title:
Fermionic decays of scalar leptoquarks and scalar gluons in the minimal
  four color symmetry model

abstract:
  Fermionic decays of the scalar leptoquarks $ S=S_1^{(+)}, S_1^{(-)}, S_m $
and of the scalar gluons $F=F_1, F_2$ predicted by the four color symmetry
model with the Higgs mechanism of the quark-lepton mass splitting are
investigated. Widths and branching ratios of these decays are calculated and
analysed in dependence on coupling constants and on masses of the decaying
particles. It is shown that the decays $ S_1^{(+)}\to tl^+_j, S_1^{(-)}\to
\nu_i\tilde b, S_m\to t\tilde \nu_j, F_1\to t\tilde b, F_2\to t\tilde t $ are
dominant with the widths of order of a few GeV for $m_S, m_F<1$ TeV and with
the total branching ratios close to 1. In the case of $m_S < m_t$ the dominant
scalar leptoquark decays are $ S_1^{(+)}\to cl_j^+, S_1^{(-)}\to \nu_i\tilde b,
S_m\to b\l_j^+, S_m\to c\tilde \nu_j $ with the total branching ratios
$Br(S_1^{(+)}\to cl^+) \approx $ $Br(S_1^{(-)}\to \nu\tilde b) \approx 1$,
$Br(S_m\to bl^+) \approx 0.9$ and $Br(S_m\to c\tilde \nu) \approx 0.1.$ A
search for such decays at the LHC and Tevatron may be of interest.


title: The $J^P=1^+$ $ud\bar s\bar s$ Tetraquark

abstract:
  Using the color-magnetic interaction Hamiltonian with SU(3) flavor symmetry
breaking, we perform a schematic study of the masses of the $J^P=1^+$
tetraquarks in the anti-decuplet representation. After diagonalizing the mass
matrix, we find the $ud\bar s\bar s$ tetraquark lies around 1347 MeV. It decays
into $K^+K^0\pi^0, K^+K^+\pi^-, K^0K^0\pi^+$ via P-wave. The dual suppression
from the not-so-big three-body phase space and P-wave decay barrier may render
this exotic state rather narrow. Future experimental exclusion of this state
will cast doubt on the validity of applying the simple color-magnetic
Hamiltonian to the multiquark system.


title: Hexagonal SU(3) Unification and its Manifestation at the TeV Scale

abstract:
  We consider $SU(3)_{C}\times SU(2)_{AL}\times SU(2)_{BL}\times U(1)_{Y}$ as
the low-energy subgroup of supersymmetric $SU(3)^{6}$ unification. This may
imply small deviations from quark-lepton universality at the TeV scale, as
allowed by neutron-decay data. New particles are predicted with specific
properties. We discuss in particular the new heavy gauge bosons corresponding
to $SU(2)_{AL} \times SU(2)_{BL} \to SU(2)_L$.


title: 1/m_Q Corrections to B -> rho l nu Decay and |V_{ub}|

abstract:
  In the heavy quark effective field theory of QCD, we analyze the order 1/m_Q
contributions to heavy to light vector decays. Light cone sum rule method is
applied with including the effects of 1/m_Q order corrections. We then extract
|V_{ub}| from B -> rho l nu decay up to order of 1/m_Q corrections.


title: X(1835): A Natural Candidate of $\eta^\prime$'s Second Radial Excitation

abstract:
  Recently BES collaboration observed one interesting resonance X(1835). We
point out that its mass, total width, production rate and decay pattern favor
its assignment as the second radial excitation of $\eta^\prime$ meson very
naturally.


title:
The supersymmetric interpretation of the EGRET excess of diffuse
  Galactic gamma rays

abstract:
  Recently it was shown that the excess of diffuse Galactic gamma rays above 1
GeV traces the Dark Matter halo, as proven by reconstructing the peculiar shape
of the rotation curve of our Galaxy from the gamma ray excess. This can be
interpreted as a Dark Matter annihilation signal. In this paper we investigate
if this interpretation is consistent with Supersymmetry. It is found that the
EGRET excess combined with all electroweak constraints is fully consistent with
the minimal mSUGRA model for scalars in the TeV range and gauginos below 500
GeV.


title: Effect of neutrino trapping on the three flavor FFLO phase of QCD

abstract:
  We compute the effect of a non-zero lepton chemical potential on the
structure of the three flavor Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase of
QCD at finite temperature. We show that, as in the BCS case, the lepton
chemical potential favors two-species color superconductivity and disfavors the
three species pairing. We stress that this study could be relevant for the
cooling of a proto-neutron star with a FFLO core, if the temperatures are
higher than the un-trapping temperature.


title: The existence of a mass gap in quantum Yang-Mills theory

abstract:
  The skeleton loop integrals which contribute into the gluon self-energy have
been iterated (skeleton loops expansion) within the Schwinger-Dyson equation
for the full gluon propagator. No any truncations/approximations as well as no
special gauge choice have been made. It is explicitly shown that such obtained
general iteration solution for the full gluon propagator can be exactly and
uniquely decomposed as a sum of the two pricipally different terms. The first
term is the Laurent expansion in integer powers of severe (i.e., more singular
than $1/q^2$) infrared singularities accompanied by the corresponding powers of
the mass gap and multiplied by the corresponding residues. The second
(perturbative) term is always as much singular as $1/q^2$ and otherwise
remaining undetermined. We have explicitly demonstrated that the mass gap is
hidden in the above-mentioned skeleton loop integrals due to the nonlinear
interaction of massless gluon modes. It shows explicitly up when the gluon
momentum goes to zero. The appropriate regularization scheme has been applied
in order to make a gauge-invariant existence of the mass gap perfectly clear.
Moreover, it survives an infinite series summation of the relevant skeleton
loop contributions into the gluon self-energy. The physical meaning of the mass
gap is to be responsible for the large scale structure of the true QCD vacuum.


title:
Possible Deviation from the Tri-bimaximal Neutrino Mixing in a Seesaw
  Model

abstract:
  We propose a simple but suggestive seesaw model with two phenomenological
conjectures: three heavy (right-handed) Majorana neutrinos are degenerate in
mass in the symmetry limit and three light Majorana neutrinos have the
tri-bimaximal mixing pattern $V^{}_0$. We show that a small mass splitting
between the first generation and the other two generations of heavy Majorana
neutrinos is responsible for the deviation of the solar neutrino mixing angle
$\theta^{}_{12}$ from its initial value $35.3^\circ$ given by $V^{}_0$, and the
slight breaking of the mass degeneracy between the second and third generations
of heavy Majorana neutrinos results in a small mixing angle $\theta^{}_{13}$
and a tiny departure of the atmospheric neutrino mixing angle $\theta^{}_{23}$
from $45^\circ$. It turns out that a normal hierarchy of the light neutrino
mass spectrum is favored in this seesaw scenario.


title: On the nonperturbative charm effects in inclusive B -> X_c l\nu decays

abstract:
  We address the nonperturbative effects associated with soft charm quarks in
inclusive B decays. Such corrections are allowed by the OPE, but have largely
escaped attention so far. The related four-quark `double heavy' expectation
values of the form <B|\bar{b}c \bar{c}b|B> are computed in the 1/m_c expansion
by integrating out the charm field to one and two loops. A significant
enhancement of the two-loop coefficients has been noted. A method is suggested
for evaluating the expectation values of the higher-order b-quark operators
required to calculate charm expectation values, free from the overly large
ambiguities of dimensional analyses. The soft-charm effects were found
generally at the level of 0.5% in \Gamma_{sl}(b->c); however, as a result of
cancellations the net impact should be smaller. We propose a direct way to
search for such effects in the data. Finally, we discuss the relation of the
soft charm corrections in inclusive decays with the `Intrinsic Charm' ansatz.


title: Simulations of black hole air showers in cosmic ray detectors

abstract:
  We present a comprehensive study of TeV black hole events in Earth's
atmosphere originated by cosmic rays of very high energy. An advanced fortran
Monte Carlo code is developed and used to simulate black hole extensive air
showers from ultrahigh-energy neutrino-nucleon interactions. We investigate the
characteristics of these events, compare the black hole air showers to standard
model air showers, and test different theoretical and phenomenological models
of black hole formation and evolution. The main features of black hole air
showers are found to be independent of the model considered. No significant
differences between models are likely to be observed at fluorescence telescopes
and/or ground arrays. We also discuss the tau ``double bang'' signature in
black hole air showers. We find that the energy deposited in the second bang is
too small to produce a detectable peak. Our results show that the theory of
TeV-scale black holes in ultrahigh-energy cosmic rays leads to robust
predictions, but the fine prints of new physics are hardly to be investigated
through atmospheric black hole events in the near future.


title:
High-precision determination of the light-quark masses from realistic
  lattice QCD

abstract:
  Three-flavor lattice QCD simulations and two-loop perturbation theory are
used to make the most precise determination to date of the strange-, up-, and
down-quark masses, $m_s$, $m_u$, and $m_d$, respectively. Perturbative matching
is required in order to connect the lattice-regularized bare- quark masses to
the masses as defined in the \msbar scheme, and this is done here for the first
time at next-to-next-to leading (or two-loop) order. The bare-quark masses
required as input come from simulations by the MILC collaboration of a
highly-efficient formalism (using so-called ``staggered'' quarks), with three
flavors of light quarks in the Dirac sea; these simulations were previously
analyzed in a joint study by the HPQCD and MILC collaborations, using
degenerate $u$ and $d$ quarks, with masses as low as $m_s/8$, and two values of
the lattice spacing, with chiral extrapolation/interpolation to the physical
masses. With the new perturbation theory presented here, the resulting \msbar\
masses are $m^\msbar_s(2 {GeV}) = 87(0)(4)(4)(0)$ MeV, and $\hat m^\msbar(2
{GeV}) = 3.2(0)(2)(2)(0)$ MeV, where $\hat m = \sfrac12 (m_u + m_d)$ is the
average of the $u$ and $d$ masses. The respective uncertainties are from
statistics, simulation systematics, perturbation theory, and
electromagnetic/isospin effects. The perturbative errors are about a factor of
two smaller than in an earlier study using only one-loop perturbation theory.
Using a recent determination of the ratio $m_u/m_d = 0.43(0)(1)(0)(8)$ due to
the MILC collaboration, these results also imply $m^\msbar_u(2 {GeV}) =
1.9(0)(1)(1)(2)$ MeV and $m^\msbar_d(2 {GeV}) = 4.4(0)(2)(2)(2)$ MeV. A
technique for estimating the next order in the perturbative expansion is also
presented, which uses input from simulations at more than one lattice spacing.


title:
Branching Ratio and CP Asymmetry of $B \to \pi \eta^{(\prime)}$ Decays
  in the Perturbative QCD Approach

abstract:
  We calculate the branching ratios and CP-violating asymmetries for $B^0 \to
\pi^0 \eta^{(\prime)}$ and $B^+\to \pi^+ \eta^{(\prime)}$ decays in the
perturbative QCD (pQCD) factorization approach here. We not only calculate the
usual factorizable contributions, but also evaluate the non-factorizable and
annihilation type contributions. Besides the current-current operators, the
contributions from the QCD and electroweak penguin operators are also taken
into account. The pQCD results for the CP-averaged branching ratios are $Br(B^+
\to \pi^+ \eta) \approx 4.1 \times 10^{-6}$, $Br(B^+ \to \pi^+ \eta^\prime)
\approx 2.4 \times 10^{-6}$, and $Br(B^0 \to \pi^0 \eta^{(\prime)}) \approx 0.2
\times 10^{-6}$, which agree very well with the measured values or currently
available experimental upper limits. We also predict large CP-violating
asymmetries in these decays: $A_{CP}^{dir}(\pi^\pm \etap)\sim
A_{CP}^{dir}(\pi^0 \etap)\sim -0.35 $, and $A_{CP}^{mix}(\pi^0 \etap)\sim
0.67$, but with large errors. The pQCD prediction for $A_{CP}^{dir}(\pi^\pm
\eta)$ ($A_{CP}^{dir}(\pi^\pm \eta^\prime))$ has the same (opposite) sign with
the primary measured values. Further improvements in both theory and
experiments are needed to clarify this discrepancy.


title: Moduli stabilization and the pattern of soft SUSY breaking terms

abstract:
  In string compactification preserving N=1 SUSY, moduli fields are plausible
candidates for the messenger of SUSY breaking at low energy scales. In a
scenario that moduli-mediated SUSY breaking is significant, the pattern of soft
SUSY breaking terms depends crucially on how the light moduli with mass m
\lesssim O(8\pi^2 m_{3/2}) are stabilized. We discuss the correspondence
between the pattern of soft terms and the stabilization mechanism of light
moduli within the framework of 4D effective supergravity which is generalized
to include a SUSY-breaking uplifting potential which might be necessary to get
the phenomenologically viable de-Sitter (or Minkowski) vacuum. In some special
case, light moduli can be stabilized by controllably small perturbative
corrections to the K\"ahler potential, yielding the soft terms dominated by the
moduli-mediated contribution. In more generic situation, light moduli are
stabilized by non-perturbative effects encoded in the superpotential and a
quite different pattern of soft terms emerges: the anomaly-mediated soft terms
become comparable to the moduli-mediated ones. Such mixed moduli-anomaly
mediated soft terms lead to low energy superparticle masses qualitatively
different from those of other mediation models such as mSUGRA scenario,
gauge-mediation, and anomaly-mediation.


title:
Limiting energy dependence of spin parameters in small-angle elastic
  pp-scattering

abstract:
  We consider limiting behavior with energy of spin parameters at small values
of t close to zero which corresponds to the saturation of the Froissart-Martin
bound for the total cross sections.


title: Phi meson electroproduction at small Bjorken-x

abstract:
  It is reported on an analysis of Phi-meson electroproduction at small
Bjorken-x within the handbag approach. The amplitudes factorize into
generalized parton distributions and a partonic subprocess, electroproduction
off gluons. Cross sections and spin density matrix elements are evaluated for
Phi-meson electroproduction and found to be in fair agreement with recent HERA
data.


title: GUT angle minimises $Z^0$ decay

abstract:
  The GUT value of Weinberg's angle is also the value that minimises the total
square matrix elements of $Z^0$ decay, independently of any GUT consideration,
and thus the one that maximises the neutrino branching ratio against total
width. We review the proof of this result and some related facts.


title: Equation of state from lattice QCD

abstract:
  Recent results on the equation of state from lattice QCD are reviewed. The
lattice technique and previous results are shortly discussed. New results for
physical quark masses and two sets of lattice spacings are presented. The
pressure, energy density, entropy density, speed of sound and quark number
susceptibilities are determined.


title: Radiative decays and the nature of heavy quarkonia

abstract:
  We argue that the photon spectra in radiative decays of various heavy
quarkonium states provide important information on their nature. If two of
these states are in the strong coupling regime, we are able to produce a
parameter-free model independent formula, which holds at next-to-leading order
and includes both direct and fragmentation contributions. When the formula is
checked against recent CLEO data it favors Upsilon (2S) and Upsilon (3S) in the
strong coupling regime and disfavors Upsilon (1S) in it.


title: Factorizable corrections to e+e- -> mu+ mu- b bar_b at a linear collider

abstract:
  We discuss the standard model factorizable radiative corrections to e+e- ->
mu+ mu- b bar_b, which is one of the best detection channels of the low mass
Higgs boson produced through the Higgsstrahlung mechanism at a linear collider.
The discussion includes the leading virtual and real quantum electrodynamics
corrections due to the initial state radiation, the one-loop electroweak
factorizable corrections to the on-shell Higgsstrahlung reaction and to
subsequent decays of the Z and Higgs boson, and the quantum chromodynamics
corrections to the Higgs boson decay width into a b bar_b-quark pair.


title: Nonleptonic Weak Decays of B to D_s and D mesons

abstract:
  Branching ratios and polarization amplitudes for B decaying to all allowed
pseudoscalar, vector, axial-vector, scalar and tensor combinations of D_s and D
mesons are calculated in the Isgur Scora Grinstein Wise (ISGW) quark model
after assuming factorization. We find good agreement with other models in the
literature and the limited experimental data and make predictions for as yet
unseen decay modes. Lattice QCD results in this area are very limited. We make
phenomenological observations on decays in to D_s(2317) and D_s(2460) and
propose tests for determining the status and mixings of the axial mesons. We
use the same approach to calculate branching ratios and polarization fraction
for decays in to two D type mesons.


title:
Cross sections, error bars and event distributions in simulated
  Drell-Yan azimuthal asymmetry measurements

abstract:
  A short summary of results of recent simulations of (un)polarized Drell-Yan
experiments is presented here. Dilepton production in $pp$, $\bar{p}p$,
$\pi^-p$ and $\pi^+p$ scattering is considered, for several kinematics
corresponding to interesting regions for experiments at GSI, CERN-Compass and
RHIC. A table of integrated cross sections, and a set of estimated error bars
on measurements of azimuthal asymmetries (associated with collection of 5, 20
or 80 Kevents) are reported.


title:
Decays of tensor mesons and the tensor glueball in an effective field
  approach

abstract:
  The strong and electromagnetic decays of the ground-state tensor mesons are
studied in an effective field approach. A fit to the well-known experimental
data is performed. The decay ratios of the tensor glueball are evaluated and
possible candidates are discussed.


title: Couplings of Vector-Spinor Representation for SO(10) Model Building

abstract:
  Higgs multiplet in the vector-spinor representations of SO(10), i.e., the
$144+\bar{144}$ multiplet can break the SO(10) gauge symmetry spontaneously in
one step down to the Standard Model gauge group symmetry $SU(3)_C\times
SU(2)_L\times U(1)_Y$ and a recent analysis has used such vector-spinors for
building a new class of SO(10) grand unification models (hep-ph/0506312) . Here
we discuss the techniques for the computation of several classes of
vector-spinor couplings using the Basic Theorem on the SO(2N) vertex expansion
developed by the authors. The computations include the cubic couplings of the
vector-spinors with SO(10) tensors, quartic self-couplings of the
vector-spinors, and couplings of the vector-spinors with spinor representations
of SO(10). The last set include couplings of vector-spinors with the 16-plets
of quarks and lepton and with the 16 and $\bar{16}$ of Higgs. These couplings
provide a crucial tool for further development of the SO(10) grand unification
using vector-spinor representations. These include study of quark-lepton
masses, analysis of dimension five operators including baryon and lepton number
violating operators, and study of neutrino masses and mixings. Illustrative
examples are given for their computation using a sample of vector-spinor
couplings.


title: Physics of Nuclear Antishadowing

abstract:
  Shadowing and antishadowing of the electromagnetic nuclear structure
functions are produced by the coherence of multiscattering quark nuclear
processes. This picture leads to substantially different antishadowing for
charged and neutral current processes, particularly in anti-neutrino reactions,
thus affecting the extraction of the weak-mixing angle $\sin^2\theta_W$.


title:
Comment on the Walliser-Weigel approach to exotic baryons in chiral
  soliton models

abstract:
  This comment discusses a recent paper by Walliser and Weigel on the
quantization of chiral soliton models in the context of exotic baryons. Claims
made in that work are misleading due to unfortunate nomenclature. Moreover,
attempts in that paper to go beyond the leading order calculations of the phase
shifts are ad hoc and never justified. This comment also addresses a technical
issue in that paper: the identification of the excitation energy of the
pentaquark obtained via conventional rigid rotor quantization with a frequency
obtained in the context of small amplitude fluctuations. The identification is
erroneous: the small amplitude fluctuation result is based on a first-order
perturbation computation of the frequency around a zero mode solution at a
frequency far from zero and well away from the perturbative regime.


title: Quark and Gluon Sivers Functions

abstract:
  The physics of hadron single transverse spin asymmetries is discussed.
Possible measurements of both the quark and gluon Sivers functions are
proposed.


title: Numerical evaluation of loop integrals

abstract:
  We present a new method for the numerical evaluation of arbitrary loop
integrals in dimensional regularization. We first derive Mellin-Barnes integral
representations and apply an algorithmic technique, based on the Cauchy
theorem, to extract the divergent parts in the epsilon->0 limit. We then
perform an epsilon-expansion and evaluate the integral coefficients of the
expansion numerically. The method yields stable results in physical kinematic
regions avoiding intricate analytic continuations. It can also be applied to
evaluate both scalar and tensor integrals without employing reduction methods.
We demonstrate our method with specific examples of infrared divergent
integrals with many kinematic scales, such as two-loop and three-loop box
integrals and tensor integrals of rank six for the one-loop hexagon topology.


title: Testing mass-varying neutrinos with reactor experiments

abstract:
  We propose that reactor experiments could be used to constrain the
environment dependence of neutrino mass and mixing parameters, which could be
induced due to an acceleron coupling to matter fields. There are several
short-baseline reactor experiment projects with different fractions of air and
earth matter along the neutrino path. Moreover, the short baselines, in
principle, allow the physical change of the material between source and
detector. Hence, such experiments offer the possibility for a direct comparison
of oscillations in air and matter. We demonstrate that for $\sin^2 2
\theta_{13} \gtrsim 0.04$, two reactor experiments (one air, one matter) with
baselines of at least 1.5 km can constrain any oscillation effect which is
different in air and matter at the level of a few per cent. Furthermore, we
find that using the same experiment while physically moving the material
between source and detector improves systematics.


title:
XIth International Conference on Elastic and Diffractive Scattering in
  Chateau de Blois, France, May 15 - 20, 2005. Conference Summary

abstract:
  Summary of the XIth International Conference on Elastic and Diffractive
Scattering in Chateau de Blois, France, May 15 - 20, 2005, summarizing both
theoretical and experimental presentations and discussions.


title: New states above charm threshold

abstract:
  We revise and extend expectations for the properties of charmonium states
that lie above charm threshold, in light of new experimental information. We
refine the Cornell coupled-channel model for the coupling of c-cbar levels to
two-meson states, defining resonance masses and widths by pole positions in the
complex energy plane, and suggest new targets for experiment.


title:
The Quark-Gluon Plasma: a Perfect Thermostat and a Perfect Particle
  Reservoir

abstract:
  A system H with a Hagedorn-like mass spectrum imparts its unique temperature
T_H to any other system coupled to it. An H system radiates particles in
preexisting physical and chemical equilibrium. These particles form a saturated
vapor at temperature T_H. This coexistence describes a first order phase
transition. An H system is nearly indifferent to fragmentation into smaller H
systems. A lower mass cut-off in the spectrum does not significantly alter the
general picture. These properties of the Hagedorn thermostats naturally explain
a single value of hadronization temperature observed in elementary particle
collisions at high energies and lead to some experimental predictions.


title: The Fritzsch Ansatz Revisited

abstract:
  A modified Fritzsch ansatz for the quark mass matrices is proposed to account
for the hierarchical structure of the CKM matrix. To allow for the observed CP
asymmetry, restrictions have to be imposed on the relative phase degree of
freedom among the weak eigenstates of the quark fields, as for example by
certain additional symmetries. The ansatz can be accommodated in extensions to
the Standard Model, such as the multiple Higgs doublets models.


title:
Spontaneous generation of the Nambu --Jona-Lazinio interaction in
  quantum chromodynamics with two light quarks

abstract:
  In QCD with two light quarks with application of Bogolubov quasi-averages
approach a possibility of spontaneous generation of an effective interaction,
leading to the Nambu -- Jona-Lazinio model, is studied. Compensation equations
for form-factor of the interaction is shown to have the non-trivial solution
leading to theory with two parameters: average low-energy value of $\alpha_s$
and dimensional parameter $f_\pi$. All other parameters: the current and the
constituent quark masses, the quark condensate, mass of $\pi$ meson, mass of
$\sigma$ meson and its width are expressed in terms of the two initial
parameters in satisfactory correspondence to experimental phenomenology. The
results being obtained allow to state an applicability of the approach in the
low-energy hadron physics and promising possibilities of its applications to
other problems.


title:
Coherent photon-hadron interactions in pA collisions: Small-x physics
  after HERA

abstract:
  In this letter we study the photoproduction of heavy quarks and vector mesons
in the coherent proton-nucleus (pA) interactions for RHIC and LHC energies and
analyze if these processes can be used to determine the QCD dynamics at high
energies. The integrated cross section and rapidity distribution are estimated
using the Color Glass Condensate (CGC) formalism. A comparison with the linear
dynamics predictions is also presented. Our results indicate that the nonlinear
dynamics can be proven in those reactions, which are well suited for studing
saturation effects.


title: Axion interpretation of the PVLAS data?

abstract:
  The PVLAS collaboration has recently reported the observation of a rotation
of the polarization plane of light propagating through a transverse static
magnetic field. Such an effect can arise from the production of a light, m_A ~
meV, pseudoscalar coupled to two photons with coupling strength g_{A\gamma} ~
5x10^{-6} GeV^{-1}. Here, we review these experimental findings, discuss how
astrophysical and helioscope bounds on this coupling can be evaded, and
emphasize some experimental proposals to test the scenario.


title: Hard Diffraction -- from Blois 1985 to 2005

abstract:
  The idea of diffractive processes with a hard scale involved, to resolve the
underlying parton dynamics, was presented at the first Blois conference in 1985
and experimentally verified a few years later. Today hard diffraction is an
active research field with high-quality data and new theoretical models. The
trend from Regge-based pomeron models to QCD-based parton level models has
given insights on QCD dynamics involving perturbative gluon exchange
mechanisms, including the predicted BFKL-dynamics, as well as novel ideas on
non-perturbative colour fields and their interactions.


title: Productions of X(1835) as baryonium with sizable gluon content

abstract:
  The X(1835) has been treated as a baryonium with sizable gluon content, and
to be almost flavor singlet. This picture allows us to rationally understand
X(1835) production in $J/\psi$ radiative decays, and its large couplings with
$p\bar{p}$, $\eta^{\prime}\pi\pi$. The processes $\Upsilon(1S)\to \gamma
X(1835)$ and $J/\psi\to \omega X(1835)$ have been examined. It has been found
that $Br(\Upsilon(1S)\to\gamma X(1835))Br(X(1835)\to
p\bar{p})<6.45\times10^{-7}$, which is compatible with CLEO's recently
experimental result (Phys.Rev.$\mathbf{D73}$ (2006) 032001;hep-ex/0510015). The
branching fractions of $Br(J/\psi\to\omega X(1835))$, $Br(J/\psi\to\rho
X(1835))$ with $X(1835)\to p\bar{p}$ and
$X(1835)\to\eta^{\prime}\pi^{+}\pi^{-}$ have been estimated by the quark-pair
creation model. We show that they are heavily suppressed, so the signal of
X(1835) is very difficult, if not impossible, to be observed in these
processes. The experimental checks for these estimations are expected. The
existence of the baryonium nonet is conjectured, and a model independent
derivation of their production branching fractions is presented.


title: On the massive two-loop corrections to Bhabha scattering

abstract:
  We overview the general status of higher order corrections to Bhabha
scattering and review recent progress in the determination of the two-loop
virtual corrections. Quite recently, they were derived from combining a
massless calculation and contributions with electron sub-loops. For a massive
calculation, the self-energy and vertex master integrals are known, while most
of the two-loop boxes are not. We demonstrate with an example that a study of
systems of differential equations, combined with Mellin-Barnes representations
for single masters, might open a way for their systematic calculation.


title: Collider Tests of the Non-Commutative Standard Model

abstract:
  We discuss the non-commutative extension of the standard model constructed
with the Seiberg-Witten maps for SU(3)_C x SU(2)_L x U(1)_Y. Using the
first-order approximation in the non-commutative parameters theta, we estimate
the sensitivity of Z-gamma-production at the Tevatron and LHC from Monte Carlo
simulation.


title:
Order alpha_s^2 QCD corrections to inclusive jet production in deep
  inelastic scattering

abstract:
  We analyze the order alpha_s^2 corrections to the single inclusive jet cross
section in lepton-nucleon deep inelastic scattering. The full calculation is
done analytically, in the small cone approximation, obtaining finite NLO
partonic level cross sections for these processes. A detailed study of the
different underlying partonic reactions is presented focusing in the size of
the corrections they get at NLO accuracy, their relative weight, and the
residual scale uncertainty they leave in the full cross section depending on
the kinematical region explored. The dominant partonic process in very forward
jet production is found to start at order alpha_s^2, being effectively a lowest
order estimate, with the consequent large factorization scale uncertainty, and
the likelihood of non-negligible corrections at the subsequent order in
perturbation theory.


title: The Nuclear Modification Factor at Large Rapidities

abstract:
  RHIC data on high-$p_T$ hadron production display strong suppression in a
wide rapidity region, indicating strong induced energy loss for both
transversally and longitudinally traveling partons. We investigate the
interplay of energy loss and rapidity dependence in a perturbative QCD improved
parton model, and estimate the opacity of the produced hot matter in $AuAu$
collisions at energies $\sqrt{s}=200$ $A$GeV and 63 $A$GeV at different
rapidity values. Direction-dependent suppression offers the possibility to
study the geometry of the hot matter.


title: Recoilless Resonant Capture of Antineutrinos

abstract:
  Resonant capture of antineutrinos can be accomplished by exploiting the
monoenergetic antineutrinos emitted in bound state beta-decay. Extending this
idea, I explore conditions for recoilless resonant capture in the system 3H -
3He. Observation of such transitions can set the stage for placing stringent
limits on the neutrino parameter theta-13 on an ultra-short baseline of ~9 m
and for observing the gravitational red shift of neutrinos


title:
Impact of the higher twist effects on the $\gamma\gamma^{*} \to \pi^{0}$
  transition form factor

abstract:
  We reanalyze the $\gamma\gamma^{*} \to \pi^{0}$ transition form factor
$F_{\pi\gamma}(Q^2)$ within the QCD light-cone sum rules method with the
twist-4 accuracy. In computations the pion leading twist distribution amplitude
(DA) with two nonasymptotic terms, and the renormalon method-inspired twist-4
DAs are used. The latters allow us to estimate impact of effects due to higher
conformal spin components in the pion twist-4 DAs on the form factor
$F_{\pi\gamma}(Q^2)$. Obtained theoretical predictions are employed to deduce
constraints on the pion DAs from CELLO and CLEO data.


title: Structure of the $\sigma$-meson and diamagnetism of the nucleon

abstract:
  The structure of the $\sigma$ meson and the diamagnetism of the nucleon are
shown to be topics which are closely related to each other. Arguments are found
that the $\sigma$ meson couples to two photons via its non-strange $q\bar{q}$
structure component. This ansatz leads to a quantitative explanation of the
$t$-channel component of the difference of electromagnetic polarizabilities,
(\alpha-\beta)^t$, containing the diamagnetism of the nucleon. The prediction
is $(\alpha-\beta)^t_{p,n}=(5\alpha_e g_{\pi MM})/(6\pi^2 m^2_\sigma
f_\pi)=15.3$ in units of $10^{-4}{\rm fm}^3$ to be compared with the
experimental value $(\alpha-\beta)^t_p=15.1\pm 1.3$ for the proton and
$(\alpha-\beta)^t_n=14.8\pm 2.7$ for the neutron. The equivalent approach to
exploit the $\pi\pi$ structure component of the $\sigma$ meson via the BEFT sum
rule leads to $(\alpha-\beta)^t_{p,n}=14\pm 2$, what also is in agreement with
the experimental results.


title: Electromagnetic Form Factors of the Nucleon in Chiral Soliton Models

abstract:
  The ratio of electric to magnetic proton form factors G_E/G_M as measured in
polarization transfer experiments shows a characteristic linear decrease with
increasing momentum transfer Q^2. We present a simple argument how such a
decrease arises naturally in chiral soliton models. For a detailed comparison
of model results with experimentally determined form factors it is necessary to
employ a boost from the soliton rest frame to the Breit frame. To enforce
asymptotic counting rules for form factors, the model must be supplemented by
suitably chosen interpolating powers n in the boost prescription. Within the
minimal pi-rho-omega soliton model, with the same n for both, electric and
magnetic form factors, it is possible to obtain a very satisfactory fit to all
available proton data for the magnetic form factor and to the recent
polarization results for the ratio G_E/G_M. At the same time the small and very
sensitive neutron electric form factor is reasonably well reproduced. The
results show a systematic discrepancy with presently available data for the
neutron magnetic form factor G_M^n for Q^2 > 1 (GeV/c)^2. We additionally
comment on the possibility to extract information about the form factors in the
time-like region and on two-photon exchange contributions to unpolarized
elastic scattering which specifically arise in soliton models.


title: S-wave and P-wave non-strange baryons in the potential model of QCD

abstract:
  In this paper, we study the nucleon energy spectrum in the ground-state (with
orbital momentum L=0) and the first excited state (L=1). The aim of this study
is to find the mass and mixing angles of excited nucleons using a potential
model describing QCD. This potential is of the "Coulombian + linear" type and
we take into account some relativistic effects, namely we use essentially a
relativistic kinematic necessary for studying light flavors. By this model, we
found the proton and $\Delta (1232)$ masses respectively equal to ($968MeV$,
$1168MeV$), and the masses of the excited states are between $1564MeV$ and
$1607MeV$.


title: The Odderon: Theoretical Status and Experimental Tests

abstract:
  I review the theoretical and experimental status of the Odderon with emphasis
on recent developments.


title:
Noncommutativity, Extra Dimensions, and Power Law Running in the
  Infrared

abstract:
  We investigate the running gauge couplings of U(N) noncommutative gauge
theories with compact extra dimensions. Power law running of the trace-U(1)
gauge coupling in the ultraviolet is communicated to the infrared by
ultraviolet/infrared mixing, whereas the SU(N) factors run exactly as in the
commutative theory. This results in theories where the experimentally excluded
trace-U(1) factors decouple with a power law running of the momentum in the
extreme infrared, effectively hiding them from detection.


title: Photo-excitation of hyperons and exotic baryon in gamma N --> K Anti-K N

abstract:
  We investigate the reaction of $\gamma N \to K \bar{K} N$ focusing on the
photoproduction of $\Lambda(1520)$ and putative exotic $\Theta(1540)$. We
consider various background production mechanisms including the production of
vector mesons, tensor mesons, and other $\Lambda$ and $\Sigma$ hyperons. We
discuss the angular distribution of $\Lambda(1520)$ photoproduction cross
section and the radiative decays of $\Lambda(1520)$. We also discuss what we
expect for the invariant mass distributions if the $\Theta(1540)$ is formed in
the reaction, with the parameters studied so far. We find that the peak in the
$KN$ invariant mass distribution, if confirmed, can hardly come from the
kinematic reflections, especially, due to the tensor meson backgrounds.


title: Exotic Quark Production in ep Collisions

abstract:
  We investigate the single production and decay of charge -1/3, weak
isosinglet vectorlike exotic $D$ quarks in string inspired $E_6$ theories at
future ep colliders; THERA with $\sqrt s$=1 TeV, L=40 $pb^{-1}$ and CERN Large
Hadron Electron Collider (LHeC) with $\sqrt s$=1.4 TeV, $L=10^4$ $pb^{-1}$. We
found that an analysis of the decay modes of $D$ should probe the mass ranges
of 100-450 GeV and 100-1200 GeV at the center of mass energies, 1 and 1.4 TeV,
respectively.


title: Automatized analytic continuation of Mellin-Barnes integrals

abstract:
  I describe a package written in MATHEMATICA that automatizes typical
operations performed during evaluation of Feynman graphs with Mellin-Barnes
(MB) techniques. The main procedure allows to analytically continue a MB
integral in a given parameter without any intervention from the user and thus
to resolve the singularity structure in this parameter. The package can also
perform numerical integrations at specified kinematic points, as long as the
integrands have satisfactory convergence properties. I demonstrate that, at
least in the case of massive graphs in the physical region, the convergence may
turn out to be poor, making naive numerical integration of MB integrals
unusable. I present possible solutions to this problem, but argue that full
automatization in such cases may not be achievable.


title: Simplified Unitarity Triangles for the Lepton Sector

abstract:
  Encouraged by the latest SNO results, we consider the lepton mixing matrix in
the approximation that the nu_2 mass eigenstate is trimaximally
(democratically) mixed. This suggests a new parameterization of the remaining
mixing degrees of freedom, which eschews mixing angles, dealing instead,
directly with the complex parameter U_e3 of the mixing matrix. Unitarity
triangles then take a particularly simple form, which we hope will faciltate
comparison with experiment.


title:
The Gell-Mann-Okubo and Colemann-Glashow relations for octet and
  decuplet baryons in the $SU_q(3)$ quantum algebra

abstract:
  The q-deformed Clebsch-Gordan coefficients corresponding to the
$\lrpy{3}\times\lrpy{21}$ reduction of the $SU_q(3)$ quantum algebra are
computed. From these results and using the quantum Clebsch-Gordan coefficients
for the $\lrpy{21}\times\lrpy{21}$ reduction found by Zhong Qi Ma, the
q-deformed Gell-Mann-Okubo mass relations for octet and decuplet baryons are
determined by generalizing the procedure used for the SU(3) algebra. We also
determine the Coleman-Glashow relations for octet and decuplet baryons in the
$SU_q(3)$ algebra. Finally, by using the experimental particle masses of the
octet and decuplet baryons, two values of the $q$-parameter are found and
adjusted for the predicted masses expressions (one for the Gell-Mann-Okubo mass
relations and the other for the Coleman-Glashow relations) and a possible
physical interpretation is given.


title: Numerical Studies of QGP Instabilities and Implications

abstract:
  Because the initial shape of the QGP in a heavy ion collision is anisotropic,
the momentum distribution becomes anisotropic after a short time. This leads to
plasma instabilities, which may help explain how the plasma isotropizes. We
explain the physics of instabilities and give the latest results of numerical
simulations into their evolution. Nonabelian interactions cut off the size to
which the soft unstable fields grow, and energy in the soft fields subsequently
cascades towards more ultraviolet scales. We present first results for the
power spectrum of this cascade.


title:
Inclusive Nucleon Emission Induced by Quasi--Elastic Neutrino--Nucleus
  Interactions

abstract:
  We study the quasi--elastic contribution to the inclusive $(\nu_l,\nu_l N)$,
$(\nu_l,l^- N)$, $({\bar \nu}_l,{\bar \nu}_l N)$ and $({\bar \nu}_l,l^+ N)$
reactions in nuclei using a Monte Carlo simulation method to account for the
rescattering of the outgoing nucleon. As input, we take the reaction
probability from the microscopical many body framework developed in Phys. Rev.
{\bf C70} (2004) 055503 for charged-current induced reactions, while for
neutral currents we use results from a natural extension of the model described
in that reference. The nucleon emission process studied here is a clear signal
for neutral--current neutrino driven reactions, that can be used in the
analysis of future neutrino experiments.


title:
Threshold resummation for high-transverse-momentum Higgs production at
  the LHC

abstract:
  We study the resummation of large logarithmic QCD corrections for the process
pp ->H+ X when the Higgs boson H is produced at high transverse momentum. The
corrections arise near the threshold for partonic reaction and originate from
soft gluon emission. We perform the all-order resummation at next-to-leading
logarithmic accuracy and match the resummed result with the next-to-leading
order perturbative predictions. The effect of resummation on the Higgs
transverse momentum distribution at the LHC is discussed.


title: Phenomenology of Dirac Neutrinogenesis in Split Supersymmetry

abstract:
  In Split Supersymmetry scenarios the possibility of having a very heavy
gravitino opens the door to alleviate or completely solve the worrisome
"gravitino problem'' in the context of supersymmetric baryogenesis models. Here
we assume that the gravitino may indeed be heavy and that Majorana masses for
neutrinos are forbidden as well as direct Higgs Yukawa couplings between left
and right handed neutrinos. We investigate the viability of the mechansim known
as Dirac leptogenesis (or neutrinogenesis), both in solving the baryogenesis
puzzle and explaining the observed neutrino sector phenomenology. To
successfully address these issues, the scenario requires the introduction of at
least two new heavy fields. If a hierarchy among these new fields is
introduced, and some reasonable stipulations are made on the couplings that
appear in the superpotential, it becomes a generic feature to obtain the
observed large lepton mixing angles. We show that in this case, it is possible
simultaneously to obtain both the correct neutrino phenomenology and enough
baryon number, making thermal Dirac neutrinogenesis viable. However, due to
cosmological constraints, its ability to satisfy these constraints depends
nontrivially on model parameters of the overall theory, particularly the
gravitino mass. Split supersymmetry with m_{3/2} between 10^{5} and 10^{10} GeV
emerges as a "natural habitat" for thermal Dirac neutrinogenesis.


title: Can Inflation solve the Hierarchy Problem?

abstract:
  Inflation with tunneling from a false to a true vacuum becomes viable in the
presence of a scalar field that slows down the initial de Sitter phase. As a
by-product this field also sets dynamically the value of the Newton constant
observed today. This can be very large if the tunneling rate (which is
exponentially sensitive to the barrier) is small enough. Therefore along with
Inflation we also provide a natural dynamical explanation for why gravity is so
weak today. Moreover we predict a spectrum of gravity waves peaked at around
0.1 mHz, that will be detectable by the planned space inteferometer LISA.
Finally we discuss interesting predictions on cosmological scalar and tensor
fluctuations in the light the WMAP 3-year data.


title:
Hopf Soliton Solutions from Low Energy Effective Action of SU(2)
  Yang-Mills Theory

abstract:
  The Skyrme-Faddeev-Niemi (SFN) model which is an O(3) $\sigma$ model in three
dimensional space up to fourth-order in the first derivative is regarded as a
low-energy effective theory of SU(2) Yang-Mills theory. One can show from the
Wilsonian renormalization group argument that the effective action of
Yang-Mills theory recovers the SFN in the infrared region. However, the theory
contains another fourth-order term which destabilizes the soliton solution. In
this paper we derive an extended action including second derivative terms and
obtain soliton solutions numerically. A new topological lower bound formula is
infered for the extended action.


title: Perspectives in hadron spectroscopy

abstract:
  A brief survey is presented of selected recent results in hadron spectroscopy
and related theoretical studies. This includes the pentaquarks and hadrons
containing one or two charmed quarks or antiquarks.


title: Casimir scaling, glueballs and hybrid gluelumps

abstract:
  Assuming that the Casimir scaling hypothesis is well verified in QCD, masses
of glueballs and hybrid gluelumps (gluon with a point-like $c\bar c$ pair) are
computed within the rotating string formalism. In our model, two gluons are
attached by an adjoint string in a glueball while the gluon and the colour
octet $c\bar c$ pair are attached by two fundamental strings in a hybrid
gluelump. Masses for such exotic hadrons are computed with very few free
parameters. These predictions can serve as a guide for experimental searches.
In particular, the ground state glueballs lie on a Regge trajectory and the
lightest $2^{++}$ state has a mass compatible with some experimental
candidates.


title: Phenomenology of black hole evaporation with a cosmological constant

abstract:
  In this brief note, we investigate some possible experimental consequences of
the de-Sitter or Anti-de-Sitter background spacetime structure for
d-dimensional evaporating black holes. Possible observational signatures in
Large Hadron Collider (LHC) events are considered in the framework of the
Arkani-Hamed-Dimopoulos-Dvali (ADD) braneworld model. Lower bounds on the value
of the bulk cosmological constant required to produce visible effects are
derived thanks to a dynamical Monte-Carlo simulation. This preliminary study
has to be refined by the accurate computation of the greybody factors. It opens
a new way to investigate the structure of non-asymptotically flat
higher-dimensional spacetimes.


title: Visualizing Color Plasma Instabilities

abstract:
  I discuss recent advances in the understanding of non-equilibrium gauge field
dynamics in plasmas which have particle distributions which are locally
anisotropic in momentum space. In contrast to locally isotropic plasmas such
anisotropic plasmas have a spectrum of soft unstable modes which are
characterized by exponential growth of transverse (chromo)-magnetic fields at
short times. The long-time behavior of such instabilities depends on whether or
not the gauge group is abelian or non-abelian. I will report on recent
numerical simulations which attempt to determine the long-time behavior of an
anisotropic non-abelian plasma within hard-loop effective theory. For novelty I
will present an interesting method for visualizing the time-dependence of SU(2)
gauge field configurations produced during our numerical simulations.


title: CP violation in cosmology

abstract:
  Cosmological implications of asymmetry between particles and antiparticles
are reviewed. Three possible mechanisms of CP-violation in cosmology are
described. General features of kinetics of generation of cosmological charge
asymmetry are discussed in detail. In particular, the cyclic balance condition,
which plays the same role in time non-invariant theory as detailed balance does
in T-invariant case, is derived. Several scenarios of baryogenesis are
described with an emphasis on CP-violation mechanisms. Production of cosmic
antimatter and a possibility of its ``living'' in our neighborhood is
discussed.


title: Traveling waves in high energy QCD

abstract:
  Saturation is expected to occur when a high density of partons (mainly
gluons)- or equivalently strong fields in Quantum Chromodynamics (QCD) - is
realized in the weak coupling regime. A way to reach saturation is through the
high-energy evolution of an extended target probed at a fixed hard scale. In
this case, the transition to saturation is expected to occur from nonlinear
perturbative QCD dynamics. We discuss this approach to saturation, which is
mathematically characterized by the appearance of traveling wave patterns in a
suitable kinematical representation. A short review on traveling waves in high
energy QCD and a first evidence of this phenomenon in deep-inelastic proton
scattering are presented.


title: A novel integral representation for the Adler function

abstract:
  New integral representations for the Adler D-function and the R-ratio of the
electron-positron annihilation into hadrons are derived in the general
framework of the analytic approach to QCD. These representations capture the
nonperturbative information encoded in the dispersion relation for the
D-function, the effects due to the interrelation between spacelike and timelike
domains, and the effects due to the nonvanishing pion mass. The latter plays a
crucial role in this analysis, forcing the Adler function to vanish in the
infrared limit. Within the developed approach the D-function is calculated by
employing its perturbative approximation as the only additional input. The
obtained result is found to be in reasonable agreement with the experimental
prediction for the Adler function in the entire range of momenta $0 \le Q^2 <
\infty$.


title: Deviations From Newton's Law in Supersymmetric Large Extra Dimensions

abstract:
  Deviations from Newton's Inverse-Squared Law at the micron length scale are
smoking-gun signals for models containing Supersymmetric Large Extra Dimensions
(SLEDs), which have been proposed as approaches for resolving the Cosmological
Constant Problem. Just like their non-supersymmetric counterparts, SLED models
predict gravity to deviate from the inverse-square law because of the advent of
new dimensions at sub-millimeter scales. However SLED models differ from their
non-supersymmetric counterparts in three important ways: (i) the size of the
extra dimensions is fixed by the observed value of the Dark Energy density,
making it impossible to shorten the range over which new deviations from
Newton's law must be seen; (ii) supersymmetry predicts there to be more fields
in the extra dimensions than just gravity, implying different types of
couplings to matter and the possibility of repulsive as well as attractive
interactions; and (iii) the same mechanism which is purported to keep the
cosmological constant naturally small also keeps the extra-dimensional moduli
effectively massless, leading to deviations from General Relativity in the far
infrared of the scalar-tensor form. We here explore the deviations from
Newton's Law which are predicted over micron distances, and show the ways in
which they differ and resemble those in the non-supersymmetric case.


title: Trust but verify: The case for astrophysical black holes

abstract:
  This article is based on a pair of lectures given at the 2005 SLAC Summer
Institute. Our goal is to motivate why most physicists and astrophysicists
accept the hypothesis that the most massive, compact objects seen in many
astrophysical systems are described by the black hole solutions of general
relativity. We describe the nature of the most important black hole solutions,
the Schwarzschild and the Kerr solutions. We discuss gravitational collapse and
stability in order to motivate why such objects are the most likely outcome of
realistic astrophysical collapse processes. Finally, we discuss some of the
observations which -- so far at least -- are totally consistent with this
viewpoint, and describe planned tests and observations which have the potential
to falsify the black hole hypothesis, or sharpen still further the consistency
of data with theory.


title:
Influence of QED Corrections on the Orientation of Chiral Symmetry
  Breaking in the NJL model

abstract:
  We study QED corrections to chiral symmetry breaking in the
Nambu--Jona-Lasinio (NJL) model with two flavors of quarks. In this model, the
isospin symmetry is broken by the differences between the current quark masses
and the electromagnetic charges of the up and down quarks. To leading order in
the 1/N expansion, we calculate the effective potential of the model with
one-loop QED corrections at finite temperature.
  Evaluating the effective potential, we study the influence of the isospin
symmetry breaking on the orientation of chiral symmetry breaking.
  The current quark mass plays an essential role in maintaining the orientation
of the chiral symmetry breaking.
  If the average of the up and down quark masses is small enough, we find a
phase in which the pion field has non-vanishing expectation value and dynamical
CP violation takes place.


title: Quark and lepton masses and mixing in the landscape

abstract:
  Even if quark and lepton masses are not uniquely predicted by the fundamental
theory, as may be the case in the string theory landscape, nevertheless their
pattern may reveal features of the underlying theory. We use statistical
techniques to show that the observed masses appear to be representative of a
scale invariant distribution, rho(m) ~ 1/m. If we extend this distribution to
include all the Yukawa couplings, we show that the resulting CKM matrix
elements typically show a hierarchical pattern similar to observations. The
Jarlskog invariant measuring the amount of CP violation is also well reproduced
in magnitude. We also apply this framework to neutrinos using the seesaw
mechanism. The neutrino results are ambiguous, with the observed pattern being
statistically allowed even though the framework does not provide a natural
explanation for the observed two large mixing angles. Our framework highly
favors a normal hierarchy of neutrino masses. We also are able to make
statistical predictions in the neutrino sector when we specialize to situations
consistent with the known mass differences and two large mixing angles. Within
our framework, we show that with 95% confidence the presently unmeasured MNS
mixing angle sin theta_{13} is larger than 0.04 and typically of order 0.1. The
leptonic Jarlskog invariant is found to be typically of order 10^{-2} and the
magnitude of the effective Majorana mass m_{ee} is typically of order 0.001 eV.


title: Nuclear effects on open charm production in p+A reactions

abstract:
  We calculate and resum the nuclear enhanced power corrections from the final
state partonic scattering in nuclear matter to open charm production and
correlations. In p+A reactions, we find that single and double inclusive D
mesons can be suppressed as much as the neutral pions from the dynamical high
twist shadowing. Effects of initial state energy loss in p+A collisions are
also investigated and may lead to significantly weaker transverse momentum
dependence of the nuclear suppression.


title: How is chiral symmetry restored at finite density?

abstract:
  Taking into account pseudoscalar as well as scalar condensates, we reexamine
the chiral restoration path on the chiral manifold. We shall see both
condensates coherently produce a density wave at a certain density, which
delays chiral restoration as density or temperature is increased.


title:
Clean Prediction of \CP violating processes $\psi$, $\phi$ and
  $\Upsilon(1S)$ decay to KsKs and KLKL

abstract:
  The ratio of $K_S K_S$ ($K_L K_L$) and $K_S K_L$ production rates is
calculated by considering $K^0 - K^0bar$ oscillation in $J/\psi \to K^0K^0bar$
decay. The theoretical uncertainty due to strong interaction in $J/\psi$ decay
is completely canceled in the ratio, therefore, the absolute branching
fractions of the \CP violating processes of $J/\psi \to K_S K_S $ and $K_L K_L$
can be cleanly and model-independently determined in case that $J/\psi \to K_S
K_L$ decay is precisely measured. In the future $\tau$-Charm factory, the
expected \CP violating process of $J/\psi \to K_S K_S $ should be reached. It
is important to measure $J/\psi$ to $K_S K_S$ and K_S K_L decays
simultaneously, so that many systematic errors will be canceled. More precise
measurements are suggested to examine the predicted isospin relation in $J/\psi
\to KKbar$ decays. All results can be extended to decays of other vector
quarkonia, $\phi$, $\psi(2S)$ and $\Upsilon(1S)$ and so on.


title:
Strangeness spin, magnetic moment and strangeness configurations of the
  proton

abstract:
  The implications of the empirical signatures for the positivity of the
strangeness magnetic moment $\mu_s$, and the negativity of the strangeness
contribution to the proton spin $\Delta_s$, on the possible $uuds\bar s$
configurations of five quarks in the proton are analyzed. The empirical signs
for the values of these two observables can only be obtained in configurations
where the $uuds$ system is orbitally excited and the $\bar s$ quark is in the
ground state. The configurations, in which the $\bar s$ is orbitally excited,
which include the conventional $K^+\Lambda^0$ congfiguration, with the
exception of that, in which the $uuds$ component has spin 2, yield negative
values for $\mu_s$. Here the strangeness spin $\Delta_s$, the strangeness
magnetic moment $\mu_s$ and the axial coupling constant $G_A^s$ are calculated
for all possible configurations of the $uuds\bar s$ component of the proton. In
the configuration with $[4]_{FS}[22]_F[22]_S$ flavor-spin symmetry, which is
likely to have the lowest energy, $\mu_s$ is positive and $\Delta_s\simeq
G_A^s\simeq -1/3\mu_s$.


title: Saturation in diffractive deep inelastic eA scattering

abstract:
  In this paper we investigate the saturation physics in diffractive deep
inelastic electron-ion scattering. We estimate the energy and nuclear
dependence of the ratio $\sigma^{diff}/\sigma^{tot}$ and predict the $x_{\pom}$
and $\beta$ behavior of the nuclear diffractive structure function
$F_{2,A}^{D(3)}(Q^2, \beta, x_{IP})$. Moreover, we analyze the ratio
$R^{diff}_{A1,A2}(Q^2, \beta, x_{IP}) = F_{2,A1} ^{D(3)}/F_{2,A2} ^{D(3)}$,
which probes the nuclear dependence of the structure of the Pomeron. We show
that saturation physics predicts that approximately 37 % of the events observed
at eRHIC should be diffractive.


title: Quasiparticle model for deconfined matter and the nucleation of hadrons

abstract:
  Assuming a first-order chiral transition scenario, we study the process of
phase conversion driven by homogeneous nucleation. We adopt a quasiparticle
model whose parameters are fit to lattice QCD data to describe the pressure at
high temperature in the deconfined sector, and a bag model equation of state
for pions in the low-temperature sector. We compute the critical radius and
nucleation rate in the thin-wall approximation, and compare the results to the
ones obtained using the bag model and the linear $\sigma$ model.


title: Pomeron Loops in High Energy QCD

abstract:
  We discuss the QCD evolution equations governing the high energy behavior of
scattering amplitudes at the leading logarithmic level. This hierarchy of
equations accommodates normal BFKL dynamics, Pomeron mergings and Pomeron
splittings. Pomeron loops are built in the course of evolution and the
scattering amplitudes satisfy the unitarity bound.


title: Majorana Neutrino Mixing

abstract:
  The most plausible see-saw explanation of the smallness of the neutrino
masses is based on the assumption that total lepton number is violated at a
large scale and neutrinos with definite masses are Majorana particles. In this
review we consider in details difference between Dirac and Majorana neutrino
mixing and possibilities of revealing Majorana nature of neutrinos with
definite masses.


title:
Unifying the Fixed Order Evolution of Fragmentation Functions with the
  Modified Leading Logarithm Approximation

abstract:
  An approach which unifies the Double Logarithmic Approximation at small x and
the leading order DGLAP evolution of fragmentation functions at large x is
presented. This approach reproduces exactly the Modified Leading Logarithm
Approximation, but is more complete due to the degrees of freedom given to the
quark sector and the inclusion of the fixed order terms. We find that data from
the largest x values to the peak region can be better fitted than with other
approaches.


title:
Electromagnetic radiative corrections in parity-violating
  electron-proton scattering

abstract:
  QED radiative corrections have been calculated for leptonic and hadronic
variables in parity-violating elastic ep scattering. For the first time, the
calculation of the asymmetry in the elastic radiative tail is performed without
the peaking-approximation assumption in hadronic variables configuration. A
comparison with the PV-A4 data validates our approach. This method has been
also used to evaluate the radiative corrections to the parity-violating
asymmetry measured in the G0 experiment. The results obtained are here
presented.


title:
Search for the proton decay p->K+antineutrino in the large liquid
  scintillator low energy neutrino astronomy detector LENA

abstract:
  The LENA (Low Energy Neutrino Astronomy) detector is proposed to be a
large-volume liquid-scintillator device which will be highly suitable for the
investigation of a variety of topics in astrophysics, geophysics and particle
physics. In this paper, the potential of such a detector concerning the search
for proton decay in the SUSY favored decay channel p->K+antineutrino is
investigated. Based on Geant4, Monte Carlo simulations of the proton decay in
the LENA detector as well as of the background radiation in the detection
energy windows have been developed. From these simulations an efficiency of 65%
for the detection of a possible proton decay has been determined. Within ten
years of measuring time a lower limit for the proton lifetime, concerning the
decay channel investigated, of tau>4.10^{34} y could be reached.


title: Re-evaluation of the Gottfried sum using neural networks

abstract:
  We provide a determination of the Gottfried sum from all available data,
based on a neural network parametrization of the nonsinglet structure function
F_2. We find S_G=0.244 +- 0.045, closer to the quark model expectation S_G=1/3
than previous results. We show that the uncertainty from the small x region is
somewhat underestimated in previous determinations.


title:
Dynamics of chiral oscillations - A comparative analysis with
  spin-flipping

abstract:
  Chiral oscillation as well as spin flipping effects correspond to quantum
phenomena of fundamental importance in the context of particle physics and, in
particular, of neutrino physics. From the point of view of first quantized
theories, we are specifically interested in appointing the differences between
chirality and helicity by obtaining their dynamic equations for a fermionic
Dirac-type particle (neutrino). We also identify both effects when the
non-minimal coupling with an external (electro)magnetic field in the neutrino
interacting Lagrangian is taken into account. We demonstrate that, however,
there is no constraint between chiral oscillations, when it takes place in
vacuum, and the process of spin flipping related to the helicity quantum
number, which does not take place in vacuum. To conclude, we show that the
origin of chiral oscillations (in vacuum) can be interpreted as position very
rapid oscillation projections onto the longitudinal direction of momentum.


title: High Mass Particles Near Threshold

abstract:
  A consequence of the Higgs mechanism is that high mass particles, such as the
Z-boson, the W-boson and the t-quark, are predicted to have masses that depend
on the process by which they are produced. Thus, for example, particles
produced singly are predicted to have higher masses than those produced in a
pair near threshold. Quantitative details of this prediction are presented and
discussed within the context of the current experimental situation.


title:
On Quadratic Divergences in Supergravity, Vacuum Energy and the
  Supersymmetric Flavor Problem

abstract:
  We examine the phenomenological consequences of quadratically divergent
contributions to the scalar potential in supergravity effective Lagrangians. We
focus specifically on the effect of these corrections on the vacuum
configuration of scalar fields in softly-broken supersymmetric theories and the
role these corrections play in generating non-diagonal soft scalar masses. Both
effects can only be properly studied when the divergences are regulated in a
manifestly supersymmetric manner -- something which has thus far been neglected
in past treatments. We show how a supersymmetric regularization can impact past
conclusions about both types of phenomena and discuss what types of high-energy
theories are likely to be safe from unwanted flavor-changing neutral current
interactions in the context of supergravity theories derived from heterotic
string compactifications.


title: Charged Higgs production: higher-order corrections

abstract:
  I present a calculation of higher-order radiative corrections to charged
Higgs production in association with a top quark via the process bg -> tH-.
Results for charged Higgs production at the LHC are presented, including the
dependence of the cross section on the charged Higgs mass, the top quark mass,
the factorization and renormalization scales, and tan beta. I show that the
theoretical prediction for the cross section is significantly enhanced and is
greatly stabilized when the higher-order corrections are included.


title: Anomalous Hydrodynamics

abstract:
  Our goal is to examine the role of anomalies in the hydrodynamic regime of
field theories. We employ methods based on gauge/gravity duality to examine
R-charge anomalies in the hydrodynamic regime of stronly t'Hooft coupled, large
N, N = 4 Super Yang-Mills. We use a single particle spectrum treatment based on
the familiar "level crossing" picture of chiral anomalies to investigate
thermalized, massless QED. In each case, we work in the presence of a
homogeneous background magnetic field, and find the same result. Regardless of
whether a paricular current is anomalously non-conserved or not, as long as it
participates in an anomalous 3-pt. correlator, its constitutive relation
recieves a new term, proportional to a product of the anomaly coefficient, the
magnetic field, and any charge density participating in the anomaly. This
agrees with results found by Alekseev et.al. for QED. We include a general,
symmetry based argument for the presence of such terms, and use linear response
theory to determine their coefficients in a model with anomalous global
charges. This last method we apply to briefly examine baryon transport in
chiral QCD in a strong magnetic field.


title: Testing the mechanism of QGP-induced energy loss

abstract:
  We present an analytic model of jet quenching, based on the (D)GLV energy
loss formalism, to describe the system size dependence of QGP-induced parton
absorption in relativistic heavy ion collisions. Numerical simulations of the
transverse momentum dependence of jet quenching are given for central Au+Au and
Cu+Cu reactions. Low pT dijet correlations are shown to be sensitive to the
reappearance of the lost energy as soft hadrons. At high pT we find that the
attenuation of dihadrons is similar to that of single inclusive particles.
Comparison to recent data from PHENIX and STAR is given as test of the jet
quenching theory.


title:
Constraining renormalon effects in lattice determination of heavy quark
  mass

abstract:
  The Borel summation technique of infrared renormalons is applied to the
lattice determination of heavy quark mass. With Borel summation a physical
heavy quark pole mass and binding energy of a heavy-light meson can be defined
in a rigorous and calculable manner. A notable feature of the Borel summation,
compared to the usual perturbative cancellation of IR renormalons, is an
automatic scale separation. The two approaches of handling renormalon
divergence are compared in the B-meson as well as in an (imaginary) heavy-light
meson with a mass much larger than the inverse of the lattice spacing.


title: Study of W-exchange Mode $D^0 \to \phi \bar K^0$

abstract:
  We calculate the branching ratio of $D^0 \to \phi \bar K^0$ decay using the
so-called perturbation QCD approach based on $k_T$ factorization. Our result
shows this branching ratio is $(8.7 \pm1.4)\times 10^{-3}$, which is consistent
with experimental data. We hope the CLEO-C and BES-III can measure it more
accurately, which will help us to understand QCD dynamics and $D$ meson weak
decays.


title:
General analysis of polarization phenomena in $ e^++e^-\to N+\bar N$ for
  axial parametrization of two--photon exchange

abstract:
  General properties of the differential cross section and of the polarization
observables are derived for the $e^++e^-\to N+\bar N$ reaction, in presence of
two--photon exchange. Polarization effects are investigated for longitudinally
polarized electron and polarized antinucleon and/or polarized nucleon in the
final state. The single--spin asymmetry induced by the transverse polarization
of the electron beam is also discussed.


title:
Charged lepton electric dipole moments with the localized leptons and
  the new Higgs doublet in the two Higgs doublet model

abstract:
  We study the lepton electric dipole moments in the split fermion scenario, in
the two Higgs doublet model, where the new Higgs scalars are localized around
the origin in the extra dimension, with the help of the localizer field. We
observe that the numerical value of the electron (muon, tau) electric dipole
moment is at the order of the magnitude of 10^{-31} (10^{-24}, 10^{-22}) (e-cm)
and this quantity is sensitive the new Higgs localization in the extra
dimension.


title: Numerical Simulation of Non-Abelian Particle-Field Dynamics

abstract:
  Numerical 1D-3V solutions of the Wong-Yang-Mills equations with anisotropic
particle momentum distributions are presented. They confirm the existence of
plasma instabilities for weak initial fields and their saturation at a level
where the particle motion is affected, similar to Abelian plasmas. The
isotropization of the particle momenta by strong random fields is shown
explicitly, as well as their nearly exponential distribution up to a typical
hard scale, which arises from scattering off field fluctuations. By variation
of the lattice spacing we show that the effects described here are independent
of the UV field modes near the end of the Brioullin zone.


title:
QCD corrections to forward-backward charge asymmetries in l- l+ j
  production at hadron colliders

abstract:
  The large cross sections for gauge boson production at the Fermilab Tevatron
and the CERN Large Hadron Collider (LHC) might give a chance to determine the
electroweak parameters with high precision. We calculated two different
forward-backward charge asymmetries (A^CS_FB and A^j_FB) of lepton pairs in
events with a large transverse momentum jet p p (pbar) -> Z, gamma* + j -> e-
e+ j at next-to-leading order (NLO), O(alpha_s) corrections, making use of the
Monte Carlo programs MCFM and ALPGEN. These observables could provide a new
determination of the weak mixing angle sin^2 theta^lept_eff (M_Z^2) with a
statistical precision for each lepton flavour of 10^{-3} (7 x 10^{-3}) at LHC
(Tevatron). If b jets are identified, a new asymmetry with respect to the b
quark (A^b_FB) can also be measured with a statistical precision of 2 x 10^{-3}
(4 x 10^{-2}) at LHC (Tevatron). Finally, we comment on the dependence of our
results on various sources of uncertainties and compare, in the case of A^b_FB,
the exact result with an approximation that might be more suitable when
performing a realistic experimental analysis.


title: Generating the Baryon Asymmetry of the Universe in Split Fermion Models

abstract:
  The origin of the matter-antimatter asymmetry of the universe is one of the
major unsolved problems in cosmology and particle physics. In this paper, we
investigate the recently proposed possibility that split fermion models --
extra dimensional models where the standard model fermions are localized to
different points around the extra dimension -- could provide a means to
generate this asymmetry during the phase transition of the localizing scalars.
After setting up the scenario that we consider, we use a single fermion toy
model to estimate the reflection coefficients for scattering off the phase
boundary using a more realistic scalar profile than previous work resulting in
a different Kaluza Klein spectrum. The value we calculate for $n_B/s$ is
consistent with the mechanism being the source of the baryon asymmetry of our
universe provided the $B-L$ violating processes have an efficiency of order
$10^{-5}$.


title: Volume Effect of Bound States in Quark Gluon Plasma

abstract:
  Bound states, such as $qq$ and $q\bar{q}$, may exist in the Quark Gluon
Plasma. As the system is at high density, the volume of the bound states may
evoke a reduction to the phase space. We introduce an extended bag model to
investigate qualitatively the volume effect on the properties of the system. We
find a limit temperature where the bound states start to be completely melted.


title:
Baryon and lepton number violation rates across the electroweak
  crossover

abstract:
  We point out that the results of many baryogenesis scenarios operating at or
below the TeV scale are rather sensitive to the rate of anomalous fermion
number violation across the electroweak crossover. Assuming the validity of the
Standard Model of electroweak interactions, and making use of previous
theoretical work at small Higgs masses, we estimate this rate for
experimentally allowed values of the Higgs mass (m_H = 100 ... 300 GeV). We
also elaborate on how the rate makes its appearance in (leptogenesis based)
baryogenesis computations.


title: Excited Baryons in the 1/N_c Expansion

abstract:
  We review results for the mass spectrum of orbitally excited baryons obtained
in the $1/N_c$ expansion. We show the dependence of various contributions to
the mass operator as a function of the excitation energy.


title: The CP-asymmetry in resonant leptogenesis

abstract:
  We study the resonantly enhanced CP-asymmetry in the decays of nearly
mass-degenerate heavy right-handed Majorana neutrinos for which different
formulae have been presented in the literature, depending on the method used to
calculate it. We consider two different techniques and show that they lead to
the same result, thereby reconciling the different approaches.


title: Sivers function: SIDIS data, fits and predictions

abstract:
  The most recent data on the weighted transverse single spin asymmetry
A_{UT}^{\sin(\phi_h-\phi_S)} from HERMES and COMPASS collaborations are
analysed within LO parton model; all transverse motions are taken into account.
Extraction of the Sivers function for u and d quarks is performed. Based on the
extracted Sivers functions, predictions for A_{UT}^{\sin(\phi_h-\phi_S)}
asymmetries at JLab are given; suggestions for further measurements at COMPASS,
with a transversely polarized hydrogen target and selecting favourable
kinematical ranges, are discussed. Predictions are also presented for Single
Spin Asymmetries (SSA) in Drell-Yan processes at RHIC and GSI.


title: Naturalness and Higgs Decays in the MSSM with a Singlet

abstract:
  The simplest extension of the supersymmetric standard model - the addition of
one singlet superfield - can have a profound impact on the Higgs and its
decays. We perform a general operator analysis of this scenario, focusing on
the phenomenologically distinct scenarios that can arise, and not restricting
the scope to the narrow framework of the NMSSM. We reexamine decays to four b
quarks and four tau's, finding that they are still generally viable, but at the
edge of LEP limits. We find a broad set of Higgs decay modes, some new,
including those with four gluon final states, as well as more general six and
eight parton final states. We find the phenomenology of these scenarios is
dramatically impacted by operators typically ignored, specifically those
arising from D-terms in the hidden sector, and those arising from weak-scale
colored fields. In addition to sensitivity of m_Z, there are potential tunings
of other aspects of the spectrum. In spite of this, these models can be very
natural, with light stops and a Higgs as light as 82 GeV. These scenarios
motivate further analyses of LEP data as well as studies of the detection
capabilities of future colliders to the new decay channels presented.


title: Hybrid Textures of Neutrino Mass Matrix

abstract:
  We present analyses of the sixty hybrid textures of neutrino mass matrix,
which have an equality of matrix elements and one zero. These textures are
possibly derived in the models with discrete flavor symmetry. Only six textures
among sixty ones are excluded by the present experimental data. Since there are
many textures which give similar predictions, the textures are classified based
on the numerical results. The neutrinoless double beta decay is also examined
in these textures. Our results suggest that there remain still rich structures
of the neutrino mass matrix in the phenomenological point of view.


title: Comment on "Chiral Suppression of Scalar-Glueball Decay"

abstract:
  We give a comment on the paper ``Chiral Suppression of Scalar-Glueball
Decay''. By taking account of the instanton effect, we show SU(3) chiral
symmetry is well established.


title: Lepton flavor violation in Higgs boson decays

abstract:
  We discuss lepton flavor violation (LFV) associated with tau leptons in the
framework of the two-Higgs-doublet model. Current data for rare tau decays
provide substantial upper limits on the LFV Yukawa couplings in the large
$\tan\beta$ region where $\tan\beta$ is the ratio of vacuum expectation values
of the two Higgs doublets. We show that measuring the LFV Higgs boson decays $h
\to \tau^\pm \mu^\mp$ at future colliders can be useful to further constrain
the LFV couplings especially in the relatively small $\tan\beta$ region.


title:
Checking the transverse Ward-Takahashi relation at one loop order in
  4-dimensions

abstract:
  Some time ago Takahashi derived so called {\it transverse} relations relating
Green's functions of different orders to complement the well-known
Ward-Green-Takahashi identities of gauge theories by considering wedge rather
than inner products. These transverse relations have the potential to determine
the full fermion-boson vertex in terms of the renormalization functions of the
fermion propagator. He & Yu have given an indicative proof at one-loop level in
4-dimensions. However, their construct involves the 4th rank Levi-Civita tensor
defined only unambiguously in 4-dimensions exactly where the loop integrals
diverge. Consequently, here we explicitly check the proposed transverse
Ward-Takahashi relation holds at one loop order in $d$-dimensions, with
$d=4+\epsilon$.


title: Final State Interaction In $B\to KK$ Decays

abstract:
  We study the final state interaction effects in $B\to KK$ decays. We find
that the $t$ channel one-particle-exchange diagrams cannot enhance the
branching ratios of $\bar{B^0}\to K^0\bar{K^0}$ and $B^-\to K^0K^-$ very
sizably. For the pure annihilation process $\bar{B^0}\to K^+K^-$, the obtained
branching ratio by final state interaction is at ${\cal{O}}(10^{-8})$.


title: Exceptional Supersymmetric Standard Model

abstract:
  We discuss some phenomenological aspects of an $E_6$ inspired supersymmetric
standard model with an extra $U(1)_{N}$ gauge symmetry under which right-handed
neutrinos have zero charge, allowing a conventional see-saw mechanism. The
$\mu$ problem is solved in a similar way to the NMSSM, but without the
accompanying problems of singlet tadpoles or domain walls. The above
exceptional supersymmetric standard model (ESSM) involves the low energy matter
content of three 27 representations of $E_6$, which is broken at the GUT scale,
and allows gauge coupling unification due to an additional pair of Higgs-like
doublets. The ESSM predicts a $Z'$ boson and exotic quarks which, if light
enough, will provide spectacular new physics signals at the LHC. We study the
LHC phenomenology of the $Z'$ and extra quarks, including their production and
decay signatures particular to the ESSM. We also discuss the two-loop upper
bound on the mass of the lightest CP-even Higgs boson, and show that it can be
significantly heavier than in either the MSSM or the NMSSM.


title:
How sensitive are high-pt electron spectra at RHIC to heavy quark energy
  loss?

abstract:
  In nucleus-nucleus collisions, high-pt electron spectra depend on the medium
modified fragmentation of their massive quark parents, thus giving novel access
to the predicted mass hierarchy of parton energy loss. Here we calculate these
spectra in a model, which supplements the perturbative QCD factorization
formalism with parton energy loss. In general, we find - within large errors -
rough agreement between theory and data on the single inclusive electron
spectrum in pp, its nuclear modification factor, and its azimuthal anisotropy.
However, the nuclear modification factor depends on the relative contribution
of charm and bottom production, which we find to be affected by large
perturbative uncertainties. In order for electron measurements to provide a
significantly more stringent test of the expected mass hierarchy, one must then
disentangle the b- and c-decay contributions, for instance by reconstructing
the displaced decay vertices.


title: Ultrasoft Quark Damping in Hot QCD

abstract:
  We determine the quark damping rates in the context of next-to-leading order
hard-thermal-loop summed perturbation of high-temperature QCD where weak
coupling is assumed. The quarks are ultrasoft. Three types of divergent
behavior are encountered: infrared, light-cone and at specific points
determined by the gluon energies. The infrared divergence persists and is
logarithmic whereas the two others are circumvented.


title: On the smallness of the cosmological constant in SUGRA models

abstract:
  In no--scale supergravity global symmetries protect local supersymmetry and a
zero value for the cosmological constant. We consider the breakdown of these
symmetries and present a minimal SUGRA model motivated by the multiple point
principle, in which the total vacuum energy density is naturally tiny. In order
to reproduce the observed value of the cosmological constant and preserve gauge
coupling unification, an additional pair of $5+\bar{5}$--plets of superfields
has to be included in the particle content of the considered model. These extra
fields have masses of the order of the supersymmetry breaking scale; so they
can be detected at future colliders. We also discuss the supersymmetry
breakdown and possible solution of the cosmological constant problem by MPP in
models with an enlarged gauge symmetry.


title: Predicting the Seesaw Scale in a Minimal Bottom-Up Extension of MSSM

abstract:
  We analyze a minimal bottom-up seesaw scenario where we require the theory to
satisfy three phenomenological conditions: (i)it is supersymmetric; (ii) it has
a local B-L symmetry as part of the SU(2)_L x SU(2)_R x U(1)_{B-L} gauge theory
to implement the seesaw mechanism and (iii) B-L symmetry breaking is such that
it leaves R-parity unbroken giving a naturally stable dark matter. We show that
in such a theory, one can predict the seesaw scale for neutrino masses to be
M_R ~ \sqrt{M_{SUSY} M_{Pl}} ~ 10^{11} GeV. We show that the ground state with
this property is a stable minimum and is lower than possible electric charge
violating minimum in this theory. Such models in their generic version are
known to predict the existence of a light doubly charged Higgs boson and
Higgsino which can be searched for in collider experiments. We give expressions
for their masses in this minimal version. We then indicate how one can get
different expectation values for the MSSM Higgs doublets in the theory required
to have realistic quark masses.


title:
The nucleon and Delta-resonance masses in relativistic chiral
  effective-field theory

abstract:
  We study the chiral behavior of the nucleon and $\Delta$-isobar masses within
a manifestly covariant chiral effective-field theory, consistent with the
analyticity principle. We compute the $\pi N$ and $\pi\Delta$ one-loop
contributions to the mass and field-renormalization constant, and find that
they can be described in terms of universal relativistic loop functions,
multiplied by appropriate spin, isospin and coupling constants. We show that
these relativistic one-loop corrections, when properly renormalized, obey the
chiral power-counting and vanish in the chiral limit. The results including
only the $\pi N$-loop corrections compare favorably with the lattice QCD data
for the pion-mass dependence of the nucleon and $\Delta$ masses, while
inclusion of the $\pi \Delta$ loops tends to spoil this agreement.


title: Tests of Lorentz Symmetry with Penning Traps and Antihydrogen

abstract:
  Possibilities for testing Lorentz symmetry using precision experiments with
antiprotons in Penning traps and with antihydrogen spectroscopy are reviewed.
Estimates of bounds on relevant coefficients for Lorentz violation in the
Standard-Model Extension (SME) are considered.


title: Conical flow in a medium with variable speed of sound

abstract:
  In high energy nuclear collisions, QCD jets deposit a large fraction of their
energy into the produced matter. It has been proposed that as such matter
behaves as a liquid with a very small viscosity, a fraction of this energy goes
into a collective excitation called the ``conical flow'', similar e.g. to the
sonic booms generated by the supersonic planes. In this work we study the
effect of time-dependent speed of sound on the development of the conical wave.
We show that the expansion of matter and the decrease of $c_s$ leads to an
increase of observable manifestations of the conical flow. We also show that if
the QCD phase transition is of the first order (and thus with vanishing speed
of sound in the mixed phase) the wave must split into two, with opposite
directions. We then argue that it is not the case experimentally, which
supports the conclusion that the QCD phase transition is $not$ of the first
order.


title:
One-loop amplitudes for four-point functions with two external massive
  quarks and two external massless partons up to O(epsilon^2)

abstract:
  We present complete analytical ${\mathcal O}(\epsilon^2)$ results on the
one-loop amplitudes relevant for the NNLO quark-parton model description of the
hadroproduction of heavy quarks as given by the so-called loop-by-loop
contributions. All results of the perturbative calculation are given in the
dimensional regularization scheme. These one-loop amplitudes can also be used
as input in the determination of the corresponding NNLO cross sections for
heavy flavor photoproduction, and in photon-photon reactions.


title: Vacuum Cherenkov radiation in Maxwell-Chern-Simons electrodynamics

abstract:
  We study the Cherenkov effect in the context of the Maxwell-Chern-Simons
(MCS) limit of the Standard Model Extension. We present a method to determine
the exact radiation rate for a point charge.


title:
On lepton flavor mass-degeneracy-deviation hierarchies and QD-neutrino
  mass

abstract:
  Two guiding new phenomenological flavor and flavor-electroweak ideas are
expounded in this paper: (I) Oppositeness relation between neutrino and Charged
Lepton Mass-Degeneracy-Deviation quantities. With inputs from the mass and
neutrino oscillation data, it enables two independent estimations of the
neutrino masses m =(0.11-0.30)eV and m =(0.11-0.16) eV. Small value of the
neutrino oscillation hierarchy parameter is a consistency condition. (II)
Essential connection between lepton mass hierarchies and low energy electroweak
coupling constants. It enables an independent estimation of the QD-neutrino
mass m = (0.11-0.14) eV, and renders three sequential charged lepton copies
into one flavor system with the elementary charge encoded in the three-flavor
mass hierarchy. An exact relation between the fine structure constant at Q2=0
and the experimental charged lepton mass-ratio parameter exp(-5) is observed.
Experimental evidence is suggesting that this parameter has physical meaning of
a dimensionless universal parameter that links flavor and electroweak
quantities in accord with the guiding idea (II).


title:
Generalized dual symmetry of nonabelian theories and the freezing of
  \alpha_s

abstract:
  The quantum Yang-Mills theory, describing a system of fields with non-dual
(chromo-electric g) and dual (chromo-magnetic \tilde g) charges and revealing
the generalized dual symmetry, is developed by analogy with the Zwanziger
formalism in QED. The renormalization group equations (RGEs) for pure
nonabelian theories are analysed for both constants, \alpha = g^2 / 4\pi and
\tilde\alpha = {\tilde g}^2 / 4\pi. The pure SU(3) \times \widetilde{SU(3)}
gauge theory is investigated as an example. We consider not only monopoles, but
also dyons. The behaviour of the total SU(3) \beta-function is investigated in
the whole region of \alpha \equiv \alpha_s: 0 \le \alpha < \infty. It is shown
that this \beta-function is antisymmetric under the interchange \alpha
\longleftrightarrow 1/\alpha and is given by the well-known perturbative
expansion not only for \alpha \ll 1, but also for \alpha \gg 1. Using an idea
of the Maximal Abelian Projection by t' Hooft, we considered the formation of
strings - the ANO flux tubes - in the Higgs model of scalar monopole (or dyon)
fields. In this model we have constructed the behaviour of the \beta-function
in the vicinity of the point \alpha = 1, where it acquires a zero value.
Considering the phase transition points at \alpha \approx 0.4 and \alpha
\approx 2.5, we give the explanation of the freezing of \alpha_s. The evolution
of \alpha_s^{-1}(\mu) and the behaviour of V_{eff}(\mu) are investigated for
both, perturbative and non-perturbative regions of QCD. It was shown that the
effective potential has a minimum, ensured by the dual sector of QCD. The gluon
condensate F^2_0, corresponding to this minimum, is predicted: F^2_0 \approx
0.15 GeV^4, in agreement with the well-known results.


title:
Nonabelian Discrete Family Symmetry to Soften the SUSY Flavor Problem
  and to Suppress Proton Decay

abstract:
  Family symmetry could explain large mixing of the atmospheric neutrinos. The
same symmetry could explain why the flavor changing current processes in
supersymmetric standard models can be so suppressed. It also may be able to
explain why the proton is so stable. We investigate these questions in a
supersymmetric, renormalizable extension of the standard model, which possess a
family symmetry based on a binary dihedral group Q_6. We find that the
amplitude for \mu \to e+\gamma enjoys a suppression factor proportional to
|(V_{MNS})_{e3}| ~ m_e/(\sqrt{2}m_\mu) ~ 3.4\times 10^{-3}, and that B(p \to
K^0 \mu^+)/B(p \to K^0 e^+) ~ |(V_{MNS})_{e3}|^2 ~ 10^{-5}, where V_{MNS} is
the neutrino mixing matrix.


title: Study of $B_{s}\to \pi \rho$ decays in the perturbative QCD approach

abstract:
  In this note, we calculate the branching ratio and CP asymmetry parameters of
$B_s\to\pi\rho$ in the framework of perturbative QCD approach based on $k_T$
factorization. This decay can occur only via annihilation diagrams in the
Standard Model. We find that (a)the charge averaged
$Br(B_s\to\pi^{+}\rho^{-}+\pi^{-}\rho^{+})$ is about $(9-12)\times10^{-7}$;
$Br(B_s\to\pi^{0}\rho^{0}) \simeq 4\times10^{-7}$; and (b) there are sizable CP
asymmetries in the processes, which can be tested in the near future Large
Hadron Collider beauty experiments (LHC-b) at CERN or BTeV experiments at
Fermilab.


title: Covariant oscillator quark model for glueballs and baryons

abstract:
  An analytic resolution of the covariant oscillator quark model for a
three-body system is presented. Our harmonic potential is a general quadratic
potential which can simulate both a $\delta$-shape configuration or a
simplified Y-configuration where the junction is located at the center of mass.
The mass formulas obtained are used to compute glueball and baryon spectra. We
show that the agreement with lattice and experimental data is correct if the
Casimir scaling hypothesis is assumed. It is also argued that our model is
compatible with pomeron and odderon approaches.


title: Neutrino events from SN1987A revisited

abstract:
  The e- and e+ energy spectra from the SN1987A Supernova neutrino burst
interactions are calculated and compared to the observed spectra in
Kamiokande-II and IMB experiments. Neutrino oscillations in Supernova and
regeneration effects in the Earth, for four combinations of neutrino mass
hierarchy (Direct/Inverted) and the value of the mixing angle Theta_13
(Large/Small), are taken into account. The influence of the (anti)neutrino
production spectra in Supernova on the observed, in Kamiokande-II and IMB
detectors, e-/e+ spectra is shown.


title: Sivers effect in Drell Yan at RHIC

abstract:
  On the basis of a fit to the Sivers effect in deep-inelastic scattering, we
make predictions for single-spin asymmetries in the Drell-Yan process at RHIC.


title:
\tau^- \to \mu^- \pi^0(\eta,\eta') Decays in New Physics Scenarios
  beyond the Standard Model

abstract:
  The semileptonic decays $\tau^- \to \mu^- M (M=\pi^0,\eta,\eta')$ could be
sensitive probe for new physics scenarios with lepton flavor violation(LFV).
Motivated by the recent Belle measurement, we investigate these decays in type
III two-Higgs-doublet model (2HDM III), R-parity violating supersymmetric
models(RPV SUSY) and flavor changing $Z'$ models with family non-universal
couplings, respectively. In these new physics scenarios, there are LFV
couplings at tree level. Our results have shown that the decays are very
sensitive to the LFV couplings and could be enhanced to the present
experimental sensitivities. We have derived strong bounds on relevant couplings
of these models, which may be useful for further relevant studies.


title:
The Angular Distribution of B0-> K*0(->K-pi+)l+l- at Large Recoil in and
  Beyond the SM

abstract:
  We discuss, in detail, the K* polarization states in the exclusive B meson
decay B0-> K*0(-> K-pi+)l^+l^- (l=e, \mu, \tau) in the low dilepton mass
region. We focus on the study of the angular distribution of this decay that
provides valuable information on the K* spin amplitudes A_perp, A_par, A0. This
can give us a handle on non-standard interactions that cannot be proved through
measurements of the branching ratio and lepton forward-backward asymmetry. We
explore the transverse asymmetries A_T^1(s), A_T^2(s), K* polarization
parameter \alpha_{K*}(s), the fraction of K* polarization F_L(s) and F_T(s) and
the corresponding integrated observables at NLL order, including factorizable
and non-factorizable corrections. We find, in particular, that the dependence
on hadronic uncertainties for the transverse asymmetries turns out to be very
small. This allow us to distinguish which observables are better suited to look
for physics beyond the SM. Finally, we study in a model independent way the
implications of New Physics for these observables.


title: Neutrinos in the simplest little Higgs scenario and TeV leptogenesis

abstract:
  The little Higgs scenario may provide an interesting framework to accommodate
TeV scale leptogenesis because a TeV Majorana mass of the right-handed neutrino
that we employ for the latter may find a natural place near the ultraviolet
cutoff of the former. In this work we study how a light neutrino spectrum,
generated radiatively, and TeV scale leptogenesis can be embedded in the
simplest little
  Higgs framework. Alternatively, we highlight how the neutrino Yukawa textures
of the latter are constrained.


title: Remarks on flavour mixings from orbifold compactification

abstract:
  We consider 5d SU(5) GUT models based on the orbifold $S^1/(Z_2 \times
Z_2')$, and study the different possibilities of placing the SU(5) matter
multiplets in three possible locations, namely, the two branes at the two
orbifold fixed points and SU(5) bulk. We demonstrate that if flavour
hierarchies originate solely from geometrical suppressions due to wavefunction
normalisation of fields propagating in the bulk, then it is not possible to
satisfy even the gross qualitative behaviour of the CKM and MNS matrices
regardless of where we place the matter multiplets.