title: Little Higgs and Custodial SU(2)

abstract:
  In this note we present a little Higgs model that has custodial SU(2) as an
approximate symmetry. This theory is a simple modification of the ``Minimal
Moose'' with SO(5) global symmetries protecting the Higgs mass. This allows for
a simple limit where TeV physics makes small contributions to precision
electroweak observables. The spectrum of particles and their couplings to
Standard Model fields are studied in detail. At low energies this model has two
Higgs doublets and it favours a light Higgs from precision electroweak bounds,
though for different reasons than in the Standard Model. The limit on the
breaking scale, f, is roughly 700 GeV, with a top partner of 2 TeV, W' and B'
of 2.5 TeV, and heavy Higgs partners of 2 TeV. These particles are easily
accessible at hadron colliders.


title:
Transition Form Factors between Pseudoscalar and Vector Mesons in
  Light-Front Dynamics

abstract:
  We study the transition form factors between pseudoscalar and vector mesons
using a covariant fermion field theory model in $(3+1)$ dimensions. Performing
the light-front calculation in the $q^+ =0$ frame in parallel with the
manifestly covariant calculation, we note that the suspected nonvanishing
zero-mode contribution to the light-front current $J^+$ does not exist in our
analysis of transition form factors. We also perform the light-front
calculation in a purely longitudinal $q^+ > 0$ frame and confirm that the form
factors obtained directly from the timelike region are identical to the ones
obtained by the analytic continuation from the spacelike region. Our results
for the $B \to D^* l \nu_l$ decay process satisfy the constraints on the
heavy-to-heavy semileptonic decays imposed by the flavor independence in the
heavy quark limit.


title:
Gerasimov-Drell-Hearn and Burkhardt-Cottingham Sum Rules for Proton,
  Neutron and Deuteron

abstract:
  A description of the generalized Gerasimov-Drell-Hearn sum rules for proton,
neutron and deuteron is suggested. The proton consideration confirms the
earlier conjecture, that the structure function $g_T$ features a smooth
$Q^2-$dependence, while the structure function $g_2$ is changing rapidly, due
to the elastic contribution to the Burkhardt-Cottingham sum rule. The neutron
case features the close connection to the Bjorken sum rule. The deuteron case
reveals the crucial role of photodesintegration channel, resulting in the
strong nuclear correction at very low $Q^2$. The new approximate sum rules for
this channel reflecting the delicate interplay between nucleon and nuclear
structure are suggested.


title: Scalar mesons and the muon anomaly

abstract:
  We evaluate systematically some new contributions of the QCD scalar mesons,
including radiative decay-productions, not considered with a better attention
until now in the evaluation of the hadronic contributions to the muon anomaly.
The sum of the scalar contributions to be added to the existing Standard Model
predictions a_mu^{SM} are estimated in units 10^{-10} to be a^{S}_mu= 1.0(0.6)
[TH based]} and 13(11) [ PDG based], where the errors are dominated by the ones
from the experimental widths of these scalar mesons. PDG based results suggest
that the value of a_mu^{SM} and its errors might have been underestimated in
previous works. The inclusion of these new effects leads to a perfect agreement
(< 1.1\sigma) of the measured value a^{exp}_mu and a_mu^{SM} from tau-decay and
implies a (1.5 ~ 3.3) sigma discrepancy between a^{exp}_mu and a_mu^{SM} from
e^+e^- into hadrons data. More refined unbiased estimates of a_mu^{SM} require
improved measurements of the scalar meson masses and widths. The impact of our
results to a_mu^{SM} is summarized in the conclusions.


title: Some comments on Super-Kamiokande's multi-ring analysis

abstract:
  The super-Kamiokande collaboration have used multi-ring events to
discriminate between the $\nu_\mu --> \nu_\tau$ and $\nu_\mu --> \nu_s$
solutions to the atmospheric neutrino anomaly. We show that the effect of
systematic uncertainties in cross sections are so significant that the
usefulness of multi-ring data to distinguish between these two solutions is
doubtful.


title: Study of Generalized Parton Distributions with CLAS

abstract:
  The program to study the Generalized Parton Distributions in deeply virtual
exclusive processes with CLAS at Jefferson Lab is discussed.


title:
The nonperturbative origin of delta-function singularity in the
  chirally-odd twist-3 distribution function e(x)

abstract:
  We analytically prove that the existence of the delta-function singularity in
the chirally-odd twist-3 distribution $e(x)$ of the nucleon is inseparably
connected with the nonvanishing quark condensate as a signal of the spontaneous
chiral symmetry breaking of the QCD vacuum. This singularity in $e(x)$, which
would be observed as a sizable violation of the 1st moment sum rule, is then
interpreted as giving a very rare case that the nontrivial vacuum structure of
QCD manifests in an observable of a localized QCD excitation, i.e. the nucleon.


title: Kappa-deformed Statistics and the Formation of a Quark-Gluon Plasma

abstract:
  The effect of the non-extensive form of statistical mechanics proposed by
Tsallis on the formation of a quark-gluon plasma (QGP) has been recently
investigated in ref. \cite{1}. The results show that for small deviations
($\approx 10%$) from Boltzmann-Gibbs (BG) statistics in the QGP phase, the
critical temperature for the formation of a QGP does not change substantially
for a large variation of the chemical potential. In the present effort we use
the extensive $\kappa$-deformed statistical mechanics constructed by Kaniadakis
to represent the constituents of the QGP and compare the results with ref. [1].


title:
Quark Number Susceptibility, Thermodynamic Sum Rule, and Hard Thermal
  Loop Approximation

abstract:
  The quark number susceptibility, associated with the conserved quark number
density, is closely related to the baryon and charge fluctuations in the
quark-gluon plasma, which might serve as signature for the quark-gluon plasma
formation in ultrarelativistic heavy-ion collisions. Beside QCD lattice
simulations, the quark number susceptibility has been calculated recently using
a resummed perturbation theory (Hard Thermal Loop resummation). In the present
work we show, based on general arguments, that the computation of this quantity
neglecting Hard Thermal Loop vertices contradicts the Ward identity and
violates the thermodynamic sum rule following from the quark number
conservation. We further show that the Hard Thermal Loop perturbation theory is
consistent with the thermodynamic sum rule.


title: Fermion Generations and Mixing from Dualized Standard Model

abstract:
  We review a possible solution to the fermion generation puzzle based on a
nonabelian generalization of electric--magnetic duality derived some years ago.
This nonabelian duality implies the existence of another SU(3) symmetry dual to
colour, which is necessarily broken when colour is confined and so can play the
role of the ``horizontal'' symmetry for fermion generations. When thus
identified, dual colour then predicts 3 and only 3 fermion generations, besides
suggesting a special Higgs mechanism for breaking the generation symmetry. A
phenomenological model with a Higgs potential and a Yukawa coupling constructed
on these premises is shown to explain immediately all the salient qualitative
features of the fermion mass hierarchy and mixing pattern, excepting for the
moment CP-violation. Calculations already carried out to 1-loop order is shown
to give with only 3 adjustable parameters the following quantities all to
within present experimental error: all 9 CKM matrix elements $|V_{rs}|$ for
quarks, the neutrino oscillation angles or the MNS lepton mixing matrix
elements $|U_{\mu 3}|, |U_{e 3}|$, and the mass ratios $m_c/m_t, m_s/m_b,
m_\mu/m_\tau$. The special feature of this model crucial for deriving the above
results is a fermion mass matrix which changes its orientation (rotates) in
generation space with changing energy scale, a feature which is shown to have
direct empirical support.


title:
The chirally-odd twist-3 distribution function e(x) in the chiral
  quark-soliton model

abstract:
  The chirally-odd twist-3 nucleon distribution e(x) is studied in the large-Nc
limit in the framework of the chiral quark-soliton model at a low normalization
point of about 0.6 GeV. The remarkable result is that in the model e(x)
contains a delta-function-type singularity at x=0. The regular part of e(x) is
found to be sizeable at the low scale of the model and in qualitative agreement
with bag model calculations.


title:
QCD radiative corrections to prompt diphoton production in association
  with a jet at hadron colliders

abstract:
  We compute the next-to-leading order corrections in $\alpha_s$ to prompt
diphoton production in association with a jet at hadron colliders. We use a
next-to-leading order general-purpose partonic Monte Carlo event generator that
allows the computation of a rate differential in the produced photons and
hadrons.


title:
Inclusive Jet Production, Parton Distributions, and the Search for New
  Physics

abstract:
  Jet production at the Tevatron probes some of the smallest distance scales
currently accessible. A gluon distribution that is enhanced at large x compared
to previous determinations provides a better description of the Run 1b jet data
from both CDF and D0. However, considerable uncertainty still remains regarding
the gluon distribution at high x. In this paper, we examine the effects of this
uncertainty, and of the remaining uncertainties in the NLO QCD theory, on jet
cross section comparisons to Run 1b data. We also calculate the range of
contributions still possible from any new physics. Predictions are also made
for the expanded kinematic range expected for the ongoing Run 2 at the Tevatron
and for the LHC.


title:
Exponential Type Complex and non-Hermitian Potentials in PT-Symmetric
  Quantum Mechanics

abstract:
  Using the NU method [A.F.Nikiforov, V.B.Uvarov, Special Functions of
Mathematical Physics, Birkhauser,Basel,1988], we investigated the real
eigenvalues of the complex and/or $PT$- symmetric, non-Hermitian and the
exponential type systems, such as Poschl-Teller and Morse potentials.


title: Dynamical Electroweak Symmetry Breaking

abstract:
  Dynamical symmetry breaking provides a possible solution to the electroweak
hierarchy problem. It requires new strong interactions that are effective at
some high-energy scale. If there is no light Higgs boson, this scale is
constrained to be in the TeV range, and signals of the new interactions can be
observed, directly or indirectly, in collider experiments. Even if no
observable states in the Higgs sector are kinematically accessible, a Linear
Collider will cover the low-energy parameter space that arises in a systematic
model-independent analysis of dynamical electroweak symmetry breaking.


title:
Fermionic and Scalar Corrections for the Abelian Form Factor at Two
  Loops

abstract:
  Two-loop corrections for the form factor in a massive Abelian theory are
evaluated, which result from the insertion of massless fermion or scalar loops
into the massive gauge boson propagator. The result is valid for arbitrary
energies and gauge boson mass. Power-suppressed terms vanish rapidly in the
high energy region where the result is well approximated by a polynomial of
third order in ln(s/M^2). The relative importance of subleading logarithms is
emphasised.


title: Chromofields of Strings and Baryons

abstract:
  We calculate color electric fields of quark/antiquark ($\bar{q}q$) and 3
quark ($qqq$) systems within the chromodielectric model (CDM). We explicitly
evaluate the string tension of flux tubes in the $\bar{q}q$--system and analyze
their profile. To reproduce results of lattice calculations we use a bag
pressure $B = (320 MeV)^4$ from which an effective strong coupling constant
$\alpha_s \approx 0.3$ follows. With these parameters we get a $Y$ shaped
configuration for large $qqq$--systems.


title:
Predictions for the $\gamma \gamma$ total cross-section in the TeV
  region: an update

abstract:
  In this talk we present an update of model predictions for the $\gamma
\gamma$ total cross-section in the TeV region. The update includes preliminary
results for $\gamma \gamma $ cross-sections using the Bloch-Nordsieck model for
the overlap function of the partons in the transverse space, use of the CJLK
parametrisation of the photonic parton densities that has recently become
available and extension to the higher $\gamma \gamma$ energies relevant to the
planned CLIC collider.


title: Electroweak phase diagram at finite lepton number density

abstract:
  We study the thermodynamics of the electroweak theory at a finite lepton
number density. The phase diagram of the theory is calculated by relating the
full 4-dimensional theory to a 3-dimensional effective theory which has been
previously solved using nonperturbative methods. It is seen that the critical
temperature increases and the value of the Higgs boson mass at which the first
order phase transition line ends decreases with increasing leptonic chemical
potential.


title: Rho meson properties from combining QCD-based models

abstract:
  Aiming at the calculation of the properties of rho-mesons, non-perturbative
QCD-based methods are discussed concerning their potentials as well as their
short-comings. The latter are overcome by combining these techniques. The
utilized methods are (i) the chiral constituent quark model deduced from the
instanton vacuum model and large-N_c arguments, (ii) chiral perturbation theory
unitarized by the inverse amplitude method and (iii) QCD sum rules. Advantages
of the combination of these methods are especially the absence of un-physical
quark-production thresholds and parameter-free results. Already in the chiral
limit and in leading order in 1/N_c one obtains a reasonable result for the
mass of the rho-meson, namely m_rho = 790 \pm 30 MeV. Using the KSFR relation
the universality of the rho-meson coupling is recovered. The latter is found to
be g = 6.0 \pm 0.3.


title:
Full transverse-momentum spectra of low-mass Drell-Yan pairs at LHC
  energies

abstract:
  The transverse momentum distribution of low-mass Drell-Yan pairs is
calculated in QCD perturbation theory with all-order resummation. We argue that
at LHC energies the results should be reliable for the entire transverse
momentum range. We demonstrate that the transverse momentum distribution of
low-mass Drell-Yan pairs is an advantageous source of constraints on the gluon
distribution and its nuclear dependence.


title:
Leading twist nuclear shadowing: uncertainties, comparison to
  experiments and higher twist effects

abstract:
  Using the leading twist approach to nuclear shadowing, which is based on the
relationship between nuclear shadowing and diffraction on a nucleon, we
calculate next-to-leading order nuclear parton distribution functions (nPDFs)
and structure functions in the region $0.2 > x > 10^{-5}$ and $Q^2 \geq 4$
GeV$^2$.
  The uncertainties of our predictions due the uncertainties of the
experimental input and the theory are quantified. We determine the relative
role of the small ($\sim Q^2$) and large ($\gg Q^2$) diffractive masses in
nuclear shadowing as a function of $x$ and find that the large mass
contribution, which is an analog of the triple Pomeron exchange, becomes
significant only for $x \le 10^{-4}$. Comparing our predictions to the
available fixed-target nuclear DIS data, we argue, based on the current
experimental studies of the leading twist diffraction, that the data at
moderately small $x\sim 0.01$ and $Q^2 \sim 2$ GeV$^2$ could contain
significant higher twist effects hindering the extraction of nPDFs from that
data. Also, we find that the next-to-leading order effects in nuclear shadowing
in the ratio of the nucleus to nucleon structure functions $F_2$ are quite
sizable. Within the same formalism, we also present results for the impact
parameter dependence of nPDFs. We also address the problem of extracting of the
neutron
  $F_{2n}(x,Q^2)$ from the deuteron and proton data. We suggest a simple and
nearly model-independent procedure of correcting for nuclear shadowing effects
using $F_2^A/F_2^D$ ratios.


title: Physics of Electroweak Gauge Boson

abstract:
  The study of gauge bosons is interesting in two respects. The properties of
gauge bosons are modified by higher order effects that are sensitive to mass
scales not directly accessible to experiment. On the other hand interactions
amongst gauge bosons are sensitive to the symmetry structure of the theory
where especially the interactions involving longitudinally polarised bosons
teach us about the mechanism of electroweak symmetry breaking. This article
explains how far a linear collider can increase our knowledge about the
properties of and the interactions amongst gauge bosons.


title:
Nonlinear kT factorization for Forward Dijets in DIS off Nuclei in the
  Saturation Regime

abstract:
  We develop the QCD description of the breakup of photons into forward dijets
in small-x deep inelastic scattering off nuclei in the saturation regime. Based
on the color dipole approach, we derive a multiple scattering expansion for
intranuclear distortions of the jet-jet transverse momentum spectrum. A special
attention is paid to the non-Abelian aspects of the propagation of color
dipoles in a nuclear medium. We report a nonlinear $k_{\perp}$-factorization
formula for the breakup of photons into dijets in terms of the collective
Weizs\"acker-Williams (WW) glue of nuclei as defined in ref.
\cite{Saturation,NSSdijet}. For hard dijets with the transverse momenta above
the saturation scale the azimuthal decorrelation (acoplanarity) momentum is of
the order of the nuclear saturation momentum QA. For minijets with the
transverse momentum below the saturation scale the nonlinear kT-factorization
predicts a complete disappearance of the jet-jet correlation. We comment on a
possible relevance of the nuclear decorrelation of jets to the experimental
data from the STAR-RHIC Collaboration.


title: Evidence for Magnetic Fields in Light Meson Spectra

abstract:
  Mac Gregor's constituent-quark model is reviewed with currently published
data from light meson spectroscopy. It was previously shown that magnetic
sources were responsible for the quantization of several mass-splittings in Mac
Gregor's model. The existence of a 70-MeV quantum was postulated by Mac Gregor
and was shown to fit the Nambu empirical mass formula mn = (n/2)137me, n a
positive integer. It is shown in this paper that the light meson spectra also
fit into the constituent-quark model and are in agreement with the
Russell-Saunders coupling scheme. The existence of magnetic fields is suggested
by the successful accounting of these meson spectra.


title: Probing Supersymmetry with Parity-Violating Electron Scattering

abstract:
  We compute the one-loop supersymmetric (SUSY) contributions to the weak
charges of the electron ($Q_W^e$), proton ($Q_W^p$), and cesium nucleus
($Q_W^{\rm Cs}$) in the Minimal Supersymmetric Standard Model (MSSM). Such
contributions can generate several percent corrections to the corresponding
Standard Model values. The magnitudes of the SUSY loop corrections to $Q_W^e$
and $Q_W^p$ are correlated over nearly all of the MSSM parameter space and
result in an increase in the magnitudes of these weak charges. In contrast, the
effects on $Q_W^{\rm Cs}$ are considerably smaller and are equally likely to
increase or decrease its magnitude. Allowing for R-parity violation can lead to
opposite sign relative shifts in $Q_W^e$ and $Q_W^p$, normalized to the
corresponding Standard Model values. A comparison of $Q_W^p$ and $Q_W^e$
measurements could help distinguish between different SUSY scenarios.


title: Nonstrange hybrid compact stars with color superconducting matter

abstract:
  Realistic nonstrange hybrid compact stars with color superconducting quark
matter in their interior are constructed. It is shown that a positively charged
two-flavor color superconducting phase could naturally appear in the core of a
hybrid star as one of the components of a globally neutral mixed phase. The
negatively charged normal quark phase is the other component of the mixed
phase. The quark core of the star is surrounded by another mixed phase made of
hadronic and normal quark matter. The two mixed phases are separated by a sharp
interface. Finally, the lowest density regions of the star are made of pure
hadronic matter and nuclear crust.


title: Non-perturbative Faddeev-Popov formula and infrared limit of QCD

abstract:
  We show that an exact non-perturbative quantization of continuum gauge theory
is provided by the Faddeev-Popov formula in Landau gauge, $\d(\p \cdot A)
\det[-\p \cdot D(A)] \exp[-S_{\rm YM}(A)]$, restricted to the region where the
Faddeev-Popov operator is positive $-\p \cdot D(A) > 0$ (Gribov region).
Although there are Gribov copies inside this region, they have no influence on
expectation-values. The starting point of the derivation is stochastic
quantization which determines the Euclidean probability distribution $P(A)$ by
a method that is free of the Gribov critique. In the Landau-gauge limit the
support of $P(A)$ shrinks down to the Gribov region with Faddeev-Popov weight.
The cut-off of the resulting functional integral on the boundary of the Gribov
region does not change the {\it form} of the Dyson-Schwinger equations, because
$\det[-\p \cdot D(A)]$ vanishes on the boundary, so there is no boundary
contribution. However this cut-off does provide {\it supplementary conditions}
that govern the choice of solution of the DS equations. In particular the
"horizon condition", though consistent with the perturbative renormalization
group, puts QCD into a non-perturbative phase. The infrared asymptotic limit of
the DS equations of QCD is obtained by neglecting the Yang-Mills action $S_{\rm
YM}$. We sketch the extension to a BRST-invariant formulation. In the infrared
asymptotic limit, the BRST-invariant action becomes BRST-exact, and defines a
topological quantum field theory with an infinite mass gap. Confinement of
quarks is discussed briefly.


title: Dilatonic Inflation and SUSY Breaking in String-inspired Supergravity

abstract:
  The theory of inflation will be investigated as well as supersymmetry
breaking in the context of supergravity, incorporating the target-space duality
and the nonperturbative gaugino condensation in the hidden sector. We found an
inflationary trajectory of a dilaton field and a condensate field which breaks
supersymmetry at once. The model satisfies the slow-roll condition which solves
the eta-problem. When the particle rolls down along the minimized trajectory of
the potential V(S,Y) at a duality invariant point of T=1, we can obtain the
e-fold value \sim 57. And then the cosmological parameters obtained from our
model well match the recent WMAP data combined with other experiments. This
observation suggests one to consider the string-inspired supergravity as a
fundamental theory of the evolution of the universe as well as the particle
theory.


title:
Baryon Number Transfer in Hadron+Nucleus and Nucleus+Nucleus Collisions:
  A Link between Elementary and Complex Interactions

abstract:
  The baryon number transfer is studied in elementary and complex hadronic
interactions at the CERN experiment NA49 at the SPS, at 158 AGeV beam energy
(\sqrt{s}=17.2 GeV). A two component picture is proposed, which builds up the
net proton distribution from a target and a projectile component. Using pion
beam, the projectile component is experimentally determined for p+p and p+A
interactions. A similar stopping behaviour of the projectile component is found
for p+A and A+A interactions. Based on these observations, the baryon transfer
is assumed to provide a common scale of inelasticity in p+p, p+A and A+A
interactions. A model-independent way is proposed to predict the pion
multiplicity in A+A.


title:
Next-to-Leading Order Constituent Quark Structure and Hadronic Structure
  Functions

abstract:
  We calculate the partonic structure of a constituent quark in the
Next-to-Leading Order framework. The structure of any hadron can be obtained
thereafter using a convolution method. Such a procedure is used to generate the
structure function of proton and pion in NLO, neglecting certain corrections to
$\Lambda_{QCD}$. It is shown that while the constituent quark structure is
generated purely perturbatively and accounts for the most part of the hadronic
structure, there is a few percent contributions coming from the nonperturbative
sector in the hadronic structure. This contribution plays the key role in
explaining the SU(2) symmetry breaking of the nucleon sea and the observed
violation of Gottfried sum rule. These effects are calculated. We obtained an
Excellent agreement with the experimental data in a wide range of $x=[10^{-6},
1]$ and $Q^{2}=[0.5, 5000]$ $GeV^{2}$ for the proton structure function. We
have also calculated Pion structure and compared it with the existing data.
Again, the model calculations agree rather well with the data from experiment.


title: Gluino Pair Production in High-Energy Photon Collisions

abstract:
  We study the potential of high-energy photon colliders for the production of
gluino pairs within the Minimal Supersymmetric Standard Model (MSSM). In this
model, the process gamma gamma -> gluino gluino is mediated by quark/squark box
diagrams with enhancements for up-type quarks/squarks from their larger charges
and for third generation squarks from their large mass splittings, generated by
the mixing of left- and right-handed states. Far above threshold and in
scenarios with very heavy squarks, resolved photons can contribute
significantly at tree level. Taking into account the laser photon
backscattering spectrum, electron and laser beam polarization effects, and
current mass exclusion limits, we find that gluino pair production in
high-energy photon collisions should be visible over large regions of the MSSM
parameter space, contrary to what has been found for e^+e^- annihilation. In
addition, the cross section rises rather steeply, so that a gluino mass
determination with a precision of a few GeV should be feasible for a wide range
of post-LEP benchmark points.


title: Screening and Anti-Screening Effects in J/psi Production on Nuclei

abstract:
  The nuclear effects in J/psi hadro- and electroproduction on nuclei are
considered in framework of reggeon approach. It is shown that screening regime
which holds for electroproduction at x_F > 0.7 and for hadroproduction at x_F >
-(0.3-0.4) is changed with anti-screening regime for smaller x_F values.


title: Universality of T-odd effects in single spin and azimuthal asymmetries

abstract:
  We analyze the transverse momentum dependent distribution and fragmentation
functions in space-like and time-like hard processes involving at least two
hadrons, in particular 1-particle inclusive leptoproduction, the Drell-Yan
process and two-particle inclusive hadron production in electron-positron
annihilation. As is well-known, transverse momentum dependence allows for the
appearance of unsuppressed single spin azimuthal asymmetries, such as Sivers
and Collins asymmetries. Recently, Belitsky, Ji and Yuan obtained fully color
gauge invariant expressions for the relevant matrix elements appearing in these
asymmetries at leading order in an expansion in the inverse hard scale. We
rederive these results and extend them to observables at the next order in this
expansion. We observe that at leading order one retains a probability
interpretation, contrary to a claim in the literature and show the direct
relation between the Sivers effect in single spin asymmetries and the
Qiu-Sterman mechanism. We also study fragmentation functions, where the process
dependent gauge link structure of the correlators is not the only source of
T-odd observables and discuss the implications for universality.


title:
Role of baryonic resonances in the dilepton emission in nucleon-nucleon
  collisions

abstract:
  Within an effective Lagrangian model, we present calculations for cross
sections of the dilepton production in proton-proton and proton-neutron
collisions at laboratory kinetic energies in 1-5 GeV range. Production
amplitudes include contributions from the nucleon-nucleon bremsstrahlung as
well as from the mechanism of excitation, propagation, and radiative decay of
Delta(1232) and N*(1520) intermediate baryonic resonances. It is found that the
delta isobar terms dominate the cross sections in the entire considered beam
energy range. Our calculations are able to explain the data of the DLS
collaboration on the dilepton production in proton-proton collisions for beam
energies below 1.3 GeV. However, for incident energies higher than this the
inclusion of contributions from other dilepton sources like Dalitz decay of pi0
and eta mesons, and direct decay of rho and omega mesons is necessary to
describe the data.


title:
Single Squark Production at TeV Scale Photon-Proton and Photon-Electron
  Colliders

abstract:
  We calculate the total cross sections for squark production at future
photon-proton and photon-electron colliders in R-parity violating MSSM. The
Lambda-prime couplings offer several ways of producing single squarks at photon
colliders. The results are discussed and compared with those of the existing
colliders.


title:
CP violation in weak interactions from orbifold reduction: possible
  unification structures

abstract:
  We present a mechanism to generate complex phases from real 4+1 dimensional
couplings in a model of weak interactions through dimensional reduction of a
gauge theory. The orbifolding of a 4+1 dimensional Sp(4) \times U(1) group is
the minimal setup which provides both CP violation and an SU(2) \times U(1)
structure. We show that grand unification requires at least SO(11).


title: Resummed jet rates for $e^+e^-$ annihilation into massive quarks

abstract:
  Expressions for Sudakov form factors for heavy quarks are presented. They are
used to construct resummed jet rates for up to four jets in $e^+e^-$
annihilation. The coefficients of leading and next-to-leading logarithmic
corrections, mandatory for a combination with higher order matrix elements, are
evaluated up to second order in $\alpha_s$.


title: CLEO and E791 data: A smoking gun for the pion distribution amplitude?

abstract:
  The CLEO experimental data on the $\pi\gamma$ transition are analyzed to
next-to-leading order accuracy in QCD perturbation theory using light-cone QCD
sum rules. By processing these data along the lines proposed by Schmedding and
Yakovlev, and recently revised by us, we obtain new constraints for the
Gegenbauer coefficients $a_{2}$ and $a_{4}$, as well as for the inverse moment
$x^{-1}$ of the pion distribution amplitude (DA). The former determine the pion
DA at low momentum scale, the latter is crucial in calculating pion form
factors. From the results of our analysis we conclude that the data confirm the
end-point suppressed shape of the pion DA we previously obtained with QCD sum
rules and nonlocal condensates, while the exclusion of both the asymptotic and
the Chernyak--Zhitnitsky DAs is reinforced at the $3\sigma$- and
$4\sigma$-level, respectively. The reliability of the main results of our
updated CLEO data analysis is demonstrated. Our pion DA is checked against the
di-jets data from the E791 experiment, providing credible evidence for our
results far more broadly.


title:
Density Matrix Kinetic Equation Describing a Passage of Fast Atomic
  Systems Through Matter

abstract:
  The quantum-mechanical consideration of a passage of fast dimesoatoms through
matter is given. A set of quantum-kinetic equations for the density matrix
elements describing their internal state evolution is derived. It is shown that
probabilistic description of internal dynamics of hydrogen-like atoms is
impossible even at sufficiently low energies because of the ``accidental''
degeneracy of their energy levels.


title:
Transverse Activity of Kaons and the Deconfinement Phase Transition in
  Nucleus--Nucleus Collisions

abstract:
  We found that the experimental results on transverse mass spectra of kaons
produced in central Pb+Pb (Au+Au) interactions show an anomalous dependence on
the collision energy. The inverse slopes of the spectra increase with energy in
the low (AGS) and high (RHIC) energy domains, whereas they are constant in the
intermediate (SPS) energy range. We argue that this anomaly is probably caused
by a modification of the equation of state in the transition region between
confined and deconfined matter. This observation may be considered as a new
signal, in addition to the previously reported anomalies in the pion and
strangeness production, of the onset of deconfinement located in the low SPS
energy domain.


title: The Status of Lattice QCD at Finite Temperature

abstract:
  The status of lattice QCD investigations at high temperature is reviewed.
After a short introduction into thermal QCD on the lattice we report on the
present understanding of the phase diagram and the equation of state, in
particular in presence of dynamical quarks. We continue with a discussion of
various screening lengths in the plasma phase including results from
dimensionally reduced QCD. This is followed by summarizing lattice data on
quark number susceptibilities and spectral densities, both of which are of
immediate relevance to the interpretation of heavy ion experiments. A major
section is devoted to presenting simulations of QCD at small yet
phenomenologically important values for the baryon density.


title: Supersymmetric Dark Matter in Light of WMAP

abstract:
  We re-examine the parameter space of the constrained minimal supersymmetric
extension of the Standard Model (CMSSM), taking account of the restricted range
of \Omega_{CDM} h^2 consistent with the WMAP data. This provides a
significantly reduced upper limit on the mass of the lightest supersymmetric
particle LSP: m_\chi < 500 GeV for \tan \beta < 45 and \mu > 0, or \tan \beta <
30 and \mu < 0, thereby improving the prospects for measuring supersymmetry at
the LHC, and increasing the likelihood that a 1-TeV linear e^+ e^- collider
would be able to measure the properties of some supersymmetric particles.


title:
Precision measurements of Higgs-chargino couplings in chargino pair
  production at a muon collider

abstract:
  We study chargino pair production on the heavy Higgs resonances at a muon
collider in the MSSM. At $\sqrt{s} \approx 350$ GeV cross sections up to 2 pb
are reached depending on the supersymmetric scenario and the beam energy
spread. The resonances of the scalar and pseudoscalar Higgs bosons may be
separated for $\tan\beta <8$.
  Our aim is to determine the ratio of the chargino couplings to the heavy
scalar and pseudoscalar Higgs boson independently of the specific chargino
decay characteristics. The precision of the measurement depends on the energy
resolution of the muon collider and on the error in the measurement of the
cross sections of the non-Higgs channels including an irreducible standard
model background. With a high energy resolution the systematic error can be
reduced to the order of a few percent.


title: On the Apparent Convergence of Perturbative QCD at High Temperature

abstract:
  The successive perturbative estimates of the pressure of QCD at high
temperature T show no sign of convergence, unless the coupling constant g is
unrealistically small. Exploiting known results of an effective field theory
which separates hard (order 2 pi T) and soft (order gT) contributions, we
explore the accuracy of simple resummations which at a given loop order
systematically treat hard contributions strictly perturbatively, but soft
contributions without truncations. This turns out to improve significantly the
two-loop and the three-loop results in that both remain below the ideal-gas
value, and the degree of renormalization scale dependence decreases as one goes
from two to three loop order, whereas it increases in the conventional
perturbative results. Including the four-loop logarithms recently obtained by
Kajantie et al., we find that this trend continues and that with a particular
sublogarithmic constant the untruncated four-loop result is close to the
three-loop result, which itself agrees well with available lattice results down
to temperatures of about 2.5 T_c. We also investigate the possibility of
optimization by using a variational (``screened'') perturbation theory in the
effective theory. At two loops, this gives a result below the ideal gas value,
and also closer to lattice results than the recent two-loop
hard-thermal-loop-screened result of Andersen et al. While at three-loop order
the gap equation of dimensionally reduced screened perturbation theory does not
have a solution in QCD, this is remedied upon inclusion of the four-loop
logarithms.


title: Constraints on Scalar Couplings from $\pi^\pm \to l^\pm\nu_l$

abstract:
  New interactions with Lorentz scalar structure, arising from physics beyond
the standard model of electroweak interactions, will induce effective
pseudoscalar interactions after renormalization by weak interaction loop
corrections. Such induced pseudoscalar interactions are strongly constrained by
data on $\pi^\pm \to l^\pm \nu_l$ decay. These limits on induced pseudoscalar
interactions imply limits on the underlying fundamental scalar interactions
that in many cases are substantially stronger than limits on scalar
interactions from direct Beta-decay searches.


title: Transitions of two baryons to the H dibaryon in nuclei

abstract:
  We calculate the suppression in the rate at which two baryons in a nucleus
(viz., nucleons or $\Lambda$'s) convert to an H dibaryon, using an Isgur-Karl
wavefunction for quarks in the baryons and H, and a Bethe-Goldstone
wavefunction for the baryons in the nucleus. If $r_H \lsi 1/3~ r_N$, we find
$\tau_{A_{\Lambda\Lambda}\to A'_H}\gsi \tau_\Lambda$ and the observation of
$\Lambda$ decays from double-$\Lambda$ hypernuclei does not exclude the
existence of the H. If $m_H < 2 m_p$, nuclei are unstable but have very long
lifetimes. For reasonable values of $r_H$ and the nuclear wavefunction, the
lifetime can be long enough to evade anticipated SuperK limits $\tau_{A_{NN}\to
A'_H}\gsi {\rm few} 10^{29}$ yr, or short enough to be observed. An analysis of
SuperK data to look for this possibility should be undertaken.


title:
Testing anomalous gauge couplings of the Higgs boson via weak-boson
  scatterings at the LHC

abstract:
  We propose a sensitive way to test the anomalous HVV couplings
(V=W(+/-),Z(0)) of the Higgs boson (H), which can arise from either the
dimension-3 effective operator in a nonlinearly realized Higgs sector or the
dimension-6 effective operators in a linearly realized Higgs sector, via
studying the VV scattering processes at the CERN LHC. The gold-plated pure
leptonic decay modes of the final state weak bosons in the processes pp->VVjj
are studied. For comparison, we also analyze the constraints from the precision
electroweak data, the expected precision of the measurements of the Higgs boson
production rate, decay width and branching ratios at the Tevatron run-2 and the
CERN LHC, and the requirement of unitarity of the S-matrix. We show that, with
an integrated luminosity of 300 inverse fb and sufficient kinematical cuts for
suppressing the backgrounds, studying the process
pp->w(+)+W(+)+j+j->l(+)+nu+l(+)+nu+j+j can probe the anomalous HWW couplings at
a few tens of percent level for the nonlinearly realized Higgs sector, and at
the level of 0.01-0.08 inverse TeV for the linearly realized effective
Lagrangian.


title:
Bounding the Tau Neutrino Magnetic Moment from the Process E+ E- -->
  Gamma Nu Anti-Nu

abstract:
  In a class of $E_6$ inspired models with a light additional neutral vector
boson, we discuss the effects of the magnetic moment of the tau neutrino by
analyzing $e^{+}e^{-}$ $\to $ $\gamma \nu \bar{\nu}$ at the $Z$-pole. We take
into account present scenarios for the extra Abelian group and vary extra
neutral gauge boson mass beyond the present experimental exclusion limits. The
present LEP experimental results prove us to set an upper bound on the magnetic
moment of the tau neutrino: $\kappa_{\nu_{\tau}}$ $ \leq $ 1.83*10$^{-6}$ .


title:
An x-Space Analysis of Evolution Equations: Soffer's Inequality and the
  Non-forward Evolution

abstract:
  We analize the use of algorithms based in x-space for the solution of
renormalization group equations of DGLAP-type and test their consistency by
studying bounds among partons distributions - in our specific case Soffer's
inequality and the perturbative behaviour of the nucleon tensor charge - to
next-to-leading order in QCD . A discussion of the perturbative resummation
implicit in these expansions using Mellin moments is included. We also comment
on the (kinetic) proof of positivity of the evolution of $h_1$, using a kinetic
analogy and illustrate the extension of the algorithm to the evolution of
generalized parton distributions. We prove positivity of the non-forward
evolution in a special case and illustrate a Fokker-Planck approximation to it.


title: Event Shape/Energy Flow Correlations

abstract:
  We introduce a set of correlations between energy flow and event shapes that
are sensitive to the flow of color at short distances in jet events. These
correlations are formulated for a general set of event shapes, which includes
jet broadening and thrust as special cases. We illustrate the method for
electron-positron annihilation dijet events, and calculate the correlation at
leading logarithm in the energy flow and at next-to-leading-logarithm in the
event shape.


title: Asymptotics of the perturbative series for f_{B^*}/f_B

abstract:
  We investigate the structure of the leading IR renormalon singularity in the
QCD/HQET matching coefficients for heavy-light quark currents beyond the
large-\beta_0 limit. From this result, we derive the large-order behaviour of
the perturbative series for these coefficients, and for ratios of meson matrix
elements, such as f_{B^*}/f_B.


title:
Diffractive production of vector mesons in Deep Inelastic Scattering
  within k_t-factorization approach

abstract:
  In this work we give a theoretical description of the elastic vector meson
production in diffractive DIS developed within the k_t-factorization formalism.
Since the k_t-factorization scheme does not require large values of Q^2+m_V^2,
we conduct an analysis that is applicable to all values of Q^2 from photo- up
to highly virtual production of vector mesons. The basic quantity in this
approach -- the unintegrated gluon structure function -- was for the first time
extracted from the experimental data on F_{2p}, thoroughly investigated, and
consistently used in the vector meson production calculation. Moreover, by
limiting ourselves to the lowest Fock state of the vector meson, we were able
to construct in a closed form the theory of spin-angular coupling in the vector
meson. This allowed us for the first time to address the production of a vector
meson in a given spin-angular state. We performed an extensive analytical and
numerical investigation of the properties of 1S, 2S, and D-wave vector meson
production reactions. Treating the physical ground state vector mesons as
purely 1S states, we observed a good overall agreement with all available
experimental data on vector meson production. For the excited states, our
analysis predicts a picture which is remarkably different from 1S-state, so
that such reactions can be regarded as potential sources of new information on
the structure of excited states in vector mesons.


title:
A Coherent Interpretation of the Form Factors of the Nucleon in Terms of
  a Pion Cloud and Constituent Quarks

abstract:
  The recent unbiased measurements of the electric form factor of the neutron
suggest that its shape may be interpreted as a smooth broad distribution with a
bump at Q^2 \approx 0.3(GeV/c)^2 superimposed. As a consequence the
corresponding charge distribution in the Breit frame shows a negative charge
extending as far out as 2fm. It is natural to identify this charge with the
pion cloud. This realisation is then used to reanalyse all old and new data of
the electric and magnetic from factors of the proton and the neutron by a
phenomenological fit and by a fit based on the constituent quark model. It is
shown that it is possible to fit all form factors coherently with both
ansaetzen and that they all show the signal of the pion cloud.


title: Minimal SUSY SO(10), b-$\tau$ unification and large neutrino mixings

abstract:
  We show that the assumption of type II seesaw mechanism for small neutrino
masses coupled with $b-\tau$ mass unification in a minimal SUSY SO(10) model
leads not only to a natural understanding of large atmospheric mixing angle
($\theta_{23}$) among neutrinos, as recently pointed out, but also to large
solar angle ($\theta_{12}$) and a small $\theta_{13}\equiv U_{e3}$ as required
to fit observations. This is therefore a minimal, completely realistic grand
unified model for all low energy observations that naturally explains the
diverse mixing patterns between the quark and leptons without any additional
inputs such as extra global symmetries. The proposed long baseline neutrino
experiments will provide a crucial test of this model since it predicts
$U_{e3}\simeq 0.16$ for the allowed range of parameters.


title:
Contact Interaction Searches at the Linear Collider: Energy, Luminosity
  and Positron Polarization Dependencies

abstract:
  Many types of new physics can lead to contact interaction-like modifications
in $e^+e^-$ processes below direct production threshold. This report summarizes
a survey of contact interaction search reaches at the Linear Collider as
functions of energy, luminosity and positron polarization. The various
tradeoffs between these quantities in such searches are examined in detail.


title: Current Short-Range Tests of the Gravitational Inverse Square Law

abstract:
  Motivated in large part by the possibility of observing signatures of compact
extra dimensions, experimental searches for deviations from Newtonian gravity
at short distances have improved in sensitivity by many orders of magnitude in
the past five years. We review the essential features of the experiments
responsible for the current limits on new effects in the range from a few
microns to a few centimeters, and discuss prospects for the near future.


title:
Gluino Pair Production in e^+e^- and Photon-Photon Collisions at CERN
  CLIC

abstract:
  We confront the generally small cross sections for gluino pair production in
e^+e^- annihilation with the much larger ones in photon-photon scattering at a
multi-TeV linear collider like CERN CLIC. The larger rates and the steeper rise
of the cross section at threshold may allow for a precise gluino mass
determination in high-energy photon-photon collisions for a wide range of
squark masses and post-LEP SUSY benchmark points.


title: Some methods to evaluate complicated Feynman integrals

abstract:
  I discuss a progress in calculations of Feynman integrals based on the
Gegenbauer Polynomial Technique and the Differential Equation Method.


title:
Relations between \Delta M_{s,d} and B_{s,d}\to \mu\bar\mu in Models
  with Minimal Flavour Violation

abstract:
  The predictions for the B_{s,d}-\bar B_{s,d} mixing mass differences \Delta
M_{s,d} and Br(B_{s,d}\to\mu\bar\mu) within the Standard Model (SM) and its
extensions suffer from considerable hadronic uncertainties present in the
B_{s,d}-meson decay constants F_{B_{s,d}} that enter these quantities
quadratically. We point out that in the restricted class of models with minimal
flavour violation (MFV) in which only the SM low energy operators are relevant,
the ratios Br(B_{q}\to\mu\bar\mu)/\Delta M_q (q=s,d) do not depend on F_{B_{q}}
and the CKM matrix elements. They involve in addition to the short distance
functions and B-meson lifetimes only the non-perturbative parameters \hat
B_{s,d}. The latter are under much better control than F_{B_{s,d}}.
Consequently in these models the predictions for Br(B_{q}\to\mu\bar\mu) have
only small hadronic uncertainties once \Delta M_q are experimentally known. Of
particular interest is also the relation
Br(B_{s}\to\mu\bar\mu)/Br(B_{d}\to\mu\bar\mu)=\hat B_{d}/\hat B_{s}
\tau(B_{s})/\tau(B_{d}) \Delta M_{s}/\Delta M_{d} that is practically free of
theoretical uncertainties as \hat B_{s}/\hat B_{d}=1 up to small SU(3) breaking
corrections. Using these ideas within the SM we find much more accurate
predictions than those found in the literature: Br(B_{s}\to\mu\bar\mu)=(3.4\pm
0.5)\cdot 10^{-9} and Br(B_{d}\to\mu\bar\mu)=(1.00\pm 0.14)\cdot 10^{-10} were
in the first case we assumed as an example \Delta M_s=(18.0\pm 0.5)/ps.


title:
The value of QCD coupling constant and power corrections in the
  structure function F2 measurements

abstract:
  We reanalyze deep inelastic scattering data of BCDMS Collaboration by
including proper cuts of ranges with large systematic errors. We perform also
the fits of high statistic deep inelastic scattering data of BCDMS, SLAC, NM
and BFP Collaborations taking the data separately and in combined way and find
good agreement between these analyses. We extract the values of both the QCD
coupling constant \alpha_s(M^2_Z) up to NLO level and of the power corrections
to the structure function F_2.


title:
Sivers vs. Collins effect in azimuthal single spin asymmetries in pion
  production in SIDIS

abstract:
  Recently it has been argued that the transverse momentum dependent twist-2
Sivers distribution function does not vanish in QCD. Therefore both, the
Collins and Sivers effects, should be considered in order to explain the
azimuthal single spin asymmetries A(UL) in pion production in semi-inclusive
deeply inelastic lepton scattering of a longitudinally polarized target. On the
basis of presently available phenomenological information on the Sivers
function we estimate that for those asymmetries A(UL) in the kinematic region
of the HERMES experiments the Sivers effect can be neglected with respect to
the Collins effect. It is argued that the same feature holds also for the
COMPASS and CLAS experiments. This justifies theoretical approaches to
understand the HERMES data on the basis of the Collins effect only.


title: The hard scale in the exclusive rho-meson production in diffractive DIS

abstract:
  We re-examine the issue of the pQCD factorization scale in the exclusive rho
production in diffractive DIS from the k_t-factorization point of view. We find
that this scale differs significantly from, and possesses much flatter Q^2
behavior than widely used value (Q^2 + m_\rho^2)/4. With these results in mind,
we discuss the Q^2 shape of the rho meson production cross section. We
introduce rescaled cross sections, which might provide further insight into the
dynamics of rho production. We also comment on the recent ZEUS observation of
energy-independent ratio sigma(gamma* p --> rho p) / sigma_{tot}(gamma*p).


title:
Status of atmospheric neutrino(mu)<-->neutrino(tau) oscillations and
  decoherence after the first K2K spectral data

abstract:
  We review the status of nu_mu-->nu_tau flavor transitions of atmospheric
neutrinos in the 92 kton-year data sample collected in the first phase of the
Super-Kamiokande (SK) experiment, in combination with the recent spectral data
from the KEK-to-Kamioka (K2K) accelerator experiment (including 29 single-ring
muon events). We consider a theoretical framework which embeds flavor
oscillations plus hypothetical decoherence effects, and where both standard
oscillations and pure decoherence represent limiting cases. It is found that
standard oscillations provide the best description of the SK+K2K data, and that
the associated mass-mixing parameters are determined at 1 sigma (and d.o.f.=1)
as: Delta m^2=(2.6 +- 0.4)x10^{-3} eV^2 and sin^2(2theta)=1.00+0.00-0.05. As
compared with standard oscillations, the case of pure decoherence is
disfavored, although it cannot be ruled out yet. In the general case,
additional decoherence effects in the nu_mu-->nu_tau channel do not improve the
fit to the SK and K2K data, and upper bounds can be placed on the associated
decoherence parameter. Such indications, presently dominated by SK, could be
strengthened by further K2K data, provided that the current spectral features
are confirmed with higher statistics. A detailed description of the statistical
analysis of SK and K2K data is also given, using the so-called ``pull''
approach to systematic uncertainties.


title: The origin of the matter-antimatter asymmetry

abstract:
  Although the origin of matter-antimatter asymmetry remains unknown,
continuing advances in theory and improved experimental limits have ruled out
some scenarios for baryogenesis, for example the sphaleron baryogenesis at the
electroweak phase transition in the standard model. At the same time, the
success of cosmological inflation and the prospects for discovering
supersymmetry at the LHC have put some other models in sharper focus. We review
the current state of our understanding of baryogenesis with the emphasis on
those scenarios that we consider most plausible.


title: GUT ON ORBIFOLDS -- Dynamical Rearrangement of Gauge Symmetry --

abstract:
  Grand unified theory defined on higher-dimensional orbifolds provides a new
way to solve the hierarchy problem. In gauge theory on an orbifold many
different sets of boundary conditions imposed at orbifold fixed points (branes)
are related by large gauge transformations, forming an equivalent class of
boundary conditions. Thanks to the Hosotani mechanism the physics remains the
same in all theories in a given equivalent class, though the symmetry of
boundary conditions differs from each other. Quantum dynamics of Wilson line
phases rearranges the gauge symmetry. In the nonsupersymmetric SU(5) model the
presence of bulk fermions leads to the spontaneous breaking of color SU(3). In
the supersymmetric model with Scherk-Schwarz SUSY breaking, color SU(3) is
spontaneously broken even in the absence of bulk fermions if there are Higgs
multiplets.


title:
Constraints on Sparticle Spectrum in different Supersymmetry Breaking
  Models

abstract:
  We derive sum rules for the sparticle masses in different models of
supersymmetry breaking. This includes the gravity mediated models (SUGRA
models) as well as models in which supersymmetry breaking terms are induced by
super-Weyl anomaly (AMSB models). These sum rules can help in distinguishing
between these models. In particular we obtain an upper bound on the mass of the
lightest neutralino as a function of the gluino mass in SUGRA and AMSB models.


title: Magnetic moment of the (rho) meson in light cone QCD

abstract:
  The magnetic moment $\mu$ of the "rho" meson is studied in QCD light cone sum
rules, and it is found that "mu = (2.3 pm 0.5)". A comparison of our result on
the magnetic moment of the "rho" meson with the predictions of the other
approaches, is presented.


title: The Absorptive Extra Dimensions

abstract:
  It is well known that gravity and neutrino oscillation can be used to probe
large extra dimensions in a braneworld scenario. We argue that neutrino
oscillation remains a useful probe even when the extra dimensions are small,
because the brane-bulk coupling is likely to be large. Neutrino oscillation in
the presence of a strong brane-bulk coupling is vastly different from the usual
case of a weak coupling. In particular, some active neutrinos could be absorbed
by the bulk when they oscillate from one kind to another, a signature which can
be taken as the presence of an extra dimension. In a very large class of models
which we shall discuss, the amount of absorption for all neutrino oscillations
is controlled by a single parameter, a property which distinguishes extra
dimensions from other mechanisms for losing neutrino fluxes.


title:
Constraints on the CKM angle $\alpha$ from the measured CP asymmetries
  and branching ratios of $B \to \pi^+ \pi^-, \pi^+ \pi^0$ and $K^0\pi^+$
  decays

abstract:
  In this paper, we draw constraints on the Cabibbo-Kobayashi-Maskawa (CKM)
angle $\alpha$ and the strong phase $\delta$ from the experimental measurements
of $\ssb$, the CP-violating asymmetries and branching ratios of $B \to \pi^+
\pi^-, \pi^+ \pi^0$ and $K^0 \pi^+$ decays. In the SM, the measured $\ssb$
leads to an upper limit on $\alpha$: $\alpha \leq 180^\circ-\beta$. Taking the
weighted-average of the newest BaBar and Belle measurements of $\spp$ and
$\app$ in $B^0 \to \pi^+\pi^-$ decay as the experimental input, we find the
allowed range of angle $\alpha$, $76^\circ \leq \alpha \leq 135^\circ$ for
$r=|P/T| =0.3 \pm 0.1 $. From the measured CP-averaged branching ratios of $B
\to \pi^+ \pi^-, \pi^+ \pi^0$ and $K^0 \pi^+$ decays, we found an inequality,
$\cos{\alpha} \cos{\delta} \geq 0.45$. The region of $70^\circ \leq \alpha \leq
110^\circ$ is thus excluded by applying this inequality. The combined
constraints on $\alpha$ and $\delta$ are $117^\circ \leq \alpha \leq 135^\circ$
and $-160^\circ \leq \delta \leq -132^\circ$ if we take $\spp=0.49 \pm 0.27$
and $\app=0.51 \pm 0.19$ as the experimental input. The new lower limit on the
angle $\alpha$ is dominated by the measured branching ratios considered in this
paper, and is much stronger than those obtained before.


title: GUT relation in Neutrino-Induced Flavor Physics in SUSY SU(5) GUT

abstract:
  In the SUSY SU(5) GUT with the right-handed neutrinos, the neutrino Yukawa
coupling induces the flavor-violating mass terms for the right-handed down
squarks and left-handed sleptons, and they lead to imprint on the flavor
physics in the hadronic and leptonic sectors. In this paper we study CP
violation in $B_d^0$ and $B_s^0$, which is induced by the tau-neutrino Yukawa
coupling. In particular, we notice the correlation of the CP asymmetries in
$B_d^0\to \phi K_s$ ($S_{\phi K_s}$) and $B_s^0\to J/\psi \phi$ ($S_{J/\psi
\phi}$) with other observables, such as $Br(\tau\to\mu\gamma)$, the muon EDM
($d_\mu$), and the mixing-induced CP asymmetry in $B_d^0\to M_s^0\gamma$
($A_{bsg}$), since they have a common origin of the CP and flavor violation.
The measurements are expected to play a significant role for consistency check
of the SUSY SU(5) GUT. The hierarchical right-handed neutrino masses make the
correlation better. We find that the current bound on $Br(\tau\to\mu\gamma)$
constrains the allowed region for $S_{\phi K_s}$ in this model.


title: The Quark Gluon Plasma: lattice computations put to experimental test

abstract:
  I describe how lattice computations are being used to extract experimentally
relevant features of the quark gluon plasma. I deal specifically with
relaxation times, photon emissivity, strangeness yields, event by event
fluctuations of conserved quantities and hydrodynamic flow. Finally I give
evidence that the plasma is liquid-like in some ways.


title: Impact of CFL Quark Matter on the Cooling of Compact Stars

abstract:
  The cooling mechanism of compact stars with quark cores in the color-flavor
locked phase is discussed. It is argued that the high thermal conductivity of
the quark core plays a key role in the stellar cooling. It implies that the
cooling time of compact stars with color-flavor locked quark cores is similar
to that of ordinary neutron stars, unless the star is almost completely made of
color-flavor locked quark matter.


title: Minimal seesaw mechanism

abstract:
  In the framework of the seesaw mechanism, and adopting a typical form for the
Dirac neutrino mass matrix, we discuss the impact of minimal forms of the
Majorana neutrino mass matrix. These matrices contain four or three texture
zeros and only two parameters, a scale factor and a hierarchy parameter. Some
forms are not compatible with large lepton mixing and are ruled out. Moreover,
a normal mass hierarchy for neutrinos is predicted.


title: Solar Neutrino Experiments: An Overview

abstract:
  This article describes the seven experiments Homestake, Kamiokande, SAGE,
GALLEX, Super-Kamiokande, GNO and SNO which have so far provided data on the
measurement of the solar neutrino fluxes. The detection mechanism, the salient
features of the detectors and the results of each experiment are presented. How
the solar neutrino problem has evolved and became more focused with each
experimental data is summarized. The goals for the future experiments are
outlined.


title:
Production of gluons in the classical field model for heavy ion
  collisions

abstract:
  The initial stages of relativistic heavy ion collisions are studied
numerically in the framework of a 2+1 dimensional classical Yang-Mills theory.
We calculate the energy and number densities and momentum spectra of the
produced gluons. The model is also applied to non central collisions. The
numerical results are discussed in the light of RHIC measurements of energy and
multiplicity and other theoretical calculations. Some problems of the present
approach are pointed out.


title: Leptogenesis and Bi-Unitary Parametrization of Neutrino Yukawa Matrix

abstract:
  We analyze the neutrino Yukawa matrix by considering three constraints: the
out-of-equilibrium condition of lepton number violating process responsible for
leptogenesis, the upper bound of branching ratio of lepton flavor violating
decay, and the prediction of large mixing angles using the see-saw mechanism.
In a certain parametrization with bi-unitary transformation, it is shown that
the structure which satisfies the constraints can be characterized by only
seven types of Yukawa matrices. The constraint of the branching ratio of LFV
turns out as a redundant one after applying other two constraints. We propose
that this parametrization can be the framework in which the CP asymmetry of
lepton number violating process can be predicted in terms of observable
neutrino parameters at low energy, if necessary, under assumptions following
from a theory with additional symmetries. There is an appealing model of
neutrino Yukawa matrix considering the CP asymmetry for leptogenesis and the
theoretical motivation to reduce the number of free parameters.


title:
CP violation and matter effect for a variable earth density in very long
  baseline experiments

abstract:
  The perturbative treatment of subdominant oscillation and the matter effect
in neutrino beams/superbeams, propagating over long baselines and being used to
look for CP violation, is studied here for a general matter density function
varying with distance. New lowest order analytic expressions are given for
different flavour transition and survival probabilities in a general neutrino
mixing basis and a variable earth matter density profile. It is demonstrated
that the matter effect in the muon neutrino (antineutrino) flavour survival
probability vanishes to this order, provided the depletion, observed for
atmospheric muon neutrinos and antineutrinos at super-Kamiokande, is strictly
maximal. This result is independent of the earth density profile and the
distance L between the source and the detector. In the general variable density
case we show that one cannot separate the matter induced asymmetry from a
genuine CP effect by keeping two detectors at distances $L_1$ and $L_2$ from
the source while maintaining a fixed ratio $L_1/E_1 = L_2/E_2$. This needs to
be done numerically and we estimate the asymmetry generated by the earth matter
effect with particular density profiles and some chosen parameters for very
long baseline neutrino oscillation experiments.


title: Low-Mass Baryon-Antibaryon Enhancements in B Decays

abstract:
  The nature of low-mass baryon-antibaryon enhancements seen in B decays is
explored. Three possibilities include (i) states near threshold as found in a
model by Nambu and Jona-Lasinio, (ii) isoscalar states with $J^{PC} = 0^{\pm
+}$ coupled to a pair of gluons, and (iii) low-mass enhancements favored by the
fragmentation process. Ways of distinguishing these mechanisms using angular
distributions and flavor symmetry are proposed.


title:
Electroweak instantons as a solution to the ultrahigh energy cosmic ray
  puzzle

abstract:
  We propose a scenario in which a simple power-like primary spectrum for
protons with sources at cosmological distances leads to a quantitative
description of all the details of the observed cosmic ray spectrum for energies
from 10^{17} eV to 10^{21} eV. As usual, the ultrahigh energy protons with
energies above E_{GZK} ~ 4 x 10^{19} eV loose a large fraction of their
energies by the photoproduction of pions on the cosmic microwave background,
which finally decay mainly into neutrinos. In our scenario, these so-called
cosmogenic neutrinos interact with nucleons in the atmosphere through Standard
Model electroweak instanton-induced processes and produce air showers which are
hardly distinguishable from ordinary hadron-initiated air showers. In this way,
they give rise to a second contribution to the observed cosmic ray spectrum --
in addition to the one from above mentioned protons -- which reaches beyond
E_{GZK}. Since the whole observed spectrum is uniquely determined by a single
primary injection spectrum, no fine tuning is needed to fix the ratio of the
spectra below and above E_{GZK}. The statistical analysis shows an excellent
goodness of this scenario. Possible tests of it range from observations at
cosmic ray facilities and neutrino telescopes to searches for QCD
instanton-induced processes at HERA.


title:
Very Long Baseline Neutrino Oscillation Experiment for Precise
  Measurements of Mixing Parameters and CP Violating Effects

abstract:
  We analyze the prospects of a feasible, Brookhaven National Laboratory based,
very long baseline (BVLB) neutrino oscillation experiment consisting of a
conventional horn produced low energy wide band beam and a detector of 500 kT
fiducial mass with modest requirements on event recognition and resolution.
Such an experiment is intended primarily to determine CP violating effects in
the neutrino sector for 3-generation mixing. We analyze the sensitivity of such
an experiment. We conclude that this experiment will allow determination of the
CP phase $\delta_{CP}$ and the currently unknown mixing parameter
$\theta_{13}$, if $\sin ^2 2 \theta_{13} \geq 0.01$, a value $\sim 15$ times
lower than the present experimental upper limit. In addition to $\theta_{13}$
and $\delta_{CP}$, the experiment has great potential for precise measurements
of most other parameters in the neutrino mixing matrix including $\Delta
m^2_{32}$, $\sin^2 2\theta_{23}$, $\Delta m^2_{21}\times \sin 2 \theta_{12}$,
and the mass ordering of neutrinos through the observation of the matter effect
in the $\nu_\mu \to \nu_e$ appearance channel.


title:
Renormalization-Group Evolution of the B-Meson Light-Cone Distribution
  Amplitude

abstract:
  An integro-differential equation governing the evolution of the leading-order
B-meson light-cone distribution amplitude is derived. The anomalous dimension
in this equation contains a logarithm of the renormalization scale, whose
coefficient is identified with the cusp anomalous dimension of Wilson loops.
The exact analytic solution of the evolution equation is obtained, from which
the asymptotic behavior of the distribution amplitude is derived. These results
can be used to resum Sudakov logarithms entering the hard-scattering kernels in
QCD factorization theorems for exclusive B decays.


title:
Radiative muon (pion) pair production in high energy electron-positron
  annihilation process

abstract:
  Process of muon (pion) pair production with small invariant mass in the
electron-positron high-energy annihilation, accompanied by emission of hard
photon at large angles, is considered. We find that the Dell-Yan picture for
differential cross section is valid in the charge-even experimental set-up.
Radiative corrections both for electron block and for final state block are
taken into account.


title: Exact $S_3$ symmetry solving the supersymmetric flavor problem

abstract:
  The exact discrete flavor symmetry, $S_3$ in the hadronic sector and $S_3
\times Z_2$ in the leptonic sector, which has been recently found, is
introduced in a supersymmetric extension of the standard model. We investigate
the supersymmetric flavor problem, and explicitly find that thanks to the
flavor symmetry the dangerous FCNC processes and CP-violating phases are
sufficiently suppressed.


title:
The t-tbar cross-section at 1.8 and 1.96 TeV: a study of the systematics
  due to parton densities and scale dependence

abstract:
  We update the theoretical predictions for the t-tbar production cross-section
at the Tevatron, taking into account the most recent determinations of
systematic uncertainties in the extraction of the proton parton densities.


title: From QFT to DCC

abstract:
  A quantum field theoretical model for the dynamics of the disoriented chiral
condensate is presented. A unified approach to relate the quantum field theory
directly to the formation, decay and signals of the DCC and its evolution is
taken. We use a background field analysis of the O(4) sigma model keeping
one-loop quantum corrections (quadratic order in the fluctuations). An
evolution of the quantum fluctuations in an external, expanding metric which
simulates the expansion of the plasma, is carried out. We examine, in detail,
the amplification of the low momentum pion modes with two competing effects,
the expansion rate of the plasma and the transition rate of the vacuum
configuration from a metastable state into a stable state.We show the effect of
DCC formation on the multiplicity distributions and the Bose-Einstein
correlations.


title: Flavour Changing Neutral Currents in Intersecting Brane Models

abstract:
  Intersecting D-brane models provide an attractive explanation of family
replication in the context of string theory. We show, however, that the
localization of fermion families at different brane intersections in the extra
dimensions introduces flavour changing neutral currents mediated by the
Kaluza-Klein excitations of the gauge fields. This is a generic feature in
these models, and it implies stringent bounds on the mass of the lightest
Kaluza-Klein modes (becoming severe when the compactification radii are larger
than the string length). We present the full string calculation of four-fermion
interactions in models with intersecting D-branes, recovering the field theory
result. This reveals other stringy sources of flavour violation, which give
bounds that are complementary to the KK bounds (i.e. they become severe when
the compactification radii are comparable to the string length). Taken together
these bounds imply that the string scale is larger than $M_s\gtrsim 10^2$ TeV,
implying that non-supersymmetric cases are phenomenologically disfavoured.


title:
The Ratio of W + N jets To Z/gamma + N jets As a Precision Test of the
  Standard Model

abstract:
  We suggest replacing measurements of the individual cross-sections for the
production of W + N jets and Z/gamma + N jets in searches for new high-energy
phenomena at hadron colliders by the precision measurement of the ratios (W+0
jet)/(Z+0 jet), (W+1 jet)/(Z+1 jet), (W+2 jets)/(Z+2 jets),... (W+N jets)/(Z+N
jets), with N as large as 6 (the number of jets in ttbarH). These ratios can
also be formed for the case where one or more of the jets is tagged as a b or c
quark. Existing measurements of the individual cross sections for Wenu + N jets
at the Tevatron have systematic uncertainties that grow rapidly with N, being
dominated by uncertainties in the identification of jets and the jet energy
scale. These systematics, and also those associated with the luminosity, parton
distribution functions (PDF's), detector acceptance and efficiencies, and
systematics of jet finding and b-tagging, are expected to substantially cancel
in calculating the ratio of W to Z production in each N-jet channel, allowing a
greater sensitivity to new contributions in these channels in Run II at the
Tevatron and at the LHC.


title: Large Direct CP Violation in B -> phi phi Xs Decays

abstract:
  We present a novel method to search for a new CP-violating phase in b ->
ss~ss~s transition using B -> phi phi Xs decays, where Xs represents a final
state with a specific strange flavor such as K+/-, K*+/-, or K+/-pi-/+. Direct
CP violation can be enhanced due to an interference between an amplitude beyond
the standard model (SM) and the SM decay amplitude through the eta_c resonance.
We find that the CP asymmetry can be as large as 0.4 within the present
experimental bounds on the b -> ss~s transition. These decays provide a very
clean experimental signature and the background is expected to be small in
particular at e+e- B factories. A simulation study for the B+/- -> phi phi K+/-
decay shows that the statistical significance of CP violation can exceed 5
standard deviations with 10^9 B mesons.


title: Higher Dimensions in High Energy Collisions

abstract:
  Different possibilities of a detection of signals from extra space dimensions
at high energy colliders are reviewed.


title: SuperGZK neutrinos: testing physics beyond the Standard Model

abstract:
  The sources and fluxes of superGZK neutrinos, $E>10^{20}$ eV, are discussed.
The most promising sources are reionization bright phase, topological defects,
superheavy dark matter and mirror matter. The energy of neutrinos can be above
the GUT scale ($\sim 10^{16}$ GeV). The predicted fluxes are observable by
future space detectors EUSO and OWL.


title: Review of Top Quark Physics

abstract:
  We present an overview of Top Quark Physics - from what has been learned so
far at the Tevatron, to the searches that lie ahead at present and future
colliders. We summarize the richness of the measurements and discuss their
possible impact on our understanding of the Standard Model by pointing out
their key elements and limitations. When possible, we discuss how the top quark
may provide a connection to new or unexpected physics.


title:
Trilepton + top signal from chargino-neutralino decays of MSSM charged
  Higgs bosons at the LHC

abstract:
  We perform for the Large Hadron Collider (LHC) a detailed study of charged
Higgs boson production via the top-bottom quark associated mode followed by
decays into a chargino and a neutralino, with masses and couplings as given by
the general Minimal Supersymmetric Standard Model (MSSM). We focus our
attention on the region of parameter space where the charged Higgs is heavier
than the top quark, with intermediate values of tan beta. In this region, the
identification of charged Higgs bosons via decays into Standard Model (SM)
particles has proven to be ineffective. Modelling the CMS detector, we find
that a signature consisting of three hard leptons accompanied by a hadronically
reconstructed top quark plus substantial missing transverse energy, which may
result from charged Higgs decays into neutralinos and charginos, can be made
viable over a large variety of initially overwhelming SM and MSSM backgrounds,
provided MSSM input parameters are favourable: notably, a small mu parameter
and light sleptons are important prerequisites. We quantify these statements by
performing a fairly extensive scan of the parameter space, including realistic
hadron-level simulations, and delineate some potential discovery regions.


title: MSSM with Yukawa Quasi-Unification

abstract:
  We consider the constrained minimal supersymmetric standard model which
emerges from one theory with a small deviation from Yukawa unification which is
adequate for $\mu>0$. We show that this model possesses a wide and natural
range of parameters which is consistent with the data on $b\to s\gamma$, the
muon anomalous magnetic moment, the cold dark matter abundance in the universe,
and the Higgs boson masses.


title:
Detection of MSSM Higgs bosons from supersymmetric particle cascade
  decays at the LHC

abstract:
  In the context of the Minimal Supersymmetric extension of the Standard Model,
we study the production of Higgs bosons at the Large Hadron Collider via
cascade decays of scalar quarks and gluinos. We focus on the cascades involving
heavier charginos and neutralinos, which decay into the neutral $h,A,H$ and
charged $H^\pm$ bosons and lighter charginos and neutralinos, but we will also
discuss direct decays of third--generation squarks into their lighter partners
and Higgs bosons as well as top quark decays into $H^\pm$ bosons. We show that
the production rates of relatively light Higgs bosons, $M_\Phi \lsim 250$ GeV,
via these mechanisms can be rather large in some areas of the parameter space.
Performing a fast detector simulation analysis that takes into account the
signals and the various backgrounds, we show that the detection of the neutral
Higgs bosons through their decays into $b\bar{b}$ pairs, and of the charged
Higgs particles through the $\tau^\pm \nu$ signature, is possible at the LHC.


title: Theoretical Aspects of Rare Kaon Decays

abstract:
  Most of the analytic approaches which are used at present to understand Kaon
decays, get their inspiration from QCD in the limit of a large number of
colours $N_c$. After a general overview, we illustrate this with a recent
application to the evaluation of the process $K_L\ra\mu^+ \mu^-$ in the
Standard Model.


title: Higgs Physics at Future Colliders: recent theoretical developments

abstract:
  I review the physics of the Higgs sector in the Standard Model and its
minimal supersymmetric extension, the MSSM. I will discuss the prospects for
discovering the Higgs particles at the upgraded Tevatron, at the Large Hadron
Collider, and at a future high--energy $e^+e^-$ linear collider with
centre--of--mass energy in the 350--800 GeV range, as well as the possibilities
for studying their fundamental properties. Some emphasis will be put on the
theoretical developments which occurred in the last two years.


title: Yukawa Quasi-Unification and Neutralino Relic Density

abstract:
  The construction of a Supersymmetric Grand Unified Model based on the
Pati-Salam gauge group is briefly reviewed and the low energy consequences of
the derived asymptotic Yukawa quasi-unification conditions are examined. In the
framework of the resulting Constrained Minimal Supersymmetric Standard Model,
the cosmological relic density of the bino-like LSP is calculated and the
results are explicitly compared with {\tt micrOMEGAs}. In addition to the Cold
Dark Matter constraint, restrictions on the parameter space, arising from the
Higgs boson masses, the SUSY corrections to $b$-quark mass, the muon anomalous
magnetic moment and the inclusive decay $b\to s\gamma$ are, also, investigated.
For $\mu>0$, a wide and natural range of parameters is allowed. On the
contrary, the $\mu<0$ case not only is disfavored from the present experimental
data on the muon anomalous magnetic moment, but also, it can be excluded from
the combination of the Cold Dark Matter and BR($b\to s \gamma$) requirements.


title: Comment on Quark Masses in SCET

abstract:
  Quark masses are included in the SCET Lagrangian. Treating the strange quark
mass as order Lambda_{QCD}, we find that strange quark mass terms are
suppressed in SCET1, but are leading order in SCET2. This is relevant for B
decays to K^* and K. Strange quark mass effects in semileptonic and weak
radiative form factors are studied. They give corrections to the form factors
that are not suppressed by powers of the bottom quark mass, or, equivalently,
by the large recoil energy of the final state meson, and and preserve the heavy
to light form factor relations that follow from using the leading order
current.


title:
Investigating the Drell-Yan transverse momentum distribution in the
  color dipole approach

abstract:
  We study the influence of unitarity corrections on the Drell-Yan transverse
momentum distribution within the color dipole approach. These unitarity
corrections are implemented through the multiple scattering Glauber-Mueller
approach, which is contrasted with a phenomenological saturation model. The
process is analyzed for the center of mass energies of the Relativistic Heavy
Ion Collider (RHIC, $\sqrt{s}=500$ GeV) and of the Large Hadron Collider (LHC,
$\sqrt{s}=14$ TeV). In addition, the results are extrapolated down to current
energies of proton-proton collisions, where non-asymptotic corrections to the
dipole approach are needed. It is also shown that in the absence of saturation,
the dipole approach can be related to the QCD Compton process.


title: On large angle multiple gluon radiation

abstract:
  Jet shape observables which involve measurements restricted to a part of
phase space are sensitive to multiplication of soft gluon with large relative
angles and give rise to specific single logarithmically enhanced (SL) terms
(non-global logs). We consider associated distributions in two variables which
combine measurement of a jet shape V in the whole phase space (global) and that
of the transverse energy flow away from the jet direction, Eout (non-global).
We show that associated distributions factorize into the global distribution in
V and a factor that takes into account SL contributions from multi-gluon
``hedgehog'' configurations in all orders. The latter is the same that
describes the single-variable Eout distribution, but evaluated at a rescaled
energy VQ.


title:
Higher-order QED 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. In the presence of realistic selection criteria, the shift in the W
mass from a fit to the transverse mass distribution is found to be about 10 MeV
in the $W \to \mu \nu$ channel and almost negligible in the $W \to e \nu$
channel. The calculation, which is implemented in a Monte Carlo event generator
for data analysis, can contribute to reduce the uncertainty associated to the W
mass measurement at future hadron collider experiments.


title: $K_{\ell3}$ decays in Chiral Perturbation Theory

abstract:
  The process $K_{\ell3}$ is calculated to two-loop order ($p^6$) in Chiral
Perturbation Theory (ChPT) in the isospin conserved case. We present
expressions suitable for use with previous work in two-loop CHPT where the
order $p^4$ parameters ($L_i^r$) were determined from experiment.
  We point out that all the order $p^6$ parameters ($C_i^r$) that appear in the
value of $f_+(0)$ relevant for the determination of $|V_{us}|$ can be
determined from $K_{\ell3}$ measurements via the slope and the curvature of the
scalar form-factor. As a by product we update the value of the CKM matrix
element $| V_{us} |$.


title: The QCD Running Coupling at Finite Temperature and Density

abstract:
  We present for the first time a self-contained calculation of the QCD running
coupling at finite temperature and quark chemical potential, alpha_s(T, mu),
based on a semiclassical background field method. The hard thermal/dense loop
results on the Debye screening mass are recovered in a first approximation. The
final result can be interpreted as the ordinary zero temperature running
coupling, with momenta replaced by in-medium scales Lambda: at high density and
zero temperature, the quark scale is set by Lambda ~ 24.4 mu. At high
temperature and moderate densities, the quark in-medium scale reads Lambda^2 ~
[2.91 T]^2 + [1.91 mu]^2, which resembles the naive phenomenological estimate
Lambda^2 = (pi T)^2 + mu^2.


title: Towards an effective-action approach to fermion-loop corrections

abstract:
  We present a study of the effective action approach to incorporate
higher-order effects in e^+e^- -> n fermions. In its minimal version, the
effective action approach is found to exhibit problems with unitarity and
high-energy behaviour. We identify the origin of these problems by
investigating the zero-mode solutions of the Ward Identities. A numerical
analysis of the importance of the zero-mode solutions is presented for
four-fermion production processes.


title: Higgs and SUSY Searches at LHC : An Overview

abstract:
  I start with a brief summary of Higgs Mechanism and supersymmetry. Then I
discuss the theoretical constraints, current limits and search strategies for
Higgs boson(s) at LHC - first in the SM and then in the MSSM. Finally, I
discuss the analogous constraints and search strategies for the superparticles,
concentrating on the minimal supergravity model. Recent advances in identifying
the most promising channels for Higgs and SUSY searches are emphasized.


title: Present and Future sensitivity to a Z-prime

abstract:
  Various extensions of the Standard Model, i.e. string inspired groups like
E_6, extra dimensions, 'deconstruction', predict additional vector bosons. In
most cases these bosons can mix with the SM Z and this translates into a very
high sensitivity of precision measurements which can be performed at the Z
resonance. This aspect will be illustrated using SLD/LEP data and the possible
impact on the Higgs boson mass indirect determination. An extrapolation to the
accuracies which could be reached at FLC will be discussed. With accuracies
available at GigaZ it will become possible to elucidate the origin the Z' and
the symmetry breaking mechanism responsible for the mixing. Two examples show
the possible impact of FLC on the LHC program.


title: Hadron Resonance Mass Spectrum and Lattice QCD Thermodynamics

abstract:
  We confront lattice QCD results on the transition from the hadronic phase to
the quark--gluon plasma with hadron resonance gas and percolation models. We
argue that for T < T_c the equation of state derived from Monte--Carlo
simulations of (2+1) quark--flavor QCD can be well described by a hadron
resonance gas. We examine the quark mass dependence of the hadron spectrum on
the lattice and discuss its description in terms of the MIT bag model. This is
used to formulate a resonance gas model for arbitrary quark masses which can be
compared to lattice calculations. We finally apply this model to analyze the
quark mass dependence of the critical temperature obtained in lattice
calculations. We show that the value of T_c for different quark masses agrees
with lines of constant energy density in a hadron resonance gas. For large
quark masses a corresponding contribution from a glueball resonance gas is
required.


title:
Flavor-Mixing Effects on the QCD Phase Diagram at non-vanishing Isospin
  Chemical Potential: One or Two Phase Transitions?

abstract:
  We investigate effects of a fixed nonzero isospin chemical potential on the
mu_B-T phase diagram of strongly interacting matter using a
Nambu--Jona-Lasinio-type four fermion interaction. We focus on the influence of
a flavor-mixing interaction induced by instantons. We find that already for
rather moderate values of the coupling strength in the flavor-mixing channel
the recent findings of two seperate phase transitions do not persist.


title:
Polarisation in Sfermion Decays: Determining \tan\beta and Trilinear
  Couplings

abstract:
  The basic parameters of supersymmetric theories can be determined at future
e^+e^- linear colliders with high precision. We investigate in this report how
polarisation measurements in \tilde{\tau} and \tilde{t} or \tilde{b} decays to
\tau leptons and t quarks plus neutralinos or charginos can be used to measure
\tan\beta (in particular for large values) and to determine the trilinear
couplings A_{\tau}, A_t and A_b in sfermion pair production.


title: Diffraction of Protons and Nuclei at High Energies

abstract:
  We review the description of high energy diffraction from both the s and t
channel viewpoints, and demonstrate their consistency. We emphasize the role
played by s channel unitarity and multi-Pomeron exchanges. We explain how these
effects suppress hard diffractive processes. As examples, we describe the
calculation of diffractive dijet production at the Tevatron and predict some of
the rich diffractive phenomena accessible in proton-nuclear collisions at RHIC.


title:
Modeling realistic Earth matter density for CP violation in neutrino
  oscillation

abstract:
  We examine the effect of a more realistic Earth matter density model which
takes into account of the local density variations along the baseline of a
possi ble 2100 km very long baseline neutrino oscillation experiment. Its
influence to the measurement of CP violation is investigated and a comparison
with the commonly used global density models made. Significant differences are
found in the comparison of the results of the different density models.


title: Three-loop anomalous dimension of the heavy-light quark current in HQET

abstract:
  The anomalous dimension of the heavy-light quark current in HQET is
calculated with three-loop accuracy, as well as the renormalized heavy-quark
propagator. The NNL perturbative correction to f_B/f_D is obtained.


title:
Chi**2 analysis of the minimal supergravity model including WMAP,
  g(mu)-2 and b -> s gamma constraints

abstract:
  Recent results from the WMAP measurements of the cosmic background radiation
yield very tight constraints on the relic density of supersymmetric cold dark
matter. We combine the WMAP constraint with those from the anomalous magnetic
moment of the muon and the b -> s gamma branching fraction in a chi^2
determination over the minimal supergravity model (mSUGRA) parameter space. The
most favored region of mSUGRA parameter space for almost all tan(beta) values
is the hyperbolic branch/focus point (HB/FP) region, with moderate to small
values of superpotential Higgs mass |mu| and large GUT scale scalar mass m_0.
These favored regions of mSUGRA parameter space can be probed by direct search
experiments for supersymmetric dark matter. An exception to the HB/FP region
can occur at very large tan(beta) with positive mu values, where wide regions
allow resonance annihilation of neutralinos in the early universe.


title: Delta M_K and epsilon_K in the left-right supersymmetric model

abstract:
  We perform a complete analysis of $\Delta S=2$ processes in the kaon system
and evaluate $\Delta M_K$ and $\epsilon_K$ in the left-right supersymmetric
model. We include analytic expressions for the contributions of gluinos,
neutralinos and charginos. We obtain general constraints on off-diagonal mass
terms between the first two generations of both down-type and up-type squarks.
In the down-squark sector, we compare the results with gluino-only estimates.
In the up-squark sector, we find a complete set of bounds on all combinations
of chirality conserving or chirality flipping parameters. Finally, we comment
on the size of the bounds obtained by imposing left-right symmetry in the
squark sector.


title: QCD aspects of exclusive B meson decays

abstract:
  I review recent progress on understanding QCD dynamics involved in exclusive
$B$ meson decays. Different frameworks, including light-cone sum rules, QCD
factorization, perturbative QCD, soft-collinear effective theory, light-front
QCD, are discussed. Results from lattice QCD are quoted for comparison. I point
out the important issues in the above QCD methods, which require further
investigation.


title:
Measuring the Relative Strong Phase in $D^0 \to K^{*+} K^-$ and $D^0 \to
  K^{*-} K^+$ Decays

abstract:
  In a recently suggested method for measuring the weak phase $\gamma$ in
$B^\pm \to K^\pm (KK^*)_D$ decays, the relative strong phase $\delta_D$ in $D^0
\to K^{*+} K^-$ and $D^0 \to K^{*-} K^+$ decays (equivalently, in $D^0 \to
K^{*+} K^-$ and $\od \to K^{*+} K^-$) plays a role. It is shown how a study of
the Dalitz plot in $D^0 \to K^+ K^- \pi^0$ can yield information on this phase,
and the size of the data sample which would give a useful measurement is
estimated.


title:
Gamma^* - Gamma^* Scattering: Saturation and Unitarization in the BFKL
  approach

abstract:
  In this paper $\gamma^* - \gamma^*$ scattering with large, but more or less
equal virtualities of two photons is discussed using BFKL dynamics, emphasizing
the large impact parameter behavior ($b_t$) of the dipole-dipole amplitude. It
is shown that the non-perturbative contribution is essential to fulfill the
unitarity constraints in the region of $b_t > 1/2 m_\pi$, where $m_{\pi}$ is
pion mass. The saturation and the unitarization of the dipole-dipole amplitude
is considered in the framework of the Glauber-Mueller approach. The main result
is that we can satisfy the unitarity constraints introducing the
non-perturbative corrections only in initial conditions (Born amplitude).


title:
Description of composite systems in the spectral integration technique:
  the gauge invariance and analyticity constraints for the radiative decay
  amplitudes

abstract:
  The constraints followed from gauge invariance and analyticity are considered
for the amplitudes of radiative transitions of composite systems when composite
systems are treated in terms of spectral integrals. We discuss gauge-invariant
amplitudes for the transitions S -> gamma S and V -> gamma S with scalar S and
vector V mesons being two-particle composite systems of scalar (or
pseudoscalar) constituents, and we demonstrate the mechanism of cancellation of
false kinematical singularities. Furthermore, we explain how to generalize the
performed consideration for quark-antiquark systems, in particular, for the
reaction phi(1020) -> gamma f0(980). Here we also consider in more detail the
quark-model non-relativistic approach for this reaction.


title: QCD potential as a "Coulomb-plus-linear" potential

abstract:
  We show analytically that the QCD potential can be expressed, up to an
O(Lambda_QCD^3 r^2) uncertainty, as the sum of a ``Coulomb'' potential (with
log corrections at short distances) and a linear potential, within an
approximation based on perturbative expansion in alpha_S and the renormalon
dominance picture. The expansion of V_QCD(r) is truncated at O(alpha_S^N) [N =
6 pi/(beta_0 alpha_S)], where the term becomes minimal according to the
estimate by NLO renormalon, and is studied for N >> 1. Analytic expressions for
the linear potential are obtained in some cases.


title:
Partonic energy loss in ultrarelativistic heavy ion collisions: jet
  suppression versus jet fragmentation softening

abstract:
  We discuss the modification of a jet fragmentation function due to
medium-induced partonic energy loss in context of leading particle observables
in ultrarelativistic nucleus-nucleus interactions. We also analyze the relation
between in-medium softening jet fragmentation function and suppression of the
jet rates due to energy loss outside the jet cone. The predicted
anti-correlation between two effects allows to probe a fraction of partonic
energy loss carried out of the jet cone and truly lost to the jet.


title:
The rare top quark decays $t\to cV$ in the topcolor-assisted technicolor
  model

abstract:
  We consider the rare top quark decays in the framework of topcolor-assisted
technicolor (TC2) model. We find that the contributions of top-pions and
top-Higgs predicted by the TC2 model can enhance the SM branching ratios by as
much as 6-9 orders of magnitude. i.e., in the most case, the orders of
magnitude of branching ratios are $Br(t\to c g)\sim 10^{-5}$, $Br(t\to c Z)\sim
10^{-5}$, $Br(t\to c \gamma)\sim 10^{-7}$. With the reasonable values of the
parameters in TC2 model, such rare top quark decays may be testable in the
future experiments. So, rare top quark decays provide us a unique way to test
TC2 model.


title: Upper Bound of Proton Lifetime in Product-Group Unification

abstract:
  Models of supersymmetric grand unified theories based on SU(5)_GUT \times
U(N)_H gauge group (N = 2,3) have a symmetry that guarantees light Higgs
doublets and absence of dimension-five proton decay operators. We analysed the
proton decay induced by gauge-boson exchange in the models. Upper bounds of
proton lifetime are obtained; \tau(p\to \pi^0e^+) \lsim 6.0 \times 10^{33} yrs
in the SU(5)_GUT \times U(2)_H model and \tau(p\to \pi^0e^+) \lsim 5.3 \times
10^{35} yrs in the SU(5)_GUT \times U(3)_H model. Various uncertainties in the
predictions are also discussed.


title:
Renormalization Group and Decoupling in Curved Space: II. The Standard
  Model and Beyond

abstract:
  We continue the study of the renormalization group and decoupling of massive
fields in curved space, started in the previous article and analyse the higher
derivative sector of the vacuum metric-dependent action of the Standard Model.
The QCD sector at low-energies is described in terms of the composite effective
fields. For fermions and scalars the massless limit shows perfect
correspondence with the conformal anomaly, but similar limit in a massive
vector case requires an extra compensating scalar. In all three cases the
decoupling goes smoothly and monotonic. A particularly interesting case is the
renormalization group flow in the theory with broken supersymmetry, where the
sign of one of the beta-functions changes on the way from the UV to IR.


title:
Two-loop Improved Truncation of the Ghost-Gluon Dyson-Schwinger
  Equations: Multiplicatively Renormalizable Propagators and Nonperturbative
  Running Coupling

abstract:
  The coupled Dyson-Schwinger equations for the gluon and ghost propagators are
investigated in the Landau gauge using a two-loop improved truncation that
preserves the multiplicative renormalizability of the propagators. In this
truncation all diagrams contribute to the leading order infrared analysis. The
infrared contributions of the nonperturbative two-loop diagrams to the gluon
vacuum polarization are computed analytically, and this reveals that infrared
power behaved propagator solutions only exist when the squint diagram
contribution is taken into account. For small momenta the gluon and ghost
dressing functions behave respectively like (p^2)^{2\kappa} and
(p^2)^{-\kappa}, and the running coupling exhibits a fixed point. The values of
the infrared exponent and fixed point depend on the precise details of the
truncation. The coupled ghost-gluon system is solved numerically for all
momenta, and the solutions have infrared behaviors consistent with the
predictions of the infrared analysis. For truncation parameters chosen such
that \kappa=0.5, the two-loop improved truncation is able to produce solutions
for the propagators and running coupling which are in very good agreement with
recent lattice simulations.


title: Form Invariance of the Neutrino Mass Matrix

abstract:
  Consider the most general $3 \times 3$ Majorana neutrino mass matrix $\cal
M$. Motivated by present neutrino-oscillation data, much theoretical effort is
directed at reducing it to a specific texture in terms of a small number of
parameters. This procedure is often {\it ad hoc}. I propose instead that for
any $\cal M$ one may choose, it should satisfy the condition $U {\cal M} U^T =
{\cal M}$, where $U \neq 1$ is a specific unitary matrix such that $U^N$
represents a well-defined discrete symmetry in the $\nu_{e,\mu,\tau}$ basis,
$N$ being a particular integer not necessarily equal to one. I illustrate this
idea with a number of examples, including the realistic case of an inverted
hierarchy of neutrino masses.