title:
Non-standard neutrino interactions in K^{+}\to\pi^{+}\nu\bar{\nu} and
  D^{+}\to\pi^{+}\nu\bar{\nu} decays

abstract:
  We study the contributions of the non-standard neutrino interactions (NSIs)
to the rare meson decays of $K^{+}\to \pi^{+} \nu\bar{\nu}$ and $D^{+}\to
\pi^{+} \nu\bar\nu$. We show that both decays could provide strong constraints
on the free parameters in the NSIs. We point out that the branching ratio of
$D^{+}\to \pi^{+} \nu\bar\nu$ could be at the level of $10^{-8}$.


title: A pentaquark model of the negative parity Lambda(1405)

abstract:
  We test a pentaquark model of the negative parity hyperon Lambda(1405). We
use the model where valence four quarks and one antiquark move in a potential
relativisticaly and interact with themselves and each other through gluon and
NG boson. We calculate mass shift of the system and find that there are two
Lambda(1405) with almost degenerate mass: one flavor singlet and one flavor
octet. We calclate also sigma-term and scalar form factor of the hyperon and
show their usefulness to deduce the number of valence quark in the hypeon.


title: Phenomenology of jet physics in the BFKL formalism at NLO

abstract:
  We study jet physics in the high energy regime of QCD. Based on the NLO BFKL
equation, we construct a vertex for the production of a jet at central rapidity
in k_T-factorization. A jet algorithm is introduced, and we take special care
of the separation of multi-Regge and quasi-multi-Regge kinematics. The
connection with the energy scale of the evolution is investigated in detail.
The result is discussed for two situations: scattering of highly virtual
photons, which requires a symmetric energy scale to separate the impact factors
from the gluon Green's function, and hadron-hadron collisions, where a
non-symmetric scale choice is needed. For the second case we are able to define
a NLO unintegrated gluon density, valid in the small-x regime, and give the
evolution equation for this density as well.
  In the second part, we examine the angular decorrelation of Mueller-Navelet
jets. Using an operator formalism in the space of anomalous dimension and
conformal spin, we implement the NLO BFKL Green's function to study the
rapidity dependence of angular decorrelations. We incorporate the necessary
summation of collinearly enhanced corrections beyond NLO accuracy. We compare
our results with data from the Tevatron ppbar-collider and provide predictions
for the LHC as well. We also extend our study to the angular decorrelation
between a forward jets and the electron in deep inelastic ep scattering. The
angular decorrelation has not been measured in DIS so far, but we give
theoretical results for this observable which already implement the
experimental cuts.


title: Simulation of Beyond Standard Model Physics in Herwig++

abstract:
  We present a new approach for the simulation of Beyond Standard Model (BSM)
physics within the Herwig++ event generator. Our approach is more generic than
previous methods with the aim of minimising the effort of implementing further
new physics models. Spin correlations, which are important for BSM models due
to new heavy fermions and bosons, are discussed and their effects demonstrated
for the Minimal Supersymmetric Standard Model (MSSM) and Randall-Sundrum Model
using our new framework.


title: The MFV limit of the MSSM for low tan(beta): meson mixings revisited

abstract:
  We apply the effective field theory definition of Minimal Flavour Violation
(MFV) to the MSSM. We explicitly show how, by this definition, the new sources
of flavour and CP violation present in the MSSM become functions of the SM
Yukawa couplings, and cannot be simply set to zero, as is common wisdom in
phenomenological MSSM studies that assume MFV.
  We apply our approach to the MSSM Delta B = 2 Hamiltonian at low tan(beta).
The limit of MFV amounts to a striking increase in the predictivity of the
model. In particular, SUSY corrections to meson-antimeson mass differences
Delta M(d,s) are always found to be positive with respect to the SM prediction.
This feature is due to an interesting interplay between chargino and gluino box
diagrams (the dominant contributions) in the different mass regimes one can
consider.
  Finally, we point out that, due to the presence of gluinos, the MFV MSSM does
not belong -- even at low tan(beta) -- to the class of models with the
so-called `constrained' MFV (CMFV), in which only the SM operator (V-A)x(V-A)
contributes to Delta M(d,s). Consequently, for the MSSM and in the general case
of MFV, one should not use the Universal Unitarity Triangle (UUT), relevant for
CMFV models, but a MFV-UT constructed from beta(psi KS) and |V(ub)| or gamma
from tree level decays. In particular, with the measured value of beta(psi KS),
MFV implies a testable correlation between |V(ub)| and gamma. With the present
high value of |V(ub)|, MFV favours gamma > 80 degrees.


title:
Anomalous Quartic $WW\gamma\gamma$ and $ZZ\gamma\gamma$ Couplings in
  $e\gamma$ Collision With Initial Beams and Final State Polarizations

abstract:
  The constraints on the anomalous quartic $WW\gamma\gamma$ and
$ZZ\gamma\gamma$ gauge boson couplings are investigated through the processes
$e\gamma\to W^{-}\gamma\nu_{e}$ and $e\gamma\to Z\gamma e$. Considering the
longitudinal and transverse polarization states of the final W or Z boson and
incoming beam polarizations we find 95% confidence level limits on the
anomalous coupling parameters $a_{0}$ and $a_{c}$ with an integrated luminosity
of 500 $fb^{-1}$ and $\sqrt{s}$=0.5, 1 TeV energies. Assuming the
$W^{+}W^{-}\gamma\gamma$ couplings are independent of the $ZZ\gamma\gamma$
couplings we show that the longitudinal polarization state of the final gauge
boson improves the sensitivity to anomalous couplings by a factor of 2-3
depending on energy and coupling. An extra enhancement in sensitivity by a
factor of 1.3 comes from a set of initial beam polarizations.


title:
Higgs plus two jet production via gluon fusion as a signal at the CERN
  LHC

abstract:
  Higgs boson production in association with two tagging jets will be mediated
by electroweak vector boson fusion and by gluon fusion processes at the CERN
LHC. The characteristic distributions for the gluon fusion process are analyzed
for the $H\to W^+W^-$ signal at $m_H=160$ GeV, with subsequent leptonic decay
of the $W$-pair. The dominant backgrounds from top-quark pair production,
$WWjj$ production and vector boson fusion processes can be suppressed to a
level of $S/B\approx 1/4$, yielding a highly significant gluon fusion signal
with 30 fb$^{-1}$. Analysis of the azimuthal angle correlations of the two jets
provides for a direct measurement of the CP-nature of the $Htt$ Yukawa coupling
which is responsible for the effective $Hgg$ vertex.


title: On Dyson-Schwinger equations and the number of fermion families

abstract:
  We study Dyson-Schwinger equations for propagators of Dirac fermions
interacting with a massive gauge boson in the ladder approximation. The
equations have the form of the coupled nonlinear integral Fredholm equations of
the second kind in the spacelike domain. The solutions in the timelike domain
are completely defined by evaluations of integrals of the spacelike domain
solutions. We solve the equations and analyze the behavior of solutions on the
mass of the gauge boson, the coupling constant, and the ultraviolet cutoff. We
find that there are at least two solutions for the fixed gauge boson mass,
coupling, and the ultraviolet cutoff, thus there are at least two fermion
families. The zero-node solution represents the heaviest Dirac fermion state,
while the one-node solution is the lighter one. The mass gap between the two
families is of the order of magnitude observed in nature.


title:
D-Dbar mixing and new physics: general considerations and constraints on
  the MSSM

abstract:
  Combining the recently available experimental evidence of D-Dbar mixing, we
extract model-independent information on the mixing amplitude and on its
CP-violating phase. Using this information, we present new constraints on the
flavour structure of up-type squark mass matrices in supersymmetric extensions
of the Standard Model.


title: Decays of the X(3872) and $\chi_{c1}(2P)$ charmonium

abstract:
  We re-examine the re-scattering mechanism for the X(3872), as a candidate for
the 2P charmonium state $\chi_{c1}(2P)$, decaying to $J/\psi\rho(\omega)$
through exchanging $D^{(*)}$ mesons between intermediate states $D(\bar{D})$
and $\bar{D}^*(D^*)$. We evaluate the dispersive part, as well as the
absorptive one, of the re-scattering amplitude and find that the contribution
from the dispersive part is dominant even when X(3872) lies above the threshold
of the neutral channel $th_n=m_{D^0}+m_{D^{*0}}$. We predict
$R_{\rho/\omega}\simeq 1$ for the $m_X$ region scanned by experiments.
Meanwhile, we also estimate the rate of $X\to D^0\bar{D}^{0}\pi^0$. Our results
favor a charmonium interpretation of X(3872) when it lies slightly below the
threshold of $D^0\bar{D}^{*0}$. Furthermore, we evaluated the width of $X\to
J/\psi\rho$ with the help of a phenomenological effective coupling constant
$g_X$, and find the total width of X(3872) to be in the range of 1-2 MeV.


title: Neutrinos from spin dynamics

abstract:
  We conjecture that neutrino physics might correspond to the spontaneous
magnetisation phase of an Ising-like spin model interaction coupled to neutrino
chirality which operates at scales close to the Planck mass. We argue that this
scenario leads to a simple extension of the Standard Model with no additional
parameters that dynamically generates parity violation and spontaneous symmetry
breaking for the gauge bosons which couple to the neutrino. The neutrino mass
in the model ~ (the electroweak scale)^2 / 2M where M is the scale of the
``spin-spin'' interaction. For the ground state of the model the free energy
density corresponding to the cosmological constant is ~ the neutrino mass,
consistent with observation.


title: Jets from Massive Unstable Particles: Top-Mass Determination

abstract:
  We construct jet observables for energetic top quarks that can be used to
determine a short distance top quark mass from reconstruction in e+ e-
collisions with accuracy better than Lambda_{QCD}. Using a sequence of
effective field theories we connect the production energy, mass, and top width
scales, Q>> m>> Gamma, for the top jet cross section, and derive a QCD
factorization theorem for the top invariant mass spectrum. Our analysis
accounts for: alpha_s corrections from the production and mass scales,
corrections due to constraints in defining invariant masses, non-perturbative
corrections from the cross-talk between the jets, and alpha_s corrections to
the Breit-Wigner line-shape. This paper mainly focuses on deriving the
factorization theorem for hemisphere invariant mass distributions and other
event shapes in e+e- collisions applicable at a future Linear Collider. We show
that the invariant mass distribution is not a simple Breit-Wigner involving the
top width. Even at leading order it is shifted and broadened by
non-perturbative soft QCD effects. We predict that the invariant mass peak
position increases linearly with Q/m due to these non-perturbative effects.
They are encoded in terms of a universal soft function that also describes soft
effects for massless dijet events. In a future paper we compute alpha_s
corrections to the jet invariant mass spectrum, including a summation of large
logarithms between the scales Q, m and Gamma.


title: Emerging Theory of Strongly Coupled Quark-Gluon Plasma

abstract:
  RHIC data have shown robust collective flows, including recent spectacular
``conical flow'' from quenched jets: that confirms that QGP above the critical
line is in a strongly coupled regime. One way to study Non-Abelian classical
strongly coupled plasmas is via molecular dynamics, which was recently extended
to plasmas with electric and magntic charges. First results on its transport
(diffusion and viscosity) are reported.
  AdS/CFT correspondence is another actively pursuit approach to strong
coupling regime: we review new results for heavy quark motion and even complete
picture of conical flow, obtained from linearized gravity dual. Recent
developments in (non-linearized) gravity aims at reproduction of the whole
time-dependent picture of the explosion. We finally compare transport
properties obtained from RHIC data to those obtained in MD and AdS/CFT.


title:
Neutrino hierarchy from CP-blind observables with high density
  magnetized detectors

abstract:
  High density magnetized detectors are well suited to exploit the outstanding
purity and intensities of novel neutrino sources like Neutrino Factories and
Beta Beams. They can also provide independent measurements of leptonic mixing
parameters through the observation of atmospheric muon-neutrinos. In this
paper, we discuss the combination of these observables from a multi-kton iron
detector and a high energy Beta Beam; in particular, we demonstrate that even
with moderate detector granularities the neutrino mass hierarchy can be
determined for $\theta_{13}$ values greater than 4$^\circ$.


title: Recent Developments in the PQCD Approach

abstract:
  We review recent developments in the perturbative QCD approach to exclusive
hadronic B meson decays. We discuss the important next-to-leading-order
corrections to B -> pi K, pi pi, and the penguin-dominated B -> PV modes, where
P (V) is a pseudo-scalar (vector) meson.


title:
Flavor changing effects on single charged Higgs boson production
  associated with a bottom-charm pair at CERN Large Hadron Collider

abstract:
  We study flavor changing effects on the \ppbchT process at the Large Hadron
Collider(LHC), which are inspired by the left-handed up-type squark mixings in
the Minimal Supersymmetric Standard Model(MSSM). We find that the SUSY QCD
radiative corrections to $bcH^\pm$ coupling can significantly enhance the cross
sections at the tree-level by a factor about $1.5 \sim 5$ with our choice of
parameters. We conclude that the squark mixing mechanism in the MSSM makes the
\ppbchT process a new channel for discovering a charged Higgs boson and
investigating flavor changing effects.


title:
Anomalous Higgs Couplings in the $SO(5)\times U(1)_{B-L}$ Gauge-Higgs
  Unification in Warped Spacetime

abstract:
  The gauge couplings $WWZ$, $WWWW$, and $WWZZ$ in the gauge-Higgs unification
scenario in the Randall-Sundrum warped spacetime remain almost universal as in
the standard model, but substantial deviation results for the Higgs couplings.
In the $SO(5)\times U(1)_{B-L}$ model, the couplings $WWH$ and $ZZH$ are
suppressed by a factor $\cos \theta_H$ from the values in the standard model,
while the bare couplings $WWHH$ and $ZZHH$ are suppressed by a factor
$1-(2/3)\sin^2 \theta_H$. Here $\theta_H$ is the Yang-Mills AB phase (Wilson
line phase) along the fifth dimension, which characterizes the electroweak
symmetry breaking. The suppression can be used to test the gauge-Higgs
unification scenario at LHC and ILC. It is also shown that the $WWZ$ coupling
in flat spacetime deviates from the standard model value at moderate values of
$\theta_H$, contradicting with the LEP2 data.


title: Extensive Air Showers and the Physics of High Energy Interactions

abstract:
  Extensive Air Showers are still the only source of information on primary
cosmic rays and their interactions at energies above PeV. However, this
information is hidden inside the multiplicative character of the cascading
process. Inspite of the great experimental and theoretical efforts the results
of different studies are often ambiguous and even conflicting. These
controversies can partly be referred to imperfections of our models of high
energy interactions. The first part of the paper is concerned with this
problem. The author thinks that the present models should be corrected to give
slightly deeper penetration of the cascade into the atmosphere. In this respect
the modification suggested by the QGSJET-II model seems to be the step in the
right direction. The Sibyll 2.1 model provides a similar penetrating
properties. However, this modification is not enough and a small additional
transfer of the energy from EAS hadrons to the electromagnetic component is
needed too. As a possible candidate for such a process the inelastic charge
exchange of pions is discussed. In the second part of the paper the author
discusses the need to account for the interaction of EAS with the stuff of
detectors, their environment and the ground in the light of the 'neutron
thunder' phenomenon, discovered recently.


title: Probing New Physics Through Bs Mixing

abstract:
  I discuss the interpretation of the recent experimental data on $B_s$ mixing
in terms of model-independent new-physics parameters.


title: Spontaneous CP Violation in SUSY SO(10)

abstract:
  A scenario is suggested for spontaneous CP violation in non-SUSY and SUSY-
SO(10). The idea is to have a scalar potential which generates spontaneously a
phase, at the high scale, in the VEV that gives a mass to the RH neutrinos. As
a possible realization the case of the minimal renormalizable SUSY SO(10) is
discussed in detail and one finds that a phase is induced in the CKM matrix. It
is also pointed out that, in these models, the scales of Baryogenesis, Seesaw,
Spontaneous CP violation and Spontaneous U(1)PQ breaking are all at the same
order of magnitude.


title:
Baryon-baryon and baryon-antibaryon interaction amplitudes in the
  spin--momentum operator expansion method

abstract:
  Partial wave scattering amplitudes in baryon-baryon and baryon-antibaryon
collisions and amplitudes for the production and decay of baryon resonances are
constructed in the framework of the spin-momentum operator expansion method.
The approach is relativistically invariant and it allows us to perform combined
analyses of different reactions imposing analyticity and unitarity directly.
The role of final state interactions (triangle and box diagrams) is discussed.


title: Determining the WIMP mass using direct detection experiments

abstract:
  We study the accuracy with which the WIMP mass could be determined by a
superCDMS-like direct detection experiment, given optimistic assumptions about
the detector set-up and WIMP properties. We consider WIMPs with an interaction
cross-section of \sigma_{\rm p} = 10^{-7} {\rm pb} (just below current
exclusion limits) and assume, initially, that the local WIMP velocity
distribution and density are known and that the experiment has negligible
background. For light WIMPs (mass significantly less than that of the target
nuclei) small variations in the WIMP mass lead to significant changes in the
energy spectrum. Conversely for heavy WIMPs the energy spectrum depends only
weakly on the WIMP mass. Consequently it will be far easier to measure the WIMP
mass if it is light than if it is heavy. With exposures of {\cal E}= 3 \times
10^{3}, 3 \times 10^{4} and 3 \times 10^{5} {\rm kg day} (corresponding,
roughly, to the three proposed phases of SuperCDMS) it will be possible, given
the optimistic assumptions mentioned above, to measure the mass of a light WIMP
with an accuracy of roughly 25%, 15% and 2.5 % respectively. These numbers
increase with increasing WIMP mass, and for heavy WIMPs, m_{\chi} > {\cal
O}(500 {\rm GeV}), even with a large exposure it will only be possible to place
a lower limit on the mass. Finally we discuss the validity of the various
assumptions made, and the consequences if these assumptions are not valid. In
particular if the local WIMP distribution is composed of a number of discrete
streams it will not be possible to determine the WIMP mass.


title: Inhomogeneous phase of a Gluon Plasma at finite temperature and density

abstract:
  By considering the non-perturbative effects associated with the fundamental
modular region, a new phase of a Gluon Plasma at finite density is proposed. It
corresponds to the transition from glueballs to non-perturbative gluons which
condense at a non vanishing momentum. In this respect the proposed phase is
analogous to the color superconducting LOFF phase for fermionic systems.


title:
Anthropic tuning of the weak scale and of m_u/m_d in two-Higgs-doublet
  models

abstract:
  It is shown that in a model in which up-type and down-type fermions acquire
mass from different Higgs doublets, the anthropic tuning of the Higgs mass
parameters can explain the fact that the observed masses of the $d$ and $u$
quarks are nearly the same with $d$ slightly heavier. If Yukawa couplings are
assumed not to "scan" (vary among domains), this would also help explain why
the t quark is much heavier than the b quark. It is also pointed out that the
existence of dark matter invalidates some earlier anthropic arguments against
the viability of domains where the Standard Model Higgs has positive $\mu^2$,
but makes other even stronger arguments possible.


title:
Phenomenological analysis of two-photon exchange effects in proton form
  factor measurements

abstract:
  We perform a model-independent phenomenological analysis of experimental data
on proton form factors ratio. We find that only one of the two photon exchange
amplitudes, which we call $\delta G_M$, is responsible for the discrepancy
between Rosenbluth and polarization methods. The linearity of Rosenbluth plots
implies that $\delta G_M$ is approximately linear function of $\epsilon$. The
slope of $\delta G_M$ is extracted from experimental data and is shown to be
consistent with theoretical calculations.


title: Phase Transition to Exact Susy

abstract:
  The anthropic principle is based on the observation that, within narrow
bounds, the laws of physics are such as to have allowed the evolution of life.
The string theoretic approach to understanding this observation is based on the
expectation that the effective potential has an enormous number of local minima
with different particle masses and perhaps totally different fundamental
couplings and space time topology. The vast majority of these alternative
universes are totally inhospitable to life, having, for example, vacuum
energies near the natural (Planck) scale. The statistics, however, are assumed
to be such that a few of these local minima (and not more) have a low enough
vacuum energy and suitable other properties to support life. In the
inflationary era, the "multiverse" made successive transitions between the
available minima until arriving at our current state of low vacuum energy.
String theory, however, also suggests that the absolute minimum of the
effective potential is exactly supersymmetric. Questions then arise as to why
the inflationary era did not end by a transition to one of these, when will the
universe make the phase transition to the exactly supersymmetric ground state,
and what will be the properties of this final state.


title: Quark-Gluon Bags with Surface Tension

abstract:
  The temperature and chemical potential dependent surface tension of bags is
introduced into the gas of quark-gluon bags model. This resolves a long
standing problem of a unified description of the first and second order phase
transition with the cross-over. Such an approach is necessary to model the
complicated properties of quark-gluon plasma and hadronic matter from the first
principles of statistical mechanics. The suggested model has an exact
analytical solution and allows one to rigorously study the vicinity of the
critical endpoint of the deconfinement phase transition. The existence of
higher order phase transitions at the critical endpoint is discussed. In
addition, we found that at the curve of a zero surface tension coefficient
there must exist the surface induced phase tranition of the 2$^{nd}$ or higher
order, which separates the pure quark gluon plasma (QGP) from the cross-over
states, that are the mixed states of hadrons and QGP bags. Thus, the present
model predicts that the critical endpoint of quantum chromodynamics is the
tricritical endpoint.


title: Partially composite two Higgs doublet model

abstract:
  We consider a possibility that electroweak symmetry breaking (EWSB) is
triggered by a fundamental Higgs and a composite Higgs arising in a dynamical
symmetry breaking mechanism induced by a new strong dynamics. The resulting
Higgs sector is a partially composite two-Higgs doublet model with specific
boundary conditions on the coupling and mass parameters originating at a
compositeness scale. The phenomenology of this model is discussed including the
collider phenomenology at LHC and ILC.


title: Study of X(1812) as a $(K^*\bar K^*)$ Molecular State

abstract:
  We investigate the decay and the production mechanism of the resonance
X(1812) recently observed in the $\jp\to\gamma X(1812), X(1812)\to\omega\phi$
at BESII. The decay widths of $X(1812)\to\eta\eta'$,$ \eta\eta$,$ \omega\phi$,$
K^+K^-$,$ \rho^+\rho^-$, $ \omega\omega$,$ K^{*+}K^{*-}$ and $\pi^+\pi^-$ are
evaluated based on the scenario of the X(1812) as a candidate of $(\ksks)$
molecule. It turns out that the quark exchange mechanism plays an important
role in the understanding of the large decay width for the
$X(1812)\to\omega\phi$. It is also found that the decay widths for
$X(1812)\to\eta\eta'$ and $\eta\eta$ are enhanced by the quark exchange
mechanism. These channels are suggested to be the tools to test the molecular
scenario in experiment. The branching fraction of $Br(X\to\omega\phi)$ is
evaluated to be about 4.60%. Searches for additional evidence about the X(1812)
in $\jp$ radiative decays are reviewed. In the molecular scenario, the X(1812)
production rate is also evaluated to be $\Gamma(\jp\to\gamma
X)/\Gamma(\jp\to\gamma K^{*+}K^{*-})=2.13^{+7.41}_{-1.85}$, which is close to
the measured value $2.83\pm0.92$.


title: New Hadron States

abstract:
  The past four years has witnessed the renaissance of the hadron spectroscopy.
Many interesting new hadron states were discovered experimentally, some of
which do not fit into the quark model easily. I will give a concise overview of
these states and their possible interpretations. Topics covered in this review
are: (1) candidates of new light hadrons including $p {\bar p}$ threshold
enhancement, X(1835), X(1576), $f_0(1810)$, recent candidates of the $1^{-+}$
exotic mesons, Y(2175), $p\bar\Lambda$ threshold enhancement etc; (2) charmed
mesons including p-wave non-strange charmed mesons, $D_{sj}(2317)$ and
$D_{sj}(2460)$, recent candidates of higher excited charmed mesons,
$D_{sj}(2632)$ etc; (3) charmonium and charmonium-like states such as X(3872),
Y(4260), X(3940), Y(3940), Z(3930) etc. The effect from the nearby S-wave open
channels on the quark model spectrum above or near strong decay threshold is
emphasized. Dynamical lattice simulations of $D K$ and $D^0\bar D^{\ast 0}$
scattering and the extraction of their phase shifts may help resolve the
underlying structure of $D_{sj}(2317)$, $D_{sj}(2460)$ and X(3872).


title: Status of SM calculations of b > s transitions

abstract:
  We report recent progress in SM calculations of $b \to s$ transitions. We
discuss the first NNLL prediction of the $\bar B \to X_s \gamma$ branching
ratio, including important additional subtleties due to non-perturbative
corrections and logarithmically-enhanced cut effects, and also recent results
on the inclusive mode $\bar B \to X_s \ell^+ \ell^-$. Moreover, new results on
the corresponding exclusive modes are reviewed. Finally, we comment on the
present status of the so-called $B \to K \pi$ puzzle in hadronic $b \to s$
transitions


title:
Comments on differential cross section of phi-meson photoproduction at
  threshold

abstract:
  We show that the differential cross section d_sigma/d_t of gamma p --> \phi p
reaction at the threshold is finite and its value is crucial to the mechanism
of the phi meson photoproduction and for the models of phi-N interaction.


title:
Deconfinement transition for nonzero baryon density in the Field
  Correlator Method

abstract:
  Deconfinement phase transition due to disappearance of confining
colorelectric field correlators is described using nonperturbative equation of
state. The resulting transition temperature $T_c(\mu)$ at any chemical
potential $\mu$ is expressed in terms of the change of gluonic condensate
$\Delta G_2$ and absolute value of Polyakov loop $L_{fund} (T_c)$, known from
lattice and analytic data, and is in good agreement with lattice data for
$\Delta G_2 \approx 0.0035 $ GeV$^4$. E.g. $T_c(0) =0.27; 0.19; 0.17$ GeV for
$n_f=0,2,3$ respectively.


title:
BABAR status and prospects for CP asymmetry measurements:
  sin(2beta+gamma)

abstract:
  The recent experimental results on CP violation related to the angles of the
Cabibbo-Kobayashi-Maskawa (CKM) unitarity triangle 2beta+gamma are summarized
in these proceedings. These results are obtained with approximately 232 million
Y4S->BBbar events collected with the BABAR detector at the PEP-II
asymmetric-energy B-factory at SLAC. Using the measurements on time-dependent
CP asymmetries in B0->D(*)-+pi+- and B0->D-+rho+- decays and theoretical
assumptions, one finds |sin(2beta+gamma)|>0.64 (0.40) at 68% (90%) confidence
level. The perspectives of sin(2beta+gamma) measurement with B0bar-> D(*)0bar
K(*)0 and B0->D(*)-+ a_0(2)+- decay channels are also discussed.


title: QCD Viscosity to Entropy Density Ratio in the Hadronic Phase

abstract:
  Shear viscosity (eta) of QCD in the hadronic phase is computed by the coupled
Boltzmann equations of pions and nucleons in low temperatures and low baryon
number densities. The eta to entropy density ratio eta/s maps out the nuclear
gas-liquid phase transition by forming a valley tracing the phase transition
line in the temperature-chemical potential plane. When the phase transition
turns into a crossover, the eta/s valley gradually disappears. We suspect the
general feature for a first-order phase transition is that eta/s has a
discontinuity in the bottom of the eta/s valley. The discontinuity coincides
with the phase transition line and ends at the critical point. Beyond the
critical point, a smooth eta/s valley is seen. However, the valley could
disappear further away from the critical point. The eta/s measurements might
provide an alternative to identify the critical points.


title: Leptons and photons at the LHC: cascades through spinless adjoints

abstract:
  We study the hadron collider phenomenology of (1,0) Kaluza-Klein modes along
two universal extra dimensions compactified on the chiral square. Cascade
decays of spinless adjoints proceed through tree-level 3-body decays involving
leptons as well as one-loop 2-body decays involving photons. As a result,
spectacular events with as many as six charged leptons, or one photon plus four
charged leptons are expected to be observed at the LHC. Unusual events with
relatively large branching fractions include three leptons of same charge plus
one lepton of opposite charge, or one photon plus two leptons of same charge.
We estimate the current limit from the Tevatron on the compactification scale,
set by searches for trilepton events, to be around 270 GeV.


title: Long distance contributions to the eta_b => Jpsi Jpsi decay

abstract:
  It was argued long ago that eta_b could be observed through the eta_b =>
Jpsi(=> mu+ mu-) Jpsi(=> mu+ mu-) decay chain. Recent calculations indicate
that the width of eta_b into two Jpsi is almost 3 orders of magnitude smaller
than the one into the D bar D*. We study the effects of final-state
interactions due to the D bar D* intermediate state on the Jpsi Jpsi final
state. We find that the inclusion of this contribution may enhance the
short-distance branching ratio up to about 2 orders of magnitude.


title:
Transport rates and momentum isotropization of gluon matter in
  ultrarelativistic heavy-ion collisions

abstract:
  To describe momentum isotropization of gluon matter produced in
ultrarelativistic heavy-ion collisions, the transport rate of gluon drift and
the transport collision rates of elastic ($gg \leftrightarrow gg$) as well as
inelastic ($gg \leftrightarrow ggg$) perturbative quantum chromodynamics-
(pQCD) scattering processes are introduced and calculated within the kinetic
parton cascade Boltzmann approach of multiparton scatterings (BAMPS), which
simulates the space-time evolution of partons. We define isotropization as the
development of an anisotropic system as it reaches isotropy. The inverse of the
introduced total transport rate gives the correct time scale of the momentum
isotropization. The contributions of the various scattering processes to the
momentum isotropization can be separated into the transport collision rates. In
contrast to the transport cross section, the transport collision rate has an
indirect but correctly implemented relationship with the collision-angle
distribution. Based on the calculated transport collision rates from BAMPS for
central Au+Au collisions at Relativistic Heavy Ion Collider energies, we show
that pQCD $gg \leftrightarrow ggg$ bremsstrahlung processes isotropize the
momentum five times more efficiently than elastic scatterings. The large
efficiency of the bremsstrahlung stems mainly from its large momentum
deflection. Due to kinematics, $2\to N$ $(N>2)$ production processes allow more
particles to become isotropic in momentum space and thus kinetically
equilibrate more quickly than their back reactions or elastic scatterings. We
also show that the relaxation time in the relaxation time approximation, which
is often used, is strongly momentum dependent and thus cannot serve as a global
quantity that describes kinetic equilibration.


title: Quark and lepton mass matrices with $A_4$ family symmetry

abstract:
  Realistic quark masses and mixing angles are obtained applying the successful
$A_4$ family symmetry for leptons, motivated by the quark-lepton assignments of
SU(5). The $A_4$ symmetry is suitable to give tri-bimaximal neutrino mixing
matrix which is consistent with current experimental data. We study new
scenario for the quark sector with the $A_4$ symmetry.


title: Lessons from BaBar and Belle measurements of D-Dbar mixing parameters

abstract:
  The BaBar and Belle experiments have recently presented evidence for D-Dbar
mixing. We explain the following points: (i) The measurements imply width
difference $y \sim 0.01$. In the limit of small CP violation, the CP-odd state
is longer-lived; (ii) $y\sim0.01$ is consistent with the Standard Model. It
suggests that SU(3) breaking from phase space effects is likely to play a major
role; (iii) There is no evidence for either large mass splitting or CP
violation. Consequently, there is no hint for new physics; (iv) The stronger
bounds on the mass splitting and on CP violation imply that, if squarks are
observed at the LHC, it is unlikely that they will be non-degenerate.


title:
Possible experimental signatures at the LHC of strongly interacting
  electro-weak symmetry breaking

abstract:
  If electro-weak symmetry is broken by a new strongly interacting sector, new
physics will probably manifest itself in gauge boson scattering at the LHC. The
relevant dynamics is well described in terms of an effective lagrangian. We
discuss the probable size of the coefficients of the relevant operators under a
combination of model-independent constraints and reasonable assumptions based
on two models of the strongly interacting sector. We compare these values with
LHC sensitivity and argue that they will be too small to be seen. Therefore,
the presence of vector and scalar resonances required by unitarity will be the
only characteristic signature. We analyze the most likely masses and widths of
these resonances.


title: Infrared non-perturbative QCD running coupling from Bogolubov approach

abstract:
  We apply Bogolubov approach to QCD to demonstrate a spontaneous generation of
three-gluon gauge invariant effective interaction which contributes
significantly at the infrared region. The contribution of this interaction to
$\alpha_s(p^2)$ leads to description of its behaviour in correspondence to
phenomenology and lattice calculations without introduction of any additional
parameter.


title:
Dropping rho and A1 Meson Masses at the Chiral Phase Transition in the
  Generalized Hidden Local Symmetry

abstract:
  In this contribution to the proceedings, we present our recent analysis on
the chiral symmetry restoration in the generalized hidden local symmetry (GHLS)
which incorporates the rho meson, $A_1$ meson and the pion consistently with
the chiral symmetry of QCD. It is shown that a set of parameter relations,
which ensures the first and second Weinberg sum rules, is invariant under the
renormalization group evolution. Then, it is found that the Weinberg sum rules
together with the matching of the vector and axial-vector current correlators
to the OPE inevitably leads to {\it the dropping masses of both rho and $A_1$
mesons} at the symmetry restoration point, and that the mass ratio flows into
one of three fixed points.


title:
Comparative analysis of non-perturbative effects in B -> X_u l anti-nu_l
  decays

abstract:
  In order to extract the Cabibbo-Kobayashi-Maskawa matrix element |V_{ub}|
from B -> X_u l anti-nu_l decays, the overwhelming background from B -> X_c l
anti-nu_l decays must be reduced by appropriate acceptance cuts. We study the
non-perturbative effects due to the motion of the b quark inside the B meson on
the phenomenologically relevant decay distributions of B -> X_u l anti-nu_l in
the presence of such cuts in a comparative analysis based on shape functions
and the parton model in the light-cone limit. Comparisons with recent data from
the CLEO, BABAR, and BELLE collaborations favor the shape-function approach.


title: Propagation of Uncertainty in a Parton Shower

abstract:
  Presented here is a technique of propagating uncertainties through the parton
shower by means of an alternate event weight. This technique provides a
mechanism to systematically quantify the effect of variations of certain
components of the parton shower leading to a novel approach to probing the
physics implemented in a parton shower code and understanding its limitations.
Further, this approach can be applied to a large class of parton shower
algorithms and requires no changes to the underlying implementation.


title: Lattice calculations for B and K mixing

abstract:
  The bag parameters and the decay constants of neutral B and K mesons were
among the non-perturbative hadronic inputs to the classical CKM Unitarity
Triangle Analysis. Thanks to the big amount of experimental information
collected in the last few years at the B-factories and by the CDF
collaboration, these matrix elements are now among the outputs of the unitarity
fits, once the validity of the Standard Model has been postulated. Lattice
calculations of the mixing amplitudes are still needed in order to make a test
of the theory, provided that their statistical and systematic errors are under
control at the level of a few percent. Here we review some of the recent
lattice calculations of these quantities.


title:
Global analysis of fragmentation functions for pions and kaons and their
  uncertainties

abstract:
  We present new sets of pion and kaon fragmentation functions obtained in NLO
combined analyses of single-inclusive hadron production in electron-positron
annihilation, proton-proton collisions, and deep-inelastic lepton-proton
scattering with either pions or kaons identified in the final state. At
variance with all previous fits, the present analyses take into account data
where hadrons of different electrical charge are identified, which allow to
discriminate quark from anti-quark fragmentation functions without the need of
non trivial flavor symmetry assumptions. The resulting sets are in good
agreement with all data analyzed, which cover a much wider kinematical range
than in previous fits. An extensive use of the Lagrange multiplier technique is
made in order to assess the uncertainties in the extraction of the
fragmentation functions and the synergy from the complementary data sets in our
global analysis.


title:
Compatibility of the chameleon-field model with fifth-force experiments,
  cosmology, and PVLAS and CAST results

abstract:
  We analyse the PVLAS results using a chameleon field whose properties depend
on the environment. We find that, assuming a runaway bare potential $V(\phi)$
and a universal coupling to matter, the chameleon potential is such that the
scalar field can act as dark energy. Moreover the chameleon field model is
compatible with the CAST results, fifth force experiments and cosmology.


title:
Analyzing B_s - bar B_s mixing: Non-perturbative contributions to bag
  parameters from sum rules

abstract:
  We use QCD sum rules to compute matrix elements of the Delta B=2 operators
appearing in the heavy-quark expansion of the width difference of the B_s mass
eigenstates. Our analysis includes the leading-order operators Q and Q_S, as
well as the subleading operators R_2 and R_3, which appear at next-to-leading
order in the 1/m_b expansion. We conclude that the violation of the
factorization approximation for these matrix elements due to non-perturbative
vacuum condensates is as low as 1-2%.


title: Basics of D0-\bar D0 Mixing

abstract:
  Complementing the presentations, at this conference, of the first
experimental evidence for $D$ mixing found at BaBar and Belle, I discuss the
theoretical status of $D$ mixing.


title: Dark energy, the colored anti-de Sitter vacuum, and LHC phenomenology

abstract:
  We study the possibility that the current accelerated expansion of the
universe is driven by the vacuum energy density of a colored scalar field which
is responsible for a phase transition in which the gauge SU(3)_c symmetry
breaks. We show that if we are stuck in a SU(3)_c - preserving false vacuum,
then SU(3)_c symmetry breaking can be accommodated without violating any
experimental QCD bounds or bounds from cosmological observations. Moreover,
unless there is an unnatural fine-tuning beyond the usual cosmological constant
fine-tuning, the true vacuum state of the universe is anti-de Sitter. The model
can likely be tested at the LHC. A possible (though not necessary) consequence
of the model is the existence of fractionally charged massive hadrons. The
model can be embedded in supersymmetric theories where massive colored scalar
fields appear naturally.


title: Higgs Cascade Decays to $\gamma\gamma + \jet \jet$ at the LHC

abstract:
  Extra light electroweak singlets can dramatically alter Higgs decays by
introducing additional decay modes, $h\to aa$. In scenarios where cascade
decays $h\to aa\to 4X, X\ne b,\bar b$ dominate, the Higgs will escape
conventional searches and may be as light as $82 \gev$. In this paper we
investigate the discovery potential of the mode $h\to aa\to 2\gamma 2g$ through
direct ($pp\to h$) and associated ($pp \to W^{\pm}h$) Higgs production at the
LHC. Our search covers all kinematically allowed singlet masses for $\sim 80
\gev \le m_h < 160 \gev$ and assumes an integrated luminosity $\CL = 300 {\rm
fb}^{-1}$. We find associated production, despite a smaller production cross
section, to be the better mode. A branching ratio $BR(h\to 2\gamma 2g) \cong
0.04$ is sufficient for discovery in the bulk of our search window. Given the
same luminosity and branching ratio 0.04, direct detection fails to discover a
Higgs anywhere in our search window. Discovery in the limited region $m_h > 120
\gev, m_a \sim 25 \gev$ is possible with direct production when the branching
ratio is $\simge 0.06$.


title:
Elastic $pp$ and $\bar pp$ scattering in the models of unitarized
  pomeron

abstract:
  Elastic scattering amplitudes dominated by the Pomeron singularity which obey
the principal unitarity bounds at high energies are constructed and analyzed.
Confronting the models of double and triple (at $t=0$) Pomeron pole
(supplemented by some terms responsible for the low energy behaviour) with
existing experimental data on $pp$ and $\bar pp$ total and differential cross
sections at $\sqrt{s}\geq 5$ GeV and $|t|\leq 6$ GeV$^{2}$ we are able to tune
the form of the Pomeron singularity. Actually the good agreement with those
data is received for both models though the behaviour given by the dipole model
is more preferable in some aspects. The predictions made for the LHC energy
values display, however, the quite noticeable difference between the
predictions of models at $t\approx -0.4$ GeV$^{2}$. Apparently the future
results of TOTEM will be more conclusive to make a true choice.


title:
Testing CPT Invariance in B^0_d-\bar{B}^0_d and B^0_s-\bar{B}^0_s
  Oscillations

abstract:
  Recent CDF and D0 measurements of B^0_s-\bar{B}^0_s mixing make it possible
to search for CP violation and test CPT symmetry in a variety of B_s decays.
Considering both coherent B^0_d\bar{B}^0_d decays at the \Upsilon (4S)
resonance and coherent B^0_s\bar{B}^0_s decays at the \Upsilon (5S) resonance,
we formulate their time-dependent and time-integrated rates by postulating
small CPT violation in B^0_d-\bar{B}^0_d and B^0_s-\bar{B}^0_s oscillations. We
show that the opposite-sign dilepton events from either C-odd or C-even
B^0_q\bar{B}^0_q states (for q = d or s) can be used to determine or constrain
the CPT-violating parameter at a super-B factory. The possibility of
distinguishing between the effect of CPT violation and that of \Delta B =
-\Delta Q transitions is also discussed.


title:
New Approach to Texture-zeros with S_3 symmetry - Flavor Symmetry and
  Vacuum Aligned Mass Textures -

abstract:
  A texture-zeros is an approach to reduce the number of free parameters in
Yukawa couplings and it is one of the most attractive ones. In our paper, we
discuss the origin of zero-structure in texture-zeros by S_3 flavor symmetry
approach. Some of electroweak doublet Higgs fields have vanishing vacuum
expectation value(VEV) which leads to vanishing elements in quark and lepton
mass matrices. Then, the structure of supersymmetric scalar potential is
analyzed and Higgs fields have non-trivial S_3 charges. As a prediction of our
paper, a lower bound of a MNS matrix element, U_{e3} \geq 0.04, is obtained.
The suppression of flavor-changing neutral currents(FCNC) mediated by the Higgs
fields is discussed and lower bounds of the Higgs masses are derived.


title: Tests of the Standard Model with Low-Energy Neutrino Beams

abstract:
  We discuss the possibility of using future high--intensity low--energy
neutrino beams for precision tests of the Standard Model. In particular we
consider the determination of the electroweak mixing angle from elastic and
quasi--elastic neutrino--nucleon scattering at a superbeam or $\beta$--beam.


title:
Importance of the Mechanism of Resonance Enhancement of Neutrino
  Oscillations in Matter for the Precise Testing of the Electroweak Interaction
  Model. Present Experimental Status of This Resonance Mechanism

abstract:
  The mechanism of resonance enhancement of neutrino oscillations in matter and
some critical remarks to this mechanism are considered. Using of this resonance
mechanism is very important to examine the model of electroweak interactions
since the processes induced by this mechanism grow multiply. In contrast to the
electromagnetic and strong interactions in weak interactions, $P$-parity is
violated therefore a problem of mass generations in the weak interactions is
considered (the interaction must be left-right symmetric for mass generations).
It is concluded that a possibility of mass generation in the framework of the
weak interactions is not proved. The present experimental status of this
resonance mechanism is considered and it is done conclusion that this effect
has no clear experimental confirmation. For this purpose it is necessary to
fulfil precision experiments with solar neutrinos and the neutrinos passed
through the Earth matter.


title: Probing flavor structure in unified theory with scalar spectroscopy

abstract:
  The flavor structure in unified theory is probed with superparticle mass
spectrum observed in future particle experiments. A key ingredient is the
generation dependence of scalar mass non-degeneracy. The observed
non-degeneracy in low-energy regime is shown to provide a direct imprint of
flavor structure in high-energy fundamental theory. The implication from
flavor-violating rare process is also discussed.


title:
Littlest Higgs Model with T-Parity Confronting the New Data on D^0-\bar
  D^0 Mixing

abstract:
  Motivated by the first experimental evidence of meson oscillations in the D
system, we study D^0 - \bar D^0 mixing in the Littlest Higgs model with
T-parity, we investigate its role in constraining the model parameters and its
impact on the most interesting flavour observables. We find that the
experimental data are potentially strongly constraining but at present limited
by large theoretical uncertainties in the long-distance Standard Model
contribution to D^0 - \bar D^0 mixing.


title: Quark Condensates: Flavour Dependence

abstract:
  We determine the q-bar q condensate for quark masses from zero up to that of
the strange quark within a phenomenologically successful modelling of continuum
QCD by solving the quark Schwinger-Dyson equation. The existence of multiple
solutions to this equation is the key to an accurate and reliable extraction of
this condensate using the operator product expansion. We explain why
alternative definitions fail to give the physical condensate.


title:
Can experiment distinguish tetraquark scalars, molecules and $\qq$
  mesons?

abstract:
  Scalar mesons are a key expression of the strong coupling regime of QCD. How
those with $I_3=0$ couple to two photons supplies important information about
which is transiently ${\bar q}q$ or ${\bar {qq}} qq$ or multi-meson molecule or
largely glue, provided (i) we know the location of the corresponding poles in
the complex energy plane, and (ii) we have reliable predictions from strong
coupling QCD of the radiative widths for these compositions. Number (i) is
being supplied by careful analyses of high statistics data particularly that
coming from $B$, $D$, $J/\psi$ and $\phi$ decays. Number (ii) is still
required, before we can answer the question in the title.


title: Faddeev study of heavy baryon spectroscopy

abstract:
  We investigate the structure of heavy baryons containing a charm or a bottom
quark. We employ a constituent quark model successful in the description of the
baryon-baryon interaction which is consistent with the light baryon spectra. We
solve exactly the three-quark problem by means of the Faddeev method in
momentum space. Heavy baryon spectrum shows a manifest compromise between
perturbative and nonperturbative contributions. The flavor dependence of the
one-gluon exchange is analyzed. We assign quantum numbers to some already
observed resonances and we predict the first radial and orbital excitations of
all states with $J=1/2$ or 3/2. We combine our results with heavy quark
symmetry and lowest-order SU(3) symmetry breaking to predict the masses and
quantum numbers of six still non-measured ground-state beauty baryons.


title:
Investigating The Physics Case of Running a B-Factory at the Y(5S)
  Resonance

abstract:
  We discuss the physics case of a high luminosity B-Factory running at the
Y(5S) resonance. We show that the coherence of the B meson pairs is preserved
at this resonance, and that Bs can be well distinguished from Bd and charged B
mesons. These facts allow to cover the physics program of a traditional
B-Factory and, at the same time, to perform complementary measurements which
are not accessible at the Y(4S). In particular we show how, despite the
experimental limitations in performing time-dependent measurements of Bs
decays, the same experimental information can be extracted, in several cases,
from the determination of time-integrated observables. In addition, a few
examples of the potentiality in measuring rare Bs decays are given. Finally, we
discuss how the study of Bs meson will improve the constraints on New Physics
parameters in the Bs sector, in the context of the generalized Unitarity
Triangle analysis.


title: Theoretical issues in J/psi suppression

abstract:
  Two decades ago Matsui and Satz suggested that Debye screening in the
quark-gluon plasma would result in J/psi suppression in heavy ion collisions.
Much has happened in the subsequent years, and the picture of quark-gluon
plasma at present is rapidly evolving - what does it imply for the J/psi
suppression? What are the recent RHIC and SPS results trying to tell us? What
else has to be done? This talk is an attempt to address these questions.


title: Unparticle Physics

abstract:
  I discuss some simple aspects of the low-energy physics of a nontrivial scale
invariant sector of an effective field theory -- physics that cannot be
described in terms of particles. I argue that it is important to take seriously
the possibility that the unparticle stuff described by such a theory might
actually exist in our world. I suggest a scenario in which some details of the
production of unparticle stuff can be calculated. I find that in the
appropriate low energy limit, unparticle stuff with scale dimension
$d_{\mathcal{U}}$ looks like a non-integral number $d_{\mathcal{U}}$ of
invisible particles. Thus dramatic evidence for a nontrivial scale invariant
sector could show up experimentally in missing energy distributions.


title: Heavy neutrino signals at large hadron colliders

abstract:
  We study the LHC discovery potential for heavy Majorana neutrino singlets in
the process pp -> W+ -> l+ N -> l+ l+ jj (l=e,mu) plus its charge conjugate.
With a fast detector simulation we show that backgrounds involving two
like-sign charged leptons are not negligible and, moreover, they cannot be
eliminated with simple sequential kinematical cuts. Using a likelihood analysis
it is shown that, for heavy neutrinos coupling only to the muon, LHC has 5
sigma sensitivity for masses up to 200 GeV in the final state mu+- mu+- jj.
This reduction in sensitivity, compared to previous parton-level estimates, is
driven by the ~ 10^2-10^3 times larger background. Limits are also provided for
e+- e+- jj and e+- mu+- jj final states, as well as for Tevatron. For heavy
Dirac neutrinos the prospects are worse because backgrounds involving two
opposite charge leptons are much larger. For this case, we study the
observability of the lepton flavour violating signal e+- mu-+ jj. As a
by-product of our analysis, heavy neutrino production has been implemented
within the ALPGEN framework.


title: Probing RS scenarios of flavour at LHC via leptonic channels

abstract:
  We study a purely leptonic signature of the Randall-Sundrum scenario with
Standard Model fields in the bulk at LHC: the contribution from the exchange of
Kaluza-Klein (KK) excitations of gauge bosons to the clear Drell-Yan reaction.
We show that this contribution is detectable (even with the low luminosities of
the LHC initial regime) for KK masses around the TeV scale and for sufficiently
large lepton couplings to KK gauge bosons. Such large couplings can be
compatible with ElectroWeak precision data on the Zff coupling in the framework
of the custodial O(3) symmetry recently proposed, for specific configurations
of lepton localizations (along the extra dimension). These configurations can
simultaneously reproduce the correct lepton masses, while generating acceptably
small Flavour Changing Neutral Current (FCNC) effects. This LHC
phenomenological analysis is realistic in the sense that it is based on fermion
localizations which reproduce all the quark/lepton masses plus mixing angles
and respect FCNC constraints in both the hadron and lepton sectors.


title: Lorentz violation and neutrino oscillations

abstract:
  Lorentz violation naturally leads to neutrino oscillations and provides an
alternative mechanism that may explain current data. In this work, we discuss
possible signals of Lorentz violation in neutrino-oscillation experiments.


title:
Hidden Local Symmetry and the Vector Manifestation of Chiral Symmetry in
  Hot and/or Dense Matter

abstract:
  The emergence and importance of hidden local symmetry in the structure of
hadrons under extreme conditions is discussed. The topics covered are the
potentially important role played by an infinite tower of vector mesons encoded
in holographic dual QCD (or AdS/QCD) in chiral dynamics of mesons and baryons,
in the vector dominance and its violation in EW response functions and the
presence of the vector manifestation fixed point and its influence on the
properties of hadrons in hot temperature (i.e., in relativistic heavy ion
collisions) and in dense matter (i.e., in compact stars). Also discussed are
the natural emergence of instantons/skyrmions from the infinite tower of vector
mesons coupled to pions in AdS/QCD and their (speculated) role in chiral
restoration at high density.


title: Evolution equations for extended dihadron fragmentation functions

abstract:
  We consider dihadron fragmentation functions, describing the fragmentation of
a parton in two unpolarized hadrons, and in particular extended dihadron
fragmentation functions, explicitly dependent on the invariant mass, $M_h$, of
the hadron pair. We first rederive the known results on $M_h$-integrated
functions using Jet Calculus techniques, and then we present the evolution
equations for extended dihadron fragmentation functions. Our results are
relevant for the analysis of experimental measurements of
two-particle-inclusive processes at different energies.


title: Dark Majorana Particles from the Minimal Walking Technicolor

abstract:
  We investigate the possibility of a dark matter candidate emerging from a
minimal walking technicolor theory. In this case techniquarks as well as
technigluons transform under the adjoint representation of SU(2) of
technicolor. It is therefore possible to have technicolor neutral bound states
between a techniquark and a technigluon. We investigate this scenario by
assuming that such a particle can have a Majorana mass and we calculate the
relic density. We identify the parameter space where such an object can account
for the full dark matter density avoiding constraints imposed by the CDMS and
the LEP experiments.


title:
On model-independent measurement of the angle phi_3 using Dalitz plot
  analysis

abstract:
  This report shows the latest results on the study of the method to determine
the angle phi_3 of the unitarity triangle using Dalitz plot analysis of D^0
decay from B->DK process in a model-independent way. We concentrate on the case
with a limited charm data sample, which will be available from the CLEO-c
collaboration in the nearest future, with the main goal to find the optimal
strategy for phi_3 extraction.


title:
Associated charged gauge boson $W_{H}^{-}$ and top quark production in
  the left-right twin higgs model at the LHC

abstract:
  This paper has been withdrawn by the author(s) due to some mistakes in this
paper.


title: Dilepton Signatures of Family Non-Universal U(1)'

abstract:
  The supersymmetric models extending the minimal supersymmetric standard model
(MSSM) by an additional Abelian gauge factor U(1)' in order to solve the mu
problem do generically suffer from anomalies disrupting the gauge coupling
unification found in the MSSM. The anomalies are absent if the minimal matter
content necessitated by the mu problem is augmented with exotic matter species
having appropriate quantum numbers. Recently, it has been shown that anomaly
cancellation can also be accomplished by introducing family non-universal U(1)'
charges and non-holomoprhic soft-breaking terms. We discuss collider signatures
of anomaly-free family non-universal U(1)' model by analyzing dilepton
production in future colliders. We find that, both at LHC and NLC, one can
establish existence/absence of such a Z' boson by simply comparing the number
of dilepton production events for electron, muon and tau lepton. The signal is
free of the SM background.


title: $D-\bar{D}$ mixing constraints on FCNC with a non-universal $Z^\prime$

abstract:
  The BaBar and Belle collaborations have recently reported evidence for
$D^0-\bar D^0$ mixing. This measurement provides the first significant
constraint on FCNC in the up-quark sector for non-universal $Z^\prime$ models.
Attributing the observed $D-\bar D$ mixing to new physics, we comment on the
resulting rare $D$ and $t$ decays. We also show that a CP violating
semileptonic asymmetry as large as $\sim 30%$ is allowed by the experimental
results.


title: Shear viscosity of the quark matter

abstract:
  We discuss shear viscosity of the quark matter by using Kubo formula. The
shear viscosity is calculated in the framework of the quasi-particle RPA for
the Nambu-Jona-Lasinio model. We obtain a formula that the shear viscosity is
expressed by the quadratic form of the quark spectral function in the chiral
symmetric phase. The magnitude of the shear viscosity is discussed assuming the
Breit-Wigner type for the spectral function.


title: Structure of Light Scalar Mesons from D_s and D^0 Non-Leptonic Decays

abstract:
  Non-leptonic D meson decays may provide a reliable testbed for the multiquark
interpretation of light scalar mesons. In this letter we consider D_s decay and
show that a 4-quark f_0(980) meson could induce a decay pattern, which is
forbidden for a q-qbar constituent structure. Experimental tests to probe such
possibilities are within reach in the near future.


title: QCD corrections to tri-boson production

abstract:
  We present a computation of the next-to-leading order QCD corrections to the
production of three Z bosons at the LHC. We calculate these corrections using a
completely numerical method that combines sector decomposition to extract
infrared singularities with contour deformation of the Feynman parameter
integrals to avoid internal loop thresholds. The NLO QCD corrections to pp ->
ZZZ are approximately 50%, and are badly underestimated by the leading order
scale dependence. However, the kinematic dependence of the corrections is
minimal in phase space regions accessible at leading order.


title: An introduction to chiral perturbation theory

abstract:
  A brief introduction to the low-energy effective field theory of the standard
model, chiral perturbation theory, is presented.


title: Preheating and Affleck-Dine leptogenesis after thermal inflation

abstract:
  Previously, we proposed a model of low energy Affleck-Dine leptogenesis in
the context of thermal inflation. The lepton asymmetry is generated at the end
of thermal inflation, which occurs at a relatively low energy scale with the
Hubble parameter somewhere in the range $1 \keV \lesssim H \lesssim 1 \MeV$.
Thus Hubble damping will be ineffective in bringing the Affleck-Dine field into
the lepton conserving region near the origin, leaving the possibility that the
lepton number could be washed out. Previously, we suggested that preheating
could damp the amplitude of the Affleck-Dine field allowing conservation of the
lepton number. In this paper, we demonstrate numerically that preheating does
efficiently damp the amplitude of the Affleck-Dine field and that the lepton
number is conserved as the result. In addition to demonstrating a crucial
aspect of our model, it also opens the more general possibility of low energy
Affleck-Dine baryogenesis.


title: On the ground state of gapless two flavor color superconductors

abstract:
  This paper is devoted to the study of some aspects of the instability of two
flavor color superconductive quark matter. We find that, beside color
condensates, the Goldstone boson related to the breaking of $U(1)_A$ suffers of
a velocity instability. We relate this wrong sign problem, which implies the
existence of a Goldstone current in the ground state or of gluonic
condensation, to the negative squared Meissner mass of the $8^{th}$ gluon in
the g2SC phase. Moreover we investigate the Meissner masses of the gluons and
the squared velocity of the Goldstone in the multiple plane wave LOFF states,
arguing that in such phases both the chromo-magnetic instability and the
velocity instability are most probably removed. We also do not expect Higgs
instability in such multiple plane wave LOFF. The true vacuum of gapless two
flavor superconductors is thus expected to be a multiple plane wave LOFF state.


title: Vacuum phase transition at nonzero baryon density

abstract:
  It is argued that the dominant contribution to the interaction of quark gluon
plasma at moderate $T\geq T_c$ is given by the nonperturbative vacuum field
correlators. Basing on that nonperturbative equation of state of quark-gluon
plasma is computed and in the lowest approximation expressed in terms of
absolute values of Polyakov lines for quarks and gluons $L_{fund} (T);
L_{adj}(T)=(L_{fund})^{9/4}$known from lattice and analytic calculations. Phase
transition at any $\mu$ is described as a transition due to vanishing of one of
correlators, $ D^E(x)$, which implies the change of gluonic condensate $\Delta
G_2$. Resulting transition temperature $T_c(\mu)$ is calculated in terms of
$\Delta$$G_2$ and $L_{fund}(T_c)$. The phase curve $T_c(\mu)$ is in good
agreement with lattice data. In particular $T_c(0)=0.27; 0.19; 0.17$ GeV for
$n_f=0,2,3$ and fixed $\Delta G_2=0.0035$ GeV$^4$.


title: Understanding masses of $c\bar{s}$ states in Regge phenomenology

abstract:
  In the framework of Regge phenomenology, masses of the charmed states
$c\bar{q} (q=u,d,s)$ lying on the $1^3S_1$-like trajectories are estimated. The
overall agreement between our estimated masses and the recent predictions given
by modified quark models[hep-ph/0605019, hep-ph/0608011, hep-ph/0608139] is
good. Masses of the observed charmed states $D_{s0}(2317)$, $D_{sJ}(2860)$ and
$D_{sJ}(2690)$/$D_{sJ}(2700)$ can be reasonably reproduced in the picture of
these charmed states as simple quark-antiquark configurations. We therefore
suggest the $D_{s0}(2317)$ can be identified as the $c\bar{s}(1^3P_0)$ states.
The possible assignments of the $D_{sJ}(2860)$ and $D_{sJ}(2690)$/
$D_{sJ}(2700)$ are discussed.


title:
Determination of the neutrino mass hierarchy in the regime of small
  matter effect

abstract:
  We point out a synergy between T-conjugated oscillation channels in the
determination of the neutrino mass hierarchy with oscillation experiments with
relatively short baselines (L < 700 km), where the matter effect is small. If
information from all four oscillation channels $\nu_\mu\to\nu_e$,
$\bar\nu_\mu\to\bar\nu_e$, $\nu_e\to\nu_\mu$ and $\bar\nu_e\to\bar\nu_\mu$ is
available, a matter effect of few percent suffices to break the sign-degeneracy
and allows to determine the neutrino mass hierarchy. The effect is discussed by
analytical considerations of the relevant oscillation probabilities, and
illustrated with numerical simulations of realistic experimental setups.
Possible configurations where this method could be applied are the combination
of a super beam experiment with a beta beam or a neutrino factory, or a (low
energy) neutrino factory using a detector with muon and electron charge
identification.


title: On Higgs mass generation mechanism in the Standard Model

abstract:
  The mass-generation mechanism is the most urgent problem of the modern
particle physics. The discovery and study of the Higgs boson with the Large
Hadron Collider at CERN are the highest priority steps to solve the problem. In
this paper, the Standard Model Higgs mechanism of the elementary particle mass
generation is reviewed with pedagogical details. The discussion of the Higgs
quadric self-coupling \lambda parameter and the bounds to the Higgs boson mass
are presented. In particular, the unitarity, triviality, and stability
constraints on the Higgs boson mass are discussed. The generation of the finite
value for the \lambda parameter due to quantum corrections via effective
potential is illustrated. Some simple predictions for the top quark and the
Higgs boson masses are given when both the top Yukawa coupling and the Higgs
self-coupling \lambda are equal to 1.


title: Constrained MC for QCD evolution with rapidity ordering and minimum kT

abstract:
  With the imminent start of LHC experiments, development of phenomenological
tools, and in particular the Monte Carlo programs and algorithms, becomes
urgent. A new algorithm for the generation of a parton shower initiated by the
single initial hadron beam is presented. The new algorithm is of the class of
the so called ``constrained MC'' type algorithm (an alternative to the backward
evolution MC algorithm), in which the energy and the type of the parton at the
end of the parton shower are constrained (predefined). The complete kinematics
configurations with explicitly constructed four momenta are generated and
tested. Evolution time is identical with rapidity and minimum transverse
momentum is used as an infrared cut-off. All terms of the leading-logarithmic
approximation in the DGLAP evolution are properly accounted for. In addition,
the essential improvements towards the so-called CCFM/BFKL models are also
properly implemented. The resulting parton distributions are cross-checked up
to the 0.1% precision level with the help of a multitude of comparisons with
other MC and non-MC programs. We regard these tests as an important asset to be
exploited at the time when the presented MC will enter as a building block in a
larger MC program for W/Z production process at LHC.


title:
Evaluating multi-loop Feynman diagrams with infrared and threshold
  singularities numerically

abstract:
  We present a method to evaluate numerically Feynman diagrams directly from
their Feynman parameters representation. We first disentangle overlapping
singularities using sector decomposition. Threshold singularities are treated
with an appropriate contour deformation. We have validated our technique
comparing with recent analytic results for the gg->h two-loop amplitudes with
heavy quarks and scalar quarks.


title:
Electroweak corrections to large transverse momentum production of W
  bosons at the LHC

abstract:
  To match the precision of present and future measurements of W-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 W bosons, with emphasis on large
p_T. We evaluate the full electroweak O(\alpha) corrections to the process pp
-> Wj including virtual and real photonic contributions. We also provide
compact approximate expressions which are valid in the high-energy region,
where the electroweak corrections are strongly enhanced by logarithms of
\hat{s}/M_W^2. These expressions include quadratic and single logarithms at one
loop as well as quartic and triple logarithms at two loops. Numerical results
are presented for proton-proton collisions at 14 TeV. The corrections are
negative and their size increases with p_T. At the LHC, where transverse
momenta of 2 TeV or more can be reached, the one- and two-loop corrections
amount up to -40% and +10%, respectively.


title: |Vub| from Exclusive Semileptonic B to pi Decays

abstract:
  We use Omnes representations of the form factors f_+ and f_0 for exclusive
semileptonic B to pi decays, paying special attention to the treatment of the
B* pole and its effect on f_+. We apply them to combine experimental partial
branching fraction information with theoretical calculations of both form
factors to extract |Vub|. The precision we achieve is competitive with the
inclusive determination and we do not find a significant discrepancy between
our result, |Vub| =(3.90+/-0.32+/-0.18)10^(-3), and the inclusive world average
value, (4.45+/-0.20+/-0.26)10^(-3).


title:
Two-Loop Massive Operator Matrix Elements and Unpolarized Heavy Flavor
  Production at Asymptotic Values Q^2 >> m^2

abstract:
  We calculate the $O(\alpha_s^2)$ massive operator matrix elements for the
twist--2 operators, which contribute to the heavy flavor Wilson coefficients in
unpolarized deeply inelastic scattering in the region $Q^2 \gg m^2$. The
calculation has been performed using light--cone expansion techniques. We
confirm an earlier result obtained in \cite{Buza:1995ie}. The calculation is
carried out without using the integration-by-parts method and in Mellin space
using harmonic sums, which lead to a significant compactification of the
analytic results derived previously. The results allow to determine the heavy
flavor Wilson coefficients for $F_2(x,Q^2)$ to $O(\alpha_s^2)$ and for
$F_L(x,Q^2)$ to $O(\alpha_s^3)$ for all but the power suppressed terms $\propto
(m^2/Q^2)^k, k \geq 1$.


title:
S-wave and P-wave pion-pion and kaon-pion contributions to three-body
  decay processes in the Resonance-Spectrum Expansion

abstract:
  We study S- and P-wave pion-pion and kaon-pion distributions for the
three-body production processes $J/\psi\to\omega\pi^{+}\pi^{-}$, $D^{+}\to
K^{-}\pi^{+}\pi^{+}$, $D^{+}\to K^{+}\pi^{+}\pi^{-}$, and $D^{+}_{s}\to
K^{+}\pi^{+}\pi^{-}$, by applying the Resonance-Spectrum Expansion to the
two-body subamplitudes. The results are compared to the corresponding signals
reported by the BES, E791 and FOCUS collaborations. We find that the studied S-
and P-wave channels can largely account for the observed structures in the data
up to 1 GeV.


title: LCG MCDB -- a Knowledgebase of Monte Carlo Simulated Events

abstract:
  In this paper we report on LCG Monte Carlo Data Base (MCDB) and software
which has been developed to operate MCDB. The main purpose of the LCG MCDB
project is to provide a storage and documentation system for sophisticated
event samples simulated for the LHC collaborations by experts. In many cases,
the modern Monte Carlo simulation of physical processes requires expert
knowledge in Monte Carlo generators or significant amount of CPU time to
produce the events. MCDB is a knowledgebase mainly dedicated to accumulate
simulated events of this type. The main motivation behind LCG MCDB is to make
the sophisticated MC event samples available for various physical groups. All
the data from MCDB is accessible in several convenient ways. LCG MCDB is being
developed within the CERN LCG Application Area Simulation project.


title:
Transversity and Transverse Spin in Nucleon Structure through SIDIS at
  Jefferson Lab

abstract:
  The JLab 12 GeV upgrade with a proposed solenoid detector and the CLAS12
detector can provide the granularity and three-dimensional kinematic coverage
in longitudinal and transverse momentum, $0.1\le x \le 0.5$, $0.3 \le z \le
0.7$ with $P_T \le 1.5 {\rm GeV}$ to precisely measure the leading twist
chiral-odd and $T$-odd quark distribution and fragmentation functions in SIDIS.
The large $x$ experimental reach of these detectors with a 12 GeV CEBAF at JLab
makes it {\em ideal} to obtain precise data on the {\em valence-dominated}
transversity distribution function and to access the tensor charge.


title: Precision gluino mass at the LHC in SUSY models with decoupled scalars

abstract:
  One way to ameliorate the SUSY flavor and CP problems is to postulate that
scalar masses lie in the TeV or beyond regime. For example, the focus point
(FP) region of the minimal supergravity (mSUGRA) model is especially compelling
in that heavy scalar masses can co-exist with low fine-tuning while yielding
the required relic abundance of cold dark matter (via a mixed higgsino-bino
neutralino). We examine many of the characteristics of collider events expected
to arise at the CERN LHC in models with multi-TeV scalars, taking the mSUGRA FP
region as a case study. The collider events are characterized by a hard
component arising from gluino pair production, plus a soft component arising
from direct chargino and neutralino production. Gluino decays in the FP region
are characterized by lengthy cascades yielding very large jet and lepton
multiplicities, and a large b-jet multiplicity. Thus, as one steps to higher
jet, b-jet or lepton multiplicity, signal-over-background rates should steadily
improve. The lengthy cascade decays make mass reconstruction via kinematic
edges difficult; however, since the hard component is nearly pure gluino pair
production, the gluino mass can be extracted to +- 8% via total rate for \eslt
+\ge 7-jet +\ge 2 b-jet events, assuming 100 fb^{-1} of integrated luminosity.
The distribution of invariant mass of opposite-sign/same-flavor dileptons in
the hard component exhibits two dilepton mass edges: m_{\tz_2}-m_{\tz_1} and
m_{\tz_3}-m_{\tz_1}. As a consistency check, the same mass edges should be seen
in isolated opposite-sign dileptons occurring in the soft component trilepton
signal which originates mainly from chargino-neutralino production.


title:
Tests of new physics from precise measurements of the Casimir pressure
  between two gold-coated plates

abstract:
  A micromechanical torsion oscillator has been used to strengthen the limits
on new Yukawa forces by determining the Casimir pressure between two
gold-coated plates. By significantly reducing the random errors and obtaining
the electronic parameters of the gold coatings, we were able to conclusively
exclude the predictions of large thermal effects below 1 $\mu$m and strengthen
the constraints on Yukawa corrections to Newtonian gravity in the interaction
range from 29.5 nm to 86 nm.


title:
Classification of Dimension 5 Lorentz Violating Interactions in the
  Standard Model

abstract:
  We give a complete classification of mass dimension five
Lorentz-non-invariant interactions composed from the Standard Model fields,
using the effective field theory approach. We identify different classes of
Lorentz violating operators, some of which are protected against transmutation
to lower dimensions even at the loop level. Within each class of operators we
determine a typical experimental sensitivity to the size of Lorentz violation.


title: Measuring gamma with B0 -> D0K*0 decays at Babar

abstract:
  We present a feasibility study for a new analysis for extracting the angle
gamma of the Unitarity Triangle from the study of the neutral B meson decays.
We reconstruct the decay channel B0 ->D0 K*0 with the K*0->K+pi- and the D0 ->
KSpipi using a Dalitz analysis technique. The sensitivity to the angle gamma
comes from the interference of the Vcb and Vub processes contributing to the
same final state and by the fact that the B0 (B0bar) can be unambiguosly
identified through the sign of electric charge of the kaon from the K*0 decay.
The impact of such analysis is evaluated for the actual BaBar statistics.


title: Colour Modification of Effective T-odd Distributions

abstract:
  We show that soft-gluon twist-3 contributions to single-spin asymmetries
(SSA) in hard processes may be expressed in the form of effective T-odd Sivers
distributions, whose signs and scales are modified by process-dependent colour
factors. We thus prove that the Sivers mechanism may also be applied at large
transverse momenta. We stress that twist-3 SSA in semi-inclusive deeply
inelastic scattering and Drell-Yan processes are suppressed by transverse
momentum rather than a virtual-photon momentum transfer and thus naively
correspond to twist two at the hadronic level. More rigorously, the
transverse-momentum weighted averages of the Sivers function correspond to
increasing twist (3, 5, 7, ...) while the full kT-dependent Sivers function
(just as other transverse-momentum dependent distribution and fragmentation
functions) corresponds to a resummed infinite tower of higher twists.


title: Dynamics with Vector Condensates at Finite Density in QCD and Beyond

abstract:
  I describe the dynamics in recently revealed phases with vector condensates
of gauge fields in dense QCD (gluonic phase) and other gauge models. In this
case, the Higgs mechanism is provided by condensates of gauge (or gauge plus
scalar) fields. Because most of the initial symmetries in such systems are
spontaneously broken, their dynamics is very rich. In particular, by using the
Ginzburg-Landau approach, the existence of a gluonic phase with both the
rotational symmetry and the electromagnetic U(1) being spontaneously broken was
established. In other words, this phase describes an anisotropic
superconductor. In the dual (confinement) description of this dynamics in dense
two-flavor QCD, there are light exotic vector hadrons in the spectrum, some of
which condense. There are also vortex-like and roton-like excitations in these
phases.


title: Light scalar mesons as tetraquarks within QCD Sum Rules

abstract:
  We examine the interpretation of the light scalar meson nonet as tetraquark
states using QCD sum rules. With the interpolating current for the tetraquark
states composed of scalar diquark and scalar antidiquark, first, we construct
the QCD sum rules by means of the operator product expansion up to the
operators of dimension 8 and show that there is no evidence of the coupling of
the tetraquark states to the light scalar meson nonet. In order to have a
stable sum rule, we propose a "good" interpolating current for the tetraquarks
based on chirality arguments which includes scalar and pseudoscalar
diquark--antidiquarks with equal weights. In particular, for the lowest
tetraquark $\sigma$--meson, we perform detail analysis of the QCD sum rule and
obtain mass for the $\sigma(600)$ around 780 MeV.


title: The Virtual Photon Structure to the Next-to-next-to-leading Order in QCD

abstract:
  We investigate the unpolarized virtual photon structure functions
$F_2^gamma(x,Q^2,P^2)$ and $F_L^gamma(x,Q^2,P^2)$ in perturbative QCD for the
kinematical region $Lambda^2 ll P^2 ll Q^2$, where $-Q^2(-P^2)$ is the mass
squared of the probe (target) photon and $Lambda$ is the QCD scale parameter.
Using the framework of the operator product expansion supplemented by the
renormalization group method, we derive the definite predictions for the
moments of $F_2^gamma(x,Q^2,P^2)$ up to the next-to-next-to-leading order
(NNLO) (the order $alphaalpha_s$) and for the moments of $F_L^gamma(x,Q^2,P^2)$
up to the next-to-leading order (NLO) (the order $alphaalpha_s$). The NNLO
corrections to the sum rule of $F_2^gamma(x,Q^2,P^2)$ are negative and found to
be $7% sim10%$ of the sum of the LO and NLO contributions, when $P^2=1 {rm
GeV}^2$ and $Q^2=30sim 100 {rm GeV}^2$ or $P^2=3 {rm GeV}^2$ and $Q^2=100 {rm
GeV}^2$, and the number of active quark flavors $n_f$ is three or four. The NLO
corrections to $F_L^gamma$ are also negative. The moments are inverted
numerically to obtain the predictions for $F_2^gamma(x,Q^2,P^2)$ and
$F_L^gamma(x,Q^2,P^2)$ as functions of $x$.


title: Introduction to Chiral Perturbation Theory

abstract:
  A brief introduction to chiral perturbation theory, the effective field
theory of quantum chromodynamics at low energies, is given.


title: Meson Screening Masses in the Interacting QCD Plasma

abstract:
  The meson screening mass in the pseudoscalar channel is calculated from the
momentum dependent meson spectral function, using HTL fermionic propagators. A
careful subtraction procedure is required to get an UV finite result. It is
shown that in the whole range of temperatures explored here the HTL screening
mass stays above the non-interacting result, slowly approaching the value
$m_{\trm{scr}}=2\sqrt{\pi^2T^2+m_\infty^2}$, where $m_\infty^2$ is the HTL
asymptotic thermal quark mass. Our analysis leads to a better understanding of
the excitations of QGP at sufficiently large temperatures and may be of
relevance for interpreting lattice results.


title:
Chiral-logarithmic Corrections to the S and T Parameters in Higgsless
  Models

abstract:
  Recently, Higgsless models have proven to be viable alternatives to the
Standard Model (SM) and supersymmetric models in describing the breaking of the
electroweak symmetry. Whether extra-dimensional in nature or their
deconstructed counterparts, the physical spectrum of these models typically
consists of ``towers'' of massive vector gauge bosons which carry the same
quantum numbers as the SM W and Z. In this paper, we calculate the one-loop,
chiral-logarithmic corrections to the S and T parameters from the lightest
(i.e. SM) and the next-to-lightest gauge bosons using a novel application of
the Pinch Technique. We perform our calculation using generic Feynman rules
with generic couplings such that our results can be applied to various models.
To demonstrate how to use our results, we calculate the leading
chiral-logarithmic corrections to the S and T parameters in the deconstructed
three site Higgsless model. As we point out, however, our results are not
exclusive to Higgsless models and may, in fact, be used to calculate the
one-loop corrections from additional gauge bosons in models with fundamental
(or composite) Higgs bosons.


title:
Phenomenology of the $SU(3)_c\otimes SU(3)_L\otimes U(1)_X$ model with
  exotic charged leptons

abstract:
  A phenomenological analysis of the three-family model based on the local
gauge group $SU(3)_c\otimes SU(3)_L\otimes U(1)_X$ with exotic charged leptons,
is carried out. Instead of using the minimal scalar sector able to break the
symmetry in a proper way, we introduce an alternative set of four Higgs scalar
triplets, which combined with an anomaly-free discrete symmetry, produce quark
and charged lepton mass spectrum without hierarchies in the Yukawa coupling
constants. We also embed the structure into a simple group and show some
conditions to achieve a low gauge coupling unification, avoiding possible
conflict with proton decay bounds. By using experimental results from the
CERN-LEP, SLAC linear collider, and atomic parity violation data, we update
constraints on several parameters of the model.


title:
Predictions for "mu -> e gamma" in SUSY from non trivial Quark-Lepton
  complementarity

abstract:
  We compute the effect of non diagonal neutrino mass in l_i -> l_j gamma in
SUSY theories with non trivial Quark-Lepton complementarity and a flavor
symmetry. The correlation matrix V_M=U_{CKM}U_{PMNS} is such that its (1,3)
entry, as preferred by the present experimental data, is zero. We do not assume
that $V_M$ is bimaximal.
  Quark-Lepton complementarity and the flavor symmetry strongly constrain the
theory and we obtain a clear prediction for the contribution to mu -> e gamma
and the tau decays tau -> e gamma and tau -> mu gamma. If the Dirac neutrino
Yukawa couplings are degenerate but the low energy neutrino masses are not
degenerate, then the lepton decays are related among them by the V_M entries.
On the other hand, if the Dirac neutrino Yukawa couplings are hierarchical or
the low energy neutrino masses are degenerate, then the prediction for the
lepton decays comes from the U_{CKM} hierarchy.


title:
Quenching of Hadron Spectra in a chemically equilibrating Quark-Gluon
  Plasma

abstract:
  Using the Fokker-Planck equation we have studied the drag co-efficient $A(t)$
and the consequent shift $\Delta p_\perp (L)$ in the transverse momentum due to
collisional energy loss of energetic partons while passing through a chemically
equilibrating quark-gluon plasma. Based on these we estimate the quenching
factor $Q(p_\perp)$ when the medium is undergoing longitudinal expansion
governed by master rate equations. In contrast to the case of chemically
equilibrated plasma investigated earlier by Mustafa and Thoma \cite{mus} we
find less quenching because our calculated $Q(p_\perp)$ is always greater at
all momenta. This result is attributed to the weak drag coefficient operating
during initial state interactions.


title:
Remark on the minimal seesaw model and leptogenesis with tri/bi-maximal
  mixing

abstract:
  We have studied a leptogenesis scenario in the framework of the minimal
seesaw model with tri/bi-maximal mixing. Usually, at least one of the elements
in the Dirac mass matrix is fixed to be zero, for example, we denote it by
$b_2=0$. We have pointed out that the absolute value of the CP asymmetry has
several minimums and maximums with non-zero $b_2$. Thus one can expect that
more rich phenomena, such as an enhanced leptogenesis, are hidden in the $b_2
\neq 0$ space.


title: Light Four-quark States and New Observations by BES

abstract:
  Four-quark states are discussed within the constituent quark model.
Incompleteness of existed studies of four-quark state with QCD sum rule is
analyzed. The masses of diquark cluster were determined by QCD sum rules, and
light four-quark states masses were obtained in terms of the diquark. The
four-quark state possibility of the newly observed near-threshold p\bar p
enhancement, X(1835), X(1812) and X(1576) by BES is discussed.


title:
Oscillatory behavior of the in-medium interparticle potential in hot
  gauge system with scalar bound states

abstract:
  We investigate the in-medium interparticle potential of hot gauge system with
bound states by employing the QED and scalar QED coupling. At finite
temperature an oscillatory behavior of the potential has been found as well as
its variation in terms of different free parameters. We expect the competition
among the parameters will lead to an appropriate interparticle potential which
could be extended to discuss the fluid properties of QGP with scalar bound
states.


title: Nonperturbative dynamics in the colour-magnetic QCD vacuum

abstract:
  In the deconfinement phase of QCD quarks and gluons interact with the dense
stochastic colour-magnetic vacuum. We consider the dynamics of quarks in this
deconfinement phase using the Field Correlators Method and derive an effective
nonperturbative inter-quark potential, in addition to the usual perturbative
short-ranged interaction. We find the resulting angular-momentum-dependent
interaction to be attractive enough to maintain bound states and, for light
quarks (and gluons), to cause emission of quark and gluon pairs. Possible
consequences for the strong interacting quark--gluon plasma are briefly
discussed.


title: Four-loop pressure of massless O(N) scalar field theory

abstract:
  Inspired by the corresponding problem in QCD, we determine the pressure of
massless O(N) scalar field theory up to order g^6 in the weak-coupling
expansion, where g^2 denotes the quartic coupling constant. This necessitates
the computation of all 4-loop vacuum graphs at a finite temperature: by making
use of methods developed by Arnold and Zhai at 3-loop level, we demonstrate
that this task is manageable at least if one restricts to computing the
logarithmic terms analytically, while handling the ``constant'' 4-loop
contributions numerically. We also inspect the numerical convergence of the
weak-coupling expansion after the inclusion of the new terms. Finally, we point
out that while the present computation introduces strategies that should be
helpful for the full 4-loop computation on the QCD-side, it also highlights the
need to develop novel computational techniques, in order to be able to complete
this formidable task in a systematic fashion.


title: Top-quark FCNC Productions at LHC in Topcolor-assisted Technicolor Model

abstract:
  We evaluate the top-quark FCNC productions induced by the topcolor assisted
technicolor (TC2) model at the LHC. These productions proceed respectively
through the parton-level processes g g -> t c_bar, c g->t, c g -> t g, c g -> t
Z and c g -> t \gamma. We show the dependence of the production rates on the
relevant TC2 parameters and compare the results with the predictions in the
minimal supersymmetric model. We find that for each channel the TC2 model
predicts a much larger production rate than the supersymmetric model. All these
rare productions in the TC2 model can be enhanced above the 3-sigma sensitivity
of the LHC. Since in the minimal supersymmetric model only c g -> t is slightly
larger than the corresponding LHC sensitivity, the observation of these
processes will favor the TC2 model over the supersymmetric model. In case of
unobservation, the LHC can set meaningful constraints on the TC2 parameters.


title: A new perspective on gluon distribution at small x

abstract:
  The corrections of the gluon fusion to the BFKL equation in a unified
partonic framework are studied. This modified BFKL equation predicts a stronger
shadowing, which suppresses the gluon density and even leads to the gluon
disappearance below the saturation region. We suggest that this unexpected
effect is caused by a possible chaotic solution of the new equation.


title: Dark Matter -- Possible Candidates and Direct Detection

abstract:
  The cosmological observations coupled with theoretical calculations suggest
the existence of enormous amount of unseen and unknown matter or dark matter in
the universe. The evidence of their existence, the possible candidates and
their possible direct detections are discussed.


title: Six-Photon Amplitudes

abstract:
  We present analytical results for all six-photon helicity amplitudes. For the
computation of this loop induced process two recently developed methods, based
on form factor decomposition and on multiple cuts, have been used. We obtain
compact results, demonstrating the applicability of both methods to one-loop
amplitudes relevant to precision collider phenomenology.


title: Photon Production from Charge-Asymmetric Hot and Dense Matter

abstract:
  A new channel of direct photon production from a quark gluon plasma (QGP) is
explored. This process appears at Next-to-Leading-Order in the presence of a
charge asymmetry in the heated matter and may be effectively described as the
bremsstrahlung of a real photon from a thermal gluon. The photon production
from this new mechanism is calculated in the effective theory of QCD at high
temperature. The results show that the photon production rate may not as big as
the annihilation and Compton scattering at low baryon density, but could become
important in baryon-rich matter.


title: Lorentz Conserving Noncommutative Standard Model

abstract:
  We consider Lorentz conserving noncommutative field theory to construct the
Lorentz conserving noncommutative standard model based on the gauge group
$SU(3)\times SU(2)\times U(1)$. We obtain the enveloping algebra-valued of
Higgs field up to the second order of the noncommutativity parameter
$\th_{\mu\nu}$. We derive the action at the leading order and find new vertices
which are absent in the ordinary Standard Model as well as the minimal
noncommutative standard model. We briefly study the phenomenological aspects of
the model.


title: V_us (and m_s) From Hadronic Tau Decays

abstract:
  We describe how complications encountered in the extraction of V_us from
flavor-breaking hadronic tau decay sum rules, in particular those associated
with the slower than previously anticipated convergence of the relevant D=2 OPE
series, can be successfully dealt with through judicious choices of sum rule
weight. Problems with the previously proposed ``(0,0) spectral weight'' version
of the analysis, and the much improved situation produced by the use of a
number of alternate, non-spectral-weights, are demonstrated. The method is
shown to promise a sub-0.0010-accuracy determination of V_us once analysis of
the improved strange spectral data from BABAR and BELLE is completed.
Connections to the tau versus electroproduction puzzle in the evaluation of the
leading order hadronic contribution to (g-2)_mu are also discussed.


title: Diffractive hadroproduction of W and Z bosons at high energies

abstract:
  Results from a phenomenological analysis of $W$ and $Z$ hard diffractive
hadroproduction at high energies are reported. Using the Regge factorization
approach, we consider the recent diffractive parton density functions extracted
by the H1 Collaboration at DESY-HERA. In addition, we take into account
multiple Pomeron exchange corrections considering a gap survival probability
factor. It is find that the ratio of diffractive to non-diffractive boson
production is in good agreement with the CDF and D0 data. We make predictions
which could be compared to future measurements at the LHC.


title: On the light glueball spectrum in a holographic description of QCD

abstract:
  We investigate the spectra of light scalar and vector glueballs in a
holografic description of QCD with a dilaton background bulk field. In
particular, we study how the glueball masses depend on the conditions on the
dilaton background and on the geometry of the bulk.


title: Markovian Monte Carlo solutions of the one-loop CCFM equations

abstract:
  A systematic extension of the Monte Carlo (MC) algorithm, that solves the
DGLAP equation, into the so-called the one-loop CCFM evolution is presented.
Modifications are related to a z-dependent coupling constant; transverse
momentum dependence is added to the x-dependence of the parton distributions.
The presented Markovian algorithm for one-loop CCFM evolution is the first step
in extending it to other more sophisticated schemes beyond DGLAP. In
particular, implementing the complete CCFM will be the next step. The presently
implemented one-loop CCFM option will be a useful tool in testing the
forthcoming MC solutions. Numerical results of the new MC are confronted with
other non-MC numerical solutions. The agreement within the MC statistical error
of ~0.1% is found. Also, numerical results for kT-dependent structure functions
are presented.


title:
The neutrino mass scale and the mixing angle $\theta_{13}$ for
  quasi-degenerate Majorana neutrinos

abstract:
  Considering a general mass matrix for quasi-degenerate neutrinos and treating
the experimentally known oscillation parameters as inputs, we study the
correlation between the degenerate mass scale $(m)$ and the mixing angle
$\theta_{13}$. We find that, corresponding to different values of $m$, there
exist upper bounds on $\theta_{13}$, so that a precise determination of the
latter in future may put upper limit on the former, and vice versa. One can
also find a possible correlation between $m$ and lower bound of $\theta_{13}$,
depending on the relative strength of the unperturbed degenerate mass matrix
and the perturbation. The possible constraints on the parameters of few models
of quasi-degenerate neutrinos are briefly discussed.


title: A note on the moduli-induced gravitino problem

abstract:
  The cosmological moduli problem has been recently reconsidered. Papers [1,2]
show that even heavy moduli (m_\phi > 10^5 GeV) can be a problem for cosmology
if a branching ratio of the modulus into gravitini is large. In this paper, we
discuss the tachyonic decay of moduli into the Standard Model's degrees of
freedom, e.g. Higgs particles, as a resolution to the moduli-induced gravitino
problem. Rough estimates on model dependent parameters set a lower bound on the
allowed moduli at around 10^8 ~ 10^9 GeV.


title:
GASTOF: Ultra-fast ToF forward detector for exclusive processes at the
  LHC

abstract:
  GASTOF (Gas Time-of-Flight) detector is a Cherenkov detector proposed for
very precise (10--20 ps) arrival time measurements of forward protons at some
420 m from the central detectors of CMS and ATLAS. Such an excellent time
resolution will allow by z-by-timing technique for precise measurement of the
z-coordinate of the event vertex in exclusive production at the LHC, when two
colliding protons are scattered at very small angles. In the paper we present
first GASTOF prototype, simulations of its performance as well as first tests
using a cosmic muon telescope.