title:
Kink-induced symmetry breaking patterns in brane-world SU(3)^3
  trinification models

abstract:
  The trinification grand unified theory (GUT) has gauge group SU(3)^3 and a
discrete symmetry permuting the SU(3) factors. In common with other GUTs, the
attractive nature of the fermionic multiplet assignments is obviated by the
complicated multi-parameter Higgs potential apparently needed for
phenomenological reasons, and also by vacuum expectation value (VEV)
hierarchies within a given multiplet. This motivates the rigorous consideration
of Higgs potentials, symmetry breaking patterns and alternative symmetry
breaking mechanisms in models with this gauge group. Specifically, we study the
recently proposed ``clash of symmetries'' brane-world mechanism to see if it
can help with the symmetry breaking conundrum. This requires a detailed
analysis of Higgs potential global minima and kink or domain wall solutions
interpolating between the disconnected global minima created through
spontaneous discrete symmetry breaking. Sufficiently long-lived metastable
kinks can also be considered. We develop what we think is an interesting,
albeit speculative, brane-world scheme whereby the hierarchical symmetry
breaking cascade, trinification to left-right symmetry to the standard model to
colour cross electromagnetism, may be induced without an initial hierarchy in
vacuum expectation values. Another motivation for this paper is simply to
continue the exploration of the rich class of kinks arising in models that are
invariant under both discrete and continuous symmetries.


title: Implications of the non-universal Z boson in FCNC mediated rare decays

abstract:
  We analyze the effect of the non-universal $Z$ boson in the rare decays $B_s
\to l^+ l^- $, $B_s \to l^+ l^- \gamma $ and $Z \to b \bar s$ decays. These
decays involve the FCNC mediated $ b \to s $ transitions, and are found to be
very small in the standard model. The smallness of these decays in the standard
model makes them sensitive probe for new physics. We find an enhancement of at
least an order in these branching ratios because of the non-universal $Zbs$
coupling.


title: Gauge Coupling Unification in the Standard Model

abstract:
  The string landscape suggests that the supersymmetry breaking scale can be
high, and then the simplest low energy effective theory is the Standard Model
(SM). We show that gauge coupling unification can be achieved at about
10^{16-17} GeV in the SM with suitable normalizations of the U(1)_Y. Assuming
grand unification scale supersymmetry breaking, we predict that the Higgs mass
range is 127 GeV to 165 GeV, with the precise value strongly correlated with
the top quark mass and SU(3)_C gauge coupling. We also present 7-dimensional
orbifold grand unified theories in which such normalizations for the U(1)_Y and
charge quantization can be realized.


title: Cosmological evolution of cosmic strings with time-dependent tension

abstract:
  We discuss the cosmological evolution of cosmic strings with time-dependent
tension. We show that, in the case that the tension changes as a power of time,
the cosmic string network obeys the scaling solution: the characteristic scale
of the string network grows with the time. But due to the time dependence of
the tension, the ratio of the energy density of infinite strings to that of the
background universe is {\it not} necessarily constant.


title: Partial-wave analysis of $\vec{p}\vec{p}\to pp\pi^\circ$ data

abstract:
  We present a partial-wave analysis of the polarization data for the reaction
$\vec{p}\vec{p}\to pp\pi^\circ$, based solely on the recent measurements at
IUCF for this channel. The fit leads to a $\chi^2$ per degree of freedom of
1.7. Methods for an improved analysis are discussed. We compare the extracted
values to those from a meson exchange model.


title: Highlights from Five Years at the B Factories

abstract:
  The highlights and conflicts at the B Factories are briefly reviewed. $CP$
violation was established in 2001 in $B^0 \to J/\psi K_S$ and related modes,
which has now become a precision measurement of CP violation in $B^0$-$\bar
B^0$ mixing. However, the situation for the $B^0 \to \pi^+\pi^-$ and charmless
$b\to s$ modes, which probe also CP violation in the {\it decay} amplitude, are
not quite settled yet. They could be hinting at presence of both strong (CP
conserving) and new physics (CP violating) phases. We critically assess the
developments and discuss some related discrepancies and highlights, such as
observation of direct CP violation, and make a projection towards the next few
years.


title: Spectrum of the Y=2 Pentaquarks

abstract:
  By assuming a mass formula for the spectrum of the Y=2 pentaquarks, where the
chromo-magnetic interaction plays a main role, and identifying the lightest
state with the Theta^+(1540), we predict a spectrum in good agreement with the
few I=0 and I=1 candidates proposed in the past.


title:
Sleptonium at the linear collider and the slepton co-next-to-lightest
  supersymmetric particle scenario in gauge mediated symmetry breaking models

abstract:
  We discuss the possibility of formation and subsequent detection of a
supersymmetric bound state composed of a slepton--antislepton pair at the next
linear collider. The Green function method is used within a non-relativistic
approximation to estimate the threshold production cross-section of the $2P$
bound state. The parameter space of Gauge Mediated Symmetry Breaking (GMSB)
models allow a particular scenario in which a charged slepton
($\widetilde{e}_R, \widetilde{\mu}_R$ or $\widetilde{\tau}_1$) is the NLSP.
Within this scenario the produced $2P$ bound-state decays, through a dipole
transition, into the $1S$ ground-state with branching ratio $\approx 100% $
emitting a very soft ($\approx 1 $ MeV) photon which goes undetected. The
spectroscopy of the $1S$-state shows that it decays into two photons with $Br
\approx 0.5$ up to $m_{NLSP} \approx 1$ TeV. Thus NLSP sleptonium threshold
production gives rise to the signal $e^+e^- \to 2P \to 1S + "soft \gamma " \to
\gamma \gamma$ which when compared with the standard model two-photon process
($ e^+e^- \to \gamma \gamma$) has a statistical significance
($SS$=signal/noise) which, at an energy offset from threshold of E=20 GeV, goes
from $SS=11$ to $SS=2$ when the mass of the NLSP ranges in the interval
$[100,200]$ GeV.


title: Leptogenesis from Bilinear R-parity Violating Couplings

abstract:
  We reexamine the idea that bilinear R-parity violating couplings can be
responsible for leptogenesis. We prove that, to have lepton number violation
before the electroweak phase transition, misalignment between the
lepton-Higgsino and slepton-Higgs sectors must be involved. The processes that
generate a lepton asymmetry are bino or wino decays into a lepton-Higgs and
slepton-Higgsino final states. Since these decays occur mainly while the
gauginos are still in thermal equilibrium, they quantitatively fail to produce
the observed baryon asymmetry of the universe.


title: Photoproduction of Heavy Vector Mesons at the LHC

abstract:
  The strong electromagnetic fields associated with high energy protons and
nuclei may lead to exclusive photoproduction of vector mesons in proton-proton
and nucleus-nucleus collisions at the LHC. This paper will discuss the expected
cross sections and rapidity and transverse momentum distributions.


title: Neutrino masses and mixings with an S3 family permutation symmetry

abstract:
  Large neutrino mixing angles suggest that the Yukawa sector is invariant
under permutations of the fermion families. This S_{3} permutation symmetry is
broken at a large energy scale but much below the unification scale. Assuming
that the lepton mass matrix is approximately diagonal, all neutrino mixing
angles naturally come from the breaking of S_{3}-> S_{2}. In the neutrino
sector, S_{2} remains (approximately) unbroken. As a consequence, we have a
large atmospheric neutrino angle and U_{e3}=0. The S_{3} symmetry at the
unification scale can also explain the large solar mixing angle. We give an
explicit expression of the solar mixing angle in terms of the left-handed
neutrino masses. We observe that this family permutation symmetry comes very
naturally from a quantized theory of functionals [1], that is an extension of
quantum field theory.


title:
Non-thermal leptogenesis via direct inflaton decay without SU(2)(L)
  triplets

abstract:
  We present a non-thermal leptogenesis scenario following standard
supersymmetric hybrid inflation, in the case where light neutrinos acquire mass
via the usual seesaw mechanism and inflaton decay to heavy right-handed
neutrino superfields is kinematically disallowed, or the right-handed neutrinos
which can be decay products of the inflaton are unable to generate sufficient
baryon asymmetry via their subsequent decay. The primordial lepton asymmetry is
generated through the decay of the inflaton into light particles by the
interference of one-loop diagrams with exchange of different right-handed
neutrinos. The mechanism requires superpotential couplings explicitly violating
a U(1) R-symmetry and R-parity. We take into account the constraints from
neutrino masses and mixing and the preservation of the primordial asymmetry. We
consider two models, one without and one with SU(2)(R) gauge symmetry. We show
that the former is viable, whereas the latter is ruled out. Although the broken
R-parity need not have currently observable low-energy signatures, some
R-parity-violating slepton decays may be detectable in the future colliders.


title:
Generalization of the DGLAP for the structure function g_1 to the region
  of small x

abstract:
  The explicit expressions for the non-singlet and singlet components of the
DIS structure function g_1 comprising the DGLAP -expressions for the
coefficient functions and the anomalous dimensions, and accounting for the
total resummation of the most singular contributions to those are obtained.


title:
Exotic and nonexotic magnetic transitions in the context of the SELEX
  and GRAAL experiments

abstract:
  We calculate magnetic transition moments in the chiral quark-soliton model,
with explicit SU(3)-symmetry breaking taken into account. The dynamical model
parameters are fixed by experimental data for the magnetic moments of the
baryon octet and from the recent measurements of $\Theta^{+}$ mass. Known
magnetic transition moments $\mu_{\Lambda\Sigma}$, $\mu_{N\Delta}$ are
reproduced and predictions for other octet-decuplet and octet-antidecuplet
transitions are given. In particular $\mu_{\Sigma\Sigma^{\ast}}$ recently
constrained by SELEX is shown to be below $0.82 \mu_N$. The recent GRAAL data
on $\eta$ photoproduction off the nucleon are explained in terms of a new
narrow antidecuplet neutron-like resonance.


title: Masses of light mesons in the relativistic quark model

abstract:
  The masses of the S-wave mesons consisting of the light (u,d,s) quarks are
calculated within the constituent quark model. The relativistic
Schroedinger-like equation with a confining potential is numerically solved for
the complete relativistic q bar q potential including both spin-independent and
spin-dependent terms. The obtained masses of the ground-state pi, rho, K, K*
and phi mesons and their first radial excitations are in reasonably good
overall agreement with experimental data.


title:
Production of multiply heavy flavoured baryons from Quark Gluon Plasma
  in relativistic heavy ion collisions

abstract:
  It is argued that in heavy ion collisions at LHC there could be a sizeable
production of baryons containing two or three heavy quarks from statistical
coalescence. This production mechanism is peculiar of Quark Gluon Plasma and
the predicted rates, in heavy ion collisions at LHC energy, exceed those from a
purely hadronic scenario, particularly for Xi_bc and Omega_ccc. Thus, besides
the interest in the discovery of these new states, enhanced ratios of these
baryons over singly heavy flavoured hadrons, like B or D, in heavy ion
collisions with respect to pp at the same energy, would be a clear indication
of kinetic equilibration of heavy quarks in the Quark Gluon Plasma.


title: Nonperturbative renormalization for 2PI effective action techniques

abstract:
  Nonperturbative approximation schemes based on two-particle irreducible (2PI)
effective actions provide an important means for our current understanding of
(non-)equilibrium quantum field theory. A remarkable property is their
renormalizability, since these approximations involve selective summations to
infinite perturbative orders. In this paper we show how to renormalize all
$n$-point functions of the theory, which are given by derivatives of the
2PI-resummed effective action $\Gamma[\phi]$ for scalar fields $\phi$. This
provides a complete description in terms of the generating functional for
renormalized proper vertices, which extends previous prescriptions in the
literature on the renormalization for 2PI effective actions. The importance of
the 2PI-resummed generating functional for proper vertices stems from the fact
that the latter respect all symmetry properties of the theory and, in
particular, Goldstone's theorem in the phase with spontaneous symmetry
breaking. This is important in view of the application of these techniques to
gauge theories, where Ward identities play a crucial role.


title: CP violation in $K^{\pm}\to\pi^0\pi^0\pi^{\pm}$ decay

abstract:
  CP violation leads to a difference between the parameters $g^+$ and $g^-$
describing the energy distributions of the charged pions produced in the $K^+
\to\pi^0 \pi^0 \pi^+$ and $K^- \to \pi^0\pi^0 \pi^-$ decays. We study the
difference $(g^+ - g^-)$ as a function of the relative contributions from the
QCD-penguin and the electroweak-penguin diagrams. We find that the combination
of these contributions in $(g^+ - g^-)$ is very similar to the corresponding
one defining the parameter $\epsilon'$ in the $K_L \to 2\pi$ decays. This
observation allows a determination of the value of $(g^+ - g^-)$, using data on
$\epsilon'$.


title: Synthetic Running Coupling of QCD

abstract:
  Based on a study of the analytic running coupling obtained from the standard
perturbation theory results up to four-loop order, the QCD ``synthetic''
running coupling \alpha_{syn} is built. In so doing the perturbative time-like
discontinuity is preserved and nonperturbative contributions not only remove
the nonphysical singularities of the perturbation theory in the infrared region
but also decrease rapidly in the ultraviolet region. In the framework of the
approach, on the one hand, the running coupling is enhanced at zero and, on the
other hand, the dynamical gluon mass m_g arises. Fixing the parameter which
characterize the infrared enhancement corresponding to the string tension
\sigma and normalization, say, at M_\tau completely define the synthetic
running coupling. In this case the dynamical gluon mass appears to be fixed and
the higher loop stabilization property of m_g is observed. For \sigma = (0.42
GeV)^2 and \alpha_{syn}(M^2_\tau) = 0.33 \pm 0.01 it is obtained that m_g = 530
\pm 80 MeV.


title: Vacuum Decay on a Brane World

abstract:
  The bubble nucleation rate for a first order phase transition occurring on a
brane world is calculated. Both the Coleman-de Luccia thin wall instanton and
the Hawking-Moss instanton are considered. The results are compared with the
corresponding nucleation rates for standard four-dimensional gravity.


title: One-loop RGEs for two left-right SUSY models

abstract:
  In this paper we present the renormalization group equations to one-loop
order for all the parameters of two supersymmetric left-right theories that are
softly broken. Both models are based upon the gauge group SU(3)^c x SU(2)_L x
SU(2)_R x U(1)_{B - L} and both contain an arbitrary number of bidoublets as
well as singlets; however, one model uses doublets to break SU(2)_R and the
other uses triplets.


title: Symmetries and Ambiguities in the linear sigma model with light quarks

abstract:
  We investigate the role of undetermined finite contributions generated by
radiative corrections in a $SU(2)\times SU(2)$ linear sigma model with quarks.
Although some of such terms can be absorbed in the renormalization procedure,
one such contribution is left in the expression for the pion decay constant.
This arbitrariness is eliminated by chiral symmetry.


title: Implications of neutrino data circa 2005

abstract:
  Adopting the 3 neutrino framework, we present an updated determination of the
oscillation parameters. We perform a global analysis and develope simple
arguments that give essentially the same result. We also discuss determinations
of solar neutrino fluxes, capabilities of future experiments, tests of CPT,
implications for neutrino-less double-beta decay, beta decay, cosmology.


title: Electromagnetic Field Creation During EWPT Nucleation With MSSM

abstract:
  We derive the equations of motion for electroweak MSSM with a right-handed
Stop, from which we derive the equations for the electromagnetic field that
arises from bubble nucleation and collisions during the first order electroweak
phase transition that can occur in this MSSM. Introducing an isospin ansatz we
derive e.o.m. for the electrically charged W fields uncoupled from all other
fields. These serve as the current for the Maxwell-like e.o.m. for the em
field. The resulting electromagnetic field arising during EWPT bubble
nucleation is found. This electromagnetic structure, along with that arising
from bubble collisions, could seed galactic and extra-galactic magnetic fields.


title:
Requirements to Detect the Monoenergetic Photon Signature of Thermal
  Cold Dark Matter in PeV-Scale Split Supersymmetry

abstract:
  Split supersymmetry scenarios with PeV-scale scalar masses circumvent many of
the restrictions on supersymmetry coming from experimental limits on CP
violation, flavor-changing neutral currents, and the Higgs boson mass. We
consider the situation where the LSP is either a Wino or Higgsino and the
majority of its cold dark matter relic density is of thermal origin, in which
case its mass is specified to be 2.3 TeV for a Wino or 1.1 TeV for a Higgsino.
We examine the potential for indirect detection, at present and future
gamma-ray telescopes, of the monoenergetic photon lines that would result from
the annihilation of these particles near the galactic center. We show how the
possibility for detection depends on the precise form of the galactic
dark-matter halo profile and examine what performance attributes a gamma-ray
detector would need in order to register a 5-sigma discovery.


title:
Effect of $U_A(1)$ Breaking on Chiral Phase Structure and Pion
  Superfluidity at Finite Isospin Chemical Potential

abstract:
  We investigate the isospin chemical potential effect in the frame of SU(2)
Nambu-Jona-Lasinio model. When the isospin chemical potential is less than the
vacuum pion mass, the phase structure with two chiral phase transition lines
does not happen due to $U_A(1)$ breaking of QCD. When the isospin chemical
potential is larger than the vacuum pion mass, the ground state of the system
is a Bose-Einstein condensate of charged pions.


title: Phase Structure of Color Superconductivity

abstract:
  We investigate color superconductivity and chiral symmetry restoration at
finite temperature and baryon density in the frame of standard two flavor
Nambu--Jona-Lasinio model. We derive the diquark mass in RPA, discuss its
constraint on the coupling constant in the diquark channel, and find a strong
competition between the two phase transitions when the coupling constant is
large enough.


title: The energy dependence of the saturation scale in DIS at low x

abstract:
  Consistency of the previously suggested color-dipole representation of
deep-inelastic scattering (DIS_) and vector-meson production at low x with
DGLAP evolution allows one to predict the exponent of the W^2 dependence of the
saturation scale Lambda_sat^2(W^2) ~ (W^2)^C-2. One finds C_2^theory = 0.27 in
agreement with the model-independent analysis of the experimental data from
HERA on deep-inelastic electron scattering.


title:
Transverse Pressure and Strangeness Dynamics in Relativistic Heavy Ion
  Reactions

abstract:
  Transverse hadron spectra from proton-proton, proton-nucleus and
nucleus-nucleus collisions from 2 AGeV to 21.3 ATeV are investigated within two
independent transport approaches (HSD and UrQMD). For central Au+Au (Pb+Pb)
collisions at energies above $E_{\rm lab}\sim$ 5 AGeV, the measured $K^{\pm}$
transverse mass spectra have a larger inverse slope parameter than expected
from the default calculations. The additional pressure - as suggested by
lattice QCD calculations at finite quark chemical potential $\mu_q$ and
temperature $T$ - might be generated by strong interactions in the early
pre-hadronic/partonic phase of central Au+Au (Pb+Pb) collisions. This is
supported by a non-monotonic energy dependence of $v_2/< p_T>$ in the present
transport model.


title: Highly Excited Baryons in Large $N_c$ QCD

abstract:
  We use the $1/N_c$ expansion of QCD to analyse the spectrum of positive
parity resonances with strangeness $S = 0, -1, -2$ and -3 in the 2--3 GeV mass
region, supposed to belong to the $[\textbf{56},4^+]$ multiplet. The mass
operator is similar to that of $[\textbf{56},2^+]$, previously studied in the
literature. The analysis of the latter is revisited. In the $[\textbf{56},4^+]$
multiplet we find that the spin-spin term brings the dominant contribution and
that the spin-orbit term is entirely negligible in the hyperfine interaction,
in agreement with constituent quark model results. More data are strongly
desirable, especially in the strange sector in order to fully exploit the power
of this approach. We discuss possibilities of extending the calculations to
other excited baryons belonging to the N=2 or the N=4 band.


title: Study of multiparticle production by gluon dominance model (Part II)

abstract:
  The gluon dominance model presents a description of multiparticle production
in proton-proton collisions and proton-antiproton annihilation. The collective
behavior of secondary particles in $pp$-interactions at 70 GeV/c and higher is
studied in the project {\bf "Thermalization"}. The obtained neutral and charged
multiplicity distribution parameters explain some RHIC-data. The gluon
dominance model is modified by the inclusion of intermediate quark topology for
the multiplicity distribution description in the pure $p\bar p$-annihilation at
few tens GeV/c and explains behavior of the second correlative moment. This
article proposes a mechanism of the soft photon production as a sign of
hadronization. Excess of soft photons allows one to estimate the emission
region size.


title: Pseudo-Goldstones from Supersymmetric Wilson Lines on 5D Orbifolds

abstract:
  We consider a U(1) gauge theory on the five dimensional orbifold
$\mathcal{M}_4\times S^1/Z_2$, where $A_5$ has even $Z_2$ parity. This leads to
a light pseudoscalar degree of freedom $W(x)$ in the effective 4D theory below
the compactification scale arising from a gauge-invariant brane-to-brane Wilson
line. As noted by Arkani-Hamed et al in the non-supersymmetric $S^1$ case the
5D bulk gauge-invariance of the underlying theory together with the non-local
nature of the Wilson line field leads to the protection of the 4D theory of
$W(x)$ from possible large global-symmetry violating quantum gravitational
effects. We study the $S^1/Z_2$ theory in detail, in particular developing the
supersymmetric generalization of this construction, involving a pseudoscalar
Goldstone field (the `axion') and its scalar and fermion superpartners
(`saxion' and `axino'). The global nature of $W(x)$ implies the absence of
independent Kaluza-Klein excitations of its component fields. The
non-derivative interactions of the (supersymmetric) Wilson line in the
effective 4D theory arising from U(1) charged 5D fields $\Phi$ propagating
between the boundary branes are studied. We show that, similar to the
non-supersymmetric $S^1$ case, these interactions are suppressed by $\exp(-\pi
R m_{\Phi})$ where $\pi R$ is the size of the extra dimension.


title: Confinement-Deconfinement Phase Transition at Nonzero Chemical Potential

abstract:
  We present arguments suggesting that large size overlapping instantons are
the driving mechanism of the confinement-deconfinement phase transition at
nonzero chemical potential mu. The arguments are based on the picture that
instantons at very large chemical potential in the weak coupling regime are
localized configurations with finite size rho~1/mu. At the same time, the same
instantons at smaller chemical potential in the strong coupling regime are well
represented by the so-called instanton-quarks with fractional topological
charge 1/Nc. We estimate the critical chemical potential mu_c(T) where this
phase transition takes place as a function of temperature in the domain where
our approach is justified. In this picture, the long standing problem of the
"accidental" coincidence of the chiral and deconfinement phase transitions at
nonzero temperature (observed in lattice simulations) is naturally resolved. We
also derive results at nonzero isospin chemical potential mu_I where direct
lattice calculations are possible, and our predictions can be explicitly
tested.


title: Cosmological neutrino bounds for non-cosmologists

abstract:
  I briefly review cosmological bounds on neutrino masses and the underlying
gravitational physics at a level appropriate for readers outside the field of
cosmology. For the case of three massive neutrinos with standard model
freezeout, the current 95% upper limit on the sum of their masses is 0.42 eV. I
summarize the basic physical mechanism making matter clustering such a
sensitive probe of massive neutrinos. I discuss the prospects of doing still
better in coming years using tools such as lensing tomography, approaching a
sensitivity around 0.03 eV. Since the lower bound from atmospheric neutrino
oscillations is around 0.05 eV, upcoming cosmological measurements should
detect neutrino mass if the technical and fiscal challenges can be met.


title:
Analysis of U$_A$(1) symmetry-breaking and restoration effects on the
  scalar-pseudoscalar spectrum

abstract:
  We explore patterns of effective restoration of the chiral U$_A$(1) symmetry
using an extended three-flavor Nambu-Jona-Lasinio model that incorporates
explicitly the axial anomaly through the 't Hooft interaction, and assuming
that the coefficient of the anomaly term is temperature and density dependent.
The special case of explicit breaking of chiral symmetry without U$_A$(1)
anomaly is also considered, since this scenario can provide additional
information allowing to understand the interplay between the U$_A$(1) anomaly
and (spontaneous) chiral symmetry breaking effects. The pseudoscalar and scalar
sectors are analyzed in detail bearing in mind the identification of chiral
partners and the study of its convergence. We also concentrate on the behavior
of the mixing angles that give us relevant information on the issue under
discussion. In the region of temperatures (densities) studied, we do not
observe signs indicating a full restoration of U(3)$\otimes$U(3) symmetry as,
for instance, the degeneracy of both $a_0$ and $f_0$ mesons with the pion. As
we work in a real world scenario ($m_u=m_d<<m_s$), we only observe the return
to symmetries of the classical QCD Lagrangian in the non-strange sector.


title: New NLO Parametrizations of the Parton Distributions in Real Photons

abstract:
  We present new NLO sets of parton distributions in real photons based on a
scheme invariant definition of the non-perturbative input. We compare the
theoretical predictions with LEP data and a best fit allows us to constrain the
parameters of the distributions. The shape of the gluon distribution is poorly
constrained and we consider the possibility to measure it in photoproduction
experiments. Three parametrizations which aim to take into account the
scattering of LEP data are proposed. They are compared to other NLO
parametrizations.


title:
The littlest Higgs model and Higgs boson associated production with top
  quark pair at high energy linear $e^{+}e^{-}$ collider

abstract:
  In the parameter space allowed by the electroweak precision measurement data,
we consider the contributions of the new particles predicted by the littlest
Higgs($LH$) model to the Higgs boson associated production with top quark pair
in the future high energy linear $e^{+}e^{-}$ collider($ILC$). We find that the
contributions mainly come from the new gauge bosons $Z_{H}$ and $B_{H}$. For
reasonable values of the free parameters, the absolute value of the relative
correction parameter $\delta\sigma/\sigma^{SM}$ can be significanly large,
which might be observed in the future $ILC$ experiment with $\sqrt{S}=800GeV$.


title: The Discovery Potential of a Super B Factory

abstract:
  The Proceedings of the 2003 SLAC Workshops on flavor physics with a high
luminosity asymmetric e+e- collider. The sensitivity of flavor physics to
physics beyond the Standard Model is addressed in detail, in the context of the
improvement of experimental measurements and theoretical calculations.


title: Experimentally Probing the Shape of Extra Dimensions

abstract:
  In brane world scenarios in which only gravity can propagate in the extra
dimensions, effects on the gravitational force may be experimentally testable
if there are two or three large extra dimensions. The strength of the force at
distances smaller than the compactification radius will be sensitive to the
volume of the extra dimensions, but the determination of the shape requires
knowing the gravitational potential at intermediate scales. We determine the
dependence of the potential vs. distance as a function of both the relative
size of the extra dimensions and the possible angle between the extra
dimensional unit vectors, and show that high precision measurements of the
gravitational force will allow the determination of the shape of the extra
dimensions.


title: Factorization in B->V gamma Decays

abstract:
  The factorization properties of the radiative decays B->V gamma are analyzed
at leading order in 1/m_b using the soft-collinear effective theory. It is
shown that the decay amplitudes can be expressed in terms of a B->V form factor
evaluated at q^2=0, light-cone distribution amplitudes of the B and V mesons,
and calculable hard-scattering kernels. The renormalization-group equations in
the effective theory are solved to resum perturbative logarithms of the
different scales in the decay process. Phenomenological implications for the
B->K* gamma branching ratio, isospin asymmetry, and CP asymmetries are
discussed, with particular emphasis on possible effects from physics beyond the
Standard Model.


title: Study of $B\to \Lambda\bar\Lambda K$ and $B\to \Lambda\bar\Lambda \pi$

abstract:
  We study three-body charmless baryonic B decays of $B \to \Lambda\bar\Lambda
P$ with $P=\pi$ and $K$ in the standard model. We find that the branching
ratios of the $K$ modes are about one order of magnitude larger than those of
the corresponding $\pi$ modes unlike the cases of $B\to p\bar p P$. Explicitly,
we obtain that $Br(B^-\to \Lambda\bar \Lambda K^-)=(2.8\pm 0.2)\times 10^{-6}$
and $Br(\bar B^0 \to\Lambda\bar \Lambda \bar K^0)=(2.5\pm 0.3)\times 10^{-6}$.
The former agrees well with the BELLE experimental measurement of
$(2.91^{+0.90}_{-0.70}\pm 0.38)\times 10^{-6}$, while the latter should be seen
at the ongoing B factories soon.


title: Anomalous U(1) GUT

abstract:
  We have proposed a very attractive scenario of Grand Unified
  Theories (GUTs). It employs the supersymmetry (SUSY) and an anomalous U(1)
symmetry whose anomaly is canceled via the Green-Schwarz mechanism. In this
scenario, the doublet-triplet splitting problem is solved and the success of
the gauge coupling unification in the minimal SU(5) GUT is naturally explained
with sufficiently stable nucleon. Realistic fermion Yukawa matrices can also be
realized simultaneously. In addition, a horizontal symmetry helps to solve the
  SUSY-flavor problem.


title: Prospects of probing new physics in bottomonium decays and spectroscopy

abstract:
  A non-standard CP-odd Higgs boson could induce a slight (but observable)
lepton universality breaking in Upsilon leptonic decays. Moreover, mixing
between such a pseudoscalar Higgs boson and $\eta_b$ states might shift their
mass levels, thereby modifying the values of the
$M_{\Upsilon(nS)}-M_{\eta_b(nS)}$ hyperfine spplitings predicted in the
standard model. Besides, $\eta_b$ resonances could be broader than expected
with potentially negative consequences for discovery in both $e^+e^-$ and
hadron colliders. A scenario with a CP violating Higgs sector is also
considered. Finally, further strategies to search for a light Higgs particle in
bottomonium decays are outlined.


title: Primordial Black Holes, Hawking Radiation and the Early Universe

abstract:
  The 511 keV gamma emission from the galactic core may originate from a high
concentration ($\sim 10^{22}$) of primordial black holes (PBHs) in the core
each of whose Hawking radiation includes $\sim 10^{21}$ positrons per second.
The PBHs we consider are taken as near the lightest with longevity greater than
the age of the universe (mass $\sim 10^{12}$ kg; Schwarzschild radius $\sim 1$
fm). These PBHs contribute only a small fraction of cold dark matter,
$\Omega_{PBH} \sim 10^{-8}$. This speculative hypothesis, if confirmed implies
the simultaneous discovery of Hawking radiation and an early universe phase
transition.


title:
A Single Scalar Field Model of Dark Energy with Equation of State
  Crossing -1

abstract:
  In this paper we study the possibility of building models of dark energy with
equation of state across -1 and propose explicitly a model with a single scalar
field which gives rise to an equation of state larger than -1 in the past and
less than -1 at the present time, consistent with the current observations.


title: Generalized Parton Distributions and Transversity in Nucleons and Nuclei

abstract:
  We present an exploratory study using generalized parton distributions of
several observables related to transverse degrees of freedom in hadronic
structure -- the nucleon transverse momentum, the transverse radius, or impact
parameter, and the momentum transfer, $t$, dependence of the longitudinal
variable $x$ -- in both nucleons and nuclei.


title:
Dilepton production near partonic threshold in transversely polarized
  proton-antiproton collisions

abstract:
  It has recently been suggested that collisions of transversely polarized
protons and antiprotons at the GSI could be used to determine the nucleon's
transversity densities from measurements of the double-spin asymmetry for the
Drell-Yan process. We analyze the role of higher-order perturbative QCD
corrections in this kinematic regime, in terms of the available fixed-order
contributions as well as of all-order soft-gluon resummations. We find that the
combined perturbative corrections to the individual unpolarized and
transversely polarized cross sections are large. We trace these large
enhancements to soft gluon emission near partonic threshold, and we suggest
that with a physically-motivated cut-off enhancements beyond lowest order are
moderated relative to resummed perturbation theory, but still significant. The
unpolarized dilepton cross section for the GSI kinematics may therefore provide
information on the relation of perturbative and nonperturbative dynamics in
hadronic scattering. The spin asymmetry turns out to be rather robust,
relatively insensitive to higher orders, resummation, and the cut-offs.


title: Measuring the cosmological density perturbation

abstract:
  Precision measurements of anisotropies in the cosmic microwave background and
of the clustering of large-scale structure have supposedly confirmed that the
primordial density perturbation has a (nearly) scale-invariant spectrum.
However this conclusion is based on assumptions about the world model and the
nature of the dark matter. Physical models of inflation suggest that the
spectrum may not in fact be scale-free, which would imply rather different
cosmological parameters on the basis of the same observational data.


title: Pion Superfluidity and Meson Properties at Finite Isospin Density

abstract:
  We investigate pion superfluidity and its effect on meson properties and
equation of state at finite temperature and isospin and baryon densities in the
frame of standard flavor SU(2) NJL model. In mean field approximation to quarks
and random phase approximation to mesons, the critical isospin chemical
potential for pion superfluidity is exactly the pion mass in the vacuum, and
corresponding to the isospin symmetry spontaneous breaking, there is in the
pion superfluidity phase a Goldstone mode which is the linear combination of
the normal sigma and charged pion modes. We calculate numerically the gap
equations for the chiral and pion condensates, the phase diagrams, the meson
spectra, and the equation of state, and compare them with that obtained in
other effective models. The competitions between pion superfluidity and color
superconductivity at finite baryon density and between pion and kaon
superfluidity at finite strangeness density in flavor SU(3) NJL model are
briefly discussed.


title: Low lying axial-vector mesons as dynamically generated resonances

abstract:
  We make a theoretical study of the s-wave interaction of the nonet of vector
mesons with the octet of pseudoscalar mesons starting from a chiral invariant
Lagrangian and implementing unitarity in coupled channels. By looking for poles
in the unphysical Riemann sheets of the unitarized scattering amplitudes, we
get two octets and one singlet of axial-vector dynamically generated
resonances. The poles found can be associated to most of the low lying
axial-vector resonances quoted in the Particle Data Book: $b_1(1235)$,
$h_1(1170)$, $h_1(1380)$, $a_1(1260)$, $f_1(1285)$ and two poles to the
$K_1(1270)$ resonance. We evaluate the couplings of the resonances to the $VP$
states and the partial decay widths in order to reinforce the arguments in the
discussion.


title:
An NLO QCD analysis of inclusive cross-section and jet-production data
  from the ZEUS experiment

abstract:
  The ZEUS inclusive differential cross-section data from HERA, for charged and
neutral current processes taken with e+ and e- beams, together with
differential cross-section data on inclusive jet production in e+ p scattering
and dijet production in \gamma p scattering, have been used in a new NLO QCD
analysis to extract the parton distribution functions of the proton. The input
of jet data constrains the gluon and allows an accurate extraction of
\alpha_s(M_Z) at NLO;
  \alpha_s(M_Z) = 0.1183 \pm 0.0028(exp.) \pm 0.0008(model)
  An additional uncertainty from the choice of scales is estimated as \pm
0.005. This is the first extraction of \alpha_s(M_Z) from HERA data alone.


title:
Structure Function $F_L$ at Fixed $W$ in the $K_T$-Factorization
  Approach

abstract:
  The results for structure function $F_L$, obtained in the $k_T$-factorization
and collinear approaches, are compared with recent H1 experimental data at
fixed $W$ values.


title: Okubo-Zweig-Iizuka rule violation in photoproduction

abstract:
  We investigate OZI rule violation in omega and phi-meson photoproduction off
nucleons. Data on the total cross sections indicate a large phi/omega ratio of
about 0.8 at the maximal available photon energy that is in good agreement with
expectations from QCD. On the other hand, data at large four momentum transfer
exhibit a ratio of about 0.07, showing that the perturbative QCD regime is not
approached at |t| > 2 GeV^2 and photon energies E_\gamma < 4 GeV. The
anomanously large phi/omega ratio at low energies, that is close to the
reaction threshold, remains to be explained within nonperturbative QCD.


title:
Isospin breaking in pion-nucleon scattering at threshold by radiative
  processes

abstract:
  We investigate the dispersive contribution by radiative processes such as
(pi- proton to neutron gamma) and (pi- proton to Delta gamma) to the
pion-nucleon scattering lengths of charged pions in the heavy baryon limit.
They give a large isospin violating contribution in the corresponding isoscalar
scattering length, but only a small violation in the isovector one. These terms
contribute 6.3(3)% to the 1s level shift of pionic hydrogen and give a chiral
constant F_pi^2f_1=-25.8(8) MeV.


title: Volume Dependence of the Pion Mass from Renormalization Group Flows

abstract:
  We investigate finite volume effects on the pion mass and the pion decay
constant with renormalization group (RG) methods in the framework of a
phenomenological model for QCD. An understanding of such effects is important
in order to interpret results from lattice QCD and extrapolate reliably from
finite lattice volumes to infinite volume.
  We consider the quark-meson-model in a finite Euclidean 3+1 dimensional
volume. In order to break chiral symmetry in the finite volume, we introduce a
small current quark mass. In the corresponding effective potential for the
meson fields, the chiral O(4)-symmetry is broken explicitly, and the sigma and
pion fields are treated individually. Using the proper-time renormalization
group, we derive renormalization group flow equations in the finite volume and
solve these equations in the approximation of a constant expectation value.
  We calculate the volume dependence of pion mass and pion decay constant and
compare our results with recent results from chiral perturbation theory in
finite volume.


title: Aspects of cold dense quark matter

abstract:
  This thesis is devoted to properties of quark matter at high density and
(comparatively) low temperature, which might exist in the interior of compact
stars. The specific heat and the quark self energy in normal quark matter are
discussed in detail. In particular higher order corrections to the known
leading order results are obtained. Also the phenomenon of color
superconductivity is discussed, with particular emphasis on the proof of gauge
independence of the fermionic quasiparticle dispersion laws. Moreover, the
expectation value of the gluon field in the 2SC and CFL phase is computed at
leading order.


title: Simulating W/Z+jets production at the CERN LHC

abstract:
  The merging procedure of tree-level matrix elements and the subsequent parton
shower as implemented in the new event generator SHERPA will be validated for
the example of single gauge boson production at the LHC. The validation
includes consistency checks and comparisons to results obtained from other
event generators. In particular, comparisons with full next-to-leading order
QCD calculations prove SHERPA's ability to correctly account for additional
hard QCD radiation present in these processes.


title: Implementing the ME+PS merging algorithm

abstract:
  The method to merge matrix elements for multi particle production and parton
showers in electron-positron annihilations and hadronic collisions and its
implementation into the new event generator SHERPA is described in detail.
Examples highlighting different aspects of it are thoroughly discussed, some
results for various cases are presented. In addition, a way to extend this
method to general electroweak interactions is presented.


title:
Investigating the role of average color dipole size in BFKL Pomeron
  phenomenology

abstract:
  Based on the QCD dipole picture of the BFKL Pomeron, we investigate the role
played by the saturation scale, Q_{sat}, in obtaining physical values for the
affective strong coupling in phenomenological fits to small-x HERA data. The
dependence on this scale appears since the collection of color dipoles
characterizing the proton target have average size 1/Q_{sat}, which is energy
dependent. Physically, this means most of the color dipoles are above but
sufficiently close to the border between a saturated and the dilute system. The
analysis is first performed in the leading-logs BFKL approach in the
saddle-point approximation and it could shed light in further investigations
using resummed NLO BFKL kernels


title: Another possible way to determine the Neutrino Mass Hierarchy

abstract:
  We show that by combining high precision measurements of the atmospheric
delta m^2 in both the electron and muon neutrino (or anti-neutrino)
disappearance channels one can determine the neutrino mass hierarchy. The
required precision is a very challenging fraction of one per cent for both
measurements. At even higher precision, sensitivity to the cosine of the CP
violating phase is also possible. This method for determining the mass
hierarchy of the neutrino sector does not depend on matter effects.


title:
Exact solution for charged-particle propagation during a first-order
  electroweak phase transition with hypermagnetic fields

abstract:
  We obtain the exact solution of the Klein-Gordon equation describing the
propagation of a particle in two regions of different constant magnetic field,
separated by an infinite plane wall. The continuity of the wave function and of
its derivative at the interface is satisfied when including evanescent-wave
terms. We analyze solutions on truncated spaces and compare them with
previously obtained approximate solutions. The findings of this work have
applications in the problem of the propagation of particles in the presence of
a bubble wall in the midsts of an electroweak phase transition, where the two
regions separated by the wall are influenced by different (hyper)magnetic field
strengths.


title:
Bi-Large Neutrino Mixing See-Saw Mass Matrix with Texture Zeros and
  Leptogenesis

abstract:
  We study constraints on neutrino properties from texture zeros in bi-large
mixing See-Saw mass matrix and also from leptogenesis. Texture zeros may occur
in the light (class a)) or in the heavy (class b)) neutrino mass matrices. Each
of these two classes has 5 different forms which can produce non-trivial three
generation mixing with at least one texture zero. We find that two types of
texture zero mass matrices in both class a) and class b) can be consistent with
present data on neutrino masses, mixing and produce the observed baryon
asymmetry of the universe. None of the neutrinos can have zero masses with the
lightest of the light neutrinos having a mass larger than about 0.039 eV for
class a) and 0.002 eV for class b). In these models although CKM CP violating
phase vanishes, non-zero Majorana phases, however, can exist and play an
important role in producing the observed baryon asymmetry in our universe
through leptogenesis mechanism. The requirement of producing the observed
baryon asymmetry can further distinguish different models and also restrict the
See-Saw scale to be in the range $10^{12}\sim 10^{15}$ GeV.


title: Production and decay of gluino pairs at hadron colliders

abstract:
  At hadron colliders, one of the most important channels for sparticle
production is expected to be the gluino pair production. In the scenario where
the sbottom is lighter than the gluino, gluinos can decay into sbottom and
bottom quarks. Sbottoms can subsequently decay into bottom quarks and
neutralinos. Hence, one expects a rich signature consisting of four b-jets and
the missing transverse energy from neutralinos. To compute the cross section of
this reaction, it is important to find tools and techniques suitable for the
calculation of diagrams with many particles in the final state. We present here
a way to deal with such complicated reactions.


title: Equilibration in phi^4 theory in 3+1 dimensions

abstract:
  The process of equilibration in phi^4 theory is investigated for a
homogeneous system in 3+1 dimensions and a variety of out-of-equilibrium
initial conditions, both in the symmetric and broken phase, by means of the 2PI
effective action. Two Phi-derivable approximations including scattering effects
are used: the two-loop and the ``basketball'', the latter corresponding to the
truncation of the 2PI effective action at O(lambda^2). The approach to
equilibrium, as well as the kinetic and chemical equilibration is investigated.


title:
Color-spin locking phase in two-flavor quark matter for compact star
  phenomenology

abstract:
  We study a spin-1 single flavor color superconducting phase which results
from a color-spin locking (CSL) interaction in two-flavor quark matter. This
phase is particularly interesting for compact star cooling applications since
the CSL phase may survive under charge neutrality constraints implying a
mismatch between up- and down-quark chemical potentials which can destroy the
scalar diquark condensate. CSL gaps are evaluated within an NJL model and they
are found to be consistent with cooling phenomenology if a density dependent
coupling constant is used.


title: Spontaneous CP Symmetry Breaking in Top-condensation Models

abstract:
  In this thesis we study top-condensation models of electroweak symmetry
breaking. In particular we investigate a scenario in which the CP symmetry is
broken spontaneously due to the same condensates responsible of electroweak
symmetry breaking. In this way a CP violating CKM matrix, gauge boson masses,
and quark masses are dynamically generated. We started with a new four-fermion
interaction such that it can be rewritten using two auxiliary fields. These
fields become dynamical and play a similar role as the Higgs field in the SM
but being now composite.


title: The minimal U(1)' extension of the MSSM

abstract:
  Motivated by the apparent need for extending the MSSM and perhaps mitigating
naturalness problems associated with the $\mu$ parameter and fine-tuning of the
soft masses, we augment the MSSM spectrum by a SM gauge singlet chiral
superfield, and enlarge the gauge structure by an additional U(1)' invariance,
so that the gauge and Higgs sectors are relatively secluded. One crucial aspect
of U(1)' models is the existence of anomalies, cancellation of which may
require the inclusion of exotic matter which in turn disrupts the unification
of the gauge couplings. In this work we pursue the question of canceling the
anomalies with a minimal matter spectrum and no exotics. This can indeed be
realized provided that U(1)' charges are family-dependent and the soft-breaking
sector includes non-holomorphic operators for generating the fermion masses. We
provide the most general solutions for U(1)' charges by taking into account all
constraints from gauge invariance and anomaly cancellation. We analyze various
laboratory and astrophysical bounds ranging from fermion masses to relic
density, for an illustrative set of parameters. The U(1)' charges admit
patterns of values for which family nonuniversality resides solely in the
lepton sector, though this does not generate leptonic FCNCs due to the U(1)'
gauge invariance.


title:
Study of the angular coefficients and corresponding helicity cross
  sections of the W boson in hadron collisions

abstract:
  We present the Standard Model prediction for the eight angular coefficients
of the W boson, which completely describe its differential cross section in
hadron collisions. These coefficients are ratios of the W helicity cross
sections and the total unpolarized cross section. We also suggest a technique
to experimentally extract the coefficients.


title: Ultraperipheral Collisions

abstract:
  Ultraperipheral collisions at heavy ion colliders use the strong Coulomb
fields surrounding the ions to study photon-photon and photon-hadron processes
at high energy. A number of processes of interest are discussed here.


title: W+jets Matrix Elements and the Dipole Cascade

abstract:
  We extend the algorithm for matching fixed-order tree-level matrix element
generators with the Dipole Cascade Model in Ariadne to apply to processes with
incoming hadrons. We test the algoritm on for the process W+n jets at the
Tevatron, and find that the results are fairly insensitive to the cutoff used
to regularize the soft and collinear divergencies in the tree-level matrix
elements. We also investigate a few observables to check the sensitivity to the
matrix element correction.


title:
Electroweak properties of the $\pi$, $K$ and $K^*(892)$ in the three
  forms of relativistic kinematics

abstract:
  The electromagnetic form factors, charge radii and decay constants of pion, K
and K*(892) are calculated using the three forms of relativistic kinematics:
instant form, point form and (light) front form. Simple representations of the
mass operator together with single quark currents are employed with all the
forms. Making use of previously fixed parameters, together with the constituent
quark mass for the strange quark, a reasonable reproduction of the available
data for form factors, charge radii and decay constants of pion, rho, K and
K*(892) is obtained in front form. With instant form a similar description, but
with a systematic underestimation of the vector meson decay constants is
obtained using two different sets of parameters, one for pion and rho and
another one for K and K*(892). Point form produces a poor description of the
data.


title: Higgs-boson production at the Photon Collider at TESLA

abstract:
  In this thesis feasibility of the precise measurement of the Higgs-boson
production cross section gamma+gamma->higgs->b+bbar at the Photon Collider at
TESLA is studied in detail.
  The study is based on the realistic luminosity spectra simulation. The heavy
quark background is estimated using the dedicated code based on NLO QCD
calculations. Other background processes, which were neglected in the earlier
analyses, are also studied. Also the contribution from the overlaying events,
gamma+gamma->hadrons, is taken into account. The non-zero beam crossing angle
and the finite size of colliding bunches are included in the event generation.
The analysis is based on the full detector simulation with realistic b-tagging,
and the criteria of event selection are optimized separately for each
considered Higgs-boson mass.
  For the Standard-Model Higgs boson with mass of 120 to 160 GeV the partial
width \Gamma(h->gamma+gamma)BR(h->b+bbar) can be measured with a statistical
accuracy of 2.1-7.7% after one year of the Photon Collider running. The
systematic uncertainties of the measurement are estimated to be of the order of
2%.
  For MSSM Higgs bosons A and H, for M_A=200-350 GeV and tan(beta)=7, the
statistical precision of the cross-section measurement is estimated to be
8--34%, for four considered MSSM parameters sets. As heavy neutral Higgs bosons
in this scenario may not be discovered at LHC or at the first stage of the e+e-
collider, an opportunity of being a discovery machine is also studied for the
Photon Collider.


title: The Spin Structure of the Constituent Quarks and of the Nucleon

abstract:
  We define a constituent quark within QCD. It is shown that the spin of such a
quark and hence also the spin of the nucleon reduced due to $\bar{q}q$-pairs,
in agreement with experiment. A solution to the spin problem is given.


title:
Analysis the $0^{++}$ nonet mesons as four-quark states with the QCD sum
  rules

abstract:
  In this article, we take the point of view that the $0^{++}$ nonet mesons
below $1 GeV$ are diquark-antidiquark states
$(qq)_{\bar{3}}(\bar{q}\bar{q})_3$, and devote to determine their masses in the
framework of the QCD sum rules approach with the interpolating currents
constructed from scalar-scalar type and pseudoscalar-pseudoscalar type diquark
pairs respectively. The numerical results indicate that the $0^{++}$ nonet
mesons may have two possible diquark-antidiquark substructures.


title:
Gauge Independence and Chiral Symmetry Breaking in a Strong Magnetic
  Field

abstract:
  The gauge independence of the dynamical fermion mass generated through chiral
symmetry breaking in QED in a strong, constant external magnetic field is
critically examined. We present a (first, to the best of our knowledge)
consistent truncation of the Schwinger-Dyson equations in the lowest Landau
level approximation. We demonstrate that the dynamical fermion mass, obtained
as the solution of the truncated Schwinger-Dyson equations evaluated on the
fermion mass shell, is manifestly gauge independent.

categories: hep-ph astro-ph cond-mat.mes-hall hep-th nucl-th


title:
Direct, Indirect and Collider Detection of Neutralino Dark Matter In
  SUSY Models with Non-universal Higgs Masses

abstract:
  In supersymmetric models with gravity-mediated SUSY breaking, universality of
soft SUSY breaking sfermion masses m_0 is motivated by the need to suppress
unwanted flavor changing processes. The same motivation, however, does not
apply to soft breaking Higgs masses, which may in general have independent
masses from matter scalars at the GUT scale. We explore phenomenological
implications of both the one-parameter and two-parameter non-universal Higgs
mass models (NUHM1 and NUHM2), and examine the parameter ranges compatible with
Omega_CDM h^2, BF(b --> s,gamma) and (g-2)_mu constraints. In contrast to the
mSUGRA model, in both NUHM1 and NUHM2 models, the dark matter A-annihilation
funnel can be reached at low values of tan(beta), while the higgsino dark
matter annihilation regions can be reached for low values of m_0. We show that
there may be observable rates for indirect and direct detection of neutralino
cold dark matter in phenomenologically aceptable ranges of parameter space. We
also examine implications of the NUHM models for the Fermilab Tevatron, the
CERN LHC and a Sqrt(s)=0.5-1 TeV e+e- linear collider. Novel possibilities
include: very light s-top_R, s-charm_R squark and slepton_L masses as well as
light charginos and neutralinos and H, A and H^+/- Higgs bosons.


title:
Conformal invariant equations for nucleus-nucleus scattering in
  perturbative QCD with $N_c\to\infty$

abstract:
  In the perturbative QCD with $N_c\to\infty$ the amplitude for the collision
of two heavy nuclei is expressed via dipole densities in the nuclei. Coupled
equations for these densities are derived in the configuration space. The
equations are conformal invariant in absence of external sources. Passing to
conformal basis and its possible truncation are discussed.


title: NLO photon parton parametrization using ee and ep data

abstract:
  An NLO photon parton parametrization is presented based on the existing
$F_2^\gamma$ measurements from $e^+e^-$ data and the low-$x$ proton structure
function from $ep$ interactions. Also included in the extraction of the NLO
parton distribution functions are the dijets data coming from $\gamma p \to j_1
+ j_2 +X$. The new parametrization is compared to other NLO parametrizations.


title: Domain Formation: Decided Before, or After the Transition?

abstract:
  There is increasing evidence that causality provides useful bounds in
determining the domain structure after a continuous transition. In devising
their scaling laws for domain size after such a transition, Zurek and Kibble
presented arguments in which causality is important both before and after the
time at which the transition begins to be implemented. Using numerical
simulations of kinks in 1+1 dimensions, we explain how the domain structure is
determined exclusively by what happens after the transition, even though the
correlation length freezes in before the transition.


title: Shape Functions from B -> X_c \ell \nu

abstract:
  We study inclusive semi-leptonic (B -> X_c \ell \nu) decay using the power
counting m_c ~ \sqrt{Lambda_{QCD} m_b}. Assuming this scaling for the
charm-quark mass, the decay kinematics can be chosen to access the
shape-function region even in b -> c transitions. To apply effective field
theory methods in this region we extend SCET to describe massive collinear
quarks. We calculate the tree-level decay rate, including O(Lambda_{QCD}/m_b)
power corrections, and show that it factorizes into a convolution of jet and
shape functions. We identify a certain kinematical variable whose decay
spectrum is proportional to the universal leading-order shape function familiar
from b -> u decay, and speculate as to whether information about this shape
function can be extracted from data on b -> c decay.


title: The process gg -> WW as a background to the Higgs signal at the LHC

abstract:
  The production of W pairs from the one-loop gluon fusion process is studied.
Formulas are presented for the helicity amplitudes keeping the top mass finite,
but all other quark masses zero. The correlations among the leptons coming from
the W bosons are kept. The contribution of this background to the Higgs boson
search in the WW decay mode at the LHC is estimated by applying the cuts
foreseen in experimental searches using the PYTHIA Monte Carlo program.
Kinematic distributions for the final state leptons are compared to those of
the Higgs boson signal and of the q qbar -> WW background. After applying final
cuts, the gg background is found to be large, at the level of 35% of the q qbar
background.The characteristics of the gg background are very similar to those
of the signal. Therefore, an experimental normalization of this background
component appears to be very difficult and the uncertainty must largely be
determined by theory. As a result, the significance of a Higgs signal in the gg
-> H -> WW mode at the LHC is reduced.


title: Quark-Lepton Complementarity in Unified Theories

abstract:
  As pointed out by many authors, recent observations are consistent with an
intriguing relation between the Cabibbo angle $\theta_C$ and the solar neutrino
mixing angle $\theta_{12}$, namely $\theta_{12} \simeq \pi/4 - \theta_C$. Such
quark-lepton complementarity (QLC) may be a signal of an underlying
quark-lepton unification at short distances. We discuss possible ways to
realize this relation in realistic quark-lepton unification theories by
identifying a minimal set of operators that lead to QLC while remaining
consistent with other known data. The purpose of this paper is to present the
first elements of a unified model at the GUT scale capable of predicting the
QLC relation. A generic prediction of our proposed class of models is the new
relation for the lepton mixing angle $\theta_{13} \simeq \theta_C$, which
allows these models to be confirmed or excluded by the current generation of
neutrino oscillation experiments.


title: Deep inelastic scattering and forward neutral pion production at NLO

abstract:
  We present a detailed phenomenological study of forward hadron neutral pion
production in deep inelastic scattering, with both the direct and the resolved
contributions calculated to NLO accuracy. A comparison of the theoretical
predictions for the various distributions with the H1 data and a study of
stability of the QCD predictions under changes of scales is the focus of this
study. We obtain a very good overall description of the recent H1 data with the
choice of scale Q^2 + E^2_{perp}, in contrast to the (Q^2 + E^2_{perp})/2
required earlier when the resolved contribution was included only at LO
accuracy. We find a more modest variation of the predictions, as the scale is
changed from (Q^2 + E^2_{perp})/2 to 2(Q^2 + E^2_{perp}), as compared to the
case where the resolved contribution was included only at LO accuracy. This
variation is of the order of the rather large experimental errors.
Unfortunately, this fact prevents us from concluding that perturbation theory
gives an unambiguous prediction for forward particle production in deep
inelastic scattering. However, the overall success of perturbative QCD in
explaining the small x_{Bj} data means that perhaps a full resummation of the
BFKL ladder is not called for. We notice the need for rather large resolved
contributions to explain the data at low x_{Bj} even at somewhat larger Q^2
values.


title: PHASE, a Monte Carlo event generator for six-fermion physics at the LHC

abstract:
  PHASE is a new event generator dedicated to the study of Standard Model
processes with six fermions in the final state at the LHC. The code is intended
for analyses of vector boson scattering, Higgs search, three gauge boson
production, and top physics. This first version of the program describes final
states characterized by the presence of one neutrino, $pp\to 4q +l\nu_l$, at
O($\alpha^6$). PHASE is based on a new iterative-adaptive multichannel
technique, and employs exact leading order matrix elements. The code can
generate unweighted events for any subset of all available final states. The
produced parton-level events carry full information on their colour and flavour
structure, enabling the evolution of the partons into fully hadronised final
states. An interface to hadronization packages is provided via the Les Houches
Protocol.


title: Compatibility of DAMA Dark Matter Detection with Other Searches

abstract:
  We present two examples of velocity distributions for light dark matter
particles that reconcile the annual modulation signal observed by DAMA with all
other negative results from dark matter searches. They are: (1) a conventional
Maxwellian distribution for particle masses around 5 to 9 GeV; (2) a dark
matter stream coming from the general direction of Galactic rotation (not the
Sagittarius stream). Our idea is based on attributing the DAMA signal to
scattering off Na, instead of I, and can be tested in the immediate future by
detectors using light nuclei, such as CDMS-II (using Si) and CRESST-II (using
O).


title: Hagedorn Thermostat: A Novel View of Hadronic Thermodynamics

abstract:
  A microcanonical treatment of Hagedorn systems, i.e. finite mass hadronic
resonances with an exponential mass spectrum controlled by the Hagedorn
temperature $T_H$, is performed. We show that, in the absence of any
restrictions, a Hagedorn system is a perfect thermostat, i.e. it imparts its
temperature $T_H$ to any other system in thermal contact with it. We study the
thermodynamic effects of the lower mass cut-off in the Hagedorn mass spectrum.
We show that in the presence of a single Hagedorn resonance the temperature of
any number of $N_B$ Boltzmann particles differs only slightly from $T_H$ up to
the kinematically allowed limit $N_B^{kin}$. For $N_B > N_B^{kin}$ however, the
low mass cut-off leads to a decrease of the temperature as $N_B$ grows. The
properties of Hagedorn thermostats naturally explain a single value of
hadronization temperature observed in elementary particle collisions at high
energies and lead to some experimental predictions.


title: A comment on the lepton mixing matrix

abstract:
  A recent parameterisation scheme developed for the quark mixing matrix is
shown to be easily applicable to the lepton mixing matrix as well.


title:
The radiative lepton flavor violating decays in the split fermion
  scenario in the two Higgs doublet model

abstract:
  We study the branching ratios of the lepton flavor violating processes \mu ->
e \gamma, \tau -> e \gamma and \tau -> \mu\gamma in the split fermion scenario,
in the framework of the two Higgs doublet model. We observe that the branching
ratios are relatively more sensitive to the compactification scale and the
Gaussian widths of the leptons in the extra dimensions, for two extra
dimensions and especially for the \tau -> \mu \gamma decay.


title:
Comparison of the color-evaporation model and the NRQCD factorization
  approach in charmonium production

abstract:
  We compare the color-evaporation model (CEM) and nonrelativistic QCD (NRQCD)
factorization predictions for inclusive quarkonium production. Using the NRQCD
factorization formulas for quarkonium production and for perturbative QQ-bar
production, we deduce relationships that are implied by the CEM between the
nonperturbative NRQCD matrix elements that appear in the factorization formula
for quarkonium production. These relationships are at odds with the
phenomenological values of the matrix elements that have been extracted from
the Tevatron data for charmonium production at large transverse momentum. A
direct comparison of the CEM and NRQCD factorization predictions with the CDF
charmonium production data reveals that the CEM fits to the data are generally
unsatisfactory, while the NRQCD factorization fits are generally compatible
with the data. The inclusion of k_T smearing improves the CEM fits
substantially, but significant incompatibilities remain. The NRQCD
factorization fits to the chi_c data indicate that multiple gluon radiation is
an essential ingredient in obtaining the correct shape of the cross section as
a function of p_T.


title:
Super-NOvA: a long-baseline neutrino experiment with two off-axis
  detectors

abstract:
  Establishing the neutrino mass hierarchy is one of the fundamental questions
that will have to be addressed in the next future. Its determination could be
obtained with long-baseline experiments but typically suffers from degeneracies
with other neutrino parameters. We consider here the NOvA experiment
configuration and propose to place a second off-axis detector, with a shorter
baseline, such that, by exploiting matter effects, the type of neutrino mass
hierarchy could be determined with only the neutrino run. We show that the
determination of this parameter is free of degeneracies, provided the ratio
L/E, where L the baseline and E is the neutrino energy, is the same for both
detectors.


title:
Bounds on the slope and the curvature of the scalar K\pi form factor at
  zero momentum transfer

abstract:
  We derive and calculate unitarity bounds on the slope and curvature of the
strangeness-changing scalar form factor at zero momentum transfer, using
low-energy constraints and Watson final state interaction theorem. The results
indicate that the curvature is important and should not be neglected in the
representation of experimental data. The bounds can be converted also into an
allowed region for the constants $C\_{12}^r$ and $C\_{34}^r$ of Chiral
Perturbation Theory. Our results are consistent with, but weaker than the
predictions made by Jamin, Oller and Pich in a coupled channel dispersion
approach basedon chiral resonance model. We comment on the differences between
the two dispersive methods and argue that the unitarity bounds are useful as an
independent check involving different sources of information


title:
BCVEGPY2.0: A upgrade version of the generator BCVEGPY with an addendum
  about hadroproduction of the $P$-wave $B_c$ states

abstract:
  The generator BCVEGPY is upgraded by adding the hadroproduction of the
$P$-wave excited $B_c$ states (denoted by $B_{cJ,L=1}^*$ or by $h_{B_c}$ and
$\chi_{B_c}$) and by improving some features of the original one as well. We
denote it as BCVEGPY2.0. The $P$-wave production is also calculated by taking
only the dominant gluon-gluon fusion mechanism (with the subprocess $gg\to
B_{cJ,L=1}^*+\bar{c}+b$ being dominated) into account as that for $S$-wave. In
order to make the addendum piece of the upgraded generator as compact as
possible so as to increase its efficiency, we manipulate the amplitude as
compact as possible with FDC (a software for generating Feynman diagrams and
the algebra amplitudes, and for manipulating algebra formulae analytically etc)
and certain simplification techniques. The correctness of the program is tested
by checking the gauge invariance of the amplitude and by comparing the
numerical results with the existent ones in the literature carefully.


title: Lepton Mixing Matrix in Standard Model Extended by One Sterile Neutrino

abstract:
  We consider the simplest extension of the standard electroweak model by one
sterile neutrino that allows for neutrino masses and mixing. We find that its
leptonic sector contains much less free physical parameters than previously
realized. In addition to the two neutrino masses, the lepton mixing matrix in
charged current interactions involves (n-1) free physical mixing angles for n
generations. The mixing matrix in neutral current interactions of neutrinos is
completely fixed by the two masses. Both interactions conserve CP. We
illustrate the phenomenological implications of the model by vacuum neutrino
oscillations, tritium beta decay and neutrinoless double beta decay. It turns
out that, due to the revealed specific structure in its mixing matrix, the
model with any n generations cannot accommodate simultaneously the data by
KamLAND, K2K and CHOOZ.


title: The High-Temperature Phase of Landau-Gauge Yang-Mills Theory

abstract:
  The properties of the high-temperature phase of Yang-Mills theory in Landau
gauge are investigated by extending an earlier study on the
infinite-temperature limit to finite temperatures. To this end the
Dyson-Schwinger equations for the propagators of the gluon and the
Faddeev-Popov ghost are solved analytically in the infrared and numerically at
non-vanishing momenta. Gluons, polarized transversely with respect to the heat
bath are found to comply with the Gribov-Zwanziger and the Kugo-Ojima scenario,
while longitudinally polarized gluons are screened. Therefore the
high-temperature phase is strongly interacting. It is furthermore conjectured
that Yang-Mills theory undergoes a first-order phase transition. Indications
are found that at high temperatures the thermodynamic properties are nearly
those of an ideal gas, although long-range interactions prevail.


title: Nonfactorizable contributions to $B$ meson decays into charmonia

abstract:
  We analyze the $B\to (J/\psi, \chi_{c0},\chi_{c1},\eta_c)K^{(*)}$ decays,
which have small or even vanishing branching ratios in naive factorization
assumption (FA). We calculate nonfactorizable corrections to FA in the
perturbative QCD approach based on $k_T$ factorization theorem. The charmonium
distribution amplitudes are inferred from the non-relativistic heavy quarkonium
wave functions. It is found that the nonfactorizable contributions enhance the
branching ratios and generate the relative phases among helicity amplitudes of
the above modes. Most of the observed branching ratios, polarization fractions,
and relative phases, except those of $B\to\eta_c K$, are explained. Our
predictions for the $B\to (\chi_{c0},\chi_{c1},\eta_c)K^*$ decays can be
compared with future data.


title:
Natural gravitino dark matter in SO(10) gauge mediated supersymmetry
  breaking

abstract:
  It is shown that gravitinos with mass m_{3/2} ~ 0.1-1 MeV may provide
suitable cold dark matter candidates in scenarios of gauge mediated
supersymmetry breaking (GMSB) under SO(10) grand unification coupled to
supergravity, which accommodate a messenger sector of mass scale M_X ~ 10^6
GeV. This is due to the combined effects of renormalizable loop-suppressed
operators and generic non-renormalizable ones governing the dilution of a
pre-existing equilibrium gravitino abundance via messenger decay. The above
range of gravitino and messenger masses can be accommodated in indirect GMSB
scenarios. The gravitino abundance does not depend on the post-inflationary
reheat temperature and it is shown that leptogenesis can generate successfully
the baryon asymmetry.


title: Search for Higher Flavor Multiplets in Partial Wave Analyses

abstract:
  The possible existence of higher multi-quark flavor multiplets of baryons is
investigated. We argue that the S-matrix should have poles with any quantum
numbers, including those which are exotic. This argument provides a novel
justification for the existence of hadrons with arbitrary exotic structure.
Though it does not constitute a proof, there are still no theoretical arguments
against exotics. We then consider KN and piN scattering. Conventional and
modified partial-wave analyses provide several sets of candidates for
correlated pairs (Theta1, Delta), each of which could label a related 27-plet.
Properties of the pairs (masses, mass orderings, spin-parity quantum numbers)
do not quite correspond to the current theoretical expectations. Decay widths
of the candidates are either wider or narrower than expected. Possible reasons
for such disagreements are briefly discussed.


title:
Weak-coupling techniques for the thermodynamics of the quark-gluon
  plasma

abstract:
  We describe some of the recent progress in the calculation of thermodynamic
quantities in QCD at high temperatures and densities by weak-coupling
techniques and extrapolation to realistic coupling strength. We argue that a
(mostly) weakly coupled quark-gluon plasma at temperatures only a few times the
transition temperature is not yet ruled out by the observed fast apparent
thermalization at RHIC, as nonabelian plasma instabilities might provide an
efficient mechanism for fast isotropization even in a collisionless plasma.


title:
Phenomenology of B -> pi pi, pi K Decays at O(alpha^2 beta_0) in QCD
  Factorization

abstract:
  We study O(alpha^2 beta_0) perturbative corrections to matrix elements
entering two-body exclusive decays of the form B -> pi pi, pi K in the QCD
factorization formalism, including chirally enhanced power corrections, and
discuss the effect of these corrections on direct CP asymmetries, which receive
their first contribution at O(alpha). We find that the O(alpha^2 beta_0)
corrections are often as large as the O(alpha) corrections. We find large
uncertainties due to renormalization scale dependence as well as poor knowledge
of the non-perturbative parameters. We assess the effect of the perturbative
corrections on the direct CP violation parameters of B -> pi^+ pi^-.


title: Exclusive Dijet production from CDF2LHC

abstract:
  Exclusive dijet production at the Tevatron can be used as a benchmark to
establish predictions on exclusive diffractive Higgs production, a process with
a much smaller cross section. Exclusive dijet production in Double Pomeron
Exchange processes, including diffractive Higgs production with measurements at
the Tevatron and predictions for the Large Hadron Collider are presented. Using
new data from the Tevatron and dedicated diffractive triggers, no excess over a
smooth falling distribution for exclusive dijet events could be found. Upper
limits on the exclusive dijet production cross section are presented and
compared to current theoretical predictions.


title:
Resolving Neutrino Mass Hierarchy and CP Degeneracy by Two Identical
  Detectors with Different Baselines

abstract:
  We explore the possibility of simultaneous determination of neutrino mass
hierarchy and the CP violating phase by using two identical detectors placed at
different baseline distances. We focus on a possible experimental setup using
neutrino beam from J-PARC facility in Japan with beam power of 4MW and megaton
(Mton)-class water Cherenkov detectors, one placed in Kamioka and the other at
somewhere in Korea. We demonstrate, under reasonable assumptions of systematic
uncertainties, that the two-detector complex with each fiducial volume of 0.27
Mton has potential of resolving neutrino mass hierarchy up to sin^2 2theta_{13}
> 0.03 (0.055) at 2\sigma (3\sigma) CL for any values of delta and at the same
time has the sensitivity to CP violation by 4 + 4 years running of nu_e and
nu_e-bar appearance measurement. The significantly enhanced sensitivity is due
to clean detection of modulation of neutrino energy spectrum, which is enabled
by cancellation of systematic uncertainties between two identical detectors
which receive the neutrino beam with the same energy spectrum in the absence of
oscillations.


title:
Nuclear Medium Modifications of Hadrons from Generalized Parton
  Distributions

abstract:
  We study the structure of generalized parton distributions in spin 0 nuclei
within a microscopic approach for nuclear dynamics. GPDs can be used on one
side as tools to unravel the deep inelastic transverse structure of nuclei in
terms of both transverse spatial and transverse momentum degrees of freedom. On
the other, one can obtain information on GPDs themselves by observing how they
become modified in the nuclear environment. We derive the structure of the
nuclear deeply virtual Compton scattering tensor and generalized parton
distributions at leading order in $Q$ in a field-theoretical framework. The
nuclear generalized parton distributions are calculated using a two step
process -- the convolution approach -- where the scattering process happens
from a quark inside a nucleon, itself inside a nucleus, disregarding final
state interactions with both the nuclear and nucleon debris. We point out that
details of the nuclear long range interactions such as two-body currents, can
be disregarded compared to the deep inelastic induced modifications of the
bound GPDs. We show how the pattern of nuclear modifications predicted, and in
particular the deviations of off-shell effects from the longitudinal
convolution provide clear signals to be sought in experimental measurements.
Finally, we find interesting relationships by studying Mellin moments in
nuclei: in particular we predict the $A$-dependence for the $D$-term of GPDs
within a microscopic approach, and the behavior with $t$ of the total momentum
carried by quarks in a nucleus. The latter provides an important element for
the evaluation of nuclear hadronization phenomena which are vital for
interpreting current and future data at RHIC, HERMES and Jefferson Lab.


title: Binding of eta_c meson with light nucleus

abstract:
  Binding energy of eta_c with ^4 He has been calculated on the basis of Yukawa
type potential. Final Rank Approximation (FRA) has been used for microscopical
treatment of the initial 5-body problem. The results are compared with the
results of the folding model and variational calculations.


title:
The renormalized and Renormalization-Group invariant Hartree-Fock
  approximation

abstract:
  We study the renormalization problem for the Hartree--Fock approximation of
the $O(N)-$invariant $\phi^4$ model in the symmetric phase and show how to
systematically improve the corresponding diagrammatic resummation to achieve
the correct renormalization properties of the effective field equations,
including Renormalization--Group invariance with the one--loop beta function.
These new Hartree--Fock dynamics is still of mean field type but includes
memory effects which are generically nonlocal also in space.


title: Unraveling hadron structure with generalized parton distributions

abstract:
  The generalized parton distributions, introduced nearly a decade ago, have
emerged as a universal tool to describe hadrons in terms of quark and gluonic
degrees of freedom. They combine the features of form factors, parton densities
and distribution amplitudes--the functions used for a long time in studies of
hadronic structure. Generalized parton distributions are analogous to the
phase-space Wigner quasi-probability function of non-relativistic quantum
mechanics which encodes full information on a quantum-mechanical system. We
give an extensive review of main achievements in the development of this
formalism. We discuss physical interpretation and basic properties of
generalized parton distributions, their modeling and QCD evolution in the
leading and next-to-leading orders. We describe how these functions enter a
wide class of exclusive reactions, such as electro- and photo-production of
photons, lepton pairs, or mesons. The theory of these processes requires and
implies full control over diverse corrections and thus we outline the progress
in handling higher-order and higher-twist effects. We catalogue corresponding
results and present diverse techniques for their derivations. Subsequently, we
address observables that are sensitive to different characteristics of the
nucleon structure in terms of generalized parton distributions. The ultimate
goal of the GPD approach is to provide a three-dimensional spatial picture of
the nucleon, direct measurement of the quark orbital angular momentum, and
various inter- and multi-parton correlations.


title: On the mixed spin-scalar coupling approach in dark matter search

abstract:
  To avoid misleading discrepancies between results of different dark matter
search experiments as well as between the data and SUSY calculations it is in
general preferable to use a mixed spin-scalar coupling approach in which
spin-independent and spin-dependent WIMP-nucleon couplings are both non-zero.
On the other hand one may, however, to safely neglect the subdominant spin
WIMP-nucleon contribution in comparison with the spin-independent one in
analysis of data from experiments with heavy enough non-zero-spin target
nuclei. The mixed coupling approach is applied to estimate future prospects of
experiments with the odd-neutron high-spin isotope Ge-73.


title: Studying W+W- production at the Fermilab Tevatron with SHERPA

abstract:
  The merging procedure of tree-level matrix elements with the subsequent
parton shower as implemented in SHERPA will be studied for the example of W
boson pair production at the Fermilab Tevatron. Comparisons with fixed order
calculations at leading and next-to-leading order in the strong coupling
constant and with other Monte Carlo simulations validate once more the impact
and the quality of the merging algorithm and its implementation.


title: Scalar meson and glueball decays within a effective chiral approach

abstract:
  We study the strong and electromagnetic decay properties of scalar mesons
above 1 GeV within a chiral approach. The scalar-isoscalar states are treated
as mixed states of quarkonia and glueball configurations. A fit to the
experimental decay rates listed by the Particle Data group is performed to
extract phenomenological constraints on the nature of the scalar resonances. A
comparison to other theoretical approaches in the scalar meson sector is
discussed.


title: Splitting The Gluon?

abstract:
  In the strongly correlated environment of high-temperature cuprate
superconductors, the spin and charge degrees of freedom of an electron seem to
separate from each other. A similar phenomenon may be present in the strong
coupling phase of Yang-Mills theories, where a separation between the color
charge and the spin of a gluon could play a role in a mass gap formation. Here
we study the phase structure of a decomposed SU(2) Yang-Mills theory in a mean
field approximation, by inspecting quantum fluctuations in the condensate which
is formed by the color charge component of the gluon field. Our results suggest
that the decomposed theory has an involved phase structure. In particular,
there appears to be a phase which is quite reminiscent of the superconducting
phase in cuprates. We also find evidence that this phase is separated from the
asymptotically free theory by an intermediate pseudogap phase.


title: Generalized Boltzmann formalism for oscillating neutrinos

abstract:
  In the standard approaches to neutrino transport in the simulation of
core-collapse supernovae, one will often start from the classical Boltzmann
equation for the neutrino's spatial, temporal, and spectral evolution. For each
neutrino species, and its anti-particle, the classical density in phase space,
or the associated specific intensity, will be calculated as a function of time.
The neutrino radiation is coupled to matter by source and sink terms on the
"right-hand-side" of the transport equation and together with the equations of
hydrodynamics this set of coupled partial differential equations for classical
densities describes, in principle, the evolution of core collapse and
explosion. However, with the possibility of neutrino oscillations between
species, a purely quantum-physical effect, how to generalize this set of
Boltzmann equations for classical quantities to reflect oscillation physics has
not been clear. To date, the formalisms developed have retained the character
of quantum operator physics involving complex quantities and have not been
suitable for easy incorporation into standard supernova codes. In this paper,
we derive generalized Boltzmann equations for quasi-classical, real-valued
phase-space densities that retain all the standard oscillation phenomenology,
including resonant flavor conversion (the MSW effect), neutrino
self-interactions, and the interplay between decohering matter coupling and
flavor oscillations. With this formalism, any code(s) that can now handle the
solution of the classical Boltzmann or transport equation can easily be
generalized to include neutrino oscillations in a quantum-physically consistent
fashion.


title:
Bottom-Up Approach to Moduli Dynamics in Heavy Gravitino Scenario :
  Superpotential, Soft Terms and Sparticle Mass Spectrum

abstract:
  The physics of moduli fields is examined in the scenario where the gravitino
is relatively heavy with mass of order 10 TeV, which is favored in view of the
severe gravitino problem. The form of the moduli superpotential is shown to be
determined, if one imposes a phenomenological requirement that no physical CP
phase arise in gaugino masses from conformal anomaly mediation. This bottom-up
approach allows only two types of superpotential, each of which can have its
origins in a fundamental underlying theory such as superstring. One
superpotential is the sum of an exponential and a constant, which is identical
to that obtained by Kachru et al (KKLT), and the other is the racetrack
superpotential with two exponentials. The general form of soft supersymmetry
breaking masses is derived, and the pattern of the superparticle mass spectrum
in the minimal supersymmetric standard model is discussed with the KKLT-type
superpotential. It is shown that the moduli mediation and the anomaly mediation
make comparable contributions to the soft masses. At the weak scale, the
gaugino masses are rather degenerate compared to the minimal supergravity,
which bring characteristic features on the superparticle masses. In particular,
the lightest neutralino, which often constitutes the lightest superparticle and
thus a dark matter candidate, is a considerable admixture of gauginos and
higgsinos. We also find a small mass hierarchy among the moduli, gravitino, and
superpartners of the standard-model fields. Cosmological implications of the
scenario are briefly described.


title:
Phenomenology of Mixed Modulus-Anomaly Mediation in Fluxed String
  Compactifications and Brane Models

abstract:
  In some string compactifications, for instance the recently proposed KKLT
set-up, light moduli are stabilized by nonperturbative effects at
supersymmetric AdS vacuum which is lifted to a dS vacuum by supersymmetry
breaking uplifting potential. In such models, soft supersymmetry breaking terms
are determined by a specific mixed modulus-anomaly mediation in which the two
mediations typically give comparable contributions to soft parameters. Similar
pattern of soft terms can arise also in brane models to stabilize the radion by
nonperturbative effects. We examine some phenomenological consequences of this
mixed modulus-anomaly mediation, including the pattern of low energy sparticle
spectrum and the possibility of electroweak symmetry breaking. It is noted that
adding the anomaly-mediated contributions at $M_{GUT}$ amounts to replacing the
messenger scale of the modulus mediation by a mirage messenger scale
$(m_{3/2}/M_{Pl})^{\alpha/2}M_{GUT}$ where
$\alpha=m_{3/2}/[M_0\ln(M_{Pl}/m_{3/2})]$ for $M_0$ denoting the
modulus-mediated contribution to the gaugino mass at $M_{GUT}$. The minimal
KKLT set-up predicts $\alpha=1$. As a consequence, for $\alpha={\cal O}(1)$,
the model can lead to a highly distinctive pattern of sparticle masses at TeV
scale, particularly when $\alpha= 2$.


title:
Study of theory and phenomenology of some classes of family symmetry and
  unification models

abstract:
  We review and compare theoretically and phenomenologically a number of
possible family symmetries, which when combined with unification, could be
important in explaining quark, lepton and neutrino masses and mixings,
providing new results in several cases. Theoretical possibilities include
Abelian or non-Abelian, symmetric or non symmetric Yukawa matrices, Grand
Unification or not. Our main focus is on anomaly-free U(1) family symmetry
combined with SU(5) unification, although we also discuss other possibilities.
We provide a detailed phenomenological fit of the fermion masses and mixings
for several examples, and discuss the supersymmetric flavour issues in such
theories, including a detailed analysis of lepton flavour violation. We show
that it is not possible to quantitatively and decisively discriminate between
these different theoretical possibilities at the present time.


title:
$\Theta^+$-pentaquark parity from associative baryon production in $\pi
  D$ collisions, $\pi^{\pm}+D\to \Theta^+ +\Sigma^{\pm}$

abstract:
  We derive, in model independent way, the spin structure of the matrix element
for the reaction of associative $\Theta^+$ pentaquark production,
$\pi^{\pm}+D\to \Theta^+ +\Sigma^{\pm}, $ in the threshold region and in
collinear kinematics. The expressions for the polarization observables in this
reaction are found assuming spin 1/2 and different parities for $\Theta^+ .$ We
have proved that such reaction can be used for a model independent
determination of the P-parity of $\Theta^+$ only by measuring the $\Theta^+$
polarization. Other polarization observables, such as the dependence of the
$\Sigma^{\pm}$ polarization on the vector and tensor deuteron polarizations,
are insensitive to the $\Theta^+$ parity in the considered kinematical
conditions. All linear and quadratic relations between polarization observables
in $\pi^{\pm}+\vec D\to \Theta^+ +\vec\Sigma^{\pm}(\Theta^+ $ is unpolarized)
do not depend on the parity of the $\Theta^+$ pentaquark.


title: Saturation effects at LHC energies

abstract:
  Within the framework of a modified Balitsky-Kovchegov equation, we calculated
and provide estimates of non-linear saturation effects expected in the LHC
range of energies.


title:
A prelude to Neutron Stars: The phase diagram of the strong interactions
  at finite density

abstract:
  We consider strong interactions at finite density in mean field theory,
through an effective lagrangian that can describe both nuclear matter and quark
matter. This lagrangian has three couplings that are all fixed by experiment
and no other parameters. With increasing baryon density we then find the
following hierarchy. At nuclear density and above we have nuclear matter with
chiral spontaneous symmetry breaking (SSB), followed by the pion condensed
quark matter, again with chiral SSB, albeit with a different realization and
finally a transition to the diquark CFL state which also has chiral SSB (and
colour SSB), with yet another realization. To one's surprise at zero
temperature (in mean field theory), at any finite density chiral symmetry is
never restored!
  We find another remarkable feature and this is that the tree level mass of
the sigma particle, that is set by experiment to about 800 MeV, has a crucial
and unexpected influence on the physics. Strange quark matter and strange stars
are ruled out for a sigma mass above 700 MeV and neutron stars with magnetic
pion condensed cores, that could provide magnetic fields of neutron stars,
exist only for a small interval, between 750-850 MeV, for the sigma mass.


title: Strong interactions at all density

abstract:
  We show using Mean Field Theory that the phase diagram of QCD at finite
density (T=0) is such that chiral symmetry remains spontaeously broken at all
density!


title:
Production of $f_0(1710)$, $f_0(1500)$, and $f_0(1370)$ in $J/\psi$
  hadronic decays

abstract:
  A coherent study of the production of $f_0^i$ ($i=1$, 2, 3 corresponding to
$f_0(1710)$, $f_0(1500)$, and $f_0(1370)$) in $J/\psi\to V f_0 \to V PP$ is
reported based on a previously proposed glueball and $Q\bar{Q}$ nonet mixing
scheme, and a factorization for the decay of $J/\psi\to V f_0^i$, where $V$
denotes the isoscalar vector mesons $\phi$ and $\omega$, and $P$ denotes
pseudoscalar mesons. The results show that the $J/\psi$ decays are very
sensitive to the structure of those scalar mesons, and suggest a glueball in
the $1.5-1.7$ GeV region, in line with Lattice QCD. The presence of significant
glueball mixings in the scalar wavefunctions produces peculiar patterns in the
branching ratios for $J/\psi\to V f_0^i\to VPP$, which are in good agreement
with the recently published experimental data from the BES collaboration.


title: Inflation With Realistic Supersymmetric SO(10)

abstract:
  We implement inflation within a realistic supersymmetric SO(10) model in
which the doublet-triplet splitting is realized through the Dimopoulos-Wilczek
mechanism, the MSSM $\mu$ problem is resolved, and higgsino mediated dimension
five nucleon decay is heavily suppressed. The cosmologically unwanted
topological defects are inflated away, and from $\delta T/ T$, the $B-L$
breaking scale is estimated to be of order $10^{16}-10^{17}$ GeV. Including
supergravity corrections, the scalar spectral index $n_s = 0.99\pm 0.01$, with
$|dn_s/ d{\rm ln}k| \lapproxeq 10^{-3}$.


title:
Approximating Radiative Corrections for Analytical Applications in the
  Data Analysis

abstract:
  Exact calculations of the radiative corrections to the single spin asymmetry
in the exclusive pion electroproduction below $\Delta(1232)$ resonance are
performed by employing the EXCLURAD code. The analysis of the dependence of the
obtained results on $W$, $\theta\_{\rm cm}$ and $\phi$ shows that absolute
values of radiative corrections do not exceed 1.5 %. The procedure of sampling
the radiative corrections with analytical functions has been developed allowing
for flexible and rapid applications of the corrections in the data analysis.


title: Some studies on dark energy related problems

abstract:
  In this work we perform some studies related to dark energy. Firstly, we
propose a dynamical approach to explain the dark energy content of the
universe. We assume that a massless scalar field couples to the Hubble
parameter with some Planck-mass suppressed interactions. This scalar field
developes a Hubble parameter-dependent (thus time-dependent) vacum expectation
value, which renders a time-independent relative density for dark energy and
thus can explain the coincidence of the dark energy density of the universe.
Secondly, we assume the dark matter particle is meta-stable and decays very
lately into the dark energy scalar field. Such a conversion of matter to dark
energy can give an explanation for the starting time of the accelerating
expansion of the universe. Thirdly, we introduce multiple Affleck-Dine fields
to the landscape scenario of dark energy in order to have the required
baryon-asymmetry universe.


title:
Quantitative study of the violation of kt-factorization in
  hadroproduction of quarks at collider energies

abstract:
  We demonstrate the violation of kT-factorization for quark production in high
energy hadronic collisions. This violation is quantified in the Color Glass
Condensate framework and studied as a function of the quark mass, the quark
transverse momentum, and the saturation scale Qsat, which is a measure of large
parton densities. At x values where parton densities are large but leading
twist shadowing effects are still small, violations of kT-factorization can be
significant - especially for lighter quarks. At very small x, where leading
twist shadowing is large, we show that violations of kT-factorization are
relatively weaker.