title:
$B\to \eta^{(\prime)} (\ell^{-} \bar\nu_{\ell}, \ell^{+} \ell^{-}, K,
  K^*)$ decays in the quark-flavor mixing scheme

abstract:
  In the quark-flavor mixing scheme, $\eta$ and $\eta'$ are linear combinations
of flavor states $\eta_{q}=(u\bar{u}+d\bar{d})/\sqrt{2}$ and
$\eta_{s}=s\bar{s}$ with the masses of $m_{qq}$ and $m_{ss}$, respectively.
Phenomenologically, $m_{ss}$ is strictly fixed to be around 0.69, which is
close to $\sqrt{2m^{2}_{K}-m^{2}_{\pi}}$ by the approximate flavor symmetry,
while $m_{qq}$ is found to be $0.18\pm 0.08$ GeV. For a large allowed value of
$m_{qq}$, we show that the BRs for $B\to \eta^{(\prime)} X$ decays with
$X=(\ell^{-} \bar\nu_{\ell}, \ell^{+} \ell^{-})$ are enhanced. We also
illustrate that $BR(B\to\eta X)> BR(B\to \eta^{\prime} X)$ in the mechanism
without the flavor-singlet contribution. Moreover, we demonstrate that the
decay branching ratios (BRs) for $B\to \eta^{(\prime)}K^{[*]}$ are consistent
with the data. In particular, the puzzle of the large $BR(B\to \eta^{\prime}
K)$ can be solved. In addition, we find that the CP asymmetry for $B^{\pm}\to
\eta K^{\pm}$ can be as large as -30%, which agrees well with the data.
However, we cannot accommodate the CP asymmetries of $B\to \eta K^*$ in our
analysis, which could indicate the existence of some new CP violating sources.


title: A spinorial perspective on massless photons

abstract:
  We exploit the fact that, in Minkowski space-time, gamma matrices are
possibly more fundamental than the metric to describe how gauge invariance at
perturbative level enforces a Lagrangian for spinor electrodynamics with
massless photons. The term quadratic in the potential arises naturally in the
gauge-fixed Lagrangian but has vanishing coefficient.


title: Constraints on SUSY Seesaw from Leptogenesis and LFV

abstract:
  We study constraints on the fundamental parameters of supersymmetric type I
seesaw models imposed by neutrino data, charged lepton flavor violation,
thermal leptogenesis and perturbativity of the neutrino Yukawa couplings.


title: Cronin effect in the Drell-Yan reaction

abstract:
  We explore the mechanism of transverse momentum broadening of fast quarks
propagating in nuclei, using Drell-Yan (DY) transverse momentum distributions
measured in the experiment E866 at FermiLab with beams of 800 GeV protons. Our
theoretical analysis is based on the color dipole approach in the target rest
frame, which has provided a successful phenomenological description of a
variety of hadronic reactions. The present application is relevant to the
regime of short coherence length (SCL), where the spatial extent of the
fluctuations of the projectile responsible for the Drell-Yan reaction is short
compared to the internucleon spacing. In this limit, momentum broadening comes
from initial state interactions and is described as color filtering, i.e.
absorption of large-size dipoles leading to diminished transverse separation
and hence enhanced transverse momentum. The predictions we present are in good
agreement with the E866 data. The interactions leading to the acquisition of
transverse momentum arise from the color-dipole cross section determined
previously from deep-inelastic scattering on proton targets. Aside from the
determination of the color-dipole cross section, no other phenomenological
input is needed to explain the experimental results. The mean-square momentum
broadening of dileptons determined in a recent separate analysis of the data is
likewise well described by our theory. These results confirm that the origin of
momentum broadening in DY is the color dipole cross section mediating soft
initial state interactions between the parton of the projectile that initiates
the reaction and the nucleons of the nucleus, as provided by the color dipole
description. Predictions for broadening observables at RHIC are presented.


title: New Lepton Family Symmetry and Neutrino Tribimaximal Mixing

abstract:
  The newly proposed finite symmetry Sigma(81) is applied to the problem of
neutrino tribimaximal mixing. The result is more satisfactory than those of
previous models based on A_4 in that the use of auxiliary symmetries (or
mechanisms) may be avoided. Deviations from the tribimaximal pattern are
expected, but because of its basic structure, only tan^2 (theta_12) may differ
significantly from 0.5 (say 0.45) with sin^2 (2 theta_23) remaining very close
to one, and theta_13 very nearly zero.


title:
Lepton flavor violating signals of a little Higgs model at the high
  energy linear $e^{+}e^{-}$ colliders

abstract:
  Littlest Higgs $(LH)$ model predicts the existence of the doubly charged
scalars $\Phi^{\pm\pm}$, which generally have large flavor changing couplings
to leptons. We calculate the contributions of $\Phi^{\pm\pm}$ to the lepton
flavor violating $(LFV)$ processes $l_{i}\to l_{j}\gamma$ and $l_{i}\to
l_{j}l_{k}l_{k}$, and compare our numerical results with the current
experimental upper limits on these processes. We find that some of these
processes can give severe constraints on the coupling constant $Y_{ij}$ and the
mass parameter $M_{\Phi}$. Taking into account the constraints on these free
parameters, we further discuss the possible lepton flavor violating signals of
$\Phi^{\pm\pm}$ at the high energy linear $e^{+}e^{-}$ collider $(ILC)$
experiments. Our numerical results show that the possible signals of
$\Phi^{\pm\pm}$ might be detected via the subprocesses $e^{\pm}e^{\pm}\to
l^{\pm}l^{\pm}$ in the future $ILC$ experiments.


title: A_4 Symmetry and Lepton Masses and Mixing

abstract:
  Stimulated by Ma's idea which explains the tribimaximal neutrino mixing by
assuming an A_4 flavor symmetry, a lepton mass matrix model is investigated. A
Frogatt-Nielsen type model is assumed, and the flavor structures of the masses
and mixing are caused by the VEVs of SU(2)_L-singlet scalars \phi_i^u and
\phi_i^d (i=1,2,3), which are assigned to {\bf 3} and ({\bf 1}, {\bf 1}',{\bf
1}'') of A_4, respectively.


title:
Universal Higher Order Singlet QED Corrections to Unpolarized Lepton
  Scattering

abstract:
  We calculate the universal flavor-singlet radiative QED corrections to
unpolarized lepton scattering applicable to general differential scattering
cross sections, involving charged fermions or photons in initial or final
states. The radiators are derived to $O((\alpha \ln(Q^2/m_f^2))^5)$ in analytic
form. Numerical illustrations are given.


title:
Decays of $J/\psi$ and $\psi^\prime$ into vector and pseudoscalar meson
  and the pseudoscalar glueball-$q\bar{q}$ mixing

abstract:
  We introduce a parametrization scheme for $J/\psi(\psi^\prime)\to VP$ where
the effects of SU(3) flavor symmetry breaking and doubly OZI-rule violation
(DOZI) can be parametrized by certain parameters with explicit physical
interpretations. This scheme can be used to clarify the glueball-$q\bar{q}$
mixing within the pseudoscalar mesons. We also include the contributions from
the electromagnetic (EM) decays of $J/\psi$ and $\psi^\prime$ via
$J/\psi(\psi^\prime)\to \gamma^*\to VP$. Via study of the isospin violated
channels, such as $J/\psi(\psi^\prime)\to \rho\eta$, $\rho\eta^\prime$,
$\omega\pi^0$ and $\phi\pi^0$, reasonable constraints on the EM decay
contributions are obtained. With the up-to-date experimental data for
$J/\psi(\psi^\prime)\to VP$, $J/\psi(\psi^\prime)\to \gamma P$ and $P\to
\gamma\gamma$, etc, we arrive at a consistent description of the mentioned
processes with a minimal set of parameters. As a consequence, we find that
there exists an overall suppression of the $\psi^\prime\to 3g$ form factors,
which sheds some light on the long-standing "$\rho\pi$ puzzle". By determining
the glueball components inside the pseudoscalar $\eta$ and $\eta^\prime$ in
three different glueball-$q\bar{q}$ mixing schemes, we deduce that the lowest
pseudoscalar glueball, if exists, has rather small $q\bar{q}$ component, and it
makes the $\eta(1405)$ a preferable candidate for $0^{-+}$ glueball.


title:
Clean Signals of CP-violating and CP-conserving New Physics in B->P V
  gamma Decays at B Factories and Hadron Colliders

abstract:
  In radiative B decays to final states containing one spin zero meson, one
spin one meson and a photon, the photon polarization can be measured from the
angular distribution of the final state. The P-odd, C-even components of this
distribution lead to triple correlation asymmetries that are very sensitive to
new physics as they are likely to receive only tiny contributions from the
Standard Model. There are also (CP-conserving) forward-backward asymmetries to
which there may be SM contributions of a few percent; nevertheless there is a
data driven means to overcome the SM ``pollution''. These latter observables
can be used to search for a class of New Physics which does not necessarily
possess a new CP-odd phase, and wherein the current structure is different from
the left-handed electroweak theory of the Standard Model. The mode $B^\pm \to
K^\pm \phi \gamma$ is particularly useful due to the relatively large branching
ratio and its distinctive final state but there are dozens of such final states
in the decays of $B_u$, $B_d$ and $B_s$ mesons where the analysis is
applicable. In many cases, after the decay of the spin one resonance, several
of these channels lead to only charged mesons and a photon in the final state,
so they may well be accessible in a hadronic environment in addition, of
course, to $e^+ e^-$ (Super) $B$ Factories. In passing we also briefly explain
why the CP-conserving forward-backward asymmetries in $B \to P V \gamma$ decays
is a more reliable signal of new physics compared to the (CP-conserving)
transverse polarization in $B \to V_1 V_2$ modes even though, of course, the
latter may be somewhat more abundant.


title: X(1576) and the Final State Interaction Effect

abstract:
  We study whether the broad peak X(1576) observed by BES Collaboration arises
from the final state interaction effect of $\rho(1450,1700)$ decays. The
interference effect could produce an enhancement around 1540 MeV in the
$K^+K^-$ spectrum with typical interference phases. However, the branching
ratio $B[J/\psi\to \pi^{0}\rho(1450,1700)]\cdot B[\rho(1450,1700)\to
K^{+}K^{-}]$ from the final state interaction effect is far less than the
experimental data.


title: Expectations on $B\to (K^*_{0}(1430),K^*_{2}(1430))\phi$ decays

abstract:
  As the annihilation contributions play important roles in solving the puzzle
of the small longitudinal polarizations in $B\to K^* \phi$ decays, we examine
the similar effects in the decays of $B\to K^*_{0,2}(1430) \phi$. For the
calculations on the annihilated contributions, we adopt that the form factors
in $B\to K^{(*)} \phi$ decays are parameters determined by the observed
branching ratios (BRs), polarization fractions (PFs) and relative angles in
experiments and we connect the parameters between $B\to K^*_{0(2)} \phi$ and
$B\to K^{(*)}\phi$ by the ansatz of correlating $\la K^*_n(1430) \phi|
(V-A)_{\mu}|0\ra$ to $\la K^{(*)} \phi| (V-A)_{\mu}|0\ra$. We find that the BR
of $B_d\to K^{*0}_{0}(1430) \phi$ is $(3.69 \pm 0.47)\times 10^{-6}$. By using
the transition form factors of $B\to K^*_2(1430)$ in the light-front quark
model (LFQM) and the 2nd version of Isgur-Scora-Grinstein-Wise (ISGW2), we show
that BR of $B_d\to K^{*0}_{2}(1430)\phi$ is a broad allowed value and
$(1.70\pm0.80)\times 10^{-6}$, respectively. In terms of the recent BABAR's
observations on BRs and PFs in $B_d\to K^{*0}_{2}(1430)\phi $, the results in
the LFQM are found to be more favorable. In addition, due to the annihilation
contributions to $B\to K^*_2\phi$ and $B\to K^*\phi$ being opposite in sign, we
demonstrate that the longitudinal polarization of $B_d\to K^{*0}_2(1430) \phi$
is always O(1) with or without including the annihilation contributions.


title: Generating curvature perturbations with or without MSSM flat directions

abstract:
  We consider instant preheating as the mechanism for generating the curvature
perturbation at the end of chaotic inflation. Then we examine if inflation
could be driven by a Minimal Supersymmetric Standard Model (MSSM) flat
direction or a sneutrino. Our simple mechanism relaxes some serious constraints
that appeared in past studies, making inflation driven by a MSSM flat direction
or a sneutrino more plausible.


title:
Experimental status of the $\pi\pi$ isoscalar S wave at low energy:
  $f_0(600)$ pole and scattering length

abstract:
  The experimental results obtained in the last few years on kaon decays
(K$\to2\pi$ and, above all, Ke4 decays) allow a reliable, model independent
determination of low energy $\pi\pi$ scattering in the S0 wave. Using them and,
eventually, other sets of data, it is possible to give a precise
parametrization of the S0 wave as well as to find the scattering length and
effective range parameter. One can also perform an extrapolation to the pole of
the "$\sigma$ resonance" [$f_0(600)$]. We obtain the results
$$a_0^{(0)}=0.233\pm0.013 M^{-1}_\pi,\quad b_0^{(0)}=0.285\pm0.012 M^{-3}_\pi$$
and, for the $\sigma$ pole, $$M_\sigma=484\pm17 \mev,\quad\gammav_\sigma/2=
255\pm10 {\rm MeV}.$$


title: Decay rates of Quarkonia in the NRQCD formalism

abstract:
  Decay rates of $c\bar c$ and $b\bar b$ mesons have been studied within the
NRQCD formalism. The basic parameters of the formalism have been obtained from
different potential schemes studied for the quarkonia spectra. The present
results are compared with other potential model results with and without
correction terms proposed through hard gluon processes involved in the decay.


title: Calculation of the two-photon decay width of the f_0(980) scalar meson

abstract:
  The applicability of the quasi-static approximation for calculating the
two-photon annihilation rate of the scalar f_0(980) meson envisaged as a K\bar
K molecule is critically re-examined. It is shown that the validity of this
approximation depends on the detailed interplay between the momentum dependence
of the annihilation amplitude and the momentum transform of the bound state
wave function of the annihilating pair. The approximation becomes invalid when
these two scales of variation are similar. An improved method of calculation
based on the inclusion of electromagnetic corrections to the kernel of the
Bethe-Salpeter equation for the interacting K\bar K pair is outlined to cover
this case and applied to re-evaluate the two-photon decay width for f_0(980) in
a one boson exchange model for the interkaon interaction. The corrections are
significant and result in a much better agreement with experiment.


title: The diquark and elastic pion-proton scattering at high energies

abstract:
  Small momentum transfer elastic pion-proton cross-section at high energies is
calculated assuming the proton is composed of two constituents, a quark and a
diquark. We find that it is possible to fit very precisely the data when (i)
the pion acts as a single entity (no constituent quark structure) and (ii) the
diquark is rather large, comparable to the size of the proton.


title: Chemical Equilibrium in Heavy Ion Collisions: Rapidity Dependence

abstract:
  Particle yields in heavy ion collisions show an overwhelming evidence for
chemical or relative chemical equilibrium at all beam energies. The rapidity
dependence of the thermal parameters $T$ and $\mu_B$ can now be determined over
a wide range of rapidities and show a systematic behavior towards an increase
in $\mu_B$ away from mid-rapidity.


title: Inclusive radiative decays of charmonium

abstract:
  We discuss the theoretical status of inclusive radiative decays of
charmonium, with a particular emphasis on the QCD description of the photon
spectrum, where progress has occurred in recent years. We also comment on the
possible extraction of alpha_s (M_J/psi) and on the possibility to gain
important information on the nature of J/psi and psi (2S).


title: Decoherence of domains and defects at phase transitions

abstract:
  In this further letter on the onset of classical behaviour in field theory
due to a phase transition, we show that it can be phrased easily in terms of
the decoherence functional, without having to use the master equation. To
demonstrate this, we consider the decohering effects due to the displacement of
domain boundaries, with implications for the displacement of defects, in
general. We see that decoherence arises so quickly in this event, that it is
negligible in comparison to decoherence due to field fluctuations in the way
defined in our previous papers.

categories: hep-ph astro-ph cond-mat.other gr-qc hep-th quant-ph


title:
From Sakata Model to Goldberg-Ne'eman Quarks and Nambu QCD Phenomenology
  and "Right" and "Wrong" experiments

abstract:
  The basic theoretical milestones were the Sakata SU(3) symmetry, the
Goldberg-Ne'eman composite model with SU(3) triplets having baryon number (1/3)
and the Nambu color gauge Lagrangian. The transition was led in right and wrong
directions by experiments interpreted by phenomenology. A "good" experiment on
$\bar p p$ annihilation at rest showed that the Sakata model predictions
disagreed with experiment. A "bad" experiment prevented the use of the
Goldberg-Ne'eman triplet model to predict the existence and masses of the of
the $\Xi^*$ and $\Omega^-$. More "good" experiments revealed the existence and
mass of the $\Xi^*$ and the $\Omega^-$ and the absence of positive strangeness
baryon resonances, thus confirming the "tenfold way". Further "good
experiments" revealed the existence of the vector meson nonet, SU(3) breaking
with singlet-octet mixing and the suppression of the $\phi \to \rho \pi$ decay.
These led to the quark triplet model. The paradox of peculiar statistics then
arose as the $\Delta^{++}$ and $\Omega^-$ contained three identical spin-1/2
fermions coupled symmetrically to spin (3/2). This led to color and the Nambu
QCD. The book "Lie Groups for Pedestrians" used the Sakata model with the name
"sakaton" for the $pn\Lambda$ triplet to teach the algebra of SU(3) to particle
physicists in the U.S. and Europe who knew no group theory. The Sakata model
had a renaissance in hypernuclear physics in the 1970's.


title:
Pion Condensation in a two-flavor NJL model: the role of charge
  neutrality

abstract:
  We study pion condensation and the phase structure in a two-flavor
Nambu-Jona-Lasinio model in the presence of baryon chemical potential $\mu$ and
isospin chemical potential $\mu_I$at zero and finite temperature. There is a
competition between the chiral condensate and a Bose-Einstein condensate of
charged pions. In the chiral limit, the chiral condensate vanishes for any
finite value of the isospin chemical potential, while there is a charged pion
condensate that depends on the chemical potentials and the temperature. At the
physical point, the chiral condensate is always nonzero, while the charged pion
condensate depends on $\mu_I$ and $T$. For $T=\mu=0$, the critical isospin
chemical potential $\mu_I^c$ for the onset of Bose-Einstein condensation is
always equal to the pion mass. For $\mu=0$, we compare our results with chiral
perturbation theory, sigma-model calculations, and lattice simulations. We
examine the effects of imposing electric charge neutrality and weak equilibrium
on the phase structure of the model. In the chiral limit, there is a window of
baryon chemical potential and temperature where the charged pions condense. At
the physical point, the charged pions do not condense.


title: Group Theoretic Bases for Tribimaximal Mixing

abstract:
  Present data on neutrino masses and mixing favor the highly symmetric
tribimaximal neutrino mixing matrix which suggests an underlying flavor
symmetry. A systematic study of non-abelian finite groups of order $g \leq 31$
reveals that tribimaximal mixing can be derived not only from the well known
flavor symmetry $T \equiv A_4$, the tetrahedral group, but also by using the
alternative flavor symmetry X(24) $\equiv SL_2(F_3) \equiv Q_4 \tilde{\times}
Z_3$. X(24) does not contain the tetrahedral group as a subgroup, and has the
advantage over it as a flavor symmetry that it can not only underwrite
bitrimaximal mixing for neutrinos, equally as well, but also provide a first
step to understanding the quark mass hierarchy.


title:
Narrow Trans-TeV Higgs Bosons and $H\to hh$ Decays: Two LHC Search Paths
  for a Hidden Sector Higgs Boson

abstract:
  We consider the addition of a condensing singlet scalar field to the Standard
Model. Such a scenario may be motivated by any number of theoretical ideas,
including the common result in string-inspired model building of singlet scalar
fields charged under some hidden sector gauge symmetry. For concreteness, we
specify an example model of this type, and consider the relevant constraints on
Higgs physics, such as triviality, perturbative unitarity and precision
electroweak analysis. We then show that there are two unique features of the
phenomenology that present opportunities for discovery at the Large Hadron
Collider (LHC). First, it is possible to identify and discover a narrow
trans-TeV Higgs boson in this scenario -- a mass scale that is well above the
scale at which it is meaningful to discuss a SM Higgs boson. Second, the decays
of the heavier scalar state into the lighter Higgs bosons can proceed at a high
rate and may be the first discovery mode in the Higgs sector.


title: Braneworld Quintessential Inflation and Sum of Exponentials Potentials

abstract:
  Quintessential inflation--in which a single scalar field plays the role of
the inflaton and quintessence--from a sum of exponentials potential V = A
(exp{5 phi}+exp{sqrt{2} phi}) or V = A (exp{5 phi}+exp{phi}) or a cosh
potential V = 2A cosh(5 phi) is considered in the context of five-dimensional
gravitation with standard model particles confined to our 3-brane. Reheating is
accomplished via gravitational particle production and the universe undergoes a
transition from primordial inflation to radiation domination well before big
bang nucleosynthesis. The transition to an accelerating universe due to
quintessence occurs near z = 1, as in LambdaCDM.
  Braneworld quintessential inflation can occur for potentials with or without
a minimum, and with or without eternal acceleration and an event horizon. The
low z behavior of the equation of state parameter w_phi provides a clear
observable signal distinguishing quintessence from a cosmological constant.


title: Joint Extraction of m_s and V_us from Hadronic Tau Decays

abstract:
  We study the simultaneous determination of m_s and V_us from flavor-breaking
hadronic tau decay sum rules using weights designed to bring under better
control problems associated with the slow convergence of the relevant D=2 OPE
series. Much improved stability and consistency is found as compared to the
results of conventional analyses based on the ``(k,0) spectral weights''.
Results for m_s are in excellent agreement with those of recent strange scalar
and strange pseudoscalar sum rule analyses, as well as recent lattice analyses,
while those for V_us agree within errors with the output from recent
lattice-based Gamma[K_{mu 2}]/Gamma[pi_{mu 2}] and K_{\ell 3}-based analyses.
Very significant error reductions are shown to be expected, especially for
V_us, once the improved strange spectral data from the B factory experiments
becomes available.


title: Ordinary and Extraordinary Hadrons

abstract:
  Resonances and enhancements in meson-meson scattering can be divided into two
classes distinguished by their behavior as the number of colors N_c in QCD
becomes large: The first are ordinary mesons that become stable as N_c goes to
infinity. This class includes textbook q-bar q mesons as well as glueballs and
hybrids. The second class, extraordinary mesons, are enhancements that
disappear as N_c goes to infinity; they subside into the hadronic continuum.
This class includes indistinct and controversial objects that have been
classified as q-bar q-bar q q mesons or meson-meson molecules. Pelaez's study
of the N_c dependence of unitarized chiral dynamics illustrates both classes:
the p-wave pi-pi and K-pi resonances, the rho(770) and K*(892), behave as
ordinary mesons; the s-wave pi-pi and K-pi enhancements, the sigma(600) and
kappa(800), behave like extraordinary mesons. Ordinary mesons resemble Feshbach
resonances while extraordinary mesons look more like effects due to potentials
in meson-meson scattering channels. I build and explore toy models along these
lines. Finally I discuss some related dynamical issues affecting the
interpretation of extraordinary mesons.


title:
Chiral symmetry patterns of excited mesons with the Coulomb-like linear
  confinement

abstract:
  The spectrum of $\bar q q$ mesons in a model where the only interaction is a
linear Coulomb-like instantaneous confining potential is studied. The
single-quark Green function as well as the dynamical chiral symmetry breaking
are obtained from the Schwinger-Dyson (gap) equation. Given the dressed quark
propagator, a complete spectrum of "usual" mesons is obtained from the
Bethe-Salpeter equation. The spectrum exhibits restoration of chiral and
$U(1)_A$ symmetries at large spins and/or radial excitations. This property is
demonstrated both analytically and numerically. At large spins and/or radial
excitations higher degree of degeneracy is observed, namely all states with the
given spin fall into reducible representations $[(0,1/2) \oplus (1/2,0)] \times
[(0,1/2) \oplus (1/2,0)]$ that combine all possible chiral multiplets with the
given $J$ and $n$. The structure of the meson wave functions as well as the
form of the angular and radial Regge trajectories are investigated.


title: Little Higgs models with a light T quark

abstract:
  We study Little Higgs models based on a SU(3)_1 x SU(3)_2 global symmetry and
with two scales (the two vacuum expectation values f_{1,2}) substantially
different. We show that all the extra vector boson fields present in these
models may be much heavier than the vectorlike T quark necessary to cancel
top-quark quadratic corrections. In this case the models become an extension of
the standard model with a light (500 GeV) T quark and a scalar Higgs field with
a large singlet component. We obtain that the Yukawa and the gauge couplings of
the Higgs are smaller than in the standard model, a fact that reduces
significantly the Higgs production rate through glu-glu and WW fusion. The
T-quark decay into Higgs boson becomes then a dominant Higgs production channel
in hadron colliders.


title: Tensor and vector formulations of resonance effective theory

abstract:
  The main idea of the first order formalism is demonstrated on a toy example
of spin-0 particle. The full formalism for spin-1 is applied to the vector
formfactor of the pion and its high-energy behaviour is studied.


title: Anomaly-Induced Inflaton Decay and Gravitino-Overproduction Problem

abstract:
  We point out that the inflaton spontaneously decays into any gauge bosons and
gauginos via the super-Weyl, Kahler and sigma-model anomalies in supergravity,
once the inflaton acquires a non-vanishing vacuum expectation value. In
particular, in the dynamical supersymmetry breaking scenarios, the inflaton
necessarily decays into the supersymmetry breaking sector, if the inflaton mass
is larger than the dynamical scale. This generically causes the overproduction
of the gravitinos, which severely constrains the inflation models.


title:
Bulk black hole, escaping photons, and bounds on violations of Lorentz
  invariance

abstract:
  There are reasons (which we enumerate) to think that an infinite extra
dimension will harbor a black hole. In this case, brane-localized modes of
gravity and gauge fields become quasilocalized, and light from a distant object
can become extinct as it is lost to the black hole. In a concrete scenario,
where the photon is localized by gravity, we find that the extinction rate for
propagating photons is at least comparable to the correction to the real part
of the frequency. That results, for example, in a stringent bound on
renormalization of the speed of light.


title: Topological Physics of Little Higgs Bosons

abstract:
  Topological interactions will generally occur in composite Higgs or Little
Higgs theories, extra-dimensional gauge theories in which A_5 plays the role of
a Higgs boson, and amongst the pNGB's of technicolor. This phenomena arises
from the chiral and anomaly structure of the underlying UV completion theory,
and/or through chiral delocalization in higher dimensions. These effects are
described by a full Wess-Zumino-Witten term involving gauge fields and pNGB's.
We give a general discussion of these interactions, some of which may have
novel signatures at future colliders, such as the LHC and ILC.


title:
Two gamma quarkonium and positronium decays with Two-Body Dirac
  equations of constraint dynamics

abstract:
  Two-Body Dirac equations of constraint dynamics provide a covariant framework
to investigate the problem of highly relativistic quarks in meson bound states.
This formalism eliminates automatically the problems of relative time and
energy, leading to a covariant three dimensional formalism with the same number
of degrees of freedom as appears in the corresponding nonrelativistic problem.
It provides bound state wave equations with the simplicity of the
nonrelativistic Schroedinger equation. Unlike other three-dimensional
truncations of the Bethe-Salpeter equation, this covariant formalism has been
thoroughly tested in nonperturbatives contexts in QED, QCD, and nucleon-nucleon
scattering. Here we continue the important studies of this formalism by
extending a method developed earlier for positronium decay into two photons to
tests on the sixteen component quarkonium wave function solutions obtained in
meson spectroscopy. We examine positronium decay and then the two-gamma
quarkonium decays of eta_c, eta'_c, chi_0c, chi_2c, and pi-zero The results for
the pi-zero, although off the experimental rate by 13%, is much closer than the
usual expectations from a potential model.


title: $B\to K^*\ell^+\ell^-$ Forward-backward Asymmetry and New Physics

abstract:
  The forward-backward asymmetry ${\cal A}_{\rm FB}$ in $B\to K^*\ell^+\ell^-$
decay is a sensitive probe of New Physics. Previous studies have focused on the
sensitivity in the position of the zero. However, the short distance effective
couplings are in principle complex, as illustrated by $B\to \rho\ell^+\ell^-$
decay within the Standard Model. Allowing the effective couplings to be
complex, but keeping the $B\to K^*\gamma$ and $K^*\ell^+\ell^-$ rate
constraints, we find the landscape for ${\cal A}_{\rm FB}(B\to
K^*\ell^+\ell^-)$ to be far richer than from entertaining just sign flips,
which can be explored by future high statistics experiments.


title: Y(2175): Distinguish Hybrid State from Higher Quarkonium

abstract:
  The possibility of Y(2175) as a $2{^3D_1}$ $s\bar{s}$ meson is studied. We
study the decay of $2{^3D_1}$ $s\bar{s}$ from both the $^3P_0$ model and the
flux tube model, and the results are similar in the two models. We show that
the decay patterns of $1^{--}$ strangeonium hybrid and $2{^3D_1}$ $s\bar{s}$
are very different. The experimental search of the decay modes $KK$,
$K^{*}K^{*}$, $K(1460)K$, $h_1(1380)\eta$ is suggested to distinguish the two
pictures. Measuring the $K^{*}K^{*}$ partial width ratios is crucial to
discriminate the $2{^3D_1}$ from the $3{^3S_1}$ $s\bar{s}$ assignment.


title: Coulomb force correction to the decay b -> c anti-c s in the threshold

abstract:
  We study the physical origins of the $O(alpha_{s})$ and $O(alpha_{s}^{2})$
corrections to the $bar{c}-s$ current in the decay $b -> c bar{c} s$ in the
threshold region $delta=(M_{b}-2m_{c})/2M_{b} << 1$. We obtain the corrections
which are produced by the Coulomb force between the anti-charm and strange
quarks. The Coulomb corrections $C_{F} pi^{2}$ at $O(alpha_{s})$ and
$-C_{F}^{2} pi^{2} ln delta$ at $O(alpha_{s}^{2})$ account for 300% and 120% of
the corresponding terms in the Abelian-type perturbative corrections
respectively. The differences between the Coulomb and perturbative corrections
imply that other corrections which have other physical origins exist. We also
check that the Wilson coefficient for the anomalous dimension of the $bar{c}-s$
current reproduces the leading and the next-to-leading logarithmic terms in the
perturbative corrections.


title: Polarization puts a New Spin on Physics

abstract:
  Polarization and spin effects are useful for probing the Standard Model, in
both the electroweak sector and the strong sector, where the spin decomposition
of the nucleon is still a hot topic, with important new data on the net
polarizations of the gluon and the strange quarks. Spin phenomena are also
useful in searches for new physics, for example via measurements of the
anomalous magnetic moment of the muon and searches for electric dipole moments.
The cross sections for the direct detection of dark matter may also have an
important spin-dependent component, related to the spin decomposition of the
nucleon, that could be an important diagnostic tool. Polarization effects are
also important diagnostic aids for high-energy experiments at electron-proton,
proton-proton and electron-positron colliders.


title: Large volume behaviour of Yang-Mills propagators

abstract:
  We investigate finite volume effects in the propagators of Landau gauge
Yang-Mills theory using Dyson-Schwinger equations on a 4-dimensional torus. In
particular, we demonstrate explicitly how the solutions for the gluon and the
ghost propagator tend towards their respective infinite volume forms in the
corresponding limit. This solves an important open problem of previous studies
where the infinite volume limit led to an apparent mismatch, especially of the
infrared behaviour, between torus extrapolations and the existing infinite
volume solutions obtained in 4-dimensional Euclidean space-time. However, the
correct infinite volume limit is approached rather slowly. The typical scales
necessary to see the onset of the leading infrared behaviour emerging already
imply volumes of at least 10 to 15 fm in lengths. To reliably extract the
infrared exponents of the infinite volume solutions requires even much larger
ones. While the volumes in the Monte-Carlo simulations available at present are
far too small to facilitate that, we obtain a good qualitative agreement of our
torus solutions with recent lattice data in comparable volumes.


title:
Three-loop corrections to the lightest Higgs scalar boson mass in
  supersymmetry

abstract:
  I evaluate the largest three-loop corrections to the mass of the lightest
Higgs scalar boson in the Minimal Supersymmetric Standard Model in a
mass-independent renormalization scheme, using effective field theory and
renormalization group methods. The contributions found here are those that
depend only on strong and Yukawa interactions and on the leading and
next-to-leading logarithms of the ratio of a typical superpartner mass scale to
the top quark mass. The approximation assumes that all superpartners and the
other Higgs bosons can be treated as much heavier than the top quark, but does
not assume their degeneracy. I also discuss the consistent addition of the
three-loop corrections to a complete two-loop calculation.


title: $X(3872) \to D \bar D \gamma$ decays and the structure of X(3872)

abstract:
  It has been suggested that the radiative $X \to D \bar D \gamma$ decay modes
are useful to shed light on the structure of the meson X(3872), since the ratio
$ R={\Gamma(X \to D^+ D^- \gamma) \over \Gamma(X \to D^0 \bar D^0 \gamma)}$ is
expected to be small ($R \ll 1$) if $X$ is a molecular $D^{*0} \bar D^0$ state.
We compute $R$ in a $\bar c c$ $J^{PC}=1^{++}$ description of $X$ finding that
it is tiny in a wide range of hadronic parameters governing the decay. A
discrimination between the molecular and $\bar c c$ description can be obtained
through the analysis of the photon spectrum.


title: Cosmology and Dark Matter at the LHC

abstract:
  We examine the question of whether neutralinos produced at the LHC can be
shown to be the particles making up the astronomically observed dark matter. If
the WIMP alllowed region lies in the SUGRA coannihilation region, then a strong
signal for this would be the unexpected near degeneracy of the stau and
neutralino i.e., a mass difference \Delta M\simeq (5-15) GeV. For the mSUGRA
model we show such a small mass difference can be measured at the LHC using the
signal 3\tau+jet+E_T^{\rm miss}. Two observables, opposite sign minus like sign
pairs and the peak of the \tau\tau mass distribution allows the simultaneous
determination of \Delta M to 15% and the gluino mass M_{\tilde g} to be 6% at
the benchmark point of M_{\tilde g}=850 GeV, A_0=0, \mu>0 with 30 fb^{-1}. With
10 fb^{-1}, \Delta M can be determined to 22% and one can probe the parameter
space up to m_{1/2}=700 GeV with 100 fb^{-1}.


title: Testing the left-handedness of the b \to c transition

abstract:
  We analyse the spin structure of inclusive semileptonic b \to c transitions
and the effects of non-standard model couplings on the rates and the spectra.
The calculation includes the {\cal O} (\alpha_s) corrections as well as the
leading non-perturbative ones.


title: Electroweak constraints on warped models with custodial symmetry

abstract:
  It has been recently argued that realistic models with warped extra
dimensions can have Kaluza-Klein particles accessible at the Large Hadron
Collider if a custodial symmetry, SU(2)_V \times P_{LR}, is used to protect the
T parameter and the coupling of the left-handed bottom quark to the Z gauge
boson. In this article we emphasize that such a symmetry implies that the loop
corrections to both the T parameter and the Z b_L \bar{b}_L coupling are
calculable. In general, these corrections are correlated, can be sizable, and
should be considered to determine the allowed parameter space region in models
with warped extra dimensions and custodial symmetry, including Randall-Sundrum
models with a fundamental Higgs, models of gauge-Higgs unification and
Higgsless models. As an example, we derive the constraints that arise on a
representative model of gauge-Higgs unification from a global fit to the
precision electroweak observables. A scan over the parameter space typically
leads to a lower bound on the Kaluza-Klein excitations of the gauge bosons of
about 2-3 TeV, depending on the configuration. In the fermionic sector one can
have Kaluza-Klein excitations with masses of a few hundred GeV. We present the
constraints on these light fermions from recent Tevatron searches, and explore
interesting discovery channels at the LHC.


title:
Phenomenological studies of double charged pion electroproduction from
  the CLAS data

abstract:
  Recent results from phenomenological studies of the CLAS data on 2$\pi$
electroproduction off proton are presented. The analysis is focused on
extracting of N $\to$ $N^{*}$ electromagnetic transition amplitudes from the
full data set on unpolarized 1-differential 2$\pi$ cross-sections.


title: On the D-term of the nucleon generalized parton distributions

abstract:
  It is known that some of the deeply-virtual-Compton-scattering observables,
for instance, the beam-charge asymmetry in the hard electroproduction of real
photons on the nucleon, are extremely sensitive to the magnitude of D-term
appearing in the parameterization of the generalized parton distributions. We
report a theoretical analysis of both the isoscalar and isovector parts of the
nucleon D-term within the framework of the chiral quark soliton model, without
recourse to the derivative expansion type approximation used in previous works.


title: Reply to Takamatsu's paper on the Kappa

abstract:
  The essential elements in my way of fitting the kappa reviewed. A number of
incorrect claims made by Takamatsu are clarified and corrected.


title: Axion beams at HERA?

abstract:
  If the recently observed anomaly in the PVLAS experiment is due to the axion,
then the powerful beams of synchrotron photons, propagating through high
magnetic field of the HERA beamline, become strong axion sources. This gives a
unique opportunity of detection of the axion-photon interactions by installing
a small detector in the HERA tunnel, and to corroborate the axion hypothesis
within a few days of running.


title: Identifying the neutrino mass hierarchy with supernova neutrinos

abstract:
  We review how a high-statistics observation of the neutrino signal from a
future galactic core-collapse supernova (SN) may be used to discriminate
between different neutrino mixing scenarios. Most SN neutrinos are emitted in
the accretion and cooling phase, during which the flavor-dependent differences
of the emitted neutrino spectra are small and rather uncertain. Therefore the
discrimination between neutrino mixing scenarios using these neutrinos should
rely on observables independent of the SN neutrino spectra. We discuss two
complementary methods that allow for the positive identification of the mass
hierarchy without knowledge of the emitted neutrino fluxes, provided that the
13-mixing angle is large, $\sin^2\theta_{13}\gg 10^{-5}$. These two approaches
are the observation of modulations in the neutrino spectra by Earth matter
effects or by the passage of shock waves through the SN envelope. If the value
of the 13-mixing angle is unknown, using additionally the information encoded
in the prompt neutronization $\nu_e$ burst--a robust feature found in all
modern SN simulations--can be sufficient to fix both the neutrino hierarchy and
to decide whether $\theta_{13}$ is ``small'' or ``large.''


title: Baryon resonances in large N_c QCD

abstract:
  This thesis deals with the study of baryon spectra in the context of the
$1/N_c$ expansion. The standard tool to study baryon properties is the
constituent quark model. The results are naturally model dependent. The $1/N_c$
expansion generates a new perturbative approach to QCD, convenient for low
momentum transfer. It provides a new theoretical method that is quantitative,
systematic and predictive.
  In the first part of the thesis, the $1/N_c$ expansion is introduced as well
as the baryon structure at large $N_c$. A summary of important results for
ground-state baryons is provided.
  The second part of the thesis is devoted to excited baryon states. The
symmetric orbital states are treated by analogy to the ground state. For mixed
symmetric states, two approaches are presented. The traditional one starts from
the decoupling of the wave function into an excited quark and a symmetric core.
To make the problem tractable the wave function is treated approximately,
justified by a Hartree scheme. This approach is applied to the study of the
$[{\bf 70},\ell^+] (\ell=0,2)$ multiplets (nonstrange and strange cases) and of
the $[{\bf 56},4^+]$ multiplet. An important physical result is the dependence
of the spin dependent terms of the mass operator on the excitation energy.
  Recently we suggested a new approach based on a rigorous group theoretical
treatment of the matrix elements of SU(4). No decoupling and no approximations
are necessary. When applied to the $[{\bf 70},1^-]$ nonstrange multiplet, it is
found that the leading corrections to the mass operator are of order $1/N_c$
instead of $N_c^0$, as predicted by the decoupling procedure.


title:
Predictive model for dark matter, dark energy, neutrino masses and
  leptogenesis at the TeV scale

abstract:
  We propose a new mechanism of TeV scale leptogenesis where the chemical
potential of right-handed electron is passed on to the $B-L$ asymmetry of the
Universe in the presence of sphalerons. The model has the virtue that the
origin of neutrino masses are independent of the scale of leptogenesis. As a
result, the model could be extended to explain {\it dark matter, dark energy,
neutrino masses and leptogenesis at the TeV scale}. The most attractive feature
of this model is that it predicts a few hundred GeV triplet Higgs scalar that
can be tested at LHC or ILC.


title:
Right-chiral sneutrinos and long-lived staus: event characteristics at
  the Large Hadron Collider

abstract:
  We investigate the signals of a supersymmetric scenario where the lighter
tau-sneutrino is the lightest supersymmetric particle, while the lighter
stau-state is the next lightest. We confirm that such a scenario can be
motivated within the framework of minimal supergravity, with just the addition
of a right-chiral neutrino superfield. Such a spectrum leads to rather unusual
signals of supersymmetry, showing stable tracks of the stau in the muon
chambers. We have studied two types of signals, namely, (a) two or more hard
jets and two stau tracks, and (b) hard jets with two muons and two stau tracks.
We demonstrate that the stau tracks can be distinguished from the muonic ones
through proper kinematic cuts which also enable one to remove all standard
model backgrounds.


title:
Gauge Coupling Unification in the Exceptional Supersymmetric Standard
  Model

abstract:
  We consider the renormalisation group flow of gauge couplings within the
so-called exceptional supersymmetric standard model (E$_6$SSM) based on the low
energy matter content of 27 dimensional representations of the gauge group
$E_6$, together with two additional non-Higgs doublets. The two--loop beta
functions are computed, and the threshold corrections are studied in the
E$_6$SSM. Our results show that gauge coupling unification in the E$_6$SSM can
be achieved for phenomenologically acceptable values of $\alpha_3(M_Z)$,
consistent with the central measured low energy value, unlike in the minimal
supersymmetric standard model (MSSM) which, ignoring the effects of high energy
threshold corrections, requires significantly higher values of $\alpha_3(M_Z)$,
well above the experimentally measured central value.


title:
Vacuum Energy, EoS, and the Gluon Condensate at Finite Baryon Density in
  QCD

abstract:
  The Equation of States (EoS) plays the crucial role in all studies of neutron
star properties. Still, a microscopical understanding of EoS remains largely an
unresolved problem. We use 2-color QCD as a model to study the dependence of
vacuum energy (gluon condensate in QCD) as function of chemical potential
\mu\ll \Lambda_{QCD} where we find very strong and unexpected dependence on
$\mu$. We present the arguments suggesting that similar behavior may occur in
3-color QCD in the color superconducting phases. Such a study may be of
importance for analysis of EoS when phenomenologically relevant parameters
(within such models as MIT Bag model or NJL model) are fixed at zero density
while the region of study lies at much higher densities not available for
terrestrial tests.


title:
Conserving the lepton number $L_{e}-L_{\mu}-L_{\tau}$ in the exact
  solution of a 3-3-1 gauge model with right-handed neutrinos

abstract:
  In this paper we consider a plausible scenario with conserved lepton number
\textbf{$L=L_{e}-L_{\mu}-L_{\tau}$} within the framework of the exact solution
of a particular 3-3-1 gauge model. We discuss what are the consequences of
conserving this global leptonic symmetry from the viewpoint of the neutrino
mass matrix constructed via special Yukawa terms (involving tensor products
among Higgs triplets). We prove that the actual experimental data can naturally
be reproduced by our scenario since soft breaking terms with respect to this
lepton symmetry are properly introduced. As a consequence, our solution
predicts for the neutrino sector the correct mass splitting ratio ($\Delta
m_{12}^{2}/\Delta m_{23}^{2}\simeq0.033$), the inverted mass hierarchy, the
correct values for the observed mixing angles ($\sin^{2}\theta_{23}\simeq0.5$
and $\sin^{2}\theta_{12}=0.31$)and the absolute mass of the lightest neutrino
($m_{0}\sim0.001$eV)independent of the breakung scale of the model.


title: Baryon semileptonic decays: the Mexican contribution

abstract:
  We give a detailed account of the techniques to compute radiative corrections
in baryon semileptonic decays developed over the years by Mexican
collaborations. We explain how the method works by obtaining an expression for
the Dalitz plot of semileptonic decays of polarized baryons including radiative
corrections to order ${\mathcal O}(\alpha q/\pi M_1)$, where $q$ is the
four-momentum transfer and $M_1$ is the mass of the decaying baryon. From here
we compute the totally integrated spin angular asymmetry coefficient of the
emitted baryon and compare its value with other results.


title: Revising Limits on Neutrino-Majoron Couplings

abstract:
  Any theory that have a global spontaneously broken symmetry will imply the
existence of very light neutral bosons or massless bosons (sometimes called
Majorons). For most of these models we have neutrino-Majoron couplings, that
appear as additional branching ratios in decays of mesons and leptons. Here we
present an updated limits on the couplings between the electron, muon and tau
neutrinos and Majorons. For such we analyze the possible effects of Majoron
emission in both meson and lepton decays. In the latter we also include an
analysis of the muon decay spectrum. Our results are
  $|g_{e\alpha}|^{2}<5.5x10^{-6}$, $|g_{\mu\alpha}|^{2}<4.5x10^{-5}$ and
$|g_{\tau\alpha}|^{2}<5.5x10^{-2}$ at 90 % C. L., where $\alpha=e,\mu,\tau$.


title: Metastable SUSY breaking within the Standard Model

abstract:
  We construct a supersymmetric version of the Standard Model which contains a
long-lived metastable vacuum. In this vacuum supersymmetry is broken and the
electroweak symmetry is Higgsed, and we identify it with the physical ground
state of the Standard Model. In our approach the metastable supersymmetry
breaking (MSB) occurs directly in the SU(2)_L x U(1)_Y sector of the Standard
Model; it does not require a separate MSB sector and in this way it departs
from the usual lore. There is a direct link between the electroweak symmetry
breaking and the supersymmetry breaking in our model, both effects are induced
by the same Higgs fields. In order to generate sufficiently large gluino masses
we have to have strong coupling in the Higgs sector, h >> 1. Our model results
in an extremely compact low-energy effective theory at the electroweak scale
with Higgs fields being very heavy, M_{Higgs} >> M_W and frozen at their vacuum
expectation values.


title: Neutrinos; Opportunities and Strategies in the Future

abstract:
  I try to give an overview of future prospects of the experimental exploration
of the unknowns in the neutrino mass pattern and the lepton flavor mixing.
Because of the nature of the lectures on which this manuscript is based, I give
some pedagogical discussions to prepare for the presentation in the later part.
I start from measuring \theta_{13} by reactors and accelerators as a
prerequisite for proceeding to search for leptonic CP violation. I then discuss
how CP violation can be uncovered, and how the neutrino mass hierarchy can be
determined. I do these by resolving so called the ``parameter degeneracy''
which is necessary anyway if one wants to seek precision measurement of the
lepton mixing parameters. As a concrete setting for resolving the degeneracy I
introduce the Tokai-to-Kamioka-Korea two detector complex which receives
neutrino superbeam from J-PARC, sometimes dubbed as ``T2KK''. It is shown that
T2KK is able to resolve all the eight-fold parameter degeneracy in a wide range
of the lepton mixing parameters. I also discuss an alternative way for lifting
the \theta_{23} octant degeneracy by reactor-accelerator combined method.
Finally, I discuss by taking some examples how some theoretically or
phenomenologically motivated ideas can be tested experimentally.


title:
One-loop Radiative Corrections to the $\rho$ Parameter in the Left Right
  Twin Higgs Model

abstract:
  We implement a one-loop analysis of the $\rho$ parameter in the Left Right
Twin Higgs model, including the logarithmically enhanced contributions from
both heavy fermion and scalar loops. Numerical analysis indicates that the
one-loop corrections are dominant over the tree-level contributions in most
regions of parameter space. The experimentally allowed values of the
$\rho$-parameter divide the allowed parameter space into two regions; less than
$670 {\rm GeV}$ and larger than $1100 {\rm GeV}$ roughly, for the symmetry
breaking scale $f$. Therefore our result significantly reduces the parameter
space which are favorably accessible to the LHC.


title:
Exclusive $B \to PV $ Decays and CP Violation in the General
  two-Higgs-doublet Model

abstract:
  We calculate all the branching ratios and direct CP violations of $B \to PV$
decays in a most general two-Higgs-doublet model with spontaneous CP violation.
As the model has rich CP-violating sources, it is shown that the new physics
effects to direct CP violations and branching ratios in some channels can be
significant when adopting the generalized factorization approach to evaluate
the hadronic matrix elements, which provides good signals for probing new
physics beyond the SM in the future B experiments.


title:
Dispersion total photoproduction sum rules for nucleons and few-body
  nuclei revisited

abstract:
  The questions on the presense and quantitative role of the constant terms in
the real part of the high-energy photon-nucleon and photon-nucleus amplitudes
representing the contribution of the non-Regge (the fixed j=0-pole)
singularities in the finite-energy sum rules (FESR) for the photoabsorption
cross sections on nucleons and the lightest atomic nuclei are discussed and new
testable relations are presented for relevant combinations of the Compton
scattering amplitudes.


title: Correlations and fluctuations: generalized factorial moments

abstract:
  A systematic study of the relations between fluctuations of the extensive
multiparticle variables and integrals of the inclusive multipaticle densities
is analysed. The generalized factorial moments are introduced and their
physical meaning discussed. The effects of the additive conservation laws are
analysed.


title: The dipole form of the quark part of the BFKL kernel

abstract:
  The dipole form of the ``Abelian'' part of the massless quark contribution to
the BFKL kernel is found in the coordinate representation by direct transfer
from the momentum representation where the contribution was calculated before.
It coincides with the corresponding part of the quark contribution to the
dipole kernel calculated recently by Balitsky and is conformal invariant.


title:
Azimuthal Asymmetries in DIS as a Probe of Intrinsic Charm Content of
  the Proton

abstract:
  We calculate the azimuthal dependence of the heavy-quark-initiated ${\cal
O}(\alpha_{s})$ contributions to the lepton-nucleon deep inelastic scattering
(DIS). It is shown that, contrary to the photon-gluon fusion (GF) component,
the photon-quark scattering (QS) mechanism is practically
$\cos2\phi$-independent. We investigate the possibility to discriminate
experimentally between the GF and QS contributions using their strongly
different azimuthal distributions. Our analysis shows that the GF and QS
predictions for the azimuthal $\cos2\phi$ asymmetry are quantitatively well
defined in the fixed flavor number scheme: they are stable, both parametrically
and perturbatively. We conclude that measurements of the azimuthal
distributions at large Bjorken $x$ could directly probe the intrinsic charm
content of the proton. As to the variable flavor number schemes, the charm
densities of the recent CTEQ and MRST sets of parton distributions have a
dramatic impact on the $\cos2\phi$ asymmetry in the whole region of $x$ and,
for this reason, can easily be measured.


title:
Axial anomaly and the precise value of the $\pi^0 \to 2 \gamma$ decay
  width

abstract:
  The anomaly in the vacuum expectation value of the product of axial and two
vector currents (AVV) in QCD is investigated. The goal is to determine from its
value the $\pi^0 \to 2 \gamma$ decay width with high precision. The sum rule
for AVV formfactor is studied. The difference $f_{\pi^0} - f_{\pi^+}$ caused by
strong interaction is calculated and appears to be small. The $\pi^0 - \eta$
mixing is accounted. The $\pi^0 \to 2 \gamma$ decay width determined
theoretically from the axial anomaly is found to be $\Gamma(\pi^0 \to 2 \gamma)
= 7.93 eV$ with an error $\sim 1.5%$. The measurement of the $\pi^0 \to 2
\gamma$ decay width at the same level of accuracy would allow one to achieve a
high precision test of QCD.


title:
Effect of H^\pm on B^\pm\to \tau^\pm\nu_\tau and D^\pm_s\to
  \mu^\pm\nu_\mu,\tau^\pm\nu_\tau

abstract:
  The recent observation of the purely leptonic decay B^\pm\to \tau^\pm\nu_\tau
at the B factories permits a sizeable contribution from a charged Higgs boson
(H^\pm). Such a H^\pm would also contribute to the decays D^\pm_s\to
\mu^\pm\nu_\mu and D^\pm_s\to \tau^\pm\nu_\tau, which are being measured with
increasing precision at CLEO-c. We show that the branching ratios of D^\pm_s\to
\mu^\pm\nu_\mu and D^\pm_s\to \tau^\pm\nu_\tau could be suppressed by up to 10%
from the Standard Model prediction, which is larger than the anticipated
precision in the measurements of these decays at forthcoming BES-III.


title:
Aspects of matter-antimatter asymmetries in relativistic heavy ions
  collisions and Astroparticle Physics

abstract:
  Matter-antimatter asymmetries observed in high energy / relativistic heavy
ion collisions and, differently, in the Early Universe are discussed
considering ideas from the phase diagram of strong interactions with
assumptions that do not necessarilly rely on non-equilibrium conditions, and
that are based in effects such as spontaneous symmetry breaking.


title:
Higher-order soft gluon corrections in single top quark production at
  the LHC

abstract:
  I present a calculation of soft-gluon corrections to single top quark
production in pp collisions at the LHC via the Standard Model partonic
processes in the t and s channels and associated top quark and W boson
production. Higher-order soft-gluon corrections through
next-to-next-to-next-to-leading order (NNNLO) are calculated at next-to-leading
logarithmic (NLL) accuracy. The soft-gluon corrections in the s channel and in
tW production are large and dominant, while in the t channel they are not a
good approximation of the complete QCD corrections.


title: Restoration of chiral and $U(1)_A$ symmetries in excited hadrons

abstract:
  The effective restoration of $SU(2)_L \times SU(2)_R$ and $U(1)_A$ chiral
symmetries of QCD in excited hadrons is reviewed. While the low-lying hadron
spectrum is mostly shaped by the spontaneous breaking of chiral symmetry, in
the high-lying hadrons the role of the quark condensate of the vacuum becomes
negligible and the chiral symmetry is effectively restored. This implies that
the mass generation mechanisms in the low- and high-lying hadrons are
essentially different. The fundamental origin of this phenomenon is a
suppression of quark quantum loop effects in high-lying hadrons relative to the
classical contributions that preserve both chiral and $U(1)_A$ symmetries.
Microscopically the chiral symmetry breaking is induced by the dynamical
Lorentz-scalar mass of quarks due to their coupling with the quark condensate
of the vacuum. This mass is strongly momentum-dependent, however, and vanishes
in the high-lying hadrons where the typical momentum of valence quarks is
large. This physics is illustrated within the solvable chirally-symmetric and
confining model. Effective Lagrangians for the approximate chiral multiplets at
the hadron level are constructed which can be used as phenomenological
effective field theories in the effective chiral restoration regime. Different
ramifications and implications of the effective chiral restoration for the
string description of excited hadrons, the decoupling of excited hadrons from
the Goldstone bosons, the glueball - quark-antiquark mixing and the OZI rule
violations are discussed.


title: Chiral extrapolation of nucleon magnetic form factors

abstract:
  The extrapolation of nucleon magnetic form factors calculated within lattice
QCD is investigated within a framework based upon heavy baryon chiral
effective-field theory. All one-loop graphs are considered at arbitrary
momentum transfer and all octet and decuplet baryons are included in the
intermediate states. Finite range regularisation is applied to improve the
convergence in the quark-mass expansion. At each value of the momentum transfer
($Q^2$), a separate extrapolation to the physical pion mass is carried out as a
function of $m_\pi$ alone. Because of the large values of $Q^2$ involved, the
role of the pion form factor in the standard pion-loop integrals is also
investigated. The resulting values of the form factors at the physical pion
mass are compared with experimental data as a function of $Q^2$ and demonstrate
the utility and accuracy of the chiral extrapolation methods presented herein.


title:
Examining the Geometrical Model with Inverted Mass Hierarchy for
  Neutrinos

abstract:
  The comprehensive analyses are presented in the model with the inverted mass
hierarchy for neutrinos, which follows from a geometrical structure of a (1+5)
dimensional space-time where two extra dimensions are compactified on the
T^2/Z_3 orbifold. The model gives two large lepton flavor mixings due to the S3
structure in the (1+5) dimensional space-time. It also predicts the lightest
neutrino mass as m_3=(1-50)\times 10^{-5}eV and the effective neutrino mass
responsible for neutrinoless double beta decays as <m>_{ee}\simeq 50 meV. The
low energy CP violation, J_{CP} could be 0.02. On the other hand, the observed
baryon asymmetry in the present universe is produced by the non-thermal
leptogenesis, which works even at the reheating temperature
TR=10^{4}-10^{6}GeV. The correlation between the baryon asymmetry and the low
energy CP violation is examined in this model.


title: An N-tropic Solution to the Cosmological Constant Problem

abstract:
  Based on the assertion that the cosmological constant problem is essentially
a quantum gravity problem, the framework which addresses the cosmological
constant problem should also bear a picture for the ``quantum space-time''. In
this talk in an attempt to address the cosmological constant problem I suggest
to start with noncommutative fuzzy spheres as the toy model for the quantum
space-time. In this setting, we show that the cosmological constant problem may
be resolved due to the noncommutativity and ``fuzziness'' of the space and the
fact that the smallest volume which could be measured in the a quantum
space-time is much larger than the naively expected Planckian size. This talk
is based on Ref.[1] which has appeared on the arXiv as hep-th/0605110.


title:
Light-cone sum rules for the $N\gamma\Delta$ transitions for real
  photons

abstract:
  We examine the radiative $\Delta \to \gamma N$ transition at the real photon
point $Q^2=0$ using the framework of light-cone QCD sum rules. In particular,
the sum rules for the transition form factors $G_M(0)$ and $R_{EM}$ are
determined up to twist 4. The result for $G_M(0)$ agrees with experiment within
10% accuracy. The agreement for $R_{EM}$ is also reasonable. In addition, we
derive new light-cone sum rules for the magnetic moments of nucleons, with a
complete account of twist-4 corrections based on a recent reanalysis of photon
distribution amplitudes.


title: QCD effective action with a most general homogeneous field background

abstract:
  We consider one-loop effective action of SU(3) QCD with a most general
constant chromomagnetic (chromoelectric) background which has two independent
Abelian field components. The effective potential with a pure magnetic
background has a local minimum only when two Abelian components H_{\mu\nu}^3
and H_{\mu\nu}^8 of color magnetic field are orthogonal to each other. The
non-trivial structure of the effective action has important implication in
estimating quark-gluon production rate and p_T-distribution in quark-gluon
plasma. In general the production rate depends on three independent Casimir
invariants, in particular, it depends on the relative orientation between
chromoelectric fields.


title: Exploring the charged Higgs bosons in the lef-right symmetric model

abstract:
  We explore constraints on the charged Higgs sector in the left-right (LR)
model from the present experimental data. Due to the different Yukawa
structure, the allowed parameter space of the charged Higgs boson in the LR
model is different from that in the two Higgs doublet model. We find that the
constraint from $t \to b H^\pm$ decay at Tevatron is most significant, while $B
\to \tau \nu$ decay could provide no constraint on the LR model. Bounds from
$e^- e^+ \to H^- H^+$ process at LEP are similar to that in the two Higgs
doublet model.


title: A supersymmetric 3-4-1 model

abstract:
  We build the complete supersymmetric version of a 3-4-1 gauge model using the
superfield formalism. We point out that a discrete symmetry, similar to the
R-symmetry in the minimal supersymmetric standard model, is possible to be
defined in this model. Hence we have both R-conserving and R-violating
possibilities. We also discuss some phenomenological results coming from this
model.


title: Towards understanding broad degeneracy in non-strange mesons

abstract:
  The spectroscopic regularities of modern empirical data on the non-strange
mesons up to 2.4 GeV can be summarized as a systematic clustering of states
near certain values of energy. It is getting evident that some unknown
X-symmetry triggers the phenomenon. We review the experimental status of this
symmetry and recent theoretical attempts put forward for explanation of broad
degeneracy.


title:
Dynamical chiral symmetry breaking by a magnetic field and multi-quark
  interactions

abstract:
  Catalysis of dynamical symmetry breaking by a constant magnetic field in
(3+1) dimensions is considered. We use the three flavour Nambu -- Jona-Lasinio
type model with 't Hooft and eight-quark interaction terms. It is shown that
the multi-quark interactions introduce new additional features to this
phenomenon: (a) the local minimum of the effective potential catalyzed by the
constant magnetic field is smoothed out with increasing strength of the field
at the characteristic scale H~10^{19} G, (b) the multi-quark forces generate
independently another local minimum associated with a larger dynamical fermion
mass. This state may exist even for multi-quark interactions with a subcritical
set of couplings, and is globally stable with respect to a further increase of
the magnetic field.


title: Quark number susceptibilities: lattice QCD versus PNJL model

abstract:
  Quark number susceptibilities at finite quark chemical potential are
investigated in the framework of the Polyakov-loop-extended Nambu Jona-Lasinio
(PNJL) model. A detailed comparison is performed between the available lattice
data, extrapolated using a Taylor expansion around vanishing chemical
potential, and PNJL results consistently obtained from a Taylor series
truncated at the same order. The validity of the Taylor expansion is then
examined through a comparison between the full and truncated PNJL model
calculations.


title: Fermion mass and the pressure of dense matter

abstract:
  We consider a simple toy model to study the effects of finite fermion masses
on the pressure of cold and dense matter, with possible applications in the
physics of condensates in the core of neutron stars and color
superconductivity.


title: Testing Grand Unification at the (S)LHC

abstract:
  We examine the possibility of measuring the three gauge couplings at high
scales at the LHC, in order to see the first steps as they run toward Grand
Unification at much higher energies. Using the MSSM with sparticle masses of
several hundred GeV as an example of a theory in which the couplings do unify
at very high energies, we find that the processes pp->lv, pp->l+l- and
pp->gamma+j can be useful to discriminate the SM from the MSSM with masses at
the few hundred GeV scale, and determine that the couplings are converging at
better than the SM prediction toward the GUT scale. Such measurements
indirectly probe the existence of lower mass states, charged under the SM gauge
groups, but which may be difficult to produce directly or extract from
backgrounds at the LHC.


title:
The production of the new gauge boson $B_{H}$ via $e^{-}\gamma$
  collision in the littlest Higgs model

abstract:
  The new lightest gauge boson $B_H$ with mass of a few hundred GeV is
predicted in the littlest Higgs model. $B_H$ should be accessible in the planed
ILC and the observation of such particle can strongly support the littlest
Higgs model. The realization of $\gamma\gamma$ and $e\gamma$ collision will
open a wider window to probe $B_H$. In this paper, we study the new gauge boson
$B_{H}$ production processes $e^{-}\gamma\to e^{-}\gamma B_{H}$ and
$e^{-}\gamma\to e^{-}Z B_{H}$ at the ILC. Our results show that the production
cross section of the process $e^{-}\gamma\to e^{-}Z B_{H}$ is less than one fb
in the most parameter spaces while the production cross section of the process
$e^{-}\gamma\to e^{-}\gamma B_{H}$ can reach the level of tens fb and even
hundreds of fb in the sizable parameter spaces allowed by the electroweak
precision data. With the high luminosity, the sufficient typical signals could
be produced, specially via $e^{-}\gamma\to e^{-}\gamma B_{H}$. Because the
final electron and photon beams can be easily identified and the signal can be
easily distinguished from the background produced by $Z$ and $H$ decaying,
$B_H$ should be detectable via $e\gamma$ collision at the ILC. Therefore, the
processes $e^{-}\gamma\to e^{-}\gamma B_{H}$ and $e^{-}\gamma\to e^{-}Z B_{H}$
provide a useful way to detect $B_{H}$ and test the littlest Higgs model.


title: Scalar field phase dynamics in preheating

abstract:
  We study the model of a massive inflaton field $\phi$ coupled to another
scalar filed $\chi$ with interaction term $g^2\phi^2\chi^2$ for the first stage
of preheating. We obtain the the behavior of the phase in terms of the
iteration of a simple family of circle maps. When expansion of the universe is
taken into account the qualitative behavior of the phase and growth number
evolution is reminiscent of the behavior found in the case without expansion.


title: Meson-Baryon Effective Chiral Lagrangians at O(q^3) Revisited

abstract:
  After our work was published, Frink and Mei{\ss}ner \cite{FM06} pointed out
that our {\cal O}(q^3) three-flavour meson-baryon chiral Lagrangian was not
minimal. Here, we discuss their findings and revise ours accordingly. We find
that eight monomials in our ${\cal O}(q^3)$ Lagrangian are not independent, but
in addition, two monomials were wrongly discarded, which, as a result, makes
the agreement in the number of independent monomials with \cite{FM06} complete.


title: Angular hadron correlations probing the early medium evolution

abstract:
  Hard processes are a well calibrated probe to study heavy-ion collisions.
However, the information to be gained from the nuclear suppression factor R_AA
is limited, hene one has to study more differential observables to do medium
tomography. The angular correlations of hadrons associated with a hard trigger
appear suitable as they show a rich pattern when going from low p_T to high
p_T. Of prime interest is the fate of away side partons with an in-medium
pathlength O(several fm). At high p_T the correlations become dominated by the
punchtrough of the away side parton with subsequent fragmentation. We discuss
what information about the medium density can be gained from the data.


title: Chromomagnetic Dipole Moment of the Top Quark Revisited

abstract:
  We study the complete one-loop contributions to the chromagnetic dipole
moment $\Delta\kappa$ of the top quark in the Standard Model, two Higgs doublet
models, topcolor assited technicolor models (TC2), 331 models and extended
models with a single extra dimension. We find that the SM predicts
$\Delta\kappa = - 0.056$ and that the predictions of the other models are also
consitent with the constraints imposed on $\Delta\kappa$ by low-energy
precision measurements.


title:
Multiple-Isotope Comparison for Determining Neutrinoless Double-Beta
  Decay Mechanisms

abstract:
  We present a technique for estimating the number of future neutrinoless
double-beta decay results using several distinct nuclei to optimize the physics
reach of upcoming experiments. We use presently available matrix element
calculations and simulated sets of predicted neutrinoless double-beta decay
measured rates in multiple isotopes to estimate the required precision and
number of experiments to discern the underlying physics governing the mechanism
of the process. Our results indicate that 3 (4) experimental results with total
uncertainty (statistical, systematic, theoretical) of less than ~20% (~40%) can
elucidate the underlying physics. If the theoretical (i.e. matrix element)
uncertainty contribution is below ~18%, then 3-4 experimental results of ~20%
precision (statistical and systematic) are required. These uncertainty goals
can be taken as guidance for the upcoming theoretical and experimental
programs.


title:
Isospin Chemical potential and temperature effects in the Linear Sigma
  Model

abstract:
  In this letter we explore the temperature and isospin chemical potential
($\mu_I$) dependence of the vacuum structure and the meson masses in the linear
sigma model, at the one loop level. The sigma meson mass grows steadily with
temperature. This behavior does not agree with previous mean field
calculations. For the pion our results show the same behavior as the mean field
approach. The stability of the vacuum has a very soft dependence on $\mu_I$
since this is a second order effect in the tadpole diagrams.


title:
Nucleon Decay Searches with large Liquid Argon TPC Detectors at Shallow
  Depths: atmospheric neutrinos and cosmogenic backgrounds

abstract:
  Grand Unification of the strong, weak and electromagnetic interactions into a
single unified gauge group is an extremely appealing idea which has been
vigorously pursued theoretically and experimentally for many years. The
detection of proton or bound-neutron decays would represent its most direct
experimental evidence. In this context, we studied the physics potentialities
of very large underground Liquid Argon Time Projection Chambers (LAr TPC). We
carried out a detailed simulation of signal efficiency and background sources,
including atmospheric neutrinos and cosmogenic backgrounds. We point out that a
liquid Argon TPC, offering good granularity and energy resolution, low particle
detection threshold, and excellent background discrimination, should yield very
good signal over background ratios in many possible decay modes, allowing to
reach partial lifetime sensitivities in the range of $10^{34}-10^{35}$ years
with exposures up to 1000 kton$\times$year, often in quasi-background-free
conditions optimal for discoveries at the few events level, corresponding to
atmospheric neutrino background rejections of the order of $10^5$. Multi-prong
decay modes like e.g. $p\to \mu^- \pi^+ K^+$ or $p\to e^+\pi^+\pi^-$ and
channels involving kaons like e.g. $p\to K^+\bar\nu$, $p\to e^+K^0$ and $p\to
\mu^+K^0$ are particularly suitable, since liquid Argon imaging (...)


title:
Connecting an effective model of confinement and chiral symmetry to
  lattice QCD

abstract:
  We construct an effective model for the chiral field and the Polyakov loop in
which we can investigate the interplay between the approximate chiral symmetry
restoration and the deconfinement of color in a thermal SU(3) gauge theory with
three flavors of massive quarks. The phenomenological couplings between these
two sectors can then be related to the recent lattice data on the renormalized
Polyakov loop and the chiral condensate close to the critical region.


title:
Baryogenesis via left-right asymmetry generation by Affleck-Dine
  mechanism in Dirac neutrino model

abstract:
  A baryogenesis scenario in supersymmetric standard models with Dirac
neutrinos proposed by Abel and Page is reconsidered with introducing
intermediate scale physics to stabilize the runaway potential along a
right-handed sneutrino direction. In contrary with previous results, the baryon
number asymmetry can be explained even for higher reheating temperature without
entropy production if the lightest neutrino mass is small and/or thermal
effects induce early oscillation. We discuss the solution to the problem of
dark matter overproduction by the right-handed sneutrino decay by SU(2)_R gauge
interaction.


title: Thermal production of gravitinos

abstract:
  We reconsider thermal production of gravitinos in the early universe, adding
to previously considered 2 -> 2 gauge scatterings: a) production via 1 -> 2
decays, allowed by thermal masses; b) the effect of the top Yukawa coupling; c)
a proper treatment of the reheating process. Our final result behaves
physically (larger couplings give a larger rate) and is twice larger than
previous results, implying e.g. a twice stronger constraint on the reheating
temperature. Accessory results about (supersymmetric) theories at finite
temperature and gravitino couplings might have some interest.


title:
Next-to-leading order QCD corrections to W+Z and W-Z production via
  vector-boson fusion

abstract:
  We present the calculation of the next-to-leading order QCD corrections to
electroweak p p -> e+ nu_e mu+ mu- jj and p p -> e- nubar_e mu+ mu- jj
production at the CERN LHC in the form of a fully flexible parton-level Monte
Carlo program. The QCD corrections to the total cross sections are modest,
changing the leading-order results by less than 10%. At the Born level, the
shape of kinematic distributions can depend significantly on the choice of
factorization scale. This theoretical uncertainty is strongly reduced by the
inclusion of the next-to-leading order QCD corrections.


title: Tracing CP-violation in Lepton Flavor Violating Muon Decays

abstract:
  Although the Lepton Flavor Violating (LFV) decay $\mu^+\to e^+ \gamma$ is
forbidden in the Standard Model (SM), it can take place within various theories
beyond the SM. If the branching ratio of this decay saturates its present bound
[{\it i.e.,} Br$(\mu^+ \to e^+\gamma)\sim 10^{-11}$], the forthcoming
experiments can measure the branching ratio with high precision and
consequently yield information on the sources of LFV. In this letter, we show
that for polarized $\mu^+$, by studying the angular distribution of the
transversely polarized positron and linearly polarized photon we can derive
information on the CP-violating sources beyond those in the SM. We also study
the angular distribution of the final particles in the decay $\mu^+\to e^+_1
e^- e^+_2$ where $e^+_1$ is defined to be the more energetic positron. We show
that transversely polarized $e_1^+$ can provide information on a certain
combination of the CP-violating phases of the underlying theory which would be
lost by averaging over the spin of $e^+_1$.


title: Hidden fermion as milli-charged dark matter in Stueckelberg Z' model

abstract:
  We augment the hidden Stueckelberg $Z'$ model by a pair of Dirac fermions in
the hidden sector, in which the $Z'$ has a coupling strength comparable to weak
scale coupling. We show that this hidden fermion-antifermion pair could be a
milli-charged dark matter candidate with a viable relic density. Existing
terrestrial and astrophysical searches on milli-charged particles do not place
severe constraints on this hidden fermion. We calculate the flux of
monochromatic photons coming from the Galactic center due to pair annihilation
of these milli-charged particles and show that it is within reach of the next
generation $\gamma$-ray experiments. The characteristic signature of this
theoretical endeavor is that the Stueckelberg $Z'$ boson has a large invisible
width decaying into the hidden fermion-antifermion pair. We show that existing
Drell-Yan data do not constrain this model yet. Various channels of singly
production of this $Z'$ boson at the LHC and ILC are explored.


title: Semileptonic decays of pseudoscalar mesons to scalar "f_0" meson

abstract:
  The transition form factors of (D_s -> f_0 l nu), (D -> f_0 l nu) and (B_u ->
f_0 l nu) decays are calculated in 3-point QCD sum rule method, assuming that
"f_0" is a quark-antiquark state with a mixture of strange and light quarks.
The branching ratios of these decays are calculated in terms of the mixing
angle.


title:
Low Intermediate Scales for Leptogenesis in Supersymmetric SO(10) Grand
  Unified Theories

abstract:
  A low intermediate scale within minimal supersymmetric SO(10) GUTs is a
desirable feature to accommodate leptogenesis. We explore this possibility in
models where the intermediate gauge symmetry breaks spontaneously by (a)
doublet Higgs scalars and also (b) by triplets. In both scenarios gauge
coupling unification requires the scale of left-right symmetry breaking ($M_R$)
to be close to the unification scale. This will entail unnaturally small
neutrino Yukawa couplings to avoid the gravitino problem and allow successful
leptogenesis. We point out that any one of three options -- threshold
corrections due to the mass spectrum near the unification scale, gravity
induced non-renormalizable operators near the Planck scale, or presence of
additional light Higgs multiplets -- can permit unification along with much
lower values of $M_R$ as required for leptogenesis. In the triplet model,
independent of these corrections, we find a lower bound on the intermediate
scale,
  $M_R > 10^9$ GeV, arising from the requirement that the theory must remain
perturbative at least upto the GUT scale. We show that in the doublet model
$M_R$ can even be in the TeV region which, apart from permitting resonant
leptogenesis, can be tested at LHC and ILC.


title: Goldstone bosons in presence of charge density

abstract:
  We investigate spontaneous symmetry breaking in Lorentz-noninvariant
theories. Our general discussion includes relativistic systems at finite
density as well as intrinsically nonrelativistic systems. The main result of
the paper is a direct proof that nonzero density of a non-Abelian charge in the
ground state implies the existence of a Goldstone boson with nonlinear
(typically, quadratic) dispersion law. We show that the Goldstone boson
dispersion relation may in general be extracted from the current transition
amplitude and demonstrate on examples from recent literature, how the
calculation of the dispersion relation is utilized by this method. After then,
we use the general results to analyze the nonrelativistic degenerate Fermi gas
of four fermion species. Due to its internal SU(4) symmetry, this system
provides an analog to relativistic two-color quantum chromodynamics with two
quark flavors. In the end, we extend our results to pseudo-Goldstone bosons of
an explicitly broken symmetry.


title: Spectral-fluctuations test of the quark-model baryon spectrum

abstract:
  We study the low-lying baryon spectrum (up to 2.2 GeV) provided by
experiments and different quark models using statistical tools which allow to
postulate the existence of missing levels in spectra. We confirm that the
experimental spectrum is compatible with Random Matrix Theory --the
paradigmatic model of quantum chaos--, and we find that the quark models are
more similar to a Poisson distribution, which is not compatible with what
should be expected in a correlated spectrum. From our analysis it stems that
the spectral fluctuation properties of quark-model spectra are incompatible
with experimental data. This result can be used to enlighten the problem of
missing resonances.


title:
Scaling behaviour of exclusive reactions with the deuteron and 3He at
  high p_T in the Gev region

abstract:
  The scaling behaviour s^{-11} of the cross section of the reaction \gamma d->
pn observed at SLAC and Jlab at energies E_{\gamma}=1-4 GeV and large p_T most
likely displays quark degrees of freedom in the deuteron. We show that the
cross sections of the dd->3Hp and pd-> 3Hen reactions measured at SATURNE
follow the scaling regime s{-22} at T_d= 0.5 -1.2 GeV and
$\theta_{cm}=50^\circ-60^\circ$. A necessity to get new data on this and other
exclusive reactions is argued.


title:
Self-consistent evaluation of quark masses in three flavor crystalline
  color superconductivity

abstract:
  We present a self-consistent evaluation of the constituent quark masses in
the three flavor Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) phases of QCD,
employing an improved Nambu-Jona Lasinio model. This result allows to determine
the window for values of the baryonic chemical potential where the LOFF state
is energetically favored.


title:
Constraints on the IR behaviour of gluon and ghost propagator from
  Ward-Slavnov-Taylor identities

abstract:
  We consider the constraints of the Slavnov-Taylor identity of the IR
behaviour of gluon and ghost propagators and their compatibility with solutions
of the ghost Dyson-Schwinger equation and with the lattice picture.


title: Baryon kinetic energy loss in the color flux tube model

abstract:
  This article generalizes Schwinger's mechanism for particles production in
the arbitrary finite field volume. McLerran-Venugopolan(MV) model and iterative
solution of DGLAP equation in the double leading log approximation for small x
gluon distribution function were used to derive the new formula for initial
chromofield energy density. This initial chromofield energy is distributed
among color neutral clusters or strings of different length. This strings are
stretched by receding nucleus. From the proposed mechanism of string
fragmentation or color field decay based on exact solution of Dirac equation in
the different finite volume, the new formulae for esimated baryon kinetic
energy loss and rapidity spectrum of produced partons were derived.


title: Merging Flavour Symmetries with QCD Factorisation for B-->KK Decays

abstract:
  The interplay between flavour symmetries connecting Bs-->KK decays with the
recently measured Bd--> K0 anti-K0 decay and QCD Factorisation opens new
strategies to describe the decays Bs--> K0 anti-K0 and Bs--> K+ K- in the SM
and in supersymmetry. A new relation, emerging from the sum-rule for the Bs-->
K0 anti-K0 decay mode, is presented offering a new way to determine the weak
mixing angle phi_s of the Bs system.


title: Potential model calculations and predictions for heavy quarkonium

abstract:
  We investigate the spectroscopy and decays of the charmonium and upsilon
systems in a potential model consisting of a relativistic kinetic energy term,
a linear confining term including its scalar and vector relativistic
corrections and the complete perturbative one-loop quantum chromodynamic short
distance potential. The masses and wave functions of the various states are
obtained using a variational technique, which allows us to compare the results
for both perturbative and nonperturbative treatments of the potential. As well
as comparing the mass spectra, radiative widths and leptonic widths with the
available data, we include a discussion of the errors on the parameters
contained in the potential, the effect of mixing on the leptonic widths, the
Lorentz nature of the confining potential and the possible $c\bar{c}$
interpretation of recently discovered charmonium-like states.


title:
Measuring the angle $\gamma$ of the unitarity triangle in $B_s$ decays
  into CP eigenstates

abstract:
  In this paper penguin contribution has not been included, so it is not
suitable to be published.


title: Pair creation by a photon in a strong magnetic field

abstract:
  The process of pair creation by a photon in a strong magnetic field is
investigated basing on the polarization operator in the field. The total
probability of the process is found in a relatively simple form. The
probability exhibits a "saw-tooth" pattern because of divergences arising when
the electron and positron are created at threshold of the Landau energy levels.
The pattern will be washed out at averaging over any smooth photon energy
distribution. The new results are obtained in the scope of the quasiclassical
approach: 1) in the case when the magnetic field $B \ll B_0, (B_0$ is the
critical field) the new formulation extends the photon energy interval to the
case when the created particles are not ultrarelativistic; 2) the correction to
the standard quasiclassical approximation is found showing the range of
applicability of the approach at high photon energy as well. The very important
conclusion is that for both cases $B \ll B_0$ and $B \geq B_0$ the results of
the quasiclassical calculation are very close to averaged probabilities of
exact theory in a very wide range of photon energies. The quasiclassical
approximation is valid also for the energy distribution if the electron and
positron are created on enough high levels.


title:
Excited ${\bf (70,1^-)}$ baryon resonances in the relativistic quark
  model

abstract:
  The relativistic three-quark equations of the ${\bf (70,1^-)}$ baryons are
found in the framework of the dispersion relation technique. The approximate
solutions of these equations using the method based on the extraction of
leading singularities of the amplitude are obtained. The calculated mass values
of the ${\bf (70,1^-)}$ multiplet are in good agreement with the experimental
ones.


title: Nonlinearity of Regge trajectories in the scattering region

abstract:
  The nonlinearity of Regge trajectories at real negative values of the
argument is discussed as their general QCD-inspired property. The processes of
elastic diffractive scattering $p+p\to p+p$ and $\bar p+p\to\bar p+p$ at
collision energies $\sqrt{s}>23 GeV$ and transferred momenta squared $0.005
GeV^2<-t<3 GeV^2$ are considered in the framework of the Regge-eikonal model
\cite{arnold}. By comparison of phenomenological estimates with available
experimental data on angular distributions it is demonstrated that in this
kinematical range the data can be satisfactorily described as if taking into
account only three nonlinear Regge trajectories with vacuum quantum numbers
(``soft'' pomeron, C-even $f_2/a_2$-reggeon and $C$-odd $\omega/\rho$-reggeon).
It is also shown that their nonlinearity is essential and not to be ignored.
The correspondence of the Kwiecinski $q\bar q$-pole \cite{kwiecinski} to the
secondary reggeons and the relevance of the Kirschner-Lipatov ``hard'' pomeron
pole \cite{kirschner} to elastic diffraction are discussed.


title: The pomeron intercept in gluodynamics

abstract:
  This paper has been withdrawn by the author because the main result is
gauge-dependent.


title: Aspects of quark mass generation on a torus

abstract:
  In this talk we report on recent results for the quark propagator on a
compact manifold. The corresponding Dyson-Schwinger equations on a torus are
solved on volumes similar to the ones used in lattice calculations. The
quark-gluon interaction is fixed such that the lattice results are reproduced.
We discuss both the effects in the infinite volume/continuum limit as well as
effects when the volume is small.


title:
Search for the neutron EDM and time reversal symmetry violation in
  noncentrosymmetric crystals

abstract:
  CP-violating spin rotation and spin dichroism in noncentrosymmetric crystals
is discussed.


title: Hard exclusive electroproduction of a pion in the backward region

abstract:
  We study the scaling regime of pion electroproduction in the backward region,
eN->e'N'pi. We compute the leading-twist amplitude in the kinematical region,
where it factorises into a short-distance matrix element and long-distance
dominated nucleon Distribution Amplitudes and nucleon to pion Transition
Distribution Amplitudes. Using the chiral limit of the latter, we obtain a
first estimate of the cross section, which may be experimentally studied at
JLab or Hermes.


title:
Left-Right squarks mixings effects in Charged Higgs Bosons decays $H^\pm
  \to W^\pm (\gamma, Z)$ in the MSSM

abstract:
  We study the complete one loop contribution to $H^\pm\to W^\pm V$, $V= Z,
\gamma$, in the Minimal Supersymmetric Standard Model (MSSM). We evaluate the
MSSM contributions taking into account $B\to X_s\gamma$ constraint as well as
experimental constraints on the MSSM parameters. In the MSSM, we found that in
the intermediate range of $\tan\beta \la 10$ and for large $A_t$ and large
$\mu$, where lightest stop becomes very light and hence squarks contribution is
not decoupling, the branching ratio of $H^\pm \to W^{\pm} Z$ can be of the
order $10^{-3}$ while the branching ratio of $H^\pm \to W^{\pm} \gamma$ is of
the order $10^{-5}$. We also study the effects of the CP violating phases of
Soft SUSY parameters and found that they can modify the branching ratio by
about one order of magnitude.


title:
Neural network determination of parton distributions: the nonsinglet
  case

abstract:
  We provide a determination of the isotriplet quark distribution from
available deep--inelastic data using neural networks. We give a general
introduction to the neural network approach to parton distributions, which
provides a solution to the problem of constructing a faithful and unbiased
probability distribution of parton densities based on available experimental
information. We discuss in detail the techniques which are necessary in order
to construct a Monte Carlo representation of the data, to construct and evolve
neural parton distributions, and to train them in such a way that the correct
statistical features of the data are reproduced. We present the results of the
application of this method to the determination of the nonsinglet quark
distribution up to next--to--next--to--leading order, and compare them with
those obtained using other approaches.


title: Inflaton Fragmentation After lambda phi^4 Inflation

abstract:
  We use lattice simulations to examine the detailed dynamics of inflaton
fragmentation during and after preheating in $\lambda \phi^4$ chaotic
inflation. The dynamics are qualitatively similar to preheating after $m^2
\phi^2$ inflation, involving the exponential growth and subsequent expansion
and collision of bubble-like inhomogeneities of the inflaton and other scalar
fields. During this stage fluctuations of the fields become strongly
non-Gaussian. In the quartic theory, the conformal nature of the theory allows
us to extend our simulations to much greater times than is possible for the
quadratic model. With these longer simulations we have been able to determine
the time scale on which Gaussianity is restored, which occurs after a time on
the order of a thousand inflaton oscillations.


title:
Les Houches Lectures on Effective Field Theories and Gravitational
  Radiation

abstract:
  These lectures give an overview of the uses of effective field theories in
describing gravitational radiation sources for LIGO or LISA. The first lecture
reviews some of the standard ideas of effective field theory (decoupling,
matching, power counting) mostly in the context of a simple toy model. The
second lecture sets up the problem of calculating gravitational wave emission
from non-relativistic binary stars by constructing a tower of effective
theories that separately describe each scale in the problem: the internal size
of each binary constituent, the orbital separation, and the wavelength of
radiated gravitons.


title: Direct Photons in Ion Collisions at FAIR Energies

abstract:
  Estimations of prompt photon production at FAIR (Facility for Antiproton and
Ion Research) energies using the extrapolation of existing data are presented.
About $10^{-4}$ prompt $\gamma$ with $p_{t}>$2 GeV/c per Au+Au central event at
25 AGeV are expected. With the planed beam intensity $10^{9}/s$, 1% interaction
rate and 10% centrality, at CBM (Compressed Baryonic Matter) experiment one can
expect prompt $\gamma$ rate ~100/s.
  Predictions for direct photons by some generators (PYTHIA, UrQMD, RQMD, HSD,
HIJING) are analyzed. One of the main sources of direct photons (due to meson
scatterings $\pi\rho\to\pi\gamma, \pi\pi\to\rho\gamma$) is not implemented in
the heavy-ion generators. Corresponding cross-sections for this source have
been prepared for implementation into the HSD code.
  Main experimental methods to study direct photons (subtraction method,
momentum correlations method and internal conversion method) are shortly
reviewed. High intensity beam, good tracking and good $e^{\pm}$ particle
identification of the CBM detector favor to measure direct photons by all the
methods.


title: The two types of Cherenkov gluons at LHC energies

abstract:
  Beside comparatively low energy Cherenkov gluons observed at RHIC, there
could be high energy gluons at LHC, related to the high energy region of
positive real part of the forward scattering amplitude. In both cases they give
rise to particles emitted along some cone. The characteristics of the cones
produced by these two types of gluons are different. Therefore different
experiments are needed to detect them. The cosmic ray event which initiated
this idea is described in detail.


title: A renormalizable effective theory for leading logarithms in ChPT

abstract:
  We argue that the linear sigma model at small external momenta is an
effective theory for the leading logarithms of chiral perturbation theory.
Based on this assumption an attempt is made to sum these leading logarithms
using the standard renormalization group techniques, which are valid in
renormalizable quantum field theories.


title: Monopolium: the key to monopoles

abstract:
  Dirac showed that the existence of one magnetic pole in the universe could
offer an explanation for the discrete nature of the electric charge. Magnetic
poles appear naturally in most Grand Unified Theories. Their discovery would be
of greatest importance for particle physics and cosmology. The intense
experimental search carried thus far has not met with success. Moreover, if the
monopoles are very massive their production is outside the range of present day
facilities. A way out of this impasse would be if the monopoles bind to form
monopolium, a monopole- antimonopole bound state, which is so strongly bound,
that it has a relatively small mass. Under these circumstances it could be
produced with present day facilities and the existence of monopoles could be
indirectly proven. We study the feasibility of detecting monopolium in present
and future accelerators.


title:
Complete one-loop corrections to decays of charged and CP-even neutral
  Higgs bosons into sfermions

abstract:
  We present the full one-loop corrections to charged and CP-even neutral Higgs
boson decays into sfermions including also the crossed channels. The
calculation was carried out in the minimal supersymmetric extension of the
Standard Model and we use the on-shell renormalization scheme. For the
down-type sfermions, we use DR-running fermion masses and the trilinear
coupling A_f as input. Furthermore, we present the first numerical analysis for
decays according to the Supersymmetric Parameter Analysis project. This
requires the renormalization of the whole MSSM. The corrections are found to be
numerically stable and not negligible.