum mechanics is used to analyse
the production of charged leptons from charged current weak interaction
processes. For neutrino induced reactions the interference effects predicted
are usually called `neutrino oscillations'. Similar effects in the detection of
muons from pion decay are here termed `muon oscillations'. Processes considered
include pion decay (at rest and in flight), and muon decay and nuclear
$\beta$-decay at rest. In all cases studied, a neutrino oscillation phase
different from the conventionally used one is found. A concise critical review
is made of previous treatments of the quantum mechanics of neutrino and muon
oscillations.


title:
Quantum Interference Effects in the Detection Probability of Charged
  Leptons Produced in Charged Current Weak Interactions

abstract:
  The phases of quantum interference effects in charged lepton production by
neutrinos (neutrino oscillations) following pion decay at rest and in flight,
muon decay and nuclear $\beta-$decay at rest as well as for `muon oscillations'
following pion decay at rest and in flight are calculated. The same phase is
found for neutrino and muon oscillations following pion decay at rest. The
results found disagree with the conventionally used value: $\phi_{12} = \Delta
m^2 L/(2P)$. Differences to previous treatments are briefly commented on


title: The evolution of the Universe

abstract:
  With the recent measurements of temperature and polarization anisotropies in
the microwave background by WMAP, we have entered a new era of precision
cosmology, with the cosmological parameters of a Standard Cosmological Model
determined to 1%. This Standard Model is based on the Big Bang theory and the
inflationary paradigm, a period of exponential expansion in the early universe
responsible for the large-scale homogeneity and spatial flatness of our
observable patch of the Universe. The spectrum of metric perturbations, seen in
the microwave background as temperature anisotropies, were produced during
inflation from quantum fluctuations that were stretched to cosmological size by
the expansion, and later gave rise, via gravitational collapse, to the observed
large-scale structure of clusters and superclusters of galaxies. Furthermore,
the same theory predicts that all the matter and radiation in the universe
today originated at the end of inflation from an explosive production of
particles that could also have been the origin of the present baryon asymmetry,
before the universe reached thermal equilibrium at a very large temperature.
  From there on, the universe cooled down as it expanded, in the way described
by the standard hot Big Bang model.


title: The Peccei-Quinn Field as Curvaton

abstract:
  A simple extension of the minimal supersymmetric standard model which
naturally and simultaneously solves the strong CP and mu problems via a
Peccei-Quinn and a continuous R symmetry is considered. This model is
supplemented with hybrid inflation and leptogenesis, but without taking the
specific details of these scenarios. It is shown that the Peccei-Quinn field
can successfully act as a curvaton generating the total curvature perturbation
in the universe in accord with the cosmic background explorer measurements. A
crucial phenomenon, which assists us to achieve this, is the "tachyonic
amplification" of the perturbation acquired by this field during inflation if
the field, in its subsequent evolution, happens to be stabilized for a while
near a maximum of the potential. In this case, the contribution of the field to
the total energy density is also enhanced ("tachyonic effect"), which helps
too. The cold dark matter in the universe consists, in this model, mainly of
axions which carry an isocurvature perturbation uncorrelated with the total
curvature perturbation. There are also lightest sparticles (neutralinos) which,
like the baryons, originate from the inflationary reheating and, thus, acquire
an isocurvature perturbation fully correlated with the curvature perturbation.
So, the overall isocurvature perturbation has a mixed correlation with the
adiabatic one. It is shown that the presently available bound on such an
isocurvature perturbation from cosmic microwave background radiation and other
data is satisfied. Also, the constraint on the non-Gaussianity of the curvature
perturbation obtained from the recent Wilkinson microwave anisotropy probe data
is fulfilled thanks to the "tachyonic effect".


title:
Charge Symmetry Violation Corrections to Determination of the Weinberg
  Angle in Neutrino Reactions

abstract:
  We show that the correction to the Paschos-Wolfenstein relation associated
with charge symmetry violation in the valence quark distributions is
essentially model independent. It is proportional to a ratio of quark momenta
that is independent of Q^2. This result provides a natural explanation of the
surprisingly good agreement found between our earlier estimates within several
different models. When applied to the recent NuTeV measurement, this effect
significantly reduces the discrepancy with other determinations of the Weinberg
angle.


title: On Power Suppressed Operators and Gauge Invariance in SCET

abstract:
  The form of collinear gauge invariance for power suppressed operators in the
soft-collinear effective theory is discussed. Using a field redefinition we
show that it is possible to make any power suppressed ultrasoft-collinear
operators invariant under the original leading order gauge transformations. Our
manipulations avoid gauge fixing. The Lagrangians to O(lambda^2) are given in
terms of these new fields. We then give a simple procedure for constructing
power suppressed soft-collinear operators in SCET_II by using an intermediate
theory SCET_I.


title: Real-time dynamics of the O(N) model in 1+1 dimensions

abstract:
  We study the non-equilibrium dynamics of the O(N) model in classical and
quantum field theory in 1+1 dimensions, for N > 1. We compare numerical results
obtained using the Hartree approximation and two next to leading order
approximations, the bare vertex approximation and the 2PI-1/N expansion. The
later approximations differ through terms of order g^2, where g is the scaled
coupling constant, g=\lambda/N. In this paper we investigate the statement
regarding the convergence with respect to g. We find that the differences
between these twoapproximation schemes diminish for larger values of N, when
\lambda is fixed.


title: Systematics of Coupling Flows in AdS Backgrounds

abstract:
  We give an effective field theory derivation, based on the running of Planck
brane gauge correlators, of the large logarithms that arise in the predictions
for low energy gauge couplings in compactified AdS}_5 backgrounds, including
the one-loop effects of bulk scalars, fermions, and gauge bosons. In contrast
to the case of charged scalars coupled to Abelian gauge fields that has been
considered previously in the literature, the one-loop corrections are not
dominated by a single 4D Kaluza-Klein mode. Nevertheless, in the case of gauge
field loops, the amplitudes can be reorganized into a leading logarithmic
contribution that is identical to the running in 4D non-Abelian gauge theory,
and a term which is not logarithmically enhanced and is analogous to a two-loop
effect in 4D. In a warped GUT model broken by the Higgs mechanism in the
bulk,we show that the matching scale that appears in the large logarithms
induced by the non-Abelian gauge fields is m_{XY}^2/k where m_{XY} is the bulk
mass of the XY bosons and k is the AdS curvature. This is in contrast to the UV
scale in the logarithmic contributions of scalars, which is simply the bulk
mass m. Our results are summarized in a set of simple rules that can be applied
to compute the leading logarithmic predictions for coupling constant relations
within a given warped GUT model. We present results for both bulk Higgs and
boundary breaking of the GUT gauge group.


title: Triple-Product Correlations in B -> V1 V2$ Decays and New Physics

abstract:
  In this paper we examine T-violating triple-product correlations (TP's) in B
-> V1 V2 decays. TP's are excellent probes of physics beyond the standard model
(SM) for two reasons: (i) within the SM, most TP's are expected to be tiny, and
(ii) unlike direct CP asymmetries, TP's are not suppressed by the small strong
phases which are expected in B decays. TP's are obtained via the angular
analysis of B -> V1 V2. In a general analysis based on factorization, we
demonstrate that the most promising decays for measuring TP's in the SM involve
excited final-state vector mesons, and we provide estimates of such TP's. We
find that there are only a handful of decays in which large TP's are possible,
and the size of these TP's depends strongly on the size of nonfactorizable
effects. We show that TP's which vanish in the SM can be very large in models
with new physics. The measurement of a nonzero TP asymmetry in a decay where
none is expected would specifically point to new physics involving large
couplings to the right-handed b-quark.


title:
Invisible decays of Higgs and other mesons in models with singlet
  neutrinos in large extra dimensions

abstract:
  In light of current atmospheric neutrino oscillation data, we revisit the
invisible decay of the standard model Higgs boson and other pseudoscalar mesons
which can be enhanced because of large number of KK modes in models with right
handed singlet neutrinos in large extra dimensions. We find that the invisible
decay rate of Higgs can be as large as $H\to b \bar b $ decay rate only for a
very restricted region of parameter space. This parameter space is even further
restricted if one demands that the dimensionless neutrino Yukawa coupling $\l$
is O(1). We have also studied the scenarios where singlet neutrino propagate in
a sub-space, which lowers the string scale $M_{\ast}$ and keeps neutrino Yukawa
coupling O(1). We have also considered decays of other spin-0 mesons to $\nu
\bar\nu$ and found the rates to be too small for measurement.


title:
Yukawa coupling unification and non-universal gaugino mediation of
  supersymmetry breaking

abstract:
  The requirement of Yukawa coupling unification highly constrains the SUSY
parameter space. In several SUSY breaking scenarios it is hard to reconcile
Yukawa coupling unification with experimental constraints from B(b->s gamma)
and the muon anomalous magnetic moment a_mu. We show that b-tau or even t-b-tau
Yukawa unification can be satisfied simultaneously with b->s gamma and a_mu in
the non-universal gaugino mediation scenario. Non-universal gaugino masses
naturally appear in higher dimensional grand unified models in which gauge
symmetry is broken by orbifold compactification. Relations between SUSY
contributions to fermion masses, b->s gamma and a_mu which are typical for
models with universal gaugino masses are relaxed. Consequently, these
phenomenological constraints can be satisfied simultaneously with a relatively
light SUSY spectrum, compared to models with universal gaugino masses.


title: Long-distance dimension-eight operators in B_K

abstract:
  Besides their appearance at short distances \gtrsim 1/M_W, local
dimension-eight operators also contribute to kaon matrix elements at long
distances of order \gtrsim 1/mu_ope, where mu_ope is the scale controlling the
Operator Product Expansion in pure QCD, without weak interactions. This comes
about in the matching condition between the effective quark Lagrangian and the
Chiral Lagrangian of mesons. Working in dimensional regularization and in a
framework where these effects can be systematically studied, we calculate the
correction from these long-distance dimension-eight operators to the
renormalization group invariant B_K factor of K^0-K^0bar mixing, to
next-to-leading order in the 1/Nc expansion and in the chiral limit. The
correction is controlled by the matrix element <0|\bar s_L \tilde{G}_{mu
nu}gamma^mu d_L|K^0>, is small, and lowers B_K.


title: All-orders infrared freezing of observables in perturbative QCD

abstract:
  We consider a Borel sum definition of all-orders perturbation theory for
Minkowskian QCD observables such as the R(e+e-) ratio, and show that both this
perturbative component and the additional non-perturbative Operator Product
Expansion (OPE) component can remain separately well-defined for all values of
energy sqrt(s), with the perturbative component dominating as s-->infinity, and
with both components contributing as s-->0. In the infrared s-->0 limit the
perturbative correction to the parton model result for R(e+e-) has an
all-orders perturbation theory component which smoothly freezes to the value
R(0)=2/b, where b=(33-2Nf)/6 is the first QCD beta-function coefficient with Nf
flavours of massless quarks. For freezing one requires Nf<9. The freezing
behaviour is manifested by the ``contour-improved'' or ``Analytic Perturbation
Theory'' (APT), in which an infinite subset of analytical continuation terms
are resummed to all-orders. We show that for the Euclidean Adler-D function,
D(Q^2), the perturbative component remains defined into the infrared provided
that ALL the renormalon singularities care taken into account, but no analogue
of the APT reorganisation of perturbation theory is possible. We perform
phenomenological comparisons of suitably smeared low-energy data for the
R(e+e-) ratio, with the perturbative freezing perdictions, and find good
agreement.


title: Production Ratios of Strange Baryons from QGP with Diquarks

abstract:
  Assuming that vector and scalar diquarks exist in the Quark-Gluon Plasma near
the critical temporature $T_c$, baryons can be produced through the processes
of quarks and diquarks forming $({1/2})^+$ baryon states. Ratios of different
baryons can be estimated through this method, if such kind of QGP with diquarks
can exists.


title: MSSM flat direction as a curvaton

abstract:
  We study in detail the possibility that the flat directions of the Minimal
Supersymmetric Standard Model (MSSM) could act as a curvaton and generate the
observed adiabatic density perturbations. For that the flat direction energy
density has to dominate the Universe at the time when it decays. We point out
that this is not possible if the inflaton decays into MSSM degrees of freedom.
If the inflaton is completely in the hidden sector, its decay products do not
couple to the flat direction, and the flat direction curvaton can dominate the
energy density. This requires the absence of a Hubble-induced mass for the
curvaton, e.g. by virtue of the Heisenberg symmetry. In the case of hidden
radiation, $n=9$ is the only admissible direction; for other hidden equations
of state, directions with lower $n$ may also dominate. We show that the MSSM
curvaton is further constrained severely by the damping of the fluctuations,
and as an example, demonstrate that in no-scale supergravity it would fragment
into $Q$ balls rather than decay. Damping of fluctuations can be avoided by an
initial condition, which for the $n=9$ direction would require an initial
curvaton amplitude of $\sim 10^{-2}M_p$, thereby providing a working example of
the MSSM flat direction curvaton.


title:
Polynomiality of helicity off-forward distribution functions in the
  chiral quark-soliton model

abstract:
  The polynomiality condition -- i.e. the property that Mellin moments of
off-forward distribution functions are even polynomials in the skewedness
parameter -- is a demanding check of consistency for model approaches. We
demonstrate that the helicity off-forward distribution functions in the chiral
quark-soliton model satisfy the polynomiality property. The proof contributes
to the demonstration that the description of off-forward distribution functions
in the model is consistent.


title:
Spontaneous symmetry breaking in gauge theories via Bose-Einstein
  condensation

abstract:
  We propose a mechanism naturally leading to the spontaneous symmetry breaking
in a gauge theory. The Higgs field is assumed to have global and gauged
internal symmetries. We associate a non zero chemical potential to one of the
globally conserved charges commuting with all of the gauge transformations.
This induces a negative mass squared for the Higgs field triggering the
spontaneous symmetry breaking of the global and local symmetries. The mechanism
is general and we test the idea for the electroweak theory in which the Higgs
sector is extended to possess an extra global Abelian symmetry. To this
symmetry we associate a non zero chemical potential. The Bose-Einstein
condensation of the Higgs leads, at tree level, to modified dispersion
relations for the Higgs field while the dispersion relations of the gauge
bosons and fermions remain undisturbed. The latter are modified through higher
order corrections. We have computed some corrections to the vacuum
polarizations of the gauge bosons and fermions. To quantify the corrections to
the gauge boson vacuum polarizations with respect to the Standard Model we
considered the effects on the T parameter. We finally derive the one loop
modified fermion dispersion relations.


title: Locking Internal and Space-Symmetries: Relativistic Vector Condensation

abstract:
  Internal and Lorentz symmetries are necessarily linked when considering non
scalar condensates. Here I review vectorial type condensation due to a non zero
chemical potential associated to some of the global conserved charges of the
theory. The phase structure is very rich since three distinct phases exists
depending on the value assumed by one of the zero chemical potential vector
self interaction terms. In a certain limit of the couplings and for large
chemical potential the theory is not stable. This limit corresponds to a gauge
type limit often employed to economically describe the ordinary vector mesons
self interactions in QCD. Our analysis is relevant since it leads to a number
of physical applications not limited to strongly interacting theories at non
zero chemical potential.


title:
Do the KamLAND and Solar Neutrino Data Rule out Solar Density
  Fluctuations?

abstract:
  We elucidate effects of solar density fluctuations on neutrino propagation
through the Sun. Using data from the recent solar neutrino and KamLAND
experiments we provide stringent limits on solar density fluctuations. It is
shown that the neutrino data constrains solar density fluctuations to be less
than beta = 0.05 at the 70 % confidence level, where beta is the fractional
fluctuation around the value given by the Standard Solar Model. We find that
the best fit to the combined solar neutrino and KamLAND data is given by beta =
0.


title: Selection rules for J^PC Exotic Hybrid Meson Decay in Large-N_c

abstract:
  The coupling of a neutral hybrid {1,3,5...}^-+ exotic particle (or current)
to two neutral (hybrid) meson particles with the same J^PC and J=0 is proved to
be sub-leading to the usual large-N_c QCD counting. The coupling of the same
exotic particle to certain two - (hybrid) meson currents with the same J^PC and
J=0 is also sub-leading. The decay of a {1,3,5...}^-+ hybrid to eta pi^0, eta'
pi^0, eta' eta, eta(1295) pi^0, pi(1300)^0 pi0, eta(1440) pi^0, a_0(980)^0
sigma or f_0(980) sigma is sub-leading, assuming that these final state
particles are (hybrid) mesons in the limit of large N_c.


title:
SU(3) Relations and the CP Asymmetries in B Decays to $\eta' K_S$, $\phi
  K_S$ and $K^+ K^- K_S$

abstract:
  We consider CP asymmetries in neutral $B$ meson decays to $\eta' K_S$, $\phi
K_S$, and $K^+ K^- K_S$. We use SU(3) relations to estimate or bound the
contributions to these amplitudes proportional to $V_{ub}^*V_{us}$. Such
contributions induce a deviation of the $S_f$ terms measured in these time
dependent CP asymmetries from that measured for $\psi K_S$. For the $K^+ K^-
K_S$ mode, we estimate the deviation to be of order 0.1. For the $\eta' K_S$
mode, we obtain an upper bound on this deviation of order 0.3. For the $\phi
K_S$ mode, we have to add a mild dynamical assumption to the SU(3) analysis due
to insufficient available data, yielding an upper bound of order 0.25. These
bounds may improve significantly with future data. While they are large at
present compared to the usually assumed Standard Model contribution, they are
obtained with minimal assumptions and hence provide more rigorous tests for new
physics. If measurements yield $|S_f-S_{\psi K}|$ that are much larger than our
bounds, it would make a convincing case for new physics.


title: Double meson production in ultraperipheral heavy ion collisions

abstract:
  The double meson production in ultraperipheral heavy ions collisions is
addressed, focusing on the particular case of rho-J/Psi from two-photon
reactions. The cross section at photon level is obtained using distinct
parameterizations for the gluon distribution on the light meson. The resulting
estimates for the nuclear case are presented and discussed. As a by product, we
estimate the double rho production cross section using the Pomeron-exchange
factorization relations.


title:
Quantum Field Theory Treatment of Neutrino Oscillations in Vacuum and in
  Matter

abstract:
  We study neutrino oscillations in vacuum and in matter using field
theoretical methods and wave-packets. In particular, we calculate the neutrino
propagator in the presence of matter with constant density for the case of two
flavors, obtaining the resonance formula. In the extreme relativistic limit,
the result of the usual quantum mechanical treatment is recovered with
interesting, but small modifications.


title: Testing resummed NLO-BFKL kernels

abstract:
  We propose a new method to test the (resummed) next-to-leading-order BFKL
evolution kernels using the Mellin transformed j-moments of the proton
structure function F_2.


title: Post-Inflationary Dynamics

abstract:
  We argue that $\Lambda$-driven inflation must overshoot into an era of
deflation. The deflationary period ends quickly with the creation of a hot
dense thermal barrier to the forward propagation of quantum correlations from
the period of inflationary particle production. Subsequent evolution is
controlled by the balance between the persistence of this barrier and the
growth in the 4-volume from which such correlations can be seen. This balance
can lead to power law expansion.


title: Nonperturbative structure of the quark-gluon vertex

abstract:
  The complete tensor structure of the quark--gluon vertex in Landau gauge is
determined at two kinematical points (`asymmetric' and `symmetric') from
lattice QCD in the quenched approximation. The simulations are carried out at
beta=6.0, using a mean-field improved Sheikholeslami-Wohlert fermion action,
with two quark masses ~ 60 and 115 MeV. We find substantial deviations from the
abelian form at the asymmetric point. The mass dependence is found to be
negligible. At the symmetric point, the form factor related to the
chromomagnetic moment is determined and found to contribute significantly to
the infrared interaction strength.


title: Predictions from the Fritzsch-Type Lepton Mass Matrices

abstract:
  We revisit the Fritzsch-type lepton mass matrix models confronted with new
experiments for neutrino mixings. It is shown that the model is viable and
leads to a rather narrow range of free parameters. Using empirical mixing
information between $\nu_e$ and $\nu_\mu$, and between $\nu_\mu$ and
$\nu_\tau$, it is predicted that the mixing angle between $nu_e$ and $\nu_\tau$
is in the range $0.04<|U_{13}|<0.20$, consistent with the CHOOZ experiment and
the lightest neutrino mass is $0.0004<m_1<0.0030$ eV. The range of the
effective mass measured in double beta decay is $0.002<< m_{ee}><0.007$ eV.


title:
No Hope to Kinematically Detect the Effective Masses of Muon and Tau
  Neutrinos

abstract:
  We show that the recent WMAP data can impose a generous upper bound on the
effective masses of electron, muon and tau neutrinos defined in the kinematic
measurements: $<m>^2_e + < m>^2_\mu + < m>^2_\tau = m^2_1 + m^2_2 + m^2_3 < 0.5
~ {\rm eV}^2$, or $<m>_\alpha < 0.71$ eV (for $\alpha = e, \mu, \tau$). When
current neutrino oscillation data are taken into account, we obtain $<m>_e
<0.24$ eV and $<m>_\mu \approx < m>_\tau < 0.24$ eV. Thus there is no hope to
kinematically detect $<m>_\mu$ and $<m>_\tau$ in any realistic experiments.


title:
Renormalization and factorization scale analysis of $\bar{b}b$
  production in antiproton-proton collisions

abstract:
  There a sizable and systematic discrepancy between experimental data on the
$\bar{b}b$ production in $\bar{\mathrm p}$p, $\gamma$p and $\gamma\gamma$
collisions and existing theoretical calculations within perturbative QCD.
Before interpreting this discrepancy as a signal of new physics, it is
important to understand quantitatively the ambiguities of conventional
calculations. In this paper the uncertainty coming from renormalization and
factorization scale dependence of finite order perturbation calculations of the
total cross section of $\bar{b}b$ production in $\bar{\mathrm{p}}$p collisions
is discussed in detail. It is shown that the mentioned discrepancy is reduced
significantly if these scales are fixed via the Principle of Minimal
Sensitivity.


title: Hybrid Stars

abstract:
  Recently there have been important developments in the determination of
neutron star masses which put severe constraints on the composition and
equation of state (EOS) of the neutron star matter. Here we study the effect of
quark and nuclear matter mixed phase on mass radius relationship of neutron
stars employing recent models from two classes of EOS's and discuss their
implications.


title: Higher order corrections to Color superconducting gaps

abstract:
  We find a (nonlocal) gauge where the wavefunction renormalization constant
does not get any corrections for all momenta in the hard-dense loop
approximation. In this gauge, we solve the Schwinger-Dyson equations for the
diquark condensate in dense QCD to calculate the Cooper pair gap. We determine
not only the exponent but also the prefactor of the gap in a gauge independent
way. We find that the higher order corrections increase the gap only by about
1.6 times to the leading order gap at Coulomb gauge.


title:
B_c meson spectrum and hyperfine splittings in theshifted
  large-N-expansion technique

abstract:
  In the framework of potential models for heavy quarkonium, we compute the
mass spectrum of the bottom-charmed $B_{c}$ meson system and spin-dependent
splittings from the Schr\"{o}dinger equation using the shifted-large-N
expansion technique. The masses of the lightest vector $B_{c}^{+}$ and
pseudoscalar $B_{c}$ states as well as the higher states below the threshold
are estimated. Our predicted result for the ground state energy is $%
6253_{-6}^{+15}$ $MeV$ and are generally in exact agreement with earlier
calculations. Calculations of the Schr\"{o}dinger energy eigenvalues are
carried out up to third order of the energy series. The parameters of each
potential are adjusted to obtain best agreement with the experimental
spin-averaged data (SAD). Our findings are compared with the observed data and
with the numerical results obtained by other numerical methods.


title: Flavor violation and warped geometry

abstract:
  Extra dimensions have interesting consequences for flavor physics. We
consider a setup where the standard model fermions and gauge fields reside in
the bulk of a warped extra dimension. Fermion masses and mixings are explained
by flavor dependent fermion locations, without relying on hierarchical Yukawa
couplings. We discuss various flavor violating processes induced by
(Kaluza-Klein) gauge boson exchange and non-renormalizable operators.
Experimental constraints are satisfied with a Kaluza-Klein scale of about 10
TeV. Some processes, such as muon-electron conversion, are within reach of next
generation experiments.


title:
Reduction method for dimensionally regulated one-loop N-point Feynman
  integrals

abstract:
  We present a systematic method for reducing an arbitrary one-loop N-point
massless Feynman integral with generic 4-dimensional momenta to a set comprised
of eight fundamental scalar integrals: six box integrals in D=6, a triangle
integral in D=4, and a general two-point integral in D space time dimensions.
All the divergences present in the original integral are contained in the
general two-point integral and associated coefficients. The problem of
vanishing of the kinematic determinants has been solved in an elegant and
transparent manner. Being derived with no restrictions regarding the external
momenta, the method is completely general and applicable for arbitrary
kinematics. In particular, it applies to the integrals in which the set of
external momenta contains subsets comprised of two or more collinear momenta,
which are unavoidable when calculating one-loop contributions to the
hard-scattering amplitude for exclusive hadronic processes at large momentum
transfer in PQCD. The iterative structure makes it easy to implement the
formalism in an algebraic computer program.


title: Thermodynamics of the high-temperature quark-gluon plasma

abstract:
  We review the various methods which have been employed recently to describe
the thermodynamics of the high temperature quark-gluon plasma using weak
coupling techniques, and we compare their results with those of most recent
lattice gauge calculations. Many of the difficulties encountered with
perturbation theory at finite temperature are in fact not specific to QCD but
are present in any field theory at finite temperature and will be discussed
first in the simple example of the scalar field theory. We discuss the merits
and limitations of various techniques which have been used to go beyond
perturbation theory in the soft sector, such as dimensional reduction, screened
perturbation theory or hard-thermal-loop perturbation theory, and Phi-derivable
approximations. In the last part of the review, we focus on the later, which
lead to a remarkably simple expression for the entropy of the quark-gluon
plasma. When complemented with further, physically motivated, approximations,
this approach reproduces accurately the entropy obtained from lattice gauge
calculations at temperatures above 2.5 T_c, where T_c is the deconfinement
temperature. This calculation thus provides also support to the physical
picture of the quark-gluon plasma as a gas of weakly interacting
quasiparticles.


title:
A unified approach to NNLO soft and virtual corrections in electroweak,
  Higgs, QCD, and SUSY processes

abstract:
  I present a unified approach to calculating the next-to-next-to-leading order
(NNLO) soft and virtual QCD corrections to cross sections for electroweak,
Higgs, QCD, and SUSY processes. I derive master formulas that can be used for
any of these processes in hadron-hadron and lepton-hadron collisions. The
formulas are based on a unified threshold resummation formalism and can be
applied to both total and differential cross sections for processes with either
simple or complex color flows and for various factorization schemes and
kinematics. As a test of the formalism, I rederive known NNLO results for
Drell-Yan and Higgs production, deep inelastic scattering, and W+ gamma
production, and I obtain expressions for several two-loop anomalous dimensions
and other quantities needed in next-to-next-to-leading-logarithm (NNLL)
resummations. I also present new results for the production of supersymmetric
charged Higgs bosons; massive electroweak vector bosons; photons; heavy quarks
in lepton-hadron and hadron-hadron collisions and in flavor-changing neutral
current processes; jets; and squarks and gluinos. The NNLO soft and virtual
corrections are often dominant, especially near threshold. Thus, a unified
approach to these corrections is important in the search for new physics at
present and future colliders.


title: Determining $\gamma$ using $B^\pm \to D K^\pm$ with multibody D decays

abstract:
  We propose a method for determining $\gamma$ using $B^\pm\to D K^\pm$ decays
followed by a multibody $D$ decay, such as $D \to K_S \pi^-\pi^+$, $D \to K_S
K^-K^+$ and $D \to K_S \pi^-\pi^+\pi^0$. The main advantages of the method is
that it uses only Cabibbo allowed $D$ decays, and that large strong phases are
expected due to the presence of resonances. Since no knowledge about the
resonance structure is needed, $\gamma$ can be extracted without any hadronic
uncertainty.


title: Comment on "Observability of the Neutrino Charge Radius"

abstract:
  In Phys. Rev. Lett. 89, 101802 (2002); erratum, ibid. 89, 229902(E) (2002),
Bernabeu, Papavassiliou, and Vidal claim that they can extract a
gauge-independent neutrino charge radius (NCR) which is, therefore, a physical
observable. We show here that this claim is incorrect by demonstrating that the
NCR is, in general, gauge-dependent.


title: Loop quantum gravity induced modifications to particle dynamics

abstract:
  The construction of effective Hamiltonians arising from Loop Quantum Gravity
and incorporating Planck scale corrections to the dynamics of photons and spin
1/2 particles is summarized. The imposition of strict bounds upon some
parameters of the model using already existing experimental data is also
reviewed.


title: T invariance of Higgs interactions in the standard model

abstract:
  In the standard model, the Cabibbo-Kobayashi-Maskawa matrix, which
incorporates the time-reversal violation shown by the charged current weak
interactions, originates from the Higgs-quark interactions. The Yukawa
interactions of quarks with the physical Higgs particle can contain further
complex phase factors, but nevertheless conserve T, as shown by constructing
the fermion T transformation and the invariant euclidean fermion measure.


title: The Top Quark, QCD, and New Physics

abstract:
  The role of the top quark in completing the Standard Model quark sector is
reviewed, along with a discussion of production, decay, and theoretical
restrictions on the top quark properties. Particular attention is paid to the
top quark as a laboratory for perturbative QCD. As examples of the relevance of
QCD corrections in the top quark sector, the calculation of $e^+e^-\to t {\bar
t}$ at next-to-leading-order QCD using the phase space slicing algorithm and
the implications of a precision measurement of the top quark mass are discussed
in detail. The associated production of a $t {\bar t}$ pair and a Higgs boson
in either $e^+e^-$ or hadronic collisions is presented at next-to-leading-order
QCD and its importance for a measurement of the top quark Yukawa coupling
emphasized. Implications of the heavy top quark mass for model builders are
briefly examined, with the minimal supersymmetric Standard Model and topcolor
discussed as specific examples.


title: Global Analysis of a Supersymmetric Pati-Salam Model

abstract:
  We perform a complete global phenomenological analysis of a realistic
string-inspired model based on the supersymmetric Pati-Salam $SU(4)\times
SU(2)_L \times SU(2)_R$ gauge group supplemented by a U(1) family symmetry, and
present predictions for all observables including muon $g-2$, $\tau \to \mu
\gamma$, and the CHOOZ angle. Our analysis demonstrates the compatibility of
such a model with all laboratory data including charged fermion masses and
mixing angles, LMA MSW and atmospheric neutrino masses and mixing angles, and
$b \to s \gamma$, allowing for small deviations from third family Yukawa
unification. We show that in such models the squark and slepton masses may be
rather light compared to similar models with exact Yukawa unification.


title:
pi+ pi0 Mass Difference in the Hidden Local Symmetry: A Dynamical Origin
  of Little Higgs

abstract:
  We calculate pi+ pi0 mass difference $\Delta m_\pi^2 \equiv m_{\pi^+}^2
-m_{\pi^0}^2$ in the Hidden Local Symmetry (HLS) model, based on the Wilsonian
matching and Wilsonian renormalization-group equations. Even without a1 meson
the result agrees well with the experiment in sharp contrast to the
conventional approach where the a1 meson plays a crucial role. For large Nf
QCD, there arises a large hierarchy between $\Delta m_\pi^2$ and the pi decay
constant $F_\pi^2$, $\Delta m_\pi^2/F_\pi^2 \ll 1$, near the critical point
where the chiral symmetry gets restored as the vector manifestation and the HLS
model becomes a little Higgs model with two sites and two links, with the
dynamically generated gauge coupling of the composite rho becoming vanishingly
small.


title:
Sum rule for a difference of proton and neutron total photoproduction
  cross-sections

abstract:
  Starting from very high energy inelastic electron-nucleon scattering with a
production of a hadronic state $X$ to be moved closely to the direction of the
initial nucleon, then utilizing analytic properties of parts of forward virtual
Compton scattering amplitudes on proton and neutron, one obtains the relation
between nucleon form factors and a difference of proton and neutron
differential electroproduction cross-sections. In particular, for the case of
small transferred momenta, one finally derives sum rule, relating Dirac proton
mean square radius and anomalous magnetic moments of proton and neutron to the
integral over a difference of the total proton and neutron photoproduction
cross-sections.


title: Hadronic Charmed Meson Decays Involving Tensor Mesons

abstract:
  Charmed meson decays into a pseudoscalar meson P and a tensor meson T are
studied. The charm to tensor meson transition form factors are evaluated in the
Isgur-Scora-Grinstein-Wise (ISGW) quark model. It is shown that the
Cabibbo-allowed decay $D_s^+\to f_2(1270)\pi^+$ is dominated by the
W-annihilation contribution and has the largest branching ratio in $D\to TP$
decays. We argue that the Cabibbo-suppressed mode $D^+\to f_2(1270)\pi^+$
should be suppressed by one order of magnitude relative to $D_s^+\to
f_2(1270)\pi^+$. When the finite width effect of the tensor resonances is taken
into account, the decay rate of $D\to TP$ is generally enhanced by a factor of
$2\sim 3$. Except for $D_s^+\to f_2(1270)\pi^+$, the predicted branching ratios
of $D\to TP$ decays are in general too small by one to two orders of magnitude
compared to experiment. However, it is very unlikely that the $D\to T$
transition form factors can be enhanced by a factor of $3\sim 5$ within the
ISGW quark model to account for the discrepancy between theory and experiment.
As many of the current data are still preliminary and lack sufficient statistic
significance, more accurate measurements are needed to pin down the issue.


title: Strange Color Superconductivity in QCD

abstract: This paper has been withdrawn by the author.


title:
Fermion mass, a new interpretation and approach to fermionic vacuum and
  associated quantum field theories

abstract:
  We argue that all fermionic states characterized by the (four) velocity not
momentum of the fermion are always occupied by a single fermion. So there is no
fermion number violation whatsoever. The mass of an elementary particle is not
determined by field equations and is quite arbitrary. Though constant in the
free state, interaction may cause a fermion to go from finite to zeromass
state, interpreted as vacuum, and vice versa. We argue that a massless fermion
can't be detected. Since occupation number is not fixed the arguments leading
to the above conclusions cannot be extended to bosons. We calculate scattering
amplitude for a typical process like Rutherford scattering in the light of the
present discussion to show that there is no contradiction with the experimental
results.


title: Infrared regularization with spin-3/2 fields

abstract:
  We present a Lorentz-invariant formulation of baryon chiral perturbation
theory including spin-3/2 fields. Particular attention is paid to the
projection on the spin-3/2 components of the delta fields. We also discuss the
nucleon mass and the pion-nucleon sigma term.


title: Order-alpha_s^2 corrections to one-particle inclusive processes in DIS

abstract:
  We analyze the order-$\alpha_s^2$ QCD corrections to semi-inclusive deep
inelastic scattering and present results for processes initiated by a gluon. We
focus in the most singular pieces of these corrections in order to obtain the
hitherto unknown NLO evolution kernels relevant for the non homogeneous QCD
scale dependence of these cross sections, and to check explicitly factorization
at this order. In so doing we discuss the prescription of overlapping
singularities in more than one variable.


title:
Towards a model independent determination of the phi -> f_0 - gamma
  coupling

abstract:
  A guide to the composition of the enigmatic f_0(980) and a_0(980) states is
their formation in phi-radiative decays. Precision data are becoming available
from the KLOE experiment at the DAPHNE machine at Frascati, as well as results
from SND and CMD-2 at VEPP-2M at Novosibirsk. We show how the coupling of the
f_0(980) to this channel can be extracted from these, independently of the
background provided by sigma production. To do this we use the fact that the
behaviour of both the f_0(980) and sigma cannot be determined by these data
alone, but is strongly constrained by experimental results from other hadronic
processes as required by unitarity. We find that the resulting coupling for the
phi -> gamma f_0(980) is about 10^{-4} GeV with a background that is quite
unlike that assumed if unitarity is neglected. This provides an object lesson
in how unitarity teaches us to add resonances. Not surprisingly the result is
crucially dependent on the pole position of the f_0(980), for which there are
still sizeable uncertainties. At present this leads to an uncertainty in the
phi -> f_0 gamma branching ratio which can only be fixed by further precision
data on the f_0(980).


title:
WMAP Constraints, SUSY Dark Matter and Implications for the Direct
  Detection of SUSY

abstract:
  Recently, WMAP has measured the cosmological parameters to a much greater
accuracy. We analyze the implications of this more precise measurement for
supersymmetric dark matter and for the direct detection of supersymmetry at
accelerators. We consider mSUGRA including also the hyperbolic branch in the
radiative breaking of the electroweak symmetry. On the part of the hyperbolic
branch where the lightest neutralino is dominantly a higgsino rather than being
mostly a bino, the relic density constraints are satisfied by coannihilation
with the next lightest neutralino and the light chargino. Including this branch
the lightest neutralino mass satisfies $m_{\chi_1^0}\leq 1200$ GeV for
$\tan\beta\leq 50$. Constraints of $b\to s+\gamma$ and of $g_{\mu}-2$ are also
analyzed. It is shown that the neutralino-proton cross section in each case
will fall within the reach of dark matter experiments. Possibility for the
direct detection of supersymmetry is discussed in the allowed regions of the
parameter space consistent with WMAP constraints. A brief discussion of the
hyperbolic branch and focus point region (HB/FP) is also given.


title:
Reply to the Comment by Fujikawa and Shrock on the Observability of the
  Neutrino Charge Radius

abstract:
  The ``Comment'' presented in hep-ph/0303188 is not even wrong: Fujikawa and
Shrock miss entirely the crucial point that the observable quantity associated
with the neutrino charge radius (NCR) is not given by the (off-shell) one-loop
vertex $\gamma^{*}\nu \nu$ dictated by the Feynman diagrams in the $R_{\xi}$
gauge-fixing scheme.


title:
Large mixing angle solution to the solar neutrino problem and random
  matter density perturbations

abstract:
  There are reasons to believe that mechanisms exist in the solar interior
which lead to random density perturbations in the resonant region of the Large
Mixing Angle solution to the solar neutrino problem. We find that, in the
presence of these density perturbations, the best fit point in the
(sin^2(2\theta), Delta_m^2) parameter space moves to smaller values, compared
with the values obtained for the standard LMA solution. Combining solar data
with KamLAND results, we find a new compatibility region, which we call
VERY-LOW LMA, where sin^2(2\theta) ~ 0.6 and Delta_m^2~2e-5 eV^2, for random
density fluctuations of order 5% < \xi< 8%. We argue that such values of
density fluctuations are still allowed by helioseismological observations at
small scales of order 10 - 1000 km deep inside the solar core.


title: The Color Glass Condensate and High Energy Scattering in QCD

abstract:
  At very high energies or small values of Bjorken x, the density of partons,
per unit transverse area, in hadronic wavefunctions becomes very large leading
to a saturation of partonic distributions. When the scale corresponding to the
density per unit transverse area, the saturation scale Q_s, becomes large
(Q_s\gg \Lambda_{QCD}), the coupling constant becomes weak (\alpha_S(Q_s)\ll 1)
which suggests that the high energy limit of QCD may be studied using weak
coupling techniques. This simple idea can be formalized in an effective theory,
the Color Glass Condensate (CGC), which describes the behavior of the small x
components of the hadronic wavefunction in QCD. The Green functions of the
theory satisfy Wilsonian renormalization group equations which reduce to the
standard linear QCD evolution equations in the limit of low parton densities.
The effective theory has a rich structure that has been explored using
analytical and numerical techniques. The CGC can be applied to study a wide
range of high energy scattering experiments from Deep Inelastic Scattering at
HERA and the proposed Electron Ion Collider (EIC) to proton/deuterium-nucleus
and nucleus-nucleus experiments at the RHIC and LHC colliders.


title: Neutrinoless double-beta decay and effective field theory

abstract:
  We analyze neutrinoless double $\beta$-decay ($\nbb$-decay) mediated by heavy
particles from the standpoint of effective field theory. We show how symmetries
of the $\nbb$-decay quark operators arising in a given particle physics model
determine the form of the corresponding effective, hadronic operators. We
classify the latter according to their symmetry transformation properties as
well as the order at which they appear in a derivative expansion. We apply this
framework to several particle physics models, including R-parity violating
supersymmetry (RPV SUSY) and the left-right symmetric model (LRSM) with mixing
and a right-handed Majorana neutrino. We show that, in general, the pion
exchange contributions to $\nbb$-decay dominate over the short-range
four-nucleon operators. This confirms previously published RPV SUSY results and
allows us to derive new constraints on the masses in the LRSM. In particular,
we show how a non-zero mixing angle $\zeta$ in the left-right symmetry model
produces a new potentially dominant contribution to $\nbb$-decay that
substantially modifies previous limits on the masses of the right-handed
neutrino and boson stemming from constraints from $\nbb$-decay and vacuum
stability requirements.


title: Observing a Light CP-Violating Higgs Boson in Diffraction

abstract:
  Light CP-violating Higgs bosons with mass lower than 70 GeV might have
escaped detection in direct searches at the LEP collider. They may remain
undetected in conventional search channels at the Tevatron and LHC. In this
Letter we show that exclusive diffractive reactions may be able to probe for
the existence of these otherwise elusive Higgs particles. As a prototype
example, we calculate diffractive production cross-sections of the lightest
Higgs boson within the framework of the Minimal Supersymmetric Standard Model
with explicit CP violation. Our analysis shows that the challenging regions of
parameter space corresponding to a light CP-violating Higgs boson might be
accessible at the LHC provided suitable proton tagging detectors are installed.


title: Simple $E_6$ Unification with Anomalous $U(1)_A$ Symmetry

abstract:
  We propose simpler Higgs sectors in $E_6$ grand unified theory with anomalous
$U(1)_A$ gauge symmetry than the previous model in Ref.1). As in the previous
model, the doublet-triplet splitting can be realized in a natural way, while
proton decay via dimension 5 operators is suppressed and gauge coupling
unification is also realized without fine-tuning. Combining the matter sector,
simple complete GUTs can be obtained. Since the Higgs sector is simpler, the
gauge coupling constant at the cutoff scale can be in perturbative region, and
therefore, the estimated value of the lifetime of a nucleon in this model,
$\tau_p(p\to e^+\pi^0)\sim 5\times 10^{33}$ years, becomes more reliable.


title: Field dynamics and kink-antikink production in rapidly expanding systems

abstract:
  Field dynamics in a rapidly expanding system is investigated by transforming
from space-time to the rapidity - proper-time frame. The proper-time dependence
of different contributions to the total energy is established. For systems
characterized by a finite momentum cut-off, a freeze-out time can be defined
after which the field propagation in rapidity space ends and the system decays
into decoupled solitons, antisolitons and local vacuum fluctuations. Numerical
simulations of field evolutions on a lattice for the (1+1)-dimensional $\Phi^4$
model illustrate the general results and show that the freeze-out time and
average multiplicities of kinks (plus antikinks) produced in this 'phase
transition' can be obtained from simple averages over the initial ensemble of
field configurations. An extension to explicitly include additional dissipation
is discussed. The validity of an adiabatic approximation for the case of an
overdamped system is investigated. The (3+1)-dimensional generalization may
serve as model for baryon-antibaryon production after heavy-ion collisions.


title: Screening effects in the ultrahigh energy neutrino interactions

abstract:
  We study possible saturation effects in the total cross-section describing
interaction of ultrahigh energy neutrinos with nucleons. This analysis is
performed within the two approaches, i.e. within the Golec-Biernat W\"usthoff
saturation model and within the scheme unifying the DGLAP and BFKL dynamics
incorporating non-linear screening effects which follow from the
Balitzki-Kovchegov equation. The structure functions in both approaches are
constrained by HERA data. It is found that screening effects affect
extrapolation of the neutrino-nucleon total cross-sections to ultrahigh
neutrino energies $E_{\nu}$ and reduce their magnitude by a factor equal to
about 2 at $E_{\nu} \sim 10^{12}GeV$. This reduction becomes amplified by
nuclear shadowing in the case of the neutrino-nucleus cross-sections and
approximate estimate of this effect is performed.


title: Detecting the Neutrino Mass Hierarchy with a Supernova at IceCube

abstract:
  IceCube, a future km^3 antarctic ice Cherenkov neutrino telescope, is highly
sensitive to a galactic supernova (SN) neutrino burst. The Cherenkov light
corresponding to the total energy deposited by the SN neutrinos in the ice can
be measured relative to background fluctuations with a statistical precision
much better than 1%. If the SN is viewed through the Earth, the matter effect
on neutrino oscillations can change the signal by more than 5%, depending on
the flavor-dependent source spectra and the neutrino mixing parameters.
Therefore, IceCube together with another high-statistics experiment like
Hyper-Kamiokande can detect the Earth effect, an observation that would
identify specific neutrino mixing scenarios that are difficult to pin down with
long-baseline experiments. In particular, the normal mass hierarchy can be
clearly detected if the third mixing angle is not too small, sin^2 theta_13 <
10^-3. The small flavor-dependent differences of the SN neutrino fluxes and
spectra that are found in state-of-the-art simulations suffice for this
purpose. Although the absolute calibration uncertainty at IceCube may exceed
5%, the Earth effect would typically vary by a large amount over the duration
of the SN signal, obviating the need for a precise calibration. Therefore,
IceCube with its unique geographic location and expected longevity can play a
decisive role as a "co-detector" to measure SN neutrino oscillations. It is
also a powerful stand-alone SN detector that can verify the delayed-explosion
scenario.


title: Geometric scaling in exclusive processes

abstract:
  We show that according to the present understanding of the energy evolution
of the observables measured in deep-inelastic scattering, the photon-proton
scattering amplitude has to exhibit geometric scaling at each impact parameter.
We suggest a way to test it experimentally at HERA. A qualitative analysis
based on published data is presented and discussed.


title: Isospin relation for the tau decay modes

abstract:
  Since the fifties, isospin relations have been used in particle physics to
understand the properties of multihadrons final states. In the case of the tau
lepton, they allow to relate the partial widths of the decay modes to the cross
sections of e+e- annihilations. A pedagogical introduction to the construction
of isospin states for meson systems and an updated review of the use of isospin
relations in the study of the tau lepton are presented.


title: Towards 5D Grand Unification without SUSY Flavor Problem

abstract:
  We consider the renormalization group approach to the SUSY flavor problem in
the supersymmetric SU(5) model with one extra dimension. In higher dimensional
SUSY gauge theories, it has been recently shown that power corrections due to
the Kaluza-Klein states of gauge fields run the soft masses generated at the
orbifold fixed point to flavor conserving values in the infra-red limit. In
models with GUT breaking at the brane where the GUT scale can be larger than
the compactification scale, we show that the addition of a bulk Higgs
multiplet, which is necessary for the successful unification, is compatible
with the flavor universality achieved at the compactification scale.


title:
A possible supersymmetric solution to the discrepancy between B -> \phi
  K_S and B -> \eta' K_S CP asymmetries

abstract:
  We present a possible supersymmetric solution to the discrepancy between the
observed mixing CP asymmetries in B -> \phi K_S and B -> \eta' K_S. We show
that due to the different parity in the final states of these processes, their
supersymmetric contributions from the R-sector have an opposite sign, which
naturally explain the large deviation between S_{\phi K_S} and S_{\eta' K_S}.
We also consider the proposed mechanisms to solve the puzzle of the observed
large branching ratio of B -> \eta' K and study their impact on S_{eta' K_S}.


title: Probing the Light Pseudoscalar Window

abstract:
  Very light pseudoscalars can arise from the symmetry-breaking sector in many
extensions of the Standard Model. If their mass is below 200 MeV, they can be
long-lived and have interesting phenomenology. We discuss the experimental
constraints on several models with light pseudoscalars, including one in which
the pseudoscalar is naturally fermiophobic. Taking into account the stringent
bounds from rare K and B decays, we find allowed parameter space in each model
that may be accessible in direct production experiments. In particular, we
study the photoproduction of light pseudoscalars at Jefferson Lab and conclude
that a beam dump experiment could explore some of the allowed parameter space
of these models.


title: Transport coefficients from the 2PI effective action

abstract:
  We show that the lowest nontrivial truncation of the two-particle irreducible
(2PI) effective action correctly determines transport coefficients in a weak
coupling or 1/N expansion at leading (logarithmic) order in several
relativistic field theories. In particular, we consider a single real scalar
field with cubic and quartic interactions in the loop expansion, the O(N) model
in the 2PI-1/N expansion, and QED with a single and many fermion fields.
Therefore, these truncations will provide a correct description, to leading
(logarithmic) order, of the long time behavior of these systems, i.e. the
approach to equilibrium. This supports the promising results obtained for the
dynamics of quantum fields out of equilibrium using 2PI effective action
techniques.


title: To be or not to Be? - First Evidence for Neutrinoless Double Beta Decay

abstract:
  Double beta decay is indispensable to solve the question of the neutrino mass
matrix together with $\nu$ oscillation experiments. Recent analysis of the most
sensitive experiment since nine years - the HEIDELBERG-MOSCOW experiment in
Gran-Sasso - yields a first indication for the neutrinoless decay mode. This
result is the first evidence for lepton number violation and proves the
neutrino to be a Majorana particle. We give the present status of the analysis
in this report. It excludes several of the neutrino mass scenarios allowed from
present neutrino oscillation experiments - only degenerate scenarios and those
with inverse mass hierarchy survive. This result allows neutrinos to still play
an important role as dark matter in the Universe. To improve the accuracy of
the present result, considerably enlarged experiments are required, such as
GENIUS. A GENIUS Test Facility has been funded and will come into operation by
early 2003.


title: Revisiting renormalization schemes in a differential equation approach

abstract:
  We reconsider the choice of renormalization schemes in a
differential-equation approach to aid the discussion of the renormalization of
the unstable particles and the CKM matrix in the Standard Model. Certain mass
dependent schemes do not satisfy these natural differential equations modulo
trace anomaly. By the way, the Callan-Symanzik equations were employed to show
that both mass dependent and independent schemes realize fermion decoupling in
the same way.


title:
Quarkonium in Heavy Ion Collisions -- high-energy multiple scattering of
  quark pair in nuclei

abstract:
  Quarkonium suppression in heavy ion collisions is a potential signature of
the formation of the quark-gluon plasma. After a very brief review of the J/psi
result at CERN, we restrict our discussion to the effects of the high-energy
multiple scattering of the quark pair in the colliding nuclei.


title:
Schwinger Model and String Percolation in Hadron-Hadron and Heavy Ion
  Collisions

abstract:
  In the framework of the Schwinger Model for percolating strings we establish
a general relation between multiplicity and transverse momentum square
distributions in hadron-hadron and heavy ion collisions. Some of our results
agree with the Colour Glass Condensate model.


title: Kinetic Equations from the Two-Particle-Irreducible 1/N-Expansion

abstract:
  We present kinetic equations that describe the evolution of O(N)-symmetric
real scalar quantum fields out of thermal equilibrium in a systematic
nonperturbative approximation scheme. This description starts from the
1/N-expansion of the 2PI effective action to next-to-leading order, which
includes scattering and memory effects. From this starting point one is lead to
evolution equations for the propagator, which are nonlocal in time. Numerical
solutions showed that the propagator depends only very slightly on the center
coordinates already after moderate times, and that correlations between earlier
and later times are suppressed exponentially, which causes an effective memory
loss. Exploiting these two observations, we combine a first order gradient
expansion with a Wigner transformation to derive our kinetic equations, which
are local in time, from the nonlocal evolution equations. In contrast to
standard descriptions based on loop expansions, our kinetic equations remain
valid even for nonperturbatively large fluctuations. Additionally, employing a
quasi-particle approximation, we eventually arrive at a generalized Boltzmann
equation.


title: What about a beta-beam facility for low energy neutrinos?

abstract:
  A novel method to produce neutrino beams has recently been proposed : the
beta-beams. This method consists in using the beta-decay of boosted radioactive
nuclei to obtain an intense, collimated and pure neutrino beam. Here we propose
to exploit the beta-beam concept to produce neutrino beams of low energy. We
discuss the applications of such a facility as well as its importance for
different domains of physics. We focus, in particular, on neutrino-nucleus
interaction studies of interest for various open issues in astrophysics,
nuclear and particle physics. We suggest possible sites for a low energy
beta-beam facility.


title: Study of Scalar Mesons and Related Radiative Decays

abstract:
  After a brief review of the puzzling light scalar meson sector of QCD, a
brief summary will be given of a paper concerning radiative decays involving
the light scalars. There, a simple vector meson dominance model is constructed
in an initial attempt to relate a large number of the radiative decays
involving a putative scalar nonet to each other. As an application it is
illustrated why $a_0(980)-f_0(980)$ mixing is not expected to greatly alter the
$f_0/a_0$ production ratio for radiative $\phi$ decays.


title:
REPLY TO HEP-PH/0211241 "On the extra factor of two in the phase of
  neutrino oscillations"

abstract:
  Arguments continue to appear in the literature concerning the validity of the
standard oscillation formula. We point out some misunderstandings and try to
explain in simple terms our viewpoint.


title:
Relation between the Polyakov loop and the chiral order parameter at
  strong coupling

abstract:
  We discuss the relation between the Polyakov loop and the chiral order
parameter at finite temperature by using the Gocksch-Ogilvie model with
fundamental or adjoint quarks. The model is based on the double expansion of
strong coupling and large dimensionality on the lattice. In an analytic way
with the mean field approximation employed, we show that the confined phase
must be accompanied by the spontaneous breaking of the chiral symmetry for both
fundamental and adjoint quarks. Then we proceed to numerical analysis to look
into the coupled dynamics of the Polyakov loop and the chiral order parameter.
In the case of fundamental quarks, the pseudo-critical temperature inferred
from the Polyakov loop behavior turns out to coincide with the pseudo-critical
temperature of the chiral phase transition. We discuss the physical implication
of the coincidence of the pseudo-critical temperatures in two extreme cases;
one is the deconfinement dominance and the other is the chiral dominance. As
for adjoint quarks, the deconfinement transition of first order persists and
the chiral phase transition occurs distinctly at higher temperature than the
deconfinement transition does. The present model study gives us a plausible
picture to understand the results from the lattice QCD and aQCD simulations.


title:
Next-to-leading order QCD corrections to A_TT for prompt photon
  production

abstract:
  We present a next-to-leading order QCD calculation of the cross section for
isolated large-p_T prompt photon production in collisions of transversely
polarized protons. We devise a simple method of dealing with the phase space
integrals in dimensional regularization in the presence of the cos(2 phi)
azimuthal-angular dependence occurring for transverse polarization. Our results
allow to calculate the double-spin asymmetry A_TT for this process at
next-to-leading order accuracy, which may be used at BNL-RHIC to measure the
transversity parton distributions of the proton.


title: Prediction of $U_{e3}$ in Neutrino Mass Matrix with Two Zeros

abstract:
  We have discussed predictions of $|U_{e3}|$ and $J_{CP}$ in the framework of
the neutrino mass matrix with two zeros. In the case of the best fit values of
$\tan^2\theta_{12}$, $\tan^2\theta_{23}$, $\Delta m^2_{\rm sun}$ and $\Delta
m_{\rm atm}^2$, the prediction of $|U_{e3}|$ is $0.11\sim 0.14$. The lower
bound of $|U_{e3}|$ is 0.05, which depends on $\tan\theta_{12}$ and
$\tan\theta_{23}$. We have investigated the stability of these predictions
taking account of small corrections to zeros, which may come from radiative
corrections or off-diagonal elements of the charged lepton massmatrix.
  The lower bound of $|U_{e3}|$ comes down considerably due to the small
corrections to zeros.


title:
Spin Correlations in top quark pair production near threshold at the $
  e^- e^+ $ Linear Collider

abstract:
  We investigate the spin correlations in top quark pair production near
threshold at the $ e^- e^+ $ linear collider. Comparing with the results above
the threshold region, we find that near the threshold region the off-diagonal
basis, the optimized decomposition of the top quark spins above the threshold
region, does not exist, and the beamline basis is the optimal basis, in which
there are the dominant spin components: the up-down (UD) component for $e_L^-
e^+$ scattering and the down-up (DU) component for $e_R^- e^+$ scattering can
make up more than 50% of the total cross section, respectively.


title: A note on the neutrino mass implications of the K2K experiment

abstract:
  The K2K experiment has presented the first results on the observation of
nu_mu. They show a depletion compared to the expectations and are consistent
with neutrino oscillations with a mass-splitting in the range favoured by the
Super-Kamiokande atmospheric neutrino measurements. Here we examine the extent
by which the range of Delta m^2 obtained from the K2K measurements can vary due
to the uncertainties in the flux, cross-section, and detector efficiency.


title: Color superconductor with a color-sextet condensate

abstract:
  We analyze color superconductivity of one massive flavor quark matter at
moderate baryon density with a spin-zero color-sextet condensate. The most
general Higgs-type ground-state expectation value of the order parameter
implies complete breakdown of the SU(3)xU(1) symmetry. However, both the
conventional fourth-order polynomial effective bosonic description, and the
NJL-type fermionic description in the mean-field approximation favor an
enhanced SO(3) symmetry of the ground state. We ascribe this finding to the
failure of the mean-field approximation and propose that a more sophisticated
technique is needed.


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

abstract:
  Exotic dark matter together with the vacuum energy (cosmological constant)
seem to dominate in the flat Universe. Thus direct dark matter detection is
central to particle physics and cosmology. Supersymmetry provides a natural
dark matter candidate, the lightest supersymmetric particle (LSP). It is
possible to obtain detectable rates, but realystically they are expected to be
much lower than the present experimental goals. So one should exploit two
characteristic signatures of the reaction, namely the modulation effect and the
correlation with the sun's motion in directional experiments. In standard non
directional experiments the modulation is small, less than two per cent. In the
case of the directional experiments, the main subject of this paper, we find
two novel features, which are essentially independent of the SUSY model
employed, namely: 1) The forward-backward asymmetry, with respect to the sun's
direction of motion, is very large and 2) The modulation observed in a plane
perpendicular to the sun's motion can be higher than 20 per cent and is
direction dependent.


title: Reactor Neutrino Experiments Compared to Superbeams

abstract:
  We present a detailed quantitative discussion of the measurement of the
leptonic mixing angle $\sin^2 2 \theta_{13}$ with a future reactor neutrino
oscillation experiment consisting of a near and far detector. We perform a
thorough analysis of the impact of various systematical errors and compare the
resulting physics potential to the one of planned first-generation superbeam
experiments. Furthermore, we investigate the complementarity of both types of
experiments. We find that, under realistic assumptions, a determination of
$\sin^2 2 \theta_{13}$ down to $10^{-2}$ is possible with reactor experiments.
They are thus highly competitive to first-generation superbeams and may be able
to test $\sin^2 2 \theta_{13}$ on shorter timescales. In addition, we find that
the combination of a KamLAND-size reactor experiment with one or two superbeams
could substantially improve the ability to access the neutrino mass hierarchy
or the leptonic CP phase.


title:
QCD corrections to single top quark production in electron photon
  interactions

abstract:
  Single top quark production in electron photon interactions provides a clean
environment for the measurement of the Cabbibo-Kobayashi-Maskawa matrix element
Vtb. Aiming an experimental precision at the percent level the knowledge of
radiative corrections is important. In this paper we present results for the
radiative corrections in quantum chromodynamics.


title: A Future Linear Collider with polarised beams: Searches for New Physics

abstract:
  There exists a world--wide consensus for a future $e^+e^-$ Linear Collider in
the energy range between $\sqrt{s}=500--1000$ GeV as the next large facility in
HEP. The Linear Collider has a large physics potential for the discovery of new
physics beyond the Standard Model and for precision studies of the Standard
Model itself. It is well suited to complement and extend the physics program of
the LHC. The use of polarised beams at a Linear Collider will be one of the
powerful tools. In this paper some highlights of searches for physics beyond
the Standard Model at a future Linear Collider with polarised $e^-$ and $e^+$
beams are summarised.


title: Lambda_b lifetime puzzle in heavy-quark expansion

abstract:
  Lifetime differences of heavy hadrons can be consistently computed in
heavy-quark expansion. The leading effects appear through spectator
interactions at order 1/m_b^3. We compute a well-defined subset of 1/m_b^4
corrections to the lifetime ratio of Lambda_b baryon and B_d meson. We find
that these corrections are large and should be taken into account in the
systematic analysis of heavy hadron lifetimes. We claim that they could shift
the ratio \tau_{\Lambda_b}/\tau_{B_d} by as much as -4.5%, significantly
reducing the discrepancy between the theoretical predictions and experimental
observations.


title: Variations of Little Higgs Models and their Electroweak Constraints

abstract:
  We calculate the tree-level electroweak precision constraints on a wide class
of little Higgs models including: variations of the Littlest Higgs SU(5)/SO(5),
SU(6)/Sp(6), and SU(4)^4/SU(3)^4. By performing a global fit to the precision
data we find that for generic regions of the parameter space the bound on the
symmetry breaking scale f is several TeV, where we have kept the normalization
of f constant in the different models. For example, the ``minimal''
implementation of SU(6)/Sp(6) is bounded by f>3.0 TeV throughout most of the
parameter space, and SU(4)^4/SU(3)^4 is bounded by f^2 = f_1^2+f_2^2 > (4.2
TeV)^2. In certain models, such as SU(4)^4/SU(3)^4, a large f does not directly
imply a large amount of fine tuning since the heavy fermion masses that
contribute to the Higgs mass can be lowered below f for a carefully chosen set
of parameters. We also find that for certain models (or variations) there exist
regions of parameter space in which the bound on f can be lowered into the
range 1-2 TeV. These regions are typically characterized by a small mixing
between heavy and standard model gauge bosons, and a small (or vanishing)
coupling between heavy U(1) gauge bosons and the light fermions. Whether such a
region of parameter space is natural or not is ultimately contingent on the UV
completion.


title: $\pi\Xi$ phase shifts and CP Violation in ${\Omega\to\pi\Xi}$ Decay

abstract:
  In the study of CP violation signals in ${\O}\to\pi\Xi$ nonleptonic decays,
the strong $J$=3/2 $P$ and $D$ phase shifts for the $\pi\Xi$ final-state
interactions are needed. These phases are calculated using an effective
Lagrangian model, including $\Xi$, $\Xi^*$(1530), $\rho$ and the $\sigma$-term,
in the intermediate states. The $\sigma$-term is calculated in terms of the
scalar form factor of the baryon.


title: Homeotic Supersymmetry

abstract:
  It is commonly believed that unbroken supersymmetry (SUSY) implies that all
members of a supermultiplet have the same mass. We demonstrate that this is not
true, by exhibiting a simple counterexample. We employ the formalism of
homeotic fermions, in a simple model where CPT conjugate fermions have
different masses. This model can be supersymmetrized to a hypermultiplet of
fields which form a representation of the conventional N=2 SUSY algebra.
Nevertheless, CPT conjugate states in this hypermultiplet have different
masses. These surprising results do not violate either the CPT theorem nor the
Haag-Lopuszanski-Sohnius theorem.


title:
Lepton flavor violating signals of gauge bosons $Z^{\prime}$ at future
  $e^{+}e^{-}$ colliders

abstract:
  Many models, such as topcolor-assisted technicolor (TC2) models and
flavor-universal TC2 models, predict the existence of extra U(1) gauge bosons
$Z^{\prime}$, which couple preferentially to the third generation. The lepton
flavor violating (LFV) signals of these new particles at the future
$e^{+}e^{-}$ colliders (LCs) are discussed via calculating its contributions to
the LFV process $e^{+}e^{-}\to\mu\tau$. We calculate the cross section of this
process and discuss its dependence on the beam polarization. The ratio of
signal over square root of the background $(S/\sqrt{B})$ is also calculated.
The results show that the LFV signals of the gauge bosons $Z^{\prime}$ may be
detected at the future LC experiments.


title: The nature of power corrections in large $\beta_0$ approximation

abstract:
  We investigate the nature of power corrections and infrared renormalon
singularities in large $\beta_0$ approximation. We argue that the power
correction associated with a renormalon pole singularity should appear at O(1),
in contrast to the renormalon ambiguity appearing at $O(1/\beta_0)$, and give
an explanation why the leading order renormalon singularities are generically
poles.


title:
A comment on the paper `Coherence in Neutrino Oscillations' by C.Giunti.
  Either lepton flavour eigenstates or neutrino oscillations do not exist

abstract:
  The definition of `lepton flavour eigenstates' introduced in a recent paper
hep-ph/0302045 is in disagreement with the Standard Model prediction for the
structure of the leptonic charged current and implies the absence of neutrino
oscillations following pion decay, in contradiction to experimental data


title:
Sneutrino Inflation in the Light of WMAP: Reheating, Leptogenesis and
  Flavour-Violating Lepton Decays

abstract:
  We reconsider the possibility that inflation was driven by a sneutrino - the
scalar supersymmetric partner of a heavy singlet neutrino - in the minimal
seesaw model of neutrino masses. We show that this model is consistent with
data on the cosmic microwave background (CMB), including those from the WMAP
satellite. We derive and implement the CMB constraints on sneutrino properties,
calculate reheating and the cosmological baryon asymmetry arising via direct
leptogenesis from sneutrino decays following sneutrino inflation, and relate
them to light neutrino masses. We show that this scenario is compatible with a
low reheating temperature that avoids the gravitino problem, and calculate its
predictions for flavour-violating decays of charged leptons. We find that $\mu
\to e \gamma$ should occur close to the present experimental upper limits, as
might also $\tau \to \mu \gamma$.


title: Realistic split fermion models

abstract:
  The standard model flavor structure can be explained in theories where the
fermions are localized on different points in a compact extra dimension. We
explain how models with two bulk scalars compactified on an orbifold can
produce such separations in a natural way. We show that, generically, models of
Gaussian overlaps are unnatural since they require very large Yukawa couplings
between the fermions and the bulk scalars. We present a two scalar model that
accounts naturally for the quark flavor parameters and in particular yields
order one CP violating phase.


title:
QCD sum rule analysis of the coupling constants g_{\rho\eta\gamma} and
  g_{\omega\eta\gamma}

abstract:
  The coupling constants g$_{\rho\eta\gamma}$ and g$_{\omega\eta\gamma}$ are
calculated using QCD sum rules method by studying the three point
${\rho\eta\gamma}$ and ${\omega\eta\gamma}$ correlation functions. A comparison
of the results with the values of the coupling constants that are deduced from
the experimentally measured decay widths of $\rho\to \eta\gamma$ and $\omega\to
\eta\gamma$ decays is performed.


title:
Seesaw Neutrino Masses with Large Mixings from Dimensional
  Deconstruction

abstract:
  We demonstrate a dynamical origin for the dimension-five seesaw operator in
dimensional deconstruction models. Light neutrino masses arise from the seesaw
scale which corresponds to the inverse lattice spacing. It is shown that the
deconstructing limit naturally prefers maximal leptonic mixing. Higher-order
corrections which are allowed by gauge invariance can transform the bi-maximal
into a bi-large mixing. These terms may appear to be non-renormalizable at
scales smaller than the deconstruction scale.


title: Study of $B_{s}\to (\eta,\eta',\phi)\ell\bar{\ell}$ Decays

abstract:
  We study the rare decays of $B_{s} \to M_s\ell \bar{\ell}$ ($M_s=\eta,
\eta',\phi$ and $\ell=\nu,e,\mu,\tau$) in the standard model. With the hadronic
form factors evaluated in the light front and constituent quark models, we
estimate the decay branching ratios, respectively. We also discuss the
longitudinal lepton polarization and forward-backward asymmetries.


title:
Branching Ratio and direct CP Asymmetry for $B \to K^{*} \gamma$ Decay
  in MSSM

abstract:
  The present paper deals with a next-to-leading order analysis of the
radiative $B \to K^* \gamma$ decay. Working in the PQCD approach developed by
Szczepaniak {\it et al.}, we compute the correction, coming from a single gluon
exchange with the spectator, to the essential form factor. Since the branching
ratio gets much above the experimental data, although in agreement with other
theoretical models predictions, we take into consideration the effects of
complex flavour couplings in the squark sector. Finally, we discuss these SUSY
implications on the branching ratio and direct CP asymmetry values and impose
bounds on the squark mixing parameter $(\delta_{23}^d)_{LR}$.


title:
Arguments on the Light-mass Scalar Mesons and Concluding Remarks of the
  Meson Sessions

abstract:
  This report attempts to summarize the most interesting (and hopefully
important) results leading up to and including those presented at the recent
Symposium sponsored jointly by the Institute of Quantum Science at Nihon
University and KEK. My task is to present the arguments on light-mass scalar
mesons below 1 GeV from both theory and phenomenological viewpoints, including
the new insight gained on $\pi-\pi$ production and scattering amplitudes.
Specific topics are taken up, particularly on the existence of a
$\sigma$(500-600) as explanation of the twin peak anomaly in $\Upsilon(3S) \to
\Upsilon(1S)\pi\pi$, the status of $J^{PC}=1^{-+}$ states and a possible
crypto-exotic hybrid with $J^{PC}=0^{-+}$ are discussed, as well as the
intriguing enhancement in $p\bar{p}$ radiative decay from $J/\psi$.


title:
Higgs boson couplings to quarks with supersymmetric CP and flavor
  violations

abstract:
  In minimal supersymmetric model (SUSY) with a light Higgs sector, explicit CP
violation and most general flavor mixings in the sfermion sector, integration
of the superpartners out of the spectrum induces potentially large
contributions to the Yukawa couplings of light quarks via those of the heavier
ones. These corrections can be sizeable even for moderate values of tan(beta),
and remain nonvanishing even if all superpartners decouple. When the SUSY
breaking scale is close to the electroweak scale, the Higgs exchange effects
can compete with the gauge boson and box diagram contributions to rare
processes, and their partial cancellations can lead to relaxation of the
existing bounds on flavor violation sources. In this case there exist sizeable
enhancements in flavor-changing Higgs decays. When the superpartners completely
decouple, however, the Higgs mediation becomes the dominant SUSY contribution
to rare processes the saturation of which, without a strong suppression of the
flavor mixings, prefers large tan(beta) and certain ranges for the CP-odd
phases. The decay rate of the lightest Higgs into light down quarks become
comparable with that into the bottom quark. Moreover, the Higgs decay into the
up quark is significantly enhanced. There are observable implications for rare
processes, atomic electric dipole moments, and collider searches for Higgs
bosons.