title: On Unique Predictions for Single Spin Azimuthal Asymmetry

abstract:
  Theoretically there are two approaches to predict single spin azimuthal
asymmetries. One is to take transverse momenta of partons into account by using
transverse momentum dependent parton distributions, while another is to take
asymmetries as a twist-3 effect. The nonperturbative effects in these
approaches are parameterized with different matrix elements and predictions can
be different. Recently, gauge invariant definitions of transverse momentum
dependent parton distributions were derived. With these definitions it can be
shown that there are relations between nonperturbative matrix elements in two
approaches. These relations may enable us to unify two approaches and to have
unique predictions for single spin azimuthal asymmetries.In this letter we
derive these relations by using time-reversal symmetry and show that even with
these relations the single spin azimuthal asymmetry in Drell-Yan process is
predicted differently in different approaches.


title:
Search for sterile neutrinos as another research objective of
  ${\theta}_{13}$ experiments at reactors

abstract:
  Searches for mass-3 component in the electron neutrino flavor state
$\sin{\theta}_{13}$ and for sterile neutrinos can be carried out in the same
small mixing angle antineutrino oscillation experiment at a reactor. As an
example we consider a layout, which involves several movable antineutrino
spectrometers, stationed at distances 1700 m $-$ 50 m from a reactor. The
experiment can scan neutrino mass parameter interval $\sim$(0.5$-$0.001)
eV$^{2}$ and have there typical sensitivity to $\sin^{2}2{\theta}$ at a level
of 0.015$-$0.02. The signature for sterile neutrino is disappearance observed
at mass parameter ${\Delta}m^{2}_{new}$ different from ${\Delta}m^{2}_{atm}
\approx 2\times 10^{-3}$ eV$^{2}$. In any case existing constraints both on
$\sin{\theta}_{13}$ and on sterile neutrinos can considerably be improved.


title: The anomalous Higgs-top couplings in the MSSM

abstract:
  The anomalous couplings of the top quark and the Higgs boson has been studied
in an effective theory resulting in the framework of the minimal supersymmetric
extension of the standard model (MSSM) when the heavy fields are integrated
out. Constraints on the parameters of the model from the experimental data on
the ratio $R_b={\Gamma(Z\to b\bar{b})/\Gamma(Z\to hadrons)}$ are derived.


title: Gaugino CP phases and EDMs in the extended gauge mediation SUSY breaking

abstract:
  We study phenomenological aspects of the soft supersymmetry breaking
parameters in a model with the extended gauge mediation supersymmetry breaking.
In this model gaugino masses can be non-universal and as its result physical
CP-phases remain in the gaugino sector even after the R-transformation. These
phases contribute to the electric dipole moment (EDM) of an electron and a
neutron. We show that their experimental bounds can be satisfied even for the
situation such that there exist the order one CP-phases and the masses of
superpartners are of the order of 100 GeV.


title:
Hadron resonance gas and nonperturbative QCD vacuum at finite
  temperature

abstract:
  We study the nonperturbative QCD vacuum with two light quarks at finite
temperature in the framework of hadron resonance gas. Temperature dependence of
the quark and gluon condensates in the confined phase are obtained. We
demonstrate that the quark condensate and one half (chromo-electric component)
of gluon condensate evaporate at the same temperature, which corresponds to the
temperature of quark-hadron phase transition. Critical temperature is T_c~190
MeV when temperature shift of hadron masses is taken into account.


title:
The $\eta^\prime g^* g^{(*)}$ Vertex Function in Perturbative QCD and
  $\eta^\prime$-Meson Mass Effects

abstract:
  The $\eta^\prime g^* g^{(*)}$ effective vertex function (EVF) is calculated
in the QCD hard-scattering approach, taking into account the
$\eta^\prime$-meson mass. We work in the approximation in which only one
non-leading Gegenbauer moment in both the quark-antiquark and gluonic
light-cone distribution amplitude for the $\eta^\prime$-meson is kept. The EVF
with one off-shell gluon is shown to have the form $F_{\eta^\prime g^* g}
(q_1^2, 0, m_{\eta^\prime}^2) = m_{\eta^\prime}^2 H(q_1^2)/(q_1^2 -
m_{\eta^\prime}^2)$, valid for $|q_1^2| > m_{\eta^\prime}^2$. An interpolating
formulae for the EVF in the space-like region of the virtuality $q_1^2$, which
satisfies the QCD-anomaly normalization for on-shell gluons and the
perturbative-QCD result for the gluon virtuality $|q_1^2| \gtrsim 2 GeV^2$, is
also presented.


title: Quasiparticle Description of Hot QCD at Finite Quark Chemical Potential

abstract:
  We study the extension of a phenomenologically successful quasiparticle model
that describes lattice results of the equation of state of the deconfined phase
of QCD for Tc <= T < 4 Tc, to finite quark chemical potential mu. The phase
boundary line Tc(mu), the pressure difference (p(T,mu)-p(T,mu=0))/T^4 and the
quark number density nq(T,mu)/T^3 are calculated and compared to recent lattice
results. Good agreement is found up to quark chemical potentials of order mu =
Tc.


title:
Extracting \gamma from Bd(t) -> D(*)+ D(*)- and Bd -> Ds(*)+ D(*)-
  Decays

abstract:
  We show that the CP phase \gamma can be obtained from measurements of Bd(t)
-> D(*)+ D(*)- and Bd -> Ds(*)+ D(*)-. These decays are related by flavor SU(3)
in the limit where spectator-quark contributions are small. If the
pseudoscalar-pseudoscalar decays Bd(t) -> D+ D- and Bd -> Ds+ D- are used, the
leading-order SU(3)-breaking effect is f_Ds/f_D. The dependence on decay
constants can be removed by using a double ratio involving two helicity states
of the vector-vector decays Bd(t) -> D*+ D*- and Bd -> Ds*+ D*-. In this case
the theoretical error arising from all sources is in the range 5-10%.


title:
A general solution for the quark propagator in two-dimensional covariant
  gauge QCD

abstract:
  We have investigated a closed set of equations for the quark propagator,
which has been obtained earlier within a new, nonperturbative approach to
two-dimencional covariant gauge QCD. It is shown that this theory implies quark
confinement (the quark propagator has no poles, indeed), as well as dynamical
breakdown of chiral symmetry (a chiral symmetry preserving solution is
forbidden). The above-mentioned set of equations can be exactly solved in the
chiral limit. We develop an analytical formalism, the so-called chiral
perturbation theory at the fundamental quark level, which allows one to find
solution for the quark propagator in powers of the light quark masses. Each
correction satisfies the differential equation, which can be formally solved.
We develop also an analytical formalism which alows one to find solution for
the quark propagator in the inverse powers of the heavy quark masses. IT
coincides with free heavy quark propagator up to terms of order $1/m_Q^3$,
where $m_Q$ is the heavy quark mass. So this solution automatically possesses
the heavy quark flavor symmetry up to terms of order $1/m_Q$. At the same time,
we have found a general solution for the heavy quark propagator, which by no
means can be reduced to the free one.


title:
Quark Model Calculations of Spectral Functions of Hadronic Current
  Correlation Functions at Finite Temperature

abstract:
  We calculate spectral functions associated with hadronic current correlation
functions for vector and pseudoscalar currents at finite temperature. We make
use of the Nambu--Jona--Lasinio (NJL) model with temperature-dependent coupling
constants and temperature-dependent momentum cutoff parameters. At low
energies, good fits are obtained for the spectral functions that were extracted
from lattice data by means of the maximum entropy method (MEM). Our model has
two parameters which are used to fix the magnitude and position of the large
peak seen in the spectral functions. With those two parameters fixed, we obtain
a satisfactory fit to the width of the peak. The model then also reproduces the
energy of a second peak seen in the spectral functions. In the case of the
pseudoscalar spectral function, the calculated peak is about 20 percent higher
than that found for the spectral function obtained from the lattice data.
However, it appears that the second peak is a lattice artifact [ P. Petreczky,
private communication ] and our fit to the second peak may not be meaningful.
We conclude that the NJL model may have a broader range of application than
previously considered to be the case, if one allows for significant temperature
dependence of the parameters of the model, as well as rather large values of
the momentum cutoff parameter. Our treatment of temperature-dependent coupling
constants and cutoff parameters is analogous to the procedure introduced by R.
Casalbuoni, R. Gatto, G. Nardulli, and M. Ruggieri, [ Phys. Rev. D \textbf{68},
034024 (2003) ], who make use of the NJL model at finite density and find that
they need to use the density-dependent coupling constants and density
-dependent cutoff parameters to study matter at high density.


title: Unified model for vortex-string network evolution

abstract:
  We describe and numerically test the velocity-dependent one-scale (VOS)
string evolution model, a simple analytic approach describing a string network
with the averaged correlation length and velocity. We show that it accurately
reproduces the large-scale behaviour (in particular the scaling laws) of
numerical simulations of both Goto-Nambu and field theory string networks. We
explicitly demonstrate the relation between the high-energy physics approach
and the damped and non-relativistic limits which are relevant for condensed
matter physics. We also reproduce experimental results in this context and show
that the vortex-string density is significantly reduced by loop production, an
effect not included in the usual `coarse-grained' approach.


title:
Improved $\eta^\prime$-Meson Distribution Amplitudes from Inclusive
  $\Upsilon (1S) \to \eta^\prime X$ Decay

abstract:
  We calculate the $\eta^\prime$-meson energy spectrum in the $\Upsilon (1S)
\to \eta^\prime g g g \to \eta^\prime X$ decay in the leading-order
perturbative QCD in the static-quark limit for the orthoquarkonium.Our
principal result is the extraction of parameters of the $\eta^\prime g^* g$
effective vertex function (EVF) involving a virtual and a real gluon from the
available data on the hard part of the $\eta^\prime$-meson energy spectrum. The
perturbative-QCD based framework provides a good description of the available
CLEO data, allowing one to constrain the lowest Gegenbauer coefficients
$B^{(q)}_2$ and $B^{(g)}_2$ of the quark-antiquark and gluonic distribution
amplitudes of the $\eta^\prime$-meson. The resulting constraints are combined
with the existing ones on these coefficients from an analysis of the
$\eta^\prime - \gamma$ transition form factor and the requirement of positivity
of the EVF, yielding $B^{(q)}_2 (\mu_0^2) = -0.008 \pm 0.054$ and $B^{(g)}_2
(\mu_0^2) = 4.6 \pm 2.5$ for $\mu_0^2 = 2 GeV^2$. This reduces significantly
the current uncertainty on these coefficients.


title: Neutrino Mixing and Lepton Flavor Violation in SUSY-GUT Models

abstract:
  In supersymmetric (SUSY) models the misalignment between fermion and sfermion
families introduces unsuppressed flavor-changing processes. Even if the mass
parameters are chosen to give no flavor violation, family dependent radiative
corrections make this adjustment not stable. In particular, due to the observed
large neutrino mixings and potentially large neutrino Yukawa couplings, sizable
lepton flavor violation (LFV) is expected. After introducing the basic
concepts, the framework and the main assumptions, we report on a recent study
of rare leptonic decays in a class of SUSY-GUT models with three
quasi-degenerate neutrinos. We show that LFV effects are likely visible in
forthcoming experiments.


title: Radion Cosmology in Theories with Universal Extra Dimensions

abstract:
  We discuss cosmology of models with universal extra dimensions, where the
Standard Model degrees of freedom live in a $4+n$ dimensional brane, with $n$
compact and small extra spatial dimensions. In these models, the simplest way
to obtain the conventional 4-dimensional Planck scale starting with a low
string scale is to have also some larger extra dimensions, where only gravity
propagates. In such theories, dimensional reduction generically leads to at
least two radion fields, one associated with the total volume of the extra
spatial dimensions, and the other with the ratio of the sizes of small and
large extra dimensions. In this paper, we discuss the impact of the radion
fields on cosmology. We emphasize various aspects of radion physics such as
radion coupling to the Standard Model fields, bare and dressed radion masses
during inflation, dynamical stabilization of radions during and after
inflation, radion decay life time and its late dominance in thermal history of
the Universe as well as its quantum fluctuations during inflation. We argue
that models where the radion plays the role of an inflaton or the inflaton is a
brane scalar field, run into problems. We then present a successful inflation
model with bulk scalar fields that seems to have all the desired properties. We
also briefly discuss the possibility of radion as a cold dark matter candidate.


title: 1/m_Q order contributions to B \to \pi l \nu decay in HQEFT

abstract:
  Contributions to B\to \pi l \nu decay from 1/m_Q order corrections are
analyzed in the heavy quark effective field theory (HQEFT) of QCD. Transition
wave functions of 1/m_Q order are calculated through light cone sum rule (LCSR)
within the HQEFT framework. The results are compared with those from other
approaches.


title: Fractal Dimension of Proton at Small x

abstract:
  Recently the concept of self similarity in the structure of the proton at
small x has been introduced. We estimate the fractal dimension of proton in
analogy with classical monofractals.


title: The upper limit of the e+e- partial width of X(3872)

abstract:
  The e+e- decay partial width of the recently observed state, X(3872), is
estimated using the ISR data collected at the center of mass energy 4.03 GeV in
e+e- annihilation experiment by BES at BEPC. It is found that the product of
the e+e- partial width and X(3872) --> pi+ pi- J/psi decay branching fraction
is less than 10 eV at 90 % confidence level if the J(PC) of X(3872) is 1(--).
Together with the potential models and other information, we conclude that
X(3872) is very unlikely to be a vector state.


title: Diffusion and local deconfinement in relativistic systems

abstract:
  In relativistic systems at RHIC energies, new deconfinement signatures emerge
and indicate an increasingly clear separation between soft hadronic processes,
and hard partonic interactions in a locally deconfined subsystem. Here the
emphasis is on longitudinal variables, namely, net-baryon rapidity
distributions. As described in a Relativistic Diffusion Model, they change from
bell-shaped at the lower to double-humped at the higher SPS-energy, but do not
reach local statistical equilibrium. At sqrt(sNN) = 200 GeV in the Au-Au
system, however, they are shown to consist of three components. In addition to
the nonequilibrium contributions, a third fraction close to midrapidity
containing Z_eq = 22 protons reaches local statistical equilibrium in a
discontinuous transition. It may be associated with a deconfinement of the
participant partons and thus, serve as a signature for Quark-Gluon Matter
formation.


title:
Neutrino transition magnetic moments and the solar magnetic field on the
  light of the Kamland evidence

abstract:
  We present here a recopilation of recent results about the possibility of
detecting solar electron antineutrinos produced by solar core and convective
magnetic fields. These antineutrinos are predicted by spin-flavor oscillations
at a significant rate even if this mechanism is not the leading solution to the
SNP. Using the recent Kamland results and assuming a concrete model for
antineutrino production by spin-flavor precession in the convective zone based
on chaotic magnetic fields,we obtain bounds on the flux of solar antineutrinos,
on the average conversion neutrino-antineutrino probability and on intrinsic
neutrino magnetic moment. In the most conservative case, $\mu\lsim 2.5\times
10^{-11} \mu_B$ (95% CL). When studying the effects of a core magnetic field,
we find in the weak limit a scaling of the antineutrino probability with
respect to the magnetic field profile in the sense that the same probability
function can be reproduced by any profile with a suitable peak field value. In
this way the solar electron antineutrino spectrum can be unambiguosly
predicted. We use this scaling and the negative results indicated by the
KamLAND experiment to obtain upper bounds on the solar electron antineutrino
flux. We find that, for a wide family of magnetic field profiles in the sun
interior, the antineutrino appearance probability is largely determined by the
magnetic field intensity but not by its shape. Explicit limits on neutrino
transition moments are also obtained consistent with the convective case. These
limits are therefore largerly independent of the detailed structure of the
magnetic field in the solar interior.


title: CKM matrix elements from tree-level decays and b-hadron lifetimes

abstract:
  We give an updated summary of the topics covered in Working Group I of the
2nd Workshop on the CKM Unitarity Triangle, with emphasis on the results
obtained since the 1st CKM Workshop. The topics covered include the measurement
of |V_{ub}|, of |V_{cb}| and of non-perturbative Heavy Quark Expansion
parameters, and the determination of b-hadron lifetimes and lifetime
differences.


title: A More Precise Extraction of |V_{cb}| in HQEFT of QCD

abstract:
  The more precise extraction for the CKM matrix element |V_{cb}| in the heavy
quark effective field theory (HQEFT) of QCD is studied from both exclusive and
inclusive semileptonic B decays. The values of relevant nonperturbative
parameters up to order 1/m^2_Q are estimated consistently in HQEFT of QCD.
Using the most recent experimental data for B decay rates, |V_{cb}| is updated
to be |V_{cb}| = 0.0395 \pm 0.0011_{exp} \pm 0.0019_{th} from B\to D^{\ast} l
\nu decay and |V_{cb}| = 0.0434 \pm 0.0041_{exp} \pm 0.0020_{th} from B\to D l
\nu decay as well as |V_{cb}| = 0.0394 \pm 0.0010_{exp} \pm 0.0014_{th} from
inclusive B\to X_c l \nu decay.


title:
What is this thing called pion distribution amplitude? From theory to
  data

abstract:
  We discuss the status of the pion distribution amplitude (DA) from analyzing
the CLEO experimental data in the context of QCD sum-rule techniques and QCD
perturbation theory at the NLO accuracy. The constraints extracted this way for
the Gegenbauer coefficients a_2 and a_4 exclude \Phi_{CZ} at the 4\sigma level,
while \Phi_{asy} is outside the 3\sigma error ellipse. These data provide
strong support for the type of endpoint-suppressed, double-humped pion DA we
derived via QCD sum rules with nonlocal condensates and favor a value of the
vacuum quark virtuality \lambda_q^2 \simeq 0.4 GeV^2. This pion DA is in
agreement with the E791 data, though these experimental results should be
viewed carefully and further confirmation is necessary for a more accurate
judging of pion DAs from them.


title:
Predictions for top quark spin correlations at the Tevatron and the LHC
  at next-to-leading order in alpha_s

abstract:
  Predictions for angular distributions of top quark decay products that are
sensitive to t tbar spin correlations are presented at next-to-leading order in
alpha_s for the Tevatron and the LHC.


title: Signals of Deconfinement Transition in Nucleus-Nucleus Collisions

abstract:
  We discuss the energy dependence of hadron production in relativistic
nucleus-nucleus collisions. Several `anomalies' in the energy dependence have
been predicted as signals of the deconfinement phase transition and three of
these signals are observed at the CERN SPS indicating that the onset of
deconfinement in Pb+Pb collisions is located at about 30 A GeV.


title: A schematic model for pentaquarks based on diquarks

abstract:
  QCD instantons are known to produce deeply bound diquarks which may be used
as building blocks in the formation of multiquark states, in particular
pentaquarks and dibaryons. We suggest a simple model in which the lowest scalar
diquark (and possibly the tensor one) can be treated as an independent
``body'', with the same color and (approximately) the mass as a constituent
(anti)quark. In this model a new symmetry between states with the same number
of ``bodies'' but different number of quarks appear, in particular the
3-``body'' pentaquarks can be naturally related to decuplet baryons. We
estimate both the masses and widths of such states, and then discuss the
limitations of this model.


title: Exponentiation at partonic threshold for the Drell-Yan cross section

abstract:
  The techniques leading to the resummation of threshold logarithms in the
Drell-Yan cross section and other processes can be used to show that also terms
independent on the Mellin variable N exponentiate. Comparison with explicit
two-loop calculations shows that within this class of terms the exponentiation
of the one-loop result together with the running of the coupling is the
dominant effect at two loops.


title: Nature of branon dark matter

abstract:
  We explore the different possibilities for branons as dark matter candidates.
We consider a general brane-world model, parametrized by the number of extra
dimensions $N$, the fundamental scale of gravity $M_D$, the brane tension scale
$f$ and the branon mass $M$. We analyse the parameter region in which branons
behave as collisionless thermal relics (WIMPs), either cold or hot (warm)
together with less standard scenarios in which they are strongly self
interacting or produced non-thermally.


title: The constant background bag model of the hadron

abstract:
  We have constructed the bag model having a central constant color field. The
motion of the quark is studied in this bag and the Dirac equation is solved for
it. The energy spectrum found has a branching due to the interaction of the
quarks with the color background. It is pointed out that this model can be
applied for taking into account, in the mass spectrum of hadrons, the coupling
of the constituent quarks with the gluon condensation as the interaction with
the color background.


title: Hard Probes in Heavy Ion Collisions at the LHC: Jet Physics

abstract:
  We discuss the importance of high-pT hadron and jet measurements in
nucleus-nucleus collisions at the CERN Large Hadron Collider.


title: Radiative corrections to radiative \pi e 2 decay

abstract:
  The lowest order radiative corrections (RC) to width and spectra of radiative
$\pi e2$ decay are calculated. We take into account virtual photon emission
contribution as well as soft and hard real photon emission one. The result
turns out to be consistent with the standard Drell-Yan picture for the width
and spectra in the leading logarithmical approximation which permits us to
generalize it to all orders of perturbation theory. Explicit expressions of
nonleading contributions are obtained. The contribution of short distance is
found to be in agreement with Standard Model predictions. It is presented as a
general normalization factor. We check the validity of the
Kinoshita-Lee-Nauenberg theorem about cancellation in the total width of the
mass singularities at zero limit of electron mass. We discuss the results of
the previous papers devoted to this problem. The Dalitz plot distribution is
illustrated numerically.


title: Triangle Anomaly and the Muon g-2

abstract:
  Hadronic electroweak corrections to the muon anomalous magnetic moment (g-2)
are reviewed. Emphasis is on clarification of discrepancies among various
published studies. A theorem on non-renormalization of the transversal part of
a correlator of two vector currents and an axial current is reviewed and its
consequences in the form of superconvergent sum rules are discussed.


title:
Single-Spin Polarization Effects and the Determination of Timelike
  Proton Form Factors

abstract:
  We show that measurements of the proton's polarization in electron-positron
annihilation to a proton-antiproton pair $e^+ e^- \to p \bar p$ strongly
discriminate between the analytic forms of models which fit the proton form
factors in the spacelike region. In particular, the single-spin asymmetry
normal to the scattering plane measures the relative phase difference between
the timelike $G_E$ and $G_M$ form factors. The expected proton polarization in
the timelike region is large, of order of several tens of percent.


title: Structure of Cosmological CP Violation via Neutrino Seesaw

abstract:
  The cosmological matter-antimatter asymmetry can originate from CP-violating
interactions of seesaw Majorana neutrinos via leptogenesis in the thermal phase
of the early universe. Having the cosmological CP-phase for leptogenesis
requires at least two right-handed Majorana neutrinos. Using only the low
energy neutrino observables we quantitatively reconstruct a minimal neutrino
seesaw. We establish a general criterion for minimal seesaw schemes in which
the cosmological CP-phase is {\it completely} reconstructed from the low energy
CP-phases measured by neutrino oscillation and neutrinoless double-beta decay
experiments. We reveal and analyze two distinct classes of such minimal schemes
that are shown to be highly predictive. Extension of our reconstruction
formalism to a three-heavy-neutrino seesaw is discussed.


title:
The Beam Single Spin Asymmetry in Semi-inclusive Deep Inelastic
  Scattering

abstract:
  We study the beam single spin asymmetry in semi-inclusive hadron production
in deep inelastic scattering in at order 1/Q. There are two competing
contributions: the leading order transverse momentum dependent parton
distribution $h_1^\perp(x,k_\perp)$ convoluted with chiral-odd fragmentation
function $\hat e(z)$, and the chiral-odd distribution function $e(x)$
convoluted with Collins fragmentation function $H_1^\perp(z,k'_\perp)$. We
estimate this asymmetry and compare with the experimental measurements from
CLAS and HERMES collaborations.


title: $J/\psi$ couplings to open charm mesons from QCD sum rules

abstract:
  We employ QCD sum rules to calculate the $J/\psi$ form factors and coupling
constants with charmed mesons, by studying three-point correlation functions.
In particular we consider the $J/\psi D^*D$ and $J/\psi DD$ vertices. We
determine the momentum dependence of the form factors for kinematical
conditions where J/\psi, D or D^* are off-shell. Extrapolating to the pole of
each one of the so obtained form factors, we determine the coupling constants.
For both couplings our results (within the errors) are compatible with
estimates based on constituent quark model.


title: Spectroscopy of pentaquark states

abstract:
  We construct a complete classification of pentaquark states in terms of the
spin-flavour SU(6) representations. We find that only some definite SU(3)
representations are allowed, singlets, octets, decuplets, anti-decuplets,
27-plets and 35-plets. The latter three contain exotic states, which cannot be
constructed from three quarks only. This complete classification scheme is
general and model independent and is useful both for model builders and
experimentalists. The mass spectrum is obtained from a Gursey-Radicati type
mass formula, whose coefficients have been determined previously by a study of
qqq baryons. The ground state pentaquark which is identified with the recently
observed Theta(1540) state, is predicted to be an isosinglet anti-decuplet
state. Its parity depends on the interplay between the spin-flavour and orbital
contributions to the mass operator.


title: Updated NLL Results for B -> (Xs,Xd) gamma in and beyond the SM

abstract:
  We present general model-independent formulae for the branching ratios and
the direct tagged CP asymmetries for the inclusive B -> Xd gamma and B -> Xs
gamma modes. We also update the corresponding SM predictions.


title: A new analysis of $\pi K$ scattering from Roy and Steiner type equations

abstract:
  With the aim of generating new constraints on the OZI suppressed couplings of
chiral perturbation theory a set of six equations of the Roy and Steiner type
for the $S$- and $P$-waves of the $\pi K$ scattering amplitudes is derived. The
range of validity and the multiplicity of the solutions are discussed. Precise
numerical solutions are obtained in the range $E\lapprox 1$ GeV which make use
as input, for the first time, of the most accurate experimental data available
at $E > 1$ GeV for both $\pi K\to\pi K$ and $\pi\pi\to K\bar{K}$ amplitudes.
Our main result is the determination of a narrow allowed region for the two
S-wave scattering lengths. Present experimental data below 1 GeV are found to
be in generally poor agreement with our results. A set of threshold expansion
parameters, as well as sub-threshold parameters are computed. For the latter,
matching with the SU(3) chiral expansion at NLO is performed.


title: Analysis of CP Violation in Neutralino Decays to Tau Sleptons

abstract:
  In the minimal supersymmetric standard model, tau sleptons $\tilde
\tau_{1,2}$ and neutralinos $\tilde \chi^0_{1,2}$ are expected to be among the
lightest supersymmetric particles that can be produced copiously at future
$e^+e^-$ linear colliders. We analyze $\tilde \tau$ pair and $\tilde \chi_1^0
\tilde \chi_2^0$ production under the assumption $m_{\tilde \chi_1^0} <
m_{\tilde \tau_1} < m_{\tilde \chi_2^0}$, allowing the relevant parameters of
the SUSY Lagrangian to have complex phases. We show that the transverse and
normal components of the polarization vector of the $\tau$ lepton produced in
$\tilde \chi_2^0$ decays offer sensitive probes of these phases.


title: Weakly coupled Higgsless theories and precision electroweak tests

abstract:
  In 5 dimensions the electroweak symmetry can be broken by boundary
conditions, leading to a new type of Higgsless theories. These could in
principle improve on the 4D case by extending the perturbative domain to
energies higher than $4 \pi v$ and by allowing a better fit to the electroweak
precision tests. Nevertheless, it is unlikely that both these improvements can
be achieved, as we show by discussing these problems in an explicit model.


title: Two flavor color superconductivity and compact stars

abstract:
  Baryonic matter at high density and low temperature is a color
superconductor. In real world, this state of matter may naturally appear inside
compact stars. A construction of a hybrid compact star with two flavor color
superconducting quark matter in its interior is presented.


title: Universal light quark mass dependence and heavy-light meson spectroscopy

abstract:
  Clean predictions are presented for all the spin-averaged heavy-light meson
spectroscopies. A new symmetry is identified wherein the energy eigenstates
have a universal dependence on both the light and heavy quark masses. This
universality is used in an efficient analysis of these mesons within the QCD
string/flux tube picture. Unique predictions for all the D, D_s, B, and B_s
type mesons in terms of just four measured quantities.


title: Structure Functions - Status and Prospect

abstract:
  Current status and future prospect of structure function and parton
distribution studies are presented.


title:
New Perspectives for QCD: The Novel Effects of Final-State Interactions
  and Near-Conformal Effective Couplings

abstract:
  The effective QCD charge extracted from $\tau$ decay is remarkably constant
at small momenta, implying the near-conformal behavior of hadronic interactions
at small momentum transfer. The correspondence of large-$N_C$ supergravity
theory in higher-dimensional anti-de Sitter spaces with gauge theory in
physical space-time also has interesting implications for hadron phenomenology
in the conformal limit, such as constituent counting rules for hard exclusive
processes. The utility of light-front quantization and light-front Fock
wavefunctions for analyzing such phenomena and representing the dynamics of QCD
bound states is reviewed. I also discuss the novel effects of initial- and
final-state interactions in hard QCD inclusive processes, including Bjorken
scaling single-spin asymmetries and the leading-twist diffractive and shadowing
contributions to deep inelastic lepton-proton scattering.


title: Study of $B\to D^{**} \pi$ decays

abstract:
  We investigate the production of the novel $P$-wave mesons $D^{*}_{0}$ and
$D^{\prime}_{1} (D_{1})$, identified as $J^{P}=0^+$ and $1^+$, in heavy $B$
meson decays, respectively. With the heavy quark limit, we give our modelling
wave functions for the scalar meson $D^{*}_{0}$. Based on the assumptions of
color transparency and factorization theorem, we estimate the branching ratios
of $B\to D^{*}_{0} \pi$ decays in terms of the obtained wave functions. Some
remarks on $D^{(\prime)}_{1}$ productions are also presented.


title:
Probing neutral top-pion via a flavor-changing process $\gamma\gamma\to
  t\bar{c}\Pi_{t}^{0}$

abstract:
  In the framework of topcolor-assisted-technicolor model(TC2), we study a
flavor-changing neutral top-pion production process $\gamma\gamma\to
t\bar{c}\Pi_{t}^{0}$. The study shows that there exists a resonance effect
which can enhance the cross section up to a few fb even tens fb. For a yearly
luminosity 100 $fb^{-1}$ at future linear colliders, there might be hundreds
even thousands events to be produced. On the other hand, the background of such
flavor-changing process is very clean due to the GIM mechanism in SM . With
such sufficient events and clean background, neutral toppion could be detected
at future linear colliders with high center of energy and luminosity. Our study
provides a possible way to test TC2 model.


title: Simple description of neutrinos in SU(5)

abstract:
  We show that experimental results for the masses and mixing of the neutrinos
can be understood naturally by a simple grand unification model of SU(5)
coupled to N=1 supergravity. No right-handed neutrinos are included. The
left-handed neutrinos receive Majorana masses through the couplings with a
Higgs boson of symmetric $\bf 15$ representation. Introducing $\bar{\bf 45}$
representation is optional for describing the masses of down-type quarks and
charged leptons.


title: The $\kappa$ resonance in s wave $\pi K$ scatterings

abstract:
  A new unitarization approach incorporated with chiral symmetry is established
and applied to study the $\pi K$ elastic scatterings. We demonstrate that the
$\kappa$ resonance exists, if the scattering length parameter in the I=1/2, J=0
channel does not deviate much from its value predicted by chiral perturbation
theory. The mass and width of the $\kappa$ resonance is found to be
$M_\kappa=594\pm 79MeV$, $\Gamma_\kappa=724\pm 332MeV$, obtained by fitting the
LASS data up to 1430MeV. Better determination to the pole parameters is
possible if the chiral predictions on scattering lengths are taken into
account.


title: Succesful renormalization of a QCD-inspired Hamiltonian

abstract:
  The long standing problem of non perturbative renormalization of a gauge
field theoretical Hamiltonian is addressed and explicitly carried out within an
(effective) light-cone Hamiltonian approach to QCD. The procedure is in line
with the conventional ideas: The Hamiltonian is first regulated by suitable
cut-off functions, and subsequently renormalized by suitable counter terms to
make it cut-off independent. Emphasized is the considerable freedom in the
cut-off function which eventually can modify the Coulomb potential of two
charges at sufficiently small distances. The approach provides new physical
insight into nature of gauge theory and the potential energy of QCD and QED
near the origin. The so obtained formalism is applied to physical mesons with a
different flavor of quark and anti-quark. The excitation spectrum of the
$\rho$-meson with its excellent agreement between theory and experiment is
discussed as a pedagogical example.


title:
Spectroscopy of $B_{c}$ meson in a semi-relativistic quark model using
  the shifted large-N expansion method

abstract:
  We calculate the $c\bar{b}$ mass spectrum, the splitting values and some
other properties in the framework of the semi-relativistic equation by applying
the shifted large-N expansion technique. We use seven different central
potentials together with an improved QCD-motivated interquark potentials
calculated to two loops in the modified minimal-subtraction $% (\bar{MS}) $
scheme. The parameters of these potentials are fitted to generate the
semi-relativistic bound states of $ c\bar{b}$ quarkonium system in close
conformity with the experimental and the present available calculated
center-of-gravity (c.o.g.) data. Calculations of the energy bound states are
carried out up to third order. Our results are in excellent fit with the
results of the other works.


title: Effect of pion thermal width on the sigma spectrum

abstract:
  We study the effect of the thermal width of $\pi$ on the spectral function of
$\sigma$. In order to take into account a finite thermal width of $\pi$, we
replace the internal pion mass in the self-energy of $\sigma$ with that of the
complex pole found in a previous paper. The obtained spectral function for
$T\aplg 100 {\rm MeV}$ turns out to possess two broad peaks. Although a sharp
peak at $\sigma\to\pi\pi$ threshold was observed in the one-loop calculation
without the pion thermal width, the peak is shown to be smeared out. We also
search for the poles of the $\sigma$ propagator and analyze the behavior of the
spectral function with these poles.


title: Neutral Fermion Phenomenology With Majorana Spinors

abstract:
  We ask the question whether neutrino physics with momentum space Majorana
spinors, the eigenvectors of the particle--antiparticle conjugation operator,
C=i\gamma_2 K (with K standing for complex conjugation), is different but
physics with Dirac spinors. First we analyze properties of Majorana spinors in
great detail. We show that four dimensional, (4d), Majorana spinors are
unsuited for the construction of a local quantum field because C invariance
does not allow for a covariant propagation in four spinor dimensions, a conduct
due to \gamma_2\gamma_\mu= -\gamma_\mu * \gamma_2. The way out of this dilemma
is finding one more discrete symmetry that respects C invariance and gives rise
to covariant propagators. We construct such a symmetry in observing that the
parity operator, \gamma_0, ``ladders'' between (4d) rest-frame Majorana
spinors, which takes us to eight dimensional spinor spaces. We build up two
types of (8d) spaces-- one with a symmetric- and an other with an
anti-symmetric off diagonal metric and calculate traces of single beta-- and
neutrinoless double beta (0\nu\beta \beta) decays there. We find physics with
(8d) Majorana spinors in the former space to be equivalent to physics with
Dirac spinors in four dimensions. In the latter space we make the rare
observation that in effect of cancellations triggered by the anti-symmetric off
diagonal (8d) metric, the neutrino mass drops from the single beta decay trace
but reappears in 0\nu \beta\beta, without the neutrino being massless in its
free equation-- a curious and in principle experimentally testable signature
for a non-trivial impact of Majorana framework.


title: Modeling quark-hadron duality for relativistic, confined fermions

abstract:
  We discuss a model for the study of quark-hadron duality in inclusive
electron scattering based on solving the Dirac equation numerically for a
scalar confining linear potential and a vector color Coulomb potential. We
qualitatively reproduce the features of quark-hadron duality for all potentials
considered, and discuss similarities and differences to previous models that
simplified the situation by treating either the quarks or all particles as
scalars. We discuss the scaling results for PWIA and FSI, and the approach to
scaling using the analog of the Callan-Gross relation for y-scaling.


title:
FCNC top quark production via anomalous tqV couplings beyond leading
  order

abstract:
  We calculate flavor-changing neutral-current (FCNC) processes involving
top-quark production via anomalous tqV couplings at the Tevatron and HERA
colliders. We cover the FCNC processes p pbar -> t Z, p pbar -> t gamma, p pbar
-> t t, and e p -> e t. We go beyond leading order and include the effects of
soft-gluon corrections through next-to-next-to-leading order. We demonstrate
the stabilisation of the cross section with respect to the variation of QCD
scale, and we investigate the reach of the Tevatron and HERA colliders.


title:
Top quark pair production at a linear collider in the presence of an
  anomalous Wtb coupling

abstract:
  Angular distributions of a mu+ and a b-quark resulting from the decay of a
top quark produced at the e+e- linear collider with an unpolarized and a 100%
longitudinally polarized electron beam are presented. The results of the
standard model are compared with the results obtained in the presence of the
anomalous Wtb coupling.


title: Top Pair Production at Threshold and Effective Theories

abstract:
  I give an introduction to the effective field theory description of top pair
production at threshold in e+e- annihilation. The impact of the summation of
logarithms of the top quark velocity including most recent results at
next-to-next-to-leading logarithmic order is discussed.


title: WG V Conveners' Report: Charm Inputs for CKM Physics

abstract:
  We introduce the contributions to the proceedings of Working Group V. The
main topics were: present and future experiments dedicated to charm physics,
the interplay between high-precision measurements and better control over
theoretical uncertainties, and searches for signals of new physics in the charm
sector. The comparison of Lattice QCD calculations with precise measurements of
charm semi-leptonic and leptonic decays can have a major impact on the
determination of CKM matrix elements from measurements of B meson decays.


title: Eigenvalue Decomposition of Meson Correlators

abstract:
  Euclidean space hadronic correlators are computed in quenched QCD at small
quark mass using truncations of quark propagators which include or exclude low
eigenvalue eigenmodes of the Dirac operator. High modes provide the dominant
contribution to parity averaged correlators, especially at short distances.
Differences of correlators of opposite parity receive most of their
contributions from low modes and are much smaller in size than parity averages
at short distances. The pion propagator in any correlator to which it couples
receives a large contribution from low modes, while the tensor meson correlator
receives a tiny contribution from low eigenmodes.


title:
Consistency equations in Randall-Sundrum cosmology: a test for
  braneworld inflation

abstract:
  In the context of an inflationary Randall-Sundrum Type II braneworld (RS2) we
calculate spectral indices and amplitudes of cosmological scalar and tensor
perturbations, up to second order in slow-roll parameters. Under very simple
assumptions, extrapolating next-order formulae from first-order calculations in
the case of a de Sitter brane, we see that the degeneracy between standard and
braneworld lowest-order consistency equations is broken, thus giving different
signatures of early-universe inflationary expansion. Using the latest results
from WMAP for estimates of cosmological observables, it is shown that future
data and missions can in principle discriminate between standard and braneworld
scenarios.


title: Neutrino Masses, Mixing and New Physics Effects

abstract:
  We introduce a parametrization of the effects of radiative corrections from
new physics on the charged lepton and neutrino mass matrices, studying how
several relevant quantities describing the pattern of neutrino masses and
mixing are affected by these corrections. We find that the ratio omega = sin
theta / tan theta_atm is remarkably stable, even when relatively large
corrections are added to the original mass matrices. It is also found that if
the lightest neutrino has a mass around 0.3 eV, the pattern of masses and
mixings is considerably more stable under perturbations than for a lighter or
heavier spectrum. We explore the consequences of perturbations on some flavor
relations given in the literature. In addition, for a quasi-degenerate neutrino
spectrum it is shown that: (i) starting from a bi-maximal mixing scenario, the
corrections to the mass matrices keep tan theta_atm very close to unity while
they can lower tan theta_sol to its measured value; (ii) beginning from a
scenario with a vanishing Dirac phase, corrections can induce a Dirac phase
large enough to yield CP violation observable in neutrino oscillations.


title: Quark determinant in domain-like gluon fields

abstract:
  We address the computation of the determinant for the Dirac operator
corresponding to a quark propagating in a background gluon field of the
following type: the gauge field is covariantly constant and self-dual inside a
hypersphere and with quark fields satisfying bag-like (chiral-violating)
boundary conditions at the surface of the hypersphere. We find that the parity
odd part of the logarithm of the determinant corresponds to the Abelian
anomaly. However the parity even part also depends on the chiral angle
associated with the boundary. This unexpected dependence is discussed.


title:
Understanding CP phase-dependent measurements at neutrino superbeams in
  terms of bi-rate graphs

abstract:
  We discuss the impact of the true value of the CP phase on the mass
hierarchy, CP violation, and CP precision measurements at neutrino superbeams
and related experiments. We we use a complete statistical experiment simulation
including spectral information, systematics, correlations, and degeneracies to
produce the results. However, since it is very complicated to understand the
results in terms of a complete experiment simulation, we show the corresponding
bi-rate graphs as useful tools to investigate the CP phase-dependencies
qualitatively. Unlike bi-probability graphs, which are based upon oscillation
probabilities, bi-rate graphs use the total event rates of two measurements
simultaneously as a function of the CP phase. Since they allow error bars for
direct quantitative estimates, they can be used for a direct comparison with a
complete statistical experiment simulation. We find that one can describe the
CP phase dependencies of the mentioned measurements at neutrino superbeam
setups, as well as one can understand the role of the $\mathrm{sgn} (\Delta
m_{31}^2)$-degeneracy. As one of the most interesting results, we discuss the
dependence of the CP precision measurement as a function of the CP phase
itself, which leads to ``CP patterns''. It turns out that this dependence is
rather strong, which means that one has to be careful when one is comparing the
CP precisions of different experiments.


title: Extracting Event Dynamics from Event-by-Event Analysis

abstract:
  The problem of eliminating the statistical fluctuations and extracting the
event dynamics from event-by-event analysis is discussed. New moments $G_p$
(for continuous distribution), and $G_{q,p}$ (for anomalous distribution) are
proposed, which are experimentally measurable and can eliminate the Poissonian
type statistical fluctuations to recover the dynamical moments $C_p$ and
$C_{q,p}$. In this way, the dynamical distribution of the event-averaged
transverse momentum $\bar{\pt}$ can be extracted, and the anomalous scaling of
dynamical distribution, if exists, can be recovered, through event-by-event
analysis of experimental data.


title: On a Dynamical Origin for Fermion Generations

abstract:
  We investigate a proposal to address several outstanding shortcomings of the
perturbative Standard Model (SM) of particle physics. The appeal of this
proposal is that these features are a manifestation of the non-perturbative
sector of the SM, requiring no assumptions about new physics beyond presently
attainable experimental limits. In this thesis we apply non-perturbative
techniques to two complementary models: a toy 4-fermion model containing
explicit chiral symmetry-breaking terms and the quenched hypercharge gauge
interaction. Understanding of how fermion mass, generations and CP-violation
might arise is first investigated in the toy 4-fermion model. It is shown that
different scale-invariant 4-fermion operators are present for the three
subspaces of the full theory, enabling self-consistent introduction of three
fermion generations. The second part of the thesis is concerned with dynamical
fermion mass generation in the quenched hypercharge interaction. In particular
we follow the successful procedure developed for QED, developing a 1-loop
renormalisable vertex {\it ansatz} for solution of the fermion self-energy
Dyson-Schwinger equation. We find two mass "gaps", possibly corresponding to
two types of scalar 4-fermion pairing. These "gaps" cannot, however, be
interpreted as physical fermion mass. An alternative possibility, that of a
rearrangement of fermionic degrees of freedom analogous to spin-charge
separation in condensed matter physics, is also briefly outlined.


title: On the Standard Model and Strongly-Correlated Electron Systems

abstract:
  Higlighting certain similarities between the two-dimensional Luttinger liquid
model and the effective fermionic theory obtained from the hypercharge
Lagrangian, we argue the case for a new type of Standard Model extension.


title: The gluon contents of the eta and eta' mesons

abstract:
  It is reported on a leading-twist analysis of the eta - photon and eta' -
photon transition form factors. The analysis allows for an estimate of the
lowest Gegenbauer coefficients of the quark and gluon distribution amplitudes.


title: Scalar Mesons in Lattice QCD

abstract:
  We explore whether "f$_{0}$(600) or $\sigma$" exists as a pole in QCD, by a
full lattice QCD simulation on the $8^{3} \times 16$ lattice using the
plaquette action and Wilson fermions. It is shown that a low-mass $\sigma$ pole
exists owing to the disconnected diagram of the meson propagator. A discussion
is given on the physical content of the $\sigma$.


title: Theoretical Review of CP Violation

abstract:
  The focus of our considerations is the B-meson system, which will provide
stringent tests of the Kobayashi-Maskawa mechanism of CP violation in this
decade. After a classification of the main possible strategies to achieve this
goal, we discuss the status of the B-factory benchmark modes in view of the
current experimental data. We shall then turn to the "El Dorado" for B-decay
studies at hadron colliders, the Bs-meson system, where we will also address
new, theoretically clean strategies to explore CP violation.


title:
Difference of \tilde \epsilon and \epsilon in fitting the parameters of
  CKM matrix

abstract:
  The difference between induced by box diagram value of \tilde \epsilon and
experimentally measured value of \epsilon is estimated. It appeared to be
around 5 - 10 %, depending on the values of hadronic matrix elements. With this
result, the fit of CKM marix parameters within the SM is performed.


title: Progress on Multiple Interactions

abstract:
  We report on the development of a new model for the underlying event in
hadron-hadron collisions. The model includes parton showers for all
interactions, as well as non-trivial flavour, momentum, and colour correlations
between interaction initiators and beam remnant partons.


title: Testing whether muon neutrino flavor mixing is maximal

abstract:
  The small difference between the survival probabilities of muon neutrino and
antineutrino beams, traveling through earth matter in a long baseline
experiment such as MINOS, is shown to be an important measure of any possible
deviation from maximality in the flavor mixing of those states.


title:
Constraining the Unitarity Triangle with B -> K* gamma and B -> rho
  gamma

abstract:
  We discuss the exclusive radiative decays B -> K* gamma and B -> rho gamma in
QCD factorization within the Standard Model. The analysis is based on the
heavy-quark limit of QCD. Our results for these decays are complete to
next-to-leading order in QCD and to leading order in the heavy-quark limit.
Phenomenological implications for branching ratios and isospin breaking effects
are discussed. Special emphasis is placed on constraining the CKM unitarity
triangle from these observables.


title:
Azimuthal single spin asymmetries in SIDIS in the light of chiral
  symmetry breaking

abstract:
  An attempt is made to understand the z-dependence of the azimuthal single
spin asymmetries observed by the HERMES collaboration in terms of chiral models
based on effective quark and Goldstone boson degrees of freedom. The effects of
respectively neglecting and considering Gaussian intrinsic parton transverse
momenta and the Sivers effect are explored. Predictions for the transverse
target polarization experiment at HERMES are presented.


title: Novel Transversity Properties in SIDIS

abstract:
  We consider a rescattering mechanism to calculate a leading twist $T$-odd
pion fragmentation function, a candidate for filtering the transversity
properties of the nucleon. We evaluate the single spin azimuthal asymmetry for
a transversely polarized target in semi-inclusive deep inelastic scattering
(for HERMES kinematics) and the double $T$-odd $\cos2\phi$ asymmetry in this
framework.


title:
The Light and Heavy Scalars in Unitarized Coupled Channel and Lagrangian
  Approaches

abstract:
  Using ideas underlying the flavour-blind "Nijmegen Unitarised Meson Model" we
try to understand on the basis of a system of Schroedinger equations with one
meson-meson and one (spinless) quark-antiquark channel coupled by a simple
delta-shell transition potential the formation of (e.g. scalar) meson-meson
scattering singularities in the complex momentum and energy plane. Surprisingly
we are able to describe without direct meson-meson interaction and without any
need for glueballs the whole known scalar meson spectrum. "Light" scalar mesons
(e.g. f0(600), kappa(800), f0(980), a0(985), D*0(2290), ...) are identified to
belong to the spectrum of the transition potential, while "heavy" scalars (e.g.
f0(1370), K*0(1430), f0(1500), f0(1710), a0(1450), D*0(2621) (?), D*0(2825)
(?), D*sJ(2928) (?), ...) are related to the confinement spectrum. Due to the
particular value of the charm-strange reduced quark mass level-(anti)crossing
in the complex momentum plane occurs which relates the BABAR state Ds(2317) to
the bare groundstate of the confinement spectrum, while the respective
groundstate of the transition potential ends up as D*sJ(2782) (?). We conclude
with a short comment on (our) recent progress in the consistent quantum field
theoretical effective description of resonances within a Lagrangian framework.


title:
Axial U(1) and spontaneous chiral symmetry breaking within a confining
  model of the QCD vacuum

abstract:
  A model for the QCD vacuum based on domain-like background gluon fields has
previously been developed and demonstrated to exhibit confinement of quarks and
strong correlation of the local chirality of quark modes and duality of the
background gluon field. On the boundary of the j-th domain, quark fluctuations
satisfy chirality violating boundary conditions parametrized by a chiral angle
$\alpha_j$ which is treated as a collective variable. The dependence of the
free energy of an ensemble of $N\to\infty$ domains on $\{\alpha_j, j=1... N\}$
is studied. For one massless flavour there are only two degenerate minima
($\alpha_j=0,\pi$ $\forall j$) due to the contribution of the anomaly to the
free energy, which suppresses the continuous U(1) degeneracy. The residual
discrete symmetry is spontaneously broken with a quark condensate of $-(238
{\rm{MeV}})^3.$ For $N_f$ massless flavours a continuous $SU(N_f)_L\times
SU(N_f)_R$ degeneracy appears, while the $U_A(1)$ direction remains suppressed.


title: Physical Renormalization Schemes and Grand Unification

abstract:
  In a physical renormalization scheme, gauge couplings are defined directly in
terms of physical observables. Such effective charges are analytic functions of
physical scales, and thus mass thresholds are treated with their correct
analytic dependence. In particular, particles will contribute to physical
predictions even at energies below their threshold. This is in contrast to
unphysical renormalization schemes such as MS-bar, where mass thresholds are
treated as step functions. In this paper we analyze supersymmetric grand
unification in the context of physical renormalization schemes and find a
number of qualitative differences and improvements in precision over
conventional approaches. The effective charge formalism presented here provides
a template for calculating all mass threshold effects for any given grand
unified theory. These new threshold corrections may be important in making the
measured values of the gauge couplings consistent with unification.


title: Geometrical Scaling due to Critical Behavior Near the Light Cone

abstract:
  At low $x$ a transition from a dilute parton gas to a dense parton liquid
takes place. We derive geometrical scaling for the structure function in deep
inelastic scattering at low $x$ from a diverging correlation length $\xi(x)$ of
Wilson lines near the light cone. QCD (SU(3)) in 2+1 space - time dimensions
near the light cone becomes a critical theory in the limit of $x \to 0$ with a
diverging correlation length $\xi(x) \propto x^{-\frac{1}{2 \lambda_2}}$ where
the exponent $\lambda_2=2.52$ is obtained from the center group Z(3) of SU(3).


title: Light front field theory of quark matter at finite temperature

abstract:
  A light front field theory for finite temperature and density is currently
being developed. It will be used here to describe the transition region from
quark matter to nuclear matter relevant in heavy ion collisions and in the
early universe. The energy regime addressed is extremely challenging, both
theoretically and experimentally. This is because of the confinement of quarks,
the appearance of bound states and correlations, special relativity, and
nonlinear phenomena that lead to a change of the vacuum structure of quantum
chromodynamics. In the region of the phase transition it eventually leads to a
change of the relevant degrees of freedom. We aim at describing this transition
from quarks to hadronic degrees of freedom in a unified microscopic approach.


title:
Complete description of polarization effects in the nonlinear Compton
  scattering. I. Circularly polarized laser photons

abstract:
  We consider emission of a photon by an electron in the field of a strong
laser wave. Polarization effects in this process are important for a number of
physical problems. We discuss a probability of this process for circularly
polarized laser photons and for arbitrary polarization of all other particles.
We obtain the complete set of functions which describe such a probability in a
compact covariant form. Besides, we discuss an application of the obtained
formulas to the problem of electron -> photon conversion at photon-photon and
photon-electron colliders.


title:
Calculable CP-violating Phases in the Minimal Seesaw Model of
  Leptogenesis and Neutrino Mixing

abstract:
  We show that all nontrivial CP-violating phases can be determined in terms of
three lepton flavor mixing angles and the ratio of $\Delta m^2_{\rm sun}$ to
$\Delta m^2_{\rm atm}$ in the minimal seesaw model in which the
Frampton-Glashow-Yanagida (FGY) ansatz is incorporated. This important point
allows us to make very specific predictions for the cosmological baryon number
asymmetry and CP violation in neutrino oscillations. A measurement of the
smallest neutrino mixing angle will sensitively test the FGY ansatz, in
particular in the case that three light neutrinos have a normal mass hierarchy.


title: The handbag mechanism in wide-angle exclusive reactions

abstract:
  The handbag mechanism for wide-angle exclusive scattering reactions is
discussed and compared with other theoretical approaches. Its application to
Compton scattering, meson photoproduction and two-photon annihilations into
pairs of hadrons is reviewed in some detail.


title: First successful renormalization of a QCD-inspired Hamiltonian

abstract:
  The long standing problem of non perturbative renormalization of a gauge
field theoretical Hamiltonian is addressed and explicitly carried out within an
(effective) light-cone Hamiltonian approach to QCD. The procedure is in line
with the conventional ideas: The Hamiltonian is first regulated by suitable
cut-off functions, and subsequently renormalized by suitable counter terms to
make it cut-off independent. The formalism is applied to physical mesons with a
different flavor of quark and anti-quark. The excitation spectrum of the
$\rho$-meson with its excellent agreement between theory and experiment is
discussed as a pedagogical example.


title: Status of lattice calculations of B-meson decays and mixing

abstract:
  The present status of lattice calculations of f_B, B_B and SU(3) flavour
breaking ratios such as f_Bs/f_B is reviewed. Particular attention is devoted
to systematic uncertainties, such as those arising from the lack of simulation
data for dynamical quarks with realistic masses, and the related difficulties
associated with chiral extrapolations. Global averages for decay constants and
mixing parameters are presented (Table 1), and the procedures to obtain them
are discussed in detail.


title: Ds(2317): a P state from the light cone harmonic oscillator model?

abstract:
  We show that the mass of the recently found meson, Ds(2317) could be
reproduced by an effective light cone Hamiltonian model with a harmonic
oscillator potential as confinement -- the light cone harmonic oscillator
model.


title: The Top--Down Interpretation of Ultra--High Energy Cosmic Rays

abstract:
  The origin of Ultra--High Energy ($E \gsim 10^{20}$ eV) Cosmic Rays (UHECR)
remains mysterious. I discuss ``top--down'' models, where UHECR originate from
the decay of very massive, long--lived particles. I summarize the calculation
of the spectrum of decay products, discuss possible problems with this
scenario, and describe ways to test it by searching for very energetic
neutrinos and neutralinos.


title: Differential Equations for the 2-Loop Equal Mass Sunrise

abstract:
  The differential equations for the 2-loop sunrise graph, at equal masses but
arbitrary momentum transfer, are used for the analytic evaluation of the
coefficients of its Laurent-expansion in the continuous dimension $d$.


title:
Planar box diagram for the (N_F = 1) 2-loop QED virtual corrections to
  Bhabha scattering

abstract:
  In this paper we present the master integrals necessary for the analytic
calculation of the box diagrams with one electron loop (N_{F}=1) entering in
the 2-loop (\alpha^3) QED virtual corrections to the Bhabha scattering
amplitude of the electron. We consider on-shell electrons and positrons of
finite mass m, arbitrary squared c.m. energy s, and momentum transfer t; both
UV and soft IR divergences are regulated within the continuous D-dimensional
regularization scheme. After a brief overview of the method employed in the
calculation, we give the results, for s and t in the Euclidean region, in terms
of 1- and 2-dimensional harmonic polylogarithms, of maximum weight 3. The
corresponding results in the physical region can be recovered by analytical
continuation. For completeness, we also provide the analytic expression of the
1-loop scalar box diagram including the first order in (D-4).


title:
Multi-photon corrections to W boson mass determination at hadron
  colliders

abstract:
  The impact of higher-order final-state photonic corrections on the precise
determination of the W-boson mass at the Tevatron and LHC colliders is
evaluated. The W-mass shift from a fit to the transverse mass distribution is
found to be about 10 MeV in the W --> mu nu channel and a few MeV in the W -->
e nu channel. The calculation, which is implemented in the Monte Carlo event
generator HORACE for data analysis, can contribute to reduce the uncertainty
associated to the W mass measurement at present and future hadron collider
experiments.


title:
e+e- -> pi+pi-e+e-: a potential background for sigma(e+e- -> pi+pi-)
  measurement via radiative return method

abstract:
  A Monte Carlo generator (EKHARA) has been constructed to simulate the
reaction e+e- -> pi+pi-e+e- based on initial and final state emission of a e+e-
pair from e+e- -> pi+pi- production diagram.A detailed study of the process, as
a potential background for sigma(e+e- -> pi+pi-) measurement via radiative
return method, is presented for phi- and B- factory energies.


title: Search for TeV-scale bosons in the dimuon channel at the LHC

abstract:
  Extended gauge models and the Randall-Sundrum model with extra-dimension
predict the existence of TeV-mass resonances. The LHC potential for a five
sigma level discovery was investigated as described in this document. Final
states containing large invariant mass di-muons from ${Z}^{\prime}$ and the RS1
graviton were studied. The possibility of discriminating between different
${Z}^{\prime}$ model by measuring the muon forward-backward asymmetry was
investigated. The determination of the spin of the resonance is also discussed.


title: Advances in perturbative thermal field theory

abstract:
  The progress of the last decade in perturbative quantum field theory at high
temperature and density made possible by the use of effective field theories
and hard-thermal/dense-loop resummations in ultrarelativistic gauge theories is
reviewed. The relevant methods are discussed in field theoretical models from
simple scalar theories to non-Abelian gauge theories including gravity. In the
simpler models, the aim is to give a pedagogical account of some of the
relevant problems and their resolution, while in the more complicated but also
more interesting models such as quantum chromodynamics, a summary of the
results obtained so far are given together with references to a few most recent
developments and open problems.


title: Saturation and BFKL dynamics in the HERA data at small x

abstract:
  We show that the HERA data for the inclusive structure function F_2(x,Q^2)
for x < 0.01 and 0.045 < Q^2 < 45 GeV^2 can be well described within the color
dipole picture, with a simple analytic expression for the dipole-proton
scattering amplitude, which is an approximate solution to the non-linear
evolution equations in QCD. For dipole sizes less than the inverse saturation
momentum 1/Q_s(x), the scattering amplitude is the solution to the BFKL
equation in the vicinity of the saturation line. It exhibits geometric scaling
and scaling violations by the diffusion term. For dipole sizes larger than
1/Q_s(x), the scattering amplitude saturates to one. The fit involves three
parameters: the proton radius R, the value x_0 of x at which the saturation
scale Q_s equals 1GeV, and the logarithmic derivative of the saturation
momentum \lambda. The value of \lambda extracted from the fit turns out to be
consistent with a recent calculation using the next-to-leading order BFKL
formalism.


title: Z-scaling from tens of GeV to TeV

abstract:
  The concept of z-scaling reflecting the general features of internal particle
substructure, constituent interaction and mechanism of particle formation at
high-pT is reviewed. Experimental data on inclusive cross sections obtained at
U70, ISR, SpS, RHIC and Tevatron are used in the analysis. The properties of
data z-presentation such as the energy independence, power law and A-dependence
are discussed. The properties of z-scaling are argued to be connected with the
fundamental symmetries such as self-similarity, locality and fractality. The
use of z-scaling to search for new physics phenomena in hadron-hadron and
hadron-nucleus collisions is suggested. RHIC data used in our new analysis
confirm z-scaling in pp collisions. High-pT particle spectra at LHC energies
are predicted. Violation of z-scaling characterized by the change of anomalous
fractal dimension is considered as a new and complementary signature of new
physics phenomena.


title:
The effects of an extra U(1) axial condensate on the radiative decay
  eta' --> gamma gamma at finite temperature

abstract:
  Supported by recent lattice results, we consider a scenario in which a
U(1)-breaking condensate survives across the chiral transition in QCD. This
scenario has important consequences on the pseudoscalar-meson sector, which can
be studied using an effective Lagrangian model. In particular, generalizing the
results obtained in a previous paper (where the zero-temperature case was
considered), we study the effects of this U(1) chiral condensate on the
radiative decay eta' --> gamma gamma at finite temperature.


title:
FSR at leading and next-to-leading order in the radiative return at
  meson factories

abstract:
  The impact of final-state radiation (FSR) on the radiative return method for
the extraction of the e+e- hadronic cross section is discussed in detail.
Possible experimental tests of the model dependence of FSR are proposed for the
pi+pi- hadronic final state. The importance of the (pi+pi-photon) final state
contribution to the muon anomalous magnetic moment is investigated, and a
method based on the radiative return is proposed to extract these contributions
from data.


title: Baryon asymmetry from electroweak tachyonic preheating

abstract:
  We consider a scenario in which the baryon asymmetry was created in the early
universe during a cold electroweak transition. The spinodal instability of the
Higgs field caused by a rapid change of sign of its effective mass-squared
parameter induces tachyonic preheating. We study the development of
Chern-Simons number in this transition by numerical lattice simulations of the
SU(2)-Higgs model with an added effective CP-violating term. A net asymmetry is
produced, and we study its dependence on the size of CP violation and the ratio
of Higgs to W mass.


title: Charmonium polarization in e^+e^- and heavy ion collisions

abstract:
  In e^+e^- annihilation at \sqrt{s}=10.6 GeV Belle Collaboration found, that
J/psi mesons are predominantly produced in association with an extra \bar{c}c
pair. The possible mechanisms of J/psi production are discussed and the
probability of the associate production of \bar{c}c pair is estimated. The
choice between these mechanisms can be done by measuring J/psi polarization. It
is suggested, that in case of heavy ion collisions one may expect remarkable
transverse polarization of produced J/psi, if quark-gluon plasma if formed. The
measurement of asymmetry of e^+e^-(\mu^+\mu^-) angular distribution in J/psi->
e^+e^-(\mu^+\mu^-) decay is a useful tool for detection of quark-gluon plasma
formation in heavy ion collisions.


title:
Solution of Twist-3 Evolution Equation in Double Logarithmic
  Approximation in QCD

abstract:
  The solution of DGLAP evolution equation for the twist-3 gluon operators is
obtained in the Double Logarithmic Approximation of QCD perturbation theory.
The method used for the solution is similar to the reggeon field theory. The
asymptotics of the twist-3 parton correlation function for the small Bjorken
variables $x_B$ is found.


title:
QCD Sum Rules: Intercrossed Relations for the Sigma^0-Lambda Mass
  Splitting

abstract:
  New relations between QCD Borel sum rules for masses of Sigma^0 and Lambda
hyperons are constructed. It is shown that starting from the sum rule for the
Sigma^0 hyperon mass it is straightforward to obtain the corresponding sum rule
for the Lambda hyperon mass and vice versa.
  PACS: 11.30.Hv, 11.55.Hx Keywords: Octet Baryons, Mass sum rules, SU(3)_f
Symmetry


title: Why a long-lived fireball can be compatible with HBT measurements

abstract:
  The common interpretation of HBT data measured at top SPS energies leads to
apparent source lifetimes of 6-8 fm/c and emission duration of approximately
2-3 fm/c. We investigate a scenario with continuous pion emission from a
long-lived (~17 fm/c) thermalized source in order to show that it is not
excluded by the data. Starting from a description of the source's spacetime
expansion based on gross thermodynamical properties of hot matter (which is
able to describe a number of experimental observables), we introduce the pion
emission function with a contribution from continuous emission during the
source's lifetime and another contribution from the final breakup and proceed
by calculating the HBT parameters R_out and R_side. The results are compared
with experimental data measured at SPS for 158 AGeV central Pb-Pb collisions.
We achieve agreement with data, provided that some minor modifications of the
fireball evolution scenario are made and find that the parameter R_out is not
sensitive to the fireball lifetime, but only to the duration of the final
breakup, in spite of the fact that emission takes place throughout the whole
lifetime. We explicitly demonstrate that those findings do not alter previous
results obtained within this model.


title: Quark Spin Properties at High x

abstract:
  A general three quark bound state satisfying the Pauli principle, and
conserving angular momentum and isospin, is used to investigate the spin
structure of nucleons at high $x$. It is shown if {$F_{1n}/F_{1p}$$\to$1/4},
then both $A_{1p}$ and $A_{1n}$, as well as quark spin distribution $\Delta
u/u$, will approach 1 as $x$$\to$1 in polarized deep inelastic scattering. The
spin distribution $\Delta d/d$ does not approach 1, but is bound by the limits
$-{1/3}\le\Delta d/d\le 0$ for any $x$.


title: Generalized factorial moments

abstract:
  It is shown that the method of eliminating the statistical fluctuations from
event-by-event analysis proposed recently by Fu and Liu can be rewritten in a
compact form involving the generalized factorial moments.


title: Varying alpha, mass generation and extra dimensions

abstract:
  We consider variation of coupling strengths and mass ratios in and beyond the
Standard Model, in the light of various mechanisms of mass generation. In
four-dimensional unified models, variations in charged particle thresholds,
light quark masses and the electron mass can completely alter the (testable)
relation between Delta ln alpha and Delta ln mu, where mu equiv m_p/m_e. In
extra-dimensional models where a compactification scale below the fundamental
scale is varying, definite predictions may result even without unification; we
examine some models with Scherk-Schwarz supersymmetry-breaking.

categories: hep-ph astro-ph gr-qc hep-th physics.atom-ph


title: Study the exotic $\Theta^+$ with polarized photon beams

abstract:
  We carry out an analysis of the pentaquark $\Theta^+$ photoproduction with
polarized photon beams. Kinematical and dynamical aspects are examined for the
purpose of determining $\Theta^+$'s spin and parity. It shows that the
polarized photon beam asymmetry in association with certain dynamical
properties of the production mechanism would provide further information on its
quantum numbers. Facilities at SPring-8, JLab, ELSA, and ESRF will have access
to them.


title: Isospin Breaking in K -> Pi Pi Decays

abstract:
  We perform a complete analysis of isospin breaking in K -> Pi Pi amplitudes
in chiral perturbation theory, including both strong isospin violation and
electromagnetic corrections to next-to-leading order in the low-energy
expansion. The unknown chiral couplings are estimated at leading order in the
1/N_c expansion. We study the impact of isospin breaking on CP conserving
amplitudes and rescattering phases. In particular, we extract the effective
couplings g_8 and g_27 from a fit to K -> Pi Pi branching ratios, finding small
deviations from the isospin-limit case. The ratio Re(A_0)/Re(A_2) measuring the
Delta I=1/2 enhancement is found to decrese from 22.1 +/- 0.1 in the isospin
limit to 20.3 +/- 0.5 in the presence of isospin breaking. We also analyse the
effect of isospin violation on the CP violation parameter epsilon-prime,
finding a destructive interference between three different sources of isospin
violation. Within the uncertainties of large-N_c estimates for the low-energy
constants, the isospin violating correction for epsilon-prime is below 15%.


title: Bulk fields with brane terms

abstract:
  In theories with branes, bulk fields get in general divergent corrections
localized on these defects. Hence, the corresponding brane terms are
renormalized and should be included in the effective theory from the very
beginning. We review the phenomenology associated to brane kinetic terms for
different spins and backgrounds, and point out that renormalization is required
already at the classical level.


title: Physics of Brane Kinetic Terms

abstract:
  Models with extra dimensions may give new effects visible at future
experiments. In these models, bulk fields can develop localized corrections to
their kinetic terms which can modify the phenomenological predictions in a
sizeable way. We review the case in which both gauge bosons and fermions
propagate in the bulk, and discuss the limits on the parameter space arising
from electroweak precision data.


title: Predictions for J/Psi Suppression by Parton Percolation

abstract:
  Parton percolation provides geometric deconfinement in the pre-equilibrium
stage of nuclear collisions. The resulting parton condensate can lead to
charmonium suppression. We formulate a local percolation condition viable for
non-uniform collision environments and show that it correctly reproduces the
suppression observed for S-U and Pb-Pb collisions at the SPS. Using this
formulation, we then determine the behavior of J/Psi suppression for In-In
collisions at the SPS and for Au-Au collisions at RHIC.


title: Fermions on an Interval: Quark and Lepton Masses without a Higgs

abstract:
  We consider fermions on an extra dimensional interval. We find the boundary
conditions at the ends of the interval that are consistent with the variational
principle, and explain which ones arise in various physical circumstances. We
apply these results to higgsless models of electroweak symmetry breaking, where
electroweak symmetry is not broken by a scalar vacuum expectation value, but
rather by the boundary conditions of the gauge fields. We show that it is
possible to find a set of boundary conditions for bulk fermions that would give
a realistic fermion mass spectrum without the presence of a Higgs scalar, and
present some sample fermion mass spectra for the standard model quarks and
leptons as well as their resonances.


title: Likelihood Analysis of the CMSSM Parameter Space

abstract:
  We present a likelihood analysis of the parameter space of the constrained
minimal supersymmetric extension of the Standard Model (CMSSM), in which the
input scalar masses m_0 and fermion masses m_{1/2} are each assumed to be
universal. We include the full experimental likelihood function from the LEP
Higgs search as well as the likelihood from a global precision electroweak fit.
We also include the likelihoods for b to s gamma decay and (optionally) g_mu -
2. For each of these inputs, both the experimental and theoretical errors are
treated. We include the systematic errors stemming from the uncertainties in
m_t and m_b, which are important for delineating the allowed CMSSM parameter
space as well as calculating the relic density of supersymmetric particles. We
assume that these dominate the cold dark matter density, with a density in the
range favoured by WMAP. We display the global likelihood function along cuts in
the (m_{1/2}, m_0) planes for tan beta = 10 and both signs of mu, tan beta =
35, mu < 0 and tan beta = 50, mu > 0, which illustrate the relevance of g_mu -
2 and the uncertainty in m_t. We also display likelihood contours in the
(m_{1/2}, m_0) planes for these values of tan beta. The likelihood function is
generally larger for mu > 0 than for mu < 0, and smaller in the focus-point
region than in the bulk and coannihilation regions, but none of these
possibilities can yet be excluded.


title: Traveling wave fronts and the transition to saturation

abstract:
  We propose a general method to study the solutions to nonlinear QCD evolution
equations, based on a deep analogy with the physics of traveling waves. In
particular, we show that the transition to the saturation regime of high energy
QCD is identical to the formation of the front of a traveling wave. Within this
physical picture, we provide the expressions for the saturation scale and the
gluon density profile as a function of the total rapidity and the transverse
momentum. The application to the Balitsky-Kovchegov equation for both fixed and
running coupling constants confirms the effectiveness of this method.


title:
Open charm production in heavy ion collisions and the Color Glass
  Condensate

abstract:
  We consider the production of open charm in heavy ion collisions in the
framework of the Color Glass Condensate. In the central rapidity region at
RHIC, for the charm quark yield we expect N(coll) (number of collisions)
scaling in the absence of final-state effects. At higher energies, or forward
rapidities at RHIC, the saturation scale exceeds the charm quark mass; we find
that this results in the approximate N(part) (number of participants) scaling
of charm production in AA collisions and N(part)^A scaling in p(d)A collisions,
similarly to the production of high pT gluons discussed earlier. We also show
that the saturation phenomenon makes spectra harder as compared to the naive
parton model approach. We then discuss the energy loss of charm quarks in hot
and cold media and argue that the hardness of the spectrum implies very slow
dependence of the quenching factor on pT.


title:
Covariant Light-Front Approach for s-wave and p-wave Mesons: Its
  Application to Decay Constants and Form Factors

abstract:
  We study the decay constants and form factors of the ground-state s-wave and
low-lying p-wave mesons within a covariant light-front approach. Numerical
results of the form factors for transitions between a heavy pseudoscalar meson
and an s-wave or p-wave meson and their momentum dependence are presented in
detail. In particular, form factors for heavy-to-light and B to D**
transitions, where D** denotes generically a p-wave charmed meson, are compared
with other model calculations. The experimental measurements of the decays B^-
to D** pi^- and B to D D**_s are employed to test the decay constants of D**_s
and the B to D** transition form factors. The heavy quark limit behavior of the
decay constants and form factors is examined and it is found that the
requirement of heavy quark symmetry is satisfied. The universal Isgur-Wise (IW)
functions, one for s-wave to s-wave and two for s-wave to p-wave transitions,
are obtained. The values of IW functions at zero recoil and their slope
parameters can be used to test the Bjorken and Uraltsev sum rules.


title:
Full O(alpha_S) Evaluation for b->s+gamma Transverse Momentum
  Distribution

abstract:
  The full O(alpha_S) transverse momentum distribution for the b -> s+gamma
decay is computed. Results are presented in analytic form. An improved
expression for the coefficient function taking into account subleading
operators is given and an exact expression for the remainder function
associated with the leading operator O_7 is also derived.


title: O(\alpha \alpha_s) relation between pole- and MS-mass of the t-quark

abstract:
  The O(\alpha \alpha_s) contribution to the relationship between the MS- and
the pole-mass of the t-quark propagator within the Standard Model is reviewed.
At the same order also the corrections to the top-Yukawa coupling is discussed.
We furthermore present the exact analytic expression for the gaugeless limit.


title: Meson Spectra from an Effective Light Cone QCD-Inspired Model

abstract:
  I present some recent applications of a light cone QCD-inspired model with
the mass squared operator consisting of a harmonic oscillator potential as
confinement in the meson spectra. The model gives an universal and satisfactory
description of both singlet and triplet states of S-wave mesons. In the present
work P-wave D_s mesons are also investigated. The mass of the recently found
meson, D_s(2317) is reproduced fairly well by this simple model.


title: On two weak CC Delta production models

abstract:
  We perform a detail analysis of two models of neutrino CC Delta production on
free nucleons. First model is a standard one based on nucleon-Delta transition
current with several form-factors. Second model is a starting point for a
construction of Marteau model with sophisticated analytical computations of
nuclear effects. We conclude that both models lead to similar results.


title:
Electroweak radiative corrections to deep-inelastic neutrino scattering
  - implications for NuTeV ?

abstract:
  We calculate the O(alpha) electroweak corrections to charged- and
neutral-current deep-inelastic neutrino scattering off an isoscalar target. The
full one-loop-corrected cross sections, including hard photonic corrections,
are evaluated and compared to an earlier result which was used in the NuTeV
analysis. In particular, we compare results that differ in input-parameter
scheme, treatment of real photon radiation and factorization scheme. The
associated shifts in the theoretical prediction for the ratio of neutral- and
charged-current cross sections can be larger than the experimental accuracy of
the NuTeV result.


title:
Direct detection of supersymmetric dark matter- Theoretical rates for
  transitions to excited states

abstract:
  The recent WMAP data have confirmed that exotic dark matter together with the
vacuum energy (cosmological constant) dominate in the flat Universe.
Supersymmetry provides a natural dark matter candidate, the lightest
supersymmetric particle (LSP). Thus the direct dark matter detection is central
to particle physics and cosmology. Most of the research on this issue has
hitherto focused on the detection of the recoiling nucleus. In this paper we
study transitions to the excited states, focusing on the first excited state at
50 keV of Iodine A=127. We find that the transition rate to this excited state
is about 10 percent of the transition to the ground state. So, in principle,
the extra signature of the gammai ray following its de-excitation can be
exploited experimentally.


title: Cornering Solar Radiative-Zone Fluctuations with KamLAND and SNO Salt

abstract:
  We update the best constraints on fluctuations in the solar medium deep
within the solar Radiative Zone to include the new SNO-salt solar neutrino
measurements. We find that these new measurements are now sufficiently precise
that neutrino oscillation parameters can be inferred independently of any
assumptions about fluctuation properties. Constraints on fluctuations are also
improved, with amplitudes of 5% now excluded at the 99% confidence level for
correlation lengths in the range of several hundred km. Because they are
sensitive to correlation lengths which are so short, these solar neutrino
results are complementary to constraints coming from helioseismology.


title: New Ideas on SUSY Searches at Future Linear Colliders

abstract:
  Several results obtained within the SUSY group of the ECFA/DESY linear
collider study are presented: (i) a possibility to determine tan beta and the
trilinear couplings A_f via polarisation in sfermion decays, (ii) the impact of
complex MSSM parameters on the third generation sfermion decays, (iii)
determination of CP violation in the complex MSSM via T-odd asymmetries in
neutralino production and decay, and (iv) an analysis of the chargino and
neutralino mass parameters at one-loop level.


title: Spectral Dependence of CMB Polarization and Parity

abstract:
  The polarization of the cosmic microwave background radiation (CMBR) can
serve as a probe for nonstandard parity violating interactions. Many such
interactions are predicted in particle physics models arising from theories
with extra dimensions such as superstring theory. These interactions produce an
optical activity that depends on the space-time nature of the parity violating
field. In particular, it is possible to obtain a frequency-dependent
differential rotation of the polarization axis. The form of the frequency
dependence is sensitive to the time evolution of the parity odd background
field. Thus, one may be able to study a broad class of parity violating
operators through polarization measurements of the CMBR.


title:
Detectability of the Sgr Dwarf Leading Tidal Stream with Auger, EUSO or
  OWL

abstract:
  We point out that if heavy metastable particles composing the dark matter of
our galaxy are responsible for the ultra-high energy cosmic rays (UHECR) then
the leading tidal stream of the Sagittarius dwarf galaxy could be detected
through UHECR. The signal would be an anisotropy in the UHECR flux smaller than
the telltale anisotropy towards the galactic center that would first establish
unstable dark matter as the origin of the UHECR.


title: The Orthopositronium Decay Spectrum using NRQED

abstract:
  The photon spectrum in orthopositronium to 3 gamma decay is computed using
effective field theory methods. For energetic photons, the spectrum agrees with
the Ore-Powell result, but deviates from it when the photon energy is
comparable to the positronium binding energy. The decay spectrum in this region
depends on a positronium structure function, which is computed in this paper.
At still lower energies the photon spectrum is dominated by the parapositronium
resonance contribution. Our results are compatible with Low's theorem on soft
photon emission.


title: Belle J/psi+eta_c anomaly and a very light scalar boson

abstract:
  The large rate of the $J/\psi+\eta_c$ production observed by the Belle
collaboration has posed a serious challenge to our understanding of the
quarkonium. We examine a scenario that there exists a light scalar boson around
5 GeV, with an enhanced coupling solely to the charm quark. Such a scenario
would explain the Belle anomaly. It also predicts a significant increase in
$J/\psi$ plus open charm pair production. An immediate test for the scalar
boson is to look for a peak around 5 GeV in the recoil mass spectrum of
$J/\psi$, because the scalar boson can also be produced in association with the
$J/\psi$. Finally, we also point out that the process $e^+ e^- \to H \gamma$ is
sizable for observation.


title: Bottom Quark Mass Determination from low-n Sum Rules

abstract:
  We study the uncertainties in the MSbar bottom quark mass determination using
relativistic sum rules to O(alpha_S^2). We include charm mass effects and
secondary b bbar production and treat the experimental continuum region more
conservatively than previous analyses. The PDG treatment of the region between
the resonances Upsilon (4S) and Upsilon (5S) is reconsidered. Our final result
reads: m_b(m_b)=(4.20 \pm 0.09) GeV.


title: Supersymmetric Higgs production at the Large Hadron Collider

abstract:
  We review the status of theoretical predictions for the production of neutral
Higgs bosons at the LHC. Special emphasis is put on the role of bottom quarks
in the gluon fusion process and in the associated production of Higgs bosons
with bb-bar pairs.


title: Regularization of a Light-Front Qqq Model

abstract:
  We study the mass of the ground state of Qqq system using differents
regularization schemes of the relativistic integral equation obtnaide with a
flavor independente contact interaction in a QCD-inspired model. We calculated
the masses of the spin 1/2 low-lying states of the $\Lambda^0$, $\Lambda^{+}_c$
and $\Lambda_{b}^{0}$ for differentes values of the regularization cut-off
parameter with a fixed nucleon mass.
  Our results are remarkable agreement with the experimental data.


title: Neutrinos in a spherical box

abstract:
  In the present paper we study some neutrino properties as they may appear in
the low energy neutrinos emitted in triton decay with maximum neutrino energy
of 18.6 keV. The technical challenges to this end can be achieved by building a
very large TPC capable of detecting low energy recoils, down to a a few tenths
of a keV, within the required low background constraints. More specifically We
propose the development of a spherical gaseous TPC of about 10-m in radius and
a 200 Mcurie triton source in the center of curvature. One can list a number of
exciting studies, concerning fundamental physics issues, that could be made
using a large volume TPC and low energy antineutrinos: 1) The oscillation
length involving the small angle of the neutrino mixing matrix, directly
measured in this disappearance experiment, is fully contained inside the
detector. Measuring the counting rate of neutrino-electron elastic scattering
as a function of the distance of the source will give a precise and unambiguous
measurement of the oscillation parameters free of systematic errors. In fact
first estimates show that even with a year's data taking a sensitivity of a few
percent for the measurement of the above angle will be achieved. 2) The low
energy detection threshold offers a unique sensitivity for the neutrino
magnetic moment which is about two orders of magnitude beyond the current
experimental limit. 3) Scattering at such low neutrino energies has never been
studied and any departure from the expected behavior may be an indication of
new physics beyond the standard model. In this work we mainly focus on the
various theoretical issues involved including a precise determination of the
Weinberg angle at very low momentum transfer.


title: Weak decay constant of pseudscalar meson in a QCD-inspired model

abstract:
  We show that a linear scaling between the weak decay constants of
pseudoscalar and the vector mesons masses is supported by the available
experimental data. The decay constant scale as $f_m/f_{pi}=M_V/M_{\rho}$ (f_m
is decay constant and M_V vector meson ground state mass). This simple form is
justified within a renormalized light-front QCD-inpired model for
quark-antiquark bound states.


title:
The restriction on the strong coupling constant in the IR region from
  the 1D-1P splitting in bottomonium

abstract:
  The $b\bar b$ spectrum is calculated with the use of a relativistic
Hamiltonian where the gluon-exchange between a quark and an antiquark is taken
as in background perturbation theory. We observed that the splittings
$\Delta_1= \Upsilon({\rm 1D})-\chi_b({\rm 1P})$ and other splittings are very
sensitive to the QCD constant $\Lambda_V(n_f)$ which occurs in the Vector
scheme, and good agreement with the experimental data is obtained for
$\Lambda_V(2$-loop, $n_f=5)= 325\pm 10$ MeV which corresponds to the
conventional $\Lambda_{\bar{MS}} (2-$loop, $n_f=5)= 238\pm 7$ MeV,
$\alpha_s(2-$loop, $M_Z)=0.1189\pm 0.0005,$ and a large freezing value of the
background coupling: $\alpha_{\rm crit} (2$-loop, $q^2=0)=\alpha_{\rm crit}
(2$-loop, $r\to \infty)=0.58\pm 0.02$. If the asymptotic freedom behavior of
the coupling is neglected and an effective freezing coupling $\alpha_{\rm
static}=const$ is introduced, as in the Cornell potential, then precise
agreement with $\Delta_1({\rm exp})$ and $\Delta_2({\rm exp})$ can be reached
for the rather large value $\alpha_{\rm static} =0.43\pm 0.02$. We predict a
value for the mass M(2D) = 10451\pm2 MeV.


title: The heavy-quark pole masses in the Hamiltonian approach

abstract:
  From the fact that the nonperturbative self-energy contribution $C_{\rm SE}$
to the heavy meson mass is small: $C_{\rm SE}(b\bar{b})=0$; $C_{\rm
SE}(c\bar{c})\cong -40$ MeV \cite{ref.01}, strong restrictions on the pole
masses $m_b$ and $m_c$ are obtained. The analysis of the $b\bar{b}$ and the
$c\bar{c}$ spectra with the use of relativistic (string) Hamiltonian gives
$m_b$(2-loop)$=4.78\pm 0.05$ GeV and $m_c$(2-loop)$=1.39 \pm 0.06$ GeV which
correspond to the $\bar{\rm MS}$ running mass $\bar{m}_b(\bar{m}_b)=4.19\pm
0.04$ GeV and $\bar{m}_c(\bar{m}_c)=1.10\pm 0.05$ GeV. The masses $\omega_c$
and $\omega_b$, which define the heavy quarkonia spin structure, are shown to
be by $\sim 200$ MeV larger than the pole ones.


title:
Direct CP violation and new physics effects in the decay mode B^+ -> phi
  K^+

abstract:
  We study the direct CP violation effect in the decay mode $B^+ \to \phi K^+$.
This decay mode is dominated by the loop induced $\bar b \to \bar s s \bar s$
penguin diagram with a tiny contribution from annihilation diagram. Therefore,
the standard model expectation of direct CP violation is negligibly small.
Using QCD factorization approach we find the CP asymmetry in the standard model
to be at percent level. We consider then two scenarios beyond the standard
model, the model with an extra vector like down quark (VLDQ) and the R-parity
violating supersymmetric model (RPV) and show that the direct CP violating
asymmetry in $B^+ \to \phi K^+ $ could be as large as ~85% (70%) in VLDQ (RPV)
model.


title: CP Test in J/Psi -> gamma phi phi Decay

abstract:
  We propose to test CP symmetry in the decay $\jp\to \gamma \phi\phi$, for
which large data sample exists at BESII, and a data sample of $10^{10}$
$J/\psi$'s will be collected with BESIII and CLEO-C program. We suggest some CP
asymmetries in this decay mode for CP test. Assuming that CP violation is
introduced by the electric- and chromo-dipole moment of charm quark, these CP
asymmetries can be predicted by using valence quark models. Our work shows a
possible way to get information about the electric- and chromo-dipole moment of
charm quark, which is little known. Our results show that with the current data
sample of $J/\psi$, electric- and chromo-dipole moment can be probed at order
of $10^{-14}e cm$. In the near future with a $10^{10}$ data sample, these
moments can be probed at order of $10^{-16}e cm$.


title: Quark Correlations and Single Spin Asymmetries

abstract:
  We analyze the Sivers asymmetry in light-cone gauge. The average transverse
momentum of the quark distribution is related to the correlation between the
quark distribution and the transverse component of the gauge field at $x^-\pm
\infty$. We then use finiteness conditions for the light-cone Hamiltonian to
relate the transverse gauge field at $x^-=\pm \infty$ to the color density
integrated over $x^-$. This result allows us to relate the average transverse
momentum of the active quark to color charge correlations in the transverse
plane.