title: Probing neutrino masses with future galaxy redshift surveys

abstract:
  We perform a new study of future sensitivities of galaxy redshift surveys to
the free-streaming effect caused by neutrino masses, adding the information on
cosmological parameters from measurements of primary anisotropies of the cosmic
microwave background (CMB). Our reference cosmological scenario has nine
parameters and three different neutrino masses, with a hierarchy imposed by
oscillation experiments. Within the present decade, the combination of the
Sloan Digital Sky Survey (SDSS) and CMB data from the PLANCK experiment will
have a 2-sigma detection threshold on the total neutrino mass close to 0.2 eV.
This estimate is robust against the inclusion of extra free parameters in the
reference cosmological model. On a longer term, the next generation of
experiments may reach values of order sum m_nu = 0.1 eV at 2-sigma, or better
if a galaxy redshift survey significantly larger than SDSS is completed. We
also discuss how the small changes on the free-streaming scales in the normal
and inverted hierarchy schemes are translated into the expected errors from
future cosmological data.


title: QCD Corrections to Jet Correlations in Weak Boson Fusion

abstract:
  Higgs boson production via weak boson fusion is sensitive to the tensor
structure of the HVV (V=W,Z) couplings, which distinguishes loop induced
vertices from SM expectations. At the CERN Large Hadron Collider this
information shows up most clearly in the azimuthal angle correlations of the
two forward and backward quark jets which are typical for weak boson fusion. We
calculate the next-to-leading order QCD corrections to this process, in the
presence of anomalous HVV couplings. Gluon emission does not significantly
change the azimuthal jet correlations.


title: Suppressed supersymmetry breaking terms in the Higgs sector

abstract:
  We study the little hierarchy between mass parameters in the Higgs sector and
other SUSY breaking masses. This type of spectrum can relieve the fine-tuning
problem in the MSSM Higgs sector. Our scenario can be realized by
superconformal dynamics. The spectrum in our scenario has significant
implications in other phenomenological aspects like the relic abundance of the
lightest neutralino and relaxation of the unbounded-from-below constraints.


title:
On The Injection Spectrum of Ultrahigh Energy Cosmic Rays in the
  Top-Down Scenario

abstract:
  We analyze the uncertainties involved in obtaining the injection spectra of
UHECR particles in the top-down scenario of their origin. We show that the
DGLAP $Q^2$ evolution of fragmentation functions (FF) to $Q=M_X$ (mass of the X
particle) from their initial values at low $Q$ is subject to considerable
uncertainties. We therefore argue that, for $x\lsim 0.1$ (the $x$ region of
interest for most large $M_X$ values of interest, $x\equiv 2E/M_X$ being the
scaled energy variable), the FF obtained from DGLAP evolution is no more
reliable than that provided, for example, by a simple Gaussian form (in the
variable $\ln(1/x)$) obtained under the Modified Leading Log Approximation
(MLLA). Additionally, we find that for $x\gsim0.1$, the evolution in $Q^2$ of
the singlet FF, which determines the injection spectrum, is ``minimal'' -- the
singlet FF changes by barely a factor of 2 after evolving it over $\sim$ 14
orders of magnitude in $Q\sim M_X$. We, therefore, argue that as long as the
measurement of the UHECR spectrum above $\sim10^{20}\ev$ is going to remain
uncertain by a factor of 2 or larger, it is good enough for most practical
purposes to directly use any one of the available initial parametrisations of
the FFs in the $x$ region $x\gsim0.1$ based on low energy data even without
evolving them to the requisite $Q^2$ value.


title: Warped Higgsless Models with IR--Brane Kinetic Terms

abstract:
  We examine a warped Higgsless $SU(2)_L\times SU(2)_R\times U(1)_{B-L}$ model
in 5--$d$ with IR(TeV)--brane kinetic terms. It is shown that adding a brane
term for the $U(1)_{B-L}$ gauge field does not affect the scale ($\sim 2-3$
TeV) where perturbative unitarity in $W_L^+ W_L^- \to W_L^+ W_L^-$ is violated.
This term could, however, enhance the agreement of the model with the precision
electroweak data. In contrast, the inclusion of a kinetic term corresponding to
the $SU(2)_D$ custodial symmetry of the theory delays the unitarity violation
in $W_L^\pm$ scattering to energy scales of $\sim 6-7$ TeV for a significant
fraction of the parameter space. This is about a factor of 4 improvement
compared to the corresponding scale of unitarity violation in the Standard
Model without a Higgs. We also show that null searches for extra gauge bosons
at the Tevatron and for contact interactions at LEP II place non-trivial bounds
on the size of the IR-brane terms.


title:
Evaluation of Spectra of Baryons Containing Two Heavy Quarks in Bag
  Model

abstract:
  In this work, we evaluate the energy spectra of baryons which consist of two
heavy and one light quarks in the MIT bag model. The two heavy quarks
constitute a heavy scalar or axial vector diquark. Concretely, we calculate the
spectra of $|q(QQ')>_{1/2}$ and $|q(QQ')>_{3/2}$ where $Q$ and $Q'$ stand for
$b$ and/or $c$ quarks. Especially, for $|q(bc)>_{1/2}$ there can be a mixing
between $|q(bc)_0>_{1/2}$ and $|q(bc)_1>_{1/2}$ where the subscripts 0 and 1
refer to the spin state of the diquark (bc), the mixing is not calculable in
the framework of quantum mechanics (QM) as the potential model is employed, but
can be evaluated by the quantum field theory (QFT). Our numerical results
indicate that the mixing is sizeable


title:
Higher order corrections to the Newtonian potential in the
  Randall-Sundrum model

abstract:
  The general formalism for calculating the Newtonian potential in fine-tuned
or critical Randall-Sundrum braneworlds is outlined. It is based on using the
full tensor structure of the graviton propagator. This approach avoids the
brane-bending effect arising from calculating the potential for a point source.
For a single brane, this gives a clear understanding of the disputed overall
factor 4/3 entering the correction. The result can be written on a compact form
which is evaluated to high accuracy for both short and large distances.


title: Higgs Self-Coupling in gamma-gamma Collisions

abstract:
  To establish the Higgs mechanism experimentally, one has to determine the
Higgs self-interaction potential responsible for the electroweak symmetry
breaking. This requires a measurement of the trilinear and quadrilinear
self-couplings of the Higgs particle, as predicted by the Standard Model (SM).
We propose to measure the trilinear Higgs self-coupling in gamma-gamma
collisions just above the kinematic threshold E_thr = 2M_H, where M_H is the
Higgs mass. Our calculation reveals that the sensitivity of the cross-section
sigma(gamma gamma -> HH) to the Higgs self-coupling is maximal near the 2M_H
threshold for M_H = 115-150 GeV, and is larger than the sensitivities of
sigma(e+e- -> ZHH) and sigma(e+e- -> nu nu HH) to this coupling for 2E_e < 700
GeV. We envisage to (a) study gamma gamma -> H by constructing an X-band e-e-
linac and a terawatt laser system in order to produce Compton-scattered
gamma-ray beams for a 160-GeV photon collider (2E_e = 200 GeV); (b) add a
positron source and repeat all measurements done at LEP and SLC with much
better precision; and (c) subsequently install 70-MeV/m rf cavities in order to
study e+e- -> H+Z, e+e- -> tt and gamma gamma -> H+H at 2E_e = 350 GeV. The
total length of the linac would be about 7 km.


title:
Worldline Variational Approximation: A New Approach to the Relativistic
  Binding Problem

abstract:
  We determine the lowest bound-state pole of the density-density correlator in
the scalar Wick-Cutkosky model where two equal-mass constituents interact via
the exchange of mesons. This is done by employing the worldline representation
of field theory together with a variational approximation as in Feynman's
treatment of the polaron. Unlike traditional methods based on the
Bethe-Salpeter equation, self-energy and vertex corrections are (approximately)
included as are crossed diagrams. Only vacuum-polarization effects of the heavy
particles are neglected. The well-known instability of the model due to
self-energy effects leads to large qualitative and quantitative changes
compared to traditional approaches which neglect them. We determine numerically
the critical coupling constant above which no real solutions of the variational
equations exist anymore and show that it is smaller than in the one-body case
due to an induced instability. The width of the bound state above the critical
coupling is estimated analytically.


title:
Neutrino masses and mixing: Singular mass matrices and Quark-lepton
  symmetry

abstract:
  We suggest an approach to explain the observed pattern of the neutrino masses
and mixing which employs the weakly broken quark-lepton symmetry and does not
require introduction of an ad hoc symmetry of the neutrino sector. The mass
matrices are nearly equal for all quarks and leptons. They have very small
determinants and hierarchical form with expansion parameter lambda = 0.26. The
latter can be realized, e.g., in the model with U(1) family symmetry. The
symmetry is broken at the lambda^2 level. Large lepton mixing appears as a
result of summation of the neutrino and charged lepton rotations which
diagonalize the mass matrices in contrast with quark sector where the up quarks
and down quarks rotations cancel each other. We show that the flip of the sign
of rotation in the lepton sector is a result of the seesaw mechanism which also
enhances the neutrino mixing. In this approach one expects, in general,
deviation of the 2-3 mixing from maximal, s_{13} \sim (1-3) lambda^2,
hierarchical neutrino mass spectrum, and m_{ee} < 10^{-2} eV. The scenario is
consistent with the thermal leptogenesis and (in SUSY context) bounds on lepton
number violating processes, like mu to e gamma.


title:
The NuTeV Anomaly, Lepton Universality, and Non-Universal Neutrino-Gauge
  Couplings

abstract:
  In previous studies we found that models with flavor-universal suppression of
the neutrino-gauge couplings are compatible with NuTeV and Z-pole data. In this
paper we expand our analysis to obtain constraints on flavor-dependent coupling
suppression by including lepton universality data from W, tau, pi and K decays
in fits to model parameters. We find that the data are consistent with a
variety of patterns of coupling suppression. In particular, in scenarios in
which the suppression arises from the mixing of light neutrinos with heavy
gauge singlet states (neutrissimos), we find patterns of flavor-dependent
coupling suppression which are also consistent with constraints from mu -> e
gamma.


title:
Single production of excited electrons at future e^-e^+, ep and pp
  colliders

abstract:
  We analyzed the potential of the LC with $\sqrt{s}=0.5$ TeV, LC$\times$LHC
based ep collider with $\sqrt{s}=3.74$ TeV and LHC with $\sqrt{s}=14$ TeV to
search for excited electrons through transition magnetic type couplings with
gauge bosons. The $e^{\star}\to e\gamma$ signal and corresponding backgrounds
are studied in detail.


title: Star tracks in the ghost condensate

abstract:
  We consider the infrared modification of gravity by ghost condensate.
Naively, in this scenario one expects sizeable modification of gravity at
distances of order 1000 km, provided that the characteristic time scale of the
theory is of the order of the Hubble time. However, we argue that this is not
the case. The main physical reason for the conspiracy is a simple fact that the
Earth (and any other object in the Universe) has velocity of at least of order
10^{-3}c with respect to the rest frame of ghost condensate. Combined with
strong retardation effects present in the ghost sector, this fact implies that
no observable modification of the gravitational field of nearby objects occurs.
Instead, the physical manifestation of ghost condensate is the presence of
``star tracks'' -- narrow regions of space with growing gravitational and ghost
fields inside -- along the trajectory of any massive object. We briefly discuss
the possibilities to observe these tracks.


title: Can One Phase Induce All CP Violations Including Leptogenesis?

abstract:
  In the framework of a SUSY SO(10) model a phase is generated spontaneously
for the B-L breaking VEV. Fitting this phase to the observed CP violating K,B
decays all other CP breaking effects are uniquely predicted. In particular, the
amount of Leptogenesis can be explicitly calculated and found to be in the
right range and sign for the BAU.


title: Effect of Supersymmetric Right-handed Flavor Mixing on $B_s$ decays

abstract:
  Motivated by the possibility of ${\cal S}_{\phi K_S}<0$, we study the
implications for $B_s$ meson system. In a specific model that realizes ${\cal
S}_{\phi K_S}<0$ with large $s$-$b$ mixing, right-handed dynamics and a new CP
phase, we present predictions for CP asymmetries in $B_s\to J/\psi\phi$,
$K^+K^-$ and $\phi\gamma$ decays. Even if the measurement of time-dependent CP
asymmetry becomes hampered by very fast $B_s$ oscillation, a finite difference
between the decay rates of $B_s$ mass eigenstates may enable the studies of CP
violations with untagged data samples. Thus, studies of CP violation in the
$B_s$ system would remain useful for the extraction of new physics information.


title: Baryon Number Violation in tau, D and B Decays

abstract:
  This paper has been withdrawn by the authors due to the crucial wrong
assumption following Eq. 9.


title: LCSR analysis of exclusive two-body B decay into charmonium

abstract:
  We analyze B -> K H_c (where H_c = eta_c, J/psi, chi_{cJ(J=0,1)}) decays
estimating nonfactorizable contributions from the light-cone sum rules (LCSR).
Nonfactorizable contributions are sizable for B -> K J/psi and particularly for
B -> K chi_{c1} decay. For the B decays into a (pseudo)scalar charmonia we find
small nonfactorizable contributions which cannot accommodate relatively large
branching ratios obtained by measurements. This specially concerns the puzzling
B -> K chi_{c0} decay.


title: <VAP> Green Function in the Resonance Region

abstract:
  We analyse the <VAP> three-point function of vector, axial-vector and
pseudoscalar currents. In the spirit of large N_C, a resonance dominated Green
function is confronted with the leading high-energy behaviour from the operator
product expansion. The matching is shown to be fully compatible with a chiral
resonance Lagrangian and it allows to determine some of the chiral low-energy
constants of O(p^6).


title: SU(3)_c X SU(4)_L X U(1)_x model for three families

abstract:
  An extension of the Standard Model to the local gauge group $SU(3)_c\otimes
SU(4)_L\otimes U(1)_X$ as a three-family model is presented. The model does not
contain exotic electric charges and we obtain a consistent mass spectrum by
introducing an anomaly-free discrete $Z_2$ symmetry. The neutral currents
coupled to all neutral vector bosons in the model are studied. By using
experimental results from the CERN LEP, SLAC Linear Collider and atomic parity
violation we constrain the mixing angle between two of the neutral currents in
the model and the mass of the additional neutral gauge bosons to be
$-0.0032\leq\sin\theta\leq 0.0031$ and $0.67 \hbox{TeV}\leq M_{Z_2} \leq 6.1$
TeV at 95% C.L., respectively.


title: Anomalous gauge-boson couplings and the Higgs-boson mass

abstract:
  We study anomalous gauge-boson couplings induced by a locally SU(2) x U(1)
invariant effective Lagrangian containing ten operators of dimension six built
from the boson fields of the Standard Model (SM) before spontaneous symmetry
breaking (SSB). After SSB some operators lead to new three- and
four-gauge-boson interactions, some contribute to the diagonal and off-diagonal
kinetic terms of the gauge bosons and to the mass terms of the W and Z bosons.
This requires a renormalisation of the gauge-boson fields, which, in turn,
modifies the charged- and neutral-current interactions, although none of the
additional operators contain fermion fields. Bounds on the anomalous couplings
from electroweak precision measurements at LEP and SLD are correlated with the
Higgs-boson mass m_H. Rather moderate values of anomalous couplings allow m_H
up to 500 GeV. At a future linear collider the triple-gauge-boson couplings
gammaWW and ZWW can be measured in the reaction e+e- --> WW. We compare three
approaches to anomalous gauge-boson couplings: the form-factor approach, the
addition of anomalous coupling terms to the SM Lagrangian after and, as
outlined above, before SSB. The translation of the bounds on the couplings from
one approach to another is not straightforward. We show that it can be done for
the process e+e- --> WW by defining new effective ZWW couplings.


title: Pentaquark baryons with Charm

abstract: This paper has been withdrawn.


title:
Solution of the Kwiecinski evolution equations for unintegrated parton
  distributions using the Mellin transform

abstract:
  The Kwiecinski equations for the QCD evolution of the unintegrated parton
distributions in the transverse-coordinate space (b) are analyzed with the help
of the Mellin-transform method. The equations are solved numerically in the
general case, as well as in a small-b expansion which converges fast for b
Lambda_QCD sufficiently small. We also discuss the asymptotic limit of large bQ
and show that the distributions generated by the evolution decrease with b
according to a power law. Numerical results are presented for the pion
distributions with a simple valence-like initial condition at the low scale,
following from chiral large-N_c quark models. We use two models: the Spectral
Quark Model and the Nambu--Jona-Lasinio model. Formal aspects of the equations,
such as the analytic form of the b-dependent anomalous dimensions, their
analytic structure, as well as the limits of unintegrated parton densities at x
-> 0, x -> 1, and at large b, are discussed in detail. The effect of spreading
of the transverse momentum with the increasing scale is confirmed, with
<k_\perp^2> growing asymptotically as Q^2 alpha(Q^2). Approximate formulas for
<k_\perp^2> for each parton species is given, which may be used in practical
applications.


title: Testing the Standard Model with Bs-> K^+ K^- Decays

abstract:
  In the limit of flavor SU(3) symmetry, the amplitudes for Bd->pi^+\pi^- and
Bs-> K^+ K^- are related to one another. Taking the values of the weak phases
beta and gamma from independent measurements, the ratio Rds=BR(Bs->
K^+K^-)/BR(Bd->pi^+ pi^-) and the two Bd->pi^+pi^- CP asymmetries Adir and Amix
depend on only two quantities. By measuring these three observables, one can
test for the presence of physics beyond the standard model. In this paper,
using present data, and including theoretical uncertainties due to SU(3)
breaking, we perform such an analysis. The experimental errors are still very
large, but with improved measurements from Babar, Belle and CDF this will be a
useful method to search for new physics.


title:
Model-independent assessment of current direct searches for
  spin-dependent dark matter

abstract:
  I evaluate the current results of spin-dependent weakly interacting massive
particle (WIMP) searches within a model-independent framework, showing the most
restrictive limits to date derive from the combination of xenon and sodium
iodide experiments. The extension of this analysis to the case of positive
signal experiments is elaborated.


title:
Spin observables and the determination of the parity of $\Theta^+$ in
  photoproduction reactions

abstract:
  Spin observables in the photoproduction of the $\Theta^+$ are explored for
the purpose of determining the parity of the $\Theta^+$. Based on reflection
symmetry in the scattering plane, we show that certain spin observables in the
photoproduction of the $\Theta^+$ can be related directly to its parity. We
also show that measurements of both the target nucleon asymmetry and the $%
\Theta^+$ polarization may be useful in determining the parity of $\Theta^+$ in
a model-independent way. Furthermore, we show that no combination of spin
observables involving only the polarization of the photon and/or nucleon in the
initial state can determine the parity of $\Theta^+$ unambiguously.


title: On: Natural Inflation

abstract:
  We re-examine the original model of Natural inflation, in which the inflaton
is a pseudo Nambu-Goldstone boson with potential of the form $ V(\phi) =
\Lambda^4 [1 \pm \cos(\phi/f)]$, in light of recent data. We find that the
model is alive and well. Successful inflation as well as recent data from the
Wilkinson Microwave Anisotropy probe require $f > 0.6 m_{\rm Pl}$ (where
$m_{\rm Pl} = 1.22 \times 10^{19}$ GeV) and $\Lambda \sim m_{GUT}$, scales
which can be accommodated in particle physics models. The detectability of
tensor modes from natural inflation in upcoming microwave background
experiments is discussed. We find that natural inflation predicts a
tensor/scalar ratio within reach of future observations.


title: Higgs Boson Production in Association with Three Jets

abstract:
  The scattering amplitudes for Higgs + 5 partons are computed, with the Higgs
boson produced via gluon fusion in the large top-quark mass limit. A
parton-level analysis of Higgs + 3 jet production via gluon fusion and via
weak-boson fusion is presented, and the effectiveness of a central-jet veto is
analysed.


title:
CPT Violating Decoherence and LSND: a possible window to Planck scale
  Physics

abstract:
  Decoherence has the potential to explain all existing neutrino data including
LSND results, without enlarging the neutrino sector. This particular form of
CPT violation can preserve the equality of masses and mixing angles between
particle and antiparticle sectors, and still provide seizable differences in
the oscillation patterns. A simplified minimal model of decoherence is
sufficient to explain the existing neutrino data quite neatly, while making
dramatic predictions for the upcoming experiments. Some comments on the order
of the decoherence parameters in connection with theoretically expected values
from some models of quantum-gravity are given. In particular, the quantum
gravity decoherence as a primary origin of the neutrino mass differences
scenario is explored, and even a speculative link between the neutrino
mass-difference scale to the dark energy density component of the Universe
today is drawn.


title: Large Mixing from Small: Pseudo-Dirac Neutrinos and the Singular Seesaw

abstract:
  If the sterile neutrino mass matrix in an otherwise conventional seesaw model
has a rank less than the number of flavors, it is possible to produce
pseudo-Dirac neutrinos. In a two-flavor, sterile rank 1 case, we demonstrate
analytic conditions for large active mixing induced by the existence of (and
coupling to) the sterile neutrino components. For the three-flavor, rank 1
case, ``3+2'' scenarios with large mixing also devolve naturally as we show by
numerical examples. We observe that, in this approach, small mass differences
can develop naturally without any requirement that masses themselves are small.
Additionally, we show that significant three channel mixing and limited
experimental resolution can combine to produce extracted two channel mixing
parameters at variance with the actual values.


title:
Direct evidence for the validity of Hurst's empirical law in hadron
  production processes

abstract:
  We propose to use the rescaled range analysis to examine the records of
rapidity-dependence of multiplicities in high-energy collision processes. We
probe event by event the existence of global statistical dependence in the
system of produced hadrons, and demonstrate the effectiveness of the
above-mentioned statistical method by applying it to the cosmic-ray data of the
JACEE collaboration, and by comparing the obtained results with other
experimental results for similar reactions at accelerator and collider
energies. We present experimental evidence for the validity of Hurst's
empirical law, and the evidence for the existence of global statistical
dependence, fractal dimension, and scaling behavior in such systems of hadronic
matter. None of these features is directly related to the basis of the
conventional physical picture. Hence, it is not clear whether (and if yes, how
and why) these striking empirical regularities can be understood in terms of
the conventional theory.


title: Generating extremal neutrino mixing angles with Higgs family symmetries

abstract:
  The existence of maximal and minimal mixing angles in the neutrino mixing
matrix motivates the search for extensions to the Standard Model that may
explain these angles. A previous study (C.I.Low and R.R.Volkas,
Phys.Rev.D68,033007(2003)), began a systematic search to find the minimal
extension to the Standard Model that explains these mixing angles. It was found
that in the minimal extensions to the Standard Model which allow neutrino
oscillations, discrete unbroken lepton family symmetries only generate neutrino
mixing matrices that are ruled out by experiment. This paper continues the
search by investigating all models with two or more Higgs doublets, and an
Abelian family symmetry. It is found that discrete Abelian family symmetries
permit, but cannot explain, maximal atmospheric mixing, however these models
can ensure theta_{13}=0.


title: Radiative decays $J/\Psi\to\eta^{(\prime)}\gamma$ in perturbative QCD

abstract:
  With the recent investigations of $g^{\ast}g^{\ast}-\eta^{(\prime)}$
transition form factor and $\eta-\eta^{\prime}$ mixing scheme, we present an
updated study of the radiative decays $J/\Psi\to\eta^{(\prime)}\gamma$ in
perturbative QCD. The decays are taken as a test ground for the
$g^{\ast}g^{\ast}-\eta^{(\prime)}$ transition form factors and the
$\eta-\eta^{\prime}$ mixing scheme. The form factors are found to be working
for glunic $\eta^{(\prime)}$ productions and the mixing angle is constrained to
be $\phi=35.1^{\circ}\pm0.8^{\circ}$.


title: An Attempt to Study Pentaquark Baryons in String Theory

abstract:
  An attempt to study recently observed Pentaquark baryons is performed in the
dual string theory of QCD. Mass formulae for Pentaquark baryons are naively
estimated in the Maldacena's prototype model for supersymmetric QCD and a more
realistic model for the ordinary QCD.


title: Horizontal symmetry in Higgs sector of GUT with U(1)_A symmetry

abstract:
  In a series of papers, we pointed out that an anomalous $U(1)_A$ gauge
symmetry naturally solves various problems in grand unified theories (GUTs) and
that a horizontal gauge symmetry, $SU(2)_H$ or $SU(3)_H$, not only realizes the
unification of three generation quarks and leptons in fewer multiplets but also
solves the supersymmetric flavor problem. In this paper, we examine the
possibility that the Higgs sectors of the GUT symmetry and of the horizontal
symmetry are unified, that is, there are some Higgs fields whose vacuum
expectation values (VEVs) break both the GUT gauge symmetry and the horizontal
symmetry at the same time. Although the scale of the VEVs become too large to
suppress the flavor changing neutral current processes sufficiently, the
unification is possible. In addition, for the $SU(3)_H$ models, the $SU(3)_H$
gauge anomaly is cancelled in the unified models without introducing additional
fields in contrast with the previous models in which the Higgs sectors are not
unified.


title: Baryonic Regge trajectories with analyticity constraints

abstract:
  A model for baryonic Regge trajectories compatible with the threshold
behavior required by unitarity and asymptotic behavior in agreement with
analyticity constraints is given in explicit form. Widths and masses of the
baryonic resonances on the N and $\Delta$ trajectories are reproduced. The
MacDowell symmetry is exploited and an application is given.


title: Aspects of Non-Equilbrium Quantum Field Theory in Heavy Ion Collisions

abstract:
  In this lecture we review recent progress in various aspects of
non-equilibrium QFT with respect to relativistic heavy ion collisions. As a
first and rather general study we summarize our (numerical) investigations for
a dissipative quantum time evolution of $\phi^4$-field theory for a spatially
homogeneous system in 2+1 space-time dimensions on the basis of the
Kadanoff-Baym equations. The initial conditions can be chosen arbitrarily and
far from equilibrium. The calculations demonstrate how thermalization and
chemical equilibration is achieved ab initio from the underlying QFT. As a
possible candidate for a non-equilibrium phase transition phenomena we then
adress the stochastic formation of disoriented chiral condensates. Finally we
elaborate on a new 3+1 dimensional Monte Carlo parton cascade solving kinetic
Boltzmann processes including inelastic multiplication processes (gg<->ggg) in
an unified manner, where the back reaction channel is treated for the first
time fully consistently.


title: Wrong-Helicity Electrons in Radiative Muon Decay

abstract:
  We have studied in detail the spectrum of the decay mu^- -> e^- anti-nu_e
nu_mu gamma as a function of the electron helicity, and verify the prediction
of Sehgal (Phys.Lett. B569, 25 (2003)) that a significant fraction of the
electrons in this decay is right-handed. These ``wrong-helicity'' electrons
persist in the limit lambda = m_e / m_mu -> 0, and are connected with
helicity-flip bremsstrahlung in QED. The longitudinal polarization of the
electron is calculated as a function of the photon and electron energy, and
deviates systematically from the naive V-A prediction P_L = -1. The
right-handed component is concentrated in the collinear region theta <= m_e /
E_e. In the limit lambda -> 0, we reproduce the results obtained in (Phys.Lett.
B569, 25 (2003)) using the helicity-flip splitting function introduced by Falk
and Sehgal.


title: CP Studies of the Higgs Sector

abstract:
  The CP structure of the Higgs sector will be of great interest to future
colliders. The measurement of the CP properties of candidate Higgs particles
will be essential in order to distinguish models of electroweak symmetry
breaking, and to discover or place limits on CP-violation in the Higgs sector.
In this report we briefly summarize various methods of determining the CP
properties of Higgs bosons at different colliders and identify areas where more
study is required. We also provide an example of a synergy between the LHC, an
e+e- Linear Collider and a Photon Collider, for the examination of CP-violation
in a Two-Higgs-Doublet-Model.


title: Sensitivity of Supersymmetric Dark Matter to the b Quark Mass

abstract:
  An analysis of the sensitivity of supersymmetric dark matter to variations in
the b quark mass is given. Specifically we study the effects on the neutralino
relic abundance from supersymmetric loop corrections to the mass of the b
quark. It is known that these loop corrections can become significant for large
$\tan\beta$. The analysis is carried out in the framework of mSUGRA and we
focus on the region where the relic density constraints are satisfied by
resonant annihilation through the s-channel Higgs poles. We extend the analysis
to include CP phases taking into account the mixing of the CP-even and CP-odd
Higgs boson states which play an important role in determining the relic
density. Implications of the analysis for the neutralino relic density
consistent with the recent WMAP relic density constraints are discussed.


title: Are gluons massive ?

abstract:
  It is claimed that only one gluon is massless and the other seven gluons are
massive. Out of eight gluons, six are colored and two are neutral. Among
neutral gluons, one is massless and other one is massive. Massive neutral gluon
is heavier than the colored gluons. Gluons can only be predicted by set theory
but not by SU(3).


title:
Two new sum rules for octet-baryon magnetic moments (\mu) and
  constraints on QCD sum rules from new experimental determination of \mu-s for
  the decuplet

abstract:
  Recently the \mu_{\Delta ^{++}} was found from a fit to (\pi^+)p scattering.
This enable us to pinpoint condensate parameters more precisely in the context
of QCD sum rules (QCDSR).
  In the octet sector, the Coleman-Glashow sum rule (CGSR) is violated by the
experimental \mu-s. QCDSR allows us to write down two sum rules similar to the
CGSR, which are obeyed by the experimental magnetic moments, whereas they rule
out a specific model using the Wilson loop approach and a particular chiral
quark model.
  It is amusing to note that the QCDSR allows us to write down the quark and
gluon condensates in terms of measurables like the \mu-s of the nucleons and
the \Sigma^{+/-}.


title:
Branching ratio and CP asymmetry of $B_s \to \pi^+ \pi^-$ decays in the
  perturbative QCD approach

abstract:
  In this paper, we calculate the decay rate and CP asymmetry of the $B_s \to
\pi^+\pi^-$ decay in perturbative QCD approach with Sudakov resummation. Since
none of the quarks in final states is the same as those of the initial $B_s$
meson, this decay can occur only via annihilation diagrams in the standard
model. Besides the current-current operators, the contributions from the QCD
and electroweak penguin operators are also taken into account. We find that (a)
the branching ratio is about $4 \times 10^{-7}$; (b) the penguin diagrams
dominate the total contribution; and (c) the direct CP asymmetry is small in
size: no more than $3% $; but the mixing-induced CP asymmetry can be as large
as ten percent testable in the near future LHC-b experiments.


title: Late Leptogenesis from Radiative Soft Terms

abstract:
  We point out that the so-called ``soft leptogenesis'' can occur at TeV scale
if the $B$ term is generated through radiative corrections which involve
two-loop diagrams with the gaugino exchange. This mechasnism requires the
non-trivial CP phase, ${Im}(A m_{1/2}^*)\neq 0$, and can naturally explain the
observed baryon asymmetry of the universe associated with the TeV scale seesaw
mechanism. Such a low scale leptogenesis would be a promising option in view of
the tight upper limit on the reheat temperature avoiding the gravitino problem
in supergravity models.


title: Cosmic Ray Spectrum and Tachyonic Neutrino

abstract:
  In the cosmic ray spectrum, there are two knees (abrupt changes of slopes)
located around the energies $E_{th}=10^{15.5}$ eV and $10^{17.8}$ eV
respectively. Based on the pioneering work by Kostelecky and Ehrlich, we
ascribe the first knee to a sudden opening of the reaction channel
$\tilde{\nu}_e+p\to n+e^+$ when the proton has a velocity just exceeding a
critical value and so can absorb a tachyonic neutrino $\nu_e$ in the form of an
antineutrino $\tilde{\nu}_e$. Similarly, the second knee is triggered by the
reaction $\tilde{\nu}_\mu+p\to \Lambda+\mu^+$. The fitting of these two values
of $E_{th}$ gives the tachyon mass of $\nu_e$ and $\nu_\mu$ being 0.54 eV/$c^2$
and 0.48 eV/$c^2$ respectively, which are in favor of a minimal three-flavor
model for tachyonic neutrino with one parameter $\delta$ being estimated to be
$\delta=0.34$ eV.


title:
Detecting the non-universal gauge boson $Z^{'}$ at high-energy
  $e^{+}e^{-}$ collider

abstract:
  In the context of topcolor-assisted techicolor($TC2$) models, we investigate
the feasibility of detecting the non-universal gauge boson $Z^{'}$ in the
future high-energy linear $e^{+}e^{-}$ collider($LC$) experiments by performing
$\chi^{2}$ analysis via studying its virtual effects on the processes
$e^{+}e^{-}\to f\bar{f}$ with $f=\tau$, $\mu$, b, and c. We find that the
non-universal gauge boson $Z^{'}$ is most sensitive to the process
$e^{+}e^{-}\to \tau\bar{\tau}$. Discovery limits of the $Z^{'}$ mass
$M_{Z^{'}}$ can be enhanced by the suitably polarized beams. If we assume that
polarization of electron beam and positron beam are 80% and 60%, the $LC$
experiment with $\sqrt{s}=500GeV$ and $\pounds_{int}=340fb^{-1}$ can explore
$M_{Z^{'}}$ up to 8$TeV$ for the coupling parameter $K_{1}\leq$0.8 at 95% $CL$.


title:
Exclusive semileptonic B_s decays to excited D_s mesons: Search of
  D_{sJ}(2317) and D_{sJ}(2460)

abstract:
  We study the exclusive semileptonic decays B_s->D_{s0}^*\ell\bar\nu and
B_s->D_{s1}^*\ell\bar\nu, where p-wave excited D_{s0}^* and D_{s1}^* states are
identified with the newly observed D_{sJ}(2317) and D_{sJ}(2460) states. Within
the framework of HQET the Isgur-Wise functions up to the subleading order of
the heavy quark expansion are calculated by QCD sum rules. The decay rates and
branching ratios are computed with the inclusion of the order of 1/m_Q
corrections. We point out that the investigation of the B_s semileptonic decays
to excited D_s mesons may provide some information about the nature of the new
D_{sJ}^* mesons.


title: Electroweak baryogenesis and primordial hypermagnetic fields

abstract:
  The origin of the matter-antimatter asymmetry of the universe remains one of
the outstanding questions yet to be answered by modern cosmology and also one
of only a handful of problems where the need of a larger number of degrees of
freedom than those contained in the standard model (SM) is better illustrated.
An appealing scenario for the generation of baryon number is the electroweak
phase transition that took place when the temperature of the universe was about
100 GeV. Though in the minimal version of the SM, and without considering the
interaction of the SM particles with additional degrees of freedom, this
scenario has been ruled out given the current bounds for the Higgs mass, this
still remains an open possibility in supersymmetric extensions of the SM. In
recent years it has also been realized that large scale magnetic fields could
be of primordial origin. A natural question is what effect, if any, these
fields could have played during the electroweak phase transition in connection
to the generation of baryon number. Prior to the electroweak symmetry breaking,
the magnetic modes able to propagate for large distances belonged to the U(1)
group of hypercharge and hence receive the name of hypermagnetic fields. In
this contribution, we summarize recent work aimed to explore the effects that
these fields could have introduced during a first order electroweak phase
transition. In particular, we show how these fields induce a CP asymmetric
scattering of fermions off the true vacuum bubbles nucleated during the phase
transition. The segregated axial charge acts as a seed for the generation of
baryon number. We conclude by mentioning possible research venues to further
explore the effects of large scale magnetic fields for the generation of the
baryon asymmetry.


title:
Mellin Representation for the Heavy Flavor Contributions to Deep
  Inelastic Structure Functions

abstract:
  We derive semi--analytic expressions for the analytic continuation of the
Mellin transforms of the heavy flavor QCD coefficient functions for neutral
current deep inelastic scattering in leading and next-to-leading order to
complex values of the Mellin variable $N$. These representations are used in
Mellin--space QCD evolution programs to provide fast evaluations of the heavy
flavor contributions to the structure functions $F_2(x,Q^2), F_L(x,Q^2)$ and
$g_1(x,Q^2)$.


title: Optical theorem and the cutting rules

abstract: The contents of this manuscript has been moved to hep-ph/0412204.


title: Small Gluonic Spots in the Nucleon: Searching for Signatures in Data

abstract:
  Nuclear shadowing and color glass condensate are possible only at
sufficiently small x where parton clouds of different nucleons overlap in the
longitudinal direction. Another condition vital for these effect, an overlap of
partons in impact parameters, is not easy to fulfill for gluons which are
located within small spots, as follows from the observed weakness of
diffractive gluon radiation (smallness of the triple-Pomeron coupling). The
predicted weakness of the leading twist gluon shadowing has been confirmed
recently by data for J/Psi production and Cronin effect in d-Au collisions at
RHIC. Smallness of gluonic spots also leads to a rather low value of the slope
of the Pomeron trajectory, confirmed by ZEUS data on elastic photoproduction of
J/Psi. At the same time, saturation of unitarity for central pp collisions
leads to a substantial increase of the Pomeron slope in good agreement with
elastic pp data.


title:
Estimations of $\bar{\Omega}^+/\Omega^-$ at RHIC from a QGP Model with
  Diquarks

abstract:
  Assuming that axial-vector and scalar diquarks exist in the Quark-Gluon
Plasma near the critical temporature $T_c$, baryons can be produced from
quark-diquark interactions. In RHIC conditions ($\sqrt{s_{NN}} = 130GeV$ and
$200GeV$), the ratio $\bar{\Omega}^+/\Omega^-$ may be larger than 1, based on
the concept that QGP with diquarks would exist. This unusual result might be a
helpful evidence for QGP existing in RHIC.


title: Low-scale leptogenesis and soft supersymmetry breaking

abstract:
  We investigate the possibility of low-scale leptogenesis in the minimal
supersymmetric standard model extended with right handed (s)neutrinos. We
demonstrate that successful leptogenesis can be easily achieved at a scale as
low as ~ TeV where lepton number and CP violation comes from soft supersymmetry
breaking terms. The scenario is shown to be compatible with neutrino masses
data.


title: Associated Production of Bottomonia and Higgs Bosons at Hadron Colliders

abstract:
  We study the associated production of bottomonia and Higgs bosons at hadron
colliders within the factorization formalism of nonrelativistic quantum
chromodynamics providing all contributing partonic cross sections in analytic
form. While such processes tend to be suppressed in the standard model, they
may have interesting cross sections in its minimal supersymmetric extension,
especially at large values of tan(beta), where the bottom Yukawa couplings are
enhanced. We present numerical results for the processes involving the lighter
CP-even h^0 boson and the CP-odd A^0 boson appropriate for the Fermilab
Tevatron and the CERN LHC.


title:
Instanton effects in quark form factor and quark-quark scattering at
  high energy

abstract:
  The nonperturbative effects in the high-energy processes involving strongly
interacting particles are studied within the instanton liquid model of the QCD
vacuum (ILM) by using the Wilson integral framework. The detailed analysis of
nonperturbative contributions to the electromagnetic quark form factor is
presented considering the structure of the instanton induced effects in the
evolution equation describing the high energy behaviour of the form factor. It
is shown that the instantons yield in high energy limit the logarithmic
corrections to the amplitudes which are exponentiated in small instanton
density parameter. By using the Gaussian interpolation of the constrained
instanton solution, we show that the all-order multi-instanton contribution is
well approximated by the weak field limit result. The role of the instantons in
high energy diffractive quark-quark scattering, in particular, in formation of
the soft Pomeron, is also considered. We show that within the ILM the C-odd
diffractive amplitude is suppressed as 1/s compared to the C-even one. The
further applications of the developed approach in studying the nonperturbative
effects in high energy hadronic processes are briefly discussed.


title: Collider Phenomenology of Light Strange-beauty Squarks

abstract:
  Strong mixing between right-handed strange and beauty squarks is a possible
solution to the CP violation discrepancy in $B\to \phi K_S$ decay as recently
suggested by the Belle data. In this scenario, thanks to the strong mixing one
of the strange-beauty squarks can be as light as 200 GeV, even though the
generic supersymmetry scale is at TeV.
  In this work, we study the production of this light right-handed
strange-beauty squark at hadronic colliders and discuss the detection in
various decay scenarios. Detection prospect at the Tevatron Run II is good for
the strange-beauty squark mass up to about 300 GeV.


title: Toward precision measurements in solar neutrinos

abstract:
  Solar neutrino physics enters a stage of precision measurements. In this
connection we present a precise analytic description of the neutrino conversion
in the context of LMA MSW solution of the solar neutrino problem. Using the
adiabatic perturbation theory we derive an analytic formula for the $\nu_e$
survival probability which takes into account the non-adiabatic corrections and
the regeneration effect inside the Earth. The probability is averaged over the
neutrino production region. We find that the non-adiabatic corrections are of
the order $10^{-9}-10^{-7}$. Using the formula for the Earth regeneration
effect we discuss features of the zenith angle dependence of the $\nu_e$ flux.
In particular, we show that effects of small structures at the surface of the
Earth can be important.


title: Cuba - a library for multidimensional numerical integration

abstract:
  The Cuba library provides new implementations of four general-purpose
multidimensional integration algorithms: Vegas, Suave, Divonne, and Cuhre.
Suave is a new algorithm, Divonne is a known algorithm to which important
details have been added, and Vegas and Cuhre are new implementations of
existing algorithms with only few improvements over the original versions. All
four algorithms can integrate vector integrands and have very similar Fortran,
C/C++, and Mathematica interfaces.


title: The quark-gluon Mixed Condensate calculated via Field Correlators

abstract:
  The quark-gluon mixed condensate $g<\bar q \sigma_{\mu\nu} F_{\mu\nu} q>$ is
calculated in the Gaussian approximation of the Field Correlator Method. In the
large N_c limit and for zero mass quarks one obtains a simple result, $m^2_0
\equiv \frac{g<\bar q \sigma_{\mu\nu} F_{\mu\nu} q>}{<\bar q q>} =
\frac{16\sigma}{\pi}$, where $\sigma$ is the string tension. For a standard
value $\sigma=0.18 GeV^2$ one obtains $m^2_0=1 GeV^2$ in good agreement with
the QCD sum rules estimate $m^2_0 = (0.8\pm 0.2) GeV^2$ and the latest lattice
result $m^2_0 \cong 1 GeV^2$.


title: Top Background Extrapolation for H -> WW Searches at the LHC

abstract:
  A leading order (LO) analysis is presented that demonstrates that key top
backgrounds to H -> W^+W^- -> l^\pm l^\mp \sla{p}_T decays in weak boson fusion
(WBF) and gluon fusion (GF) at the CERN Large Hadron Collider can be
extrapolated from experimental data with an accuracy of order 5% to 10%. If LO
scale variation is accepted as proxy for the theoretical error, parton level
results indicate that the tt~j background to the H -> WW search in WBF can be
determined with a theoretical error of about 5%, while the tt~ background to
the H -> WW search in GF can be determined with a theoretical error of better
than 1%. Uncertainties in the parton distribution functions contribute an
estimated 3% to 10% to the total error.


title:
Relation between the neutrino and quark mixing angles and grand
  unification

abstract:
  We argue that there exists simple relation between the quark and lepton
mixings which supports the idea of grand unification and probes the underlying
robust bi-maximal fermion mixing structure of still unknown flavor physics. In
this framework the quark mixing matrix is a parameter matrix describing the
deviation of neutrino mixing from exactly bi-maximal, predicting
theta_{sol}+theta_C=pi/4, where theta_C is the Cabibbo angle,
theta_{atm}+theta_{23}^{CKM}=pi/4 and theta_{13}^{MNS} ~ theta_{13}^{CKM} ~
O(lambda^3), in a perfect agreement with experimental data. Both non-Abelian
and Abelian flavor symmetries are needed for such a prediction to be realistic.
An example flavor model capable to explain this flavor mixing pattern, and to
induce the measured quark and lepton masses, is outlined.


title: A topological view on baryon number conservation

abstract:
  We argue that the charge fractionalization in quarks has a hidden topological
character related to a broken ${\cal Z}_2$ symmetry between integer-charged
bare quarks and leptons. The mechanism is a tunneling process occurring in time
between standard field configurations of a pure gauge form with different
topological winding numbers associated with integer-charged bare quarks in the
far past and future. This transition, which nonperturbatively normalizes local
bare charges with a universal accumulated value, corresponds to a specific
topologically nontrivial configuration of the weak gauge fields in Euclidean
spacetime. The outcome is an effective topological charge equal to the ratio
between baryon number and the number of fermion generations associated with
baryonic matter. The observed conservation of baryon number is then related to
the conservation of this bookkeeping charge on quarks. Baryon number violation
may only arise through topological effects as in decays induced by electroweak
instantons. However, stability of a free proton is expected.


title: Chiral Multiplets in Hadronic Physics

abstract:
  We consider the multiplet structures, appearing in hadronic physics. The
basic types of the multiplets revealed are parity doublets, chiral multiplets,
and multispin-parity clusters. We elucidate a new type of isospin
supermultiplets in the baryon sector. The creation of parity doublets, chiral
multiplets and their interrelation with multispin-parity clusters has been
uncovered. The role of chiral symmetry breaking and restoration in the
formation of the hadronic spectra has been scrutinized.


title:
Top squark mass: current limits revisited and new limits from Tevatron
  Run-I

abstract:
  Analyzing the $\ell +n$-$jets+ \met$ (where $n \ge 2 $), data from Run-I of
the Tevatron using the Bayesian technique, we obtain model independent limits
on the product $\br(\lstop\ra be^{+}\nu_e \lspone) \times \br(\lstop^{*}\ra
\bar{b}q\bar{q^{\prime}}\lspone)$ for different values of the lighter top
squark($\lstop$) mass and the lightest supersymmetric particle($\lspone$) mass.
The SUSY signals have been simulated by interfacing the 4-body decay of
$\lstop$ at the parton level with the event generator PYTHIA. These limits have
been translated into exclusion plots in the $\mlstop$-$\mlspone$ plane, which
also turn out to be fairly model independent for fixed values of the BR of the
competing loop decay mode $\lstop\ra c \lspone$. Assuming the loop decay BR to
be negligible and using the leading order cross section for $\lstoplstop$ pair
production, we obtain conservatively $\mlstop \ge $77.0 (74.5) GeV for
$\mlspone$=5(15) GeV, while for $\br(\lstop\ra c \lspone)$=20%, the
corresponding limits are $\mlstop \ge $68.0 (65.0) GeV. Using the larger next
to leading order cross-section stronger limits are obtained. For example, if
$\br(\lstop\ra c \lspone)$=20%, $\mlstop \ge $73.0 (72.7) GeV for
$\mlspone$=5(15) GeV. Our limits nicely complement the ALEPH bounds which get
weaker for low $\mlspone$.


title: $B$ meson wave function in $k_T$ factorization

abstract:
  We study the asymptotic behavior of the $B$ meson wave function in the
framework of $k_T$ factorization theorem. We first construct a definition of
the $k_T$-dependent $B$ meson wave function, which is free of light-cone
divergences. Next-to-leading-order corrections are then calculated based on
this definition. The treatment of different types of logarithms in the above
corrections, including the Sudakov logarithms, and those depending on a
renormalization scale and on an infrared regulator, is summarized. The
criticism raised in the literature on our resummation formalism and Sudakov
effect is responded. We show that the $B$ meson wave function remains
normalizable after taking into account renormalization-group evolution effects,
contrary to the observation derived in the collinear factorization theorem.


title: Ground-state baryon masses in the perturbative chiral quark model

abstract:
  Mass differences of the flavor octet and decuplet ground-state baryons are
studied in the perturbative chiral quark model. We present a way to understand
the nontrivial spin- and flavor dependent mass differences, where both
pseudoscalar mesons and gluons play a significant role.


title: Particle Dark Matter - A Theorist's Perspective

abstract:
  Dark matter is presumably made of some new, exotic particle that appears in
extensions of the Standard Model. After giving a brief overview of some popular
candidates, I discuss in more detail the most appealing case of the
supersymmetric neutralino.


title: Generalized sum rules of the nucleon in the constituent quark model

abstract:
  We study the generalized sum rules and polarizabilities of the nucleon in the
framework of the hypercentral constituent quark model. We include in the
calculation all the well known $3^*$ and $4^*$ resonances and consider all the
generalized sum rules for which there are data available. To test the model
dependence of the calculation, we compare our results to the results obtained
in the harmonic oscillator CQM. We furthermore confront our results to the
model-independent sum rules values and to the predictions of the
phenomenological MAID model. The CQM calculations provide a good description of
most of the presented generalized sum rules in the intermediate $Q^2$ region
(above $\sim0.2$ GeV$^2$) while they encounter difficulties in describing these
observables at low $Q^2$, where the effects of the pion cloud, not included in
the present calculation, are expected to be important.


title: Severely infrared singular gluon propagator in QCD

abstract:
  We have explicitly shown that the infrared structure of the full gluon
propagator in QCD is an infite sum over all severe (i.e., more singular than
$1/q^2$) infrared singularities. It reflects the zero momentum modes
enhancement effect in the true QCD vacuum. Its existence exhibits a
characteristic mass (the so-called mass gap), which is responsible for the
scale of nonperturbative dynamics in the QCD ground state. By an infrared
renormalization of a mass gap only, the deep infrared structure of the full
gluon propagator is saturated by the simplest severe infrared singularity, the
famous $(q^2)^{-2}$. So, there is no smooth in the infrared limit the full
gluon propagator. The main dynamical source of severe infrared singularities in
the gluon propagator is the two-loop skeleton term of the corresponding
equation of motion, which contains the four-gluon vertices only. Taking into
account the distribution nature of severe infrared singularities, the gluon
confinement criterion is formulated in a manifestly gauge-invariant way.


title: CP asymmetries in $B\to \phi K_S$ and $B\to \eta' K_S$ in MSSM

abstract:
  We study the $B\to \phi K_S$ and $B\to \ep K_S$ decays in MSSM by calculating
hadronic matrix elements of operators with QCD factorization approach and
including neutral Higgs boson (NHB) contributions. We calculate the Wilson
coefficients of operators including the new operators which are induced by NHB
penguins at LO using the MIA with double insertions. We calculate the
$\alpha_s$ order hadronic matrix elements of the new operators for $B\to \phi
K_s$ and $B\to \eta^\prime K_s$. It is shown that the recent experimental
results on the time-dependent CP asymmetries in $B\to \phi K_S$ and $B\to \ep
K_S$, $S_{\phi K}$ is negative and $S_{\eta^{\prime} K}$ is positive, which can
not be explained in SM, can be explained in MSSM if there are flavor
non-diagonal squark mass matrix elements of 2nd and 3rd generations whose size
satisfies all relevant constraints from known experiments ($B\to X_S\gamma,
B_s\to \mu^+\mu^-, B\to X_s \mu^+\mu^-, B\to X_s g, \Delta M_s$, etc.). In
particular, we find that one can explain the experimental results with a flavor
non-diagonal mass insertion of any chirality when $\alpha_s$ corrections of
hadronic matrix elements of operators are included, in contrast with the claim
in the literature. At the same time, the branching ratios for the two decays
can also be in agreement with experimental measurements.


title: Invisible Higgs in theories of large extra dimensions

abstract:
  We discuss the possibility of detecting a Higgs boson in future collider
experiments if large extra dimensions are realized in nature. In such a case,
the Higgs boson can decay invisibly by oscillating into a graviscalar
Kaluza-Klein (KK) tower. We show that the search for such a Higgs at an $e^+
e^-$ linear collider entails more complications than are usually thought of in
relation to an invisibly decaying Higgs, the main sources of such complications
being the simultaneous presence of a continuum graviton production and the
broadening of the Higgs peak. We discuss possible ways of overcoming such
difficulties, and conclude that the detection of such a Higgs boson might still
be a problem beyond the mass range of 250-300 GeV.


title:
Single-Inclusive Jet Production in Polarized pp Collisions at
  O(alpha_s^3)

abstract:
  We present a next-to-leading order QCD calculation for single-inclusive
high-p_T jet production in longitudinally polarized pp collisions within the
``small-cone'' approximation. The fully analytical expressions obtained for the
underlying partonic hard-scattering cross sections greatly facilitate the
analysis of upcoming BNL-RHIC data on the double-spin asymmetry A_{LL}^{jet}
for this process in terms of the unknown polarization of gluons in the nucleon.
We simultaneously rederive the corresponding QCD corrections to unpolarized
scattering and confirm the results existing in the literature. We also
numerically compare to results obtained with Monte-Carlo methods and assess the
range of validity of the ``small-cone'' approximation for the kinematics
relevant at BNL-RHIC.


title: Effective gauge theories on domain walls via bulk confinement?

abstract:
  We study with lattice techniques the localisation of gauge fields on domain
wall defects in 2+1 dimensions, following a scenario originally proposed by
Dvali and Shifman for 3+1 dimensions, based on confining dynamics in the bulk.
We find that a localised gauge zero-mode does exist, if the domain wall is wide
enough compared with the confinement scale in the bulk. The range of
applicability of the corresponding low-energy effective theory is determined by
the mass gap to the higher modes. For a wide domain wall, this mass gap is set
by ``Kaluza--Klein modes'' as determined by the width. It is pointed out that
in this regime the dynamical energy scales generated by the interactions of the
localised zero-modes are in fact higher than the mass gap. Therefore, at least
in 2+1 dimensions, the zero-modes alone do not form a low-energy effective
gauge theory of a traditional type. Finally, we discuss how the situation is
expected to change in going to 3+1 dimensions.


title: Critical phenomena from the two-particle irreducible 1/N expansion

abstract:
  The 1/N expansion of the two-particle irreducible (2PI) effective action is
employed to compute universal properties at the second-order phase transition
of an O(N)-symmetric N-vector model directly in three dimensions. At
next-to-leading order the approach cures the spurious small-N divergence of the
standard (1PI) 1/N expansion for a computation of the critical anomalous
dimension eta(N), and leads to improved estimates already for moderate values
of N.

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


title: Neutrino oscillations in low density medium

abstract:
  For the case of small matter effects: $V \ll \Delta m^2/2E$, where $V$ is the
matter potential, we develop the perturbation theory using $\epsilon \equiv
2VE/\Delta m^2$ as the expansion parameter. We derive simple and physically
transparent formulas for the oscillation probabilities in the lowest order in
$\epsilon$ which are valid for arbitrary density profile. The formulas can be
applied for propagation of the solar and supernova neutrinos in matter of the
Earth, substantially simplifying numerical calculations. Using these formulas
we study sensitivity of the oscillation effects to structures of the density
profile situated at different distances from the detector $d$. We show that for
the mass-to-flavor state transitions, {\it e.g.}, $\nu_2 \to \nu_e$, the
sensitivity is suppressed for remote structures: $d > l_{\nu} E/\Delta E$,
where $l_{\nu}$ is the oscillation length and $\Delta E/E$ is the energy
resolution of detector.


title: Solar models and solar neutrino oscillations

abstract:
  We provide a summary of the current knowledge, theoretical and experimental,
of solar neutrino fluxes and of the masses and mixing angles that characterize
solar neutrino oscillations. We also summarize the principal reasons for doing
new solar neutrino experiments and what we think may be learned from the future
measurements.


title:
Search For Neutrinoless Double Beta Decay With Enriched 76Ge 1990-2003
  -- HEIDELBERG-MOSCOW-Experiment

abstract:
  The HEIDELBERG-MOSCOW experiment, which is the most sensitive double beta
decay experiment since ten years has been regularly continued until end of
November 2003. An analysis of the data has been performed already until May 20,
2003. The experiment yields now, on a 4.2 sigma level, evidence for lepton
number violation and proves that the neutrino is a Majorana particle.It further
shows that neutrino masses are degenerate. In addition it puts several
stringent constraints on other physics beyond the Standard Model. Among others
it opens the door to test various supersymmetric theory scenarios, for example
it gives the sharpest limit on the parameter lambda'_{111} in the R-parity
violating part of the superpotential, and gives information on the splitting of
the sneutrino-antisneutrino system. The result from the HEIDELBERG-MOSCOW
experiment is consistent with recent results from CMB investigations, with high
energy cosmic rays, with the result from the g-2 experiment and with recent
theoretical work. It is indirectly supported by the analysis of other Ge double
beta experiments. Recent criticism of various kind has been shown to be wrong,
among others by measurements performed in 2003 with a 214Bi source (226Ra), by
simulation of the background in the range of Q_(beta-beta) by GEANT4, and by
deeper investigation of statistical features such as sensitivity of peak
search, and relevance of width of window of analysis.


title:
A New 5 Flavour NLO Analysis and Parametrizations of Parton
  Distributions of the Real Photon

abstract:
  New, radiatively generated, NLO quark (u,d,s,c,b) and gluon densities in a
real, unpolarized photon are presented. We perform three global fits, based on
the NLO DGLAP evolution equations for Q^2>1 GeV^2, to all the available
structure function F_2^gamma(x,Q^2) data. As in our previous LO analysis we
utilize two theoretical approaches. Two models, denoted as FFNS_{CJK}1 & 2 NLO,
adopt the so-called Fixed Flavour-Number Scheme for calculation of the
heavy-quark contributions to F_2^gamma(x,Q^2), the CJK NLO model applies the
ACOT(chi) scheme. We examine the results of our fits by a comparison with the
LEP data for the Q^2 dependence of the F_2^gamma, averaged over various
x-regions, and the F_2,c^gamma. Grid parametrizations of the parton densities
for all fits are provided.


title:
Beyond the Desert 2002, Accelerator, Non--Accelerator and Space
  Approaches in the New Millenium

abstract:
  The third conference on particle physics beyond the Standard Model (BEYOND
THE DESERT'02 - Accelerator, Non-accelerator and Space Approaches) was held
during 2--7 June, 2002 at the Finish town of Oulu, almost at the northern
Arctic Circle. It was the first of the BEYOND conference series held outside
Germany (CERN Courier March 2003, pp. 29-30). Traditionally the Scientific
Programme of BEYOND conferences, brought into life in 1997 (see CERN Courier,
November 1997, pp.16-18), covers almost all topics of modern particle physics
(see contents).


title: Instanton induced quark dynamics and the pentaquark

abstract:
  We analyze the existence of the exotic $\Theta^+$ from the perspective of
instanton induced quark dynamics. The 't Hooft interaction gives strong
attraction in specific channels of the triquark $ud\bar s$ and diquark $ud$
configurations. In particular it leads to a light $ud\bar s$ triquark cluster,
with the mass around $750 {\rm MeV}$, in the I=0, $S=1/2$ and color 3
configuration, and a light $ud$-diquark configuration, with mass $440 {\rm
MeV}$, in the I=0, S=0 and color {$\bar{3}$} configuration. If we consider the
pentaquark as a bound state of such triquark and diquark configurations in a
relative L=1 state we obtain good agreement with the data. The small width of
$\Theta^+$ has a natural explanation in this model.


title: Higher Twists and Color Polarizabilities in the Neutron

abstract:
  Color polarizabilities of the neutron are extracted from data on the lowest
moment of the spin-dependent $g_1$ structure function. New data in the
resonance region from Jefferson Lab at $Q^2 \alt 1$ GeV$^2$, in combination
with world data at higher $Q^2$, allow a systematic determination of the
$1/Q^2$ corrections, and provide the first constraints on $1/Q^4$ corrections.
The results suggest that higher-twist effects in the neutron are small, and
that quark-hadron duality may be approximately valid, even down to $Q^2 \sim 1$
GeV$^2$.


title:
Leading rescattering effects cannot improve the description of $B \to K
  \pi $ data

abstract:
  Paper withdrawn by the author after learning that its main conclusion was
given earlier in a slightly different language in Appendix D of A. J. Buras, R.
Fleischer, S. Recksiegel, and F.Schwab, hep-ph/0402112.


title:
Radiative mass generation and suppression of supersymmetric
  contributions to flavor changing processes

abstract:
  We explore the possibility that the masses for the first two generations of
fermions and the quark flavor violation are generated radiatively in the
Minimal Supersymmetric Standard Model. We assume that the source of all flavor
violation resides in the the supersymmetry breaking sector and is transmitted
radiatively to the Standard Model fermion sector through finite corrections at
low energy. The approximate radiative alignment between the Yukawa and soft
supersymmetry breaking matrices helps to suppress some of the supersymmetric
contributions to flavor changing processes, overcoming current experimental
constraints. This mechanism may also explain the non-observation of proton
decay, since flavor conservation in the superpotential would imply the
suppression of dimension five operators in supersymmetric grand unified
theories.


title: Towards a NNLO calculation in hadronic heavy hadron production

abstract:
  We calculate the Laurent series expansion up to ${\cal O}(\epsilon^2)$ for
all scalar one-loop one-, two-, three- and four-point integrals that are needed
in the calculation of hadronic heavy flavour production. The Laurent series up
to ${\cal O}(\epsilon^2)$ is needed as input to that part of the NNLO
corrections to heavy hadron production at hadron colliders where the one-loop
integrals appear in the loop-by-loop contributions. The four-point integrals
are the most complicated. The ${\cal O}(\epsilon^2)$ expansion of the
four-point integrals contains polylogarithms up to $ Li_4$ and the multiple
polylogarithms.


title: Glueball production in radiative J/psi, Upsilon decays

abstract:
  Using a bound-state model of weakly bound gluons for glueballs made of two
gluons and a natural generalization of the perturbative QCD formalism for
exclusive hadronic processes, we present results for glueball production in
radiative J/psi, Upsilon decays into several possible glueball states,
including L \not= 0 ones. We perform a detailed phenomenological analysis,
presenting results for the more favored experimental candidates and for decay
angular distributions.


title: Two-loop light fermion contribution to Higgs production and decays

abstract:
  We compute the electroweak corrections due to the light fermions to the
production cross section $\sigma(g g \to H)$ and to the partial decay widths
$\Gamma (H \to \gamma \gamma)$ and $\Gamma (H \to g g)$. We present analytic
results for these corrections that are expressed in terms of Generalized
Harmonic Polylogarithms. We find that for the gluon fusion production cross
section and for the decay width $\Gamma (H \to g g)$ the corrections are large
in the Higgs mass region below 160 GeV where they reach up to 9% of the lowest
order term. For the decay width $\Gamma (H \to \gamma \gamma)$ the corrections
for Higgs mass above 160 GeV can reach $-$10% of the lowest order term.


title: The $\phi\to \omega \pi^0 $ Decay in the Chiral Model

abstract:
  The $\phi \to \omega \pi^0$ decay is studied using the method of
phenomenological chiral Lagrangians. It is shown that the weak hadronic current
between $\omega$-and $\pi^0$ -mesons is equal to zero and this decay channel
proceeds only due to the $\phi-\rho$ mixing diagram.


title: Charmless $B \to PP$ decays using flavor SU(3) symmetry

abstract:
  The decays of $B$ mesons to a pair of charmless pseudoscalar ($P$) mesons are
analyzed within a framework of flavor SU(3). Symmetry breaking is taken into
account in tree ($T$) amplitudes through ratios of decay constants; exact SU(3)
is assumed elsewhere. Acceptable fits to $B \to \pi \pi$ and $B \to K \pi$
branching ratios and CP asymmetries are obtained with tree, color-suppressed
($C$), penguin ($P$), and electroweak penguin ($P_{EW}$) amplitudes. Crucial
additional terms for describing processes involving $\eta$ and $\eta'$ include
a large flavor-singlet penguin amplitude ($S$) as proposed earlier and a
penguin amplitude $P_{tu}$ associated with intermediate $t$ and $u$ quarks. For
the $B^+ \to \pi^+ \eta'$ mode a term $S_{tu}$ associated with intermediate $t$
and $u$ quarks also may be needed. Values of the weak phase $\gamma$ are
obtained consistent with an earlier analysis of $B \to VP$ decays, where $V$
denotes a vector meson, and with other analyses of CKM parameters.


title: Color Superconductivity of QCD at High Baryon Density

abstract:
  At sufficiently high baryon density, a quark matter is expected to become a
color superconductor because of the pairing forces mediated by gluons. The
theoretical aspect of this novel phase of the strong interaction is reviewed
with the emphasis on the perturbation theory of QCD at high chemical potential
and low temperature. The derivation of the scaling formula of the
superconducting transition temperature at weak coupling is explained in detail.
The Ginzburg-Landau theory of the color superconductivity is also discussed.


title:
The Pentaquark $\Theta^+$ in $nK^+$ and $pK^0_S$, and its $\Sigma^+_5$
  partner

abstract:
  A systematic lowering in mass of strangeness ambiguous $pK^0_S$ peaks
relative to the $nK^+$ is noted. We discuss how measurement of $\gamma p\to
\Theta^+ K^0_S\to p K^0_S K^0_S \to p\pi^+\pi^-\pi^+\pi^-$ in association with
$\gamma p\to \Theta^+ K^0_S\to n K^+ K^0_S$ can help to clarify the nature of
the narrow baryon state claimed in $p K^0_S$ invariant mass distributions. This
can both establish the $\Theta^+$ in a single experiment and also reveal, or
place severe limits on, the existence of an associated $\Sigma_5$ pentaquark.


title:
Scalar $f_{0}(980)$ meson effect in radiative $\phi\to
  \pi^{+}\pi^{-}\gamma$ decay

abstract:
  We study the effect of scalar-isoscalar $f_{0}(980)$ meson in the mechanism
of the radiative $\phi\to \pi^{+}\pi^{-}\gamma$ decay. A phenomenological
approach is used to study this decay by considering the contributions of
$\sigma$-meson, $\rho$-meson and $f_{0}(980)$-meson. The interference effects
between different contributions are analyzed and the branching ratio for this
decay is calculated. We observe that $f_0$ meson contribution is much larger
than the contributions of the other terms.


title: Supersymmetry breaking as the origin of flavor

abstract:
  We present an effective flavor model for the radiative generation of fermion
masses and mixings based on a SU(5)xU(2) symmetry. We assume that the original
source of flavor breaking resides in the supersymmetry breaking sector. Flavor
violation is transmitted radiatively to the fermion Yukawa couplings at low
energy through finite supersymmetric threshold corrections. This model can fit
the fermion mass ratios and CKM matrix elements, explain the non-observation of
proton decay, and overcome present constraints on flavor changing processes
through an approximate radiative alignment between the Yukawa and the soft
trilinear sector. The model predicts new relations between dimensionless
fermion mass ratios in the three fermion sectors, and the quark mixing angles.


title:
The radiative return at phi- and B-factories: FSR for muon pair
  production at next-to-leading order

abstract:
  Muon pair production through the radiative return is of importance for a
measurement of the hadronic production cross section in two ways: it provides
an independent calibration and it may give rise to an important background for
a measurement of the pion form factor. With this motivation the Monte Carlo
event generator PHOKHARA is extended to include next-to-leading order radiative
corrections to the reaction $e^+e^-\to \mu^+\mu^-\gamma$. Furthermore, virtual
ISR corrections to FSR from pions are introduced, which extends the
applicability of the generator into a new kinematical regime. Finally, the
effect of photon vacuum polarization is introduced into this new version of the
generator.


title: Pion Velocity near the Chiral Phase Transition

abstract:
  We focus on the pion velocity at the critical temperature and study the
quantum and hadronic thermal effects based on the vector manifestation (VM). We
show the non-renormalization property on the pion velocity $v_\pi$, which is
protected by the VM, and estimate the value of $v_\pi$ to be close to the speed
of light.


title: Vector Manifestation in Hot Matter : Formulation and Predictions

abstract:
  In this write-up, I list the key ingredients for formulating the vector
manifestation in hot matter together with several predictions made so far.


title: Radiative Generation of $\theta_{13}$ with the Seesaw Threshold Effect

abstract:
  We examine whether an appreciable value of the lepton flavor mixing angle
$\theta_{13}$ at the electroweak scale $\Lambda_{\rm EW}$ can be radiatively
generated from $\theta_{13} = 0^\circ$ at the GUT scale $\Lambda_{\rm GUT}$. It
is found that the renormalization-group running and seesaw threshold effects
may lead to $\theta_{13} \sim 5^\circ$ at low energies for two simple
large-maximal mixing patterns of the MNS matrix in the minimal supersymmetric
standard model. If $\theta_{12}$ is sufficiently large at $\Lambda_{\rm GUT}$,
it will be possible to radiatively produce $\theta_{13} \sim 5^\circ$ at
$\Lambda_{\rm EW}$ both in the standard model and in its supersymmetric
extensions. The mass spectrum of three heavy right-handed Majorana neutrinos
and the cosmological baryon number asymmetry via leptogenesis are also
calculated.


title: Two-Loop Sudakov Form Factor in a Theory with Mass Gap

abstract:
  The two-loop Sudakov form factor is computed in a U(1) model with a massive
gauge boson and a $U(1)\times U(1)$ model with mass gap. We analyze the result
in the context of hard and infrared evolution equations and establish a
matching procedure which relates the theories with and without mass gap setting
the stage for the complete calculation of the dominant two-loop corrections to
electroweak processes at high energy.


title:
A simple analytic three-flavour description of the day-night effect in
  the solar neutrino flux

abstract:
  In the 3-flavour framework we derive a simple approximate analytic expression
for the day-night difference of the flux of solar $\nu_e$ at terrestrial
detectors which is valid for an arbitrary Earth density profile. Our formula
has the accuracy of a few per cent and reproduces all the known analytic
expressions for the Earth matter effects on the solar neutrino oscillations
obtained under simplifying assumptions about the Earth's density profile
(matter of constant density, 3 layers of constant densities, and adiabatic
approximation). It can also be used for studying the Earth matter effects on
the oscillations of supernova neutrinos. We also discuss the possibility of
probing the leptonic mixing angle $\theta_{13}$ through day--night asymmetry
measurements at future water Cherenkov solar neutrino detectors. We show that,
depending on the measured value of the asymmetry, the current upper bound on
$\theta_{13}$ may be improved, or even a lower bound on this mixing parameter
may be obtained.


title:
Large neutrino mixing and normal mass hierarchy: a discrete
  understanding

abstract:
  We discuss the possibility of flavor symmetries to explain the pattern of
charged lepton and neutrino masses and mixing angles. We emphasize what are the
obstacles for the generation of an almost maximal atmospheric mixing and what
are the minimal ingredients to obtain it. A model based on the discrete
symmetry $S_3$ is constructed, which leads to the dominant $\mu\tau$-block in
the neutrino mass matrix, thus predicting normal hierarchy. This symmetry makes
it possible to reproduce current data and predicts
$0.01\lesssim\theta_{13}\lesssim 0.03$ and strongly suppressed neutrinoless
$2\beta$-decay. Moreover, it implies a relation between lepton and quark mixing
angles: $\theta_{23}^q \approx 2(\pi/4-\theta_{23})$. The Cabibbo mixing can
also be reproduced and $\theta_{13}^q\sim \theta_{12}^q\theta_{23}^q$. $S_3$ is
thus a candidate to describe all the basic features of Standard Model fermion
masses and mixing.


title: Atmospheric Neutrino Oscillations and New Physics

abstract:
  We study the robustness of the determination of the neutrino masses and
mixing from the analysis of atmospheric and K2K data under the presence of
different forms of phenomenologically allowed new physics in the nu_mu--nu_tau
sector. We focus on vector and tensor-like new physics interactions which allow
us to treat, in a model independent way, effects due to the violation of the
equivalence principle, violations of the Lorentz invariance both CPT conserving
and CPT violating, non-universal couplings to a torsion field and non-standard
neutrino interactions with matter. We perform a global analysis of the full
atmospheric data from SKI together with long baseline K2K data in the presence
of nu_mu -> nu_tau transitions driven by neutrino masses and mixing together
with sub-dominant effects due to these forms of new physics. We show that
within the present degree of experimental precision, the extracted values of
masses and mixing are robust under those effects and we derive the upper bounds
on the possible strength of these new interactions in the nu_mu--nu_tau sector.


title: Inverse $\beta^+$ - decay of proton in strong magnetic field

abstract:
  In the present work, the energy spectrum and solution of Dirac's equation for
the charged and neutral fermions taking into account interaction of the
anomalous magnetic moments of particles with the external field are obtained.
The total probability of the inverse beta- decay of proton in the presence of
strong uniform magnetic field taking into account the anomalous magnetic
moments of nucleons is found.


title: QED \otimes QCD Threshold Corrections at the LHC

abstract:
  We use the theory of YFS resummation to compute the size of the expected
resummed soft radiative threshold effects in precision studies of heavy
particle production at the LHC, where accuracies of 1 percent are desired in
some processes. We find that the soft QED threshold effects are at the level of
0.3 percent whereas the soft QCD threshold effects enter at the level of 20
percent and hence both must be controlled to be on the conservative side to
achieve such goals.


title:
Search for neutrinoless double beta decay with enriched 76Ge in Gran
  Sasso 1990-2003

abstract:
  The results of the HEIDELBERG-MOSCOW experiment which searches with 11 kg of
enriched 76Ge for double beta decay in the GRAN Sasso underground laboratory
are presented for the full running period August 1990 - May 2003. The duty
cycle of the experiment was ~80%, the collected statistics is 71.7 kg y. The
background achieved in the energy region of the Q value for double beta decay
is 0.11 events/ kg y keV. The two-neutrino accompanied half-life is determined
on the basis of more than 100 000 events. The confidence level for the
neutrinoless signal has been improved to 4.2 sigma.


title: New symmetry current for massive spin-3/2 fields

abstract:
  We present several new results which will be of value to theorists working
with massive spin-3/2 vector-spinor fields as found, for example, in low and
intermediate energy hadron physics and also linearized supergravity. The
general lagrangian and propagator for a vector-spinor field in d-dimensions is
given. It is shown that the observables of the theory are invariant under a
novel continuous symmetry group which is also extended to an algebra. A new
technique is developed for exploring the consequences of the symmetry and a
previously unknown conserved vector current and charge are found. The current
leads to new interactions involving spin-3/2 particles and may have important
experimental consequences.


title: Effective Gap Equation for the Inhomogeneous LOFF Superconductive Phase

abstract:
  We present an approximate gap equation for different crystalline structures
of the LOFF phase of high density QCD at T=0. This equation is derived by using
an effective condensate term obtained by averaging the inhomogeneous condensate
over distances of the order of the crystal lattice size. The approximation is
expected to work better far off any second order phase transition. As a
function of the difference of the chemical potentials of the up and down
quarks, $\delta\mu$, we get that the octahedron is energetically favored from
$\delta\mu=\Delta_0/\sqrt 2$ to $0.95\Delta_0$, where $\Delta_0$ is the gap for
the homogeneous phase, while in the range $0.95\Delta_0-1.32\Delta_0$ the face
centered cube prevails. At $\delta\mu=1.32\Delta_0$ a first order phase
transition to the normal phase occurs.


title: Probing new physics in B -> phi pi decay

abstract:
  We analyze the rare decay mode $B \to \phi \pi $, which is a pure penguin
induced process, receiving dominant contribution from the electroweak penguins.
Thus the standard model branching ratio is expected to be very small, which
makes it as a sensitive probe of new physics. Using QCD factorization approach,
we find the branching ratio in the standard model as $Br(B^- \to \phi
\pi^-)\simeq 5 \times 10^{-9}$. Exploring some of the beyond standard model
scenarios the branching ratio is found to be $\sim {\cal O}(10^{-8})$ in the
minimal supersymmetric standard model (MSSM) with mass insertion approximation
and in the extended technicolor model (TC2). The existence of an extra
vector-like down quark (VLDQ) model predicts it to be $\sim {\cal O}(10^{-7})$.
The recent BaBar result on $B^0 \to \phi \pi^0$ might be a strong indication of
new physics effect present in the penguin induced process $B \to \phi \pi$.


title: Multiplicity distributions and H_q moments

abstract:
  It is argued that a multicomponent structure of $e^+e^-$ and $p\bar p$ high
energy collisions determines the shapes of multiplicity distributions and
oscillations of $H_q$ moments. QCD and convoluted NBD are used for comparison
with experimental data. Predictions at LHC and higher energies are shown.
Difference between $e^+e^-$ and $p\bar p$ is discussed.


title: Nuclear parton distribution functions and their uncertainties

abstract:
  We analyze experimental data of nuclear structure-function ratios
F_2^A/F_2^{A'} and Drell-Yan cross section ratios for obtaining optimum parton
distribution functions (PDFs) in nuclei. Then, uncertainties of the nuclear
PDFs are estimated by the Hessian method. Valence-quark distributions are
determined by the F_2 data at large x; however, the small-x part is not obvious
from the data. On the other hand, the antiquark distributions are determined
well at x~0.01 from the F_2 data and at x~0.1 by the Drell-Yan data; however,
the large-x behavior is not clear. Gluon distributions cannot be fixed by the
present data and they have large uncertainties in the whole x region.
Parametrization results are shown in comparison with the data. We provide a
useful code for calculating nuclear PDFs at given x and Q^2.


title: One-Loop Corrections to Radiative Muon Decay

abstract:
  One-loop QED corrections to the differential width of radiative muon decay
are considered. Results can be used to analyze high statistics data of modern
and future experiments.


title: Resonant leptogenesis in a predictive SO(10) grand unified model

abstract:
  An SO(10) grand unified model considered previously by the authors featuring
lopsided down quark and charged lepton mass matrices is successfully predictive
and requires that the lightest two right-handed Majorana neutrinons be nearly
degenerate in order to obtain the LMA solar neutrino solution. Here we use this
model to test its predictions for baryogenesis through resonant-enhanced
leptogenesis. With the conventional type I seesaw mechanism, the best
predictions for baryogenesis appear to fall a factor of three short of the
observed value. However, with a proposed type III seesaw mechanism leading to
three pairs of massive pseudo-Dirac neutrinos, resonant leptogenesis is
decoupled from the neutrino mass and mixing issues with successful baryogenesis
easily obtained.


title: TASI Lectures on Extra Dimensions and Branes

abstract:
  This is a pedagogical introduction into theories with branes and extra
dimensions. We first discuss the construction of such models from an effective
field theory point of view, and then discuss large extra dimensions and some of
their phenomenological consequences. Various possible phenomena (split
fermions, mediation of supersymmetry breaking and orbifold breaking of
symmetries) are discussed next. The second half of this review is entirely
devoted to warped extra dimensions, including the construction of the
Randall-Sundrum solution, intersecting branes, radius stabilization, KK
phenomenology and bulk gauge bosons.


title:
Vector-pseudoscalar two-meson distribution amplitudes in three-body $B$
  meson decays

abstract:
  We study three-body nonleptonic decays $B\to VVP$ by introducing two-meson
distribution amplitudes for the vector-pseudoscalar pair, such that the
analysis is simplified into the one for two-body decays. The twist-2 and
twist-3 $\phi K$ two-meson distribution amplitudes, associated with
longitudinally and transversely polarized $\phi$ mesons, are constrained by the
experimental data of the $\tau\to\phi K\nu$ and $B\to\phi K\gamma$ branching
ratios. We then predict the $B\to\phi K\gamma$ and $B\to\phi\phi K$ decay
spectra in the $\phi K$ invariant mass. Since the resonant contribution in the
$\phi K$ channel is negligible, the above decay spectra provide a clean test
for the application of two-meson distribution amplitudes to three-body $B$
meson decays.


title:
Full one-loop electroweak radiative corrections to single photon
  production in e+e-

abstract:
  Large scale calculation for the radiative corrections required for the
current and future collider experiments can be done automatically using the
GRACE-LOOP system. Here several results for e+e- --> 3-body processes are
presented including e+e- --> e+e-H and e+e- --> nu nubar gamma.


title:
Single top quark production via SUSY-QCD FCNC couplings at the CERN LHC
  in the unconstrained MSSM

abstract:
  We evaluate the $t\bar{c}$ and $t\bar{u}$ productions at the LHC within the
general unconstrained MSSM framework. We find that these single top quark
productions induced by SUSY-QCD FCNC couplings have remarkable cross sections
for favorable parameter values allowed by current low energy data, which can be
as large as a few pb. Once large rates of the $t\bar{c}$ and $t\bar{u}$
productions are detected at the LHC, they may be induced by SUSY FCNC
couplings. We show that the precise measurement of single top quark production
cross sections at the LHC is a powerful probe for the details of the SUSY FCNC
couplings.


title:
Relic density and elastic scattering cross sections of the neutralino in
  the MSSM with CP-violating phases

abstract:
  We study the neutralino relic density and the neutralino-proton elastic
scattering cross sections in the minimal supersymmetric standard model (MSSM)
with CP-violating phases. We include all the final states to the neutralino
pair annihilation cross section at the tree level, taking into account the
mixing between the CP-even and CP-odd neutral Higgs fields. We show that
variations of the relic density and the elastic scattering cross sections with
the CP-violating phases are significant. In particular, interferences between
the major contributions in the neutralino annihilation cross section can cause
considerable enhancement of the relic density.


title: Probing electroweak penguins through B^0(t) -> K_S K_S K_S

abstract: This paper has been temporarily withdrawn, due to an error in Eq. (3).


title: On dark matter search after DAMA with Ge-73

abstract:
  The Weakly Interacting Massive Particle (WIMP) is one of the main candidates
for the relic dark matter (DM).In the effective low-energy minimal
supersymmetric standard model (effMSSM) the neutralino-nucleon spin and scalar
cross sections in the low-mass regime were calculated. The calculated cross
sections are compared with almost all experimental currently available
exclusion curves for spin-dependent WIMP-proton and WIMP-neutron cross
sections. It is demonstrated that in general about two-orders-of-magnitude
improvement of the current DM experiment sensitivities is needed to reach the
(effMSSM) SUSY predictions. At the current level of accuracy it looks
reasonable to safely neglect sub-dominant spin WIMP-nucleon contributions
analyzing the data from spin-non-zero targets. To avoid misleading
discrepancies between data and SUSY calculations it is, however, preferable to
use a mixed spin-scalar coupling approach.This approach is applied to estimate
future prospects of experiments with the odd-neutron high-spin isotope Ge-73.
It is noticed that the DAMA evidence favors the light Higgs sector in the
effMSSM, a high event rate in a Ge-73 detector and relatively high upgoing muon
fluxes from relic neutralino annihilations in the Earth and the Sun.


title:
Reactor Anti-Neutrino Oscillations and Gadolinium Loaded
  Super-Kamiokande Detector

abstract:
  We explore the potential of measuring the solar neutrino oscillation
parameters in the proposed gadolinium loaded Super-Kamiokande (SK-Gd) detector.
Gadolinium dissolved in water can detect neutrons much more efficiently than
pure water. This imparts the detector the ability to observe electron type
antineutrinos, transforming Super-Kamiokande into a huge reactor antineutrino
detector with an event rate approximately 43 times higher than that observed in
KamLAND. We simulate the reactor antineutrino data expected in this high
statistics detector. We use these prospective data to study the precision with
which the solar neutrino oscillation parameters, $\Delta m^2_{\odot}$ and
$\sin^2\theta_{\odot}$, can be determined i) with the SK-Gd detector, and ii)
by combining the SK-Gd data with the global data on solar neutrino
oscillations. For comparison and completeness the allowed regions of $\Delta
m^2_{\odot}$ and $\sin^2\theta_{\odot}$, expected to be obtained from the data
of the solar neutrino and KamLAND experiments, are also presented.


title: CP violation in X_1^0 X_2^0 production at a linear collider

abstract:
  We discuss the observability of CP-violating asymmetries in the process e+ e-
-> X_1^0 X_2^0 -> X_1^0 X_1^0 l+ l-, with l = e,mu. We consider two examples of
supersymmetric scenarios: (i) with decays X_2^0 -> l_R l -> X_1^0 l+ l-; (ii)
with X_2^0 three-body decays. The asymmetries can be of order 0.1 but they are
partially washed out by the large backgrounds from W+ W- and slepton pair
production, being the observed asymmetries one order of magnitude smaller.
However, with appropriate kinematical cuts they can be observed at an e+ e-
collider with a centre of mass energy of 500 GeV and high luminosity.


title: Topology in the Little Higgs Models

abstract:
  We investigate the implications of the nontrivial vacuum structure of little
Higgs models. In particular, focusing on the littlest Higgs model, we
demonstrate the existence of three types of topological defects. One is a
global cosmic string that is truly topological. The second is more subtle; a
semilocal cosmic string, which may be stable due to dynamical effects. The
final defect is a $Z_2$ monopole solution with an unusual structure. We briefly
discuss the possible cosmological consequences of such nonperturbative
structures, although we note that these depend crucially on the fermionic
content of the models.


title:
Transverse beam polarization and CP-violating triple-gauge-boson
  couplings in e+e- -> gamma Z

abstract:
  We show that an anomalous CP-violating gamma-gamma-Z vertex gives rise to a
novel asymmetry with transversely polarized electron and positron beams in the
process e+e- -> gamma Z. This asymmetry, which is odd under naive time
reversal, is proportional to the real part of the gamma-gamma-Z CP-violating
coupling. This is in contrast to the simple forward-backward asymmetry of the
gamma (or Z) with unpolarized or longitudinally polarized beams studied
earlier, which is even under naive time reversal, and is proportional to the
imaginary part. We estimate the sensitivity of future experiments to the
determination of CP-odd gamma-gamma-Z and gamma-Z-Z couplings using these
asymmetries and transversely polarized beams.


title: CP Violation and Flavor Mixing in Technicolor Theories

abstract:
  Vacuum alignment in technicolor models provides an attractive origin for the
quarks' CP violation and, possibly, a natural solution for the strong-CP
problem of QCD. We discuss these topics in this paper. Then we apply them to
determine plausible mixing matrices for left and right-handed quarks. These
matrices determine the Cabibbo-Kobayashi-Maskawa matrix as well as new mixing
angles and phases that are observable in extended technicolor (ETC) and
topcolor (TC2) interactions. We determine the contributions of these new
interactions to CP-violating and mixing observables in the K^0, B_d and B_s
systems. Consistency with mixing and CP violation in the K^0 system requires
assuming that ETC interactions are electroweak generation conserving even if
technicolor has a walking gauge coupling. Large ETC gauge boson masses and
small intergenerational mixing then result in negligibly small ETC
contributions to B-meson mixing and CP violation and to Re(epsilon'/epsilon).
We confirm our earlier strong lower bounds on TC2 gauge boson masses from
B_d--B_d-bar mixing. We then pay special attention to the possibility that
current experiments indicate a deviation from standard model expectations of
the values of sin(2 beta) measured in B_d -> J/psi K_S, phi K_S, eta' K_S, and
pi K_S, studying the ability of TC2 to account for these. We also determine the
TC2 contribution to Delta M_{B_s} and to Re(epsilon'/epsilon), and find them to
be appreciable.


title:
Interplay between the LHC and a Linear Collider in Searches for New
  Physics

abstract:
  The LHC / LC Study Group investigates how analyses at the LHC could profit
from results obtained at a future Linear Collider and vice versa, leading to
mutual benefits for the physics program at both machines. Some examples of
results obtained within this working group so far concerning searches for new
physics are briefly summarised.


title: Transition to perturbative QCD in two-photon collisions

abstract:
  We propose that the different angular distributions in two-photon collisions
observed at low and high center-of-mass energies $W_{\gamma\gamma}$ indicate
the transition from nonperturbative to perturbative QCD. We calculate the
differential cross sections of $\gamma \gamma\to\pi \pi$, $KK$ in the angle
$\theta$ of one of the final-state mesons using QCD sum rules and the
perturbative QCD approach based on $k_T$ factorization theorem. Our predictions
from sum rules (perturbative QCD) decrease (increase) with $|\cos\theta|$,
consistent with the Belle data of $\gamma \gamma\to K^+K^-$ for
$W_{\gamma\gamma}\approx 1.5$-1.7 (2.2-2.4) GeV.


title: Interactions of Reggeized Gluons in the M\"obius Representation

abstract:
  We investigate consequences of the M\"obius invariance of the BFKL
Hamiltonian and of the triple Pomeron vertex. In particular, we show that the
triple Pomeron vertex in QCD, when restricted to the large $N_c$ limit and to
the space of M\"obius functions, simplifies and reduces to the vertex used in
the Balitsky-Kovchegov (BK) equation. As a result, the BK equation for the
dipole density appears as a special case of the nonlinear evolution equation
which sums the fan diagrams for BFKL Green's functions in the M\"obius
representation. We also calculate the corrections $O(1/(N_c^2-1)$ to the triple
Pomeron vertex in the space of M\"obius functions, and we present a
generalization of the BK-equation in the next-to-leading order approximation in
the $1/N_c$ expansion.


title: The Three-Loop Splitting Functions in QCD: The Singlet Case

abstract:
  We compute the next-to-next-to-leading order (NNLO) contributions to the
splitting functions governing the evolution of the unpolarized flavour-singlet
parton densities in perturbative QCD. The exact expressions are presented in
both Mellin-N and Bjorken-x space. We also provide accurate parametrizations
for practical applications. Our results agree with all partial results
available in the literature. As in the non-singlet case, the correct leading
logarithmic predictions for small momentum fractions x do not provide good
estimates of the respective complete splitting functions. We investigate the
size of the corrections and the stability of the NNLO evolution under variation
of the renormalization scale. The perturbative expansion appears to converge
rapidly at x >~ 10^-3. Relatively large third-order corrections are found at
smaller values of x.


title:
Relativistic diffusion process and analysis of transverse momentum
  distributions observed at RHIC

abstract:
  Large transverse momentum distributions of identified particles observed at
RHIC are analyzed by a relativistic stochastic model in the three dimensional
rapidity space. Temperature for inclusive reactions is estimated.