title:
Feedback effects on the pairing interaction in color superconductors
  near the transition temperature

abstract:
  We examine the role that the gap dependence of the pairing interaction plays
in the gap equation for a weakly coupled uniform superfluid of three-flavor
massless quarks near the transition temperature T_c. We find that the feedback
effects on Landau-damped transverse gluons mediating the pairing interaction
alter the gap magnitude in a way dependent on the color structure of the gap.
We estimate corrections by these effects to the parameters characterizing the
fourth order terms in the Ginzburg-Landau free energy and ensure the stability
of a color-flavor locked state near T_c.


title: Leptogenesis from reheating after inflation and cosmic string decay

abstract:
  Cosmic strings form at the end of standard supersymmetric hybrid inflation,
and both inflation and strings contribute to the CMB anisotropies. If the
symmetry which is broken at the end of inflation is gauged $B$-$L$, there is a
mixed scenario for leptogenesis: Right-handed neutrinos can be produced
non-thermally during reheating via inflaton decay as well as via cosmic string
decay. We show that the parameter space consistent with CMB data can
accommodate either or both scenarios depending on the mass of the right-handed
neutrinos.


title: Decays of the X(3872) into J/psi and Light Hadrons

abstract:
  If the X(3872) is a loosely-bound molecule of the charm mesons D^0 \bar
D^{*0} and D^{*0} \bar D^0, it can decay through the decay of a constituent in
a hadronic channel with a nearby threshold, such as J/\psi \omega or J/\psi
\rho. The differential decay rates of the X into J/\psi \pi^+\pi^-, J/\psi
\pi^+\pi^-\pi^0, J/\psi \pi^0 \gamma, and J/\psi \gamma are calculated in terms
of X J/\psi \rho and X J/\psi \omega coupling constants using an effective
lagrangian that reproduces the decay rates of the \omega and the \rho. The
dependence of the coupling constants on the binding energy and the total width
of the X is determined by a factorization formula. Results from a model by
Swanson are used to predict the partial width of X into J/\psi \pi^+\pi^-\pi^0
as a function of the binding energy and the total width of the X.


title:
Solutions of the Renormalisation Group Equation in Minimal
  Supersymmetric Standard Model

abstract:
  Renormalisation Group Equation(RGE) for color and top couplings sector of
MSSM has been solved. The mass of the top comes out to be 180.363$\pm$ 10.876
GeV and $\beta_{top}$=$\frac{\pi}{2}$. It is conjectured that the masses of the
other 11 fermions and the CKM phase angle $\phi$ can be theoretically
estimated. The results confirm the fact that the quarks and leptons have been
created having equal mass $\sim$ 115 GeV at the MSSM GUT scale $\sim ~2.2\times
10^{16}$ GeV.


title: Pentaquarks in SU(3) quark model

abstract:
  Based on the flavor SU(3) symmetry, we classify all the possible pentaquark
baryons made of four quarks and one antiquark. In particular, we present
possible multiplets of pentaquarks, their interactions with mesons, and the
mass relations within a multiplet. We also study the pentaquark decays in the
generalized OZI rule.


title:
Charmonium production in p pbar annihilation: Estimating cross sections
  from decay widths

abstract:
  The cross sections for the charmonium production processes p pbar -> m Psi,
where m is a light meson and Psi is a charmonium state, are of great interest
for the planned p-pbar experiment PANDA. In this paper we estimate these cross
sections using known results for the decays Psi -> m p pbar which are related
to these reactions by crossing. In lieu of detailed experimental data on the
decay Dalitz plots, we assume a constant amplitude as a first approximation;
this implies a simple relation between the cross sections and decay widths. The
single measured exclusive cross section of this type is p pbar -> pi0 J/psi,
which was reported by E760 to be 130 +/- 25 pb near sqrt(s) = 3.5-3.6 GeV. In
comparison, our constant amplitude estimate is about 300 pb at this energy.
This suggests that our approach is useful as a simple estimate, but should be
refined through detailed modeling of resonances and other energy-dependent
effects in the experimental Psi -> m p pbar Dalitz plots.


title: Ring-like events: Cherenkov gluons or Mach waves?

abstract:
  Similar to electromagnetic forces, strong interactions might induce such
collective effects as Cherenkov and Mach waves. Their conical structure would
be responsible for specific ring-like events. The theoretical and experimental
arguments in favor of these phenomena are discussed and their most important
features are described.


title:
Constituent quark-based linear $\sigma$ model (L$\sigma$M) quark and
  scalar mesons, vector meson dominance

abstract:
  After describing the SU(2) linear sigma model (L$\sigma$M), we dynamically
generate it using the B.W. Lee null tadpole sum (characterizing the true
vacuum) together with the dimensional regularization lemma. Next we generate
the chiral-limiting (CL) nonstrange and strange constituent quark masses ${\hat
m}=325.7$ MeV; $m_s=486$ MeV away from the CL. Finally, we study vector meson
dominance (VMD) and the pion, kaon charge radii and the loop-order
$\rho\to\pi\gamma$, $\pi^0\to\gamma\gamma$ amplitudes in the quark model.
Lastly, we verify this procedure using tree-order VMD graphs.


title: Radiative seesaw and degenerate neutrinos

abstract:
  The radiative see-saw mechanism of Witten generates the right-handed neutrino
masses in SO(10) with the spinorial 16_H Higgs field. We study here
analytically the 2nd and 3rd generations for the minimal Yukawa structure
containing 10_H and 120_H Higgs representations. In the approximation of small
2nd generation masses and gauge loop domination we find the following results :
(1) b-tau unification, (2) natural coexistence between large theta_l and small
theta_q, (3) degenerate neutrinos.


title:
Distinguishing Spins in Supersymmetric and Universal Extra Dimension
  Models at the Large Hadron Collider

abstract:
  An interesting alternative to supersymmetry (SUSY) for extending physics
beyond the Standard Model is a model with universal extra dimensions (UED), in
which the SUSY superpartners are replaced by Kaluza-Klein excitations of the
Standard Model particles. If new particles are discovered at the LHC, even if
their mass spectrum favours SUSY or UED, it will be vital to distinguish
between their spin assignments in the two models as far as possible. We extend
the method proposed by Barr [hep-ph/0405052] to the UED case and investigate
the angular and charge asymmetries of decay distributions for sample mass
spectra of both SUSY and UED types. For hierarchical (`SUSY-type') mass spectra
there is a good chance of distinguishing the spin structures of the two models.
However, a mass spectrum of the quasi-degenerate type expected in UED would
make it difficult to observe spin correlations.


title: Chiral phase structure of QCD with many flavors

abstract:
  We investigate QCD with a large number of massless flavors with the aid of
renormalization group flow equations. We determine the critical number of
flavors separating the phases with and without chiral symmetry breaking in
SU(Nc) gauge theory with many fermion flavors. Our analysis includes all
possible fermionic interaction channels in the pointlike four-fermion limit.
Constraints from gauge invariance are resolved explicitly and regulator-scheme
dependencies are studied. Our findings confirm the existence of an Nf window
where the system is asymptotically free in the ultraviolet, but remains
massless and chirally invariant on all scales, approaching a conformal fixed
point in the infrared. Our prediction for the critical number of flavors of the
zero-temperature chiral phase transition in SU(3) is Nf^{cr}=10.0\pm
  0.29(fermion)[+1.55;-0.63](gluon), with the errors arising from
approximations in the fermionic and gluonic sectors, respectively.


title: Gravitino dark matter from gluino late decay in split supersymmetry

abstract:
  In split-supersymmetry (split-SUSY), gluino is a metastable particle and thus
can freeze out in the early universe. The late decay of such a long-life gluino
into the lightest supersymmetric particle (LSP) may provide much of the cosmic
dark matter content. In this work, assuming the LSP is gravitino produced from
the late decay of the metastable gluino, we examine the WMAP dark matter
constraints on the gluino mass. We find that to provide the full abundance of
dark matter, the gluino must be heavier than about 14 TeV and thus not
accessible at the CERN Large Hadron Collider (LHC).


title: Generating Functional for Strong and Nonleptonic Weak Interactions

abstract:
  The generating functional for Green functions of quark currents is given in
closed form to next-to-leading order in the low-energy expansion for chiral
SU(3), including one-loop amplitudes with up to three meson propagators. Matrix
elements and form factors for strong and nonleptonic weak processes with at
most six external states can be extracted from this functional by performing
three-dimensional flavour traces. To implement this procedure, a Mathematica
program is provided that evaluates amplitudes with at most six external mesons,
photons (real or virtual) and virtual W (semileptonic form factors). The
program is illustrated with several examples that can be compared with existing
calculations.


title:
The improved 10th order QED expression for a_{\mu} : new results and
  related estimates

abstract:
  New estimates of the 10th order QED corrections to the muon anomalous
magnetic moment are presented. The estimates include the information on
definite improved 10th order QED contributions to $a_{\mu}$, calculated by
Kinoshita and Nio. The final estimates are in good agreement with the ones,
given recently by Kinoshita.


title: Quarkonium Production at High-Energy Hadron Colliders

abstract:
  This thesis can be divided into several parts. The first one consists in a
detailed historical review of quarkonium physics, centered on the different
production models successively introduced. Then comes a review of the currently
available data on high-energy hadronic production of J/psi, psi' and Upsilon's.
In a third part, we concentrate on the extension of the Colour-Singlet Model
beyond the static approximation. In this extension, we emphasise that a simple
generalisation of the static case is not sufficient and new 4-point vertices
are to be introduced to restore gauge invariance. Since these new vertices are
not fully constrained, we propose a method to study this freedom. Finally, we
apply our approach to the production at the Tevatron and RHIC, where we show
that a combination of our contributions with fragmentation within the
Colour-Octet Mechanism is able to reproduce the measurements both for cross
sections and for polarisation.


title: SU(3) family symmetry and neutrino bi-tri-maximal mixing

abstract:
  The observed large mixing angles in the lepton sector may be the first signal
for the presence of a non-Abelian family symmetry. However, to obtain the
significant differences between the mixing of the neutrino and charged fermion
sectors, the vacuum expectation values involved in the breaking of such a
symmetry in the two sectors must be misaligned. We investigate how this can be
achieved in models with an SU(3) family symmetry consistent with an underlying
GUT. We show that such misalignment can be achieved naturally via the see-saw
mechanism. We construct a specific example in which the vacuum (mis)alignment
is guaranteed by additional symmetries. This model generates a fermion mass
structure consistent with all quark and lepton masses and mixing angles.
Neutrino mixing is close to bi-tri-maximal mixing.


title: Possible Molecular Structure of the Newly Observed Y(4260)

abstract:
  We suggest that the newly observed resonance Y(4260) is a $\chi_{c}-\rho^0$
molecule, which is an isovector. In this picture, we can easily interpret why
$Y(4260)\to \pi^+\pi^-J/\psi$ has a larger rate than $Y(4260)\to D\bar D$ which
has not been observed, and we also predict existence of the other two
components of the isotriplet and another two possible partner states which may
be observed in the future experiments. A direct consequence of this structure
is that for this molecular structure $Y(4260)\to \pi^+\pi^-J/\psi$ mode is more
favorable than $Y(4260)\to K\bar KJ/\psi$ which may have a larger fraction if
other proposed structures prevail.


title:
One-loop weak corrections to hadronic production of Z bosons at large
  transverse momenta

abstract:
  To match the precision of present and future measurements of Z-boson
production at hadron colliders, electroweak radiative corrections must be
included in the theory predictions. In this paper we consider their effect on
the transverse momentum ($p_T$) distribution of Z bosons, with emphasis on
large $p_T$. We evaluate, analytically and numerically, the full one-loop
corrections for the parton scattering reaction $q\bar q \to Z g$ and its
crossed variants. In addition we derive compact approximate expressions which
are valid in the high-energy region, where the weak corrections are strongly
enhanced by logarithms of $\hat s/M_W^2$. These expressions include quadratic
and single logarithms as well as those terms that are not logarithmically
enhanced. This approximation, which confirms and extends earlier results
obtained to next-to-leading logarithmic accuracy, permits to reproduce the
exact one-loop corrections with high precision. Numerical results are presented
for proton-proton and proton-antiproton collisions. The corrections are
negative and their size increases with $p_T$. For the Tevatron they amount up
to -7% at 300 GeV. For the LHC, where transverse momenta of 2 TeV or more can
be reached, corrections up to -40% are observed. We also include the dominant
two-loop effects of up to 8% in our final LHC predictions.


title:
Universality of transverse momentum resummation for electroweak boson
  production

abstract:
  We perform a global analysis of transverse momentum distributions in
Drell-Yan pair and Z boson production in order to investigate universality of
nonperturbative contributions to the Collins-Soper-Sterman resummed form
factor. Our fit made in an improved nonperturbative model suggests that the
nonperturbative contributions follow universal nearly-linear dependence on the
logarithm of the heavy boson invariant mass Q, which closely agrees with an
estimate from the infrared renormalon analysis.


title: Photoproduction of the Theta^+ resonance on the nucleon in a Regge model

abstract:
  We estimate the reaction mechanisms for the photoproduction of the
Theta^+(1540) resonance on the nucleon, through K and K^* Regge exchanges. We
compare the size of the cross sections for the gamma n -> K^- Theta^+ and gamma
p -> K^0 bar Theta^+ reactions, and investigate their sensitivity to the
spin-parity assignments J^P = 1/2^\pm, 3/2^\pm for the Theta^+ resonance. The
model allows to estimate the cross sections corresponding with a given upper
bound on the width of the Theta^+. Within this model, the cross sections on the
neutron are found to be around a factor 5 larger than the ones on the proton,
due to the presence of charged K exchange for the reaction on a neutron target.
Furthermore, the photon asymmetry is found to display a pronounced sensitivity
to the parity of the Theta^+, making it a very promising observable to help
determining the quantum numbers of the Theta^+ resonance.


title:
Extracting the Sivers function from polarized SIDIS data and making
  predictions

abstract:
  The most recent data on the weighted transverse single spin asymmetry
$A_{UT}^{\sin(\phi_h-\phi_S)}$ from HERMES and COMPASS collaborations are
analysed within LO parton model with unintegrated parton distribution and
fragmentation functions; all transverse motions are taken into account, with
exact kinematics, in the elementary interactions. The overall quality of the
data is such that, for the first time, a rather well constrained extraction of
the Sivers function for $u$ and $d$ quarks is possible and is performed.
Comparisons with models are made. Based on the extracted Sivers functions,
predictions for $A_{UT}^{\sin(\phi_h-\phi_S)}$ asymmetries at JLab are given;
suggestions for further measurements at COMPASS, with a transversely polarized
hydrogen target and selecting favourable kinematical ranges, are discussed.
Predictions are also presented for Single Spin Asymmetries (SSA) in Drell-Yan
processes at RHIC and GSI.


title: Flipped SU(5), see-saw scale physics and degenerate vacua

abstract:
  We investigate the requirement of the existence of two degenerate vacua of
the effective potential as a function of the Weinberg-Salam Higgs scalar field
norm, as suggested by the multiple point principle, in an extension of the
Standard Model including see-saw scale physics. Results are presented from an
investigation of an extension of the Standard Model to the gauge symmetry group
SU(3)_C\times SU(2)_L\times U(1)'\times \tilde U(1), where two groups U(1)' and
\tilde U(1) originate at the see-saw scale M_{SS}, when heavy (right-handed)
neutrinos appear. The consequent unification of the group SU(3)_C\times
SU(2)_L\times U(1)' into the flipped SU(5) at the GUT scale leads to the group
SU(5)\times \tilde U(1). We assume the position of the second minimum of the
effective potential coincides with the fundamental scale, here taken to be the
GUT scale. We solve the renormalization group equations in the one-loop
approximation and obtain a top-quark mass of 171\pm 3 GeV and a Higgs mass of
129\pm 4 GeV, in the case when the Yukawa couplings of the neutrinos are less
than half that of the top quark at the GUT scale.


title:
Dual parameterization of generalized parton distributions and
  description of DVCS data

abstract:
  We discuss a new leading-order parameterization of generalized parton
distributions of the proton, which is based on the idea of duality. In its
minimal version, the parameterization is defined by the usual quark singlet
parton distributions and the form factors of the energy-momentum tensor. We
demonstrate that our parameterization describes very well the absolute value,
the Q^2-dependence and the W-dependence of the HERA data on the total DVCS
cross section and contains no free parameters in that kinematics. The
parameterization suits especially well the low-x_{Bj} region, which allows us
to advocate it as a better alternative to the frequently used double
distribution parameterization of the GPDs.


title:
Ambiguities in the calculation of leptonic decays of excited heavy
  quarkonium

abstract:
  We point out that the determination of the leptonic decay width of
radially-excited quarkonia is strongly dependent on the position of the node
typical of these excitations. We suggest that this feature could be related
with the longstanding rho-pi puzzle.


title: Positron Polarization at the International Linear Collider

abstract:
  We review some recent arguments supporting the upgrade of the International
Linear Collider by a polarized positron beam, in addition to the polarized
electron beam. The examples presented here mainly focus on the impact of
positron polarization on items relevant to new physics searches, such as the
identification of novel interactions in fermion-pair production and the
formulation of new CP-sensitive observables. In particular, in addition to the
benefits from positron and electron longitudinal polarizations, the advantages
in this field of having transverse polarization of both beams are emphasized.


title:
Spin-1 Correlators at Large NC: Matching OPE and Resonance Theory up to
  O(alpha_s)

abstract:
  The relation between the quark-gluon description of QCD and the hadronic
picture is studied up to order alpha_s. The analysis of the spin-1 correlators
is developed within the large NC framework. Both representations are shown to
be equivalent in the euclidean domain, where the Operator Product Expansion is
valid. By considering different models for the hadronic spectrum at high
energies, one is able to recover the alpha_s running in the correlators, to fix
the rho(770) and a1(1260) couplings, and to produce a prediction for the values
of the condensates. The Operator Product Expansion is improved by the large NC
resonance theory, extending its range of validity. Dispersion relations are
employed in order to study the minkowskian region and some convenient sum
rules, specially sensitive to the resonance structure of QCD, are worked out. A
first experimental estimate of these sum rules allows a cross-check of former
determinations of the QCD parameters and helps to discern and to discard some
of the considered hadronical models. Finally, the truncated resonance theory
and the Minimal Hadronical Approximation arise as a natural approach to the
full resonance theory, not as a model.


title: Tetraquark and Pentaquark Systems in Lattice QCD

abstract:
  Motivated by the recent experimental discoveries of multi-quark candidates,
e.g., the $\Theta^+(1540)$, we study multi-quark systems in lattice QCD. First,
we perform accurate mass measurements of low-lying 5Q states with $J=1/2$ and
I=0 in both positive- and negative-parity channels in anisotropic lattice QCD.
The lowest positive-parity 5Q state is found to have a large mass of about
2.24GeV after the chiral extrapolation. To single out the compact 5Q state from
$NK$ scattering states, we develop a new method with the hybrid-boundary
condition (HBC), and find no evidence of the compact 5Q state below 1.75GeV in
the negative-parity channel. Second, we perform the first study of the
multi-quark potential in lattice QCD to clarify the inter-quark interaction in
multi-quark systems. The 5Q potential $V_{\rm 5Q}$ for the QQ-${\rm
\bar{Q}}$-QQ system is found to be well described by the ``OGE Coulomb plus
multi-Y Ansatz": the sum of the one-gluon-exchange (OGE) Coulomb term and the
multi-Y-type linear term based on the flux-tube picture. The 4Q potential
$V_{\rm 4Q}$ for the QQ-${\rm \bar{Q}\bar{Q}}$ system is also described by the
OGE Coulomb plus multi-Y Ansatz, when QQ and $\rm \bar Q \bar Q$ are well
separated. The 4Q system is described as a "two-meson" state with disconnected
flux tubes, when the nearest quark and antiquark pair is spatially close. We
observe a lattice-QCD evidence for the ``flip-flop'', i.e., the flux-tube
recombination between the connected 4Q state and the ``two-meson'' state. On
the confinement mechanism, the lattice QCD results indicate the flux-tube-type
linear confinement in multi-quark hadrons.


title: Colour-superconducting strangelets in the Nambu--Jona-Lasinio model

abstract:
  The two-flavour colour-superconducting (2SC) phase in small strangelets is
studied. In order to describe the 2SC phase we use the three-flavour
Nambu--Jona-Lasinio model. We explicitly take into account finite size effects
by making use of the approximation for the density of states in spherical
cavities called multiple reflection expansion (MRE). The thermodynamic
potential for the 2SC strangelets is derived in the mean-field approximation
with the help of the MRE. We found that 2SC phase survives in small strangelets
with a sizable gap. Consequences for the 2SC phases are also discussed.


title:
Event-by-Event Analysis of Baryon-Strangeness Correlations: Pinning Down
  the Critical Temperature and Volume of QGP Formation

abstract:
  The recently proposed baryon-strangeness correlation (C_BS) is studied with a
string-hadronic transport model (UrQMD) for various energies from E_lab=4 AGeV
to \sqrt s=200 AGeV. It is shown that rescattering among secondaries can not
mimic the predicted correlation pattern expected for a Quark-Gluon-Plasma.
However, we find a strong increase of the C_BS correlation function with
decreasing collision energy both for pp and Au+Au/Pb+Pb reactions. For Au+Au
reactions at the top RHIC energy (\sqrt s=200 AGeV), the C_BS correlation is
constant for all centralities and compatible with the pp result. With
increasing width of the rapidity window, C_BS follows roughly the shape of the
baryon rapidity distribution. We suggest to study the energy and centrality
dependence of C_BS which allow to gain information on the onset of the
deconfinement transition in temperature and volume.


title:
Mixed heavy-quark-gluon condensate in the stochastic vacuum model and
  dual superconductor

abstract:
  The world-line formalism is used for the evaluation of the mixed
heavy-quark-gluon condensate in two models of QCD - the stochastic vacuum model
and the dual superconductor one. Calculations are performed for an arbitrary
dimensionality of space-time $d\ge 2$. While in the stochastic vacuum model,
the condensate is UV finite up to $d=8$, in the dual superconductor model it is
UV divergent at any $d\ge 2$. A regularization of this divergence is proposed,
which makes quantitative the condition of the type-II dual superconductor. The
obtained results are generalized to the case of finite temperatures.
Corrections to the both, mixed and standard, heavy-quark condensates, which
appear due to the variation of the gauge field at the scale of the vacuum
correlation length, are evaluated within the stochastic vacuum model. These
corrections diminish the absolute values of the condensates, as well as the
ratio of the mixed condensate to the standard one.


title: Light Mesons and Muon Radiative Decays and Photon Polarization Asymmetry

abstract:
  We systematically compute and discuss meson and muon polarized radiative
decays. Doubly differential distributions in terms of momenta and helicities of
the final lepton and photon are explicitly computed. The undergoing dynamics
giving rise to lepton and photon polarizations is examined and analyzed in the
soft and hard region of momenta. The particular configurations made by
right-handed leptons with accompanying photons are investigated and interpreted
as a manifestation of the axial anomaly. The photon polarization asymmetry is
evaluated. Finiteness of polarized amplitudes against infrared and collinear
singularities is shown to take place with mechanisms distinguishing between
right handed and left handed final leptons. We propose a possible test using
photon polarization to clarify a recently observed discrepancy in radiative
meson decays.


title: Splitting Extended Supersymmetry

abstract:
  We show how splitting supersymmetry reconciles a class of intersecting brane
models with unification. The gauge sector in these models arises in multiplets
of extended supersymmetry while matter states are in N=1 representations. A
deformation of the angles between the branes gives large masses to squarks and
sleptons, as well as supersymmetry breaking contributions to other string
states. The latter generate at one-loop heavy Dirac masses for Winos and
gluinos and can induce a mass term for the Higgsino doublets. We find that this
scenario is compatible with gauge coupling unification at high scale for both
cases where the gauge sector is N=2 and N=4 supersymmetric. Moreover a
neutralino, combination of neutral Higgsinos and Binos, is a natural candidate
for dark matter.


title:
Anomaly Mediation, Fayet-Iliopoulos D-terms and precision sparticle
  spectra

abstract:
  We consider the sparticle spectra that arise when anomaly mediation is the
source of supersymmetry-breaking and the tachyonic slepton problem is solved by
a Fayet-Iliopoulos D-term. We also show how this can lead to a minimal viable
extension of anomaly mediation, in which the gauge symmetry associated with
this D-term is broken at very high energies, leaving as its footprint in the
low energy theory only the required D-terms and seesaw neutrino masses.


title: Robust Gamma Ray Signature of WIMP Dark Matter

abstract:
  If dark matter consists of weakly interacting massive particles (WIMPs),
annihilation of WIMPs in the galactic center may lead to an observable
enhancement of high energy gamma ray fluxes. We predict the shape and
normalization of the component of the flux due to final state radiation by
charged particles produced in WIMP annihilation events. The prediction is made
without any assumptions about the microscopic theory responsible for WIMPs, and
depends only mildly on the unknown distribution of the total WIMP annihilation
cross section among the possible final states. In particular, if the WIMPs
annihilate into a pair of charged fermions (leptons or quarks), the photon
spectrum possesses a sharp edge feature, dropping abruptly at a photon energy
equal to the WIMP mass. If such a feature is observed, it would provide strong
evidence for the WIMP-related nature of the flux enhancement, as well as a
measurement of the WIMP mass. We discuss the prospects for observational
discovery of this feature at ground-based and space-based gamma ray telescopes.


title: Anomalies as a signature of extra dimensions

abstract:
  The anomaly cancellation condition of the Standard Model may be unnatural in
theories with extra dimensions as an anomaly of a low-energy 4-dimensional
theory can be canceled by an inflow from a bulk. This inflow may give rise to
an observable effect at low energies. We analyze several physical models in
which this effect exists and estimate constraints on its value, imposed by the
modern experimental data. We show that the effect can be large enough to be
observed even when these constraints are satisfied. Positive result of such an
experiment would be a low-energy signature of the existence of extra
dimensions.


title:
Transverse Momentum Distribution Through Soft-Gluon Resummation in
  Effective Field Theory

abstract:
  We study resummation of transverse-momentum-related large logarithms
generated from soft-gluon radiations in soft-collinear effective field theory.
The anomalous dimensions of the effective quark and gluon currents, an
important ingredient for the resummation, are calculated to two-loop order. the
result at next-to-leading-log reproduces that obtained using the standard
method for deep-inelastic scattering, Drell-Yan process, and Higgs production
through gluon-gluon fusion. We comment on the extension of the calculation to
next-to-next-to-leading logarithms.


title: Deconfinement transition dynamics and early thermalization in QGP

abstract:
  We perform SU(3) Lattice Gauge Theory simulations of the deconfinement
transition attempting to mimic conditions encountered in heavy ion collisions.
Specifically, we perform a sudden temperature quench across the deconfinement
temperature, and follow the response of the system in successive simulation
sweeps under spatial lattice expansion and temperature fall-off. In
measurements of the Polyakov loop and structure functions a robust strong
signal of global instability response is observed through the exponential
growth of low momentum modes. Development of these long range modes isotropizes
the system which reaches thermalization shortly afterwards, and enters a stage
of quasi-equilibrium expansion and cooling till its return to the confinement
phase. The time scale characterizing full growth of the long range modes is
largely unaffected by the conditions of spatial expansion and temperature
variation in the system, and is much shorter than the scale set by the interval
to return to the confinement phase. The wide separation of these two scales is
such that it naturally results in isotropization times well inside 1 fm/c.


title: Determination of Littlest Higgs model parameters at the ILC

abstract:
  We examine the effects of the extended gauge sector of the Littlest Higgs
model in high energy e+e- collisions. We find that the search reach in e+e- ->
f fbar at a 500 GeV center-of-mass energy International Linear Collider covers
essentially the entire parameter region where the Littlest Higgs model is
relevant to the gauge hierarchy problem. In addition, we show that this channel
provides an accurate determination of the fundamental model parameters, to the
precision of a few percent, provided that the LHC measures the mass of the
heavy neutral gauge field. Additionally, we show that the couplings of the
extra gauge bosons to the light Higgs can be observed from the process e+e- ->
Z higgs for a significant region of the parameter space. This allows for
confirmation of the structure of the cancelation of the Higgs mass quadratic
divergence and would verify the little Higgs mechanism.


title: Gluonic charmonium resonances at BaBar and Belle?

abstract:
  We confront predictions for hybrid charmonium and other gluonic excitations
in the charm region with recently observed structures in the mass range above 3
GeV. The Y(4260), if resonant, is found to agree with expectations for hybrid
charmonium. The possibility that other gluonic excitations may be influencing
the data in this region is discussed.


title: Spin Light of Neutrino in Dense Matter

abstract:
  We develop the quantum theory of the spin light of neutrino ($SL\nu$) exactly
accounting for the effect of background matter. Contrary to the already
performed studies of the $SL\nu$, in this paper we derive explicit and closed
expressions for the $SL\nu$ rate and power and for the emitted photon energy,
which are valid for an arbitrary matter density (including very high values).
The spatial distribution of the radiation power and the dependence of the
emitted photon energy on the direction of radiation are also studied in detail
for the first time. We analyze the $SL\nu$ polarization properties and show
that within a wide range of neutrino momenta and matter densities the $SL\nu$
radiation is circularly polarized. Conditions for effective $SL\nu$ photon
propagation in the electron plasma are discussed. It is also shown that in
dense matter the average energy of the emitted photon can reach values in the
range from one third of the neutrino momentum up to one half of the neutrino
energy in matter. The main features of the studied radiation are summarized,
and possibilities for the $SL\nu$ production during different astrophysical and
cosmology processes are discussed.


title: Dominant Two-Loop Electroweak Correction to H -> gamma gamma

abstract:
  We discuss a recent analysis of a dominant two-loop electroweak correction,
of O(G_F M_t^2), to the partial width of the decay of an intermediate-mass
Higgs boson into a pair of photons. The asymptotic-expansion technique was used
in order to extract the leading dependence on the top-quark mass plus four
expansion terms that describe the dependence on the W- and Higgs-boson masses.
This correction reduces the Born result by approximately 2.5%. As a by-product
of this analysis, also the O(G_F M_t^2) correction to the partial width of the
Higgs-boson decay to two gluon jets was recovered.


title: Charmonium production in two-photon collisions at next-to-leading order

abstract:
  We review recent results on the production of prompt charmonium in
association with a hadron jet or a prompt photon in two-photon collisions at
next-to-leading order in the factorization framework of nonrelativistic quantum
chromodynamics.


title:
Inclusive electroproduction of light hadrons with large p_T at
  next-to-leading order

abstract:
  We review recent results on the inclusive electroproduction of light hadrons
at next-to-leading order in the parton model of quantum chromodynamics
implemented with fragmentation functions and present updated predictions for
HERA experiments based on the new AKK set.


title: Multigap Diffraction at LHC

abstract:
  The large rapidity interval available at the Large Hadron Collider (LHC)
offers an arena in which the QCD aspects of diffraction may be explored in an
environment free of gap survival complications using events with multiple
rapidity gaps.


title: Oddballs and a Low Odderon Intercept

abstract:
  We report an odderon Regge trajectory emerging from a field theoretical
Coulomb gauge QCD model for the odd signature JPC (P=C= -1) glueball states
(oddballs). The trajectory intercept is clearly smaller than the pomeron and
even the omega trajectory's intercept which provides an explanation for the
nonobservation of the odderon in high energy scattering data. To further
support this result we compare to glueball lattice data and also perform
calculations with an alternative model based upon an exact Hamiltonian
diagonalization for three constituent gluons.


title: Why the OZI rule is so strongly violated in J/Psi decays?

abstract:
  The new $f_0(1790)$ meson recently observed by BES collaboration in
$J/\Psi$-decay, is seen only in the OZI-forbidden channel. It is shown that
chiral symmetry restoration in excited hadrons implies a new selection rule of
dynamical origin that forbids some of the OZI-favoured mechanisms of decays.
Hence decays into channels that are suppressed by OZI can become dominant.


title: Top quark physics in hadron collisions

abstract:
  The top quark is the heaviest elementary particle observed to date. Its large
mass makes the top quark an ideal laboratory to test predictions of
perturbation theory concerning heavy quark production at hadron colliders. The
top quark is also a powerful probe for new phenomena beyond the Standard Model
of particle physics. In addition, the top quark mass is a crucial parameter for
scrutinizing the Standard Model in electroweak precision tests and for
predicting the mass of the yet unobserved Higgs boson. Ten years after the
discovery of the top quark at the Fermilab Tevatron top quark physics has
entered an era where detailed measurements of top quark properties are
undertaken. In this review article an introduction to the phenomenology of top
quark production in hadron collisions is given, the lessons learned in Tevatron
Run I are summarized, and first Run II results are discussed. A brief outlook
to the possibilities of top quark research a the Large Hadron Collider,
currently under construction at CERN, is included.


title:
Chiral symmetry breaking via constituent quarks for qbarq pseudoscalar
  mesons

abstract:
  We base our chiral symmetry approach on the quark-level linear sigma model
Lagrangian. Then we review the Nambu--Goldstone theorem with vanishing pi, K,
eta_8 masses. Next we dynamically generate the pi, K, eta_8 masses away from
the chiral limit. Then we study pion and kaon Goldberger-Treiman relations.
Finally we extend this qbarq scheme to scalar and vector mesons. We also show
the above qbarq meson scheme fits the higher mass octet baryon qqq pattern as
well.


title:
Bound Energy Masses of Mesons Containing the Fourth Generation and
  Iso-singlet Quarks

abstract:
  The fourth Standard Model (SM) family quarks and weak iso-singlet quarks The
fourth Standard Model (SM) family quarks and weak iso-singlet quarks predicted
by ${\rm E}_{6\text{}}$ GUT are considered. The spin-average of the
pseudoscalar $\eta_{4}(n^{1}S_{0})$ and vector $\psi_{4}(n^{3}S_{1})$
quarkonium binding masses of the new mesons formed by the fourth Standard Model
(SM) family and iso-singlet ${\rm E}_{6\text{}}$ with their mixings to ordinary
quarks are investigated. Further, the fine and hyperfine mass splittings of the
these states are also calculated. We solved the Schr\"{o}dinger equation with
logarithmic and Martin potentials using the Shifted large-${\rm N}$ expansion
technique. Our results are compared with other models to gauge the reliability
of the predictions and point out differences.


title: Dissipation, hydrodynamics and the fireball

abstract:
  We investigate the hydrodynamics of the QCD plasma using dimensionless
numbers built from the thermodynamics and transport theory of the plasma and
characteristic dimensions of the fireball produced in heavy-ion collisions. We
find that by the usual measures, dissipation is strong, and the fireball is on
the borderline of equilibrium. As a result, the system is richer in phenomena
than ideal hydrodynamics would predict. One general implication is that it may
be possible to get a direct view of the QCD plasma phase rather than having to
infer its existence indirectly from signals that come from the freezeout
isotherm after the fireball has cooled into the hadronic phase.


title: QCD - NLC

abstract:
  We give a status report of our current theoretical work on QCD near the
light-cone.


title: Ambiguities pertaining to quark-lepton complementarity

abstract:
  Recently the possible origin of the so-called quark-lepton complementarity
relations has received a considerable amount of attention. We point out some of
the inherent ambiguities in such analyses.


title:
Lepton flavor violating Z->l_1^+ l_2^- decay in the split fermion
  scenario in the two Higgs Doublet model

abstract:
  We predict the branching ratios of Z-> e^{\pm} \mu^{\pm}, Z-> e^{\pm}
\tau^{\pm} and Z-> \mu^{\pm} \tau^{\pm} decays in the framework of the 2HDM, in
the split fermion scenario. We observe that the branching ratios are not
sensitive to a single extra dimension, however, this sensitivity is
considerably large for two extra dimensions.


title: Testing Cosmology at the ILC

abstract:
  We investigate the capabilities for the LHC and the ILC to perform
measurements of new physics parameters relevant for the calculation of the
cosmological relic abundance of the lightest neutralino in supersymmetry.
Specifically, we delineate the range of values for the cold dark matter relic
abundance $\Omega_{\chi} h^2$, which will be consistent with the expected
precision measurements at the LHC, and, subsequently, at the ILC. We illustrate
our approach with a toy study of an "updated benchmark" point B'. We then show
some preliminary results of a similar analysis along those lines of the LCC2
benchmark point in the focus point region.


title: A Closer Look at the Analysis of NLL BFKL

abstract:
  The initial analyses of the next-to-leading logarithmic corrections to the
BFKL kernel were very discouraging. Encouraged by the success of new methods in
the analysis of the BFKL equation at full NLL accuracy we demonstrate in this
talk how some of the initial conclusions were based on a breakdown of the tools
used in the analysis rather than the framework itself.


title:
Running coupling constant from lattice data and bulk viscosity of
  strange quark matter

abstract:
  We study the bulk viscosity of strange quark matter (SQM) in a quasiparticle
model at finite chemical potential by extrapolating the previous quasiparticle
model of finite temperature lattice QCD. The more proper bulk viscosity
coefficient can be given in this model where chemical potential $\mu$ and
coupling constant $\emph{g}$ are interdependent. We also apply our result to
determine the critical rotation of strange stars by r-mode instability window.
Our model is compatible to the millisecond pulsar data for a wide range of mass
and radius of the stars.


title: Model of Geometric Neutrino Mixing

abstract:
  Current neutrino oscillation data from solar, atmospheric, and reactor
experiments are consistent with the neutrino mixing matrix elements taking
values sin^2\theta_{12} = 1/3, sin^2\theta_{23} = 1/2, and sin^2\theta_{13}=0.
We present a class of renormalizable gauge models which realize such a
geometric mixing pattern naturally. These models, which are based on the
non--Abelian discrete symmetry A_4, place significant restrictions on the
neutrino mass spectrum, which we analyze. It is shown that baryogenesis via
leptogenesis occurs quite naturally, with a single phase (determined from
neutrino oscillation data) appearing in leptonic asymmetry and in neutrinoless
double beta decay. Such predicted correlations would provide further tests of
this class of models.


title: Constraining Modular Inflation in the MSSM from Giant Q-Ball Formation

abstract:
  We discuss constraints on which flat directions can have large vacuum
expectation values (VEVs) after inflation. We show that only flat directions
which are not charged under B-L and develop positive pressure due to
renormalization group effects can have large VEVs of order $\Mp$. For example,
within the MSSM only the $H_uH_d$ flat direction is found to be viable. This
strongly constrains the embedding of a broad class of inflationary models in
the MSSM or some other supersymmetric extension of the SM. For flat directions
with negative pressure, the condensate fragments into very large Q-balls which
we call Q-giants. We discuss the formation, evolution and reheating of these
Q-giants and show that they decay too late. The analysis requires taking into
account new phases of the flat directions, which have been overlooked in the
formation and dynamics of the Q-balls. These constraints may be ameliorated by
invoking a short period of thermal inflation. The latter, however, is viable in
a very narrow window of parameter space and requires fine tuning.


title: Process e^+ e^- \to 3\pi (\gamma) with final state radiative corrections

abstract:
  We consider the process of annihilation of e^+ e^- to three pion final state
for the case of moderately high energies. The final state emission of virtual
and real photon is considered explicitly. The calculations are performed in
frames of QED with point-like mesons and pion part of chiral perturbation
theory. Some numerical estimates are given.


title: Heavy-quarkonium production at next-to-leading order

abstract:
  We review recent progress in the description of heavy-quarkonium production
in 2->2 processes at next-to-leading order in the factorization framework of
nonrelativistic quantum chromodynamics. Specifically, we consider the
production of prompt charmonium in association with a hadron jet or a prompt
photon in two-photon collisions and exclusive double-charmonium production in
e^+e^- annihilation.


title:
The relations between Bjorken polarized, Bjorken unpolarized and
  Gross--Llewellyn Smith sum rules

abstract:
  New relations between Bjorken polarized, Bjorken unpolarized and
Gross-Llewellyn Smith sum rules are desribed. These relations are valid in the
region, where both perturbative series and the series in power-suppressed
$1/Q^2$-terms do not yet mahifest the features of asymptotic expansions. The
experimentally based considerations support these relations which may surve as
the guide for possible in future measurements of the Bjorken unpolarized sum
rule at Neutrino Factories.


title: Higgs-less Higgs mechanism: low-energy expansion

abstract:
  In this talk, we describe an effective theory for electroweak symmetry
breaking without a physical Higgs, based on a symmetry larger than the
electroweak gauge group. This symmetry forbids deviations from the Standard
Model at the leading order in the appropriate chiral expansion. Indeed, the
large symmetry allows for a consistent expansion of the effective theory in
powers of momenta and spurions. The latter are automatically present: they
define the covariant reduction from the large symmetry to the electroweak
group.


title: Physics at an Upgraded Fermilab Proton Driver

abstract:
  In 2004 the Fermilab Long Range Planning Committee identified a new high
intensity Proton Driver as an attractive option for the future, primarily
motivated by the recent exciting developments in neutrino physics. Over the
last few months a physics study has developed the physics case for the Fermilab
Proton Driver. The potential physics opportunities are discussed.


title: Charge and CP symmetry breaking in two Higgs doublet models

abstract:
  We show that, for the most generic model with two Higgs doublets possessing a
minimum that preserves the $U(1)_{em}$ symmetry, charge breaking (CB) cannot
occur. If CB does not occur, the potential could have two different minima, and
there is in principle no general argument to show which one is the deepest. The
depth of the potential at a stationary point that breaks CB or CP, relative to
the $U(1)_{em}$ preserving minimum, is proportional to the squared mass of the
charged or pseudoscalar Higgs, respectively.


title:
Analysis of new charmless strange B decay data leaves high $B\to K\eta'$
  and $B\to K\eta' X$ still unexplained

abstract:
  The question of whether the anomalously large $B \to K\eta' $ and $B \to
K\eta' X $ (inclusive) branching ratios are consistent with the standard model
or a sign of new physics is still open and in the experimental court. The
nature of the extra hadron $X$ in $B \to K\eta' X $ is completely unknown.
Directions for investigation and analysis of inclusive data are suggested as
well as for comparable inclusive data on $B \to K\eta X $.
  New data confirming the prediction $BR(K^\pm \rho^o) = BR(K^\pm \omega)$
support flavor-topology $B \to VP$ sum rules based on the OZI rule and
emphasize the sharp contrast with the failure of the analogous $B \to PP $ sum
rule due to the anomalously large $BR(B \to K\eta')$. Confirmation of OZI
validity in B-decay analyses for VP final states suggests improving data on the
analogous neutral decay difference $BR(B^o \to K^o \rho^o) - BR(B^o \to K^o
\omega)$ which measures tree-penguin interference and possible direct CP
violation.
  A successful approximate isospin sum rule is rearranged and reinterpreted to
pinpoint tree-penguin interference in $B \to K \pi$ and $B \to K \rho$
transitions. The magnitude of the interference is shown to still be at the
statistical noise level with present data.


title: Aspects of U_A(1) breaking in the Nambu and Jona-Lasinio model

abstract:
  The six-quark instanton induced 't Hooft interaction, which breaks the
unwanted U_A (1) symmetry of QCD, is a source of perturbative corrections to
the leading order result formed by the four-quark forces with the U_L(3)X
U_R(3) chiral symmetry. A detailed quantitative calculation is carried out to
bosonize the model by the functional integral method. We concentrate our
efforts on finding ways to integrate out the auxiliary bosonic variables. The
functional integral over these variables cannot be evaluated exactly. We show
that the modified stationary phase approach leads to a resummation within the
perturbative series and calculate the integral in the ``two-loop''
approximation. The result is a correction to the effective mesonic Lagrangian
which may be important for the low-energy spectrum and dynamics of the scalar
and pseudoscalar nonets.


title: Percolation Effects in Very High Energy Cosmic Rays

abstract:
  Most QCD models of high energy collisions predict that the inelasticity $K$
is an increasing function of the energy. We argue that, due to percolation of
strings, this behaviour will change and, at $\sqrt{s} \simeq 10^4$ GeV, the
inelasticity will start to decrease with the energy. This has straightforward
consequences in high energy cosmic ray physics: 1) the relative depth of the
shower maximum $\bar{X}$ grows faster with energy above the knee; 2) the energy
measurements of ground array experiments at GZK energies could be
overestimated.


title: A parameterisation of single and multiple muons in the deep water or ice

abstract:
  Atmospheric muons play an important role in underwater/ice neutrino
detectors. In this paper, a parameterisation of the flux of single and multiple
muon events, their lateral distribution and of their energy spectrum is
presented. The kinematics parameters were modelled starting from a full Monte
Carlo simulation of the interaction of primary cosmic rays with atmospheric
nuclei; secondary muons reaching the sea level were propagated in the deep
water. The parametric formulas are valid for a vertical depth of 1.5-5 km w.e.
and up to 85 deg for the zenith angle, and can be used as input for a fast
simulation of atmospheric muons in underwater/ice detectors.


title: Gamma Rays from Heavy Neutralino Dark Matter

abstract:
  We consider the gamma-ray spectrum from neutralino dark matter annihilations
and show that internal bremsstrahlung of W pair final states gives a previously
neglected source of photons at energies near the mass of the neutralino. For
masses larger than about 1 TeV, and for present day detector resolutions, this
results in a characteristic signal that may dominate not only over the
continuous spectrum from W fragmentation, but also over the \gamma-\gamma and
\gamma-Z line signals which are known to give large rates for heavy
neutralinos. Observational prospects thus seem promising.


title: Electroweak-Higgs Unification and the Higgs Boson Mass

abstract:
  We propose an alternative unification scenario where the Higgs self-coupling
(lambda) is unified with the electroweak SU(2)L x U(1)Y interactions at an
intermediate scale MGH, lower than the GUT scale. In this model the SM remains
valid up to this scale MGH, where the gauge and Higgs couplings satisfy the
unification condition g1 = g2 = f(lambda). Two variants for this unification
condition are discussed; scenario I is defined through the linear relation: g1
= g2 = k lambda(MGH), while scenario II assumes a quadratic relation: g1**2 =
g2**2 = k lambda(MGH). An attractive feature of this class of models is the
possibility to determine the SM Higgs boson mass by evolving lambda back from
MGH down to the electroweak scale; fixing k = O(1) we obtain a Higgs mass value
mH approx. 200 GeV. Above MGH, the single coupling gH that describes the
electroweak-Higgs interactions, keeps evolving until it unifies with the strong
coupling constant. We discuss a realization o this unification scenario within
the context of a six-dimensional SU(3)c x SU(3)w Gauge-Higgs unified model.


title: K -> pi gamma decays and space-time noncommutativity

abstract:
  We propose the K -> pi gamma decay mode as a signature of the violation of
the Lorentz invariance and the appearance of new physics via space-time
noncommutativity.


title: Resolving ambiguities in mass determinations at future colliders

abstract:
  The measurements of kinematical endpoints, in cascade decays of
supersymmetric particles, in principle allow for a determination of the masses
of the unstable particles. However, in this procedure ambiguities often arise.
We here illustrate how such ambiguities arise. They can be resolved by a
precise determination of the LSP mass, provided by the Linear Collider.


title:
Dark Matter And $B_s \to \mu^+ \mu^-$ With Minimal $SO_{10}$ Soft SUSY
  Breaking II

abstract:
  We update and extend to larger masses our previous analysis of the MSSM with
minimal $SO_{10}$ [MSO$_{10}$SM] soft SUSY breaking boundary conditions. We
find a well--defined, narrow region of parameter space which provides the
observed relic density of dark matter, in a domain selected to fit precision
electroweak data, including top, bottom and tau masses. The model is highly
constrained which allows us to make several predictions. We find the light
Higgs mass $m_h \leq 121 \pm 3$ GeV and also upper bounds on the mass of the
gluino $\mgluino\lsim3.1$ TeV and lightest neutralino $\mchi\lsim450$ GeV. As
the CP odd Higgs mass $m_A$ increases, the region of parameter space consistent
with WMAP data is forced to larger values of $M_{1/2}$ and smaller values of
$m_h$. Hence, we find an upper bound $m_A \lsim 1.3$ TeV. This in turn leads to
lower bounds on ${\rm BR}(B_s\to \mu^+ \mu^-) > 10^{-8}$ (assuming minimal
flavor violation) and on the dark matter spin independent detection cross
section $\sigsip > 10^{-9}$ pb. Finally, we extend our previous analysis to
include WIMP signals in indirect detection and find prospects for WIMP
detection generally much less promising than in direct WIMP searches.


title: Right-handed Neutrino Fields are Real Spinors

abstract:
  The ansatz that the right-handed neutrino fields are real spinors is proposed
in this letter. We naturally explain why the right-handed neutrinos don't feel
the electroweak interactions and why there is neutrino mixing. It is found that
the Majorana representation of Dirac equation is uniquely permitted in our
scenario. With this ansatz, we predict that: 1. there are at least four species
of neutrinos; 2. the mass matrix of neutrinos must be traceless; 3. there is CP
violation in the lepton sector. The difference between our scenario and the Zee
model is discussed also.


title: Supersymmetric Theories of Neutrino Dark Energy

abstract:
  We present a supersymmetric model of dark energy from Mass Varying Neutrinos
which is stable against radiative corrections to masses and couplings, and free
of dynamical instabilities. This is the only such model of dark energy
involving fields with significant couplings to any standard model particle. We
briefly discuss consequences for neutrino oscillations and solar neutrinos.


title: Exotic Axions

abstract:
  We show that axion phenomenology may be significantly different than
conventionally assumed in theories which exhibit late phase transitions (below
the QCD scale). In such theories one can find multiple pseudoscalars with
axion-like couplings to matter, including a string scale axion, whose decay
constant far exceeds the conventional cosmological bound. Such theories have
several dark matter candidates.


title: High-enegy effective action from scattering of QCD shock waves

abstract:
  At high energies, the relevant degrees of freedom are Wilson lines - infinite
gauge links ordered along straight lines collinear to the velocities of
colliding particles. The effective action for these Wilson lines is determined
by the scattering of QCD shock waves. I develop the symmetric expansion of the
effective action in powers of strength of one of the shock waves and calculate
the leading term of the series. The corresponding first-order effective action,
symmetric with respect to projectile and target, includes both up and down fan
diagrams and pomeron loops.


title:
Time-Independent Measurements of D0-D0bar Mixing and Relative Strong
  Phases Using Quantum Correlations

abstract:
  Due to quantum correlations in the C=-1 and C=+1 D0 D0bar pairs produced in
the reactions e+ e- --> D0 D0bar (n pi0) and e+ e- --> D0 D0bar gamma (n pi0),
respectively, the time-integrated D0 D0bar decay rates are sensitive to
interference between amplitudes for indistinguishable final states. The size of
this interference is governed by the relevant amplitude ratios and can include
contributions from D0-D0bar mixing. We present a method for simultaneously
measuring the magnitudes and phases of these amplitude ratios and searching for
D0-D0bar mixing. We make use of fully- and partially-reconstructed D0 D0bar
pairs in both C eigenstates. Our method is insensitive to CP violation, and we
estimate experimental sensitivities based on a plausible charm factory dataset.
Similar analyses can be applied to coherent K0 K0bar, B0 B0bar, or Bs Bsbar
pairs.


title: A Relativistic Description of Hadronic Decays of the Meson $\pi_{1}$

abstract:
  The subject of this work is the analysis of hadronic decays of the exotic
meson $\pi_{1}$ in a fully relativistic formalism, and comparison with the
nonrelativistic results. The relativistic spin wave functions of mesons and
hybrids are constructed based on unitary representations of the Lorentz group.
The radial wave functions are obtained from phenomenological considerations of
the mass operator. We find that the decay channels $\pi b_{1}$ and $\pi f_{1}$
are favored, in agreement with the results obtained using other models, thus
indicating some model independence of the S+P selection rules.


title:
A Relativistic Description of Hadronic Decays of the Exotic Meson
  $\pi_{1}$

abstract:
  Exotic mesons are striking predictions of quantum chromodynamics that go
beyond the quark model. They can provide great insight into understanding
phenomena such as asymptotic freedom, confinement, and dynamical symmetry
breaking. This work analyzes hadronic decays of exotic mesons, with a focus on
the lightest one, the $J^{PC}=1^{-+}$ $\pi_{1}$, in a fully relativistic
formalism. The relativistic spin wave functions of normal and exotic mesons are
constructed based on unitary representations of the Poincare group. The radial
wave functions are obtained from phenomenological considerations of the mass
operator. We find that fully relativistic results using Wigner rotations differ
significantly from nonrelativistic ones. Moreover, the S+P selection rule is
also satisfied in relativistic formalism. Final state interactions do not
change these results much.


title: D and D_{S} decay constants from QCD duality at three loops

abstract:
  We compute the decay constants of the pseudoscalar mesons D and D_{s} using a
linear combination of finite energy sum rules which minimize the contribution
of the unknown continuum spectral function. We employ the recent three loop
calculation of the pseudoscalar two-point function expanded in powers of the
running charm quark mass. The theoretical uncertainties arising from the QCD
asymptotic expansion are quite relevant in this case due to the relative small
scale of the charm mass. We obtain the following results: f_{D}=177 \pm 21 MeV
and f_{D_{s}}=205 \pm 22 MeV. These results, within the error bars, are in good
agreement with estimates obtained using Borel transform QCD sum rules, but
somewhat smaller than results of recent lattice computations.


title:
Polarization transfer measurements of proton form factors: deformation
  by initial collinear photons

abstract:
  It is demonstrated that an emission of collinear photons by the polarized
initial electron in elastic electron-proton polarization transfer scattering
leads to an apparent shifting of real events with small momentum transfer into
the data sample with large momentum transfer. Effectively this shows a fictive
enhancement of the cross section at large momentum transfer. However, the
enhancement is different for transverse and longitudinal polarizations of the
recoil proton. The former is responsible for a deformation of results when
extracting the proton electromagnetic form factors ratio from the data on
electron-proton polarization transfer scattering. Nevertheless, this effect
does not explain the suppression of the Dirac form factor at large momentum
transfer completely.


title:
Prompt photon hadroproduction at high energies in the k_T-factorization
  approach

abstract:
  We consider the prompt photon production at high energy hadron colliders in
the framework of k_T-factorization approach. The unintegrated quark and gluon
distributions in a proton are determined using the Kimber-Martin-Ryskin
prescription. The conservative error analisys is performed. We investigate both
inclusive prompt photon and prompt photon and associated muon production rates.
In Standard Model such events come mainly due to Compton scattering process
where the final heavy (charm or bottom) quark produces a muon. The theoretical
results are compared with recent experimental data taken by the D0 and CDF
collaborations at Fermilab Tevatron. Our analysis also covers the azimuthal
correlations between produced prompt photon and muon which can provide an
important information about non-collinear parton evolution in a proton.
Finally, we extrapolate the theoretical predictions to CERN LHC energies.


title:
Comparison of NNLO DIS scheme splitting functions with results from
  exact gluon kinematics at small x

abstract:
  We consider the effect of exact gluon kinematics in the virtual photon-gluon
impact factor at small x. By comparing with fixed order DIS scheme splitting
and coefficient functions, we show that the exact kinematics results match the
fixed order results well at each order, which suggests that they allow for an
accurate NLL analysis of proton structure functions. We also present, available
for the first time, x-space parameterisations of the NNLO DGLAP splitting
functions in the DIS scheme, and also the longitudinal coefficients for neutral
current scattering.


title:
Big-Bang Nucleosynthesis with Unstable Gravitino and Upper Bound on the
  Reheating Temperature

abstract:
  We study the effects of the unstable gravitino on the big-bang
nucleosynthesis. If the gravitino mass is smaller than \sim 10 TeV, primordial
gravitinos produced after the inflation are likely to decay after the big-bang
nucleosynthesis starts, and the light element abundances may be significantly
affected by the hadro- and photo-dissociation processes as well as by the p n
conversion process. We calculate the light element abundances and derived upper
bound on the reheating temperature after the inflation. In our analysis, we
calculate the decay parameters of the gravitino (i.e., lifetime and branching
ratios) in detail. In addition, we performed a systematic study of the hadron
spectrum produced by the gravitino decay, taking account of all the hadrons
produced by the decay products of the gravitino (including the daughter
superparticles). We discuss the model-dependence of the upper bound on the
reheating temperature.


title: Highly Excited Hadrons in QCD and Beyond

abstract:
  I discuss two issues related to high "radial" excitations which attracted
much attention recently: (i) chiral symmetry restoration in excited mesons and
baryons, and (ii) universality of the rho-meson coupling in QCD and AdS/QCD.
New results are reported and a curious relation between an AdS/QCD formula and
1977 Migdal's proposal is noted.


title: Ginzburg-Landau approach to the three flavor LOFF phase of QCD

abstract:
  We explore, using a Ginzburg-Landau expansion of the free energy, the
Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) phase of QCD with three flavors, using
the NJL four-fermion coupling to mimic gluon interactions. We find that, below
the point where the QCD homogeneous superconductive phases should give way to
the normal phase, Cooper condensation of the pairs u-s and d-u is possible, but
in the form of the inhomogeneous LOFF pairing.


title:
Photon Irradiated Compression as a Tool of Investigating Fundamental
  Physics beyond Standard Model

abstract:
  We clarify how intense laser irradiation leads to an enhancement of rare
processes that may occur within atoms. Non-perturbative calculation using a
coherent laser beam gives an exact, time dependent formula of the enhancement
factor in the large power limit. A high quality laser may provide a new tool of
experimentally investigating physics far beyond the standard model of particle
physics such as lepton and baryon nonconservation.


title: Improved $\alpha^4$ Term of the Electron Anomalous Magnetic Moment

abstract:
  We report a new value of electron $g-2$, or $a_e$, from 891 Feynman diagrams
of order $\alpha^4$. The FORTRAN codes of 373 diagrams containing closed
electron loops have been verified by at least two independent formulations. For
the remaining 518 diagrams, which have no closed lepton loop, verification by a
second formulation is not yet attempted because of the enormous amount of
additional work required. However, these integrals have structures that allow
extensive cross-checking as well as detailed comparison with lower-order
diagrams through the renormalization procedure. No algebraic error has been
uncovered for them. The numerical evaluation of the entire $\alpha^4$ term by
the integration routine VEGAS gives $-1.7283 (35) (\alpha/\pi)^4$, where the
uncertainty is obtained by careful examination of error estimates by VEGAS.
This leads to $a_e = 1 159 652 175.86 (0.10) (0.26) (8.48) \times 10^{-12}$,
where the uncertainties come from the $\alpha^4$ term, the estimated
uncertainty of $\alpha^5$ term, and the inverse fine structure constant,
$\alpha^{-1} = 137.036 000 3 (10)$, measured by atom interferometry combined
with a frequency comb technique, respectively. The inverse fine structure
constant $\alpha^{-1} (a_e)$ derived from the theory and the Seattle
measurement of $a_e$ is $137.035 998 83 (51)$.


title:
Angular distribution of Drell-Yan process at hadron colliders to NLO-QCD
  in models of TeV scale gravity

abstract:
  In TeV scale gravity models, for dilepton production at hadron colliders, we
present the NLO-QCD corrections for the double differential cross section in
the invariant mass and scattering angle. For both ADD and RS models, the
quantitative impact of QCD corrections for extra dimension searches at LHC and
Tevatron are investigated. We present the K-factors for both ADD and RS models
at LHC and Tevatron. Inclusion of QCD corrections to NLO stabilises the cross
section with respect to scale variations.


title: Theoretical review of diffractive phenomena

abstract:
  We review QCD based descriptions of diffractive deep inelastic scattering
emphasising the role of models with parton saturation. These models provide
natural explanation of such experimentally observed facts as the constant ratio
of the diffractive and total cross sections as a function of the Bjorken
variable, and Regge factorization of diffractive parton distributions. The
Ingelman-Schlein model and the soft color interaction model are also presented.


title: The Freezeout Parameters in Heavy-Ion Collisions

abstract: This paper is temporarily withdrawn by author


title:
Fit to Moments of Inclusive B->Xc lv and B-> Xs gamma Decay
  Distributions using Heavy Quark Expansions in the Kinetic Scheme

abstract:
  We present a fit to measured moments of inclusive distributions in B->Xc lv
and B-> Xs gamma decays to extract values for the CKM matrix element |Vcb|, the
b- and c-quark masses, and higher order parameters that appear in the Heavy
Quark Expansion. The fit is carried out using theoretical calculations in the
kinetic scheme and includes moment measurements of the Babar, Belle, CDF, CLEO
and DELPHI collaborations for which correlation matrices have been published.
We find |Vcb| = (41.96 +- 0.23(exp) +- 0.35(HQE) +- 0.59(Gamma_SL)) 10^-3 and
m_b = 4.590 +- 0.025(exp) +- 0.30(HQE) GeV where errors are experimental and
theoretical respectively. We also derive values for the heavy quark
distribution function parameters m_b and \mu_\pi^2 in different theoretical
schemes that can be used as input for the determination of |Vub|.


title: Scaling of Dirac Fermions and the WKB approximation

abstract:
  We discuss a new method for obtaining the WKB approximation to the Dirac
equation with a scalar potential and a time-like vector potential. We use the
WKB solutions to investigate the scaling behavior of a confining model for
quark-hadron duality. In this model, a light quark is bound to a heavy di-quark
by a linear scalar potential. Absorption of virtual photons promotes the quark
to bound states. The analog of the parton model for this case is for a virtual
photon to eject the bound, ground-state quark directly into free continuum
states. We compare the scaling limits of the response functions for these two
transitions.


title:
Neutrino and graviton rest mass estimations by a phenomenological
  approach

abstract:
  The ratio between the proton and electron masses is shown to be close to the
ratio between the strong and electromagnetic interaction coupling constants at
Extremely Low Energy (ELE). Based on the experimental data, this relation has
been extended for the weak and gravitational interactions, too. Thus, a mass
relation has been found, according to which the rest mass of the Lightest Free
Massive Stable Particle (LFMSP), acted upon by a particular interaction, is
proportional to the coupling constant of the respective interaction at ELE. On
the basis of this mass relation, the electron neutrino and graviton masses have
been approximately estimated to 2.1x10^(-4) eV/c^2 and 2.3x10^(-34) eV/c^2,
respectively. The last value is of the order of the magnitude of hbar*H/c^2,
where H is the Hubble constant and hbar is the reduced Planck constant. It is
worth noting that this value has been obtained by fundamental constants only,
without consideration of any cosmological models.


title:
Study of the strong $\Sigma_c\to \Lambda_c \pi$, $\Sigma_c^{*}\to
  \Lambda_c \pi$ and $\Xi_c^{*}\to \Xi_c \pi$ decays in a nonrelativistic quark
  model

abstract:
  We present results for the strong widths corresponding to the $\Sigma_c\to
\Lambda_c \pi$, $\Sigma_c^{*}\to \Lambda_c \pi$ and $\Xi_c^{*}\to \Xi_c \pi$
decays. The calculations have been done in a nonrelativistic constituent quark
model with wave functions that take advantage of the constraints imposed by
heavy quark symmetry. Partial conservation of axial current hypothesis allows
us to determine the strong vertices from an analysis of the axial current
matrix elements. Our results \hbox{$\Gamma(\Sigma_c^{++}\to \Lambda_c^+
\pi^+)=2.41 \pm0.07\pm0.02 \mathrm{MeV}$}, {$\Gamma(\Sigma_c^{+}\to \Lambda_c^+
\pi^0)=2.79 \pm0.08\pm0.02 \mathrm{MeV}$}, {$\Gamma(\Sigma_c^{0}\to \Lambda_c^+
\pi^-)=2.37 \pm0.07\pm0.02 \mathrm{MeV}$}, {$\Gamma(\Sigma_c^{* ++}\to
\Lambda_c^+ \pi^+)=17.52\pm0.74\pm0.12 \mathrm{MeV}$}, {$\Gamma(\Sigma_c^{*
+}\to \Lambda_c^+ \pi^0)=17.31\pm0.73\pm0.12 \mathrm{MeV}$},
{$\Gamma(\Sigma_c^{* 0}\to \Lambda_c^+ \pi^-)=16.90\pm0.71\pm0.12
\mathrm{MeV}$}, {$\Gamma(\Xi_c^{* +}\to \Xi_c^0
\pi^++\Xi_c^+\pi^0)=3.18\pm0.10\pm0.01 \mathrm{MeV}$} and {$\Gamma(\Xi_c^{*
0}\to \Xi_c^+ \pi^-+\Xi_c^0\pi^0)=3.03\pm0.10\pm0.01 \mathrm{MeV}$} are in good
agreement with experimental determinations.


title: Hierarchy from Baryogenesis

abstract:
  We study a recently proposed mechanism to solve the hierarchy problem in the
context of the landscape, where the solution of the hierarchy problem is
connected to the requirement of having baryons in our universe via Electroweak
Baryogenesis. The phase transition is triggered by the fermion condensation of
a new gauge sector which becomes strong at a scale Lambda determined by
dimensional transmutation, and it is mediated to the standard model by a new
singlet field. In a ``friendly'' neighborhood of the landscape, where only the
relevant operators are ``scanned'' among the vacua, baryogenesis is effective
only if the higgs mass m_h is comparable to this low scale Lambda, forcing m_h
to be of order Lambda, and solving the hierarchy problem. A new CP violating
phase is needed coupling the new singlet and the higgs field to new matter
fields. We study the constraints on this model given by baryogenesis and by the
electron electric dipole moment (EDM), and we briefly comment on gauge coupling
unification and on dark matter relic abundance. We find that next generation
experiments on the EDM will be sensitive to essentially the entire viable
region of the parameter space, so that absence of a signal would effectively
rule out the model.


title:
Soliton solutions in an effective action for SU(2) Yang-Mills theory:
  including effects of higher-derivative term

abstract:
  The Skyrme-Faddeev-Niemi (SFN) model which is an O(3) $\sigma$ model in three
dimensional space upto fourth-order in the first derivative is regarded as a
low-energy effective theory of SU(2) Yang-Mills theory. One can show from the
Wilsonian renormalization group argument that the effective action of
Yang-Mills theory recovers the SFN in the infrared region. However, the thoery
contains an additional fourth-order term which destabilizes the soliton
solution. In this paper, we derive the second derivative term perturbatively
and show that the SFN model with the second derivative term possesses soliton
solutions.


title: Electroweak baryogenesis and the triple Higgs boson coupling

abstract:
  We study collider signatures of electroweak baryogenesis in the two Higgs
doublet model and the minimal supersymmetric standard model. It is found that
the trilinear coupling of the lightest Higgs boson receives large quantum
corrections if the electroweak phase transition is strongly first order for
successful baryogenesis. In the two Higgs doublet model, the magnitude of the
deviation from the standard model value is shown to be larger than 10 percent.
Such a deviation can be detected at a future electron-positron linear collider.


title: Neutrinoless double beta decay and neutrino mass hierarchies

abstract:
  In the framework of the see-saw mechanism the normal hierarchy is favorable
for the neutrino mass spectrum. For this spectrum we present a detailed
calculation of the half-lives of neutrinoless double beta decay for several
nuclei of experimental interest. The half-lives are evaluated by considering
the most comprehensive nuclear matrix elements, which were obtained within the
renormalized QRPA by the Bratislava-Caltech-Tuebingen group. The dependence of
the half-lives on sin^2 theta_{13}$ and the lightest neutrino mass is studied.
We present also the results of the calculations of the half-lives of
neutrinoless double beta decay in the case of the inverted hierarchy of
neutrino masses.


title: Deeply virtual vector meson electroproduction at small Bjorken-x

abstract:
  It is reported on an analysis of vector meson electroproduction at small
Bjorken-x within the handbag approach. Using a model for the generalized parton
distribution and calculating the partonic subprocess, electroproduction off
gluons, within the modified perturbative approach, cross sections and spin
density matrix elements are evaluated. The numerical results agree fairly well
with recent HERA data.


title:
NLO forward-backward charge asymmetries in p p (p bar p) -> l- l+ jet
  production at large hadron colliders

abstract:
  We consider the next-to-leading order corrections, O(alpha_s), to
forward-backward charge asymmetries for lepton-pair production in association
with a large transverse momentum jet at large hadron colliders. We find that
the leading order results are essentially confirmed. Although experimentally
challenging and in practice with large backgrounds, these observables could
provide a new determination of the weak mixing angle sin2 theta^lept_eff
(M_Z^2) with a statistical precision for each lepton flavour of ~10^(-3) (7 x
10^{-3}) at LHC (Tevatron), and if b jets are identified, of the b quark Z
asymmetry A^b_{FB} with a statistical precision of ~ 2x10^{-3} (4x10{-2}) at
LHC (Tevatron).


title: Dark matter and Colliders searches in the MSSM

abstract:
  We study the complementarity between dark matter experiments (direct
detection and indirect detections) and accelerator facilities (the CERN LHC and
a $\sqrt{s}= 1$ TeV $e^+e^-$ Linear Collider) in the framework of the
constrained Minimal Supersymmetric Standard Model (MSSM). We show how
non--universality in the scalar and gaugino sectors can affect the experimental
prospects to discover the supersymmetric particles. The future experiments will
cover a large part of the parameter space of the MSSM favored by WMAP
constraint on the relic density, but there still exist some regions beyond
reach for some extreme (fine tuned) values of the supersymmetric parameters.
Whereas the Focus Point region characterized by heavy scalars will be easily
probed by experiments searching for dark matter, the regions with heavy
gauginos and light sfermions will be accessible more easily by collider
experiments. More informations on both supersymmetry and astrophysics
parameters can be thus obtained by correlating the different signals.


title:
Phase effects from the general neutrino Yukawa matrix on lepton flavor
  violation

abstract:
  We examine contributions from Majorana phases to lepton flavor violating
processes in the framework of the minimal supersymmetric standard model with
heavy right-handed neutrinos. All phases in the complex neutrino Yukawa matrix
are taken into account in our study. We find that in the scenario with
universal soft-breaking terms sizable phase effects can appear on the lepton
flavor violating processes such as $\mu \to e \gamma$, $\tau \to e \gamma$, and
$\tau \to \mu \gamma$. In particular, the branching ratio of $\mu \to e \gamma$
can be considerably enhanced due to the Majorana phases, so that it can be much
greater than that of $\tau \to \mu \gamma$.


title: Pion Electromagnetic Form Factor up to 10 [GeV/]^2

abstract:
  The light-front approach is applied to calculate the electromagnetic current
for quark-antiquark bound states for the pion. The pion electromagnetic form
factor is obtnaide from the "+" and "-" components of the electromagnetic
current in the Drell-Yan frame, with different models of the pi-q\bar{q} vertex
and the results for the pion electromagnetic form factor are compared with the
experimental data up to 10 [GeV/c]^2 and anothers hadronic models. The
rotational symmetry propreties of the pion electromagnetic current related with
the zero-modes in the light-front are investigate.


title: Single-Transverse Spin Asymmetries: From DIS to Hadronic Collisions

abstract:
  We study single-spin asymmetries in semi-inclusive deep inelastic scattering
with transversely polarized target. Based on the QCD factorization approach, we
consider Sivers and Collins contributions to the asymmetries. We fit simple
parameterizations for the Sivers and Collins functions to the recent HERMES
data, and compare to results from COMPASS. Using the fitted parameterizations
for the Sivers functions, we predict the single transverse spin asymmetries for
various processes in $pp$ collisions at RHIC, including the Drell-Yan process
and angular correlations in dijet and jet-plus-photon production. These
asymmetries are found to be sizable at forward rapidities


title: Phenomenology of the Baryon Resonance 70-plet at Large N_c

abstract:
  We examine the multiplet structure and decay channels of baryon resonances in
the large N_c QCD generalization of the N_c = 3 SU(6) spin-flavor 70. We show
that this ``70'', while a construct of large N_c quark models, actually
consists of five model-independent irreducible spin-flavor multiplets in the
large N_c limit. The preferred decay modes for these resonances fundamentally
depend upon which of the five multiplets to which the resonance belongs. For
example, there exists an SU(3) ``8'' of resonances that is eta-philic and
pi-phobic, and an ``8'' that is the reverse. Moreover, resonances with a strong
SU(3) ``1'' component prefer to decay via a K-bar rather than via a pi.
Remarkably, available data appears to bear out these conclusions.


title: Rescattering effects in hadron-nucleus and heavy-ion collisions

abstract:
  We review the extension of the factorization formalism of perturbative QCD to
{\it coherent} soft rescattering associated with hard scattering in high energy
nuclear collisions. We emphasize the ability to quantify high order corrections
and the predictive power of factorization approach in terms of universal
nonperturbative matrix elements. Although coherent rescattering effects are
power suppressed by hard scales of the scattering, they are enhanced by the
nuclear size and could play an important role in understanding the novel
nuclear dependence observed in high energy nuclear collisions.


title: Secondary pairing in gapless color-superconducting quark matter

abstract:
  We calculate secondary pairing in a model of a color superconductor with a
quadratic gapless dispersion relation for the quasiquarks of the primary
pairing. Our model mimics the physics of the sector of blue up and red strange
quarks in gapless color-flavor-locked quark matter. The secondary pairing opens
up a gap Delta_s in the quark spectrum, and we confirm Hong's prediction that
in typical secondary channels Delta_s is proportional to G_s^2 for coupling
strength G_s. This shows that the large density of states of the quadratically
gapless mode greatly enhances the secondary pairing over the standard BCS
result, in which Delta is proportional to exp(-const/G). In all of the
secondary channels that we analyzed we find that the secondary gap, even with
this enhancement, is from ten to hundreds of times smaller than the primary gap
at reasonable values of the secondary coupling, indicating that secondary
pairing does not generically resolve the magnetic instability of the gapless
phase.


title: B-Meson Wavefunction with Contributions from 3-particle Fock States

abstract:
  The B-meson light-cone wavefunctions, $\Psi_{\pm}(\omega,z^2)$, are
investigated up to the next-to-leading order in Fock state expansion in the
heavy quark limit. In order to know the transverse momentum dependence of the
B-meson wavefunctions with 3-particle Fock states' contributions, we make use
of the relations between 2- and 3- particle wavefunctions derived from the QCD
equations of motion and the heavy quark symmetry, especially two constraints
derived from the gauge field equation of motion are employed. Our results show
that the use of gluon equation of motion can give a constraint on the
transverse momentum dependence $\chi(\omega,\mathbf{k}_\perp)$ of the B-meson
wavefunctions, whose distribution tends to be a hyperbola-like curve under the
condition $0<c_1<1$, which is quite different from the WW type wavefunctions,
whose transverse momentum dependence $\chi^{WW}(\omega,\mathbf{k}_\perp)$ is
merely a delta function. Based on the derived results, we propose a simple
model for the B-meson wavefunctions with 3-particle Fock states' contributions.


title: Color Neutral Ground State of 2SC Quark Matter

abstract:
  We construct a new color neutral ground state of two-flavor color
superconducting quark matter. It is shown that, in contrast with the
conventionally considered ground state with diquark pairing in only one color
direction, this new state is stable against arbitrary diquark fluctuations. In
addition, the thermodynamical potential is found to be lower for this new state
than for the conventional one.


title: One-scale Model for Domain Wall Network Evolution

abstract:
  We introduce a new phenomenological one-scale model for the evolution of
domain wall networks, and test it against high-resolution field theory
numerical simulations. We argue that previous numerical estimates of wall
velocities are inaccurate, and suggest a more accurate method of measurement.
We show that the model provides an adequate approximation to the evolution of
key parameters characterizing the evolution of the network. We use the model to
study possible scaling solutions for domain wall networks, and discuss some of
their cosmological consequences.


title: Nearly Conformal QCD and AdS/CFT

abstract:
  The AdS/CFT correspondence is a powerful tool to study the properties of
conformal QCD at strong coupling in terms of a higher dimensional dual gravity
theory. The power-law falloff of scattering amplitudes in the non-perturbative
regime and calculable hadron spectra follow from holographic models dual to QCD
with conformal behavior at short distances and confinement at large distances.
String modes and fluctuations about the AdS background are identified with QCD
degrees of freedom and orbital excitations at the AdS boundary limit. A
description of form factors in space and time-like regions and the behavior of
light-front wave functions can also be understood in terms of a dual gravity
description in the interior of AdS.


title: Refinements in Effective Potential Calculations in the MSSM

abstract:
  The one-loop effective potential is a powerful tool in studying the
electroweak symmetry breaking of supersymmetric theories, whose precise
calculation may have important phenomenological consequences. In this work, we
are correctly treating the contribution of the Higgs sector to the effective
potential and refine the radiative corrections to the Higgs mixing parameter
$\mu$, which is known to affect greatly the supersymmetric spectrum. Working at
the average stop scale to minimize the effect of the stop sector, we find
additional corrections which can play a dominant role in the Focus Point region
of the parameter space of the MSSM. The comparison of our results with those of
the literature is discussed. We also discuss the gauge dependence of the
effective potential and its effect on the $\mu$ parameter in analyses where
this is determined from the 1-loop minimization conditions of the effective
potential.


title:
Excited charmonium mesons production in e^+e^- annihilation at
  \sqrt{s}=10.6 GeV

abstract:
  In this paper the production of excited vector and pseudoscalar charmonium
mesons in $\epem$ annihilation is analyzed in the framework of light cone. In
particular the cross sections $\epem \to \psi(2S)\eta_c(1S),
\psi(1S)\eta_c(2S),\psi(2S)\eta_c(2S)$ have been calculated. It is shown, that
contrary to NRQCD the cross sections calculated in the framework of light cone
agree with experimental data.


title:
System-size dependence of strangeness production in high-energy A+A
  collisions and percolation of strings

abstract:
  We argue that the shape of the system-size dependence of strangeness
production in nucleus-nucleus collisions can be understood in a picture that is
based on the formation of clusters of overlapping strings. A string percolation
model combined with a statistical description of the hadronization yields a
quantitative agreement with the data at $\sqrt{s_{NN}}=17.3$ GeV. The model is
also applied to RHIC energies.


title: Nucleon polarizabilities in the perturbative chiral quark model

abstract:
  The nucleon polarizabilities alpha(E) and beta(M) are studied in the context
of the perturbative chiral quark model. We demonstrate that meson cloud effects
are sufficient to explain the electric polarizability of nucleon. Contributions
of excite quark states to the paramagnetic polarizability are dominant and
cancel the diamagnetic polarizability arising from the chiral field. The
obtained results are compared to data and other theoretical predictions.


title: Running couplings for the simultaneous decoupling of heavy quarks

abstract:
  Scale-invariant running couplings are constructed for several quarks being
decoupled together, without reference to intermediate thresholds.
Large-momentum scales can also be included. The result is a multi-scale
generalization of the renormalization group applicable to any order.
Inconsistencies in the usual decoupling procedure with a single running
coupling can then be avoided, e.g. when cancelling anomalous corrections from
t,b quarks to the axial charge of the proton.


title: Thermal leptogenesis in brane world cosmology

abstract:
  The thermal leptogenesis in brane world cosmology is studied. In brane world
cosmology, the expansion law is modified from the four-dimensional standard
cosmological one at high temperature regime in the early universe. As a result,
the well-known upper bound on the lightest light neutrino mass induced by the
condition for the out-of-equilibrium decay of the lightest heavy neutrino,
$\tilde{m}_1 \lesssim 10^{-3}$ eV, can be moderated to be $\tilde{m}_1 \lesssim
10^{-3} {eV} \times (M_1/T_t)^2 $ in the case of $T_t \leq M_1$ with the
lightest heavy neutrino mass ($M_1$) and the ``transition temperature''
($T_t$), at which the modified expansion law in brane world cosmology is
smoothly connecting with the standard one. This implies that the degenerate
mass spectrum of the light neutrinos can be consistent with the thermal
leptogenesis scenario. Furthermore, as recently pointed out, the gravitino
problem in supersymmetric case can be solved if the transition temperature is
low enough $T_t \lesssim 10^{6-7}$ GeV. Therefore, even in the supersymmetric
case, thermal leptogenesis scenario can be successfully realized in brane world
cosmology.


title: Monte Carlo simulation for radiative kaon decays

abstract:
  For high precision measurements of K decays, the presence of radiated photons
cannot be neglected. The Monte Carlo simulations must include the radiative
corrections in order to compute the correct event counting and efficiency
calculations. In this paper we briefly describe a method for simulating such
decays.


title: A toy model for generalised parton distributions

abstract:
  We give the results of a simple model for the diagonal and off-diagonal
valence quark distributions of a pion. We show that structure can be
implemented in a gauge-invariant manner. This explicit model questions the
validityof the momentum sum rule, and gives an explicit counter-example to the
Wandzura-Wilczek ansatz for twist-3 GPD's.


title:
Model Independent Approach to Focus Point Supersymmetry: from Dark
  Matter to Collider Searches

abstract:
  The focus point region of supersymmetric models is compelling in that it
simultaneously features low fine-tuning, provides a decoupling solution to the
SUSY flavor and CP problems, suppresses proton decay rates and can accommodate
the WMAP measured cold dark matter (DM) relic density through a mixed
bino-higgsino dark matter particle. We present the focus point region in terms
of a weak scale parameterization, which allows for a relatively model
independent compilation of phenomenological constraints and prospects. We
present direct and indirect neutralino dark matter detection rates for two
different halo density profiles, and show that prospects for direct DM
detection and indirect detection via neutrino telescopes such as IceCube and
anti-deuteron searches by GAPS are especially promising. We also present LHC
reach prospects via gluino and squark cascade decay searches, and also via
clean trilepton signatures arising from chargino-neutralino production. Both
methods provide a reach out to m_{\tg}\sim 1.7 TeV. At a TeV-scale linear
e^+e^- collider (LC), the maximal reach is attained in the \tz_1\tz_2 or
\tz_1\tz_3 channels. In the DM allowed region of parameter space, a
\sqrt{s}=0.5 TeV LC has a reach which is comparable to that of the LHC.
However, the reach of a 1 TeV LC extends out to m_{\tg}\sim 3.5 TeV.


title: Multi-Dimensional mSUGRA Likelihood Maps

abstract:
  We calculate the likelihood map in the full 7 dimensional parameter space of
the minimal supersymmetric standard model (MSSM) assuming universal boundary
conditions on the supersymmetry breaking terms. Simultaneous variations of m_0,
A_0, M_{1/2}, tan beta, m_t, m_b and alpha_s(M_Z) are applied using a Markov
chain Monte Carlo algorithm. We use measurements of b -> s gamma, (g-2)_mu and
Omega_{DM} h^2 in order to constrain the model. We present likelihood
distributions for some of the sparticle masses, for the branching ratio of
B_s^0 -> mu^+ mu^- and for m_{stau}-m_{chi_1^0}. An upper limit of 2.10^{-8} on
this branching ratio might be achieved at the Tevatron, and would rule out 29%
of the currently allowed likelihood. If one allows for non thermal-neutralino
components of dark matter, this fraction becomes 35%. The mass ordering allows
the important cascade decay squark_L -> chi_2^0 -> slepton_R -> chi_1^0 with a
likelihood of 24+/-4%. The stop coannihilation region is highly disfavoured,
whereas the light Higgs region is marginally disfavoured.


title: Contrasting Supersymmetry and Universal Extra Dimensions at Colliders

abstract:
  We contrast the experimental signatures of low energy supersymmetry and the
model of Universal Extra Dimensions and discuss various methods for their
discrimination at hadron and lepton colliders. We study the discovery reach of
hadron colliders for level 2 Kaluza-Klein modes, which would indicate the
presence of extra dimensions. We also investigate the possibility to
differentiate the spins of the superpartners and KK modes by means of the
asymmetry method of Barr. We then review the methods for discriminating between
the two scenarios at a high energy linear collider such as CLIC. We consider
the processes of Kaluza-Klein muon pair production in universal extra
dimensions in parallel to smuon pair production in supersymmetry. We find that
the angular distributions of the final state muons, the energy spectrum of the
radiative return photon and the total cross-section measurement are powerful
discriminators between the two models.


title: Threshold Resummed Spectra in B -> Xu l nu Decays in NLO (I)

abstract:
  We evaluate thresholds resummed spectra in B -> Xu l nu decays in
next-to-leading order. We present results for the distribution in E_X and in
m_X^2/E_X^2, for the distribution in E_X and E_l and for the distribution in
E_X, where E_X and m_X are the energy and the invariant mass of the final
hadronic state Xu respectively and E_l is the energy of the charged lepton. We
explicitly show that all these spectra (where there is no integration over the
hadronic energy) can be directly related to the photon spectrum in B -> Xs
gamma via short-distance coefficient functions.


title: Small-x Physics: From HERA to LHC and beyond

abstract:
  We summarize the lessons learned from studies of hard scattering processes in
high-energy electron-proton collisions at HERA and antiproton-proton collisions
at the Tevatron, with the aim of predicting new strong interaction phenomena
observable in next-generation experiments at the Large Hadron Collider (LHC).
Processes reviewed include inclusive deep-inelastic scattering (DIS) at small
x, exclusive and diffractive processes in DIS and hadron-hadron scattering, as
well as color transparency and nuclear shadowing effects. A unified treatment
of these processes is outlined, based on factorization theorems of quantum
chromodynamics, and using the correspondence between the "parton" picture in
the infinite-momentum frame and the "dipole" picture of high-energy processes
in the target rest frame. The crucial role of the three-dimensional quark and
gluon structure of the nucleon is emphasized. A new dynamical effect predicted
at high energies is the unitarity, or black disk, limit (BDL) in the
interaction of small dipoles with hadronic matter, due to the increase of the
gluon density at small x. This effect is marginally visible in diffractive DIS
at HERA and will lead to the complete disappearance of Bjorken scaling at
higher energies. In hadron-hadron scattering at LHC energies and beyond (cosmic
ray physics), the BDL will be a standard feature of the dynamics, with
implications for (a) hadron production at forward and central rapidities in
central proton-proton and proton-nucleus collisions, in particular events with
heavy particle production (Higgs), (b) proton-proton elastic scattering, (c)
heavy-ion collisions. We also outline the possibilities for studies of
diffractive processes and photon-induced reactions (ultraperipheral collisions)
at LHC, as well as possible measurements with a future electron-ion collider.


title:
First Order QED Corrections to the Parity-Violating Asymmetry in Moller
  Scattering

abstract:
  We compute a full set of the first order QED corrections to the
parity-violating observables in polarized Moller scattering. We employ a
covariant method of removing infrared divergences, computing corrections
without introducing any unphysical parameters. When applied to the kinematics
of the SLAC E158 experiment, the QED corrections reduce the parity violating
asymmetry by 4.5%. We combine our results with the previous calculations of the
first-order electroweak corrections and obtain the complete O(alpha)
prescription for relating the experimental asymmetry A_LR to the low-energy
value of the weak mixing angle. Our results are applicable to the recent
measurement of A_LR by the SLAC E158 collaboration, as well as to the future
parity violation experiments.