title: Opening a new window for warm dark matter

abstract:
  We explore the range of parameters for dark-matter sterile neutrinos in an
extention of the Minimal Standard Model by three singlet fermions with masses
below the electroweak scale (the $\nu$MSM). This simple model can explain a
wide range of phenomena, including neutrino oscillations, baryogenesis, the
pulsar velocities, and the early reionization. The presence of two heavier
sterile neutrinos and the possibility of entropy production in their decays
broadens the allowed range of parameters for the dark-matter sterile neutrinos
(or other types of dark matter, for example, the gravitino). In addition, the
primordial production of dark matter sterile neutrinos allows to escape most of
the constraints.


title:
Static observables of relativistic three-fermion systems with
  instantaneous interactions

abstract:
  We show that static properties like the charge radius and the magnetic moment
of relativistic three-fermion bound states with instantaneous interactions can
be formulated as expectation values with respect to intrinsically defined
wavefunctions. The resulting operators can be given a natural physical
interpretation in accordance with relativistic covariance. We also indicate how
the formalism may be generalized to arbitrary moments. The method is applied to
the computation of static baryon properties with numerical results for the
nucleon charge radii and the baryon octet magnetic moments. In addition we make
predictions for the magnetic moments of some selected nucleon resonances and
discuss the decomposition of the nucleon magnetic moments in contributions of
spin and angular momentum, as well as the evolution of these contributions with
decreasing quark mass.


title: Semileptonic decays of baryons in a relativistic quark model

abstract:
  We calculate semileptonic decays of light and heavy baryons in a
relativistically covariant constituent quark model. The model is based on the
Bethe-Salpeter-equation in instantaneous approximation. It generates
satisfactory mass spectra for mesons and baryons up to the highest observable
energies. Without introducing additional free parameters we compute on this
basis helicity amplitudes of electronic and muonic semileptonic decays of
baryons. We thus obtain form factor ratios and decay rates in good agreement
with experiment.


title: Charmed baryons in a relativistic quark model

abstract:
  We calculate mass spectra of charmed baryons within a relativistically
covariant quark model based on the Bethe-Salpeter-equation in instantaneous
approximation. Interactions are given by a linearly rising three-body
confinement potential and a flavor dependent two-body force derived from QCD
instanton effects. This model has already been successfully applied to the
calculation of light flavor baryon spectra and is now extended to heavy
baryons. Within the same framework we compare the results to those obtained
with the more conventional one-gluon-exchange potential.


title: Disguising the Oblique Parameters

abstract:
  We point out a set of operator identities that relate the operators
corresponding to the oblique corrections to operators that modify fermion
couplings to the gauge bosons as well as operators that modify triple gauge
boson couplings. Such identities are simple consequences of the equations of
motion. Therefore the contributions from new physics to the oblique parameters
can be disguised as modifications of triple gauge boson couplings provided the
fermion couplings to the gauge bosons are suitably modified by higher
dimensional operators. Since the experimental constraints on triple gauge boson
couplings are much weaker than the constraints on the oblique parameters this
observation allows extra room for model building. We derive operator relations
in effective theories of the Standard Model with the electroweak symmetry
either linearly or nonlinearly realized and discuss applications of our
results.


title: Flavour physics of the RS model with KK masses reachable at LHC

abstract:
  The version of the higher-dimensional Randall-Sundrum (RS) model with matter
in the bulk, which addresses the gauge hierarchy problem, has additional
attractive features. In particular, it provides an intrinsic geometrical
mechanism that can explain the origin of the large mass hierarchies among the
Standard Model fermions. Within this context, a good solution for the gauge
hierarchy problem corresponds to low masses for the Kaluza-Klein (KK)
excitations of the gauge bosons. Some scenarios have been proposed in order to
render these low masses (down to a few TeV) consistent with precision
electroweak measurements. Here, we give specific and complete realizations of
this RS version with small KK masses, down to 1 TeV, which are consistent with
the entire structure of the fermions in flavour space: (1) all the last
experimental data on quark/lepton masses and mixing angles (including massive
neutrinos of Dirac type) are reproduced, (2) flavour changing neutral current
constraints are satisfied and (3) the effective suppression scales of
non-renormalizable interactions (in the physical basis) are within the bounds
set by low energy flavour phenomenology. Our result, on the possibility of
having KK gauge boson modes as light as a few TeV, constitutes one of the first
theoretical motivations for experimental searches of direct signatures at the
LHC collider, of this interesting version of the RS model which accommodates
fermion masses.


title:
Exclusive B-> M \nu \bar{\nu} (M= \pi, K, \rho, K^*) Decays and
  Leptophobic Z^\prime Model

abstract:
  We consider the exclusive flavor changing neutral current processes B -> M
\nu \bar{\nu} (M= \pi, K, \rho, K^*) in the leptophobic Z^\prime model, in
which the charged leptons do not couple to the extra Z^\prime boson. We find
that these exclusive modes are very effective to constrain the leptophobic
Z^\prime model. In the leptophobic Z^\prime model, additional right-handed
neutrinos are introduced and they can contribute to the missing energy signal
in B -> M + E_missing decays. Through the explicit calculations, we obtain
quite stringent bounds on the model parameters, |U_{sb}^{Z^\prime}| \leq 0.29
and |U_{db}^{Z^\prime}| \leq 0.61, from the already existing experimental data.
We also briefly discuss an interesting subject of massive right-handed
neutrinos, which might be connected with the dark matter problem.


title:
Cosmic Positron Signature from Dark Matter in the Littlest Higgs Model
  with T-parity

abstract:
  We calculate the flux of cosmic positrons from the dark matter annihilation
in the littlest Higgs model with T-parity. The dark matter annihilates mainly
into weak gauge bosons in the halo, and high energy positrons are produced
through leptonic and hadronic decays of the bosons. We investigate a
possibility to detect the positron signal in upcoming experiments such as
PAMELA and AMS-02. We found that the dark matter signal can be distinguished
from the background in the PAMELA experiment when the dark matter mass is less
than 120 GeV and the signal flux is enhanced due to a small scale clustering of
dark matter. Furthermore, the signal from the dark matter annihilation can be
detected in the AMS-02 experiment, even if such enhancement does not exist. We
also discuss the invisible width of the Higgs boson in this model.


title:
Fragmentation Function and Hadronic Production of the Heavy
  Supersymmetric Hadrons

abstract:
  The light top-squark $\sto$ may be the lightest squark and its lifetime may
be `long enough' in a kind of SUSY models which have not been ruled out yet
experimentally, so colorless `supersymmetric hadrons (superhadrons)' $(\sto
\bar{q})$ ($q$ is a quark except $t$-quark) may be formed as long as the light
top-squark $\sto$ can be produced. Fragmentation function of $\sto$ to heavy
`supersymmetric hadrons (superhadrons)' $(\sto \bar{Q})$ ($\bar{Q}=\bar{c}$ or
$\bar{b}$) and the hadronic production of the superhadrons are investigated
quantitatively. The fragmentation function is calculated precisely. Due to the
difference in spin of the SUSY component, the asymptotic behavior of the
fragmentation function is different from those of the existent ones. The
fragmentation function is also applied to compute the production of heavy
superhadrons at hadronic colliders Tevatron and LHC under the so-called
fragmentation approach. The resultant cross-section for the heavy superhadrons
is too small to observe at Tevatron, but great enough at LHC, even when all the
relevant parameters in the SUSY models are taken within the favored region for
the heavy superhadrons. The production of `light superhadrons' $(\sto \bar{q})$
($q=u, d, s$) is also roughly estimated. It is pointed out that the production
cross-sections of the light superhadrons $(\sto \bar{q})$ may be much greater
than those of the heavy superhadrons, so that even at Tevatron the light
superhadrons may be produced in great quantities.


title:
Quantum uncertainty in distance measurement: Holography and black hole
  thermodynamics

abstract:
  Exact conditions on the clock parameters corresponding to the minimal
uncertainty in distance measurement are derived in uniform manner for any
number of space time dimensions. The result espouses the holography principle
no matter what the number of space time dimensions is. In this context the ADD
braneworld model is considered. Some remarks are made on deviation of
holography as well as of special relativity at the scales provided by the
cosmological constant. We also comment on the potential influence of the
background radiation on the uncertainty in length measurement. The presence of
unavoidable quantum uncertainty in length measurement results in fluctuations
of the black hole thermodynamics that can be interested to address the
information loss problem. The quantum corrections to the black hole entropy
obtained in various scenarios are imperceptible because of these fluctuations.
At the Planck scale the fluctuations destroy the thermodynamic picture of the
black hole.


title: Phased Breaking of mu-tau symmetry and Leptogenesis

abstract:
  Non-vanishing U_{e3} has been theoretically related to a certain flavor
symmetry breaking in the neutrino sector. We propose a scenario to break the
mu-tau symmetry so as to accommodate the non-vanishing U_{e3}. Our scenario is
constructed in the context of a seesaw model, and the mu-tau symmetry breaking
is achieved by introducing a CP phase in the Dirac Yukawa matrix. We also show
how the deviation of theta_{23} from the maximal mixing and non-vanishing
U_{e3} depend on the CP phase. Neutrino mixings and the neutrino mass-squared
differences are discussed, and the amplitude in neutrinoless double beta decay
m_{ee} are also predicted. We found that a tiny breaking of the mu-tau symmetry
due to mass splitting between two degenerate heavy Majorana neutrinos on top of
the Dirac CP phase can lead to successful leptogenesis. We examine how
leptogenesis can be related with low energy neutrino measurement, and show that
our predictions for U_{e3} and m_{ee} can be constrained by the current
observation of baryon asymmetry.


title: Time evolution of relativistic d + Au and Au + Au collisions

abstract:
  The evolution of charged-particle production in collisions of heavy ions at
relativistic energies is investigated as function of centrality in a
nonequilibrium-statistical framework. Precise agreement with recent d + Au and
Au + Au data at sqrt(s_NN) = 200 GeV is found in a Relativistic Diffusion Model
with three sources for particle production. Only the midrapidity source comes
very close to local equilibrium, whereas the analyses of the overall
pseudorapidity distributions show that the systems remain far from statistical
equilibrium.


title: tau Decays to Five Mesons in TAUOLA

abstract:
  The tau-decay library TAUOLA has gained popularity over the last decade.
However, with the continuously increasing precision of the data, some of its
functionality has become insufficient. One of the requirements is the
implementation of decays into five mesons plus a neutrino with a realistic
decay amplitude. This note describes a step into this direction. For the 2pi-
pi+ 2pi0 mode the three decay chains tau- --> a_1- nu --> rho- (--> pi- pi0)
omega (--> pi- pi+ pi0) nu, tau- --> a_1- nu --> a_1- (--> 2pi- pi+) f_0 (-->
2pi0) nu, and tau- --> a_1- nu --> a_1- (--> pi- 2pi0) f_0 (--> pi + pi-) nu
are introduced with simple assumptions about the couplings and propagators of
the various resonances. Similar amplitudes (without the rho omega
contributions) are adopted for the pi- 4pi0 and 3pi- 2pi+ modes.
  The five-pion amplitude is thus based on a simple model, which, however, can
be considered as a first realistic example. Phase-space generation includes the
possibility of presampling the omega and a_1 resonances, in one channel only,
however. This is probably sufficient for the time being, both for physics
applications and for tests.
  The technical test of the new part of the generator is performed by comparing
Monte Carlo and analytical results. To this end a non-realistic, but easy to
calculate, purely scalar amplitude for the decay into five massless pions was
used.


title: Hunting Medium Modifications of the Chiral Condensate

abstract:
  With QCD sum rule evaluations, spectral changes of hadrons inside nuclear
matter are considered, which shed light on QCD condensates and thus on the
non-perturbative structure of the QCD ground state. For some light quark
configurations, omega meson and nucleon, the relevance of four-quark
condensates is compared; the D meson as a representative of heavy-light quark
systems is also briefly discussed.


title: Real and Virtual Nucleon Compton Scattering in the Perturbative Limit

abstract:
  We present the results of calculations analyzing nucleon Compton scattering
to lowest order using perturbative QCD (pQCD) methods. Two scenarios are
considered: (1) the incoming photon is real; and (2) the incoming photon is
virtual. The case of a real photon has been previously analyzed at least 5
times using pQCD, but no two results are in agreement. Here it is shown that
our result agrees with that of Brooks and Dixon published in 2000. The case of
a virtual photon has been previously analyzed only once using pQCD. However,
doubt has been cast on the validity of that result. The results presented here
for virtual photon are believed to be more reliable. Some consideration is
given of how to compare these results with experiment. Following the lead of
Brooks and Dixon, for the proton, this involves normalizing the cross section
using the Dirac proton form factor, which we also calculate. Finally, there is
a comparison of our results with recent experiments.


title:
Functional Integral Approaches to the Bosonization of Effective
  Multi-Quark Interactions with $U_\A(1)$ Breaking

abstract:
  Low energy hadron phenomenology involving the (u,d,s) quarks is often
approached through effective multi-quark Lagrangians with the symmetries of
QCD. A very successful approach consists in taking the four-quark
Nambu--Jona-Lasinio Lagrangian with the chiral $U_L(3)\times U_R(3)$ symmetry
in the massless limit, combined with the $U_\A(1)$ breaking six-quark flavour
determinant interaction of 't Hooft. We review the present status and some very
recent developments related to the functional integration over the cubic term
in auxiliary mesonic variables that one introduces to bosonize the system.
Various approaches for handling this functional, which cannot be integrated
exactly, are discussed: the stationary phase approximation, the perturbative
expansion, the loop expansion, their interrelation and importance for the
evaluation of the effective action. The intricate group structure rules out the
method of Airy's integral. The problem of the instability of the vacuum is
stated and a solution given by including eight-quark interactions.


title: Fermion masses and mixings in SO(10) GUTs

abstract:
  I will present a simple, economic and predictive model of Yukawa structures
in the context of a renormalizable SO(10) grandunification. The righthanded
neutrino mass is generated radiatively. The fermions have Yukawa couplings with
one 10 and one 120 dimensional Higgses. In the approxiamate two generation
scenario the model predicts degenerate neutrinos, small quark mixing and b-tau
Yukawa unification.


title:
Pionic Decays of $D_{sj}(2317)$, $D_{sj}(2460)$ and $B_{sj}(5718)$,
  $B_{sj}(5765)$

abstract:
  We estimate pionic decay widths of the narrow charm-strange resonances
$D_{sj}(2317)$ and $D_{sj}(2460)$ using the $^3P_0$ model. Their one-pion
decays occur through $\eta$-$\pi^0$ mixing while the two-pion decays of
$D_{sj}(2460)$ occur through the virtual $f_0(980)$ meson. The mixing between
$^3P_1$ and $^1P_1$ states enhances the single pion decay width of
$D_{sj}(2460)$ and suppresses its double pion decay width significantly. The
two-pion decay width of $D_{sj}(2460)$ is much smaller than its one-pion decay
width. As a byproduct, we also calculate pionic decay widths of $B_{sj}(5765)$,
$B_{sj}(5765)$ mesons in the $(0^+, 1^+)$ heavy doublet.


title: Gauge Coupling Unification, SUSY Scale and Strong Coupling Running

abstract:
  The apparent unification of gauge couplings around 10^16 GeV is one of the
strong arguments in favor of Supersymmetric extensions of the Standard Model
(SM). In this contribution two new analyses of the gauge coupling running, the
latter using in contrast to previous studies not data at the Z peak but at LEP2
energies, are presented. The generic SUSY scale in the more precise novel
approach is 93 < M_SUSY < 183 GeV, easily within LHC, and possibly even within
Tevatron reach.


title: Constraints on Light Dark Matter From Core-Collapse Supernovae

abstract:
  We show that light ($\simeq$ 1 -- 30 MeV) dark matter particles can play a
significant role in core-collapse supernovae, if they have relatively large
annihilation and scattering cross sections, as compared to neutrinos. We find
that if such particles are lighter than $\simeq$ 10 MeV and reproduce the
observed dark matter relic density, supernovae would cool on a much longer time
scale and would emit neutrinos with significantly smaller energies than in the
standard scenario, in disagreement with observations. This constraint may be
avoided, however, in certain situations for which the neutrino--dark matter
scattering cross sections remain comparatively small.


title:
The effect of the Gaussian profile of the new Higgs doublet on the
  radiative lepton flavor violating decay

abstract:
  We study the branching ratios of the lepton flavor violating processes \mu ->
e\gamma, \tau -> e\gamma and \tau -> \mu\gamma by considering that the new
Higgs scalars localize with Gaussian profile in the extra dimension. We see
that the BRs of the LFV decays \mu -> e \gamma, \tau -> e \gamma and \tau ->
\mu\gamma are at the order of the magnitude of 10^{-12}, 10^{-16} and 10^{-12}
in the considered range of the free parameters. These numerical values are
slightly suppressed in the case that the localization points of new Higgs
scalars are different than origin.


title:
Radiative Decays of Decuplet Baryons, $\Lambda(1405)$ and $\Lambda
  (1520)$ Hyperons

abstract:
  The chiral quark model gives a reasonably good description of many low-energy
observables by incorporating the effective degrees carried by the constituent
quarks and Goldstone bosons. We calculate the decuplet to octet transition
magnetic moments and the decay widths of several excited hyperons using this
model. The various radiative decay widths from the chiral quark roughly agree
with experimental data including the recent JLAB measurement.


title: The BES f_0(1810): a new glueball candidate

abstract:
  We analyze the f_0(1810) state recently observed by the BES collaboration via
radiative J/\psi decay to a resonant \phi\omega spectrum and confront it with
DM2 data and glueball theory. The DM2 group only measured \omega\omega decays
and reported a pseudoscalar but no scalar resonance in this mass region. A
rescattering mechanism from the open flavored KKbar decay channel is considered
to explain why the resonance is only seen in the flavor asymmetric \omega\phi
branch along with a discussion of positive C parity charmonia decays to
strengthen the case for preferred open flavor glueball decays. We also
calculate the total glueball decay width to be roughly 100 MeV, in agreement
with the narrow, newly found f_0, and smaller than the expected estimate of
200-400 MeV. We conclude that this discovered scalar hadron is a solid glueball
candidate and deserves further experimental investigation, especially in the
K-Kbar channel. Finally we comment on other, but less likely, possible
assignments for this state.


title: Parton Distributions, Logarithmic Expansions and Kinetic Evolution

abstract:
  Aspects of the QCD parton densities are briefly reviewed, drawing some
parallels to the density matrix formulation of quantum mechanics, exemplified
by Wigner functions. We elaborate on the solution of their evolution equations
using logarithmic expansions and overview their kinetic interpretation. We
illustrate how a Fokker-Planck equation can be derived using the master
formulation of the same equations and its construction in the case of the
transverse spin distributions. A simple connection of the leading order DGLAP
equation to fractional diffusion using fractional calculus is also briefly
outlined.


title: Neutrino-antineutrino pair production by a photon in a dense matter

abstract:
  The possibility of radiative effects that are due to interaction of fermions
with a dense matter is investigated. Neutrino-antineutrino photo-production is
studied. The rate of this process is calculated in the Furry picture. It is
demonstrated that this effect does not disappear even if the medium refractive
index is assumed to be equal to unity. The rate obtained strongly depends on
the polarization states of the particles involved. This leads to evident
spatial asymmetries, which may have certain consequences observable in
astrophysical and cosmological studies.


title: Single Top-Quark Production in Flavor-Changing Z' Models

abstract:
  In some models with an extra U(1) gauge boson Z', the gauge couplings of the
Z' to different generations of fermions may not be universal. Flavor mixing in
general can be induced at the tree level in the up-type and/or down-type quark
sector after diagonalizing their mass matrices. In this work, we concentrate on
the flavor mixing in the up-type quark sector. We deduce a constraint from
D0-D0bar mixing. We study in detail single top-quark production via
flavor-changing Z' exchange at the LHC and the ILC. We found that for a typical
value of M_{Z'}=1 TeV, the production cross section at the LHC can be of the
order of 1 fb. However, the background from the Standard Model single top-quark
production makes it difficult to detect the flavor-changing Z' signal unless
with a decent charm tagging method. On the other hand, at the ILC, the
production cross section at the resonance energy of \sqrt{s} \approx M_{Z'} can
reach a size of more than 100 fb. Even away from the resonance, the cross
section at ILC is shown to be larger than the threshold of observability of
0.01 fb.


title: Anomalous Action of QCD from the General Quark Propagator

abstract:
  The anomalous action of the chiral effective theory to $\mathcal{O}(p^4)$ is
investigated by generalizing the consideration in \cite{ma02} with including
the wave function part in the general quark propagator. It is found that the
QCD dynamics dependence of the Wess-Zumino term is explicit and this dependence
means that the QCD chiral symmetry must be broken dynamically in the low energy
region for dynamically generating the Wess-Zumino term. In addition, we found
that the next to leading order anomalous action in the momentum expansion of
the chiral perturbation theory is gauge invariant and QCD dynamics dependent.


title: Holographic Estimate of Oblique Corrections for Technicolor

abstract:
  We study the oblique corrections to the electroweak interaction in the
holographic model of technicolor theories. The oblique S parameter is expressed
in terms of a solution to the equations of motion for the AdS bulk gauge
fields. By analyzing the solution, we establish a rigorous proof that the S
parameter is positive and is reduced by walking. We also present the precise
numerical values for the S parameter of various technicolor models by solving
the equations numerically.


title: The Cut-Constructible Part of QCD Amplitudes

abstract:
  Unitarity cuts are widely used in analytic computation of loop amplitudes in
gauge theories such as QCD. We expand upon the technique introduced in
hep-ph/0503132 to carry out any finite unitarity cut integral. This technique
naturally separates the contributions of bubble, triangle and box integrals in
one-loop amplitudes and is not constrained to any particular helicity
configurations. Loop momentum integration is reduced to a sequence of algebraic
operations. We discuss the extraction of the residues at higher-order poles.
Additionally, we offer concise algebraic formulas for expressing coefficients
of three-mass triangle integrals. As an application, we compute all remaining
coefficients of bubble and triangle integrals for nonsupersymmetric six-gluon
amplitudes.


title: Charmonium Production at High Energy in the k_T-Factorization Approach

abstract:
  We study charmonium production at high-energy colliders (Tevatron, HERA, and
LEP2) in the framework of the k_T-factorization approach and the factorization
formalism of non-relativistic quantum chromodynamics at leading order in the
strong-coupling constant alpha_s and the relative velocity v. The
transverse-momentum distributions of direct and prompt J/psi-meson production
measured at the Fermilab Tevatron are fitted to obtain the non-perturbative
long-distance matrix elements for different choices of unintegrated gluon
distribution functions in the proton. Using the matrix elements thus obtained,
we predict charmonium production rates in gamma-gamma, gamma-p, and
deep-inelastic e-p collisions including the contributions from both direct and
resolved photons. The results are compared with the known ones obtained in the
conventional parton model and with recent experimental data from HERA and LEP2.


title:
Chromomagnetic stability of the three flavor
  Larkin-Ovchinnikov-Fulde-Ferrell phase of QCD

abstract:
  We compute in the Ginzburg-Landau approximation the gluon Meissner masses for
the Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) phase of QCD with three flavors in
the kinematical range where it is energetically favored. We find real Meissner
masses and therefore chromomagnetic stability.


title:
$\gamma p$ and $\gamma \gamma$ scattering from $\bar{p}p$, $pp$ forward
  amplitudes in a QCD eikonal model with a dynamical gluon mass

abstract:
  We examine the $\gamma p$ photoproduction and the hadronic $\gamma \gamma$
total cross sections by means of a QCD eikonal model with a dynamical infrared
mass scale. In this model, where the dynamical gluon mass is the natural
regulator for the tree level gluon-gluon scattering, the $\gamma p$ and $\gamma
\gamma$ total cross sections are derived from the $pp$ and $\bar{p}p$ forward
scattering amplitudes assuming vector meson dominance and the additive quark
model. We show that the validity of the cross section factorization relation
$\sigma_{pp}/\sigma_{\gamma p}=\sigma_{\gamma p}/\sigma_{\gamma \gamma}$ is
fulfilled depending on the Monte Carlo model used to unfold the hadronic
$\gamma \gamma$ cross section data, and we discuss in detail the case of
$\sigma (\gamma \gamma \to hadrons)$ data with $W_{\gamma \gamma} > 10$ GeV
unfolded by the Monte Carlo generators PYTHIA and PHOJET. The data seems to
favor a mild dependence with the energy of the probability ($P_{had}$) that the
photon interacts as a hadron.


title:
On the role of NLL corrections and Energy Conservation in the High
  Energy Evolution of QCD

abstract:
  We present a new method for solving the BFKL evolution applicable at both
leading and next-to-leading logarithmic accuracy, and tailored to the study of
QCD multi-jet events at colliders. We utilise this to discuss corrections to
the standard analysis. There are known, large corrections from energy and
momentum conservation. We show that, despite claims to the contrary in the
literature, these are unrelated to the next-to-leading logarithmic corrections
to the evolution kernel.


title: Hydrodynamic Flow from Fast Particles

abstract:
  We study the interaction of a fast moving particle in the Quark Gluon Plasma
with linearized hydrodynamics. We derive the linearized hydrodynamic equations
on top of an expanding fireball, and detail the solutions for a static medium.
There are two modes far from the jet -- a sound mode and a diffusion mode. The
diffusion mode is localized in a narrow wake behind the jet while the sound
mode propagates at the Mach angle, $\cos(\theta_M) = c_s/c$. A general argument
shows that the strength of the diffusion mode relative to the sound mode is
directly proportional to the entropy produced by the jet-medium interaction.
This argument does not rely on the linearized approximation and the assumption
of local thermal equilibrium close to the jet. With this insight we calculate
the spectrum of secondaries associated with the fast moving particle. If the
energy loss is large and the jet-medium interaction does not produce
significant entropy, the flow at the Mach angle can be observed in the
associated spectrum. However, the shape of associated spectra is quite fragile
and sensitive to many of the inputs of the calculation.


title:
High energy Gamma-Ray Bursts as a result of the collapse and total
  annihilation of neutralino clumps

abstract:
  Rare astrophysical events - cosmological gamma-ray bursts with energies over
GeV - are considered as an origin of information about some SUSY parameters.
The model of generation of the powerful gamma-ray bursts is proposed. According
to this model the gamma-ray burst represents as a result of the collapse and
the total annihilation of the neutralino clump. About 80 % of the clump mass
radiates during about 100 second at the final stage of annihilation. The
annihilation spectrum and its characteristic energies are calculated in the
framework of Split Higgsino model.


title: The one-loop amplitude for six-gluon scattering

abstract:
  We present results for the six-gluon scattering amplitude at one-loop. Since
our method is semi-numerical, it yields the result for arbitrary momenta and
helicities of the external gluons. We evaluate the colour-ordered
sub-amplitudes with gluons, fermions and scalars running in the internal loop.
This is more than sufficient to give a complete description of six-gluon
scattering at one-loop in QCD. Combination of these results into amplitudes
with ${\cal{N}}=4$ and ${\cal{N}}=1$ multiplets of supersymmetric Yang-Mills or
with a complex scalar in the internal loops allows comparison with analytic
results in the literature. The numerical results for most of the helicity
combinations with loops of complex scalars are new.


title:
Chiral Phase Structure at Finite Temperature and Density in Einstein
  Universe

abstract:
  The gravitational effect on the chiral phase structure at finite temperature
and density is investigated in the framework of Nambu--Jona-Lasinio model in
$D$-dimensional ultrastatic Einstein universe. In mean field approximation, the
thermodynamic potential and the gap equation determining the curvature,
temperature and density dependence of the chiral condensate are analytically
derived. In the sense of chiral symmetry restoration and the order of the phase
transition, the scalar curvature of the space-time plays similar role as the
temperature.


title: Determination of Dark Matter Properties at High-Energy Colliders

abstract:
  If the cosmic dark matter consists of weakly-interacting massive particles,
these particles should be produced in reactions at the next generation of
high-energy accelerators. Measurements at these accelerators can then be used
to determine the microscopic properties of the dark matter. From this, we can
predict the cosmic density, the annihilation cross sections, and the cross
sections relevant to direct detection. In this paper, we present studies in
supersymmetry models with neutralino dark matter that give quantitative
estimates of the accuracy that can be expected. We show that these are well
matched to the requirements of anticipated astrophysical observations of dark
matter. The capabilities of the proposed International Linear Collider (ILC)
are expected to play a particularly important role in this study.


title:
Resummation for Polarized Semi-Inclusive Deep-Inelastic Scattering at
  Small Transverse Momentum

abstract:
  We study the transverse-momentum distribution of hadrons produced in
semi-inclusive deep-inelastic scattering (SIDIS). We consider cross sections
for various combinations of polarizations of the initial lepton and nucleon or
the produced hadron, for which we perform the resummation of large
double-logarithmic perturbative corrections arising at small transverse
momentum. We present phenomenological results for the processes $lp\to l\pi X$
with longitudinally polarized leptons and protons. We discuss the impact of the
perturbative resummation and of estimated non-perturbative contributions on the
corresponding cross sections and their spin asymmetry. Our results should be
relevant for ongoing studies in the COMPASS experiment at CERN, and for future
experiments at the proposed eRHIC collider at BNL.


title: Some Features of the Glasma

abstract:
  We discuss high energy hadronic collisions within the theory of the Color
Glass Condensate. We point out that the initial electric and magnetic fields
produced in such collisions are longitudinal. This leads to a novel string like
description of the collisions, and a large Chern-Simons charge density made
immediately after the collision. The presence of the longitudinal magnetic
field suggests that essential to the description of these collisions is the
decay of Chern-Simons charge.


title: A short note on $q\bar qg$ hybrid assignment for $X(1812)\to \omega\phi$

abstract:
  BES Collaboration has recently observed an enhancement near the $\omega\phi$
threshold in the double OZI suppressed decay $J/\psi \to\gamma\omega\phi$. This
$\omega\phi$ enhancement is probably due to a new $J^{PC}=0^{++}$ X(1812)
state. We discuss a possible assignment that the X(1812) is a $
1/\sqrt{2}(u\bar u+d\bar d)g$ (or $s\bar sg$) hybrid meson. We suggest further
measurements to test these assignments.


title: B-hadron production in top quark decay

abstract:
  We present the energy distribution of b-flavoured hadrons in top quark decay
using the PYTHIA and HERWIG event generators, which we tune to LEP and SLD
data. We find that fitting the string and cluster models is essential to
reproduce the e+e- data and to reliably predict B-hadron production in top
decay. We also compare the PYTHIA and HERWIG results with the ones yielded by
resummed calculations based on the fragmentation function formalism.


title: Minimal Supergravity, Inflation, and All That

abstract:
  We consider an inflationary model in the hidden-sector broken supergravity
with an effectively large cutoff. The inflaton decay into right-handed
neutrinos naturally causes the observed baryon asymmetry of the universe with a
reheating temperature low enough to avoid the gravitino overproduction. We
emphasize that all the phenomenological requirements from cosmology and
particle physics are satisfied in the large-cutoff theory.


title: Magnetic moments of heavy baryons in the relativistic three-quark model

abstract:
  The magnetic moments of ground state single, double and triple heavy baryons
containing charm or bottom quarks are calculated in a relativistic three-quark
model, which, in the heavy quark limit, is consistent with Heavy Quark
Effective Theory and Heavy Hadron Chiral Perturbation Theory. The internal
quark structure of baryons is modeled by baryonic three-quark currents with a
spin-flavor structure patterned according to standard covariant baryonic wave
functions and currents used in QCD sum rule calculations.


title: The operator product expansion does not imply parity doubling of hadrons

abstract:
  We examine whether the fact that QCD is chirally invariant at short distances
necessarily leads to the prediction that hadrons form approximate parity
doublets, as has been recently put forward by Glozman and collaborators. We
show that this is not the case, and we exhibit some of the pitfalls of trying
to link the operator product expansion to the hadron spectrum. We illustrate
our arguments within a model for scalar and pseudo-scalar mesons used recently
by Shifman to argue for parity doubling. We find that, whatever the
experimental situation may be, there is no theoretical basis for parity
doubling based on the use of the operator product expansion.


title:
Exclusive meson pair production in gamma* gamma scattering at small
  momentum transfer

abstract:
  We study the exclusive production of pi pi and rho pi in hard gamma* gamma
scattering in the forward kinematical region where the virtuality of one photon
provides us with a hard scale in the process. The newly introduced concept of
Transition Distribution Amplitudes (TDA) is used to perform a QCD calculation
of these reactions thanks to two simple models for TDAs. Cross sections for rho
pi and pi pi production are evaluated and compared to the possible background
from the Bremsstrahlung process. This picture may be tested at intense
electron-positron colliders such as CLEO and B factories. The cross section e
gamma -> e' pi0 pi0 is finally shown to provide a possible determination of the
pi0 axial form factor, FA, at small t, which seems not to be measurable
elsewhere.


title:
Elliptic Flow and Fixed p_T Suppression in a Final State Interaction
  Model

abstract:
  It has been shown that a final state interaction model, used to describe
J/psi suppression, can also describe the fixed p_T suppression of the pi^0 (and
charged pions) yield at all values of p_T, with a final state interaction
cross-section sigma close to one milibarn. We propose an extension of the model
to the pion motion in the transverse plane - which introduces a dependence of
the suppression on the azimuthal angle theta_R. Using the same value of sigma,
we obtain values of the elliptic flow v_2 close to the experimental ones, for
all values of p_T, including the soft p_T region.


title:
Comparisons of Exact Results for the Virtual Photon Contribution to
  Single Hard Bremsstrahlung in Radiative Return for Electron-Positron
  Annihilation

abstract:
  We compare fully differential exact results for the virtual photon correction
to single hard photon bremsstrahlung obtained using independent calculations,
both for electron-positron annihilation at high-energy colliders and for
radiative return applications. The results are compared using Monte Carlo
evaluations of the matrix elements as well as by direct analytical evaluation
of certain critical limits. Special attention is given to the issues of
numerical stability and the treatment of finite-mass corrections. It is found
that agreement on the order of 10^{-5} or better is obtained over most of the
range of hard photon energies, at CMS energies relevant to both high energy
collisions and radiative return experiments.


title:
Les Houches "Physics at TeV Colliders 2005'' Beyond the Standard Model
  working group: summary report

abstract:
  The work contained herein constitutes a report of the "Beyond the Standard
Model'' working group for the Workshop "Physics at TeV Colliders", Les Houches,
France, 2-20 May, 2005. We present reviews of current topics as well as
original research carried out for the workshop. Supersymmetric and
non-supersymmetric models are studied, as well as computational tools designed
in order to facilitate their phenomenology.


title: The Form Factors of the Gauge-Invariant Three-Gluon Vertex

abstract:
  The gauge-invariant three-gluon vertex obtained from the pinch technique is
characterized by thirteen nonzero form factors, which are given in complete
generality for unbroken gauge theory at one loop. The results are given in $d$
dimensions using both dimensional regularization and dimensional reduction,
including the effects of massless gluons and arbitrary representations of
massive gauge bosons, fermions, and scalars. We find interesting relations
between the functional forms of the contributions from gauge bosons, fermions,
and scalars. These relations hold only for the gauge-invariant pinch technique
vertex and are d-dimensional incarnations of supersymmetric nonrenormalization
theorems which include finite terms. The form factors are shown to simplify for
$N=1,2$, and 4 supersymmetry in various dimensions. In four-dimensional
non-supersymmetric theories, eight of the form factors have the same functional
form for massless gluons, quarks, and scalars, when written in a physically
motivated tensor basis. For QCD, these include the tree-level tensor structure
which has prefactor $\beta_0=(11N_c-2N_f)/3$, another tensor with prefactor
$4N_c-N_f$, and six tensors with $N_c-N_f$. In perturbative calculations our
results lead naturally to an effective coupling for the three-gluon vertex
which depends on three momenta and gives rise to an effective scale which
governs the behavior of the vertex. The effects of nonzero internal masses are
important and have a complicated threshold and pseudo-threshold structure. The
results of this paper are an important part of a gauge-invariant dressed
skeleton expansion and a related multi-scale analytic renormalization scheme.
In this approach the scale ambiguity problem is resolved since physical
kinematic invariants determine the arguments of the couplings.


title:
Leading Chiral Corrections to the Nucleon Generalized Parton
  Distributions

abstract:
  Using heavy baryon chiral perturbation theory we study the leading chiral
corrections to the complete set of nucleon generalized parton distributions
(GPDs). We compute the leading quark mass and momentum transfer dependence of
the moments of nucleon GPDs through the nucleon off-forward twist-2 matrix
elements. These results are then applied to get insight on the GPDs and their
impact parameter space distributions.


title:
Bounds on neutrino masses from baryogenesis in thermal and non-thermal
  scenarios

abstract:
  Baryogenesis via leptogenesis is an attractive scenario that links the
physics of right handed neutrino sector with the low energy neutrino data. In
the light of current neutrino oscillation data we studied the bound on the mass
scale ($M_1$) of lightest right handed neutrino ($N_1$) as well as their mass
hierarchy ($M_2/M_1$ and $M_3/M_1$) from the leptogenesis constraint which we
discussed in two different parts of the thesis. In part-I, we studied the
canonical leptogenesis in a {\it thermal} scenario and hence the bound on
$M_1$. It is shown that the mass scale of $N_1$ must satisfy the constraint
$M_1\geq 10^8$ GeV in order to produce the adequate lepton asymmetry. We then
led to propose a model where this bound can be relaxed to TeV scale. In
part-II, we studied the formation and evolution of topological defects which
are non-thermal objects and are expected to be formed during the early Universe
phase transitions. In particular, we considered $B-L$ cosmic strings and their
effect on leptogenesis and hence the bound on the mass scale of $N_1$. It is
shown that for the $B-L$ symmetry breaking scale $\eta_{B-L}>10^{11}$GeV, in
certain parameter space, the cosmic strings make a more dominant contribution
than thermal leptogenesis.


title:
Colour entangled orphan quarks and dark energy from cosmic QCD phase
  transition

abstract:
  The present day astrophysical observations indicate that the universe is
composed of a large amount of dark energy (DE) responsible for an accelerated
expansion of the universe, along with a sizeable amount of cold dark matter
(CDM), responsible for structure formation. The explanations for the origin or
the nature of both CDM and DE seem to require ideas beyond the standard model
of elementary particle interactions. Here we show that CDM and DE both can
arise from the standard principles of strong interaction physics and quantum
entanglement.


title: Meson Strings and Flavor Branes

abstract:
  In a QCD-like string model based on D6 flavor branes in the presence of D4
color branes wrapping one of the compactified dimension on an $S^1$, the shape
of meson strings in the five dimensional curved space as well as the potential
between quark and anti-quark are investigated. The flavor branes on which both
ends of a meson string live are assumed to be separated in this five
dimensional space, depending on the values of the constituent quark masses. It
is shown in this picture that the meson string with different flavors on both
ends changes its shape at a critical distance. There is, however, no critical
distance for the meson with the same flavors. At this critical distance the
potential between quark and anti-quark with different flavors gives a point of
reflection and changes its shape around this point. Accordingly, the attractive
force between quark and anti-quark seems to become stronger when the distance
of flavor branes connecting meson strings becomes larger. This indicates quark
systems with different flavors can form high-density states.


title:
A comparison of efficient methods for the computation of Born gluon
  amplitudes

abstract:
  We compare four different methods for the numerical computation of the pure
gluonic amplitudes in the Born approximation. We are in particular interested
in the efficiency of the various methods as the number n of the external
particles increases. In addition we investigate the numerical accuracy in
critical phase space regions. The methods considered are based on (i)
Berends-Giele recurrence relations, (ii) scalar diagrams, (iii) MHV vertices
and (iv) BCF recursion relations.


title: e+e- --> e+e- pi0 pi0 at Daphne

abstract:
  The production of the sigma(500) meson in gamma gamma --> pi0 pi0 is studied.
In particular, the KLOE data collected during the DAPHNE run at sqrt(s)= 1 GeV
are appropriate to this purpose because of the strong reduction of Kaon
backgrounds.


title: Dark Matter in the Simplest Little Higgs Model

abstract:
  We investigate a variation of the Simplest Little Higgs (SLH) model that is
invariant under a discrete $\CZ_2$ symmetry. Our motivation for imposing this
symmetry is the two dark matter candidates it implies, a scalar $\eta$ and a
heavy neutrino. We examine the viability of these two candidates using the
standard relic abundance calculation. Direct detection prospects are also
discussed.


title:
Hunting the CKM weak phase with time-integrated Dalitz analyses of Bs ->
  K pi pi decays

abstract:
  We present a new technique to extract information on the Unitarity Triangle
from the study of Bs -> K pi pi Dalitz plot. Using isospin symmetry and the
possibility to access the decay amplitudes from Dalitz analyses, we propose a
new strategy to extract the weak phase gamma from Bs to K pi pi.


title: Comment on "A QCD sum rule study of the light scalar mesons"

abstract:
  This paper has been withdrawn by the authors. We have discovered an error in
the evaluation of the diagram, which invalidates our conclusion.


title:
Dynamical mass generation in strongly coupled Quantum Electrodynamics
  with weak magnetic fields

abstract:
  We study the dynamical generation of masses for fundamental fermions in
quenched quantum electrodynamics in the presence of weak magnetic fields using
Schwinger-Dyson equations. Contrary to the case where the magnetic field is
strong, in the weak field limit the coupling should exceed certain critical
value in order for the generation of masses to take place, just as in the case
where no magnetic field is present. The weak field limit is defined as eB <<
m(0)^2, where m(0) is the value of the dynamically generated mass in the
absence of the field. We carry out a numerical analysis to study the magnetic
field dependence of the mass function above critical coupling and show that in
this regime the dynamically generated mass and the chiral condensate for the
lowest Landau level increase proportionally to (eB)^2.


title: Resonance production by neutrinos: The second resonance region

abstract:
  The article contains new results for spin-3/2 and -1/2 resonances. It
specializes to the second resonance region, which includes the $P_{11}(1440)$,
$D_{13}(1520)$ and $S_{11}(1535)$ resonances. New data on electroproduction
enable us to determine the vector form factors accurately. Estimates for the
axial couplings are obtained from decay rates of the resonances with the help
of the partially conserved axial current (PCAC) hypothesis. We present cross
sections to be compared with the running and future experiments. The article is
self--contained and allows the reader to write simple programs for reproducing
the cross sections and for obtaining additional differential cross sections.


title: Higgs Boson Production and Decay in Little Higgs Models with T-parity

abstract:
  We study Higgs boson production and decay in a certain class of Little Higgs
models with T-parity in which some T-parity partners of the Standard Model (SM)
fermions gain their masses through Yukawa-type couplings. We find that the
Higgs boson production cross section of a 120 GeV Higgs boson at the CERN LHC
via gg fusion process at one-loop level could be reduced by about 45%, 35% and
20%, as compared to its SM prediction, for a relatively low new particle mass
scale f = 600, 700 and 1000 GeV, respectively. On the other hand, the weak
boson fusion cross section is close to the SM value. Furthermore, the Higgs
boson decay branching ratio into di-photon mode can be enhanced by about 35% in
small Higgs mass region in certain case, for the total decay width of Higgs
boson in the Little Higgs model is always smaller than that in the SM.


title: Charmonium in Medium and at RHIC

abstract:
  The production of charmonia in relativistic heavy-ion collisions is
formulated within the framework of a quantum kinetic theory simultaneously
accounting for breakup and recombination processes. The survival probability of
J/Psi mesons is evaluated for a Mott-Hagedorn resonance gas, whereby the
pattern of anomalous J/Psi suppression at CERN-SPS can be explained by a strong
coupling to open-charm states and their in-medium modification. Recent data for
charmonium suppression from Au-Au collisions at RHIC are discussed.


title: GR@PPA 2.7 event generator for $pp$/$p\bar{p}$ collisions

abstract:
  The GR@PPA event generator has been updated to version 2.7. This distribution
provides event generators for $V$ ($W$ or $Z$) + jets ($\leq$ 4 jets), $VV$ +
jets ($\leq$ 2 jets) and QCD multi-jet ($\leq$ 4 jets) production processes at
$pp$ and $p\bar{p}$ collisions, in addition to the four bottom quark
productions implemented in our previous work (GR@PPA\_4b). Also included are
the top-pair and top-pair + jet production processes, where the correlation
between the decay products are fully reproduced at the tree level. Namely,
processes up to seven-body productions can be simulated, based on ordinary
Feynman diagram calculations at the tree level. In this version, the GR@PPA
framework and the process dependent matrix-element routines are separately
provided. This makes it easier to add further new processes, and allows users
to make a choice of processes to implement. This version also has several new
features to handle complicated multi-body production processes. A systematic
way to combine many subprocesses to a single base-subprocess has been
introduced, and a new method has been adopted to calculate the color factors of
complicated QCD processes. They speed up the calculation significantly.


title: Implication of the B -> rho rho data on the B -> pi pi puzzle

abstract:
  We point out that the B -> rho rho data have seriously constrained the
possibility of resolving the B -> pi pi puzzle from the large observed B^0 ->
pi^0 pi^0 branching ratio in the available theoretical approaches. The
next-to-leading-order (NLO) contributions from the vertex corrections, the
quark loops, and the magnetic penguin evaluated in the perturbative QCD (PQCD)
approach have saturated the experimental upper bound of the B^0 -> rho^0 rho^0
branching ratio, and do not help. The NLO PQCD predictions for the B^0 ->
rho^\mp rho^\pm and B^\pm -> rho^\pm rho^0 branching ratios are consistent with
the data. The inclusion of the NLO jet function from the soft-collinear
effective theory into the QCD-improved factorization approach, though enhancing
the B^0 -> pi^0 pi^0 branching ratio sufficiently, overshoots the bound of the
B^0 -> rho^0 rho^0 branching ratio, and deteriorates the predictions for the
B^\pm -> pi^0 K^\pm and B^0 -> pi^\mp K^\pm direct CP asymmetries.


title: Leading neutron spectra

abstract:
  It is shown that the observation of the spectra of leading neutrons from
proton beams can be a good probe of absorptive and migration effects. We
quantify how these effects modify the Reggeized pion-exchange description of
the measurements of leading neutrons at HERA. We are able to obtain a
satisfactory description of all the features of these data. We also briefly
discuss the corresponding data for leading baryons produced in hadron-hadron
collisions.


title: A study of the Okubo-Zweig-Iizuka rule violations in $\eta_c\to VV$

abstract:
  We discuss the Okubo-Zweig-Iizuka (OZI) rule violation effects in $\eta_c\to
VV$ in light of the new data from BES Collaboration. In particular, a possible
non-vanishing branching ratio for $\eta_c\to \omega\phi$ provides a hint of the
degrees of OZI violations based on a recent factorization proposed for
charmonium hadronic decays. The violation mechanism is studied via an
intermediate meson exchange model. The results are consistent with the
experimental observations.


title:
Quark-hadron duality and hadron properties from correlators of
  pseudoscalar and axial currents

abstract:
  We study the operator product expansion (OPE) and quark-hadron duality for 2-
and 3-point correlators of the axial (A) and pseudoscalar (P) currents of the
light quarks. In the chiral limit these correlators are often dominated by
nonperturbative power corrections leading to subtleties of quark-hadron duality
relations and of the extraction of properties of light pseudoscalars. For the
2-point correlators, we show the sum rule for $<PP>$ to be sensitive to the
excited light pseudoscalar. For the 3-point correlators, we derive the Ward
identites which provide the normalization of the pion electromagnetic form
factor at zero momentum transfer. For large momentum transfer, we demonstrate
the way the correct behaviour of the pion form factor in agreement with
perturbative QCD emerges from condensate terms in the OPE for the $<PVP>$ and
$<AVP>$ correlators. The local-duality sum rule for $<AVA>$ is shown to lead to
the pion form factor with the required properties for all values of the
momentum transfer.


title:
Absence of the London limit for the first-order phase transition to a
  color superconductor

abstract:
  We study the effects of gauge-field fluctuations on the free energy of a
homogeneous color superconductor in the color-flavor-locked (CFL) phase.
Gluonic fluctuations induce a strong first-order phase transition, in contrast
to electronic superconductors where this transition is weakly first order. The
critical temperature for this transition is larger than the one corresponding
to the diquark pairing instability. The physical reason is that the gluonic
Meissner masses suppress long-wavelength fluctuations as compared to the normal
conducting phase where gluons are massless, which stabilizes the
superconducting phase. In weak coupling, we analytically compute the
temperatures associated with the limits of metastability of the normal and
superconducting phases, as well as the latent heat associated with the
first-order phase transition. We then extrapolate our results to intermediate
densities and numerically evaluate the temperature of the fluctuation-induced
first-order phase transition, as well as the discontinuity of the diquark
condensate at the critical point. We find that the London limit of magnetic
interactions is absent in color superconductivity.


title: Qualitative solution of QCD sum rules

abstract:
  We show how such important features of QCD as chiral symmetry breaking or the
formation of a mass-gap can be directly traced from QCD sum rules for two point
functions assuming, in the large number of colors limit, exact duality between
the operator product expansion and the spectrum described by linearly (or
nearly linear) rising Regge trajectories as predicted by string theory. We see
how the presence of chiral symmetry breaking is intimately related to
confinement in this scenario, as expected from general arguments, and how Regge
trajectories change when chiral symmetry is broken. As a result the whole meson
mass spectrum can be parametrized with a good accuracy by the constant
$f_{\pi}$ only, thus realizing the program proposed by Migdal some time ago.


title: Phenomenological Indications of the Scale of Supersymmetry

abstract:
  Electroweak precision measurements can provide indirect information about the
possible scale of supersymmetry already at the present level of accuracy. We
update the present-day sensitivities of precision data using the new
experimental top-quark mass, m_t = 172.7 \pm 2.9 GeV, within the constrained
minimal supersymmetric extension of the Standard Model (CMSSM), in which there
are three independent soft supersymmetry-breaking parameters m_{1/2}, m_0 and
A_0. In addition to M_W and sin^2 theta_eff, the analysis is based on
(g-2)_\mu, BR(b -> s gamma) and the lightest MSSM Higgs boson mass, M_h.
Assuming initially that the lightest supersymmetric particle (LSP) is a
neutralino, we display the CMSSM results as functions of m_{1/2}, fixing m_0 so
as to obtain the cold dark matter density allowed by WMAP and other
cosmological data for specific values of A_0, tan_beta and mu > 0. For a sample
value of tan_beta we analyze how the global chi^2 function would change
following a possible future evolution of the experimental central value of m_t
and its error. In a second step, we extend the analysis to other constrained
versions of the MSSM: the NUHM in which the soft supersymmetry-breaking
contributions to the Higgs masses are independent and the Higgs mixing
parameter mu and the pseudoscalar Higgs mass M_A become additional free
parameters compared to the CMSSM, a VCMSSM in which the bilinear soft
supersymmetry breaking parameter B_0 = A_0 - m_0, and the GDM in which the LSP
is the gravitino. In all scenarios we find indications for relatively light
soft supersymmetry-breaking masses, offering good prospects for the LHC and the
ILC, and in some cases also for the Tevatron.


title: Shear Viscosity of Hot QED at Finite Density from Kubo Formula

abstract:
  Within the framework of finite temperature field theory this paper discusses
the shear viscosity of hot QED plasma through Kubo formula at one-loop skeleton
diagram level with a finite chemical potential. The effective widths(damping
rates) are introduced to regulate the pinch singularities. The finite chemical
potential, which enhances the contributions to the shear viscosity from the
electrons while suppresses those from the photons, finally gives a positive
contribution compared to the pure temperature environment. The result agrees
with that from the kinetics theory qualitatively.


title: Self-consistent quasi-particle model for relativistic plasma

abstract:
  Relativistic plasma with radiation at thermodynamic equilibrium is ageneral
system of interest in astrophysics and high energy physics. We develop a new
self-consistent quasi-particle model for such a system to take account of
collective behaviour of plasma andthermodynamic properties are derived. It is
applied to electrodynamic plasma and quark gluon plasma and compared with
existing results.


title: Reply to comments on "A QCD sum rule study of the light scalar mesons"

abstract:
  This paper has been withdrawn by the author since the comments have been
withdrawn.


title: Reexamining charmless B\to PV decays in QCD factorization approach

abstract:
  Using the QCD factorization approach, we reexamine the two-body hadronic
charmless $B$-meson decays to final states involving a pseudoscalar~($P$) and a
vector~($V$) meson, with inclusion of the penguin contractions of
spectator-scattering amplitudes induced by the $b\to D g^\ast g^\ast$~(where
$D=d$ or $s$, and $g^\ast$ denotes an off-shell gluon) transitions, which are
of order $\alpha_s^2$. Their impacts on the CP-averaged branching ratios and
CP-violating asymmetries are examined. We find that these higher order penguin
contraction contributions have significant impacts on some specific decay
modes. Since $B\to \pi K^{\ast}$, $K \rho$ decays involve the same electro-weak
physics as $B\to \pi K$ puzzles, we present a detailed analysis of these decays
and find that the five R-ratios for $B\to \pi K^{\ast}$, $K \rho$ system are in
agreement with experimental data except for $R(\pi K^*)$. Generally, these new
contributions are found to be important for penguin-dominated $B\to PV$ decays.


title: More on the infrared renormalization group limit cycle in QCD

abstract:
  We present a detailed study of the recently conjectured infrared
renormalization group limit cycle in QCD using chiral effective field theory.
It was conjectured that small increases in the up and down quark masses can
move QCD to the critical trajectory for an infrared limit cycle in the
three-nucleon system. At the critical quark masses, the binding energies of the
deuteron and its spin-singlet partner are tuned to zero and the triton has
infinitely many excited states with an accumulation point at the three-nucleon
threshold. We exemplify three parameter sets where this effect occurs at
next-to-leading order in the chiral counting. For one of them, we study the
structure of the three-nucleon system in detail using both chiral and contact
effective field theories. Furthermore, we investigate the matching of the
chiral and contact theories in the critical region and calculate the influence
of the limit cycle on three-nucleon scattering observables.


title: Chiral phase boundary of QCD at finite temperature

abstract:
  We analyze the approach to chiral symmetry breaking in QCD at finite
temperature, using the functional renormalization group. We compute the running
gauge coupling in QCD for all temperatures and scales within a simple truncated
renormalization flow. At finite temperature, the coupling is governed by a
fixed point of the 3-dimensional theory for scales smaller than the
corresponding temperature. Chiral symmetry breaking is approached if the
running coupling drives the quark sector to criticality. We quantitatively
determine the phase boundary in the plane of temperature and number of flavors
and find good agreement with lattice results. As a generic and testable
prediction, we observe that our underlying IR fixed-point scenario leaves its
imprint in the shape of the phase boundary near the critical flavor number:
here, the scaling of the critical temperature is determined by the
zero-temperature IR critical exponent of the running coupling.


title:
Fast Neutron - Mirror Neutron Oscillation and Ultra High Energy Cosmic
  Rays

abstract:
  If there exists the mirror world, a parallel hidden sector of particles with
exactly the same microphysics as that of the observable particles, then the
primordial nucleosynthesis constraints require that the temperature of the
cosmic background of mirror relic photons should be smaller than that of the
ordinary relic photons, T'/T < 0.5 or so. On the other hand, the present
experimental and astrophysical limits allow a rather fast neutron - mirror
neutron oscillation in vacuum, with an oscillation time $\tau \sim 1$ s, much
smaller than the neutron lifetime. We show that this could provide a very
efficient mechanism for transporting ultra high energy protons at large
cosmological distances. The mechanism operates as follows: a super-GZK energy
proton scatters a relic photon producing a neutron that oscillates into a
mirror neutron which then decays into a mirror proton. The latter undergoes a
symmetric process, scattering a mirror relic photon and producing back an
ordinary nucleon, but only after traveling a distance $(T/T')^{3}$ times larger
than ordinary protons. This may relax or completely remove the GZK-cutoff in
the cosmic ray spectrum and also explain the correlation between the observed
ultra high energy protons and far distant sources as are the BL Lacs.


title: Pomeron structure functions from HERA to Tevatron and LHC

abstract:
  The proton diffractive structure function $F_2^{D(3)}$ measured in the H1 and
ZEUS experiments at HERA are analysed in terms of perturbative QCD in the
perspective of the QCD extrapolation to the Tevatron and the LHC. It is shown
that both data sets can be well described by a QCD analysis in which point-like
parton distributions, evolving according to the next-leading DGLAP equations,
are assigned to the leading and sub-leading Regge exchanges. For present data
from H1 and ZEUS the gluon distributions are found to be quite different and we
give the corresponding sets of quark and gluon parton distributions for the
Pomeron, extracted from the two experiments. An extrapolation to the Tevatron
range is compared with CDF data on single diffraction. Conclusions on
factorization breaking between HERA and Tevatron critically depend on whether
H1 (strong violation) or ZEUS (compatibility at low $\beta$) fits are taken
into account. Using the double Pomeron formulation in central diffractive dijet
production we show that the Tevatron mass fraction is much sensitive to the
high $\beta$ tail of the gluon in the Pomeron, suggesting a new way of handling
the otherwise badly known gluon distribution in the Pomeron. Extrapolation of
the fits to very high $Q^2$ are given since they will be relevant for QCD and
diffraction studies at the LHC.


title: Linear Confinement and AdS/QCD

abstract:
  In a theory with linear confinement, such as QCD, the masses squared m^2 of
mesons with high spin S or high radial excitation number n are expected, from
semiclassical arguments, to grow linearly with S and n. We show that this
behavior can be reproduced within a putative 5-dimensional theory
holographically dual to QCD (AdS/QCD). With the assumption that such a dual
theory exists and describes highly excited mesons as well, we show that
asymptotically linear m^2 spectrum translates into a strong constraint on the
INFRARED behavior of that theory. In the simplest model which obeys such a
constraint we find m^2 ~ (n+S).


title:
Neutralino with the Right Cold Dark Matter Abundance in (Almost) Any
  Supersymmetric Model

abstract:
  We consider non-standard cosmological models in which the late decay of a
scalar field $\phi$ reheats the Universe to a low reheating temperature,
between 5 MeV and the standard freeze-out temperature of neutralinos of mass
$m_{\chi}$. We point out that in these models all neutralinos with standard
density $\Omega_{\rm std} \gtrsim 10^{-5} (100 {\rm GeV}/m_\chi)$ can have the
density of cold dark matter, provided the right combination of the following
two parameters can be achieved in the high energy theory: the reheating
temperature, and the ratio of the number of neutralinos produced per $\phi$
decay over the $\phi$ field mass. We present the ranges of these parameters
where a combination of thermal and non-thermal neutralino production leads to
the desired density, as functions of $\Omega_{\rm std}$ and $m_{\chi}$.


title:
Importance of Higher Twist Effects to Understand Charmed
  Color-Suppressed $B$ Decays

abstract:
  Working within the framework of the QCD light cone sum rules (LCSR), we
compute and discuss the nonfactorizable higher twist effect in $\bar{B}^0\to
D^{*0}\pi^0$ to make an all-around examination of its role in the charmed
color-suppressed B decays. Analogously to the case of $\bar{B}^0\to
D^{0}\pi^0$, such effect turns out to be of the same strong phase as the
factorizable amplitude, and modifies constructively the magnitude by order
$(40-90)%$ so that the effective coefficient $a_2^{f}=C_1+C_2/3$ receives a
positive correction comparable numerically with it. Nonleading as the soft
effect in question is, our findings for it, along with the previous LCSR
analyses of $\bar{B}^0\to D^{0}\pi^0$, are suggestive of the dominance of soft
exchanges in these charmed color suppressed B decays. Also, the emphases are
put on importance of understanding intensively various related higher twist and
transverse momentum effects to interpret the data on $B \to
D^{0(*0)}(\pi^0,\eta,\eta'),J/\psi K^{(*)}$.


title:
The process $\epem\to J/ \psi X(3940)$ at $\sqrt s = 10.6$ GeV in the
  framework of light cone formalism

abstract:
  This paper is devoted to the study of the process $\epem\to J/\psi X(3940)$
in the framework of light cone formalism. In our calculation two hypotheses
about the structure of X(3940) meson are considered: X(3940) is $3^1$S$_0$
state and X(3940) is one of $2^3$P states. The former hypothesis leads to a
good agreements with the cross section measured at the experiment. As to the
latter one, it is proposed a mechanism that allows one to understand the
suppression of 2P mesons production in hard processes.


title:
Channel coupling in e+ e- annihilation into heavy meson pairs at the D*
  {\bar D}* threshold

abstract:
  A threshold singularity in a heavier meson channel, e.g. $D^* {\bar D}^*$,
generally reflects in the amplitudes of $e^+e^-$ annihilation into lighter
meson pairs, such as $D^* {\bar D}$, $D {\bar D}$, and $D_s {\bar D}_s$, due to
the channel coupling. The behavior of the cross section of the $e^+e^-$
annihilation into each channel in this situation is considered using general
properties of the amplitudes near the new threshold. It is argued that the
effects of the channel coupling can be quite significant in the observable
cross section, in particular near the $D^* {\bar D}^*$ threshold.


title: Revisiting \gamma\gamma->\pi^+\pi^- at low energies

abstract:
  We complete the recalculation of the available two-loop expressions for the
reaction \gamma\gamma->\pi\pi in the framework of chiral perturbation theory.
Here, we present the results for charged pions. The cross section and the
values of the dipole polarizabilities agree very well with the earlier
calculation, provided the same set of low-energy constants (LECs) is used. With
updated values for the LECs at order p^4, we find for the dipole
polarizabilities (\alpha_1-\beta_1)_{\pi^\pm} = (5.7\pm 1.0) 10^{-4} fm^3,
which is in conflict with the experimental result recently reported by the MAMI
Collaboration.


title: Nuclear effects in leptoproduction of secondaries

abstract:
  We estimate the energy losses in the case of deep-inelastic scattering on
nuclear targets in terms of the effective change of the virtual photon energy.
Our phenomenological results are in reasonable agreement with theoretical
calculations. The difference in secondary production processes in hard and soft
interactions is discussed.


title: Sea quark polarization and semi-inclusive DIS data

abstract:
  We investigate the potential impact of forthcoming Jefferson Lab
semi-inclusive polarized deep inelastic scattering proton measurements in the
determination of the sea quark polarization in the nucleon by means of a next
to leading order global QCD analysis. Specifically, we estimate the resulting
improvement in the constraints on polarized parton densities for the different
flavors, which is found to be significant for up and strange quarks, and the
correlation between remaining uncertainty ranges for each of the parton
species.


title: A Three-Flavor, Lorentz-Violating Solution to the LSND Anomaly

abstract:
  We investigate whether postulating the existence of Lorentz-violating,
CPT-conserving interactions allows three-neutrino solutions to the LSND anomaly
that are also consistent with all other neutrino data. We show that
Lorentz-violating interactions that couple only to one of the active neutrinos
have the right properties to explain all the data. The details of the data make
this solution unattractive. We find, for example, that a highly non-trivial
energy dependence of the Lorentz-violating interactions is required.


title:
Parametrization of a nonlocal, chiral quark model in the instantaneous
  three-flavor case. Basic formulas and tables

abstract:
  In these notes we describe the basic formulation of the parametrization
scheme for the instantaneous nonlocal chiral quark model in the three flavor
case. We choose to discuss the Gaussian, Lorentzian-type, Woods-Saxon and sharp
cutoff (NJL) functional forms of the momentum dependence for the formfactor of
the separable interaction. The four parameters: light and strange quark mass,
coupling strength (G_S) and range of the interaction (Lambda) have been fixed
by the same phenomenological inputs: pion and kaon mass, pion decay constant
and light quark mass in vacuum. The Wood-Saxon and Lorentzian-type formfactor
is suitable for an interpolation between sharp cutoff and soft momentum
dependence. Results are tabulated for applications in models of hadron
structure and quark matter at finite temperatures and chemical potentials where
separable models have proven successful.


title:
A Unified Picture for Single Transverse-Spin Asymmetries in Hard
  Processes

abstract:
  Using Drell-Yan pair production as an example, we explore the relation
between two well-known mechanisms for single transverse-spin asymmetries in
hard processes: twist-three quark-gluon correlations when the pair's transverse
momentum is large, $q_\perp \gg \Lambda_{\rm QCD}$, and time-reversal-odd and
transverse-momentum-dependent parton distributions when $q_\perp$ is much less
than the pair's mass. We find that although the two mechanisms have their own
domain of validity, they describe the same physics in the kinematic region
where they overlap. This unifies the two mechanisms and imposes an important
constraint on phenomenological studies of single spin asymmetries.


title: Neutrino Mass Implications for Muon Decay Parameters

abstract:
  We use the scale of neutrino mass to derive model-independent naturalness
constraints on possible contributions to muon decay Michel parameters from new
physics above the electroweak symmetry-breaking scale. Focusing on Dirac
neutrinos, we obtain a complete basis of effective dimension four and dimension
six operators that are invariant under the gauge symmetry of the Standard Model
and that contribute to both muon decay and neutrino mass. We show that -- in
the absence of fine tuning -- the most stringent bounds on chirality-changing
operators relevant to muon decay arise from one-loop contributions to neutrino
mass. The bounds we obtain on their contributions to the Michel parameters are
four or more orders of magnitude stronger than bounds previously obtained in
the literature. We also show that there exist chirality-changing operators that
contribute to muon decay but whose flavor structure allows them to evade
neutrino mass naturalness bounds. We discuss the implications of our analysis
for the interpretation of muon decay experiments.


title:
Effect due to charge symmetry violation on the Paschos-Wolfenstein
  relation

abstract:
  The modification of the Paschos-Wolfenstein relation is investigated when the
charge symmetry violations of valence and sea quark distributions in the
nucleon are taken into account. We also study qualitatively the impact of
charge symmetry violation (CSV) effect on the extraction of
$\sin^{2}\theta_{w}$ from deep inelastic neutrino- and antineutrino-nuclei
scattering within the light-cone meson-baryon fluctuation model. We find that
the effect of CSV is too small to give a sizable contribution to the NuTeV
result with various choices of mass difference inputs, which is consistence
with the prediction that the strange-antistrange asymmetry can account for
largely the NuTeV deviation in this model. It is noticeable that the effect of
CSV might contribute to the NuTeV deviation when the larger difference between
the internal momentum scales, $\alpha_{p}$ of the proton and $\alpha_{n}$ of
the neutron, is considered.


title:
Basis-independent methods for the two-Higgs-doublet model II. The
  significance of tan(beta)

abstract:
  In the most general two-Higgs-doublet model (2HDM), there is no distinction
between the two complex hypercharge-one SU(2) doublet scalar fields, Phi_a
(a=1,2). Thus, any two orthonormal linear combinations of these two fields can
serve as a basis for the Lagrangian. All physical observables of the model must
therefore be basis-independent. For example, tan(beta)=<Phi_2^0>/<Phi_1^0> is
basis-dependent and thus cannot be a physical parameter of the model. In this
paper, we provide a basis-independent treatment of the Higgs sector with
particular attention to the neutral Higgs boson mass-eigenstates, which
generically are not eigenstates of CP. We then demonstrate that all physical
Higgs couplings are indeed independent of tan(beta). In specialized versions of
the 2HDM, tan(beta) can be promoted to a physical parameter of the
Higgs-fermion interactions. In the most general 2HDM, the Higgs-fermion
couplings can be expressed in terms of a number of physical "tan(beta)--like"
parameters that are manifestly basis-independent. The minimal supersymmetric
extension of the Standard Model provides a simple framework for exhibiting such
effects.


title: Non leptonic B decays to axial-vector mesons and factorization

abstract:
  We present an analysis of two-body B decays with a pseudoscalar (P) and an
axial-vector meson (A) in the final state using naive factorization. We employ
as inputs a limited number of experimental data, i.e. results for the B -> K1
gamma and B -> K* gamma radiative decays and the branching ratios for B ->
pion+rho, pion+K*, K+rho, K+pion non leptonic decays. In this way we are able
to make predictions on several B -> P A decays that might be used as a guide
for experimental researches of these decays and as tests of factorization.


title:
S4 Flavor Symmetry and Fermion Masses: Towards a Grand Unified theory of
  Flavor

abstract:
  Pursuing a bottom-up approach to explore which flavor symmetry could serve as
an explanation of the observed fermion masses and mixings, we discuss an
extension of the standard model (SM) where the flavor structure for both quarks
and leptons is determined by a spontaneously broken S4 and the requirement that
its particle content is embeddable simultaneously into the conventional SO(10)
grand unified theory (GUT) and a continuous flavor symmetry G_f like SO(3)_f or
SU(3)_f. We explicitly provide the Yukawa and the Higgs sector of the model and
show its viability in two numerical examples which arise as small deviations
from rank one matrices. In the first case, the corresponding mass matrix is
democratic and in the second one only its 2-3 block is non-vanishing. We
demonstrate that the Higgs potential allows for the appropriate vacuum
expectation value (VEV) configurations in both cases, if CP is conserved. For
the first case, the chosen Yukawa couplings can be made natural by invoking an
auxiliary Z2 symmetry. The numerical study we perform shows that the best-fit
values for the lepton mixing angles theta_12 and theta_23 can be accommodated
for normal neutrino mass hierarchy. The results for the quark mixing angles
turn out to be too small. Furthermore the CP-violating phase delta can only be
reproduced correctly in one of the examples. The small mixing angle values are
likely to be brought into the experimentally allowed ranges by including
radiative corrections. Interestingly, due to the S4 symmetry the mass matrix of
the right-handed neutrinos is proportional to the unit matrix.


title: Charm and Beauty in a Hot Environment

abstract:
  We discuss the spectral analysis of quarkonium states in a hot medium of
deconfined quarks and gluons, and we show that such an analysis provides a way
to determine the thermal properties of the quark-gluon plasma.


title:
Coupling constants and transition potentials for hadronic decay modes of
  a meson

abstract:
  Within the independent-harmonic-oscillator model for quarks inside a hadron,
a rigorous method is presented for the calculation of coupling constants and
transition potentials for hadronic decay, as needed in a multi-channel
description of mesons.


title:
On the role of hard rescattering in exclusive diffractive Higgs
  production

abstract:
  We discuss the contribution of so-called semi-enhanced hard rescattering
corrections to central exclusive diffractive Higgs production, pp -> p+H+p, at
the LHC. We present arguments to show that these corrections are small. We
confirm these expectations by considering HERA data for leading neutron
production.


title: Recoupling matrix elements and decay

abstract:
  Recoupling matrix elements are evaluated, in the harmonic oscillator
approximation, for all possible angular and radial excitations in processes
where quarks recombine. A diagrammatic representation is given. Their use is
demonstrated in calculating the transition potential for rho to two pions in a
pair creation model.


title: Dissipative Hydrodynamics and Heavy Ion Collisions

abstract:
  Recent discussions of RHIC data emphasized the exciting possibility that the
matter produced in nucleus-nucleus collisions shows properties of a
near-perfect fluid. Here, we aim at delineating the applicability of fluid
dynamics, which is needed to quantify the size of corresponding dissipative
effects. We start from the equations for dissipative fluid dynamics, which we
derive from kinetic theory up to second order (Israel-Stewart theory) in a
systematic gradient expansion. In model studies, we then establish that for too
early initialization of the hydrodynamic evolution ($\tau_0 \lsim 1$ fm/c) or
for too high transverse momentum ($p_T \gsim 1$ GeV) in the final state, the
expected dissipative corrections are too large for a fluid description to be
reliable. Moreover, viscosity-induced modifications of hadronic transverse
momentum spectra can be accommodated to a significant degree in an ideal fluid
description by modifications of the decoupling stage. We argue that these
conclusions, drawn from model studies, can also be expected to arise in
significantly more complex, realistic fluid dynamics simulations of heavy ion
collisions.


title:
The effect of NLO conformal spins in azimuthal angle decorrelation of
  jet pairs

abstract:
  Azimuthal angle decorrelation in inclusive dijet cross sections is studied
analytically to take into account the next-to-leading corrections to the BFKL
kernel while keeping the jet vertices at leading order. The spectral
representation on the basis of leading order eigenfunctions is generalized to
include the dependence on conformal spins. With this procedure running coupling
effects and angular dependences are both included. It is shown how the angular
decorrelation for jets with a wide relative separation in rapidity largely
decreases at this higher order in the resummation.


title:
Collective excitations, instabilities, and ground state in dense quark
  matter

abstract:
  We study the spectrum of light plasmons in the (gapped and gapless)
two-flavor color superconducting phases and its connection with the
chromomagnetic instabilities and the structure of the ground state. It is
revealed that the chromomagnetic instabilities in the 4-7th and 8th gluonic
channels correspond to two very different plasmon spectra. These spectra lead
us to the unequivocal conclusion about the existence of gluonic condensates
(some of which can be spatially inhomogeneous) in the ground state. We also
argue that spatially inhomogeneous gluonic condensates should exist in the
three-flavor quark matter with the values of the mass of strange quark
corresponding to the gapless color-flavor locked state.


title: Hadronic Spectra and Light-Front Wavefunctions in Holographic QCD

abstract:
  We show how the string amplitude $\Phi(z)$ defined on the fifth dimension in
AdS$_5$ space can be precisely mapped to the light-front wavefunctions of
hadrons in physical spacetime. We find an exact correspondence between the
holographic variable $z$ and an impact variable $\zeta$, which represents the
measure of transverse separation of the constituents within the hadrons. In
addition, we derive effective four dimensional Schr\"odinger equations for the
bound states of massless quarks and gluons which exactly reproduce the AdS/CFT
results and give a realistic description of the light-quark meson and baryon
spectrum as well as the form factors for spacelike $Q^2$. Only one parameter
which sets the mass scale, $\Lambda_{QCD}$, is introduced.


title:
NuFact05 Working Group 2 Summary: Experimental Results in Neutrino
  Scattering Physics

abstract:
  This paper summarizes new experimental results in low energy neutrino cross
sections as presented in the neutrino scattering working group at the NuFact05
workshop. Several questions and directives for future NuFact workshops are also
outlined.


title:
NuInt05 Session Two Summary: New Experimental Results in Neutrino
  Scattering Physics

abstract:
  We summarize the discussion and presentation of new experimental results in
low energy neutrino scattering at the NuInt05 workshop. In addition, we comment
on several investigations that should be targeted in preparation for the next
NuInt workshop.


title: Exclusive Baryonic B Decays Circa 2005

abstract:
  The status of exclusive two-body and three-body baryonic B decays is
reviewed. The threshold enhancement effect in the dibaryon invariant mass and
the angular distributions in the dibaryon rest frame are stressed and
explained. Weak radiative baryonic B decays mediated by the electromagnetic
penguin process $b\to s\gamma$ are discussed. Puzzles with the correlation
observed in $B^-\to p\bar pK^-$ decay and the unexpectedly large rate observed
for $B\to\Lambda_c\bar\Lambda_cK$ are examined. The former may indicate that
the $p\bar p$ system is produced through some intermediate states, while the
latter implies the failure of naive factorization for $\Lambda\bar\Lambda K$
modes and may hint at the importance of final-state rescattering effects.


title: New Basis for the Standard Model for Electroweak Interactions

abstract:
  The standard model for electroweak interactions uses the concepts of weak
hypercharge and local gauge invariance of the Lagrangian density under the
gauge group SU(2) x U(1). Taylor has remarked that U(1), being a
multiply-connected group, in general, should have different coupling strengths
for singlets and doublets. But in the development of the standard model, even
for U(1), the coupling strength has been taken to be the same for all the
multiplets without a priori justification. Wilczek has pointed out that the
assignment of hypercharge values to left- and right-handed leptons and quarks
is very peculiar. However, no solution has been provided. Ellis has also
reservations for the rather bizarre set up of group representations and
hypercharges. It has also been noticed that, in addition to the above weak
points of the model, the generator of the group U(1) is changed at different
stages during a single analysis. In this paper, a new basis is provided that
avoids these peculiar and odd concepts and hypercharge assignments, and a
satisfactory solution is given for the first time. This is done by generalising
the expression for the transformation law for 4-vector potential in
electromagnetism. It gives exactly the same results as obtained in the standard
model for electroweak interactions.


title:
Q^2 dependence of azimuthal asymmetries in semi-inclusive deep inelastic
  scattering and in Drell-Yan

abstract:
  We study several azimuthal asymmetries in semi-inclusive deep inelastic
scattering and in Drell-Yan, interpreting them in the framework of the
formalism of the quark correlator, with a particular reference to T-odd
functions. The correlator contains an undetermined energy scale, which we fix
on the basis of a simple and rather general argument. We find a different value
than the one assumed in previous treatments of T-odd functions. This implies
different predictions on the Q^2 dependence of the above mentioned asymmetries.
Our result about the azimuthal asymmetry of unpolarized Drell-Yan agrees with
presently available data, contrary to the alternative assumption on the scale.
Predictions on other azimuthal asymmetries could be tested against data of
planned experiments on Drell-Yan and semi-inclusive deep inelastic scattering.


title: Deep Inelastic Structure Functions at small x

abstract:
  Explicit expressions for the non-singlet and singlet structure functions g_1
in the small-x region are obtained. They include the total resummation of the
double- and single- logarithms of x and account for the running QCD coupling
effects. Both the non-singlet and singlet structure functions are Regge
behavied asymptotically, with the intercepts predicted in agreement with
experiments. A detailed comparison with the DGLAP evolution equations for
different values of x and Q^2 is performed. Finally, the role played by
singular terms in DGLAP fits is discussed and explicitly shown to mimic the
resummation of leading logarithms at small x.


title:
Structure of the $D_{s0}(2317)$ and the strong coupling constant
  $g_{D_{s0} D K}$ with the light-cone QCD sum rules

abstract:
  In this article, we take the point of view that the charmed scalar meson
$D_{s0}(2317)$ is the conventional $c\bar{s}$ meson and calculate the strong
coupling constant $g_{D_{s0} D K}$ within the framework of the light-cone QCD
sum rules approach. The numerical values for the large scalar-$DK$ coupling
constant $g_{D_{s0} D K}$ support the hadronic dressing mechanism. Just like
the scalar mesons $f_0(980)$ and $a_0(980)$, the $D_{s0}(2317)$ may have small
scalar $c\bar{s}$ kernel of the typical $c\bar{s}$ meson size. The strong
coupling to the hadronic channels (or the virtual mesons loops) may result in
smaller mass than the conventional scalar $c\bar{s}$ meson in the constituent
quark models, and enrich the pure $c\bar{s}$ state with other components. The
$D_{s0}(2317)$ may spend part (or most part) of its lifetime as virtual $ D K $
state.


title: Low-lying di-hadronic states in relativistic harmonic model

abstract:
  Di-hadronic molecules such as di-meson, meson-baryon and di-baryon states are
studied in the relativistic confinement model. We have computed the binding
energy of the di-hadronic systems like $K-N$, $\Pi-N$, $\rho-N$ etc., as
penta-quark states, 2$\pi$, $\rho-\rho$, $K-K^*$, $K^*-K^*$, $D-D^*$ etc. as
tetra-quark states and $N-N$, $N-\Delta$, $\Delta-\Delta$ etc. as di-baryonic
states using a molecular interaction provided by asymptotic expression of the
confined gluon exchange potential. We find the lowest penta-quark state lies in
the energy range of 1.180 - 2.247 GeV as predicted by other theoretical models.
The exotic states such as $f0 (0.982)$, $h1 (1.170)$, $f0 (1.70)$, $f2
(1.565)$, $f2 (1.95)$, $\psi(4.040)$ etc. are identified as the di-mesonic
hadron molecules. The low-lying di-baryon molecular states found to be in the
range of 1.990-2.907 GeV with their binding energies lying between 112-120 MeV.


title:
Sterile neutrinos: direct mixing effects versus induced mass matrix of
  active neutrinos

abstract:
  Mixing of active neutrinos with sterile ones generate ``induced''
contributions to the mass matrix of active neutrinos $\sim m_S
\sin^2\theta_{aS}$, where $m_S$ is the Majorana mass of the sterile neutrino
and $\theta_{aS}$ is the active-sterile mixing angle. We study possible effects
of the induced matrix which can modify substantially the implications of
neutrino oscillation results. We have identified the regions of $m_S$ and
$\sin^2\theta_{aS}$ where the induced matrix (i) provides the dominant
structures, (ii) gives the sub-dominant effects and (iii) where its effects can
be neglected. The induced matrix can be responsible for peculiar properties of
the lepton mixing and neutrino mass spectrum, in particular, it can generate
the tri-bimaximal mixing. We update and discuss bounds on the induced masses
from laboratory measurements, astrophysics and cosmology. We find that
substantial impact of the induced matrix is possible if $m_S \sim 0.1-1$ eV and
$\sin^2\theta_{aS} \sim 10^{-3} - 10^{-2}$ or $m_S \geq 200$ MeV and
$\sin^2\theta_{aS} \leq 10^{-9}$. The bounds can be relaxed in cosmological
scenarios with low reheating temperature, if sterile neutrinos decay
sufficiently fast, or their masses change with time.


title: Testing the theory of QGP-induced energy loss at RHIC and the LHC

abstract:
  We compare an analytic model of jet quenching, based on the GLV non-Abelian
energy loss formalism, to numerical results for the centrality dependent
suppression of hadron cross sections in Au+Au and Cu+Cu collisions at RHIC.
Simulations of neutral pion quenching versus the size of the colliding nuclear
system are presented to high transverse momentum pT. At low and moderate pT, we
study the contribution of medium-induced gluon bremsstrahlung to single
inclusive hadron production. In Pb+Pb collisions at the LHC, the redistribution
of the lost energy is shown to play a critical role in yielding nuclear
suppression that does not violate the participant scaling limit.


title: Analytical solution of ttbar dilepton equations

abstract:
  The top quark antiquark production system in the dilepton decay channel is
described by a set of equations which is nonlinear in the unknown neutrino
momenta. Its most precise and least time consuming solution is of major
importance for measurements of top quark properties like the top quark mass and
$t\bar{t}$ spin correlations. The initial system of equations can be
transformed into two polynomial equations with two unknowns by means of
elementary algebraic operations. These two polynomials of multidegree two can
be reduced to one univariate polynomial of degree four by means of resultants.
The obtained quartic equation is solved analytically.


title: Neutrino Factory and Beta Beam Experiment

abstract:
  I summarize the current understanding of the neutrino oscillation physics
with a neutrino factory and a beta beam, where I emphasize more recent
phenomenological developments.


title: $B \to \pi \pi$ decays: branching ratios and CP asymmetries

abstract:
  Theoretically motivated smallness of the penguin amplitude in $B \to \pi \pi$
decays allowes to calculate the value of the unitarity triangle angle $\alpha
(\phi_2)$ with good accuracy. The relatively large branching ratio of the decay
into $\pi^0 \pi^0$ is explained by the large value of FSI phase difference
between $\Delta I = 1/2$ and $\Delta I = 3/2$ tree amplitudes.


title: Towards Working Technicolor: Effective Theories and Dark Matter

abstract:
  A fifth force, of technicolor type, responsible for breaking the electroweak
theory is an intriguing extension of the Standard Model. Recently new theories
have been shown to feature walking dynamics for a very low number of
techniflavors and are not ruled out by electroweak precision measurements. We
identify the light degrees of freedom and construct the associated low energy
effective theories. These can be used to study signatures and relevant
processes in current and future experiments. In our theory the technibaryons
are pseudo Goldstone bosons and their masses arise via extended technicolor
interactions. There are hypercharge assignments for the techniquarks which
renders one of the technibaryons electrically neutral. We investigate the
cosmological implications of this scenario and provide a component of dark
matter.


title:
Reply to ``Reply to comment on A QCD sum rule study of the light scalar
  mesons"

abstract:
  This paper has been withdrawn by the authors. We have discovered an error in
the evaluation of the diagram, which invalidates our conclusion.


title:
Control of quantum fluctuations for a Yukawa interaction in the Kaluza
  Klein picture

abstract:
  We study a system of fermions interacting with a scalar field, in 4+1
dimensions where the 5th dimension is compactified, using an exact functional
method, where quantum fluctuations are controlled by the amplitude of the bare
fermion mass. The integration of our equationsleads to the properties of the
dressed Yukawa coupling, that we study at one-loop so as to show the
consistency of the approach. Beyond one loop, the non-perturbative aspect of
the method gives us the possibility to derive the dynamical fermion mass. The
result obtained is cut off independent and this derivation proposes an
alternative to the Schwinger-Dyson approach.


title:
Deep inelastic beauty production at HERA in the kt-factorization
  approach

abstract:
  We calculate the cross section of beauty production in electron-proton deep
inelastic scattering at HERA collider in the framework of the kt-factorization
approach. The unintegrated gluon distributions in a proton are obtained from
the full CCFM, from unified BFKL-DGLAP evolution equations as well as from the
Kimber-Martin-Ryskin prescription. We investigate different production rates
and study the b-quark contribution to the inclusive proton structure function
F2(x,Q2) at small x and at moderate and high values of Q2. Our theoretical
results are compared with the recent experimental data taken by the H1 and ZEUS
collaborations. We demonstrate the importance of leading ln 1/x contributions
in description of the HERA data.


title: A glueball component in fo(1790)

abstract:
  The omega-phi threshold peak observed by BES in J/Psi -> gamma(omega-phi) may
be interpreted quantitatively in terms of a glueball component in fo(1790).


title: Angles from $B$ Decays with Charm

abstract: Proceedings of the CKM 2005 Workshop (WG5), UC San Diego, 15-18 March 2005.


title: Grand unification of $\mu-\tau$ Symmetry

abstract:
  Near maximal neutrino mixing needed to understand atmospheric neutrino data
can be interpreted to be a consequence of an interchange symmetry between the
muon and tau neutrinos in the neutrino mass matrix in the flavor basis. This
idea can be tested by a measurement of the neutrino mixing parameter
$\theta_{13}$ and looking for its correlation with $\theta_{23}-\pi/4$. We
present a supersymmetric SU(5) grand unified model for quarks and leptons which
obeys this exchange symmetry and is a realistic model that can fit all
observations. GUT embedding shifts $\theta_{13}$ from its zero $\mu-\tau$
symmetric value to a nonzero value keeping it under an upper limit.