title: Diffractive Higgs production

abstract:
  Instrumenting the LHC to measure the outgoing protons in the process pp ->
p+X+p opens up new possibilities for physics studies in the Standard Model and
beyond. In this talk I first present an overview of the underlying QCD
calculation and its uncertainties. I then move on to present a variety of new
physics scenarios which one would want to explore via this unique channel.
There is a short discussion of the recent CDF data which may provide evidence
for the existence of central exclusive jet production at the Tevatron.


title: Diffraction 2006: Theoretical Summary

abstract:
  This paper presents a summary of the theoretical presentations to the
international workshop "Diffraction 2006". The range of topics covered during
the workshop was quite broad and this summary is therefore somewhat selective
covering recent developments in BFKL physics, exclusive processes, saturation
dynamics, DIS and structure functions and coherence in QCD.


title: Candidates for dark matter in the ${SU}(3)_C {SU}(3)_L {U}(1)_N$ models

abstract:
  It has recently been pointed out that the 511 keV emission line detected by
INTEGRAL/SPI from the bulge of our galaxy could be explained by annihilations
of light dark matter particles into $e^+ e^-$. We present the possibility that
dark matter could be made of scalar candidates, namely, of the Higgs bosons in
the models based on ${SU}(3)_C\otimes {SU}(3)_L \otimes {U}(1)_N$ (3-3-1) gauge
group. These particles are singlet of the ${SU}(2)_L \otimes {U}(1)_Y$ group,
so they do not interact with the ordinary particles, exept the Higgs boson in
the standard model. The Spergel-Steinhardt condition for self-interacting dark
matter gives a bound on the mass of the candidates to be a few MeVs. Besides
the scalar candidates, which exist in both non-SUSY and SUSY 3-3-1 models with
right-handed neutrinos, the spin $\fr 1 2$ candidate exists in a variant 3-3-1
version with exotic neutral lepton. In contrast to the singlet models, where an
extra symmetry must be imposed to account the stability of the dark matter,
here the decay of the candidates is automatically forbidden in all orders of
perturbative expansion. This is because of the following feature: these scalars
are singlets, i.e., in bottom of the Higgs triplet. Therefore, the standard
model fermions and the standard gauge bosons cannot couple with them.


title: Light Meson Decay Constants

abstract:
  We estimate the decay constants $f_\pi$ and $f_K$ of the light mesons within
a relativistic quantum-field model of interacting quarks and gluons confined
analytically. The necessary physical parameters, the quark masses $m_u$ and
$m_s$, the coupling constant $\alpha_s$ and the confinement scale $\Lambda$
have been obtained from our previous investigation on the meson ground states,
orbital and radial excitations by using the ladder Bethe-Salpeter equation. Our
approach provides a solid framework to compute the meson spectra, the lowest
glueball state and decay constants of pseudoscalar mesons (as well as other
physical observables) nonperturbatively from the basic principles of QCD and
QFT.


title: Warped Axions

abstract:
  We study a number of realizations of axions existing in a multi-`throat'
generalization of the warped throat geometry of a Randall-Sundrum slice of
$AdS_5$. As argued by previous authors, the problem of generating a suitable,
phenomenologically allowed Peccei-Quinn scale is simply and elegantly solved by
the warping. In compactifications with two or more throats it is possible to
simultaneously solve the Standard Model hierarchy problem by the
Randall-Sundrum mechanism while implementing interesting warped axion models.
The constructions discussed are related to holographic duals of previously
studied models of composite axions arising from strongly coupled
four-dimensional dynamics.


title: Beyond the Standard Model

abstract:
  Review of recent developments in attempts to go beyond the Standard Model is
given. We concentrate on three main unresolved problems: mechanism of
electroweak symmetry breaking, expected new physics at the TeV scale (mainly
SUSY) and the origin of the Dark matter.


title: Extracting alpha from B0(d) --> K0 anti-K0 Decays

abstract:
  We propose a new method for obtaining the CP phase alpha, based on
measurements of B0(d) --> K0 anti-K0, along with theoretical input. Due to the
similarities of QCD factorization (QCDf) and perturbative QCD (pQCD), this
input is basically the same for each of these models. Although the theoretical
error is large at present, many of the contributing quantities will be better
known in the future, leading to a smaller error. One outstanding question is
the extent to which the precision on quark masses, especially m_c/m_b, can be
improved. If one assumes that new physics is not present, the method can be
used to predict the values of CP asymmetries in B0(d) --> K0 anti-K0: 0.02 <=
A_{dir}^2 + A_{mix}^2 <= 0.125. A result outside this range would signal the
existence of long-distance effects beyond those included in models of
nonleptonic decays based on factorization (such as QCDf and pQCD), or the
presence of new physics.


title:
QCD and Electroweak Interference in Higgs production by Gauge Boson
  Fusion

abstract:
  We explicitly calculate the contribution to Higgs production at the LHC from
the interference between gluon-gluon and Weak Vector Boson fusion, and compare
it to the pure QCD and pure Electro-weak result. While the effect is small at
tree level, we speculate it will be significantly enhanced by loop effects.


title: Exceptional and non-exceptional contributions to the radiative \pi decay

abstract:
  We have studied the spin-one resonance dominated form factors governing the
radiative decay of the \pi, within the framework of resonance chiral theory. We
obtain predictions for their value at zero momentum transfer and also a
description of their q^2 dependence.


title:
A Possible Universal Model without Singularity and its Explanation for
  Evolution of the Universe

abstract:
  New hypotheses are proposed that there are s-particles and v-particles which
are symmetric and mutually repulsive, there are S-space and V-space whose
essential difference is only that their expectation values of the Higgs fields
are different. In S-space the S-SU(5) symmetry is broken into S-SU(3)XU(1), and
V-SU(5) symmetry still holds. As a consequence, s-particles get their masses
determined by the SU(5) GUT and form the S-world, and v-particles are all
massless and form SU(5) colour-single states which are identified with dark
energy. The following results are obtained. There is no spacetime singularty,
and there is the highest temperature in the universe. The creating process of
one world is just the annihilating process of the other world in the highest
temperature. A formula which well describes the luminous distance and redshift
is obtained. The results of the Guth's inflationary scenario are obtained.
Decelerated expanding early stage and accelerated expanding now stage of the
universe are explained. New predictions are follows. Some huge cavities in
V-space are not empty, in which there is s-matter with larger density, and are
equivalent to huge concave lenses. The given tharacters of some huge cavities
are well explained. The gravitation between two galaxies distant enough will
lesser than that predicted by the conventional theory. A possible explanation
for the big redshift of quasi-stellar objects is presented. Huge redshifts of
quasars are mass redshifts. The universe is composed of infinite universal
islands. It is possible that there is a new annihilating mode of black holes
with their very huge masses, and there are very huge white holes which are
different from that predicted by conventional theory.


title:
Neutrino Phenomenology, Dark Energy and Leptogenesis from
  pseudo-Nambu-Goldstone Bosons

abstract:
  We consider a model of dynamical neutrino masses via the see-saw mechanism.
Nambu-Goldstone bosons (majorons) arise associated with the formation of the
heavy right-handed majorana masses. These bosons then acquire naturally soft
masses (become pNGB's) at loop level via the Higgs-Yukawa mass terms. These
models, like the original neutrino pNGB quintessence schemes of the 1980's that
proceed through the Dirac masses, are natural, have cosmological implications
through mass varying neutrinos, long range forces, and provide a soft potential
for dark energy. We further argue that these models can explain leptogenesis
naturally through the decays of the right-handed neutrinos.


title: Recoilless resonant neutrino capture and basics of neutrino oscillations

abstract:
  It is shown that the experiment on recoilless resonant emission and
absorption of $\bar \nu_{e}$, proposed recently by Raghavan, could have an
important impact on our understanding of the physics of neutrino oscillations.


title: Density Perturbations in Chain Inflation

abstract:
  We consider the model of ``Chain Inflation,'' in which the period of
inflation in our universe took the form of a long sequence of quantum tunneling
events. We find that in the simplest such scenario, in which the tunneling
processes are uniform, approximately 10^4 vacua per e-folding of inflation are
required in order that the density perturbations produced are of an acceptable
size. We arrive at this conclusion through a combination of analytic and
numerical techniques, which could also serve as starting points for
calculations with more general sets of assumptions.


title: Recoil proton distribution in high energy photoproduction processes

abstract:
  For high energy linearly polarized photon--proton scattering we have
calculated the azimuthal and polar angle distributions in inclusive on recoil
proton experimental setup. We have taken into account the production of lepton
and pseudoscalar meson charged pairs. The typical values of cross sections are
of order of hundreds of picobarn. The size of polarization effects are of order
of several percents. The results are generalized for the case of
electroproduction processes on the proton at rest and for high energy proton
production process on resting proton.


title:
The ArDM project: a Dark Matter Direct Detection Experiment based on
  Liquid Argon

abstract:
  The Dark Matter part of the universe presumably consists of WIMPs (Weakly
Interacting Massive Particles). The ArDM project aims at measuring signals
induced by WIMPs in a liquid argon detector. A 1-ton prototype is currently
developed with the goal of demonstrating the feasibility of such a direct
detection experiment with large target mass. The technical design of the
detector aims at ind ependently measuring the scintillation light and the
ionization charge originating from an interaction of a WIMP with an argon
nucleus. The principle of the experiment and the conceptual design of the
detector are described.


title: Logarithmic electroweak corrections to e+ e- -> nue anti-nue W+ W-

abstract:
  We consider W-boson scattering at high-energy e+ e- colliders and study
one-loop logarithmic electroweak corrections within the Standard Model assuming
a light Higgs boson. We present explicit analytical results for W+ W- -> W+ W-.
Using the equivalent vector-boson approximation, we have implemented these
corrections into a Monte Carlo program for the process e+ e- -> nue anti-nue W+
W-. The quality of the equivalent vector-boson approximation and of the
logarithmic high-energy approximation for the electroweak corrections is
discussed in detail. The impact of the radiative effects is quantitatively
analysed. The corrections are negative and their size, typically of the order
of 10%, increases with energy reaching up to -20% and -50% at the ILC and CLIC,
respectively.


title: The longitudinal cross section of vector meson electroproduction

abstract:
  We analyze electroproduction of light vector mesons (V=rho, phi and omega) at
small Bjorken-x in the handbag approach in which the process factorizes into
general parton distributions and partonic subprocesses. The latter are
calculated in the modified perturbative approach where the transverse momenta
of the quark and antiquark forming the vector meson are retained and Sudakov
suppressions are taken into account. Modeling the generalized parton
distributions through double distributions and using simple Gaussian
wavefunctions for the vector mesons, we compute the longitudinal cross sections
at large photon virtualities. The results are in fair agreement with the
findings of recent experiments performed at HERA and HERMES.


title: Recent advances in NRQCD

abstract:
  We discuss recent theoretical developments concerning the description of the
production and decay of heavy quarks and colored scalars in the framework of
nonrelativistic QCD.


title: Two-Loop Ultrasoft Running of the O(v^2) QCD Quark Potentials

abstract:
  The two-loop ultrasoft contributions to the next-to-leading logarithmic (NLL)
running of the QCD potentials at order v^2 are determined. The results
represent an important step towards the next-to-next-to-leading logarithmic
(NNLL) description of heavy quark pair production and annihilation close to
threshold.


title: Single Spin Asymmetry at Large x_F and k_T

abstract:
  The large single spin asymmetries observed at high momentum fractions x_F and
transverse momenta k_T in p^\uparrow p -> \pi(x_F,k_T)+X as well as in pp ->
\Lambda^\uparrow(x_F,k_T)+X suggest that soft helicity flip processes are
coherent with hard scattering. Such coherence can be maintained if x_F -> 1 as
k_T -> \infty, while k_T^2(1-x_F) \sim \Lambda_QCD^2 stays fixed. The entire
hadron wave function, rather than a single quark, then contributes to the
scattering process. Analogous coherence effects have been seen experimentally
in the Drell-Yan process at high x_F. We find that the p^\uparrow p ->
\pi(x_F,k_T)+X production amplitudes have large dynamic phases and that
helicity flip contributions are unsuppressed in this limit, giving rise to
potentially large single spin asymmetries.


title:
Light pseudoscalar eta and H->eta eta decay in the simplest little Higgs
  mode

abstract:
  The SU(3) simplest little Higgs model in its original framework without the
so-called mu term inevitably involves a massless pseudoscalar boson eta, which
is problematic for b-physics and cosmological axion limit. With the mu term
introduced by hand, the eta boson acquires mass m_eta ~ mu, which can be
lighter than half the Higgs boson mass in a large portion of the parameter
space. In addition, the introduced mu term generates sizable coupling of
H-eta-eta. The Higgs boson can dominantly decay into a pair of eta's especially
when mH below the WW threshold. Another new decay channel of H->Z+eta can be
dominant or compatible with H -> WW for mH above the Z+eta threshold. We show
that the LEP bound on the Higgs boson mass is loosened to some extent due to
this new H->eta eta decay channel as well as the reduced coupling of H-Z-Z. The
Higgs boson mass bound falls to about 110 GeV for f=3-4 TeV. Since the eta
boson decays mainly into a bb pair, H-> eta eta -> 4b and H-> Z eta -> Z bb
open up other interesting search channels in the pursuit of the Higgs boson in
the future experiments. We discuss on these issues.


title: An estimate of the B-->K*gamma form factor

abstract:
  We present the results of a lattice QCD calculation of the form factor
relevant to B-->K*gamma decay. Our final value, T(0) = 0.24 +/-
0.03(+0.04/-0.01), is obtained in the quenched approximation, and by
extrapolating T(q2=0;H--> K*)MH^(3/2) from the directly accessed H-heavy mesons
to the meson B. We also show that the extrapolation from B-->K*gamma* to
B-->K*gamma leads to a result consistent with the one quoted above. On the
other hand, our results are not accurate enough to solve the SU(3) flavor
breaking effects in the form factor and we quote T(q2=0;B-->
K*)/T(q2=0;B-->rho)=1.2(1), as our best estimate.


title: Fluctuations and Fermi-Dirac Correlations in e+e- annihilation

abstract:
  In this talk I first present a short review of fluctuations in
$e^+e^-$-annihilations. I then describe some new results on FD correlations.
Experimental analyses of $pp$ and $\Lambda\Lambda$ correlations indicate a very
small production radius. This result relies very strongly on comparisons with
MC simulations. A study of the approximations and uncertainties is these
simulations imply that it is premature to draw such a conclusion from the data.


title: Sivers Effect Asymmetries in Hadronic Collisions

abstract:
  We argue that weighted azimuthal single spin asymmetries in back-to-back jet
or pion production in polarized proton-proton scattering can be written as
convolutions of universal distribution and fragmentation functions with gluonic
pole cross sections as hard functions. Gluonic pole cross sections are
gauge-invariant weighted sums of Feynman diagrams. The weight factors are a
direct consequence of the (diagram-dependence of) gauge links. The best known
consequence of the gauge links is the generation of the Sivers effect that is a
source for single-spin asymmetries. Moreover, due to the dependence of the
gauge links on the color-flow of the hard diagram the Sivers effect in SIDIS
enters with opposite sign as it does in Drell-Yan scattering. The weight
factors in the gluonic pole cross sections are the appropriate generalizations
to more complicated processes of this relative sign difference. Furthermore, it
is argued that the gluon-Sivers effect appears in twofold.


title: The impact of the Sakata model

abstract:
  The evolution of the Sakata model is described on the basis of personal
recollections, proceedings of international conferences on high energy physics
and some journal articles.


title:
Improved Z -> gamma gamma decay in the renormalizable gauge sector of
  the noncommutative standard model

abstract:
  In this work we propose the Z -> gamma gamma decay as a process strictly
forbidden in the standard model, suitable for the search of noncommutativity of
coordinates at very short distances. We computed the Z -> gamma gamma partial
width in the framework of the recently proposed one-loop renormalizable gauge
sector of the noncommutative standard model. New experimental possibilities at
LHC are analyzed and a firm bound to the scale of noncommutativity parameter is
set around 1 TeV.


title: Real-time static potential in hot QCD

abstract:
  We derive a static potential for a heavy quark-antiquark pair propagating in
Minkowski time at finite temperature, by defining a suitable gauge-invariant
Green's function and computing it to first non-trivial order in Hard Thermal
Loop resummed perturbation theory. The resulting Debye-screened potential could
be used in models that attempt to describe the ``melting'' of heavy quarkonium
at high temperatures. We show, in particular, that the potential develops an
imaginary part, implying that thermal effects generate a finite width for the
quarkonium peak in the dilepton production rate. For quarkonium with a very
heavy constituent mass M, the width can be ignored for T \lsim g^2 M/12\pi,
where g^2 is the strong gauge coupling; for a physical case like bottomonium,
it could become important at temperatures as low as 250 MeV. Finally, we point
out that the physics related to the finite width originates from the
Landau-damping of low-frequency gauge fields, and could be studied
non-perturbatively by making use of the classical approximation.


title: Chiral extrapolation of lattice data for B-meson decay constant

abstract:
  The B-meson decay constant fB has been calculated from unquenched lattice QCD
in the unphysical region. For extrapolating the lattice data to the physical
region, we propose a phenomenological functional form based on the effective
chiral perturbation theory for heavy mesons, which respects both the heavy
quark symmetry and the chiral symmetry, and the non-relativistic constituent
quark model which is valid at large pion masses. The inclusion of pion loop
corrections leads to nonanalytic contributions to fB when the pion mass is
small. The finite-range regularization technique is employed for the
resummation of higher order terms of the chiral expansion. We also take into
account the finite volume effects in lattice simulations. The dependence on the
parameters and other uncertainties in our model are discussed.


title: Charm photoproduction at HERA: kt-factorization versus experimental data

abstract:
  We calculate the cross section of charm photoproduction at HERA collider in
the framework of the kt-factorization QCD approach. Our analysis cover the
inclusive charm production as well as charm and associated jet production
processes. Both photon-gluon and gluon-gluon fusion mechanisms are taken into
account. The unintegrated gluon densities in a proton and in a photon obtained
from the full CCFM, from unified BFKL-DGLAP evolution equations as well as from
the Kimber-Martin-Ryskin prescription are used. Our theoretical results are
compared with the recent experimental data taken by the H1 and ZEUS
collaborations at HERA. Special attention is put on the specific angular
correlations which can provide unique information about non-collinear gluon
evolution dynamics.


title: High energy DVCS on a photon and related meson exclusive production

abstract:
  In this work we estimate the differential cross section for the high energy
deeply virtual Compton scattering on a photon target within the QCD
dipole-dipole scattering formalism. For the phenomenology, a saturation model
for the dipole-dipole cross section for two photon scattering is considered.
Its robustness is supported by good description of current accelerator data. In
addition, we consider the related exclusive vector meson production processes.
This analysis is focused on the light $\rho$ and $\phi$ meson production, which
produce larger cross sections. The phenomenological results are compared with
the theoretical calculation using the CD BFKL approach.


title: On Heavy-Quark Free Energies, Entropies, Polyakov Loop, and AdS/QCD

abstract:
  In this paper we explore some of the features of a heavy quark-antiquark pair
at finite temperature using a five-dimensional framework nowadays known as
AdS/QCD. We shall show that the resulting behavior is consistent with our
qualitative expectations of thermal gauge theory. Some of the results are in
good agreement with the lattice data that provides additional evidence for the
validity of the proposed model.


title: Analytic properties of unitarization schemes

abstract:
  The analytic properties of the elastic hadron scattering amplitude are
examined in the impact parameter representation at high energies. Different
unitarization procedures and the corresponding non-linear equations are
presented. Several unitarisation schemes are presented. They lead to almost
identical results at the LHC.


title:
The New Sigma_b multiplet, heavy baryon mass predictions, meson-baryon
  universality and magnetic moments of Lambda_c and Lambda_b

abstract:
  The recent measurement by CDF M(Sigma_b)-M(Lambda_b)=192 MeV is in striking
agreement with our theoretical prediction M(Sigma_b)-M(Lambda_b) = 194 MeV. In
addition, the measured splitting M(Sigma_b*)-M(Sigma_b) = 21 MeV agrees well
with the predicted splitting of 22 MeV. We point out the connection between
these predictions and an effective supersymmetry between mesons and baryons
related by replacing a light antiquark by a light diquark. We discuss the
theoretical framework behind these predictions and use it to provide additional
predictions for the masses of spin-1/2 and spin-3/2 baryons containing heavy
quarks, as well as magnetic moments of Lambda_b and Lambda_c.


title: New analysis of semileptonic B decays in the relativistic quark model

abstract:
  We present the new analysis of the semileptonic B decays in the framework of
the relativistic quark model based on the quasipotential approach. Decays both
to heavy D^{(*)} and light \pi(\rho) mesons are considered. All relativistic
effects are systematically taken into account including contributions of the
negative-energy states and the wave function transformation from the rest to
moving reference frame. For heavy-to-heavy transitions the heavy quark
expansion is applied. Leading and subleading Isgur-Wise functions are
determined as the overlap integrals of initial and final meson wave functions.
For heavy-to-light transitions the explicit relativistic expressions are used
to determine the dependence of the form factors on the momentum transfer
squared. Such treatment significantly reduces theoretical uncertainties and
increases reliability of obtained predictions. All results for form factors,
partial and total decay rates agree well with recent experimental data and
unquenched lattice calculations. From this comparison we find the following
values of the Cabibbo-Kobayashi-Maskawa matrix elements:
|V_{cb}|=(3.85\pm0.15\pm 0.20)*10^{-2} and
|V_{ub}|=(3.82\pm0.20\pm0.20)*10^{-3}, where the first error is experimental
and the second one is theoretical.


title: Proton decay, supersymmetry breaking and its mediation

abstract:
  We study the breaking of supersymmetry and its transmission to the light
states in the context of the minimal SU(5) grand unified theory, with no
additional singlets. This simple theory can be taken as a prototype for a
program of breaking simultaneously grand unified symmetry and supersymmetry.
The main predictions are: (i) d=6 proton decay is completely negligible and d=5
is in accord with experiment, (ii) supersymmetry breaking is mainly mediated by
gravity.


title: Symmetry breaking from Scherk-Schwarz compactification

abstract:
  We analyze the classical stable configurations of an extra-dimensional gauge
theory, in which the extra dimensions are compactified on a torus. Depending on
the particular choice of gauge group and the number of extra dimensions, the
classical vacua compatible with four-dimensional Poincar\'e invariance and zero
instanton number may have zero energy. For SU(N) on a two-dimensional torus, we
find and catalogue all possible degenerate zero-energy stable configurations in
terms of continuous or discrete parameters, for the case of trivial or
non-trivial 't Hooft non-abelian flux, respectively. We then describe the
residual symmetries of each vacua.


title: Heavy Hadron Spectroscopy

abstract: I review recent theoretical advances in heavy hadron spectroscopy.


title: Soft leptogenesis in the inverse seesaw model

abstract:
  We consider leptogenesis induced by soft supersymmetry breaking terms ("soft
leptogenesis"), in the context of the inverse seesaw mechanism. In this model
there are lepton number (L) conserving and L-violating soft
supersymmetry-breaking B-terms involving the singlet sneutrinos which, together
with the -- generically small-- L-violating parameter responsible of the
neutrino mass, give a small mass splitting between the four singlet sneutrino
states of a single generation. In combination with the trilinear soft
supersymmetry breaking terms they also provide new CP violating phases needed
to generate a lepton asymmetry in the singlet sneutrino decays. We obtain that
in this scenario the lepton asymmetry is proportional to the L-conserving soft
supersymmetry-breaking B-term, and it is not suppressed by the L-violating
parameters. Consequently we find that, as in the standard see-saw case, this
mechanism can lead to sucessful leptogenesis only for relatively small value of
the relevant soft bilinear coupling. The right-handed neutrino masses can be
sufficiently low to elude the gravitino problem. Also the corresponding Yukawa
couplings involving the lightest of the right-handed neutrinos are constrained
to be \sum |Y_{1k}|^2\lesssim 10^{-7} which generically implies that the
neutrino mass spectrum has to be strongly hierarchical.


title: Gauge Mediation in Metastable Vacua

abstract:
  Until recently, dynamical supersymmetry breaking seemed an exceptional
phenomenon, involving chiral gauge theories with a special structure. Recently
it has become clear that requiring only metastable states with broken
supersymmetry leads to a far broader class of theories. In this paper, we
extend these constructions still further, finding new classes which, unlike
earlier theories, do not have unbroken, approximate $R$ symmetries. This allows
construction of new models with direct gauge mediation. These theories permit a
relatively compact solution to the $\mu$ problem.


title: Phenomenological Implications of a Class of Neutrino Mass Matrices

abstract:
  The generic predictions of two-texture zero neutrino mass matrices of class A
in the flavor basis have been reexamined especially in relation to the
degeneracy between mass matrices of types A_1 and A_2 and interesting
constraints on the neutrino parameters have been obtained. It is shown that the
octant of $\theta_{23}$ and the quadrant of the Dirac-type CP-violating phase
$\delta$ can be used to lift this degeneracy.


title: Fermion resonance in quantum field theory

abstract:
  We derive accurately the fermion resonance propagator by means of Dyson
summation of the self-energy contribution. It turns out that the relativistic
fermion resonance differs essentially from its boson analog.


title: Getting to Know BFKL

abstract:
  As a 30th anniversary tribute, I discuss the present and possible future
impact of the physics and the physicists of BFKL.


title:
Wedgebox analysis of four-lepton events from neutralino pair production
  at the LHC

abstract:
  `Wedgebox' plots constructed by plotting the di-electron invariant mass
versus the di-muon invariant mass from pp -> e^+e^- mu^+ mu^- + missing energy
signature LHC events. Data sets of such events are obtained across the MSSM
input parameter space in event-generator simulations, including cuts designed
to remove SM backgrounds. Their study reveals several general features:
(1)Regions in the MSSM input parameter space where a sufficient number of
events are expected so as to be able to construct a clear wedgebox plot are
delineated. (2)The presence of box shapes on a wedgebox plot either indicates
the presence of heavy Higgs bosons decays or restricts the location to a quite
small region of low \mu and M_2 values \lsim 200 GeV, a region denoted as the
`lower island'. In this region, wedgebox plots can be quite complicated and
change in pattern rather quickly as one moves around in the (\mu, M_2) plane.
(3)Direct neutralino pair production from an intermediate Z^{0*} may only
produce a wedge-shape since only \widetilde{\chi}_2^0\widetilde{\chi}_3^0
decays can contribute significantly. (4)A double-wedge or
wedge-protruding-from-a-box pattern on a wedgebox plot, which results from
combining a variety of MSSM production processes, yields three distinct
observed endpoints, almost always attributable to \widetilde{\chi}_{2,3,4}^0
\to \widetilde{\chi}_1^0 \ell^+\ell^- decays, which can be utilized to
determine a great deal of information about the neutralino and slepton mass
spectra and related MSSM input parameters. Wedge and double-wedge patterns are
seen in wedgebox plots in another region of higher \mu and M_2 values, denoted
as the`upper island.' Here the pattern is simpler and more stable as one moves
across the (\mu, M_2) input parameter space.


title: The gamma-N -> Delta transition in chiral effective-field theory

abstract:
  We describe the pion electroproduction processes in the
$\Delta$(1232)-resonance region within the framework of chiral effective-field
theory. By studying the observables of pion electroproduction in a
next-to-leading order calculation we are able to make predictions and draw
conclusions on the properties of the $N\to \Delta$ electromagnetic form
factors.


title: New QCD Sum Rule for $D(0^+)$

abstract:
  We derive a new QCD sum rule for $D(0^+)$ which has only the $D\pi$ continuum
with a resonance in the hadron side, using the assumption similar to that has
been successfully used in our previous work to the mass of $D_s(0^+)(2317)$.
For the value of the pole mass $M_c=1.38 $ GeV as used in the $D_s(0^+)$ case
we find that the mass of $D(0^+)$ derived from this sum rule is significantly
lower than that derived from the sum rule with the pole approximation. Our
result is in agreement with the experimental dada from Belle.


title: A Candidate for $1^{--}$ Strangeonium Hybrid

abstract:
  We propose that the recently observed structure at 2175MeV by the Babar
Collaboration is a $1^{--}$ strangeonium hybrid, and we investigate this
interpretation from both the flux tube model and the constituent gluon model.
The decay patterns and decay width in the flux tube model and the constituent
gluon model (for the "gluon excited" hybrid) are very similar. The tetraquark
hypothesis is not favored by the available experimental data. The crucial test
of our scenario is suggested, furthermore, the promising channels which can
discriminate the hybrid interpretation from the tetraquark are also suggested.


title: Affleck-Dine baryogenesis in anomaly-mediated SUSY breaking

abstract:
  It has been known that in anomaly-mediated SUSY breaking model Affleck-Dine
baryogenesis does not work due to trapping of Affleck-Dine field into
charge-breaking minima. We show that when finite-temperature effect is properly
taken into account and if reheating temperature is relatively high, the problem
of falling into charge breaking global minima can be avoided and hence
Affleck-Dine baryogenesis works. Moreover, for the LH_u flat direction we
obtain a constraint on the mass of neutrino.


title: A nonequilibrium renormalization group approach to turbulent reheating

abstract:
  We use nonequilibrium renormalization group (RG) techniques to analyze the
thermalization process in quantum field theory, and by extension reheating
after inflation. Even if at a high scale $\Lambda$ the theory is described by a
non-dissipative $\lambda\phi^{4}$ theory, the RG running induces nontrivial
noise and dissipation. For long wavelength, slowly varying field
configurations, the noise and dissipation are white and ohmic, respectively.
The theory will then tend to thermalize to an effective temperature given by
the fluctuation-dissipation theorem.


title: The Relic Abundance of Long-lived Heavy Colored Particles

abstract:
  Long-lived colored particles with masses m > 200 GeV are allowed by current
accelerator searches, and are predicted by a number of scenarios for physics
beyond the standard model. We argue that such "heavy partons'' effectively have
a geometrical cross section (of order 10 mb) for annihilation at temperatures
below the QCD deconfinement transition. The annihilation process involves the
formation of an intermediate bound state of two heavy partons with large
orbital angular momentum. The bound state subsequently decays by losing energy
and angular momentum to photon or pion emission, followed by annihilation of
the heavy partons. This decay occurs before nucleosynthesis for m < 10^{11} GeV
for electrically charged partons and m < TeV for electrically neutral partons.
This implies that heavy parton lifetimes as long as 10^{14} sec are allowed
even for heavy partons with m ~ TeV decaying to photons or hadrons with
significant branching fraction.


title:
One-loop renormalization group equations of the neutrino mass matrix in
  the triplet seesaw model

abstract:
  Within the framework of the standard model plus one heavy Higgs triplet, we
derive a full set of one-loop renormalization group equations of the neutrino
mass matrix and Higgs couplings in both full and effective theories. The
explicit RGEs of neutrino masses, flavor mixing angles and CP-violating phases
are also obtained, and their non-trivial running behaviors around the Higgs
triplet mass threshold are numerically illustrated.


title: Constructing the CKM and PMNS matrices from mixing data

abstract:
  The CKM and PMNS matrices have been constructed based on the latest
measurements, largely free from theoretical inputs as well as likely NP effects
in the case of the former. To facilitate the construction of the CKM matrix in
the PDG representation as well as in view of the comparatively large error in
the measured value of the CP violating phase \delta, the possibility of its
construction from the tree level measured CKM elements has also been explored
using the unitarity triangle. In view of the persistent difference between the
|V_{ub}| exclusive and inclusive values, we have carried out separate analyses
corresponding to these. The PMNS matrix has been constructed by incorporating
the constraints due to solar and atmospheric neutrinos as well as by giving
full variation to the Dirac-like CP violating phase \delta and considering
different values of s_{13} having implications for different models of lepton
mass matrices. Taking clue from quark mixing phenomenology, an analogous
analysis of the leptonic unitarity triangle allows an estimate of the likely
presence of CP violation in the leptonic sector.


title: Unitarity Constraints on effective interaction in $\pi N$ scattering

abstract:
  Positivity constraints are derived on pion-nucleon scattering amplitudes and
their even-order derivatives inside the Mandelstam Triangle with the help of
dispersion relations. Fairly interesting constraints are obtained on some of
the low energy constants, by a combination of the chiral perturbation theory
for heavy baryons and existing fitting results from available pion-nucleon
phase shifts at intermediate energies.


title:
The Higgs Boson Masses and Mixings of the Complex MSSM in the
  Feynman-Diagrammatic Approach

abstract:
  New results for the complete one-loop contributions to the masses and mixing
effects in the Higgs sector are obtained for the MSSM with complex parameters
using the Feynman-diagrammatic approach. The full dependence on all relevant
complex phases is taken into account, and all the imaginary parts appearing in
the calculation are treated in a consistent way. The renormalization is
discussed in detail, and a hybrid on-shell/DRbar scheme is adopted. We also
derive the wave function normalization factors needed in processes with
external Higgs bosons and discuss effective couplings incorporating leading
higher-order effects. The complete one-loop corrections, supplemented by the
available two-loop corrections in the Feynman-diagrammatic approach for the
MSSM with real parameters and a resummation of the leading (s)bottom
corrections for complex parameters, are implemented into the public Fortran
code FeynHiggs2.5. In our numerical analysis the full results for the
Higgs-boson masses and couplings are compared with various approximations, and
CP-violating effects in the mixing of the heavy Higgs bosons are analyzed in
detail. We find sizable deviations in comparison with the approximations often
made in the literature.


title: Static polarizability vertex and its applications

abstract:
  Using the Lagrangian that was developed on the corresponding principle
between the moving medium electrodynamic and quantum field theory the explicit
expression for the static polarizability vertex has been obtained. The
applications of this vertex for calculations of real Compton scattering
amplitude as well as the imaginary part of doubly virtual Compton scattering
amplitude have been demonstrated.


title:
Timelike and spacelike hadron form factors, Fock state components and
  light-front dynamics

abstract:
  A unified description of spacelike and timelike hadron form factors within a
light-front model was successfully applied to the pion. The model is extended
to the nucleon to study the role of $q \bar q$ pair production and of
nonvalence components in the nucleon form factors. Preliminary results in the
spacelike range $0 \le Q^2 \le 10 ~ (GeV/c)^2$ are presented.


title: Forward-backward rapidity correlations in a two-step scenario

abstract:
  We argue that two-step models, like String and Glasma models, with creation
first of sources extended in rapidity that after locally decay into particles,
lead to long range forward-backward correlations due to fluctuations in the
number or the colour of the sources, and to a similar expression for the {\it
F-B} correlation parameter $b$.
  In the simplest String percolation scenario, $b$ increases with centrality or
the number of participating nucleons. However, asymptotically it decreases with
energy. This is different from the Glasma model where $b$ increases with both,
centrality and energy.


title: A satisfactory empirical mass sum rule for charged leptons

abstract:
  In the framework of a mass formula proposed previously (transforming in a
specific way three free parameters into three masses), a simple empirical sum
rule for three charged-lepton masses is found, predicting m_\tau = 1776.9926
MeV, when the experimental values of m_e and m_\mu are used as an input. The
experimental value to be compared with is m_\tau = 1776.99^{+0.29}_{-0.26} MeV.
This satisfactory sum rule (equivalent to a simple parameter constraint in the
mass formula) is linear in masses and involves integers as its coefficients.
The author believes that such a simple and precise mass sum rule for charged
leptons may help in the process of developing realistic models for mass spectra
of fundamental fermions. In the second part of the paper, another equivalent
parametrization of the charged-lepton mass formula is described, corresponding
to an oscillatory picture of their mass matrix, where two matrices appear
playing the role of annihilation and creation operators in the generation
space.


title: Gallium data variability and KamLAND

abstract:
  We present an alternative fit to the conventional solar+KamLAND one which
takes into account the possible time dependence of the Ga data and relies on
the partial conversion of active $\to$ sterile neutrinos via the magnetic
moment/solar field interaction. We evaluate the prediction for the solar
neutrino rates obtaining a fit of similar quality as the LMA one. We also
evaluate the KamLAND antineutrino survival probability as a function of reactor
distance and find a better agreement with data as compared to LMA.


title: Photon production from an anisotropic quark-gluon plasma

abstract:
  We calculate photon production from a quark-gluon plasma which is anisotropic
in momentum space including the Compton scattering and quark/anti-quark
annihilation processes. We show that for a quark-gluon plasma which has an
oblate momentum-space anisotropy the photon production rate has an angular
dependence which is peaked transverse to the beam line. We propose to use the
angular dependence of high-energy medium photon production to experimentally
determine the degree of momentum-space isotropy of a quark-gluon plasma
produced in relativistic heavy-ion collisions.


title:
T-odd distributions, breaking of long range correlations, and sudden
  entropy changes, in Drell-Yan high-energy processes

abstract:
  T-odd parton distribution functions in a Drell-Yan process are here studied
by examining the evolution of the internal statistical properties of the
interacting hadrons. T-odd functions are shown to be a signature of the
irreversible process in which a hadronic state characterized by long range
correlation properties (hadronic phase) decays to produce a cloud of
independent partons (partonic phase) because of initial/final state
interactions. The relevant considered variable is the rate of increase of the
entropy of the hadronic system. This quantity is shown to be roughly equal to
the decay rate of the hadronic state. Conditions for getting a leading twist
T-odd effect are established on this basis. Last, the relevant case of a large
entropy increase associated with transverse-dominated initial/final state
interactions is analyzed.


title:
Comment on ``Spin light of neutrino in matter: a new type of
  electromagnetic radiation''

abstract:
  We show that a criticism made in hep-ph/0610294 against our paper Mod. Phys.
Lett. A21, 1769 (2006) has no ground. We confirm that all results of
investigations of the so-called ``spin light of neutrino (SL \nu)'' are
incorrect because of the medium influence on photon dispersion. With taking
account of this influence, both the SL \nu radiation rate and the total power
are zero for neutrinos in all real astrophysical conditions.


title: Inflation and nonequilibrium renormalization group

abstract:
  We study de spectrum of primordial fluctuations and the scale dependence of
the inflaton spectral index due to self-interactions of the field. We compute
the spectrum of fluctuations by applying nonequilibrium renormalization group
techniques.


title:
The charmonium and bottomonium mass spectroscopy with a simple
  approximaton of the kinetic term

abstract:
  In this paper we propose a particular description of meson spectroscopy, with
emphasis in heavy bound states like charmonia and bottomonia, after working on
the main aspects of the construction of an effective potential model. We use
the prerogatives from ``soft QCD'' to determine the effective potential terms,
establishing the asymptotic Coulomb term from one gluon exchange approximation.
At the same time, a linear confinement term is introduced in agreement with QCD
and phenomenological prescription. The main aspect of this work is the
simplification in the calculation, consequence of a precise and simplified
description of the kinetic term of the Hamiltonian. With this proposition we
perform the calculations of mass spectroscopy for charmonium and bottomonium
mesons and we discuss the real physical possibilities of developing a
generalized potential model, its possible advantages relative to experimental
parameterization and complexity in numerical calculations.


title: Quantum Zeno effect and the impact of flavor in leptogenesis

abstract:
  In thermal leptogenesis, the cosmic matter-antimatter asymmetry is produced
by CP violation in the decays N --> l + \Phi of heavy right-handed Majorana
neutrinos N into ordinary leptons l and Higgs particles \Phi. If some
charged-lepton Yukawa couplings are in equilibrium during the leptogenesis
epoch, the l interactions with the background medium are flavor sensitive and
the coherence of their flavor content defined by N --> l+\Phi is destroyed,
modifying the efficiency of the inverse decays. We point out, however, that it
is not enough that the flavor-sensitive processes are fast on the cosmic
expansion time scale, they must be fast relative to the N <--> l +\Phi
reactions lest the flavor amplitudes of l remain frozen by the repeated N <-->
l+\Phi ``measurements''. Our more restrictive requirement is significant in the
most interesting ``strong wash-out case'' where N <--> l +\Phi is fast relative
to the cosmic expansion rate. We derive conditions for the unflavored treatment
to be adequate and for flavor effects to be maximal. In this ``fully flavored
regime'' a neutrino mass bound survives. To decide if this bound can be
circumvented in the intermediate case, a full quantum kinetic treatment is
required.


title: Leptogenesis and Low Energy CP Violation in Neutrino Physics

abstract:
  Taking into account the recent progress in the understanding of the lepton
flavour effects in leptogenesis, we investigate in detail the possibility that
the CP-violation necessary for the generation of the baryon asymmetry of the
Universe is due exclusively to the Dirac and/or Majorana CP-violating phases in
the PMNS neutrino mixing matrix U, and thus is directly related to the low
energy CP-violation in the lepton sector (e.g., in neutrino oscillations,
etc.). We first derive the conditions of CP-invariance of the neutrino Yukawa
couplings lambda in the see-saw Lagrangian, and of the complex orthogonal
matrix R in the ``orthogonal'' parametrisation of lambda. We show, e.g. that
under certain conditions i) real R and specific CP-conserving values of the
Majorana and Dirac phases can imply CP-violation, and ii) purely imaginary R
does not necessarily imply breaking of CP-symmetry. We study in detail the case
of hierarchical heavy Majorana neutrino mass spectrum, presenting results for
three possible types of light neutrino mass spectrum: i) normal hierarchical,
ii) inverted hierarchical, and iii) quasi-degenerate. Results in the
alternative case of quasi-degenerate in mass heavy Majorana neutrinos, are also
derived. The minimal supersymmetric extension of the Standard Theory with
right-handed Majorana neutrinos and see-saw mechanism of neutrino mass
generation is discussed as well. We illustrate the possible correlations
between the baryon asymmetry of the Universe and i) the rephasing invariant
J_CP controling the magnitude of CP-violation in neutrino oscillations, or ii)
the effective Majorana mass in neutrinoless double beta decay, in the cases
when the only source of CP-violation is respectively the Dirac or the Majorana
phases in the neutrino mixing matrix.


title: Melting rho Meson and Thermal Dileptons

abstract:
  We give a brief survey of theoretical evaluations of light vector mesons in
hadronic matter, focusing on results from hadronic many-body theory. We
emphasize the importance of imposing model constraints in obtaining reliable
results for the in-medium spectral densities. The latter are subsequently
applied to the calculation of dilepton spectra in high-energy heavy-ion
collisions, with comparisons to recent NA60 data at the CERN-SPS. We discuss
aspects of space-time evolution models and the decomposition of the excess
spectra into different emission sources.


title: Associated Charmonium Production in Low Energy p-pbar Annihilation

abstract:
  The QCD mechanisms underlying the exclusive strong decays and hadronic
production amplitudes of charmonium remain poorly understood, despite decades
of study and an increasingly detaled body of experimental information. One set
of hadronic channels of special interest are those that include
baryon-antibaryon states. These are being investigated experimentally at BES
and CLEO-c in terms of their baryon resonance content, and are also of interest
for the future PANDA experiment, in which charmonium and charmonium hybrids
will be produced in p-pbar annihilation in association with light mesons. In
this paper we develop a simple initial-state light meson emission model of the
near-threshold associated charmonium production processes p pbar -> pi0 ccbar,
and evaluate the differential and total cross sections for these reactions in
this model. (Here we consider the ccbar states eta_c, J/psi, psi', chi_0 and
chi_1.) The predicted near-threshold cross section for p pbar -> pi0 J/psi is
found to be numerically similar to two previous theoretical estimates, and is
roughly comparable to the (sparse) existing data for this process. The
theoretical charmonium angular distributions predicted by this model are far
from isotropic, which may be of interest for PANDA detector design studies.


title: Walking in the SU(N)

abstract:
  We study the phase diagram as function of the number of colours and flavours
of asymptotically free non-supersymmetric theories with matter in higher
dimensional representations of arbitrary SU(N) gauge groups. Since matter in
higher dimensional representations screens more than in the fundamental a
general feature is that a lower number of flavours is needed to achieve a
near-conformal theory. We study the spectrum of the theories near the fixed
point and consider possible applications of our analysis to the dynamical
breaking of the electroweak symmetry.


title:
The construction of Dirac wave packets for a fermionic particle
  non-minimally coupling with an external magnetic field

abstract:
  We shall proceed with the construction of normalizable Dirac wave packets for
{\em fermionic} particles (neutrinos) with dynamics governed by a ``modified''
Dirac equation with a non-minimal coupling with an external magnetic field. We
are not only interested on the analytic solutions of the ``modified'' Dirac
wave equation but also on the construction of Dirac wave packets which can be
used for describing the dynamics of some observable physical quantities which
are relevant in the context of the quantum oscillation phenomena. To conclude,
we discuss qualitatively the applicability of this formal construction in the
treatment of chiral (and flavor) oscillations in the theoretical context of
neutrino physics.


title:
The gauge boson masses for a minimal $SU(4)_{EW} \otimes U(1)_{B-l}$
  model for electroweak interactions with left-right symmetry

abstract:
  Gauge boson masses for a minimal $SU(4)_{EW} \otimes U(1)_{B-l}$
model]{Following the general procedure of spontaneous symmetry breaking of a
$SU(4)_{EW} \otimes U(1)_{B-l}$ electroweak gauge group with left-right
symmetry, we obtain the gauge boson masses and currents for the minimal version
of the model. The physical eigenstates for neutral gauge bosons are determined
by introducing two mixing angles $\theta_4$ and $\theta_3$ which are related to
the electroweak mixing angle $\theta_w$ at the unification scale. By
introducing some physical approaches in order to simplify the calculations, we
calculate the charged and neutral currents. Differently from other previous
propositions, the results are obtained from a theoretical constraint upon the
coupling constants as a consequence of embedding the symmetry into the
Pati-Salam electroweak coupling $SU(4)_{EW} \otimes SU(4)_{PS}$.


title:
The charmonium and bottomonium mass spectroscopy with a simple
  approximation of the kinetic term

abstract:
  This submission has been withdrawn by the authors because it is a duplicate
of arXiv:hep-ph/0611336. It was due to a technical submission error by the
authors.


title: The rotation of magnetic field does not impact vacuum birefringence

abstract:
  We study how the rotation of a classical magnetic field influences vacuum
birefringence. In spite of the fact that solutions of the wave equation depend
in a non-trivial way on the relative magnitude of the strength of vacuum
birefringence and the angular rotation frequency of the magnetic field, the
induced ellipticity of the light ray does not depend on the magnetic field
angular rotation frequency. Hence, in contrast to recent claims, the result of
the PVLAS experiment cannot be explained by conventional non-linear quantum
electrodynamics.


title: Quark condensates in the chiral bag with the NJL interaction

abstract:
  We discuss the quark condensate of the vacuum inside the baryon. We analyze
the 1+1 dimensional chiral bag in analogy with the realistic 3+1 dimensional
one. The Nambu--Jona-Lasinio (NJL) type interaction is used to investigate the
quark condensate in the chiral bag. Considering the strong meson-quark
coupling, we solve the mean field solution to the scalar and pseudoscalar
channels by including the chiral Casimir effects. The self-consistent equation
allows a finite value of the quark condensate and hence a finite dynamical
quark mass inside the bag. It is shown that an approximate Cheshire Cat picture
holds for massive quarks.


title: QCD vacuum condensates from tau-lepton decay data

abstract:
  The QCD vacuum condensates in the Operator Product Expansion are extracted
from the final ALEPH data on vector and axial-vector spectral functions from
$\tau$-decay. Weighted Finite Energy Sum Rules are employed in the framework of
both Fixed Order and Contour Improved Perturbation Theory. An overall
consistent picture satisfying chirality constraints can be achieved only for
values of the QCD scale below some critical value $\Lambda\simeq350 {MeV}$. For
larger values of $\Lambda$, perturbation theory overwhelms the power
corrections. A strong correlation is then found between $\Lambda$ and the
resulting values of the condensates. Reasonable accuracy is obtained up to
dimension $d=8$, beyond which no meaningful extraction is possible.


title: Production of a W boson and two jets with one b-quark tag

abstract:
  The production of a W boson and two jets, at least one of which contains a b
quark, is a principal background to single-top production, Higgs production,
and signals of new physics at hadron colliders. We present a
next-to-leading-order (NLO) calculation of the cross section at the Fermilab
Tevatron and the CERN Large Hadron Collider. The NLO cross section differs
substantially from that at LO, and we provide a context in which to understand
this result.


title: The chromo-Weibel instability

abstract:
  I discuss the physics of non-Abelian plasmas which are locally anisotropic in
momentum space. Such momentum-space anisotropies are generated by the rapid
longitudinal expansion of the matter created in the first 1 fm/c of an
ultrarelativistic heavy ion collision. In contrast to locally isotropic plasmas
anisotropic plasmas have a spectrum of soft unstable modes which are
characterized by exponential growth of transverse chromo-magnetic/-electric
fields at short times. This instability is the QCD analogue of the Weibel
instability of QED. Parametrically the chromo-Weibel instability provides the
fastest method for generation of soft background fields and dominates the
short-time dynamics of the system. The existence of the chromo-Weibel
instability has been proven using diagrammatic methods, transport theory, and
numerical solution of classical Yang-Mills fields. I review the results
obtained from each of these methods and discuss the numerical techniques which
are being used to determine the late-time behavior of plasmas subject to a
chromo-Weibel instability.


title: Astrophysical Axion Bounds

abstract:
  Axion emission by hot and dense plasmas is a new energy-loss channel for
stars. Observational consequences include a modification of the solar
sound-speed profile, an increase of the solar neutrino flux, a reduction of the
helium-burning lifetime of globular-cluster stars, accelerated white-dwarf
cooling, and a reduction of the supernova SN 1987A neutrino burst duration. We
review and update these arguments and summarize the resulting axion
constraints.


title:
Small Visible Energy Scalar Top Iterative Discriminant Analysis for
  Different Center-of-Mass Energies

abstract:
  Light scalar top quarks with a small mass difference with respect to the
neutralino mass are of particular cosmological interest. This study uses an
Iterative Discriminant Analysis method to optimize the expected selection
efficiency at a International Linear Collider (ILC). A previous study at
sqrt(s)=260 GeV with 50 fb-1 has been extended to sqrt(s)=500 GeV with 500
fb-1, and results from both studies are compared.


title: Searching for dark matter sterile neutrino in laboratory

abstract:
  If the dark matter of the Universe is made of sterile neutrinos with the mass
in keV region they can be searched for with the help of X-ray satellites. We
discuss the prospects of laboratory experiments that can be competitive and
complimentary to Space missions. We argue that the detailed study of beta
decays of tritium and other nuclei with the help of Cold Target Recoil Ion
Momentum Spectroscopy (COLTRIMS) can potentially enter into interesting
parameter range and even supersede the current astronomical bounds on the
properties of dark matter sterile neutrino.


title:
MSSM Higgs-boson production in bottom-quark fusion: electroweak
  radiative corrections

abstract:
  Higgs-boson production in association with bottom quarks is an important
discovery channel for supersymmetric Higgs particles at hadron colliders for
large values of tan(beta). We present the complete O(alpha) electroweak and
O(alpha_s) strong corrections to associated bottom-Higgs production through bb
fusion in the MSSM and improve this next-to-leading-order prediction by known
two-loop contributions to the Higgs self-energies, as provided by the program
FeynHiggs. Choosing proper renormalization and input-parameter schemes, the
bulk of the corrections (in particular the leading terms for tan(beta)) can be
absorbed into an improved Born approximation. The remaining non-universal
corrections are typically of the order of a few per cent. Numerical results are
discussed for the benchmark scenarios SPS 1b and SPS 4.


title: Pinch Technique for Schwinger-Dyson equations

abstract:
  In the context of scalar QED we derive the pinch technique self-energies and
vertices directly from the Schwinger-Dyson equations. After reviewing the
perturbative construction, we discuss in detail the general methodology and the
basic field-theoretic ingredients necessary for the completion of this task.
The construction requires the simultaneous treatment of the equations governing
the scalar self-energy and the fundamental interaction vertices. The resulting
non-trivial rearrangement of terms generates dynamically the Schwinger-Dyson
equations for the corresponding Green's functions of the background field
method. The proof relies on the extensive use of the all-order Ward-identities
satisfied by the full vertices of the theory and by the
one-particle-irreducible kernels appearing in the usual skeleton expansion. The
Ward identities for these latter quantities are derived formally, and several
subtleties related to the structure of the multiparticle kernels are addressed.
The general strategy for the generalization of the method in a non-Abelian
context is briefly outlined, and some of the technical difficulties are
discussed.


title: Energy gain of heavy quarks by fluctuations in the QGP

abstract:
  The collisional energy gain of a heavy quark due to chromo-electromagnetic
field fluctuations in a quark-gluon plasma is investigated. The field
fluctuations lead to an energy gain of the quark for all temperatures and
velocities. The net effect is a reduction of the collisional energy loss by
15-40% for parameters relevant at RHIC energies.


title:
Three-Parton Contributions to B --> M_1 M_2 Annihilation at Leading
  Order

abstract:
  We compute annihilation amplitudes for charmless B decays that are
proportional to the three-parton twist-3 light meson distribution amplitude
phi_{3M}(x1,x2) with an active gluon. Due to an enhancement from a quark
propagator at the scale p^2 ~ mb\Lambda_QCD these terms occur at the same
parametric order in alpha_s(mb) and 1/mb as the known leading order
annihilation involving fB and twist-2 meson distributions. With our calculation
the leading order annihilation amplitude is now complete. At lowest order in
alpha_s the amplitudes are real and only O_{5-8} contribute. Using simple
models we find that the three-parton and two-parton terms are of comparable
size.


title: On the Impact of Flavour Oscillations in Leptogenesis

abstract:
  When lepton flavour effects in thermal leptogenesis are active, they
introduce important differences with respect to the case in which they are
neglected, the so-called one-flavour approximation. We investigate analytically
and numerically the transition from the one-flavour to the two-flavour case
when the $\tau$-lepton flavour becomes distinguishable from the other two
flavours. We study the impact of the oscillations of the asymmetries in lepton
flavour space on the final lepton asymmetries, for the hierarchical
right-handed neutrino mass spectrum. Flavour oscillations project the lepton
state on the flavour basis very efficiently. We conclude that flavour effects
are relevant typically for $M_1\lsim 10^{12}$ GeV, where $M_1$ is the mass of
the lightest right-handed neutrino.


title: The Gaugephobic Higgs

abstract:
  We present a class of models that contains Randall-Sundrum and Higgsless
models as limiting cases. Over a wide range of the parameter space WW
scattering is mainly unitarized by Kaluza-Klein partners of the W and Z, and
the Higgs particle has suppressed couplings to the gauge bosons. Such a
gaugephobic Higgs can be significantly lighter than the 114 GeV LEP bound for a
standard Higgs, or heavier than the theoretical upper bound. These models
predict a suppressed single top production rate and unconventional Higgs
phenomenology at the LHC: the Higgs production rates will be suppressed and the
Higgs branching fractions modified. However, the more difficult the Higgs
search at the LHC is, the easier the search for other light resonances (like
Z', W', t', exotic fermions) will be.


title: Gamma Ray Burst Neutrinos Probing Quantum Gravity

abstract:
  Very high energy, short wavelength, neutrinos may interact with the
space-time foam predicted by theories of quantum gravity. They would propagate
like light through a crystal lattice and be delayed, with the delay depending
on the energy. This will appear to the observer as a violation of Lorenz
invariance. Back of the envelope calculations imply that observations of
neutrinos produced by gamma ray bursts may reach Planck-scale sensitivity. We
revisit the problem considering two essential complications: the imprecise
timing of the neutrinos associated with their poorly understood production
mechanism in the source and the indirect nature of their energy measurement
made by high energy neutrino telescopes.


title: Friedberg-Lee Symmetry Breaking and Its Prediction for theta_13

abstract:
  We consider an effective Majorana neutrino mass operator with the
Friedberg-Lee symmetry; i.e., it is invariant under the transformation
\nu_\alpha -> \nu_\alpha + z (for \alpha = e, \mu, \tau) with z being a
space-time independent constant element of the Grassmann algebra. We show that
this new flavor symmetry can be broken in such a nontrivial way that the
lightest neutrino remains massless but an experimentally-favored neutrino
mixing pattern is achievable. In particular, we get a novel prediction for the
unknown neutrino mixing angle \theta_13 in terms of two known angles:
\sin\theta_13 = \tan\theta_12 |(1- \tan\theta_23)/ (1+\tan\theta_23)|. The
model can simply be generalized to accommodate CP violation and be combined
with the seesaw mechanism.


title: Charm mixing in the Standard Model and beyond

abstract:
  The motivation most often cited in searches for D0-anti-D0 mixing and
CP-violation in charm system lies with the possibility of observing a signal
from New Physics which dominates that from the Standard Model. We review recent
theoretical predictions and experimental constraints on D0-anti-D0 mixing
parameters, concentrating on possible effects of New Physics.


title: Neutrino Pair Emission from Excited Atoms

abstract:
  We explore a possibility of measuring the magnitude and the Majorana nature
of neutrino masses, by using a novel process of neutrino pair emission from
excited atoms. Except lepton number non-conserving processes, the neutrino pair
($\nu \bar{\nu}$) emission is the unique process to distinguish the Majorana
neutrino from the Dirac neutrino. The small energy difference between atomic
levels makes it easier to measure small neutrino masses as indicated by
neutrino oscillation experiments. The crucial point is how to enhance the rate
of pair emission without enhancing the radiative decay. We have in mind two
particular cases; (1) laser irradiated pair emission from metastable atoms, and
(2) microwave irradiated emission from circular Rydberg states. A new mechanism
of the parametric amplification to enhance the neutrino pair emission is
pointed out when Rydberg atoms are irradiated by microwave, while the radiative
process may be inhibited by the cavity QED effect. A great variety of
measurable neutrino parameters and a variety of experimental methods are
conceivable.


title: Higgs Fields as Vielbeins of Internal Symmetry Space

abstract:
  An earlier suggestion that scalar fields in gauge theory may be introduced as
frame vectors or vielbeins in internal symmetry space, and so endowed with
geometric significance, is here sharpened and refined. Applied to a $u(1)
\times su(2)$ theory this gives exactly the Higgs structure of the standard
electroweak theory. Applied to an $su(3)$ theory, it gives a structure having
much in common with a phenomenological model previously constructed to explain
fermion mixing and mass hierarchy. The difference in physical outcome for the
two theories is here traced to the difference in structure between the two
symmetry groups.


title: A Model Behind the Standard Model

abstract:
  In spite of its many successes, the Standard Model makes many empirical
assumptions in the Higgs and fermion sectors for which a deeper theoretical
basis is sought. Starting from the usual gauge symmetry $u(1) \times su(2)
\times su(3)$ plus the 3 assumptions: (A) scalar fields as vielbeins in
internal symmetry space \cite{framevec}, (B) the ``confinement picture'' of
symmetry breaking \cite{tHooft,Banovici}, (C) generations as ``dual'' to colour
\cite{genmixdsm}, we are led to a scheme which offers: (I) a geometrical
significance to scalar fields, (II) a theoretical criterion on what scalar
fields are to be introduced, (III) a partial explanation of why $su(2)$ appears
broken while $su(3)$ confines, (IV) baryon-lepton number (B - L) conservation,
(V) the standard electroweak structure, (VI) a 3-valued generation index for
leptons and quarks, and (VII) a dynamical system with all the essential
features of an earlier phenomenological model \cite{genmixdsm} which gave a
good description of the known mass and mixing patterns of quarks and leptons
including neutrino oscillations. There are other implications the consistency
of which with experiment, however, has not yet been systematically explored. A
possible outcome is a whole new branch of particle spectroscopy from $su(2)$
confinement, potentially as rich in details as that of hadrons from colour
confinement, which will be accessible to experiment at high energy.


title: Higher Twist Effects in Photon-Photon Collisions

abstract:
  In this article, we investigate the contribution of the high twist Feynman
diagrams to the large $p_{T}$ single pseudoscalar and vector mesons inclusive
production cross section in two-photon collisions and we present the general
formulae for the high and leading twist differential cross sections. The pion
wave function where two non-trivial Gegenbauer coefficients $a_2$ and $a_4$
have been extracted from the CLEO data, Braun-Filyanov pion wave function, the
asymptotic and the Chernyak-Zhitnitsky wave functions are used in the
calculations. For $\rho$-meson we used Ball-Braun wave function. The results of
all the calculations reveal that the high twist cross sections, the ratio R,
the dependence transverse momentum $p_{T}$ and the rapidity $y$ of meson in
$\Phi_{CLEO}(x,Q^2)$ wave function case is very close to the $\Phi_{asy}(x)$
asymptotic wave function case. It is shown that the high twist contribution to
the cross section depends on the choice of the meson wave functions.


title: Aspects of radiative K^+_e3 decays

abstract:
  We re-investigate the radiative charged kaon decay K+- --> pi0 e+- nu_e gamma
in chiral perturbation theory, merging the chiral expansion with Low's theorem.
We thoroughly analyze the precision of the predicted branching ratio relative
to the non-radiative decay channel. Structure dependent terms and their impact
on differential decay distributions are investigated in detail, and the
possibility to see effects of the chiral anomaly in this decay channel is
emphasized.


title: On some properties of Exotic Baryons in Quasi particle diquark model

abstract:
  The properties of the Theta^{+} and Xi^{--}_{3/2} exotic baryons have been
investigated in the framework of diquark- diquark-antiquark system. A model for
diquark suggested in an analogy with the quasi-particle in a crystal lattice
has been used. The mass of the exotics have been computed. The Decay width of
the Theta^{+} has been estimated to be ~ 11 MeV using effective diquark theory.
The radius of the Xi^{--}_{3/2} has been extracted as 0.94fm using the
experimental value of the frac{\Gamma_{\Theta^{+}}}{\Gamma_{\Xi^{--}_{3/2}}}.
The results obtained are found to be in good agreement with the present
experimental and theoretical suggestions.


title: Leptogenesis and Gravitino Dark Matter

abstract:
  We study implications of thermal leptogenesis for the superparticle mass
spectrum. A consistent picture is obtained if the lightest superparticle is the
gravitino, which can be the dominant component of cold dark matter. In the case
of a long-lived charged scalar lepton as next-to-lightest superparticle,
supergravity can be tested at the next generation of colliders, LHC and ILC.


title:
The vicissitudes of "cannonballs": a response to criticisms by A.M.
  Hillas and a brief review of our claims

abstract:
  A.M. Hillas, in a review of the origins of cosmic rays, has recently
criticized the "cannonball" (CB) model of cosmic rays and gamma-ray bursts. We
respond to this critique and take the occasion to discuss the crucial question
of particle acceleration in the CB model and in the generally accepted models.
We also summarize our claims concerning the CB model.


title: Direct test of time reversal invariance violation in B mesons

abstract:
  In this letter we reinterpret and reanalyze the available data of the B meson
factories showing the existence of direct experimental evidence of time
reversal invariance violation in B mesons. This reinterpretation consists of
using the available observables to define a new observable which, in a model
independent way and without assuming CPT invariance, compares a transition
between a $B^0$ and a here-defined $B_\alpha$-state, with its time reversed
transition. The observable then offers a direct way to probe time reversal
invariance and it is therefore independent of any conclusion obtained from
current experimental information on CP violation and CPT invariance. As far as
the authors are concerned, this is the first direct evidence of time reversal
invariance violation in B mesons and also the first one obtained from decaying
particles whose mean life time difference is negligible.


title: Testing the MSSM with the Mass of the W Boson

abstract:
  We review the currently most accurate evaluation of the W boson mass, M_W, in
the Minimal Supersymmetric Standard Model (MSSM). It consists of a full
one-loop calculation, including the complex phase dependence, all available
MSSM two-loop corrections as well as the full Standard Model result. We analyse
the impact of the phases in the scalar quark sector on M_W and compare the
prediction for M_W based on all known higher-order contributions with the
experimental results.


title: Electroweak Precision Data and Gravitino Dark Matter

abstract:
  Electroweak precision measurements can provide indirect information about the
possible scale of supersymmetry already at the present level of accuracy. We
review present day sensitivities of precision data in mSUGRA-type models with
the gravitino as the lightest supersymmetric particle (LSP). The chi^2 fit is
based on M_W, sin^2 theta_eff, (g-2)_mu, BR(b -> s gamma) and the lightest MSSM
Higgs boson mass, M_h. We find indications for relatively light soft
supersymmetry-breaking masses, offering good prospects for the LHC and the ILC,
and in some cases also for the Tevatron.


title: Higher-Order Corrected Higgs Bosons in FeynHiggs 2.5

abstract:
  Large higher-order corrections enter the Higgs boson sector of the MSSM via
Higgs-boson self-energies. Their effects have to be taken into account for the
correct treatment of loop-corrected Higgs-boson mass eigenstates as external
(on-shell) or internal particles in Feynman diagrams. We review how the loop
corrections, including momentum dependence and imaginary contributions, are
correctly taken into account for external (on-shell) Higgs boson and how
effective couplings can be derived. The proceedures are implemented in the code
FeynHiggs 2.5.


title: The Road Towards the ILC: Higgs, Top/QCD, Loops

abstract:
  The International Linear e+e- Collider (ILC) could go into operation in the
second half of the upcoming decade. Experimental analyses and theory
calculations for the physics at the ILC are currently performed. We review
recent progress, as presented at the LCWS06 in Bangalore, India, in the fields
of Higgs boson physics and top/QCD. Also the area of loop calculations,
necessary to achieve the required theory precision, is included.


title: Vanishing chiral couplings in the large-N_C resonance theory

abstract:
  The construction of a resonance theory involving hadrons requires
implementing the information from higher scales into the couplings of the
effective Lagrangian. We consider the large-Nc chiral resonance theory
incorporating scalars and pseudoscalars, and we find that, by imposing LO
short-distance constraints on form factors of QCD currents constructed within
this theory, the chiral low-energy constants satisfy resonance saturation at
NLO in the 1/Nc expansion.


title: Gluon saturation effects on single spin asymmetries

abstract:
  We consider forward pion production in p p collisions at RHIC energies,which
probes the so-called Extended Geometric Scaling region. Upon inclusion of
small-x effects via an anomalous dimension within the Color Glass Condensate
formalism at leading order in alpha_s, a good description of the cross section
as a function of the transverse momentum of the produced pion is obtained. The
latter is essential for extractions of the Sivers effect from polarized p p
collisions, since it is a sensitive probe of the slope of the cross section.
Hence, the presented approach is well suited to extract the Sivers effect from
single spin asymmetries in forward pion production at high energies.


title: Theta_{13}, Rare Decays and Leptonic CP Violation

abstract:
  We introduce a flavor ${\cal U}(1)$ symmetry \`a la Froggat-Nielsen to
explain the magnitude of the CKM mixing angles as well bilarge mixing in the
neutrino sector. In the framework of GUTs we also estimate the magnitude of the
third leptonic mixing angle $\theta_{13}$. Estimates for rare leptonic decays
such as $\mu \to e \ga $ are also provided. Finally, leptogenesis is exploited
for estimating the magnitude of leptonic CP violation.


title: Dark energy and the hierarchy problem

abstract:
  The well-known hierarchy between the Planck scale (~10^{19}GeV) and the TeV
scale, namely a ratio of ~10^{16} between the two, is coincidentally repeated
in a inverted order between the TeV scale and the dark energy scale at
\~10^{-3}eV implied by the observations. We argue that this is not a numerical
coincidence. The same brane-world setups to address the first hierarchy problem
may also in principle address this second hierarchy issue. Specifically, we
consider supersymmetry in the bulk and its breaking on the brane and resort to
the Casimir energy induced by the bulk graviton-gravitino mass-shift on the
brane as the dark energy. For the ADD model we found that our notion is
sensible only if the number of extra dimension n=2. We extend our study to the
Randall-Sundrum model. Invoking the chirality-flip on the boundaries for
SUSY-breaking, the zero-mode gravitino contribution to the Casimir energy does
give rise to the double hierarchy. Unfortunately since the higher Kaluza-Klein
modes acquire relative mass-shifts at the TeV level, the zero-mode contribution
to Casimir energy is overshadowed.


title:
CP-odd static electromagnetic properties of the W gauge boson and the t
  quark via the anomalous tbW coupling

abstract:
  In the framework of the electroweak chiral Lagrangian, the one-loop induced
effects of the anomalous $tbW$ coupling, which includes both left- and
right-handed complex components, on the static electromagnetic properties of
the $W$ boson and the $t$ quark are studied. The attention is focused mainly on
the CP-violating electromagnetic properties. It is found that the $tbW$
anomalous coupling can induce both CP-violating moments of the $W$ boson,
namely, its electric dipole ($\tilde{\mu}_W$) and magnetic quadrupole
($\tilde{Q}_W$) moments. As far as the $t$ quark is concerned, a potentially
large electric dipole moment $(d_t)$ can arise due to the anomalous $tbW$
coupling. The most recent bounds on the left- and right-handed parameters from
$B$ meson physics lead to the following estimates $\tilde{\mu}_W ~
10^{-23}-10^{-22}$ e-cm and $\tilde{Q}_W~ 10^{-38}-10^{-37}$ e-cm$^2$, which
are 7 and 14 orders of magnitude larger than the standard model (SM)
predictions, whereas $d_t$ may be as large as $10^{-22}$ e-cm, which is about 8
orders of magnitude larger than its SM counterpart.


title: WW Fusion in Higgsless Models

abstract:
  Recently several Higgsless models of electroweak symmetry breaking have been
proposed in which unitarity of $W,Z$ scattering amplitudes is partially
restored through a tower of massive vector gauge bosons. These massive states
are expected to couple mainly to $W$ and $Z$ and should appear as resonances in
$WW$ and $WZ$ fusion at the CERN Large Hadron Collider (LHC). We study the LHC
discovery reach for the first neutral state, $V_1^0$, through the reaction
$W^+W^- \to V_1^0 \to W^+W^- \to e^\pm \mu^\mp + \eslt$. The background from
$t\bar{t}$, $\tau^+\tau^-$ and $W$ pair production is calculated and dual
forward jet tagging as well as a mini-jet veto in the central detector region
are applied. The maximal $P_T(e,\mu)$ distribution is found to have a fat tail
for large $P_T$ that rises above the backgrounds and allows $5\sigma$ discovery
for $V_1^0$ masses above 1 TeV and total integrated luminosity of 300
fb$^{-1}$.


title: Diffraction Patterns in Deeply Virtual Compton Scattering

abstract:
  We report on a calculation to show that the Fourier transform of the Deeply
Virtual Compton Scattering (DVCS) amplitude with respect to the skewness
variable \zeta at fixed invariant momentum transfer squared t gives results
that are analogous to the diffractive scattering of a wave in optics. As a
specific example, we utilize the quantum fluctuations of a fermion state at one
loop in QED to obtain the behavior of the DVCS amplitude for electron-photon
scattering. We then simulate the wavefunctions for a hadron by differentiating
the above LFWFs with respect to M^2 and study the corresponding DVCS amplitudes
in light-front longitudinal space.


title:
Single Transverse Spin Asymmetry for Semi-Inclusive Deep Inelastic
  Scattering

abstract:
  Establishing the twist-3 formalsim for the single transverse spin asymmetry,
we present a complete single-spin-dependent cross section for SIDIS,
$ep^\uparrow\to e\pi X$, associated with the twist-3 distribution for the
transversely polarized nucleon. We emphasize that the consistency condition
from the Ward identities for color gauge invariance is crucial to prove
factorization property of the cross section.


title: A dynamical approach to semi-inclusive B decays

abstract:
  A dynamical approach to semi-inclusive decays based on an effective running
coupling for the strong interactions is described.


title: Prompt photon production with $k_T-$factorization

abstract:
  We consider the prompt photon production at modern high energy colliders in
the framework of $k_T-$factorization approach. We compare our theoretical
predictions with recent experimental data at HERA and Tevatron, empahasizing
the distinction between our theoretical predictions and the results of NLO QCD
calculations. Finally, we extrapolate our predictions to LHC energies.


title: Diquarks in the color--flavor locked phase of dense quark matter

abstract:
  Diquark excitations of dense quark matter are considered in the framework of
the Nambu -- Jona-Lasinio model with three types of massless quarks in the
presense of a quark number chemical potential $\mu$. We investigate the
effective action of meson- and diquark fields at sufficiently high values of
$\mu$, where the color--flavor locked (CFL) phase is realized, and prove the
existence of NG-bosons in the sector of pseudoscalar diquarks. In the sector of
scalar diquarks an additional NG-boson is found, corresponding to the
spontaneous breaking of the U(1)$_B$ baryon symmetry in the CFL phase. Finally,
the existence of massive scalar and pseudoscalar diquark excitations is
demonstrated.


title: Deep Inelastic Pion Electroproduction at Threshold

abstract:
  We consider the cross section of the deep inelastic pion electroproduction on
a proton target at threshold for Q^2 in the region 5-10 GeV^2. The
corresponding amplitudes are described in terms of two form factors which we
calculate using light cone sum rules (LCSR) to leading order in QCD and
including higher twist corrections. Our results suggest a considerable change
from a small Q^2 region that can be treated in the soft pion limit using
current algebra. In particular, we obtain a \pi^0 to \pi^+ producton ratio of
order 1/3 and significant nucleon helicity-flip contributions.


title:
Target dark matter detection rates in models with a well-tempered
  neutralino

abstract:
  In the post-LEP2 era, and in light of recent measurements of the cosmic
abundance of cold dark matter (CDM) in the universe from WMAP, many
supersymmetric models tend to predict 1. an overabundance of CDM and 2.
pessimistically low rates for direct detection of neutralino dark matter.
However, in models with a ``well-tempered neutralino'', where the neutralino
composition is adjusted to give the measured abundance of CDM, the neutralino
is typically of the mixed bino-wino or mixed bino-higgsino state. Along with
the necessary enhancement to neutralino annihilation rates, these models tend
to give elevated direct detection scattering rates compared to predictions from
SUSY models with universal soft breaking terms. We present neutralino direct
detection cross sections from a variety of models containing a well-tempered
neutralino, and find cross section asymptotes with detectable scattering rates.
These asymptotic rates provide targets that various direct CDM detection
experiments should aim for. In contrast, in models where the neutralino mass
rather than its composition is varied to give the WMAP relic density via either
resonance annihilation or co-annihilation, the neutralino remains essentially
bino-like, and direct detection rates may be below the projected reaches of all
proposed experiments.


title: Mixing of scalar tetraquark and quarkonia states in a chiral approach

abstract:
  A chiral invariant Lagrangian describing the tetraquark-quarkonia interaction
is considered at the leading and subleading order in the large-$N_{c}$
expansion. Spontaneous chiral symmetry breaking generates mixing of scalar
tetraquark and quarkonia states and non-vanishing tetraquark condensates. In
particular, the mixing strength is related to the decay strengths of tetraquark
states into pseudoscalar mesons. The results show that scalar states below 1
GeV are mainly four-quark states and the scalars between 1 and 2 GeV
quark-antiquark states, probably mixed with the scalar glueball in the
isoscalar sector.


title: The smallest neutrino mass

abstract:
  We consider models where one Majorana neutrino is massless at tree level
(like the see saw with two right-handed neutrinos), and compute the
contribution to its mass m generated by two-loop quantum corrections. The
result is m \sim 10^{-13}eV in the SM and m \sim 10^{-10} eV (tanBeta/10)^4 in
the MSSM, compatible with the restricted range suggested by Affleck-Dine
baryogenesis.


title: Di-Antiquarks condensation in Color Superconductivity

abstract:
  Some consequences of a classical vector field (chromo-electromagnetic field)
coupled to quarks, which undergo to superfluid and/or superconductive states
with diquark / diantiquark condensation, are investigated. For this, one scalar
field exchange is considered in the lines investigated by Pisarski and Rischke
\cite{PISARSKI-RISCHKE} in the mean field approach. Some effects and possible
consequences are discussed.


title: Symmetry breaking induced by 't Hooft non-abelian flux

abstract:
  We analyze a SU(N) gauge theory on $\mathcal{M}_4 \times T^2$. We find and
catalogue all possible degenerate zero-energy stable configurations in the case
of trivial or non-trivial 't Hooft non abelian flux. We describe the residual
symmetries of each vacua and the 4-dimensional effective spectrum in terms of
continous and discrete parameters, respectively.


title: Goldstone bosons in the color-flavor locked phase

abstract:
  We study pseudoscalar meson excitations in the color-flavor locked phase
within a Nambu-Jona-Lasinio-type model by calculating diquark loops.


title: Hard thermal loops and the entropy of supersymmetric Yang-Mills theories

abstract:
  We apply the previously proposed scheme of approximately self-consistent
hard-thermal-loop resummations in the entropy of high-temperature QCD to N=4
supersymmetric Yang-Mills (SYM) theories and compare with a (uniquely
determined) R[4,4] Pad\'e approximant that interpolates accurately between the
known perturbative result and the next-to-leading order strong-coupling result
obtained from AdS/CFT correspondence. We find good agreement up to couplings
where the entropy has dropped to about 85% of the Stefan-Boltzmann value. This
is precisely the regime which in purely gluonic QCD corresponds to temperatures
above 2.5 times the deconfinement temperature and for which this method of
hard-thermal-loop resummation has given similar good agreement with lattice QCD
results. This suggests that in this regime the entropy of both QCD and N=4 SYM
is dominated by effectively weakly coupled hard-thermal-loop quasiparticle
degrees of freedom. In N=4 SYM, strong-coupling contributions to the
thermodynamic potential take over when the entropy drops below 85% of the
Stefan-Boltzmann value.


title:
Second-order corrections to neutrino two-flavor oscillation parameters
  in the wave packet approach

abstract:
  We report about an analytic study involving the {\em intermediate} wave
packet formalism for quantifying the physically relevant information which
appear in the neutrino two-flavor conversion formula and help us to obtain more
precise limits and ranges for neutrino flavor oscillation. By following the
sequence of analytic approximations where we assume a strictly peaked momentum
distribution and consider the second-order corrections in a power series
expansion of the energy, we point out a {\em residual} time-dependent phase
which, coupled with the {\em spreading/slippage} effects, can subtly modify the
neutrino oscillation parameters and limits. Such second-order effects are
usually ignored in the relativistic wave packet treatment, but they present an
evident dependence on the propagation regime so that some small modifications
to the oscillation pattern, even in the ultra-relativistic limit, can be
quantified. These modifications are implemented in the confront with the
neutrino oscillation parameter range (mass-squared difference $\Delta m^{\2}$
and the mixing-angle $\theta$) where we assume the same wave packet parameters
previously noticed in the literature in a kind of {\em toy model} for some
reactor experiments. Generically speaking, our analysis parallels the recent
experimental purposes which concern with higher precision parameter
measurements. To summarize, we show that the effectiveness of a more accurate
determination of $\Delta m^{\2}$ and $\theta$ depends on the wave packet width
$a$ and on the averaged propagating energy flux $\bar{E}$ which still
correspond to open variables for some classes of experiments. \


title: On in situ Determination of Earth Matter Density in Neutrino Factory

abstract:
  We point out that an accurate in situ determination of the earth matter
density \rho is possible in neutrino factory by placing a detector at the magic
baseline, L = \sqrt{2} \pi / G_{F} N_{e} where N_{e} denotes electron number
density. The accuracy of matter density determination is excellent in a region
of relatively large theta_{13} with fractional uncertainty \delta \rho / \rho
of about 0.43%, 1.3%, and \lsim 3% at 1 sigma CL at sin^2 2theta_{13}=0.1,
10^{-2}, and 3 x 10^{-3}, respectively. At smaller theta_{13} the uncertainty
depends upon the CP phase delta, but it remains small, 3%-7% in more than 3/4
of the entire region of delta at sin^2 2theta_{13} = 10^{-4}. The results would
allow us to solve the problem of obscured CP violation due to the uncertainty
of earth matter density in a wide range of theta_{13} and delta. It may provide
a test for the geophysical model of the earth, or it may serve as a method for
stringent test of the MSW theory of neutrino propagation in matter once an
accurate geophysical estimation of the matter density is available.


title: New Developments in Treacherous Points of Light-Front Dynamics

abstract:
  Light-front dynamics(LFD) plays an important role in hadron phenomenology.
Last few years, however, it has been emphasized that treacherous points such as
zero-mode contributions should be taken into account for successful LFD
applications to hadron phenomenology. We discuss examples of treacherous points
and present new progresses made last few years to handle them correctly.


title: A model of electroweak-scale right-handed neutrino mass

abstract:
  If neutrino masses are realized through the see-saw mechanism, can the
right-handed neutrinos be produced and detected at present and future
colliders? The answer is negative in the most popular see-saw scenarios for the
simple reason that they are too heavy in these models. However, a simple
extension of the Standard Model (SM) particle content, including mirror
fermions, two $SU(2)_L$ triplet and one singlet Higgs fields, leads to a
scenario in which the see-saw mechanism is realized with the Majorana mass
$M_R$ of the right-handed neutrino being of the order of the electroweak scale
or smaller. A custodial SU(2) symmetry arising from the two triplet Higgs
fields ensures that $\rho=1$ at tree level even when their vacuum expectation
values (VEV) which determine the value of $M_R$, can be as large as the
electroweak scale. $M_R$ is found to obey the bound $\frac{M_Z}{2} \leq M_R <
246 GeV $ which makes it accessible experimentally (Tevatron, LHC or ILC)
since, in our scenario, $\nu_R$'s can couple directly to the Standard Model
(SM) gauge bosons.


title:
Traveling waves and the renormalization group improved
  Balitsky-Kovchegov equation

abstract:
  I study the incorporation of renormalization group (RG) improved BFKL kernels
in the Balitsky-Kovchegov (BK) equation which describes parton saturation. The
RG improvement takes into account important parts of the next-to-leading and
higher order logarithmic corrections to the kernel. The traveling wave front
method for analyzing the BK equation is generalized to deal with RG-resummed
kernels, restricting to the interesting case of fixed QCD coupling. The results
show that the higher order corrections suppress the rapid increase of the
saturation scale with increasing rapidity. I also perform a "diffusive"
differential equation approximation, which illustrates that some important
qualitative properties of the kernel change when including RG corrections.


title:
Double spin azimuthal asymmetries A_{LT} and A_{LL} in semi-inclusive
  DIS

abstract:
  Within the LO QCD parton model of SIDIS with unintegrated quark distribution
and fragmentation functions we study the transverse momentum and azimuthal
dependencies of the double spin asymmetries $A_{LT}$ and $A_{LL}$. For later we
include ${\cal O}(k_{\perp}/Q)$ kinematic corrections, which induce an
azimuthal modulation of the asymmetry, analogous to the Cahn effect in
unpolarized SIDIS. We show that a study of these asymmetries allows to extract
the transverse momentum dependence of the unintegrated helicity distribution
function $g_{1L}^q(x,k_\perp)$ and $g_{1T}^q(x,k_\perp)$.
  This report is based on research published in [1] and [2], where predictions
are given for ongoing COMPASS, HERMES and JLab experiments.


title:
Determination of the $\eta$ and $\eta'$ Mixing Angle from the
  Pseudoscalar Transition Form Factors

abstract:
  The possible range of $\eta-\eta'$ mixing angle is determined from the
transition form factors $F_{\eta \gamma}(Q^2)$ and $F_{\eta' \gamma}(Q^2)$ with
the help of the present experimental data. For such purpose, the quark-flavor
mixing scheme is adopted and the pseudoscalar transition form factors are
calculated under the light-cone pQCD framework, where the transverse momentum
corrections and the contributions beyond the leading Fock state have been
carefully taken into consideration. We construct a phenomenological expression
to estimate the contributions to the form factors beyond the leading Fock state
based on their asymptotic behavior at $Q^2\to 0$ and $Q^2\to\infty$. By taking
the quark-flavor mixing scheme, our results lead to $\phi= 38.0^{\circ}\pm
1.0^{\circ}\pm 2.0^{\circ}$, where the first error coming from experimental
uncertainty and the second error coming from the uncertainties of the
wavefunction parameters. The possible intrinsic charm component in $\eta$ and
$\eta'$ is discussed and our present analysis also disfavors a large portion of
intrinsic charm component in $\eta$ and $\eta'$, e.g. $|f^c_{\eta'}|\le 50 {\rm
MeV}$.


title:
Study on $B_s\to D_{sJ}(2317,2460)l\bar{\nu}$ Semileptonic Decays in the
  CQM Model

abstract:
  Assuming $D^*_{sJ}(2317)$ and $D_{sJ}(2460)$ to be the $(0^+,1^+)$ chiral
partners of regular $D_{s}(1968)$ and $D^{*}_{s}(2112)$, we calculate the
semileptonic decays of $B_s$ to $D_s(1968)$, $D^*_s(2112)$, $D_{sJ}^{*}(2317)$,
$D_{sJ}(2460)$ in terms of the Constituent Quark Meson (CQM) model. The large
branching ratios of the semileptonic decays of $B_s$ to $D_{sJ}^{*}(2317)$ and
$D_{sJ}(2460)$ indicate that those two semileptonic decays should be seen in
future experiments.


title:
Determination of fragmentation functions and their uncertainties from e+
  + e- -> h + X data

abstract:
  Fragmentation functions are determined for pions, kaons, and nucleons by a
global analysis of charged-hadron production data in electron-positron
annihilation. The optimum functions are obtained in both leading order (LO) and
next-to-leading order (NLO) of alpha_s. It is important that uncertainties of
the fragmentation functions are estimated in this work by the Hessian method.
We found that the uncertainties are large at small Q^2 and that they are
generally reduced in the NLO in comparison with the LO ones. We supply a code
for calculating the fragmentation functions and their uncertainties for the
pions, kaons, and nucleons at given z and Q^2.