title:
A low energy optimization of the CERN-NGS neutrino beam for a theta_{13}
  driven neutrino oscillation search

abstract:
  The possibility to improve the CERN to Gran Sasso neutrino beam performances
for theta_{13} searches is investigated. We show that by an appropriate
optimization of the target and focusing optics of the present CNGS design, we
can increase the flux of low energy neutrinos by about a factor 5 compared to
the current tau optimized focalisation. With the ICARUS 2.35 kton detector at
LNGS and in case of negative result, this would allow to improve the limit to
sin^22 theta_{13} by an order of magnitude better than the current limit of
CHOOZ at Delta m^2 approximately 3 times 10^{-3} eV^2 within 5 years of nominal
CNGS running. This is by far the most sensitive setup of the currently approved
long-baseline experiments and is competitive with the proposed JHF superbeam.


title:
Generalized Boltzmann equations for on-shell particle production in a
  hot plasma

abstract:
  A novel refinement of the conventional treatment of Kadanoff--Baym equations
is suggested. Besides the Boltzmann equation another differential equation is
used for calculating the evolution of the non-equilibrium two-point function.
Although it was usually interpreted as a constraint on the solution of the
Boltzmann equation, we argue that its dynamics is relevant to the determination
and resummation of the particle production cut contributions. The differential
equation for this new contribution is illustrated in the example of the cubic
scalar model. The analogue of the relaxation time approximation is suggested.
It results in the shift of the threshold location and in smearing out of the
non-analytic threshold behaviour of the spectral function. Possible
consequences for the dilepton production are discussed.


title: Explicit seesaw with nearly bimaximal neutrino mixing and no LSND effect

abstract:
  An explicit model of neutrino texture is presented, where in the 6 times 6
mass matrix the Majorana lefthanded component is zero, the Majorana righthanded
component - diagonal with equal entries, and the Dirac component gets a
hierarchical structure, deformed by nearly bimaximal mixing. If the Majorana
righthanded component dominates over the Dirac component, the familiar seesaw
mechanism leads effectively to the popular, nearly bimaximal oscillations of
active neutrinos. The Dirac component, before its deformation, may be similar
in shape to the charged-lepton and quark mass matrices. Then, parameters for
solar and atmospheric neutrinos may be related to each other, predicting from
the SuperKamiokande value of Delta m_{32}^2 a tiny Delta m_{21}^2, typical for
MSW LOW solar solution (rather than for MSW Large Mixing Angle solution).


title:
Flavor changing t -> c l_1^- l_2^+ decay in the general two Higgs
  doublet model

abstract:
  We study the flavor changing t-> c l_1^- l_2^+ decay in the framework of the
general two Higgs doublet model, the so called model III. We predict the
branching ratio for l_1=\tau, l_2=\mu at the order of magnitude of BR \sim
10^{-8}.


title: Quantum gravity as a consistent local field theory

abstract:
  We show that the Einstein-Hilbert action for the gravitational field can be
obtained as a linear low-energy approximation for the dynamical massless fields
in the theory with the lagrangian quadratic in the gauge field strength-tensor
of spin connection under the spontaneous breaking of symmetry with a vacuum
state described by an ansatz for nontrivial background strength-tension.


title:
The Transversity Function and Double Spin Azimuthal Asymmetry in
  Semi-Inclusive Pion Leptoproduction

abstract:
  We show that the transverse momentum dependent transversity function is
proportional to the longitudinal polarization of a quark in a transversely
polarized proton. This result suggests an alternative, convenient method for
determining transversity, without knowing unusual fragmentation functions. The
method consists of measuring the double spin azimuthal asymmetry in
semi-inclusive pion leptoproduction by a transversely polarized proton target.
The asymmetry, which is twist 3, is estimated to be more than 10% under the
most favorable conditions. The experiment we suggest is feasible at facilities
like DESY and CERN.


title: Extra Dimensions and Varying Alpha

abstract:
  I review recent constraints on and claimed detections of a time-varying
fine-structure constant $\alpha$. Our results are consistent with no variation
in $\alpha$ from the epoch of recombination to the present day, and restrict
any such variation to be less than about 4%. The forthcoming MAP and Planck
experiments will be able to break most of the currently existing degeneracies
between $\alpha$ and other cosmological parameters, and measure $\alpha$ in the
early universe with an accuracy comparable to current claimed recent-universe
detections.


title: Special case of sunset: reduction and epsilon-expansion

abstract:
  We consider two loop sunset diagrams with two mass scales m and M at the
threshold and pseudotreshold that cannot be treated by earlier published
formula. The complete reduction to master integrals is given. The master
integrals are evaluated as series in ratio m/M and in epsilon with the help of
differential equation method. The rules of asymptotic expansion in the case
when q^2 is at the (pseudo)threshold are given.


title: Delta --> N gamma in Large-Nc QCD

abstract:
  The decay Delta^+ --> p gamma is studied in the 1/N_c expansion of QCD. The
ratio of the helicity amplitudes is determined to be A_{3/2}/A_{1/2} = \sqrt{3}
+ O(1/N_c^2). Equivalently, the ratio E2/M1 of the multipole amplitudes is
predicted to be order 1/N_c^2.


title:
Ability to Count to Two. Opening Talk at the Third International
  Sakharov Conference on Physics

abstract:
  Third International Sakharov Conference on Physics organized by the
Theoretical Physics Department of the Lebedev Institute, Russian Academy of
Sciences, covered wide scope of topics: astrophysics, fusion, high field, high
pressure and high density research, superstrings and dualities, brane world and
quantum gravity, quantum field theory and high energy physics. This short
Opening Word however exceeds the bounds of physics - it is about three
"dynamical characteristics" of Sakharov's methodology and way of thinking:
"Artseulov method", "a permanent feeling of possible personal error", and
ability "to count to two", which in present days is not less demanded than
before.


title: Flow Equations without Mean Field Ambiguity

abstract:
  We compare different methods used for non-perturbative calculations in
strongly interacting fermionic systems. Mean field theory often shows a basic
ambiguity related to the possibility to perform Fierz transformations. The
results may then depend strongly on an unphysical parameter which reflects the
choice of the mean field, thus limiting the reliability. This ambiguity is
absent for Schwinger-Dyson equations or fermionic renormalization group
equations. Also renormalization group equations in a partially bosonized
setting can overcome the Fierz ambiguity if the truncation is chosen
appropriately. This is reassuring since the partially bosonized renormalization
group approach constitutes a very promising basis for the explicit treatment of
condensates and spontaneous symmetry breaking even for situations where the
bosonic correlation length is large.


title: Probing New Physics with b -> s\gamma Decays

abstract:
  In the Standard Model, the photon emitted in b->s\gamma decays is predicted
to be left-handed polarized. We discuss the types of New Physics which can
produce a deviation from this prediction, focusing on the Minimal
Supersymmetric Standard Model. A new method is proposed for testing these
predictions, which makes use of angular correlations in exclusive B ->
K\pi\pi\gamma decays.


title: Deviation of Neutrino Mixing from Bi-maximal

abstract:
  We have studied how observables of the neutrino mixing matrix can link up
with the ones in the quark sector. The deviation from the bi-maximal flavor
mixing is parameterized using a 3 x 3 unitary matrix. The neutrino mixings are
investigated supposing this unitary matrix to be hierarchical like the quark
mixing matrix. We obtain the remarkable prediction |U_{e3}| >= 0.03 from the
experimentally allowed range tan^2 theta_{sol} = 0.24 ~ 0.89. The CP violation
in neutrino oscillations is expected to be very small.


title: Remarks on the compactified six-dimensional model of a particle

abstract:
  Non-homogeneous gauge ground state solutions in a six-dimensional gauge model
in the presence of non-zero extended fermionic charge density fluctuations are
reviewed and fully reinterpreted.


title: Saxion Emission from SN1987A

abstract:
  We study the possibility of emission of the saxion, a superpartner of the
axion, from SN1987A. The fact that the observed neutrino pulse from SN1987A is
in excellent agreement with the current theory of supernovae places a strong
bound on the energy loss into any non-standard model channel, therefore
enabling bounds to be placed on the decay constant, f_a, of a light saxion. The
low-energy coupling of the saxion, which couples at high energies to the QCD
gauge field strength, is expected to be enhanced from QCD scaling, making it
interesting to investigate if the saxion could place stronger bounds on f_a
than the axion itself. Moreover, since the properties of the saxion are
determined by f_a, a constraint on this parameter can be translated into a
constraint on the supersymmetry breaking scale. We find that the bound on f_a
from saxion emission is comparable with the one derived from axion emission due
to a cancellation of leading-order terms in the soft-radiation expansion.


title:
Single-spin asymmetry in pion production in polarized proton-proton
  collisions and odderon

abstract:
  Single-spin asymmetry appears due to the interference of single and double
gluon exchange between protons. A heavy fermion model is used to describe the
jet production in the interaction of gluon with the proton implying the further
averaging over its mass. As usually in one-spin correlations, the imaginary
part of the double gluon exchange amplitude play the relevant role. The
asymmetry in the inclusive set-up with the pion tagged in the fragmentation
region of the polarized proton does not depend on the center of mass energy in
the limits of its large values. The lowest order radiative corrections to the
polarized and unpolarized contributions to the differential cross sections are
calculated in the leading logarithmical approximation. In general, a
coefficient at logarithm of the ratio of cms energy to the pion mass depends on
transversal momentum of the pion. This ratio of the lowest order contribution
to the asymmetry may be interpreted as the partial contribution to the odderon
intercept. The ratio of the relevant contributions in the unpolarized case can
be associated with the partial contribution to the pomeron intercept. The
numerical results given for the model describe the jet as a heavy fermion decay
fragments.


title:
Need the masses of unstable particles and their antiparticles be equal
  in the CPT--invariant system?

abstract:
  We show that the real parts of diagonal matrix elements of the exact
effective Hamiltonian governing the time evolution in the subspace of states of
neutral kaons and similar particles can not be equal for $t > t_{0}$ ($t_{0}$
is the instant of creation of the pair $K_{0}, {\bar{K}}_{0}$) when the total
system under consideration is CPT invariant but CP noninvariant. The unusual
consequence of this result is that, contrary to the properties of stable
particles, the masses of the unstable particle, e.g.. $K_{0}$, and its
antiparticle, ${\bar{K}}_{0}$, need not be equal for $t \gg t_{0}$ in the case
of preserved CPT and violated CP symmetries.


title: The CKM Matrix and The Unitarity Triangle: Another Look

abstract:
  The unitarity triangle can be determined by means of two measurements of its
sides or angles. Assuming the same relative errors on the angles
$(\alpha,\beta,\gamma)$ and the sides $(R_b,R_t)$, we find that the pairs
$(\gamma,\beta)$ and $(\gamma,R_b)$ are most efficient in determining
$(\bar\varrho,\bar\eta)$ that describe the apex of the unitarity triangle. They
are followed by $(\alpha,\beta)$, $(\alpha,R_b)$, $(R_t,\beta)$, $(R_t,R_b)$
and $(R_b,\beta)$. As the set $\vus$, $\vcb$, $R_t$ and $\beta$ appears to be
the best candidate for the fundamental set of flavour violating parameters in
the coming years, we show various constraints on the CKM matrix in the
$(R_t,\beta)$ plane. Using the best available input we determine the universal
unitarity triangle for models with minimal flavour violation (MFV) and compare
it with the one in the Standard Model. We present allowed ranges for $\sin
2\beta$, $\sin 2\alpha$, $\gamma$, $R_b$, $R_t$ and $\Delta M_s$ within the
Standard Model and MFV models. We also update the allowed range for the
function $F_{tt}$ that parametrizes various MFV-models.


title: Cosmological Higgs fields

abstract:
  We present a time-dependent solution to the coupled Einstein-Higgs equations
for general Higgs-type potentials in the context of flat FRW cosmological
models. Possible implications are discussed.


title: Extraction of the Generalized Parton Distribution H(xi,xi,t) from DVCS

abstract:
  A simple way to extract the Generalized Parton Distribution H(xi,xi,t) at
small t from the single beam-spin asymmetry in Deeply Virtual Compton
Scattering is proposed. Projections are given for future measurements at the
HERMES experiment upgraded with a recoil detector.


title: Twist cut-off for scalar off-cone operators in q-space

abstract:
  We show that the twist decomposition of non-local scalar off-cone
QCD-operators, which in $x-$space is infinite, after Fourier transformation
with the singular functions $1/(x^2 - {\text{i}} \epsilon)^\lambda$ for
$\lambda = 1$ and 2 terminates at leading and sub-leading twist, respectively.
Therefore, only a finite number of twists contribute to the target mass
corrections of light-cone dominated scattering processes. Their explicit
expressions may be read off directly from the twist decomposition in $x-$space.


title: Polarized Parton Distributions in the Valon Model

abstract:
  We calculated the polarized parton distributions in leading order
approximation in QCD from valon model. Polarized structure function of the
nucleon are analyzed in the polarized valon model in which a nucleon is assumed
to be a bound state of three polarized valence quark cluster(valons). It is
shown that the results of the model calculation agree rather well with the SMC
and available experimental data . Our results for $\Gamma_{1}$ of hadron and
deuteron are in good agreement with experimental data for some value of
$Q^{2}$.


title: The reliability of pQCD approach in pion electromagnetic form factor

abstract:
  The pion electromagnetic form factor with leading and next-to-leading twist
corrections are studied in the framework of pQCD approach. We find that, at
small momentum transfer regions, Sudakov effects cannot provide a strong enough
suppression of the non-perturbative contributions coming from large transverse
separations, but at large momentum transfer region, non-perturbative
contributions can be effectively suppressed. So pQCD approach can be applied at
large momentum transfer region. At the energy region where experiment can
access so far, i.e. Q < 4GeV, pQCD prediction can not be precise because there
may be a quite large part of contributions coming from non-perturbative region.
The calculation of power corrections may not be performed systematically in
pQCD framework.


title: A Model for the Pion Structure Function

abstract:
  The pion structure function is investigated in a simple model, where pion and
constituent quark fields are coupled through the simplest pseudoscalar
coupling. The imaginary part of the forward gamma* pi-> gamma* pi scattering
amplitude is evaluated and related to the structure functions. It is shown that
the introduction of non-perturbative effects, linked to the size of the pion
and preserving gauge invariance, allows a connection with the quark
distribution. It is predicted that higher-twist terms become negligible for Q2
larger than about 2 GeV2 and that quarks in the pion have a momentum fraction
smaller than in the proton case.


title:
CP Violation in the B System and Relations to $K\to\pi\nu\bar{\nu}$
  Decays

abstract:
  A review of CP violation in the $B$ system and strategies to determine the
unitarity triangle of the CKM matrix is given. We begin with an introduction to
the description of CP violation in the Standard Model of electroweak
interactions, and discuss the basic features of the theoretical framework to
deal with non-leptonic B decays, which play the main role in this review. After
a brief look at CP violation in the kaon system and a discussion of the rare
decays $K^+\to\pi^+\nu\bar{\nu}$ and $K_L\to\pi^0\nu\bar{\nu}$, we turn to the
formalism of $B^0_{d,s}$--$\bar{B^0_{d,s}}$ mixing, allowing us to explore
important $B$-factory benchmark modes and the $B_s$-meson system. We then focus
on charged B decays, $B\to\pi K$ modes and the phenomenology of $U$-spin
related B decays, including the $B_d\to\pi^+\pi^-$, $B_s\to K^+K^-$ system.
Finally, we discuss a particularly simple -- but very predictive -- scenario
for new physics, which is provided by models with ``minimal flavour
violation''. In this framework, various bounds can be derived and interesting
connections between the $B$ system and the rare kaon decays
$K^+\to\pi^+\nu\bar{\nu}$ and $K_L\to\pi^0\nu\bar{\nu}$ arise.


title: Role of quantum fluctuations at high energies

abstract:
  We investigate an influence of virtual particles on the classical motion of a
system in Minkowski and Euclidean spaces. Our results indicate that
fluctuations of fields different from the main field decelerate significantly
its motion at high energies. The formalism described here is applicable to the
majority of inflationary models. We show also that the quantum fluctuations
suppress false vacuum decay in first-order phase transitions at high energies.


title: Bimaximal Neutrino Mixixing from a Local SU(2) Horizontal Symmetry

abstract:
  Freedom from global anomalies in the presence of a local SU(2)_H horizontal
symmetry under which right handed charged leptons transform nontrivially
requires that there be at least two right handed neutrinos with masses of order
of the horizontal symmetry breaking scale. If a third right handed neutrino is
introduced to satisfy quark lepton symmetry, it is unprotected by the
horizontal symmetry, becomes superheavy with a Planck scale mass and decouples
from lower energy physics. The resulting seesaw mechanism with two right handed
neutrinos in combination with the horizontal symmetry leads naturally to a near
bimaximal pattern for the neutrino mixing with an inverted mass hierarchy and
is compatible with all data. It predicts a correlation between the solar mixing
angle and U_{e3}, that is testable in the proposed long baseline experiments.


title: QCD, diffraction and string theory

abstract:
  Recently, string theory on some specific curved backgroud spacetime
geometries has been conjectured to be equivalent to certain gauge theories
(AdS/CFT correspondence). This correspondence may be used to investigate the
non-perturbative regime of gauge theories. I describe its application to the
study of soft scattering amplitudes in a confining gauge theory. I describe two
qualitatively different applications: amplitudes with vacuum quantum number
exchange (Pomeron-like), amplitudes with Reggeon exchange. The last case
requires going beyond eikonal approximation on the gauge theory side.


title: Effective String Theory of Dual Superconductivity

abstract:
  We show how an effective field theory of long distance QCD, describing a dual
superconductor, can be expressed as an effective string theory of
superconducting vortices. We use the semiclassical expansion of this effective
string theory about a classical rotating string solution in any spacetime
dimension D to obtain the semiclassical meson energy spectrum. For D=26, it
formally coincides with the energy spectrum of the open string in classical
Bosonic string theory. However, its physical origin is different. It is a
semiclassical spectrum of an effective string theory valid only for large
values of the angular momentum. For D=4, the first semiclassical correction
adds the constant 1/12 to the classical Regge formula for the angular momentum
of mesons on the leading Regge trajectory.


title: Effects on Higgs Boson Properties From Radion Mixing

abstract:
  We discuss how mixing between the Standard Model Higgs boson, $h$, and the
radion of the Randall-Sundrum model can lead to significant shifts in the
expected properties of the Higgs boson. In particular we show that the total
and partial decay widths of the Higgs, as well as the $h\to gg$ branching
fraction, can be substantially altered from their SM expectations, while the
remaining branching fractions are modified less than $\lsim 5%$ for most of the
parameter space volume. Precision measurements of Higgs boson properties at at
a Linear Collider are shown to probe a large region of the Randall-Sundrum
model parameter space.


title:
Precision Determination of Heavy Quark Masses and the Strong Coupling
  Constant

abstract:
  We present a new QCD sum rule with high sensitivity to the continuum regions
of charm and bottom quark pair production. Combining this sum rule with
existing ones yields very stable results for the MS-bar quark masses, m_c(m_c)
and m_b(m_b). We introduce a phenomenological parametrization of the continuum
interpolating smoothly between the pseudoscalar threshold and asymptotic quark
regions. Comparison of our approach with recent BES data allows for a robust
theoretical error estimate. The parametric uncertainty due to alpha_s is
reduced by performing a simultaneous fit to the most precise sum rules and
other high precision observables. This includes a new evaluation of the
lifetime of the tau lepton, tau_tau, serving as a strong constraint on alpha_s.
Our results are m_c(m_c) = 1.289 +0.040 -0.045 GeV, m_b(m_b) = 4.207 +0.030
-0.031 GeV (with a correlation of 29%), and alpha_s(M_Z) [tau_tau] = 0.1221
+0.0026 -0.0023.


title: Scattering amplitudes at finite temperature

abstract:
  We present a simple set of rules for obtaining the imaginary part of a self
energy diagram at finite temperature in terms of diagrams that correspond to
physical scattering amplitudes.


title: Direct Urca processes on nucleons in cooling neutron stars

abstract:
  We use the field theoretical model to perform relativistic calculations of
neutrino energy losses caused by the direct Urca processes on nucleons in the
degenerate baryon matter. By our analysis, the direct neutron decay in the
superdense nuclear matter under beta equilibrium is open only due to the
isovector meson fields, which create a large energy gap between protons and
neutrons in the medium. Our expression for the neutrino energy losses, obtained
in the mean field approximation, incorporates the effects of nucleon recoil,
parity violation, weak magnetism, and pseudoscalar interaction. For numerical
testing of our formula, we use a self-consistent relativistic model of the
multicomponent baryon matter. The relativistic emissivity of the direct Urca
reactions is found substantially larger than predicted in the non-relativistic
approach. We found that, due to weak magnetism effects, relativistic
emissivities increase by approximately 40-50%, while the pseudoscalar
interaction only slightly suppresses the energy losses, approximately by 5%.


title:
CP violation in charged Higgs boson decays in the MSSM with complex
  parameters

abstract:
  Supersymmetric loop contributions can lead to different decay rates of H+\to
t\bar b and H-\to b\bar t. We calculate the decay rate asymmetry \delta^CP =
\frac{\Gamma(H+\to t\bar b)-\Gamma(H-\to b\bar t)}{{\Gamma(H+\to t\bar
b)+\Gamma(H-\to b\bar t)} at next-to-leading order in the MSSM with complex
parameters. We analyse the parameter dependence of \delta^CP with emphasis on
the phases of A_t and A_b. It turns out that the most important contribution
comes from the loop with stop, sbottom, and gluino. If this contribution is
present, \delta^CP can go up to 10-15%.


title: GPDs, form factors and Compton scattering

abstract:
  The basic theoretical ideas of the handbag factorization and its application
to wide-angle scattering reactions are reviewed. With regard to the present
experimental program carried out at JLab, wide-angle Compton scattering is
discussed in some detail.


title: Kamlah Expansion and Gauge Theories

abstract:
  In Yang-Mills theories, variational calculations of the Rayleigh-Ritz type
face the problem that on the one hand, calculability puts severe constraints on
the space of test wave functionals; on the other hand, the test wave
functionals have to be gauge invariant. The conflict between the two
requirements can be resolved by introducing a projector. In this paper we
present an approach to approximating the projector in a way known and
successfully employed in nuclear physics: the Kamlah expansion. We discuss it
both for electrodynamics and for Yang-Mills theories to leading order in a
perturbative expansion, and demonstrate that the results are compatible with
what one would expect from perturbation theory.


title:
Large-$p_T$ Inclusive $\pi^0$ Production in Heavy-Ion Collisions at RHIC
  and LHC

abstract:
  We present results for the large-$p_T$ inclusive $\pi^0$ production in p-p
and A-A collisions at RHIC and LHC energies. We include the full
next-to-leading order radiative corrections, $O(\alpha_s^3)$, and nuclear
effects such as parton energy loss and nuclear shadowing. We find the
next-to-leading order corrections and the parton energy loss effect to be large
and $p_T$ dependent, while the nuclear shadowing effects are small ($< 10%$).
We calculate the ratio of prompt photons to neutral pions produced in heavy ion
collisions and show that at RHIC energies this ratio increases with $p_T$
approaching one at $p_T \sim 8$ GeV, due to the large suppression of $\pi^0$
production. We show that at the LHC, this ratio has a steep $p_T$ dependence
and approaches 25% effect at $p_T \sim 40$ GeV. We discuss theoretical
uncertainties inherent in our calculation, such as choice of the
renormalization, factorization and fragmentation scales and the K-factors which
signify the size of higher-order corrections.


title: Physics reach of rare b-decays

abstract:
  I discuss the theoretical and empirical status of $b \to s \gamma$, $b \to s
\ell^+ \ell^-$ decays, as well as their future prospects. I emphasize those
observables in rare $b$-decays which can potentially establish new physics and
distinguish between extensions of the Standard Model. I briefly review current
models of electroweak symmetry breaking, all of which can carry interesting
flavor characteristics accessible with $b$-physics experiments.


title: F(1) for B -> D^*l\nu from Lattice QCD

abstract:
  Short description of our calculation of the form factor needed to determine
CKM element |V_{cb}| from the exclusive decay B -> D^*l\nu. For full details,
see hep-ph/0110253. Also, here we recommend distribution for CKM fits.


title: Electroweak Data and the Higgs Boson Mass: A Case for New Physics

abstract:
  Because of two 3 sigma anomalies, the Standard Model (SM) fit of the
precision electroweak data has a poor confidence level, CL= 0.010. Since both
anomalies involve challenging systematic issues, it might appear that the SM
could still be valid if the anomalies resulted from underestimated systematic
error. Indeed the CL of the global fit could then increase to 0.65, but that
fit predicts a small Higgs boson mass, m_H=43 GeV, that is only consistent at
CL=0.035 with the lower limit, m_H > 114 GeV, established by direct searches.
The data then favor new physics whether the anomalous measurements are excluded
from the fit or not, and the Higgs boson mass cannot be predicted until the new
physics is understood. Some measure of statistical fluctuation would be needed
to maintain the validity of the SM, which is unlikely by broad statistical
measures. New physics is favored, but the SM is not definitively excluded.


title: Quest For Unification

abstract:
  The GUT-based approach to physics has been attractive since it was first put
forward close to thirty years ago; it has been enriched by new ideas, notably
supersymmetry and strings; and there are real hints that it is on the right
track, notably from measurements of the weak mixing angle and neutrino masses.
In this article (based on my Heinrich Hertz lecture at SUSY 2002 at DESY, June,
2002), some of the arguments for grand unification will be reviewed.


title: Kaluza-Klein Dark Matter

abstract:
  We propose that cold dark matter is made of Kaluza-Klein particles and
explore avenues for its detection. The lightest Kaluza-Klein state is an
excellent dark matter candidate if standard model particles propagate in extra
dimensions and Kaluza-Klein parity is conserved. We consider Kaluza-Klein gauge
bosons. In sharp contrast to the case of supersymmetric dark matter, these
annihilate to hard positrons, neutrinos and photons with unsuppressed rates.
Direct detection signals are also promising. These conclusions are generic to
bosonic dark matter candidates.


title: Relating bottom quark mass in DR-bar and MS-bar regularization schemes

abstract:
  The value of the bottom quark mass at M_Z in the DR-bar scheme is an
important input for the analysis of supersymmetric models with a large value of
tan(beta). Conventionally, however, the running bottom quark mass extracted
from experimental data is quoted in the MS-bar scheme at the bottom mass scale.
We describe a two loop procedure for the conversion of the bottom quark mass
from MS-bar to DR-bar scheme. The Particle Data Group value m_b(m_b) = 4.2 \pm
0.2 GeV in the MS-bar scheme corresponds to a range of 2.65-3.03 GeV for
m_b(M_Z) in the DR-bar scheme.


title:
Revisiting pion electromagnetic form factor in perturbative QCD approach
  and its reliability

abstract:
  Again, this preprint has been combined with hep-ph/0207106, which is
co-authored by both of us. Therefore, this preprint has been withdrawn. Readers
are welcome to refer to hep-ph/0207106.


title:
Generalized Schwinger proper time method for Dirac operator with
  dynamical chiral symmetry breaking

abstract:
  Schwinger proper time method is generalized for the calculation of real part
of determinant and coincidence limit of inverse for Dirac operator with
dynamical chiral symmetry breaking caused by momentum dependent fermion self
energy $\Sigma(k^2)$. The obtained series generalizes the heat kernel expansion
for hard fermion mass.


title: Exploring the Micro-Structure of the Proton: from Form Factors to DVCS

abstract:
  For a long time people made the mistake of thinking the proton was
understood. New experiments, ranging from form factors to deeply virtual
Compton scattering, promise a new era of highly informative studies. Among the
controversial topics of the future may be such basic features as the physical
size of the proton, the role of quark orbital angular momentum, and the
possibility of making "femto-photographic" images of hadronic micro-structure.


title:
Signal Significance in the Presence of Systematic and Statistical
  Uncertainties

abstract:
  The incorporation of uncertainties to calculations of signal significance in
planned experiments is an actual task. Several approaches to this problem are
discussed. We present a procedure for taking into account the systematic
uncertainty related to nonexact knowledge of signal and background cross
sections. A method of a treatment of statistical errors of the expected signal
and background rates is proposed. The interrelation between Gamma- and Poisson
distributions is demonstrated.

categories: hep-ph hep-ex math.PR math.ST physics.data-an stat.TH


title: B -> X_s gamma after completion of the NLO QCD calculations

abstract:
  Several years ago, Stefan Pokorski, Manfred Muenz and us outlined a program
for calculation of the NLO QCD corrections to the weak radiative B meson decay
B -> X_s gamma. Very recently, just before the 60th birthday of Stefan
Pokorski, this program has been formally completed. In the present paper, we
summarize the existing results and discuss perspectives for further improvement
of the accuracy of the Standard Model prediction for BR[ B -> X_s gamma].


title: Self-consistent model of fermions

abstract:
  A composite model of the fundamental fermions based on colour preons is
discussed. It is found that, if endowed with the pairwise
(repulsive/attractive) chromoelectric fields, preons would cohere in a series
of structures, resembling by their properties the three generations of the
fundamental fermions. The model is self-consistent in the sense that it makes
no use of free or experimental input parameters.


title: SUSY In The Sky: Observing Ultra-High Energy Cosmic Neutralinos

abstract:
  In models where the ultra-high energy cosmic ray problem is solved by
top-down scenarios, a significant flux of ultra-high energy neutralinos is
predicted. We calculate the number of events expected from such particles in
future experiments such as EUSO or OWL. We show that by using the Earth as a
filter, showers generated by neutralinos can be separated from neutrino
generated showers. We find that for many models, observable rates are expected.


title:
Exclusive Semileptonic Decays of B Mesons to Orbitally and Radial
  Excited D

abstract:
  In this paper we compute, within in the context of a relativistic quark
model, the Isgur-Wise functions for exclusive semileptonic $\bar B \to X_c$
decays, where $X_c$ is any charmed mesons with total spin $J=0,1,2$ or one of
their first excited states. The relevant matrix elements are computed by a
direct numerical integration, in coordinate space, of the convolution of the
wave function of the $B$ meson at rest and the wave function of the $X_c$
meson, boosted according with its recoil factor. Our results are compared with
other predictions found in the existing literature.


title:
Description of Deconfinement at Finite Matter Density in a Generalized
  Nambu--Jona-Lasinio Model

abstract:
  Recent years have seen extensive applications of the Nambu--Jona-Lasinio
(NJL) model in the study of matter at high density. There is a good deal of
interest in the predictions of diquark condensation and color
superconductivity, with suggested applications to the study the properties of
neutron stars. As the researchers in this field note, the NJL model does not
describe confinement, so that one is limited to the study of the deconfined
phase, which may set in at several times nuclear matter density. Recently, we
have extended the NJL model to include a covariant confinement model. In the
present work our goal is to include a phenomenological model of deconfinement
at finite matter density, using some analogy to what is known concerning
"string breaking" and deconfinement at finite temperature. Various models may
be used, but for this work we choose a specific model for the density
dependence of the parameters of our confining interaction. We perform
relativistic random-phase-approximation (RPA) calculations of the properties of
the $\pi(138), K(495), f_0(980), a_0(980)$ and $K_0^*(1430)$ mesons and their
radial excitations. In the model chosen for this work, there are no mesonic
states beyond about $2\rho_{NM}$, where $\rho_{NM}$ is the density of nuclear
matter. This inability of the model to support hadronic excitations at large
values of the density is taken as a signal of deconfinement. In addition to the
density dependence of the confining interaction, we use the density-dependent
quark mass values obtained in either the SU(2) or SU(3)-flavor versions of the
NJL model.


title: Tau Decays to Mu + Eta in Supersymmetric Models

abstract:
  The existence of large \nu_\mu-\nu_\tau mixing suggests the likelihood of
large smuon-stau mixing in supersymmetric models, leading to \mu and \tau
number violation. In addition to interesting signatures in slepton and
neutralino production and decay, this will lead to rare \tau decays, such as
\tau --> mu \gamma. Recently, it has been pointed out that the \tau --> 3\mu
branching ratio could be substantial in the large \tan\beta region of parameter
space, due to an induced \mu-\tau-Higgs vertex. In this paper, another
signature, \tau --> \mu \eta is considered. In the large \tan\beta region, it
is shown that the branching ratio of \tau --> \mu \eta is 8.4 times the
branching ratio of \tau --> 3\mu, independent of any unknown parameters, and it
will thus give the most stringent bound on Higgs-mediated lepton flavor
violation, and may provide its first signature. In the other regions of
parameter space, where \tau --> \mu \gamma is the most prominent decay, the
branching ratio for \tau --> \mu \eta is always substantially lower.


title:
Neutrino Oscillations Due to Nonuniversal Gauge Interactions in the Weak
  Sector

abstract:
  We discuss the structure of the neutrino mass matrix as derived from a
nonuniversal electroweak gauge interaction model. We discuss two interesting
patterns of neutrino masses. The first pattern is hierarchal which fits the LMA
or LOW solutions of solar neutrino data. The second pattern gives rise to
inverted mass spectrum which fits the currently not preferred SMA solution. The
mechanism for generating a light sterile neutrino mass is interesting and is
briefly discussed.


title: Topics on heavy baryon chiral perturbation theory in the large N_c limit

abstract:
  We compute nonanalytical pion-loop corrections to baryon masses in a combined
expansion in chiral symmetry breaking and 1/N_c, where N_c is the number of
colors. Specifically, we compute flavor-27 baryon mass splittings at leading
order in chiral perturbation theory. Our results, at the physical value N_c=3,
are compared with the expressions obtained in heavy baryon chiral perturbation
theory with no 1/N_c expansion.


title: Neutrino Bounds on Astrophysical Sources and New Physics

abstract:
  Ultra-high energy cosmic neutrinos are incisive probes of both astrophysical
sources and new TeV-scale physics. Such neutrinos would create extensive air
showers deep in the atmosphere. The absence of such showers implies upper
limits on incoming neutrino fluxes and cross sections. Combining the exposures
of AGASA, the largest existing ground array, with the exposure of the Fly's Eye
fluorescence detector integrated over all its operating epochs, we derive 95%
CL bounds that substantially improve existing limits. We begin with
model-independent bounds on astrophysical fluxes, assuming standard model cross
sections, and model-independent bounds on new physics cross sections, assuming
a conservative cosmogenic flux. We then derive model-dependent constraints on
new components of neutrino flux for several assumed power spectra, and we
update bounds on the fundamental Planck scale M_D in extra dimension scenarios
from black hole production. For large numbers of extra dimensions, we find M_D
> 2.0 (1.1) TeV for \mbhmin = M_D (5 M_D), comparable to or exceeding the most
stringent constraints to date.


title: Mass Corrections and Neutrino DIS

abstract:
  Including the effects of the ${\cal{O}}(\gtrsim 1 {\rm GeV})$ masses of the
charm quark, $\tau$ lepton and target nucleon in DIS phenomenology is discussed
with applications to CC neutrino DIS: Neutrino data for $F_2$ are revisited
within the global analysis framework. A fully differential calculation refines
the CC charm production process as a gate to extract $\{s(x), {\bar s} (x) \}$.
New results are presented for a "heavy quark" version of the CTEQ6 set of PDFs
and for ($\nu_{\mu} \to \nu_{\tau}$ oscillation-signal) $\tau$ neutrino cross
sections.


title: QCD String Structure in Vector Confinement

abstract:
  We demonstrate that the Nambu-Goto string spectroscopy with massless quarks
is replicated in highly excited states of the linear vector confinement
potential. For deep radial excitations we observe that the Regge slope, spacing
between daughter trajectories, and absolute state energies agree with those of
the QCD string.


title: Two-loop QCD calculations in the eikonal approximation

abstract:
  I discuss recent progress in the calculation of two-loop QCD corrections in
the eikonal approximation. I present specific results for the UV structure of
the corrections.


title: Assisted Tachyonic Inflation

abstract:
  The model of inflation with a single tachyon field generates larger
anisotropy and has difficulties in describing the formation of the Universe .
In this paper we consider a model with multi tachyon fields and study the
assisted inflationary solution. Our results show that this model satisfies the
observation.


title: Stars and Fundamental Physics

abstract:
  Stars are powerful sources for weakly interacting particles that are produced
by nuclear or plasma processes in their hot interior. These fluxes can be used
for direct measurements (e.g. solar or supernova neutrinos) or the
back-reaction on the star can be used to derive limits on new particles. We
discuss two examples of current interest, the search for solar axions by the
CAST experiment at CERN and stellar-evolution limits on the size of putative
large extra dimensions.


title: Transdimensional physics and inflation

abstract:
  Within the framework of a five-dimensional brane world with a stabilized
radion, we compute the cosmological perturbations generated during inflation
and show that the perturbations are a powerful tool to probe the physics of
extra dimensions. While we find that the power spectrum of scalar perturbations
is unchanged, we show that the existence of the fifth dimension is imprinted on
the spectrum of gravitational waves generated during inflation. In particular,
we find that the tensor perturbations receive a correction proportional to
$(HR)^2$, where $H$ is the Hubble expansion rate during inflation and $R$ is
the size of the extra dimension. We also generalize our findings to the case of
several extra dimensions as well as to warped geometries.


title: Hard thermal loops with a background plasma velocity

abstract:
  I consider the calculation of the two and three-point functions for QED at
finite temperature in the presence of a background plasma velocity. The final
expressions are consistent with Lorentz invariance, gauge invariance and
current conservation, pointing to a straightforward generalization of the hard
thermal loop formalism to this physical situation. I also give the resulting
expression for the effective action and identify the various terms.


title: QCD tests through hadronic final-state measurements

abstract:
  Modern-day `testing' of (perturbative) QCD is as much about pushing the
boundaries of its applicability as about the verification that QCD is the
correct theory of hadronic physics. This talk gives a brief discussion of a
small selection of topics: factorisation and jets in diffraction, power
corrections and event shapes, the apparent excess of $b$-production in a
variety of experiments, and the matching of event generators and NLO
calculations.


title: Electroweak vector boson production in joint resummation

abstract:
  We study the application of the joint resummation to electroweak boson
production at hadron colliders. The joint resummation formalism resums both
threshold and transverse momentum corrections to the transverse momentum
distribution at next-to-leading logarithmic accuracy. We obtain a good
description of the transverse momentum distribution of Z bosons produced at the
Tevatron collider.


title: The N* Program at Jefferson Lab - Status and Prospects

abstract:
  I discuss recent results on the electroproduction and photoproduction of
mesons in the region of non-strange baryon resonances. Results on the
quadrupole transition from the ground state nucleon to the Delta(1232) show the
importance of pion cloud contributions to explain the observed quadrupole
transition multipoles. The excitation of the "Roper" resonance is being studied
in single pion production using unpolarized cross sections measurements and
beam spin asymmetries. New results on the S_{11}(1535) transition formfactor
give now a consistent picture over a large Q2 range. First results on
electroproduction of p pi^+ pi^- show intruiging resonance structure. which is
difficult to explain in an isobar model fit using known resonance properties,
and may hint at excitation of a "missing" resonance. Searches for resonances in
K^+Lambda also reveal resonance-like behavior. I briefly address a new avenue
of N* physics using exclusive deeply virtual Compton scattering, recently
measured for the first time at JLAB and at DESY.


title: Truly Minimal Unification : Asymptotically Strong Panacea ?

abstract:
  We propose Susy GUTs have a UV attractor at E ~ Lambda_{cU} ~ 10^{17} GeV
where gauge symmetries ``confine'' forming singlet condensates at scales E ~
Lambda_{cU}. The length l_U ~ Lambda_{cU}^{-1} characterizies the size of gauge
non- singlet particles yielding a picture dual to the Dual Standard model of
Vachaspati. This Asymptotic Slavery (AS) fixed point is driven by realistic
Fermion Mass(FM) Higgs content which implies AS. This defines a dynamical
morphogenetic scenario dependent on the dynamics of UV strong N=1 Susy
Gauge-Chiral(SGC) theories. Such systems are already understood in the AF case
but ignored in the AS case. Analogy to the AFSGC suggests the perturbative SM
gauge group of the Grand Desert confines at GUT scales i.e GUT symmetry is
``non-restored''. Restoration before confinement and self-inconsistency are the
two other (less likely) logical possibilities. Truly Minimal (TM) SU(5) and
SO(10) models with matter and FM Higgs only are defined; AM (adjoint multiplet
type) Higgs may be introduced for a Classical Phase Transition (CPT)
description. Renormalizability and R-Parity leave only the low energy (SM) data
as free parameters in the TM (Quantum PT) case. Besides ab initio resolution of
the Heirarchy problem and choice of Susy vacuum, fresh perspectives on particle
elementarity and duality, doublet triplet splitting, proton decay suppression,
soft Susy masses etc open up. ``Elastic'' (spin 2 and spin 3/2) fluctuations of
the AS (or pleromal) condensate coupling universally to SM particles with
length scale l_U ~ l_{Pl} imply an effective N=1 (super)gravity in the Grand
Desert, in which gaugino condensates yield soft Susy breaking. The AF dogma
must be proven or discarded.


title: Possible Studies of Parton Distribution Functions at JHF

abstract:
  We discuss possible studies of parton distribution functions (PDFs) in the
nucleon and nuclei at the Japan Hadron Facility (JHF). First, the PDFs could be
investigated by the 50 GeV primary proton facility. The distributions at medium
x are determined, for example, by Drell-Yan measurements. Second, there are
feasibility studies to propose a neutrino factory within the 50 GeV proton
ring. If such an intensive high-energy neutrino facility is built, neutrino
reactions should be able to provide valuable information on the PDFs, whereas
the current structure functions have been measured mainly for neutrino-iron
reactions.


title:
Charm and bottom quark production in photon-nucleon and photon-photon
  collisions

abstract:
  I discuss mechanisms of heavy quark production in (real) photon-nucleon and
(real) photon - (real) photon collisions. In particular, I focuse on
application of the Saturation Model. In addition to the main dipole-nucleon or
dipole-dipole contribution included in recent analyses, I propose how to
calculate within the same formalism the hadronic single-resolved contribution
to heavy quark production. At high photon-photon energies this yields a
sizeable correction of about 30-40 % for inclusive charm production and 15-20 %
for bottom production.


title: On "dual" parametrizations of generalized parton distributions

abstract:
  We propose a parametrization for the generalized parton distributions (GPDs)
which is based on representation of parton distributions as an infinite series
of t-channel exchanges. The entire generalized parton distribution is given as
an infinite sum over contributions of generalized light-cone distribution
amplitudes in the t-channel. We also discuss the relations of the lowest Mellin
moments of GPDs to basic mechanical characteristics of the nucleon as a
compound system.


title: Impact of SUSY-QCD corrections on top quark decay distributions

abstract:
  We compute the supersymmetric QCD corrections to the decay distribution of
polarized top quarks for the semileptonic decay mode $t(\uparrow)\to b
l^+\nu_l$. As a byproduct, we reinvestigate the SUSY-QCD corrections to the
total decay width $\Gamma(t\to W^+b)$ and resolve a discrepancy between two
previous results in the literature.


title: Quark structure of hadrons and high energy collisions

abstract:
  There exists a large field for phenomenological models in which the knowledge
of the structure of hadrons in terms of QCD constituents obtained from deep
inelastic scatterings is related to their behaviour in soft processes. One of
the simplest and oldest models is the additive quark model, with the rules of
quark statistics following from it. Originally, the relations of quark
combinatorics for hadron yields were based on the qualitative description of a
multiparticle production process as a process of the production of
non-correlated quarks and antiquarks followed by their subsequent fusion into
hadrons [20],[21]. As a large amount of new precision measurements appear, and,
on the other hand, our understanding of QCD becomes deeper, a new level of
understanding of quark-gluon physics in the region of soft interactions forces
us to review the relations of quark combinatorics. To do so, an especially good
possibility is provided by the experimental data for hadronic Z^0 decays which
allow us to check the relations of quark combinatorics for a new type of
processes: quark jets in the decays Z^0 -> q\bar{q} -> hadrons [32].


title:
Update of one-loop corrections for E+ E- --> F anti-F, first run of SANC
  system

abstract:
  We present a description of calculations of the amplitude for E+ E- --> F
anti-F process with account of electroweak and QED one-loop corrections. This
study is performed within the framework of the project SANC. The calculations
are done within the OMS (on-mass-shell) renormalization scheme in two gauges:
in Rxi, which allows an explicit control of gauge invariance by examining
cancellation of gauge parameters and search for gauge-invariant subsets of
diagrams, and in the unitary gauge as a cross-check. The formulae we derived
are realized in two independent FORTRAN codes, eeffLib, which was written in an
old fashioned way, i.e. manually, and another one, created automatically with
an aid of s2n.f (symbols to numbers) software -- a part of SANC system. We
present a comprehensive comparison with the results of the well-known program
ZFITTER for all the light fermion production channels, as well as with the
results existing in the world literature for the process E+ E- --> F anti-F;


title:
Ruling out four-neutrino oscillation interpretations of the LSND
  anomaly?

abstract:
  Prompted by recent solar and atmospheric data, we re-analyze the
four-neutrino description of current global neutrino oscillation data,
including the LSND evidence for oscillations. The higher degree of rejection
for non-active solar and atmospheric oscillation solutions implied by the SNO
neutral current result as well as by the latest 1489-day Super-K atmospheric
neutrino data allows us to rule out (2+2) oscillation schemes proposed to
reconcile LSND with the rest of current neutrino oscillation data. Using an
improved goodness of fit (gof) method especially sensitive to the combination
of data sets we obtain a gof of only 1.6 times 10^{-6} for (2+2) schemes.
Further, we re-evaluate the status of (3+1) oscillations using two different
analyses of the LSND data sample. We find that also (3+1) schemes are strongly
disfavoured by the data. Depending on the LSND analysis we obtain a gof of 5.6
times 10^{-3} or 7.6 times 10^{-5}. This leads to the conclusion that all
four-neutrino descriptions of the LSND anomaly, both in (2+2) as well as (3+1)
realizations, are highly disfavoured. Our analysis brings the LSND hint to a
more puzzling status.


title: Nuclear Effects on the Extraction of $\sin^2\theta_W$

abstract:
  We study the impact of nuclear effects on the extraction of the weak-mixing
angle $\sin^2\theta_W$ from deep inelastic (anti-)neutrino-nucleus scattering,
with special emphasis on the recently announced NuTeV Collaboration 3$\sigma$
deviation of $\sin^2\theta_W$ from its standard model value. We have found that
nuclear effects, which are very important in electromagnetic deep inelastic
scattering (DIS), are quite small in weak charged current DIS. In neutral
current DIS processes, which contain the weak mixing angle, we predict that
these effects play also an important role and may dramatically affect the value
of $\sin^2\theta_W$ extracted from the experimental data.


title: Production of electroweak bosons in e+e- annihilation at high energies

abstract:
  Production of electroweak bosons in e+e- annihilation into quarks and into
leptons at energies much greater than 100 Gev is considered. We account for
double-logarithmic contributions to all orders in electroweak couplings. It is
assumed that the bosons are emitted in the multi-Regge kinematics. The explicit
expressions for the scattering amplitudes of the process are obtained. It is
shown that the cross sections of the photon and Z production have the identical
energy dependence and asymptotically their ratio depends only on the Weinberg
angle whereas the energy dependence of the cross section of the W production is
suppressed by factor s^{-0.4} compared to them.


title: Bounds on Broken R-Parity from NOMAD and CHORUS

abstract:
  We determine new constraints on the products of two R-parity violating
coupling constants from the NOMAD and CHORUS experiments on nu_mu --> nu_tau
oscillations. We obtain improved results from (a) lepton flavour violating
(LFV) meson decays, (b) LFV deep-inelastic scattering and (c) a combination of
the two.


title: Running coupling and BFKL pomeron

abstract:
  We show that in the case of the BFKL pomeron with running coupling the
diffusion pattern is strongly modified and is characterised by the sudden
tunneling transition to the non-perturbative regime. We suggest that by using
the b - expansion method one can suppress the non-perturbative Pomeron and
isolate purely perturbative part of the gluon Green's function.


title: Resonant Transport in Nb/GaAs/AlGaAs/GaAs Microstructures

abstract:
  Resonant transport in a hybrid semiconductor-superconductor microstructure
grown by MBE on GaAs is presented. This structure experimentally realizes the
prototype system originally proposed by de Gennes and Saint-James in 1963 in
\emph{all}-metal structures. A low temperature single peak superimposed to the
characteristic Andreev-dominated subgap conductance represents the mark of such
resonant behavior. Random matrix theory of quantum transport was employed in
order to analyze the observed magnetotransport properties and ballistic effects
were included by directly solving the Bogoliubov-de Gennes equations.


title:
Jet Quenching in High Energy Heavy Ion Collisions by QCD
  Synchrotron-like Radiation

abstract:
  We consider synchrotron-like radiation in QCD by generalizing Schwinger's
treatment of quantum synchrotron radiation in QED to the case of a constant
chromomagnetic field. We suggest a novel mechanism for {\em jet quenching} in
heavy ion collisions, whereby high-$p_t$ partons get depleted through strong
(classical) color fields. The latters are encountered in the color glass
condensate or in the form of expanding shells of exploding sphalerons. Unlike
bremsstrahlung radiation through multiple soft rescattering, synchrotron
radiation converts a jet into a wide shower of soft gluons. We estimate the
energy loss through this mechanism and suggest that it contributes
significantly to the unexpectedly strong jet quenching observed at RHIC.


title:
Deconstructing six dimensional gauge theories with strongly coupled
  moose meshes

abstract:
  It has recently been realized that five dimensional theories can be generated
dynamically from asymptotically free, QCD-like four dimensional dynamics via
``deconstruction.'' In this paper we generalize this construction to six
dimensional theories using a moose mesh with alternating weak and strong gauge
groups. A new ingredient is the appearance of self couplings between the higher
dimensional components of the gauge fields that appear as a potential for
pseudo-Goldstone bosons in the deconstructed picture. We show that, in the
limit where the weak gauge couplings are made large, such potentials are
generated with appropriate size from finite one loop correction. Our
construction has a number of applications, in particular to the constructions
of ``little Higgs'' models of electroweak symmetry breaking.


title: Lifetime Differences in Heavy Mesons With Time Independent Measurements

abstract:
  Heavy meson pairs produced in the decays of heavy quarkonium resonances at e+
e- machines (beauty and tau-charm factories) have the useful property that the
two mesons are in the CP-correlated states. By tagging one of the mesons as a
CP eigenstate, a lifetime difference of heavy neutral meson mass eigenstates
width difference may be determined by measuring the leptonic branching ratio of
the other meson. We discuss the use of this and related methods both in the
case where time dependent mixing is small and when it is significant. We
consider the impact of possible CP-violating effects and present the complete
results for CP-entangled decay rates with CP-violation taken into account.


title: Search for Extra Space-Dimensions at the LHC

abstract:
  The introduction of extra space dimensions in the theory could be an elegant
way tovsolve the hierarchy problem. There could even be one energy scale at
which all interactions could unify. The limits coming from our knowledge of the
gravitation at low distance allow this energy scale to be as low as few TeV.
This situation is extremely interesting experimentally in the context of the
LHC which will cover the range from 100 GeV to few TeV. This article describes
the different analyses developed by the LHC experiments to study this new
phenomenology.


title: Two-loop amplitudes for e+ e- -> q qbar g: the nf-contribution

abstract:
  We discuss the calculation of the nf-contributions to the two-loop amplitude
for e+ e- -> q qbar g. The calculation uses an efficient method based on nested
sums. The result is presented in terms of multiple polylogarithms with simple
arguments, which allow for analytic continuation in a straightforward manner.


title:
Re-examination of Electroweak Symmetry Breaking in Supersymmetry and
  Implications for Light Superpartners

abstract:
  We examine arguments that could avoid light superpartners as an implication
of supersymmetric radiative electroweak symmetry breaking. We argue that, from
the point of view of string theory and standard approaches to generating the
mu-term, cancellations among parameters are not a generic feature. While the
coefficients relating the Z-mass to parameters in the soft supersymmetry
breaking Lagrangian can be made smaller, these same mechanisms lead to lighter
superpartner masses at the electroweak scale. Consequently we strengthen the
implication that gluinos, neutralinos, and charginos are light and likely to be
produced at the Fermilab Tevatron and a linear collider.


title: Radiative corrections to the quark-gluon-Reggeized quark vertex in QCD

abstract:
  This paper is devoted to the calculation of the quark-gluon-Reggeized quark
effective vertex in perturbative QCD in the next-to-leading order. The case of
QCD with massive quarks is considered. This vertex has a number of
applications, in particular, the result can be used for determination of the
next-to-leading correction to the massive Reggeized quark trajectory.


title:
Measurement of $|V_{ub}|$ in semi-inclusive charmless $B \to \pi X$
  decays

abstract:
  We study semi-inclusive charmless decays $B \to \pi X$, where $X$ does not
contain a charm (anti)quark. The mode $\bar B^0 \to \pi^- X$ turns out to be be
particularly useful for determination of the CKM matrix element $|V_{ub}|$. We
present the branching ratio (BR) of $\bar B^0 \to \pi^- X$ as a function of
$|V_{ub}|$, with an estimation of possible uncertainty. The BR is expected to
be an order of $10^{-4}$.


title: Decays $B \to \eta^{\prime} K$ in R-parity violating supersymmetry

abstract:
  In light of the recent experimental data from $B$ factories, We try to
explain the large branching ratio (compared to the Standard Model prediction)
of the decay $B^{\pm}\to \eta' K^{\pm}$ in the context of R-parity violating
($\rpv$) supersymmetry. We investigate other observed $\eta^{(\prime)}$ modes
and find that only two pairs of $\rpv$ coupling can satisfy the requirements
without affecting the other $B \to PP$ and $B \to VP$ decay modes except the
mode $B \to \phi K$. We also calculate the CP asymmetry for the observed decay
modes affected by the new couplings.


title: Neutrino oscillation studies and the neutrino cross section

abstract:
  The present uncertainties in the knowledge of the neutrino cross sections for
E_nu \sim 1 GeV, that is in the energy range most important for atmospheric and
long baseline accelerator neutrinos, are large. These uncertainties do not play
a significant role in the interpretation of existing data, however they could
become a limiting factor in future studies that aim at a complete and accurate
determination of the neutrino oscillation parameters. New data and theoretical
understanding on nuclear effects and on the electromagnetic structure functions
at low Q^2 and in the resonance production region are available, and can be
valuable in reducing the present systematic uncertainties. The collaboration of
physicists working in different subfields will be important to obtain the most
from this available information. It is now also possible, with the facilities
developed for long baseline beams, to produce high intensity and well
controlled neutrino beams to measure the neutrino interaction properties with
much better precision that what was done in the past. Several projects and
ideas to fully exploit these possibilities are under active investigation.
These topics have been the object of the first neutrino interaction (NUINT01)
workshop.


title: On the Triple Pomeron Vertex in Perturbative QCD

abstract:
  We estimate the size of the triple Pomeron vertex in perturbative QCD and
compare with the phenomenological value extracted from Regge fits to
experimental data. For simplicity, the results of the QCD analysis are taken in
the large-N_c limit. We find that the perturbative triple Pomeron coupling is
of the same order of magnitude as the observed one. We also estimate the size
of the Pomeron self energy and its contribution to the renormalization of the
Pomeron intercept. The effect is very small, in agreement with previous
nonperturbative estimates.


title:
Overall Feature of CP dependence for Neutrino Oscillation Probability in
  Arbitrary Matter Profile

abstract:
  We study the CP dependence of neutrino oscillation probability for all
channels in arbitrary matter profile within three generations. We show that an
oscillation probability for \nu_e \to \nu_\mu can be written in the form
P(\nu_e \to \nu_\mu) =A_{e\mu} cos \delta + B_{e\mu} sin \delta + C_{e\mu}
without any approximation using the CP phase \delta. This result holds not only
in constant matter but also in arbitrary matter. Another probability for
\nu_\mu \to \nu_\tau can be written in the form P(\nu_\mu \to \nu_\tau)=
A_{\mu\tau} cos \delta + B_{\mu\tau} sin \delta
  + C_{\mu\tau} + D_{\mu\tau} cos 2\delta + E_{\mu\tau} sin 2\delta. The term
which is proportional to sin 2\delta disappear, namely E_{\mu\tau}=0, in
symmetric matter. It means that the probability reduces to the same form as in
constant matter. As for other channels, probabilities in arbitrary matter are
at most the quadratic polynomials of sin \delta and cos \delta as in the above
two channels. In symmetric matter, the oscillation probability for each channel
reduces to the same form with respect to \delta as that in constant matter.


title: Does mirror matter exist?

abstract:
  One of the most fascinating ideas coming from particle physics is the concept
of mirror matter. Mirror matter is a new form of matter which is predicted to
exist if mirror symmetry is respected by nature. At the preset time evidence
that mirror matter actually exists is in abundance, coming from a range of
observations and experiments in astronomy, particle physics, meteoritics and
planetary science.


title: Overview on All Reactions Linked to GPDs

abstract:
  A short overview is given on how generalized parton distributions (GPDs)
enter in a variety of hard exclusive processes such as deeply virtual Compton
scattering (DVCS) and hard meson electroproduction reactions on the nucleon. We
firstly discuss the links between GPDs and elastic nucleon form factors which
represent powerful constraints on parametrizations of GPDs. Subsequently, we
show some key observables which are sensitive to the various hadron structure
aspects of the GPDs, and which are at present under experimental investigation
at different facilities (HERMES, H1/ZEUS, JLab and Compass), or will be
addressed by experiments in the near future.


title: B\to \pi\phi in SM and MSSM

abstract:
  We investigate the pure penguin decays $B\to \pi\phi$ in the Standard
Model(SM) and in the Constrained Minimal Supersymmetric Standard Model (CMSSM)
using the QCD factorization approach and consider the Sudakov effects in the
twist-3 contribution. We find ${\rm Br}(B^-\to \pi^-\phi) = (1.95-5.70)\times
10^{-9}$ in SM and $(1.1-2.4)\times 10^{-8}$ in CMSSM with large $\tan\beta $
which is about one order of magnitude larger than that in SM.


title: Single Top Production and Extra Dimensions

abstract:
  In extra dimension theories, where the gauge bosons of the standard model
propagate in the bulk of the extra dimensions, there are Kaluza-Klein
excitations of the standard model gauge bosons that can couple to the standard
model fermions. In this paper we study the effects of the excited Kaluza-Klein
modes of the $W$ on single top production at the Tevatron.


title:
Light-Cone HQET Sum Rules for the B --> pi Transition with 1/m_Q
  Corrections

abstract:
  The B --> pi ell nu weak decay form factors are calculated via light-cone sum
rules within the framework of the heavy quark effective theory. We calculate
the leading and the relevant sub-leading universal form factors. Our results
are matched to the known soft pion limit. We also address the large pion energy
limit of our sum rule results. Our results are compared with that of other
approaches.


title: Operator Analysis of Neutrinoless Double Beta Decay

abstract:
  We study the effective operators of the standard model fields which would
yield an observable rate of neutrinoless double beta decay. We particularly
focus on the possibility that neutrinoless double beta decay is dominantly
induced by lepton-number-violating higher dimensional operators other than the
Majorana neutrino mass. Our analysis can be applied to models in which
neutrinoless double beta decay is induced either by a strong dynamics or by
quantum gravity effects at a fundamental scale near the TeV scale as well as
the conventional models in which neutrinoless double beta decay is induced by
perturbative renormalizable interactions.


title: Real and Virtual Photon Structure

abstract:
  The structure of real and virtual photons has been studied in electron-proton
scattering processes producing di-jet events at HERA by the H1 and ZEUS
collaborations. Data have been compared to next-to-leading order QCD
calculations and to the predictions of Monte Carlo generators based on the
DGLAP and CCFM formalisms for describing the parton dynamics


title: The MC@NLO Event Generator

abstract:
  This is the user's manual of MC@NLO.1.0. This package is a practical
implementation, based upon the HERWIG event generator, of the recently proposed
MC@NLO formalism for matching the next-to-leading order calculation of a QCD
process with a parton-shower Monte Carlo simulation. The processes of
standard-model vector boson pair production in hadronic collisions are
available.


title: Gluon condensate in charmonium sum rules with 3-loop corrections

abstract:
  Charmonium sum rules are analyzed with the primary goal to obtain the
restrictions on the value of dimension 4 gluon condensate. The moments M_n(Q^2)
of the polarization operator of vector charm currents are calculated and
compared with experimental data. The 3-loop (alpha_s^2) perturbative
corrections, the gluon condensate contribution with alpha_s corrections and
dimension 6 operator G^3 contribution are accounted. It is shown that the sum
rules for the moments do not work at Q^2=0, where the perturbation series
diverges and G^3 contribution is large. The domain in the plane (n, Q^2), where
the sum rules are legitimate, is found. Strong correlation of the values of
gluon condensate and MS-bar charm quark mass quark is determined. The absolute
limits are found to be for gluon condensate <(alpha_s/pi)G^2>=0.009+-0.007
GeV^4 and for charm quark mass m(m)=1.275+-0.015 GeV in MS-bar scheme.


title: Novel constraints on $\Delta L=1$ interactions from neutrino masses

abstract:
  We reanalyze the constraints imposed on lepton-number violating interactions
by radiative contributions to neutrino masses at the one- and two-loop level in
supersymmetric models without R-parity. The interactions considered are the
$\Delta L=1$ superpotential operators $\lambda_{ijk} L_i L_j E^c_k$ and
$\lambda^\prime_{ijk} L_i Q_j D^c_k$, and the $\Delta L=1$ soft terms $A_{ijk}
\tilde{L}_i \tilde{L}_j \tilde{E}^c_k$ and $A_{ijk}^\prime \tilde{L}_i
\tilde{Q}_j \tilde{D}^c_k$. It is shown how the constraints on the couplings
$\lambda_{ijk}$ and $\lambda^\prime_{ijk}$ coming from the one-loop analysis
can be evaded. In such a case, the two-loop contributions to neutrino masses
become important. The combined one- and two-loop analysis yields constraints on
the couplings $\lambda_{i33}$ and $\lambda^\prime_{i33}$ that are rather
difficult to escape. The two-loop analysis yields also new constraints on
$A_{i33}$ and $A^\prime_{i33}$, which are not bounded at the one-loop level.
More freedom remains for couplings $\lambda_{ijk}$, $\lambda^\prime_{ijk}$, and
$A_{ijk}$, $A^\prime_{ijk}$, when $j$ and $k$ are first- or second-generation
indices.


title: Current quark mass and g-2 of muon and ee-->\pi\pi

abstract:
  Based on an effective chiral theory of mesons the dependences of
$\rho-\omega$ mixing and the vertex $\omega\pi\pi$ on $m_d-m_u$ are found. The
form factor of pion agrees with data in both space- and time-like regions. CVC
is satisfied. The values of g-2 of muon from $\pi\pi$ channel are calculated in
the range of $q^2<1.3^2 GeV^2$.


title: Tau-Sleptons and Tau-Sneutrino in the MSSM with Complex Parameters

abstract:
  We present a phenomenological study of tau-sleptons stau_1,2 and
tau-sneutrino in the Minimal Supersymmetric Standard Model with complex
parameters A_tau, mu and M_1. We analyse production and decays of stau_1,2 and
tau-sneutrino at a future e^+ e^- collider. We present numerical predictions
for the important decay rates, paying particular attention to their dependence
on the complex parameters. The branching ratios of the fermionic decays of
stau_1 and tau-sneutrino show a significant phase dependence for tan(beta) <
10. For tan(beta) > 10 the branching ratios for the stau_2 decays into Higgs
bosons depend very sensitively on the phases. We show how information on the
phase phi(A_tau) and the other fundamental stau parameters can be obtained from
measurements of the stau masses, polarized cross sections and bosonic and
fermionic decay branching ratios, for small and large tan(beta) values. We
estimate the expected errors for these parameters. Given favorable conditions,
the error of A_tau is about 10% to 20%, while the errors of the remaining stau
parameters are in the range of approximately 1% to 3%. We also show that the
induced electric dipole moment of the tau-lepton is well below the current
experimental limit.


title:
Fixed-Point Analysis of the Low-Energy Constants in the Pion-Nucleon
  Chiral Lagrangian

abstract:
  In the framework of heavy-baryon chiral perturbation theory, we investigate
the fixed point structure of renormalization group equations (RGE) for the
ratios of the renormalized low energy constants (LECs) that feature in the
pion-nucleon chiral Lagrangian. The ratios of the LECs deduced from our RGE
analysis are found to be in semi-quantitative agreement with those obtained
from direct fit to the experimental data. The naturalness of this agreement is
discussed using a simple dimensional analysis combined with Wilsonian RGEs.


title: Saturation effects in DIS at low x

abstract:
  We review basic ideas related to saturation of parton densities at small
value of the Bjorken variable x. A special emphasis is put on interpreting the
results from the ep deep inelastic scattering experiments at HERA.


title:
Vector-meson contributions do not explain the rate and spectrum in K_L
  -> pi0 gamma gamma

abstract:
  We analyze the recent NA48 data for the reaction K_L -> pi0 gamma gamma with
and without the assumption of vector meson dominance (VMD). We find that the
data is well described by a three-parameter expression inspired by O(p^6)
chiral perturbation theory. We also find that it is impossible to fit the shape
of the decay distribution and the overall rate simultaneously if one imposes
the VMD constraints on the three parameters. We comment on the different fits
and their implications for the CP-conserving component of the decay K_L -> pi0
e+ e-.


title: The Axial Anomaly in D=3+1 Light-Cone QED

abstract:
  We consider $(3+1)$-dimensional, Dirac electrons of arbitrary mass,
propagating in the presence of electric and magnetic fields which are both
parallel to the $x^3$ axis. The magnetic field is constant in space and time
whereas the electric field depends arbitrarily upon the light-cone time
parameter $x^+ = (x^0 + x^3)/\sqrt{2}$. We present an explicit solution to the
Heisenberg equations for the electron field operator in this background. The
electric field results in the creation of electron-positron pairs. We compute
the expectation values of the vector and axial vector currents in the presence
of a state which is free vacuum at $x^+ = 0$. Both current conservation and the
standard result for the axial vector anomaly are verified for the first time
ever in $(3+1)$-dimensional light-cone QED. An interesting feature of our
operator solution is the fact that it depends in an essential way upon
operators from the characteristic at $x^- = -L$, in addition to the usual
dependence upon operators at $x^+ = 0$. This dependence survives even in the
limit of infinite $L$. Ignoring the $x^-$ operators leads to a progressive loss
of unitarity, to the violation of current conservation, to the loss of
renormalizability, and to an incorrect result for the axial vector anomaly.


title: Condensates in Quantum Chromodynamics

abstract:
  The paper presents the short review of our to-day knowledge of vacuum
condensates in QCD. The condensates are defined as vacuum averages of the
operators which arise due to nonperturbative effects. The important role of
condensates in determination of physical properties of hadrons and of their
low-energy interactions in QCD is underlined. The special value of quark
condensate, connected with the existence of baryon masses is mentioned. Vacuum
condensates induced by external fields are discussed. QCD at low energy is
checked on the basis of the data on hadronic tau-decay. In the theoretical
analysis the terms of perturbation theory (PT) up to alpha^3_s are accounted,
in the operator product expansion (OPE) - those up to dimension 8. The total
probability of the decay tau->hadrons (with zero strangeness) and of the
tau-decay structure functions are best described at alpha_s(m^2_tau) =
0.330+-0.025. It is shown that the Borel sum rules for tau-decay structure
functions along the rays in the q^2-complex plane are in agreement with the
experiment with the accuracy ~2% at the values of the Borel parameter |M^2|>
0.8 GeV^2. The magnitudes of dimensions 6 and 8 condensates were found and the
limitations on gluonic condensates were obtained. The sum rules for the charmed
quark vector currents polarization operator was analysed in 3 loops (i.e., in
order alpha^2_s). The value of charmed quark mass (in MS-bar regularization
scheme) was found to be: m_c(m_c) = 1.275+-0.015 GeV and the value of gluonic
condensate was estimated: <(alpha_s/pi)G^2> = 0.009+-0.007 GeV^4. The general
conclusion is: QCD described by PT + OPE is in a good agreement with experiment
at Q^2 >~ 1 GeV^2.


title: Nonleptonic B decays into a charmed tensor meson

abstract:
  In the framework of the factorization and the heavy quark effective theory,
$B\to D_2^*\pi$ modes are analyzed. We adopt the result from the QCD sum rule
calculation for the hadronic matrix elements at leading order of $\Lambda_{\rm
QCD}/m_Q$ and $\alpha_s$. The QCD sum rule results are well compatible with the
current data, with the prediction on the branching ratios $\calB(\Bbar^0\to
D_2^{*+}\pi^-)=8.94\times 10^{-4}$ and $\calB(B^-\to D_2^{*0}\pi^-)=9.53\times
10^{-4}$ for $N_C^{\rm eff}=2$. We give constraints on the interception
$\tau(1)$ and the slope parameter $\rho^2$ of the leading Isgur-Wise function
from the experimental bounds. It is argued that the observation of nonzero
$\calB(\Bbar^0\to D_2^{*0}\pi^0)$ directly measures the nonfactorizable effets.


title: Weak radiative hyperon decays

abstract:
  The problem of weak radiative hyperon decays (WRHD) is reviewed. With the
recent measurement of the $\Xi ^0 \to \Lambda \gamma$ asymmetry confirming
Hara's theorem, implications from its violation in low-energy theoretical
approaches are discussed. It is shown how an underlying symmetry link should be
formulated for a successful description of both nonleptonic and radiative weak
hyperon decays. The sign of the $\Xi ^0 \to \Lambda \gamma$ asymmetry and the
overall size of parity-violating WRHD amplitudes together lead to the
resolution of the old S:P problem in nonleptonic decays.


title:
Equivalence of Classical Skyrmions and Coherent States of Baryons I.
  Constrained Quantization on the SU(2) and SO(3) manifolds

abstract:
  In the Skyrme model, the Lagrangian can be quantized in several ways using
the collective coordinate approach. Not all of which produce quantum states
that can be interpreted as physical particles. For example the SU(2) collective
coordinate approach produces both integral and half-integral spin and isospin
states. Only half of these are the physical baryons. Less well known is the
fact that it is equally possible to quantize the system using the SO(3)
collective coordinates. This produces only unphysical integral spin and isospin
states. To fulfill the goal of being able to express a classical skyrmion as a
coherent state of baryons directly in terms of the baryon states, surprisingly
a combination of both collective coordinate approaches is required. To prepare
for the subsequent application to skyrmion formation through disoriented chiral
condensates in heavy ion collisions, the Skyrme model is rigorously quantized
using the Dirac prescription for constrained systems. This is shown for both
the SU(2) as well as the SO(3) collective coordinate approach.


title:
Equivalence of Classical Skyrmions and Coherent States of Baryons II.
  Baryonic Coherent State Construction on Compact Manifolds

abstract:
  In connection with the possibility of skyrmion production from small domain
disoriented chiral condensates formation from heavy ion collisions, the direct
relation of a classical skyrmion to baryon states is examined. It is argued
that a skyrmion is a coherent state of baryons. The collective coordinate
approach of quantization means that the physical baryon states exist not in
flat space but on a compact manifold. This requires the construction of
coherent states in such a curve space. Using the techniques associated with the
Segal-Bargmann transform also known as the coherent state transform used for
example in the study of the classical limit of quantum gravity, such states can
be constructed in the context of the Skyrme model. They are made up directly of
baryon states on S^3 but with quantum operators on the SO(3) manifold. In terms
of wavefunctions, they are a superposition of the analytic baryon wavefunctions
of Adkins, Nappi and Witten. The distribution of the baryon states in terms of
the relative probabilities of the baryons inside a skyrmion can therefore be
determined.


title: t-channel unitarity and photon cross sections

abstract:
  We analyse the consequences of t-channel unitarity for the photon hadronic
cross sections. We show that gamma(*)p and gamma(*) gamma(*) elastic amplitudes
must include the complex-j plane singularities associated with hadronic elastic
amplitudes, and give the characteristics of possible new singularities. We also
show that several different models of hadronic total cross sections can be used
to predict the LEP data from the HERA measurements.


title: Weak Coupling Phases

abstract:
  Recent results obtained from B decays on the phases of weak couplings
described by the Cabibbo-Kobayashi-Maskawa (CKM) matrix are discussed, with
particular emphasis on $\alpha$ and $\gamma = \pi - \beta - \alpha$.


title: Light-front model of the kaon electromagnetic current

abstract:
  The electromagnetic form factor is extracted from both components of the
electromagnetic current: J(plus) and J(minus) with a pseudo-scalar coupling of
the quarks to the kaon.
  In the case of J(plus) there is no pair term contribution in the Drell-Yan
frame. However, J(minus) component of the electromagnetic current the pair term
contribution is different from zero and is necessary include it to preserve the
rotational symmetry of the current.


title: On the Behaviour and Stability of Superconducting Currents

abstract:
  We present analytic and numerical results for the evolution of currents on
superconducting strings in the classical $U(1) \times U(1)$ model. We derive an
energy functional for the currents and charges on these strings, establishing
rigorously that minima should exist in this model for loops of finite size
(vortons) if both charge and current are present on the worldsheet. We then
study the stability of the currents on these strings, and we find an analytic
criterion for the onset of instability (in the neutral limit). This limit
specifies a lower maximal current than previous heuristic estimates. We
conclude with a discussion of the evolution of loops towards their final vorton
state in the model under consideration.


title: Comment on Mott Scattering in strong Laser Field

abstract:
  The first differential cross section for Mott scattering of a Dirac-Volkov
electron is reviewed. The expression (26) derived by Szymanowski et al.
[Physical Review A {\bf 56}, 3846,(1997)] is corrected. In particular, we
disagree with the expression of $(\frac{d\sigma}{d\Omega})$ they obtained and
we give the exact coefficients multiplying the various Bessel functions
appearing in the scattering differential cross section.


title:
The Asymptotic Expansion of Lattice Loop Integrals Around the Continuum
  Limit

abstract:
  We present a method of computing any one-loop integral in lattice
perturbation theory by systematically expanding around its continuum limit. At
any order in the expansion in the lattice spacing, the result can be written as
a sum of continuum loop integrals in analytic regularization and a few genuine
lattice integrals (``master integrals''). These lattice master integrals are
independent of external momenta and masses and can be computed numerically. At
the one-loop level, there are four master integrals in a theory with only
bosonic fields, seven in HQET and sixteen in QED or QCD with Wilson fermions.


title:
Determining Strong and Weak Phases in B_d -> D^{(*)\pm} D^{(*)\mp}
  Decays

abstract:
  We show that both the weak phase \beta and the strong phase \delta_d can be
determined from the time-dependent measurement of B_d -> D^{*\pm} D^{\mp}
decays, whose final states are non-CP eigenstates. It is also possible to
extract \beta from B_d -> D^{*\pm} D^{*\mp} transitions without doing the
angular analysis. Possible final-state rescattering effects in B_d ->
D^{(*)\pm} D^{(*)\mp} channels are discussed by means of the isospin analysis.
We emphasize that it is worthwhile to check whether the naive factorization
approximation works or not for such B-meson decay modes into two heavy charmed
mesons.


title:
Using the Chern-Simons Action for a Self-Consistent Determination of the
  Magnetic Screening Mass in Thermal QCD

abstract:
  We present a self-consistent determination of the screening mass for
chromomagnetic fields in QCD within the framework of dimensional reduction. The
three-dimensional Chern-Simons density is used as a mass term for a
self-consistent perturbative calculation that yields a value of m ~ 1.604 g^2
N/2pi for the magnetic screening mass.


title: Aspects of QCD perturbative evolution

abstract:
  This thesis is devoted to the study of some aspects of perturbative QCD, and
in particular to the development of high-precision techniques for the
extraction of physical parameters such as structure functions, parton
distributions, and the strong coupling from the analysis of deep inelastic
scattering data. First, we will discuss scaling violations of singlet and
nonsinglet truncated moments, and the use of truncated momets to solve the
Altarelli-Parisi equation. Then we will suggest an approach based on neural
networks to the parametrization and interpolation of experimental data, which
retains information on experimental errors and correlations. The method of
truncated moments can be combined with the neural network fit to extract
various quantities of phenomenological interest in a bias-free way. As an
example of such application, we will discuss the determination of the strong
coupling constant.


title:
Unified description of a class of models for Bose-Einstein correlations
  in multiple particle production processes

abstract:
  Numerous models have been proposed to describe the Bose-Einstein correlations
in multiple particle production processes. In the present paper we describe a
generalization, which includes many previous models as special cases and,
therefore, can be useful for work of comparison. We apply the powerful methods
of eigenfunction expansions and generating functionals, which often make the
calculations much shorter than in the original papers.


title:
Coherent final state interaction in jet production in nucleus-nucleus
  collisions

abstract:
  We study the coherent final state interaction of an energetic parton produced
in AA collisions caused by the change in the cutoff scale and running coupling
constant from the vacuum to QGP. We demonstrate that the contribution of this
new mechanism to the energy loss may be of the order of magnitude of the
induced gluon radiation. However, an accurate evaluation of this medium effect
is a difficult task because there is a strong cancellation between the cutoff
and running coupling constant effects. The uncertainties in the contribution of
the coherent final state interaction restrict strongly the accuracy of jet
tomographic analyses of the matter density produced in AA reactions.


title:
Splitting of the pi - rho spectrum in a renormalized light-cone
  QCD-inspired model

abstract:
  We show that the splitting between the light pseudo-scalar and vector meson
states is due to the strong short-range attraction in the ^1S_0 sector which
makes the pion and the kaon light particles. We use a light-cone QCD-inspired
model of the mass squared operator with harmonic confinement and a Dirac-delta
interaction. We apply a renormalization method to define the model, in which
the pseudo-scalar ground state mass fixes the renormalized strength of the
Dirac-delta interaction.


title: Inflation and Generalized O'Raifeartaigh SUSY models

abstract:
  Thermal inflation usually requires an inflationary potential with
nonrenormalizable operators (NROs). We demonstrate how O'Raifeartaigh models
with or without NROs can provide thermal inflation and a solution to the moduli
problem, as well as provide SUSY breaking. We then discuss a scenario where
generalized O'Raifeartaigh potentials (with NROs) are included in a SUGRA where
the supergravity and O'Raifeartaigh potentials provide negative and a positive
contributions to the cosmological constant respectively. Tuning these
contributions to nearly cancel can provide the present value of the dark
energy.


title: Hadron physics at a neutrino factory

abstract:
  We review the way intense neutrino beams at the front-end of a muon storage
ring can be used to probe the structure of hadrons. Specifically, we discuss
how the polarized and unpolarized flavor structure of the nucleon can be
disentangled in inclusive deep-inelastic scattering, and how less inclusive
measurements can shed light on various aspects of hadron structure such as
fragmentation functions or generalized parton distributions.


title: Saturation of Nuclear Partons: the Fermi Statistics or Nuclear Opacity?

abstract:
  We derive the two-plateau momentum distribution of final state (FS) quarks
produced in deep inelastic scattering (DIS) off nuclei in the saturation
regime. The diffractive plateau which dominates for small transverse momentum p
measures precisely the momentum distribution of quarks in the beam photon, the
role of the nucleus is simply to provide an opacity. The plateau for truly
inelastic DIS exhibits a substantial nuclear broadening of the FS momentum
distribution. We discuss the relationship between the FS quark densities and
the properly defined initial state (IS) nuclear quark densities.The
Weizs\"acker-Williams glue of a nucleus exhibits a substantial nuclear
dilution, still soft IS nuclear sea saturates because of the anti-collinear
splitting of gluons into sea quarks.


title: Quintessential Baryogenesis

abstract:
  The simplest explanation for early time acceleration (inflation) and the late
time acceleration indicated by recent data is that they have a common origin.
We investigate another generic cosmological implication of this possiblity,
that the baryon asymmetry of the universe may be generated in such models. We
identify several novel features of baryogenesis in such a universe, in which a
rolling scalar field is always part of the cosmological energy budget. We also
propose a concrete mechanism by which the baryon asymmetry of the universe may
be generated in this context. We analyze the generic properties of and
constraints on these cosmologies, and then demonstrate explicitly how a
complete cosmology may develop in some specific classes of models.


title: D0-anti-D0 mixing

abstract:
  The Standard Model contribution to D0-anti-D0 mixing is dominated by the
contributions of light s and d quarks. Neglecting the tiny effects due to b
quark, both mass and lifetime differences vanish in the limit of SU(3)
symmetry. Thus, the main challenge in the Standard Model calculation of the
mass and width difference in the D0-anti-D0 system is to estimate the size of
SU(3) breaking effects. We prove that D meson mixing occurs in the Standard
Model only at second order in SU(3) violation. We consider the possibility that
phase space effects may be the dominant source of SU(3) breaking. We find that
y=Delta Gamma/2Gamma of the order of one percent is natural in the Standard
Model, potentially reducing the sensitivity to new physics of measurements of D
meson mixing. We also discuss the possibility of observing lifetime differences
and CP violation in charmed mesons both at the currently operating and proposed
facilities.


title: CP Violation in SUSY, Strings and Branes

abstract:
  A review is given of CP violation in a broad class of models based on
supersymmetry, superstrings and brane models. Such models contain typically
large CP violating phases which affect a variety of supersymmetric phenomenon
at low energies and affect search for supersymmetry at colliders and in dark
matter experiments. We focus here on few such phenomena, specifically the
mixing of the CP even and the CP odd Higgs bosons which can be induced by loop
corrections and on CP violation in the muon sector. Possible signals for the
observation of CP violation are also discussed.


title:
Matching between matrix elements and parton showers using a Leading-Log
  subtraction method in NLO-QCD

abstract:
  A new method to construct event-generators based on next-to-leading order QCD
matrix-elements and leading-logarithmic parton showers is proposed. Matrix
elements of loop diagrams as well as those of a tree level can be generated
using an automatic system. A soft/collinear singularity is treated using a
leading-log subtraction method. Higher order re-summation of the soft/collinear
correction by the parton shower method is combined with the NLO matrix-element
without any double-counting in this method.


title: Modified perturbation theory approach for tt-bar production and decay

abstract:
  The modified perturbation theory (MPT), based on direct expansion of
probabilities instead of amplitudes, allows one to avoid divergences in the
phase-space integrals resulting from production and decay of unstable
particles. In the present paper the range of applicability of MPT is determined
numerically in the case of the process $e^+e^- \to (\gamma,Z) \to t\bar t \to
W^{+}b:W^{-}\bar b$. It is shown that with the complete expansion in powers of
the coupling constant (without Dyson resummation) MPT operates best at the
energies located near the maximum of the cross-section and slightly above the
maximum. In this region the MPT expansion within the next-to-leading order
considerably exceeds in accuracy well-known DPA approach.


title: Pion-pion scattering above resonances

abstract:
  We model large angle intermediate energy pion-pion scattering by the pQCD
two-gluon (2g) exchange contribution and discuss the onset of the dominance of
the Glauber-Gribov-Landshoff (GGL) component. The pQCD 2g exchange contribution
becomes substantial already at $|t|\sim$ 1 GeV^{2}, but the pQCD exchange
dominance is deferred to $|t|\sim$ 3 GeV^{2} because of competing multiple soft
rescattering effects. Based on the NN and $\pi N$ total cross section data and
Regge factorization, we evaluate the dominant soft contribution to the $\pi
\pi$ total cross section and find the results consistent with the ones deduced
earlier from the absorption model analysis of the $\pi N \to X N, X \Delta$
data.


title:
Forward-backward multiplicity correlations and leakage parameter
  behaviour in asymmetric high energy collisions

abstract:
  Continuing previous work, forward-backward multiplicity correlations are
studied in asymmetric collisions in the framework of the weighted superposition
mechanism of different classes of events. New parameters for the asymmetric
clan distribution and for the particle leakage from clans in one hemisphere to
the opposite one are introduced to effectively classify different classes of
collisions. This tool should be used to explore forward-backward multiplicity
correlations in AB and pA collisions in present and future experiments at RHIC
and LHC.


title: Generalized parton distributions and constituent quarks

abstract:
  An approach is described to calculate Generalized Parton Distributions (GPDs)
in Constituent Quark Models (CQM). The GPDs are obtained from wave functions to
be evaluated in a given CQM. The general relations linking the twist-two GPDs
to the form factors and to the leading twist quark densities are recovered.
Results for the leading twist, unpolarized GPD in the Isgur and Karl model are
presented.


title: Z$ decay into a bottom quark, a light sbottom and a light gluino

abstract:
  The discrepancy between the measured and theoretical production cross section
of $b$ quarks at the Tevatron can probably be explained by the recently
proposed scenario of light gluinos of mass 12-16 GeV and light sbottoms of mass
$2-5.5$ GeV. In this scenario, we study a related process at the $Z$ pole, $Z
\to b \tilde{b}_1^* \tilde{g} + \bar b \tilde{b}_1 \tilde{g}$ followed by
$\tilde{g} \to b \tilde{b}_1^* / \bar b \tilde{b}_1$. The hadronic branching
ratio for this channel is $(1-3) \times 10^{-3}$, which is of order of the size
of the uncertainty in $R_b$. We find that a typical event consists of an
energetic prompt bottom-jet back-to-back with a ``fat'' bottom-jet, which
consists of a bottom quark and two bottom squarks. Such events with a $10^{-3}$
branching ratio may affect the measurement of $R_b$; even more interesting if
the ``fat'' bottom jet can be identified.


title: Translating Quark Dynamics into Hadron Physics (and back again)

abstract:
  Why should we study mesons in 2002? Two approaches to relating quark and
gluon dynamics to hadron physics, namely QCD sum rules and effective field
theories, are briefly discussed. These are linked by progress in the study of
strong QCD, both by lattice Monte Carlo methods and in the continuum. These
provide the translation from quark dynamics to hadron physics and back again.
Scope for more theoretical work and further experiments to elucidate the nature
of the QCD vacuum and its precise relation to scalar mesons and their
interactions is outlined.


title: Graviton-induced Bremsstrahlung

abstract:
  We discuss photon Bremsstrahlung induced by virtual graviton exchange in
proton-proton interactions at hadronic colliders, resulting from the exchange
of Kaluza-Klein excitations of the graviton. The relevant subprocesses, gg to G
to e^+e^-gamma and q barq to e^+e^-gamma are discussed in both the ADD and the
RS scenarios. Although two-body final states (or real graviton emission) would
presumably be the main discovery channels, a search for three-body final states
could be worthwhile since such events have characteristic features that could
provide additional confirmation. In particular, the k_perp-distribution of the
photon is in both scenarios harder than that of the Standard-model background.