title:
Lepton flavor violation with supersymmetric Higgs triplets in TeV region
  for neutrino masses and leptogenesis

abstract:
  Lepton flavor violating processes such as \mu \to 3e and \mu \to e \gamma are
investigated with supersymmetric Higgs triplet pair \Delta and \bar \Delta in
the light of neutrino masses and experimentally verifiable leptogenesis. The
Higgs triplet mass M_\Delta is expected to be in the range of 1 - 100 TeV. The
branching ratios of these charged lepton decays are evaluated in terms of
M_\Delta and the coupling f L \Delta L of Higgs triplet \Delta with lepton
doublet pairs L L, which is proportional to the neutrino mass matrix. They may
be reached in the future collider experiments. In particular, the \mu \to 3e
decay would be observed indicating the existence of Higgs triplets with
M_\Delta \sim 1 - 100 TeV for | f | \sim 0.1 - 1, while the \mu \to e \gamma
decay can be significant irrespective of M_\Delta in the supersymmetric model
due to the flavor violation in the slepton mass matrices induced by the
renormalization effects.


title: Techniques for NNLO Higgs production in the Standard Model and the MSSM

abstract:
  New techniques developed in connection with the NNLO corrections to the Higgs
production rate at hadron colliders and some recent applications are reviewed.


title: Simple Atoms, Quantum Electrodynamics and Fundamental Constants

abstract:
  This review is devoted to precision physics of simple atoms. The atoms can
essentially be described in the framework of quantum electrodynamics (QED),
however, the energy levels are also affected by the effects of the strong
interaction due to the nuclear structure. We pay special attention to QED tests
based on studies of simple atoms and consider the influence of nuclear
structure on energy levels. Each calculation requires some values of relevant
fundamental constants. We discuss the accurate determination of the constants
such as the Rydberg constant, the fine structure constant and masses of
electron, proton and muon etc.


title: Electric charge and magnetic moment of massive neutrino

abstract:
  We consider a massive Dirac neutrino electric charge and magnetic moment
within the context of the standard model supplied with SU(2)-singlet
right-handed neutrino in arbitrary R_\xi gauge. Using the
dimensional-regularization scheme we start with calculations of the one-loop
contributions to the neutrino electromagnetic vertex function exactly
accounting for the neutrino and other particles masses. We examine the
decomposition of the massive neutrino electromagnetic vertex function and show
that it contains only the four form factors. Then we get the closed integral
expressions for different contributions to the neutrino electric charge and
magnetic form factors. These calculations enable us to follow the neutrino and
corresponding charged lepton masses and gauge-fixing parameters dependence. For
several one-loop contributions to the neutrino charge and magnetic moment, that
were calculated previously by the other authors with mistakes, we find the
correct results. We show that the neutrino charge for massive neutrino is a
gauge independent and vanishing value in the first two orders of the expansion
over the neutrino mass parameter b. In the particular choice of the 't
Hooft-Feynman gauge we also demonstrate that the neutrino charge is zero for
arbitrary mass of neutrino. For each of the diagrams contributing to the
neutrino magnetic moment, we get expressions accounting for the leading and
next-to-leading order in b with the gauge dependence shown explicitly. Each of
the contributions are finite and the sum of all contributions turns out to be
gauge-independent. Our calculations also enable us to get the magnetic moment
of a heavy neutrino.


title:
NLO corrections to the twist-3 amplitude in DVCS on a nucleon in the
  Wandzura-Wilczek approximation: quark case

abstract:
  We computed the NLO corrections to twist-3, $L \to T$, flavor non-singlet
amplitude in DVCS on a nucleon in the Wandzura-Wilczek approximation. Explicit
calculation shows that factorization holds for NLO contribution to this
amplitude, although the structure of the factorized amplitude at the NLO is
more complicated than in the leading-order formula. Next-to-leading order
coefficient functions for matrix elements of twist-3 vector and axial-vector
quark string operators and their LO evolution equations are presented.


title: High energy extension of the FLUKA atmospheric neutrino flux

abstract:
  The atmospheric neutrino flux calculated with FLUKA was originally limited to
100-200 GeV for statistical reasons. In order to make it available for the
analysis of high energy events, like upward through-going muons detected by
neutrino telescopes, we have extended the calculation so to provide a reliable
neutrino yield per primary nucleon up to about 10**6 GeV/nucleon, as far as the
interaction model is concerned. We point out that the primary flux model above
100 GeV/nucleon still contributes with an important systematic error to the
neutrino flux.


title: The DsJ(2317): what can the Lattice say?

abstract:
  We present lattice results on the scalar $D_s$ meson and comment on the
$D_{sJ}^+(2317)$ state recently discovered by BaBar and confirmed by CLEO, in
view of a series of theoretical claims and counter claims. Lattice predictions
in the static limit indicate larger masses than observed for a scalar quark
model state. Finite $c$ quark mass corrections seem to further enlarge this
discrepancy, in support of a non quark-antiquark-state interpretation of
experiment.


title: Separation of Soft and Hard Physics in Deeply Virtual Compton Scattering

abstract:
  A model for deeply virtual Compton scattering, based on analytical light-cone
hadron wave functions is presented and studied at energies currently accessible
at Jefferson Laboratory, DESY, and beyond. It is shown that perpendicular
vector components play an important role at Q^2 < 10 GeV^2 and that the
meson-exchange diagrams are important at all energies. This could significantly
impact the physical interpretation of the underlying hadron amplitudes.


title: Standard-model coupling constants from compositeness

abstract:
  A coupling-constant definition is given based on the compositeness property
of some particle states with respect to the elementary states of other
particles. It is applied in the context of the vector-spin-1/2-particle
interaction vertices of a field theory, and the standard model. The definition
reproduces Weinberg's angle in a grand-unified theory. One obtains coupling
values close to the experimental ones for appropriate configurations of the
standard-model vector particles, at the unification scale within grand-unified
models, and at the electroweak breaking scale.


title: Phenomenological Constraints on Patterns of Supersymmetry Breaking

abstract:
  Specific models of supersymmetry breaking predict relations between the
trilinear and bilinear soft supersymmetry breaking parameters A_0 and B_0 at
the input scale. In such models, the value of tan beta can be calculated as a
function of the scalar masses m_0 and the gaugino masses m_{1/2}, which we
assume to be universal. The experimental constraints on sparticle and Higgs
masses, b to s gamma decay and the cold dark matter density Omega_{CDM} h^2 can
then be used to constrain tan beta in such specific models of supersymmetry
breaking. In the simplest Polonyi model with A_0 = (3 - sqrt{3})m_0 = B_0 +
m_0, we find 11 < tan beta < 20 (tan beta ~ 4.15) for mu > 0 (mu < 0). We also
discuss other models with A_0 = B_0 + m_0, finding that only the range -1.9 <
A_0/m_0 < 2.5 is allowed for mu > 0, and the range 1.25 < A_0/m_0 < 4.8 for mu
< 0. In these models, we find no solutions in the rapid-annihilation `funnels'
or in the `focus-point' region. We also discuss the allowed range of tan beta
in the no-scale model with A_0 = B_0 = 0. In all these models, most of the
allowed regions are in the chi - stau_1 coannihilation `tail'.


title: BABAR resonance as a new window of hadron physics

abstract:
  Possible decays of four-quark mesons are studied by assigning the newly
observed BABAR resonance to a four-quark meson with C=S=I=1. It is expected
that some of them can be observed as narrow resonances. Implication of
existence of four-quark mesons in hadronic weak interactions is also discussed.


title: Spectrum of TeV Particles in Warped Supersymmetric Grand Unification

abstract:
  In warped supersymmetric grand unification, XY gauge particles appear near
the TeV scale along with Kaluza-Klein towers of the standard model gauge
fields. In spite of this exotic low-energy physics, MSSM gauge coupling
unification is preserved and proton decay is naturally suppressed. In this
paper we study in detail the low-lying mass spectrum of superparticles and GUT
particles in this theory, taking supersymmetry breaking to be localized to the
TeV brane. The masses of the MSSM particles, Kaluza-Klein modes, and XY states
are all determined by two parameters, one which fixes the strength of the
supersymmetry breaking and the other which sets the scale of the infrared
brane. A particularly interesting result is that for relatively strong
supersymmetry breaking, the XY gauginos and the lowest Kaluza-Klein excitations
of the MSSM gauginos may both lie within reach of the LHC, providing the
possibility that the underlying unified gauge symmetry and the enhanced N=2
supersymmetry of the theory will both be revealed.


title: Theoretical and Phenomenological Aspects of CPT Violation

abstract:
  I review briefly various models and ways of Quantum-Gravity induced CPT
violation, and discuss in some detail their phenomenology, in particular
precision CPT tests in neutral mesons, and hydrogen/antihydrogen spectroscopy.
As I shall argue, severe constraints can be placed in CPT violating parameters,
with sensitivities that can safely exclude models with effects suppressed by a
single power of Planck mass.


title:
Radiative decays of mesons in the quark model: relativistic and
  non-relativistic approaches

abstract:
  Different conclusions about quark nature of f0(980) based on the analysis of
data on the reaction phi(1020) -> gamma f0(980) make it necessary to perform
detailed comparison of formulae used by various groups for the calculation of
partial widths of radiative decays. We carry out a comparative analysis of
methods of calculation of radiative decays like phi -> gamma f0 and phi ->
gamma eta performed by F.E.Close et al., Phys. Rev. D 65, 092003 (2002), and
A.V.Anisovich et al., Eur. Phys. J. A 12, 103 (2001); Yad. Fiz. 65, 523 (2002).


title:
An attempt to construct pion distribution amplitude from the PCAC
  relation in the nonlocal chiral quark model

abstract:
  Using the PCAC relation, we derive a compact formula for the pion decay
constant $F_{\pi}$ in the nonlocal chiral quark model. For practical
calculations this formula may be used both in the Minkowski and in the
Euclidean space. For the pion momentum $P_{\mu}\to0$ it reduces to the well
known expression derived earlier by other authors. Using a generalized dipole
Ansatz for the momentum dependence of the constituent quark mass in the
Minkowski space, we express $F_{\pi}^{2}$ in terms of a single integral over
the quark momentum fraction $u$. We interpret the integrand as a pion
distribution amplitude $\phi(u)$. We discuss its properties and compare with
the $\pi$DA's obtained in other models.


title:
Supersymmetry breaking with quasi-localized fields in orbifold field
  theories

abstract:
  We study the Scherk-Schwarz supersymmetry breaking in five-dimensional
orbifold theories with five-dimensional fields which are not strictly localized
on the boundaries (quasi-localized fields). We show that the Scherk-Schwarz
(SS) mechanism, besides the SS parameter \omega, depends upon new parameters,
e.g. supersymmetric five-dimensional odd mass terms, governing the level of
localization on the boundaries of the five-dimensional fields and study in
detail such a dependence. Taking into account radiative corrections, the value
of \omega is dynamically allowed to acquire any value in the range 0< \omega <
1/2.


title:
Unintegrated parton distributions of pions and nucleons from the CCFM
  equations in the single-loop approximation

abstract:
  The unintegrated quark and gluon distributions in the pion and nucleon are
analysed using the CCFM equations in the single-loop approximation. We utilise
the transverse-coordinate (or impact-parameter) representation which
diagonalises the equations and study in detail the dependence on the transverse
coordinate induced by the CCFM evolution. We find considerable broadening of
the transverse-momentum distributions with an increasing magnitude of the hard
scale, Q. For instance, at the Bjorken x=0.1 the root mean squared transverse
momentum of the gluons is enhanced by about 1 GeV when evolved from the the
initial low scale to Q^2=10 GeV^2, and by about 2 GeV when evolved up to
Q^2=100 GeV^2. The broadening effect is enhanced with decreasing Bjorken x, and
is stronger for the gluons than for the quarks. Analytic solution for the
average transverse momentum corresponding to the x-moments of the distributions
is obtained. The parton luminosities are also discussed.


title:
Quantum dynamics of Phi**4 field theory beyond leading order in 1+1
  dimensions

abstract:
  We consider the out-of-equilibrium evolution of a classical condensate field
$\phi=<\Phi>$ and its quantum fluctuations for a $\Phi^4$ model in 1+1
dimensions with a double well potential. We use the two-particle
point-irreducible (2PPI) formalism in the two-loop approximation. We compare
our results to those obtained in the Hartree approximation, in the bare vertex
approximation (BVA) and in the two-particle irreducible next-to-leading order
large-N (2PI-1/N) approach, with thermal initial conditions. In the 2PPI scheme
we find that the system tends to the symmetric configuration at late times, as
expected in the absence of spontaneous symmetry breaking.


title:
Probing Grand Unification Through Neutrino Oscillations, Leptogenesis,
  and Proton Decay

abstract:
  Evidence in favor of supersymmetric grand unification including that based on
the observed family multiplet-structure, gauge coupling unification, neutrino
oscillations, baryogenesis, and certain intriguing features of quark-lepton
masses and mixings is noted. It is argued that attempts to understand (a) the
tiny neutrino masses (especially Delta m^2 (nu_2 -nu_3)), (b) the baryon
asymmetry of the universe (which seems to need leptogenesis), and (c) the
observed features of fermion masses such as the ratio m_b/m_tau, the smallness
of V_cb and the maximality of theta_{nu_mu-nu_tau}, seem to select out the
route to higher unification based on an effective string-unified G(224) =
SU(2)_L x SU(2)_R x SU(4)^c or SO(10)-symmetry, operative in 4D, as opposed to
other alternatives.
  A predictive framework based on an effective SO(10) or G(224) symmetry
possessing supersymmetry is presented that successfully describes the masses
and mixings of all fermions including neutrinos. It also accounts for the
observed baryon asymmetry of the universe by utilizing the process of
leptogenesis, which is natural to this framework. It is argued that a
conservative upper limit on the proton lifetime within this
SO(10)/G(224)-framework, which is so far most successful, is given by (1/3-2) x
10^34 years. This in turn strongly suggests that an improvement in the current
sensitivity by a factor of five to ten (compared to SuperK) ought to reveal
proton decay. Implications of this prediction for the next-generation nucleon
decay and neutrino-detector are noted.


title:
Positivity constraints on initial spin observables in inclusive
  reactions

abstract:
  For any inclusive reaction of the type $A_1({spin} 1/2)+ A_2({spin} 1/2) \to
B + X$, we derive new positivity constraints on spin observables and study
their implications for theoretical models in view, in particular, of accounting
for future data from the polarized $pp$ collider at BNL-RHIC. We find that the
single transverse spin asymmetry $A_N$ for several processes, in the central
region for example jet production, direct photon production, lepton-pair
production, must be such that $|A_N| \lappeq 1/2$, rather than the usual bound
$|A_N| \leq 1$.


title: Will we observe black holes at LHC?

abstract:
  The generalized uncertainty principle, motivated by string theory and
non-commutative quantum mechanics, suggests significant modifications to the
Hawking temperature and evaporation process of black holes. For
extra-dimensional gravity with Planck scale O(TeV), this leads to important
changes in the formation and detection of black holes at the the Large Hadron
Collider. The number of particles produced in Hawking evaporation decreases
substantially. The evaporation ends when the black hole mass is Planck scale,
leaving a remnant and a consequent missing energy of order TeV. Furthermore,
the minimum energy for black hole formation in collisions is increased, and
could even be increased to such an extent that no black holes are formed at LHC
energies.


title: Are direct photons a clean signal of a thermalized quark gluon plasma?

abstract:
  Direct photon production from a quark gluon plasma (QGP) in thermal
equilibrium is studied directly in real time. In contrast to the usual S-matrix
calculations, the real time approach is valid for a QGP that formed and reached
LTE a short time after a collision and of finite lifetime ($\sim 10-20
\mathrm{fm}/c$ as expected at RHIC or LHC). We point out that during such
finite QGP lifetime the spectrum of emitted photons carries information on the
initial state. There is an inherent ambiguity in separating the virtual from
the observable photons during the transient evolution of the QGP. We propose a
real time formulation to extract the photon yield which includes the initial
stage of formation of the QGP parametrized by an effective time scale of
formation $\Gamma^{-1}$. This formulation coincides with the S-matrix approach
in the infinite lifetime limit. It allows to separate the virtual cloud as well
as the observable photons emitted during the pre- equilibrium stage from the
yield during the QGP lifetime. We find that the lowest order contribution
$\mathcal{O}(\alpha_{em})$ which does \emph{not} contribute to the S-matrix
approach, is of the same order of or larger than the S-matrix contribution
during the lifetime of the QGP for a typical formation time $\sim 1
\mathrm{fm}/c$. The yield for momenta $\gtrsim 3 \mathrm{Gev}/c$ features a
power law fall-off $\sim T^3 \Gamma^2/k^{5}$ and is larger than that obtained
with the S-matrix for momenta $\geq 4 \mathrm{Gev}/c$. We provide a
comprehensive numerical comparison between the real time and S-matrix yields
and study the dynamics of the build-up of the photon cloud and the different
contributions to the radiative energy loss. The reliability of the current
estimates on photon emission is discussed.


title: Phenomenology of Lorentz-Conserving Noncommutative QED

abstract:
  Recently a version of Lorentz-conserving noncommutative field theory (NCFT)
has been suggested. The underlying Lie algebra of the theory is the same as
that of Doplicher, Fredenhagen, and Roberts. In Lorentz-conserving NCFT the
matrix parameter {theta}^{mu nu} which characterizes the canonical NCFT's is
promoted to an operator {theta hat}^{mu nu} that transforms as a Lorentz
tensor. In this paper, we calculate phenomenological consequences of the QED
version of this theory by looking at various collider processes. In particular
we calculate modifications to Moller scattering, Bhabha scattering, e^+e^- -->
mu^+ mu^- and e^+e^- --> gamma gamma. We obtain bounds on the noncommutativity
scale from the existing experiments at LEP and make predictions for what may be
seen in future collider experiments.


title: Dileptons from hot heavy static photons

abstract:
  We compute the production rate of lepton pair by static photons at finite
temperature at two-loop order. We treat the infrared region of the gluon phase
space carefully by using a hard thermal loop gluon propagator. The result is
free of infrared and collinear divergences and exhibits an enhancement which
produces a result of order $\sim e^2 g^3$ instead of $\sim e^2 g^4$ as would be
expected from ordinary perturbation theory.


title: New physics effects in rare Z decays

abstract:
  Virtual effects induced by new physics in rare Z decays are reviewed. Since
the expected sensitivity of the giga-Z linear collider is of the order of
$10^{-8}$, we emphasize the importance of any new physics effect that gives a
prediction above this limit. It is also pointed out that an improvement on the
known experimental constraints on rare Z decays will provide us with a critical
test of the validity of the standard model at the loop level.


title:
HQEFT as A Large Component QCD and Comments on The Incompleteness of
  HQET

abstract:
  The Heavy quark effective field theory (HQEFT) is revisited in a more
intuitive way. It is shown that HQEFT is a consistent large component QCD of
heavy quarks. In the non-relativistic limit, HQEFT recovers the
non-relativistic QCD (NRQCD). The resulting new effects in the HQEFT of QCD are
carefully reexamined. It is then natural to come to the comments on the usual
heavy quark effective theory (HQET). Consistent phenomenological applications
of HQEFT exhibit its interesting features and completeness in comparison with
HQET. It then becomes manifest why we shall base on the HQEFT of QCD rather
than HQET which is an incomplete one for computing 1/m_Q corrections. More
precise extraction for |V_{cb}| and |V_{ub}| in the HQEFT of QCD is emphasized.


title: Inverting the seesaw formula

abstract:
  By inverting the seesaw formula we determine the heavy neutrino mass matrix.
The impact on the baryogenesis via leptogenesis and the radiative lepton decays
in supersymmetric models is described. Links to neutrinoless double beta decay
are also briefly discussed. The analysis leads to two distinct matrix models.
One has small mixings while the other has one maximal mixing. Both cannot give
a sufficient amount of baryon asymmetry. Then we also comment on a different
form of the Dirac neutrino mass matrix, which does provide sufficient baryon
asymmetry. In a supersymmetric scenario the branching ratios of radiative
lepton decays are enhanced for this model.


title: Supersymmetric Models For Gauge Inflation

abstract:
  We present possible realizations of gauge inflation arising from a 5D ${\cal
N}=1$ supersymmetric U(1) model, where the extra dimension is compactified on a
circle. A one-loop inflaton effective 4D potential is generated, with the
inflaton being a 'Wilson-line field'. It relies on a SUSY breaking. We first
consider SUSY breaking to occur spontaneously within a 'no-scale' model by a
non zero $F$-term of the radion superfield which transmits SUSY breaking into
the 'visible' sector. As an alternative, we study $D$-term SUSY breaking
originating directly from the 5D gauge supermultiplet. Together with the usual
KK resummation method, we present a calculation with the world-line formalism.
The latter allows one to get the resulting effective potential directly as a
sum over all winding modes. For both presented scenarios, the generated
effective potentials have suitable forms for realizing successful inflation,
i.e. are flat enough and give the needed number of ${\rm e}$-foldings. In
addition, there is a natural way to get strongly suppressed values for the
potentials, which then could be associated with dark energy/quintessence.


title: Pion production in deeply virtual Compton scattering

abstract:
  Using a soft pion theorem based on chiral symmetry and a $\Delta(1232)$
resonance model we propose an estimate for the production cross section of low
energy pions in the deeply virtual Compton scattering (DVCS) process. In
particular, we express the $e p \to e \gamma \pi N$ processes in terms of
generalized parton distributions. We provide estimates of the contamination of
the $e p \to e \gamma p$ DVCS observables due to this associated pion
production processes when the experimental data are not fully exclusive, for a
set of kinematical conditions representative of present or planned experiments
at JLab, HERMES and COMPASS.


title: Theory and phenomenology of non-global logarithms

abstract:
  We discuss the theoretical treatment of non-global observables, those
quantities that are sensitive only to radiation in a restricted region of phase
space, and describe how large `non-global' logarithms arise when we veto the
energy flowing into the restricted region. The phenomenological impact of
non-global logarithms is then discussed, drawing on examples from event shapes
in DIS and energy-flow observables in 2-jet systems. We then describe
techniques to reduce the numerical importance of non-global logarithms, looking
at clustering algorithms in energy flow observables and the study of associated
distribution of multiple observables.


title: U(e3) from physics above the GUT scale

abstract:
  We consider non-renormalizable 1/M_X interaction terms as a perturbation of
the conventional neutrino mass matrix. Particular attention is given to the
gravitational interaction with M_X=M_Pl. We find that for the degenerate
neutrino mass spectrum, the considered perturbation generates a non-zero U(e3)
which is within reach of the high performance neutrino factories and just on
the borderline to be of interest for supernova physics. For the hierarchical
mass spectrum this effect is small. For 1/M_X interaction terms with M_X about
the GUT scale, a detectable U(e3) term is induced for the hierarchical mass
spectra also. Numerical estimates are given for all the above mentioned cases
and renormalization effects are considered.


title: Numerical evaluation of multi-loop integrals by sector decomposition

abstract:
  In a recent paper we have presented an automated subtraction method for
divergent multi-loop/leg integrals in dimensional regularisation which allows
for their numerical evaluation, and applied it to diagrams with massless
internal lines. Here we show how to extend this algorithm to Feynman diagrams
with massive propagators and arbitrary propagator powers. As applications, we
present numerical results for the master 2-loop 4-point topologies with massive
internal lines occurring in Bhabha scattering at two loops, and for the master
integrals of planar and non-planar massless double box graphs with two
off-shell legs. We also evaluate numerically some two-point functions up to 5
loops relevant for beta-function calculations, and a 3-loop 4-point function,
the massless on-shell planar triple box. Whereas the 4-point functions are
evaluated in non-physical kinematic regions, the results for the propagator
functions are valid for arbitrary kinematics.


title:
The Ginzburg-Landau Theory and the Surface Energy of a Colour
  Superconductor

abstract:
  We apply the Ginzburg-Landau theory to the colour superconducting phase of a
lump of dense quark matter. We calculate the surface energy of a domain wall
separating the normal phase from the super phase with the bulk equilibrium
maintained by a critical external magnetic field. Because of the symmetry of
the problem, we are able to simplify the Ginzburg-Landau equations and express
them in terms of two components of the di-quark condensate and one component of
the gauge potential. The equations also contain two dimensionless parameters:
the Ginzburg-Landau parameter ${\kappa}$ and ${\rho}$. The main result of this
paper is a set of inequalities obeyed by the critical value of the
Ginzburg-Landau parameter--the value of ${\kappa}$ for which the surface energy
changes sign--and its derivative with respect to ${\rho}$. In addition we prove
a number of inequalities of the functional dependence of the surface energy on
the parameters of the problem and obtain a numerical solution of the
Ginzburg-Landau equations. Finally a criterion for the types of colour
superconductivity (type I or type II) is established in the weak coupling
approximation.


title: Solving the BFKL Equation in the Next-to-Leading Approximation

abstract:
  The Balitsky-Fadin-Kuraev-Lipatov equation in the next-to-leading logarithmic
approximation is solved using an iterative method. We derive the solution for
forward scattering with all conformal spins. A discussion of the infrared
finiteness of the results is included.


title: Gauge Theories on an Interval: Unitarity without a Higgs

abstract:
  We consider extra dimensional gauge theories on an interval. We first review
the derivation of the consistent boundary conditions (BC's) from the action
principle. These BC's include choices that give rise to breaking of the gauge
symmetries. The boundary conditions could be chosen to coincide with those
commonly applied in orbifold theories, but there are many more possibilities.
To investigate the nature of gauge symmetry breaking via BC's we calculate the
elastic scattering amplitudes for longitudinal gauge bosons. We find that using
a consistent set of BC's the terms in these amplitudes that explicitly grow
with energy always cancel without having to introduce any additional scalar
degree of freedom, but rather by the exchange of Kaluza--Klein (KK) gauge
bosons. This suggests that perhaps the SM Higgs could be completely eliminated
in favor of some KK towers of gauge fields. We show that from the low-energy
effective theory perspective this seems to be indeed possible. We display an
extra dimensional toy model, where BC's introduce a symmetry breaking pattern
and mass spectrum that resembles that in the standard model.


title: Petite Unification of Quarks and Leptons: Twenty Two Years After

abstract:
  A recent surge of interest in the {\em early} unification of quarks and
leptons, has prompted us to revive a paper \cite{HBB} written twenty two years
ago. We provided there a general discussion of quark-lepton unification
characterized by the gauge group $G_{S} \otimes G_{W}$ with two couplings $g_S$
and $g_W$ and by the unification mass scales $10\tev-1000\tev$. The constraint
from $\sin^2 \theta_{W}$ restricts the choices for $G_W$ and our favorite model
was chosen to be $SU(4)_{\rm PS}\otimes SU(2)^4$. We review the main results of
\cite{HBB}, update the original $SU(4)_{\rm PS}\otimes SU(2)^4$ model and
propose two new models based on the groups $SU(4)_{\rm PS}\otimes SU(2)^3$ and
$SU(4)_{\rm PS}\otimes SU(3)^2$ for which the consistency with the measured
value of $\sin^{2}\theta_{W}(M_{Z}^{2})$ determines the unification scale to be
roughly $1 {\rm TeV}$ and $3-10 {\rm TeV}$, respectively. The implications of
this very early unification is the existence of new quarks and leptons with
charges up to 4/3 (for quarks) and 2 (for leptons) and masses $\ord(250\gev)$.
Interestingly, in these models the rare decay $K_L\to \mu e$ is automatically
absent at tree level and the one-loop contributions are consistent with the
experimental upper bound for this decay.


title: J/Psi Production in p+p Collisions at sqrt(s) = 200 GeV

abstract:
  Total and differential cross sections for inclusive $J/\psi$ production have
been measured in $\sqrt{s} =$ 200 GeV proton-proton collisions at BNL-RHIC.
$J/\psi$ particles have been identified via $\mu^{+}\mu^{-}$ decays measured in
the forward muon spectrometer covering $1.2 < y < 2.2$ and via $e^{+}e^{-}$
decays measured in the mid-rapidity spectrometers of the PHENIX experiment.
Details of the muon channel measurement are presented in this paper based upon
an 81-nb$^{-1}$ integrated luminosity obtained in the first p+p run at RHIC.
Results are compared with previous experiments as well as theoretical model
predictions.


title: Using Geant4 in the BaBar Simulation

abstract:
  Babar was the first large experiment to incorporate Geant4 into its detector
simulation. Since July 2001, 1.5 billion Babar events have been produced using
this simulation. In a typical e+e- -> Upsilon(4s) -> B0 B0bar event, between 30
and 60 tracks are produced in the generator and propagated through the
detector, using decay, electromagnetic and hadronic processes provided by the
Geant4 toolkit. The material model of the detector is very detailed and a
special particle transportation module was developed so that minute features
(on the few micron scale) would be sampled in the propagation without
sacrificing performance. The propagation phase for such an event requires 5 CPU
seconds on an 866 MHz processor. Execution speeds for other Babar event types
will also be presented. Validation of simulated events with Babar data is
ongoing, and results of Monte Carlo/data comparisons will be shown. A
discussion of the design of the simulation code, how the Geant4 toolkit is
used, and ongoing efforts to improve the agreement between data and Monte Carlo
will also be presented.


title: Problems of the rotating-torsion-balance limit on the photon mass

abstract:
  We discuss the problems (and the promise) of the ingenious method introduced
by Lakes, and recently improved on by Luo, to detect a possible small photon
mass $\mu$ by measuring the ambient magnetic vector potential from large scale
magnetic fields. We also point out how an improved ``indirect'' limit can be
obtained using modern measurements of astrophysical magnetic fields and plasmas
and that a good ``direct'' limit exists using properties of the solar wind.


title: Lepton polarization asymmetries in $B \to X_s \tau^+ \tau^-$ in MSSM

abstract:
  Semi-leptonic and leptonic decays of B-mesons are important probes for
testing SM and theories beyond it because of their relative cleanliness and far
less theoretical uncertainties. In semi-leptonic decays based on quark level
transition $b \to s \tau^+ \tau^-$ apart from branching ratio one can study
many other (possible) observables associated with final state leptons like,
lepton pair Forward Backward asymmetry, lepton polarization asymmetries etc.
But as proposed recently if we can tag the B-meson than one can measure the
polarization asymmetries of both the leptons. Here we will study the
polarization asymmetries of both the final state leptons in SM and Minimal
Supersymmetric Extension (MSSM) to it.


title:
Tri-bimaximal mixing, discrete family symmetries, and a conjecture
  connecting the quark and lepton mixing matrices

abstract:
  Neutrino oscillation experiments (excluding the LSND experiment) suggest a
tri-bimaximal form for the lepton mixing matrix. This form indicates that the
mixing matrix is probably independent of the lepton masses, and suggests the
action of an underlying discrete family symmetry. Using these hints, we
conjecture that the contrasting forms of the quark and lepton mixing matrices
may both be generated by such a discrete family symmetry. This idea is that the
diagonalisation matrices out of which the physical mixing matrices are composed
have large mixing angles, which cancel out due to a symmetry when the CKM
matrix is computed, but do not do so in the MNS case. However, in the cases
where the Higgs bosons are singlets under the symmetry, and the family symmetry
commutes with SU(2)L, we prove a no-go theorem: no discrete unbroken family
symmetry can produce the required mixing patterns. We then suggest avenues for
future research.


title: Nonsymmetric Gravity and Noncommutative Signals

abstract:
  Models in which the space-time metric $g_{\mu\nu}$ is not symmetric, $i.e.$
$g_{\mu\nu} \ne g_{\nu\mu}$ may make predictions in scattering experiments, for
example in a future $e^+e^-$ linear collider, similar to those from
noncommutative field theory. We compute the differential cross sections for
pair annihilation, Bhabha and M$\o$ller scattering and find that both
nonsymmetric gravity theory(NGT) and noncommutative field theory predict a
similar dependence of the differential cross section on the azimuthal angle in
agreement with all known data, however in NGT Lorentz violation need not be as
severe. Astrophysical and cosmological tests may prove very useful in
distinguishing these two theories.


title: TASI 2002 lectures on neutrinos

abstract:
  We present a pedagogical review of neutrino physics. In the first lecture we
describe the theoretical motivation for neutrino masses, and explain how
neutrino flavor oscillation experiments can probe neutrino masses. In the
second lecture we review the experimental data, and show that it is best
explained if neutrinos are massive. In the third lecture we explain what are
the theoretical implications of the data, in particular, what are the
challenges they impose on models of physics beyond the SM. We give examples of
theoretical models that cope with some of these challenges.


title: Soft diffraction dissociation

abstract:
  We refute past suggestions that the data on soft diffraction dissociation
demand modifications to conventional Regge theory.


title: Using nu_e -> nu_tau: golden and silver channels at the Neutrino Factory

abstract:
  I briefly review the source of the so-called intrinsic ambiguity and show how
the combination of ``golden'' and ``silver'' channel at the Neutrino Factory
can solve the problem, in the absence of other sources of degeneracies. I then
relaxed the hypothesis $\theta_{23} = 45^\circ$ and show how the different
dependence of the two channels on $\theta_{23}$ can help in solving the
intrinsic and $\theta_{23}$-octant ambiguity at the same time.


title:
Complete Two Loop Electroweak Contributions to the Muon Lifetime in the
  Standard Model

abstract:
  An independent result for the two loop fermionic contributions to the muon
lifetime in the Standard Model is obtained. Deviations are found with respect
to \cite{Freitas:2000gg}, which result in a shift of the W boson mass by
approximately -1.3 MeV over the range of Higgs boson masses from 100 GeV to 1
TeV. Supplied with the bosonic contributions from
\cite{Awramik:2002wn,Onishchenko:2002ve,Awramik:2002vu}, this shift, due to the
complete electroweak contributions, varies from -2.4 MeV to -0.6 MeV.
Additionally, a new test of the matching procedure defining the Fermi constant
is presented, which uses fermion masses as infrared regulators.


title: Recent developments in rare kaon decays

abstract:
  We discuss issues in rare and radiative kaon decays. The interest is to
extract useful short-distance information and uncover underlying dynamics. We
emphasize channels where either we can understand non-perturbative aspects of
QCD or there is a chance to test the Standard Model.


title:
Improved full one--loop corrections to A^0 -> \sq_1 \sq_2 and \sq_2 ->
  \sq_1 A^0

abstract:
  We calculate the full electroweak one-loop corrections to the decay of the
CP-odd Higgs boson A^0 into scalar quarks in the minimal supersymmetric
extension of the Standard Model (MSSM). Due to the complex structure of the
electroweak sector a proper renormalization of many parameters in the on-shell
renormalization scheme is necessary. For the decay into sbottom quarks,
especially for large tanb, the corrections can be very large in the on-shell
renormalization scheme, which makes the perturbation series unreliable. We
solve this problem by an appropriate definition of the tree-level coupling in
terms of running quark masses and running trilinear couplings A_q. We also
discuss the decay of heavy scalar quarks into light scalar quarks and A^0. We
find that the corrections are significant and therefore cannot be neglected.


title: Two-loop corrections to the decay rate of parapositronium

abstract:
  Order $\alpha^2$ corrections to the decay rate of parapositronium are
calculated. A QED scattering calculation of the amplitude for electron-positron
annihilation into two photons at threshold is combined with the technique of
effective field theory to determine an NRQED Hamiltonian, which is then used in
a bound state calculation to determine the decay rate. Our result for the
two-loop correction is $5.1243(33)$ in units of $(\alpha/\pi)^2$ times the
lowest order rate. This is consistent with but more precise than the result
$5.1(3)$ of a previous calculation.


title: Matching NLO QCD and parton showers in heavy flavour production

abstract:
  We apply the MC@NLO approach to the process of heavy flavour hadroproduction.
MC@NLO is a method for matching next-to-leading order (NLO) QCD calculations
and parton shower Monte Carlo (MC) simulations, with the following features:
fully exclusive events are generated, with hadronisation according to the MC
model; total rates are accurate to NLO; NLO results for distributions are
recovered upon expansion in $\as$; hard emissions are treated as in NLO
computations while soft/collinear emissions are handled by the MC simulation,
with the same logarithmic accuracy as the MC; matching between the hard and
soft regions is smooth, and no intermediate integration steps are necessary.
The method was applied previously to the hadroproduction of gauge boson pairs,
which at NLO involves only initial-state QCD radiation and a unique colour
structure. In heavy flavour production, it is necessary to include
contributions from final-state QCD radiation and different colour flows. We
present illustrative results on top and bottom production at the Tevatron and
LHC.


title:
Inclusive vector charmonium production in two-photon e^+ e^-
  -annihilation at \sqrt{s}=10.6 GeV

abstract:
  In this paper we study inclusive production of vector charmonium states
$J/\psi$ or $\psi(2S)$ in two-photon $\epem$-annihilation at $\sqrt s=10.6 \rm
GeV$ using color-singlet model. Analytic expressions for differential cross
sections, numerical values of total cross sections and plots of different
distributions are presented. These distributions differ significantly from the
one-photon case so these modes can be easily separated.


title: Extending QCD perturbation theory to higher energies

abstract:
  On the basis of the results of a new renormalisation group improved small-x
resummation scheme, we argue that the range of validity of perturbative
calculations is considerably extended in rapidity with respect to leading log
expectations. We thus provide predictions for the energy dependence of the
gluon Green function in its perturbative domain and for the resummed splitting
function. As in previous analyses, high-energy exponents are reduced to
phenomenologically acceptable values. Additionally, interesting preasymptotic
effects are observed. In particular, the splitting function shows a shallow dip
in the moderate small-x region, followed by the expected power increase.


title:
A combined analysis of short-baseline neutrino experiments in the (3+1)
  and (3+2) sterile neutrino oscillation hypotheses

abstract:
  We investigate adding two sterile neutrinos to resolve the apparent tension
existing between short-baseline neutrino oscillation results and
CPT-conserving, four-neutrino oscillation models. For both (3+1) and (3+2)
models, the level of statistical compatibility between the combined dataset
from the null short-baseline experiments Bugey, CHOOZ, CCFR84, CDHS, KARMEN,
and NOMAD, on the one hand; and the LSND dataset, on the other, is computed. A
combined analysis of all seven short-baseline experiments, including LSND, is
also performed, to obtain the favored regions in neutrino mass and mixing
parameter space for both models. Finally, four statistical tests to compare the
(3+1) and the (3+2) hypotheses are discussed. All tests show that (3+2) models
fit the existing short-baseline data significantly better than (3+1) models.


title:
Black hole multiplicity at particle colliders (Do black holes radiate
  mainly on the brane?)

abstract:
  If gravity becomes strong at the TeV scale, we may have the chance to produce
black holes at particle colliders. In this paper we study some experimental
signatures of black hole production in TeV-gravity theories. In contrast with
the usual lore, we show that the black hole energy loss in the bulk during the
Hawking evaporation phase may be of the same order of the energy radiated into
the brane. We investigate in detail the multiplicity of the decay products of
black hole evaporation. We find that the number of particles produced during
the evaporation phase is significantly lower than the average multiplicity
which has been used in the past literature.


title: Mixing and oscillations of neutral particles in Quantum Field Theory

abstract:
  We study the mixing of neutral particles in Quantum Field Theory: neutral
boson field and Majorana field are treated in the case of mixing among two
generations. We derive the orthogonality of flavor and mass representations and
show how to consistently calculate oscillation formulas, which agree with
previous results for charged fields and exhibit corrections with respect to the
usual quantum mechanical expressions.


title: Chiral symmetry aspects of positive and negative parity baryons

abstract:
  Chiral symmetry aspects for baryon properties are studied. After a brief
discussion on general framework, we introduce two distinctive chiral group
representations for baryons: the naive and mirror assignments. Using linear
sigma models, nucleon properties are studied in both representations. Finally,
we propose an experiment to distinguish the two assignments in the reactions of
pion and eta productions.


title:
Relative phase between strong and electromagnetic amplitudes in psi(2S)
  to 0- 0- decays

abstract:
  With the known branching ratios of psi(2S) to pi+pi- and psi(2S) to K+K-, the
branching ratio of psi(2S) to K0short K0long is calculated as a function of the
relative phase between the strong and the electromagnetic amplitudes of the
psi(2S) decays. The study shows that the branching ratio of psi(2S) to K0short
K0long is sensitive to the relative phase and a measurement of the K0short
K0long branching ratio will shed light on the relative phase determination in
psi(2S) to 0- 0- decays.


title: Electromagnetic corrections in hadronic processes

abstract:
  In quantum field theory, the splitting of the Hamiltonian into a strong and
an electromagnetic part cannot be performed in a unique manner. We propose a
convention for disentangling these two effects: one matches the parameters of
two theories -- with and without electromagnetic interactions -- at a given
scale mu_1, referred to as the matching scale. This procedure enables one to
analyze the separation of strong and electromagnetic contributions in a
transparent manner. We illustrate the method -- in the framework of the loop
expansion -- in a Yukawa model, as well as in the linear sigma model, where we
also investigate the corresponding low-energy effective theory.


title: Scalar Dark Matter candidates

abstract:
  We investigate the possibility that Dark Matter (dm) could be made of scalar
candidates and focus, in particular, on the unusual mass range between a few
MeV's and a few GeV's. After showing why the Lee-Weinberg limit (which usually
forbids a dm mass below a few GeV's) does not necessarily apply in the case of
scalar particles, we discuss how light candidates (mdm < O(GeV)) can satisfy
both the gamma ray and relic density constraints. We find two possibilities.
Either dm is coupled to heavy fermions (but if $mdm \lesssim 100$ MeV, an
asymmetry between the dm particle and antiparticle number densities is likely
to be required), or dm is coupled to a new light gauge boson U. The
(collisional) damping of light candidates is, in some circumstances, large
enough to be mentioned, but in most cases too small to generate a non linear
matter power spectrum at the present epoch that differs significantly from the
Cold Dark Matter spectrum. On the other hand, heavier scalar dm particles (ie
with $mdm \gtrsim O(GeV)$) turn out to be much less constrained. We finally
discuss a theoretical framework for scalar candidates, inspired from theories
with N=2 extended supersymmetry and/or extra space dimensions, in which the dm
stability results from a new discrete (or continuous) symmetry.


title: The factorizable amplitude in $B^0 \to \pi^+ \pi^-$

abstract:
  Using the measured spectrum shape for $B \to \pi \ell \nu$, the rate for $B^+
\to \pi^+ \pi^0$, information on the Cabibbo-Kobayashi-Maskawa (CKM) matrix
element $|V_{ub}|$, and theoretical inputs from factorization and lattice gauge
theory, we obtain an improved estimate of the ``tree'' contribution to $B^0 \to
\pi^+ \pi^-$. We find the branching ratio $\b(B^0 \to \pi^+ \pi^-)|_{\rm tree}
= (5.25^{+1.67}_{-0.50}) \times 10^{-6}$, to be compared with the experimental
value $\b(B^0 \to \pi^+ \pi^-) = (4.55 \pm 0.44) \times 10^{-6}$. The fit
implies $|V_{ub}| = (3.62 \pm 0.34) \times 10^{-3}$. Implications for
tree-penguin interference in $B^0 \to \pi^+ \pi^-$ and for other charmless $B$
decays are discussed.


title: Factorisation fits and the unitarity triangle

abstract:
  In this paper we present fits to charmless hadronic B decay data from the
BaBar, Belle and Cleo experiments using models by Beneke et. al. and Ciuchini
et al. When we include the data from pseudo-scalar vector decays (PV) the
current experimental results favour the inclusions of a so-called "charming
penguin" term. We also present fit results for the Unitary Triangle parameters
and the CP violating asymmetries


title:
The 3-D O(4) universality class and the phase transition in two-flavor
  QCD

abstract:
  We determine the critical equation of state of the three-dimensional O(4)
universality class. We first consider the small-field expansion of the
effective potential (Helmholtz free energy). Then, we apply a systematic
approximation scheme based on polynomial parametric representations that are
valid in the whole critical regime, satisfy the correct analytic properties
(Griffiths' analyticity), take into account the Goldstone singularities at the
coexistence curve, and match the small-field expansion of the effective
potential. From the approximate representations of the equation of state, we
obtain estimates of several universal amplitude ratios.
  The three-dimensional O(4) universality class is expected to describe the
finite-temperature chiral transition of quantum chromodynamics with two light
flavors. Within this picture, the O(4) critical equation of state relates the
reduced temperature, the quark masses, and the condensates around T_c in the
limit of vanishing quark masses.


title:
Saturation and parton level Cronin effect: enhancement vs suppression of
  gluon production in p-A and A-A collisions

abstract:
  We note that the phenomenon of perturbative saturation leads to transverse
momentum broadening in the spectrum of partons produced in hadronic collisions.
This broadening has a simple interpretation as parton level Cronin effect for
systems in which saturation is generated by the "tree level" Glauber-Mueller
mechanism. For systems where the broadening results form the nonlinear QCD
evolution to high energy, the presence or absence of Cronin effect depends
crucially on the quantitative behavior of the gluon distribution functions at
transverse momenta kt outside the so called scaling window. We discuss the
relation of this phenomenon to the recent analysis by Kharzeev-Levin-McLerran
of the momentum and centrality dependence of particle production in
nucleus-nucleus collisions at RHIC.


title: Beauty Production at HERA, proceedings for Moriond QCD03 Conference

abstract:
  The results of measurement of beauty quark production at HERA performed by
the H1 and ZEUS collaborations are presented. Total cross sections and the
differential cross sections have been measured in both the photoproduction and
the deep inelastic scattering regimes. The results are compared with the NLO
QCD calculations.


title: Exploring CP Violation through B Decays

abstract:
  The B-meson system provides many strategies to perform stringent tests of the
Standard-Model description of CP violation. In this brief review, we discuss
implications of the currently available B-factory data on the angles alpha,
beta and gamma of the unitarity triangle, emphasize the importance of Bs
studies at hadronic B experiments, and discuss new, theoretically clean
strategies to determine gamma.


title: Triple product correlations in B --> anti-Lambda p pi

abstract:
  Triple product correlations (TPC's) involving strange quark spin are
elucidated in b --> u u(bar) s process within the standard model. They arise
when light quark masses are nonzero. As the momenta and spins of constituent
quarks are related to that of the parent hadron, the quark masses are, however
small, important and relevant in TPC studies. At this level the TPC's of
interest are of the form s_s.[p_u X p_u(bar)] and s_s.[p_s X p_u]. As an
application, we look at T-violating effects in B --> anti-Lambda p pi through
the TPC s_\Lambda.[p_\Lambda X p_p] for which triple product asymmetry is found
to be 5.7%-7.6% in the vanishing limit of the strong phase.


title: Hunting for glueballs in electron-positron annihilation

abstract:
  We calculate the cross section for the exclusive production of J^{PC}=0^{++}
glueballs G_0 in association with the J/psi in e^+e^- annihilation using the
pQCD factorization formalism. The required long-distance matrix element for the
glueball is bounded by CUSB data from a search for resonances in radiative
Upsilon decay. The cross section for e^+e^- -> J/psi+ G_0 at sqrt{s}=10.6 GeV
is similar to exclusive charmonium-pair production e^+e^- -> J/psi+h for
h=eta_c and chi_{c0}, and is larger by a factor 2 than that for h=eta_{c}(2S).
As the subprocesses gamma^* -> (c c-bar) (c c-bar) and gamma^* -> (c c-bar) (g
g) are of the same nominal order in perturbative QCD, it is possible that some
portion of the anomalously large signal observed by Belle in e^+ e^- -> J/psi X
may actually be due to the production of charmonium-glueball J/psi G_J pairs.


title:
Supersymmetric Froggatt-Nielsen Models with Baryon- and Lepton-Number
  Violation

abstract:
  We systematically investigate the embedding of U(1)_X Froggatt-Nielsen models
in (four-dimensional) local supersymmetry. We restrict ourselves to models with
a single flavon field. We do not impose a discrete symmetry by hand, e.g.
R-parity, baryon-parity or lepton-parity. Thus we determine the order of
magnitude of the baryon- and/or lepton violating coupling constants through the
Froggatt-Nielsen mechanism. We then scrutinize whether the predicted coupling
constants are in accord with weak or GUT scale constraints. Many models turn
out to be incompatible.


title: Domain wall generation by fermion self-interaction and light particles

abstract:
  A possible explanation for the appearance of light fermions and Higgs bosons
on the four-dimensional domain wall is proposed. The mechanism of light
particle trapping is accounted for by a strong self-interaction of
five-dimensional pre-quarks. We obtain the low-energy effective action which
exhibits the invariance under the so called \tau-symmetry. Then we find a set
of vacuum solutions which break that symmetry and the five-dimensional
translational invariance. One type of those vacuum solutions gives rise to the
domain wall formation with consequent trapping of light massive fermions and
Higgs-like bosons as well as massless sterile scalars, the so-called branons.
The induced relations between low-energy couplings for Yukawa and scalar field
interactions allow to make certain predictions for light particle masses and
couplings themselves, which might provide a signature of the higher dimensional
origin of particle physics at future experiments. The manifest translational
symmetry breaking, eventually due to some gravitational and/or matter fields in
five dimensions, is effectively realized with the help of background scalar
defects. As a result the branons acquire masses, whereas the ratio of Higgs and
fermion (presumably top-quark) masses can be reduced towards the values
compatible with the present-day phenomenology. Since the branons do not couple
to fermions and the Higgs bosons do not decay into branons, the latter ones are
essentially sterile and stable, what makes them the natural candidates for the
dark matter in the Universe.


title: SU(2)xSU(2) nonlocal quark model with confinement

abstract:
  The nonlocal version of the SU(2)xSU(2) symmetric four-quark interaction of
the NJL type is considered. Each of the quark lines contains the form factors.
These form factors remove the ultraviolet divergences in quark loops. The
additional condition on quark mass function m(p) ensures the absence of the
poles in the quark propagator(quark confinement). The constituent quark mass
m(0) is expressed thought the cut-off parameter Lambda, m(0)=Lambda=340 MeV in
the chiral limit. These parameters are fixed by the experimental value of the
weak pion decay and allow us to describe the mass of the light scalar meson,
strong decay rho -> pi pi and D/S ratio in the decay a_1 -> rho pi in
satisfactory agreement with experimental data.


title:
Running Neutrino Masses, Mixings and CP Phases: Analytical Results and
  Phenomenological Consequences

abstract:
  We derive simple analytical formulae for the renormalization group running of
neutrino masses, leptonic mixing angles and CP phases, which allow an easy
understanding of the running. Particularly for a small angle theta_13 the
expressions become very compact, even when non-vanishing CP phases are present.
Using these equations we investigate: (i) the influence of Dirac and Majorana
phases on the evolution of all parameters, (ii) the implications of running
neutrino parameters for leptogenesis, (iii) changes of the mass bounds from
WMAP and neutrinoless double beta decay experiments, relevant for high-energy
mass models, (iv) the size of radiative corrections to theta_13 and theta_23
and implications for future precision measurements.


title: Impact of $U_{e3}$ on Neutrino Models

abstract:
  We have discussed the impact of $U_{e3}$ on the model of the neutrino mass
matrix. In order to get the small $U_{e3}$, some flavor symmetry is required.
Typical two models are investigated. The first one is the model in which the
bi-maximal mixing is realized at the symmetric limit. The second one is the
texture zeros of the neutrino mass matrix.


title:
What Precision Electroweak Physics Says About the SU(6)/Sp(6) Little
  Higgs

abstract:
  We study precision electroweak constraints on the close cousin of the
Littlest Higgs, the SU(6)/Sp(6) model. We identify a near-oblique limit in
which the heavy W' and B' decouple from the light fermions, and then calculate
oblique corrections, including one-loop contributions from the extended top
sector and the two Higgs doublets. We find regions of parameter space that give
acceptably small precision electroweak corrections and only mild fine tuning in
the Higgs potential, and also find that the mass of the lightest Higgs boson is
relatively unconstrained by precision electroweak data. The fermions from the
extended top sector can be as light as 1 TeV, and the W' can be as light as 1.8
TeV. We include an independent breaking scale for the B', which can still have
a mass as low as a few hundred GeV.


title: Hybrid Dirac Fields

abstract:
  Hybrid Dirac fields are fields that are general superpositions of the
annihilation and creation parts of four Dirac spin 1/2 fields,
$\psi^{(\pm)}(x;\pm m)$, whose annihilation and creation parts obey the Dirac
equation with mass $m$ and mass $-m$. We discuss a specific case of such
fields, which has been called ``homeotic.'' We show for this case, as is true
in general for hybrid Dirac fields (except the ordinary fields whose
annihilation and creation parts both obey one or the other Dirac equation),
that (1) any interacting theory violates both Lorentz covariance and causality,
(2) the discrete transformations $\mathcal{C}$, and $\mathcal{CPT}$ map the
pair $\psi_h(x)$ and $\bar{\psi}_h(x)$ into fields that are not linear
combinations of this pair, and (3) the chiral projections of $\psi_h(x)$ are
sums of the usual Dirac fields with masses $m$ and $-m$; on these chiral
projections $\mathcal{C}$, and $\mathcal{CPT}$ are defined in the usual way,
their interactions do not violate $\mathcal{CPT}$, and interactions of chiral
projections are Lorentz covariant and causal. In short, the main claims
concerning ``homeotic'' fields are incorrect.


title: Charm coalescence at relativistic energies

abstract:
  The J/psi yield at midrapidity at the top RHIC (relativistic heavy ion
collider) energy is calculated within the statistical coalescence model, which
assumes charmonium formation at the late stage of the reaction from the charm
quarks and antiquarks created earlier in hard parton collisions. The results
are compared to the new PHENIX data and to predictions of the standard models,
which assume formation of charmonia exclusively at the initial stage of the
reaction and their subsequent suppression. Two versions of the suppression
scenario are considered. One of them assumes gradual charmonium suppression by
comovers, while the other one supposes that the suppression sets in abruptly
due to quark-gluon plasma formation. Surprisingly, both versions give very
similar results. In contrast, the statistical coalescence model predicts a few
times larger $J/\psi$ yield in the most central collisions.


title:
Calculation of Rare Decay B^+ \to D_s^+ \bar K^{*0} in Perturbative QCD
  Approach

abstract:
  The rare decay B^+ \to D_s^+ \bar K^{*0} can occur only via annihilation
diagrams in the Standard Model. We calculate the branching ratio in
perturbative QCD approach based on k_T factorization theorem. We found that the
branching ratio of this decay is about of order 10^{-8}, which may be sensitive
to new physics.


title: Cosmological constant, renormalization group and Planck scale physics

abstract:
  Starting from generic quantum effects at the Planck scale M_P, we find that
the renormalization group running of the cosmological constant (CC) at low
energies is possible if there is a smooth decoupling of all massive particles
from M_P to the mass of the lightest neutrino. We discuss the theoretical
implications of this running for the ``old'' and ``new'' cosmological constant
problems. Interestingly enough, the CC running implies a strong relationship
between quantum field theory and cosmology, which should be observable in the
near future in experiments such as SNAP through the measurement of a cubic
redshift dependence of the CC.


title: Extrema bounds for the soft Pomeron intercept

abstract:
  By using an extended Regge parametrization and taking into account the
discrepancies in the high-energy pp and p(bar)p total cross section data, in
both accelerator and cosmic-ray regions, we estimate extrema bounds for the
soft Pomeron intercept. First we consider two ensembles of data with either the
CDF or the E710 and E811 results for the p(bar)p total cross section at 1.8
TeV, from which we obtain the bounds 1.102 and 1.081, respectively. These
ensembles are then combined with the highest and lowest estimations for the pp
total cross section from cosmic-ray experiments (6-40 TeV), leading to the
upper and lower bounds 1.109 and 1.082, respectively. The effects of
simultaneous fits to total cross sections and the rho parameter, individual
fits to total cross sections, and the influence of the subtraction constant in
the dispersion relations are also presented. Our global results favor the E710
and E811 data.


title:
New spectral representation and evaluation of f_\pi and the quark
  condensate <\bar q q> in the terms of string tension

abstract:
  New spectral representations for f_\pi and chiral condensate are derived in
QCD and used for calculations in the large N_c limit. Both quantities are
expressed in this limit through string tension \sigma and gluon correlation
length T_g without fitting parameters. As a result one obtains <\bar q q> = -
N_c\sigma^2 T_g a_1, f_\pi =\sqrt{N_c} \sigma T_g a_2, with a_1=0.0823,
a_2=0.30. Taking \sigma=0.18 GeV^2 and T_g=1 GeV^(-1), as known from analytic
and lattice calculations, this yields <\bar q q>(\mu=2 GeV)=-(0.225 GeV)^3,
f_\pi=0.094 GeV, which is close to the standard values.


title: Associated Higgs boson production with heavy quarks

abstract:
  The production of a Higgs boson in association with a pair of t-tbar quarks
will play a very important role at both hadron and lepton colliders. We review
the status of theoretical predictions and their relevance to Higgs boson
studies, with particular emphasis on the recently calculated NLO QCD
corrections to the inclusive cross section for p-pbar,pp -> t-tbar-h. We
conclude by briefly discussing the case of exclusive b-bbar-h production and
the potential of this process in revealing signals of new physics beyond the
Standard Model.


title:
The rare $\bar{B}^0_{d} \to \phi\gamma$ decays in Standard Model and as
  a probe of R-parity violation

abstract:
  We present the first study of the rare annihilation decay $\bar{B}^0_d \to
\phi\gamma$ in the Standard Model. Using QCD factorization formalism, we find
${\cal B}(\bar{B}^0_d \to\phi\gamma)=3.6\times 10^{-12}$. The smallness of the
decay rate in the Standard Model make the decay a sensitive probe of new
physics contributions. As an example, we calculate the effects of R-parity
violating couplings. Within the available upper bounds for
$|\lambda^{''}_{i23}\lambda^{''}_{i12}|$ and
$|\lambda^{'}_{i32}\lambda^{'*}_{i12}|$, ${\cal B}(\bar{B}^0_d \to\phi\gamma)$
could be enhanced to order of $10^{-9}\sim 10^{-8}$, which might be accessible
at LHCB, B-TeV and the planning super high luminosity B factories at KEK and
SLAC.


title: Strangeness and Quark Gluon Plasma

abstract:
  A brief summary of strangeness mile stones is followed by a chemical
non-equilibrium statistical hadronization analysis of strangeness results at
SPS and RHIC. Strange particle production in AA interactions at
\sqrt{s_{NN}}\ge 8.6 GeV can be understood consistently as originating from the
deconfined quark--gluon plasma in a sudden hadronization process. Onset of QGP
formation as function of energy is placed in the beam energy interval 10--30A
GeV/c. Strangeness anomalies at LHC are described.


title: Charmonium Hybrid Production in Exclusive B Meson Decays

abstract:
  Recent data on charmonium production in B-meson decays suggest that
charmonium hybrid mesons with mass ~4 GeV may be produced in B-decay via
c\bar{c} colour octet operators. Some of these states are likely to be narrow
with clean signatures to J/\psi pi^+ pi^- final states. Experimental signatures
and search strategies for existing B-factories are described.


title: Supergravity Minimal Inflation and its Spectral Index Revisited

abstract:
  Natural supergravity models of new inflation are reconsidered as minimal
inflationary models within slow-roll approximation. Their running spectral
index is derived in a revised form with recent observational results and future
refinements in mind. This will possibly determine essential model parameters
with respect to Planck-suppressed operators.


title: Radiation and evolution of small relativistic dipole in QED

abstract:
  We study in the quasiclassical approximation the radiation reaction and its
influence on the space-time evolution for the small relativistic dipole moving
in a constant external electromagnetic field in QED.


title: A Note on Doubly-Charged Higgs Pair Production at Hadron Colliders

abstract:
  We analyze the next-to-leading order QCD corrections to the production of
doubly-charged Higgs particles at hadron colliders in extensions of the SM with
Higgs isospin triplets. At both the Tevatron and the LHC, these corrections are
found to be moderate in size increasing the cross sections by about 20--30%.
The residual theoretical uncertainties are of the order of 10--15% which is
sufficient for experimental searches for these particles at the Tevatron and
LHC.


title: The Pomeron in Exclusive $J/\psi$ Vector Meson Production

abstract:
  An earlier developed model for vector meson photoproduction, based on a
dipole Pomeron exchange, is extended to electroproduction. Universality of the
non linear Pomeron trajectory is tested by fitting the model to ZEUS and H1
data as well as to CDF data on $\bar pp$ elastic scattering


title:
Lepton Dipole Moments and Rare Decays in the CP-violating MSSM with
  Nonuniversal Soft-Supersymmetry Breaking

abstract:
  We investigate the muon anomalous magnetic dipole moment (MDM), the muon
electric dipole moment (EDM) and the lepton-flavour-violating decays of the
$\tau-$lepton, $\tau \to \mu \gamma$ and $\tau\to 3\mu$, in the CP-violating
Minimal Supersymmetric Standard Model (MSSM) with nonuniversal
soft-supersymmetry breaking. We evaluate numerically the muon EDM and the
branching ratios $B(\tau \to \mu\gamma)$ and $B(\tau \to 3\mu)$, after taking
into account the experimental constraints from the electron EDM and muon MDM.
Upon imposition of the experimental limits on our theoretical predictions for
the aforementioned branching ratios and the muon MDM, we obtain an upper bound
of about $10^{-23} e\cdot cm$ on the muon EDM which lies well within the
explorable reach of the proposed experiment at BNL.


title: R-Parity Violation in a SUSY GUT Model and Radiative Neutrino Masses

abstract:
  Within the framework of an SU(5) SUSY GUT model, a mechanism which
effectively induces R-parity-violating terms below the unification energy scale
M_X is proposed. The model has matter fields \bar{5}_{L(+)}+10_{L(-)} and Higgs
fields H_{(-)} and \bar{H}_{(+)} in addition to the ordinary Higgs fields
H_{(+)} and \bar{H}_{(-)} which contribute to the Yukawa interactions, where
(\pm) denote the transformation properties under a discrete symmetry Z_2. The
Z_2 symmetry is only broken by the \mu-term \bar{H}_{(+)}H_{(-)} softly, so
that the \bar{5}_{(+)}\leftrightarrow \bar{H}_{(+)} \leftrightarrow
\bar{H}_{(-)} mixing appears at \mu < m_{SB}, i.e. R-parity violating terms
\bar{5}_L\bar{5}_L 10_L are effectively induced from the Yukawa interactions
\bar{H}_{(-)}\bar{5}_{L(+)}10_{L(-)}, so that the effective coupling constants
\lambda_{ijk} of \nu_{Li} e_{Lj} e_{Rk}^c and \nu_{Li} d_{Rj}^c d_{Lk} are
proportional to the mass matrices (M_e^*)_{jk} and (M_d^\dagger)_{jk},
respectively. The parameter regions which are harmless for the proton decay are
investigated. Possible forms of the radiatively induced neutrino mass matrix
are also investigated.


title: Meson-Baryon Scattering in QCD_2 for any Coupling

abstract:
  Extending earlier work on strong-coupling meson-baryon scattering in QCD_2,
we derive the effective meson-baryon action for any value of the coupling
constant, in the large-N_c limit. Colour degrees of freedom play an important
role, and we show that meson-baryon scattering can be formulated as a
relativistic potential problem. We distinguish two cases that are non-trivial
for unequal quark masses, and present the resulting equations for meson-baryon
scattering amplitudes.


title: A new method for calculating jet-like QED processes

abstract:
  We consider inelastic QED processes, the cross sections of which do not drop
with increasing energy. Such reactions have the form of two-jet processes with
the exchange of a virtual photon in the t-channel. We consider them in the
region of small scattering angles m/E <= theta << 1, which yield the dominant
contribution to their cross sections. A new effective method is presented to
calculate the corresponding helicity amplitudes. Its basic idea consists in
replacing spinor structures for real and weakly virtual intermediate leptons by
simple transition vertices for real leptons. The obtained compact amplitudes
are particularly suitable for numerical calculations in jet-like kinematics.


title: Exotic Hadrons Of Minimal Pentaquark ($qqqq\Bar{Q}$) States

abstract:
  It is shown that the exotic non-qqq hadrons of pentaquark $qqqq\bar{q}$
states can be clearly distinguished from the conventional qqq-baryon resonances
or their hybrids if the flavor of $\bar{q}$ is different from any of the other
four quarks. We suggest the physical process $p(e,e'K^-)Z(uuud\bar{s})$, which
can be investigated at the Thomas Jefferson National Accelerator Facility
(JLab), as an ideal process to search for the existence or non-existence of the
exotic hadron of minimal pentaquark state $Z(uuud\bar{s})$. (The search for the
existence of $Z(uudd\bar{s})$ is also discussed in the paper. We added this
sentence after the original published form of this paper.)


title: Parameter degeneracy and reactor experiments

abstract:
  Degeneracies of the neutrino oscillation parameters are explained using the
$\sin^22\theta_{13}$--$s^2_{23}$ plane. Measurements of $\sin^22\theta_{13}$ by
reactor experiments are free from the parameter degeneracies which occur in
accelerator appearance experiments, and reactor experiments play a role
complementary to accelerator experiments. It is shown that the reactor
measurement may be able to resolve the degeneracy in $\theta_{23}$ if
$\sin^22\theta_{13}$ and $\cos^22\theta_{23}$ are relatively large.


title:
Effects to Scalar Meson Decays of Strong Mixing between Low and High
  Mass Scalar Mesons

abstract:
  We analyze the mass spectroscopy of low and high mass scalar mesons and get
the result that the coupling strengths of the mixing between low and high mass
scalar mesons are very strong and the strengths of mixing for $I=1, 1/2$ scalar
mesons and those of I=0 scalar mesons are almost same. Next, we analyze the
decay widths and decay ratios of these mesons and get the results that the
coupling constants $A'$ for $I=1, 1/2$ which represents the coupling of high
mass scalar meson $N'$ -> two pseudoscalar mesons $PP$ are almost same as the
coupling $A'$ for the I=0. On the other hand, the coupling constant $A$ for
$I=1, I=1/2$ which represents the low mass scalar meson $N$ -> $PP$ are far
from the coupling constant $A$ for I=0. We consider a resolution for this
discrepancy. Coupling constant $A''$ for glueball $G$ -> $PP$ is smaller than
the coupling $A'$. $\theta_P$ is $40^\circ \sim 50^\circ$.


title: Neutrino Masses and Mixing Matrix from SU(1,1) Horizontal Symmetry

abstract:
  A new mechanism is proposed to explain neutrino masses and their mixing via
SU(1,1) horizontal symmetry breaking. Based on this mechanism smallness of
neutrino masses is naturally realized and inverted hierarchical spectrum with
large mixing is given.


title:
Growth of Inflaton Perturbations and the Post-Inflation Era in
  Supersymmetric Hybrid Inflation Models

abstract:
  It has been shown that hybrid inflation may end with the formation of
non-topological solitons of inflaton field. As a first step towards a fully
realistic picture of the post-inflation era and reheating in supersymmetric
hybrid inflation models, we study the classical scalar field equations of a
supersymmetric hybrid inflation model using a semi-analytical ansatz for the
spatial dependence of the fields. Using the minimal D-term inflation model as
an example, the inflaton field is evolved using the full 1-loop effective
potential from the slow-rolling era to the U(1)_{FI} symmetry-breaking phase
transition. Spatial perturbations of the inflaton corresponding to quantum
fluctuations are introduced for the case where there is spatially coherent
U(1)_{FI} symmetry breaking. The maximal growth of the dominant perturbation is
found to depend only on the ratio of superpotential coupling \lambda to the
gauge coupling g. The inflaton condensate fragments to non-topological solitons
for \lambda/g > 0.09. Possible consequences of non-topological soliton
formation in fully realistic SUSY hybrid inflation models are discussed.


title: Review of QCD spin physics

abstract:
  A short review is given of QCD spin physics and its major aims: obtaining the
polarized gluon density, the transversity distribution and understanding single
spin asymmetries. The importance of the Drell-Yan process, the role of
electron-positron colliders and the use of polarization to probe other, not
spin specific physics are emphasized.


title:
Suppression of baryon number violation in electroweak collisions:
  Numerical results

abstract:
  We present a semiclassical study of the suppression of topology changing,
baryon number violating transitions induced by particle collisions in the
electroweak theory. We find that below the sphaleron energy the suppression
exponent is remarkably close to the analytic estimates based on a low energy
expansion about the instanton. Above the sphaleron energy, the relevant
semiclassical solutions have qualitatively different properties from those
below the sphaleron: they correspond to jumps on top of the barrier. Yet these
processes remain exponentially suppressed, and, furthermore, the tunneling
exponent flattens out in energy. We also derive lower bounds on the tunneling
exponent which show that baryon number violation remains exponentially
suppressed up to very high energies of at least 30 sphaleron masses (250 TeV).


title: Color Superconducting Phases of Cold Dense Quark Matter

abstract:
  We investigate color superconducting phases of cold quark matter at densities
relevant for the interiors of compact stars. At these densities, electrically
neutral and weak-equilibrated quark matter can have unequal numbers of up,
down, and strange quarks. The QCD interaction favors Cooper pairs that are
antisymmetric in color and in flavor, and a crystalline color superconducting
phase can occur which accommodates pairing between flavors with unequal number
densities. In the crystalline color superconductor, quarks of different flavor
form Cooper pairs with nonzero total momentum, yielding a condensate that
varies in space like a sum of plane waves. Rotational and translational
symmetry are spontaneously broken. We use a Ginzburg-Landau method to evaluate
candidate crystal structures and predict that the favored structure is
face-centered-cubic. We predict a robust crystalline phase with gaps comparable
in magnitude to those of the color-flavor-locked phase that occurs when the
flavor number densities are equal. Crystalline color superconductivity will be
a generic feature of the QCD phase diagram, occurring wherever quark matter
that is not color-flavor locked is to be found. If a very large flavor
asymmetry forbids even the crystalline state, single-flavor pairing will occur;
we investigate this and other spin-one color superconductors in a survey of
generic color, flavor, and spin pairing channels. Our predictions for the
crystalline phase may be tested in an ultracold gas of fermionic atoms, where a
similar crystalline superfluid state can occur. If a layer of crystalline quark
matter occurs inside of a compact star, it could pin rotational vortices,
leading to observable pulsar glitches.


title: A Simple Model of two Little Higgses

abstract:
  We construct a little Higgs model using a simple global symmetry group SU(9)
spontaneously broken to SU(8). The electroweak interactions are extended to
SU(3)xU(1) and embedded in SU(9). At the electroweak scale, our model is a two
Higgs-doublet model. At the TeV scale, there are additional states, which are
responsible for the cancellation of one loop quadratic divergences. We compute
the effects of heavy states on the precision electroweak observables and find
that the lower bounds on the masses of heavy gauge bosons and fermions are
between 1 and 2 TeV.


title:
Further Evidence for Neutrino Flux Variability from Super-Kamiokande
  Data

abstract:
  While KamLAND apparently rules out Resonant-Spin-Flavor-Precession (RSFP) as
an explanation of the solar neutrino deficit, the solar neutrino fluxes in the
Cl and Ga experiments vary with solar rotation rates. Added to this evidence,
summarized here, a power spectrum analysis of the Super-Kamiokande data reveals
(99.9% CL) an oscillation in the band of twice the equatorial rotation
frequencies of the solar interior. An m=2 magnetic structure and RSFP, perhaps
as a subdominant process, would give this effect. Solar cycle data changes are
seen, as expected for convection zone modulations.


title: Beam-size effect in Bremsstrahlung

abstract:
  The smallness of the transverse dimensions of the colliding beams leads to
suppression of bremsstrahlung cross section. This beam-size effect was
discovered and investigated at INP, Novosibirsk. Different mechanisms of
radiation are discussed. Separation of coherent and incoherent radiation is
analyzed in detail. For linear collider this suppression affects the whole
radiation spectrum. It is shown that objections to the subtraction procedure in
\cite{BK2} are groundless.


title:
Classical Solutions of SU(2) and SU(3) Pure Yang-Mills Theories and
  Heavy Quark Spectrum

abstract:
  In this paper we compute classical Minkowsky spacetime solutions of pure
SU(2) and SU(3) gauge theories, in Landau gauge. The solutions are regular
everywhere except at the origin and/or infinity, are characterized by a four
momentum $k$ such that $k^2 = 0$ and resemble QED configurations. The classical
solutions suggest a particle-independent description of hadrons, similarly to
the Atomic and Nuclear energy levels, which is able to reproduce the heavy
quarkonium spectrum with a precision below 10%. Typical errors in the
theoretical mass prediction relative to the measured mass being of the order of
2-4%.


title: Flat Direction Dynamics in a Non-Topological Soliton-Dominated Universe

abstract:
  In hybrid inflation and running mass inflation models it is possible that the
inflaton field will fragment into non-topological solitons, resulting in a
highly inhomogeneous post-inflation era prior to reheating. In supersymmetric
models with a conventional homogeneous post-inflation era, the dynamics of flat
direction scalars are determined by cH^{2} corrections to the mass squared
terms, coming from the energy density of the Universe combined with
Planck-scale suppressed interactions. Here we reconsider the cH^{2} corrections
for a Universe dominated by inflatonic non-topological solitons. We show that
the dynamics in this case are typically equivalent to the case c = 0, even in
the vicinity of the non-topological solitons. Thus Affleck-Dine baryogenesis
will proceed as in the original c = 0 Affleck-Dine scenario.


title: Theoretical determination of etab's electromagnetic decay width

abstract:
  We discuss the theoretical predictions for the two photon decay width of the
pseudoscalar etab meson. Predictions from potential models are examined. It is
found that various models are in good agreement with each other. Results for
etab are also compared with those from Upsilon data through the NRQCD
procedure.


title: Maximal CP nonconservation in the Two-Higgs-Doublet Model

abstract:
  We study the simplest Two-Higgs-Doublet Model that allows for CP
nonconservation, where it can be parametrized by only one parameter in the
Higgs potential. Different concepts of maximal CP-nonconservation in the
gauge-Higgs and the quark-Higgs (Yukawa) sectors are compared. Maximal CP
nonconservation in the gauge-Higgs sector does normally not lead to maximal CP
nonconservation in the Yukawa sector, and vice versa.


title:
A non-standard CP transformation leading to maximal atmospheric neutrino
  mixing

abstract:
  We discuss a neutrino mass matrix $\mathcal{M}_\nu$ originally found by Babu,
Ma, and Valle (BMV) and show that this mass matrix can be characterized by a
simple algebraic relation. From this relation it follows that atmospheric
neutrino mixing is exactly maximal while at the same time an arbitrary mixing
angle $\theta_{13}$ of the lepton mixing matrix $U$ is allowed and--in the
usual phase convention--CP violation in mixing is maximal; moreover, neither
the neutrino mass spectrum nor the solar mixing angle are restricted. We put
forward a simple seesaw extension of the Standard Model where the family lepton
numbers are softly broken by the Majorana mass terms of the right-handed
neutrino singlets and the BMV mass matrix results from a non-standard $CP$
symmetry.


title: The Landau Distribution for Charged Particles Traversing Thin Films

abstract:
  The Landau distribution as well as its first and second momenta are well
suited for describing the energy loss of charged particles traversing a thin
layer of matter. At present, just rational approximations and asymptotic
expressions for these functions were obtained. In this paper we present a
direct calculation of the integral representation of these functions obtaining
perturbative and nonperturvative solutions expressed in terms of fast
convergent series. We also provide a simple numerical algorithm which allows to
control speed and precision of the results. The testing runs have provided, in
reasonable computing times, correct results up to 13-14 significant digits on
the density and distribution functions and 9-10 on the first and second
momenta. If necessary, this accuracy could be improved by adding more
coefficients to the algorithm.


title: Meson resonances, large N_c and chiral symmetry

abstract:
  We investigate the implications of large N_c and chiral symmetry for the mass
spectra of meson resonances. Unlike for most other mesons, the mass matrix of
the light scalars deviates strongly from its large-N_c limit. We discuss the
possible assignments for the lightest scalar nonet that survives in the
large-N_c limit.


title:
Can four neutrinos explain global oscillation data including LSND and
  cosmology?

abstract:
  We present an analysis of the global neutrino oscillation data in terms of
four-neutrino mass schemes. We find that the strong preference of oscillations
into active neutrinos implied by solar+KamLAND as well as atmospheric neutrino
data allows to rule out (2+2) mass schemes, whereas (3+1) schemes are strongly
disfavoured by short-baseline experiments. In addition, we perform an analysis
using recent data from cosmology, including CMB data from WMAP and data from
2dFGRS large scale structure surveys. These data lead to further restrictions
of the allowed regions for the (3+1) mass scheme.


title: Two-loop virtual QCD correction to the B -> X_s l+l- decay

abstract:
  I discuss an application of numerical techniques for massive two-loop Feynman
diagram evaluation to a phenomenologically very important rare decay process, B
-> X_s l+l-. This process, currently being measured at B factories, has been
calculated at two-loop level in the lower dilepton invariant mass perturbative
window by a previous collaboration. We extended this result, by using numerical
integration methods, to the whole observable spectrum of the dilepton invariant
mass consistent with the perturbative QCD regime.


title:
New heavy charged leptons at future high energy electron-positron
  colliders

abstract:
  New heavy charged lepton production and decay signatures at future
electron-positron colliders are investigated at $\sqrt {s}=500$ GeV. The
consequences of model dependence for vector singlets and vector doublets are
studied. Distributions are calculated including hadronization effects and
experimental cuts that suppress the standard model background. The final state
leptonic energy distributions are shown to give a very clear signature for
heavy charged leptons.


title: Theoretical Issues in $b$ Physics

abstract:
  Examples are given of some current questions in $b$ physics to which LHC
experiments may provide answers. These include (i) the precise determination of
parameters of the Cabibbo-Kobayashi-Maskawa (CKM) matrix; (ii) measurements of
CKM phases using B decays to CP eigenstates; (iii) the search for direct CP
asymmetries in B decays; (iv) rare radiative B decays; (v) the study of $B_s$
properties and decays, (vi) excited states of $B$ and $B_s$ mesons, and (vii)
the search for heavier quarks which could mix with the $b$ quark.


title: An assessment of J/Psi formation in the light of initial RHIC data

abstract:
  Predictions of J/Psi formation at RHIC via "off-diagonal" combinations of
charm and anticharm quarks in a region of color deconfinement are confronted
with initial data from the PHENIX collaboration. We find that the measured
centrality behavior places significant constraints on the various parameters
which control model calculations of J/Psi formation. Within present statistical
and systematic uncertainties, one can map out a region of parameter space
within which the contribution of formation in a deconfined phase is allowed. As
these uncertainties decrease and new data from d-Au interactions becomes
available, it is expected that definitive tests for the presence of this
formation mechanism will be possible. We anticipate that the rapidity and
transverse momentum spectra will prove decisive for a final determination.


title: Neutrino Decays and Neutrino Telescopes

abstract:
  It is shown how deviations of neutrino flavor mix from the canonical 1 : 1 :
1 in high energy astrophysical neutrinos can provide evidence for neutrino
decays with lifetimes as long as $10^4 s/eV$.


title: WKB Method and Relativistic Potential Models

abstract:
  Based on the Dirac approach we have developed the relativistic vision of the
WKB method for centrally symmetrical potential with mixed Lorenz structure. We
have obtained relativistic wavefunctions of light quark and the new rule of
quantization containing the spin-orbit interaction. These gives us the
possibility of finding the energy levels and decay width of hydrogen-like
quark-systems.


title: Inflation model with lower multipoles of the CMB suppressed

abstract:
  The recent observation of the cosmic microwave background anisotropy by the
WMAP confirmed that the lower multipoles are considerably suppressed. From the
standpoint of the cosmic variance, it is nothing but a statistical accident.
Alternatively, one can attribute the deficit of fluctuation on the large scale
to the cosmic history, which might be explained in the context of the
inflationary physics. In this paper, we show that it is possible to explain the
suppressed lower multipoles in the hybrid new inflation model.


title:
Semi-Phenomenological Approach to the Estimate of CP Effects in $K^{\pm}
  \to 3 \pi $ Decays

abstract:
  The amplitudes of the $K^{\pm} \to 3\pi$ and $K \to 2\pi$ decays are
expressed in terms of different combinations of one and the same set of
CP-conserving and CP-odd parameters. Extracting the magnitudes of these
parameters from the data on $K \to 2\pi$ dacays, we estimate an expected CP-odd
difference between the values of the slope parameters $g^+$ and $g^-$ of the
energy distributions of "odd" pions in $K^+ \to \pi^+\pi^+ \pi^-$ and $K^- \to
\pi^-\pi^-\pi^+$ decays.


title: MSSM Higgs bosons associated with high-pT jets at hadron colliders

abstract:
  The cross section for the production of the lightest neutral Higgs boson in
association with a high-pT hadronic jet, calculated in the framework of the
minimal supersymmetric standard model (MSSM), is presented. The expectations
for the hadronic cross section at the Large Hadron Collider are discussed using
reasonable kinematical cuts. In particular the contributions from superpartner
loops to the cross section and their dependence on the parameters of the MSSM
are investigated and found to be significant. Comparisons show that the
production rate for h0 + jet in the MSSM can differ widely from the
corresponding standard-model prediction.


title: Probing the seesaw mechanism with neutrino data and leptogenesis

abstract:
  In the framework of the seesaw mechanism with three heavy right-handed
Majorana neutrinos and no Higgs triplets we carry out a systematic study of the
structure of the right-handed neutrino sector. Using the current low-energy
neutrino data as an input and assuming hierarchical Dirac-type neutrino masses
$m_{Di}$, we calculate the masses $M_i$ and the mixing of the heavy neutrinos.
We confront the inferred properties of these neutrinos with the constraints
coming from the requirement of a successful baryogenesis via leptogenesis. In
the generic case the masses of the right-handed neutrinos are highly
hierarchical: $M_i \propto m_{Di}^2$; the lightest mass is $M_1 \approx 10^3 -
10^6$ GeV and the generated baryon-to-photon ratio $\eta_B\lesssim 10^{-14}$ is
much smaller than the observed value. We find the special cases which
correspond to the level crossing points, with maximal mixing between two
quasi-degenerate right-handed neutrinos. Two level crossing conditions are
obtained: ${m}_{ee}\approx 0$ (1-2 crossing) and $d_{12}\approx 0$ (2-3
crossing), where ${m}_{ee}$ and $d_{12}$ are respectively the 11-entry and the
12-subdeterminant of the light neutrino mass matrix in the basis where the
neutrino Yukawa couplings are diagonal. We show that sufficient lepton
asymmetry can be produced only in the 1-2 crossing where $M_1 \approx M_2
\approx 10^{8}$ GeV, $M_3 \approx 10^{14}$ GeV and $(M_2 - M_1)/ M_2 \lesssim
10^{-5}$.


title:
Probing the CP nature of the Higgs bosons by top-pair production at
  photon linear colliders

abstract:
  We study effects of heavy Higgs bosons on the top-pair production process at
photon linear colliders. The interference patterns between the resonant
Higgs-production amplitudes and the continuum QED amplitudes are examined. The
patterns tell us not only the CP nature of the Higgs bosons but also the phase
of the $\gamma\gamma$--Higgs vertex which gives new information about the Higgs
couplings to new charged particles. We point out that it is necessary to use
circularly polarized photon beams to produce efficiently heavy Higgs bosons
whose masses exceed the electron beam energy, and show that the above
interference patterns of the production amplitudes can be studied by observing
top decay angular distributions. Analytic expressions for the helicity
amplitudes for the sequential process $\gamma\gamma \to t \bar{t} \to (bW^+)
(\bar{b}W^-) \to (b f_1 \bar{f}_2) (\bar{b} f_3 \bar{f}_4)$ are presented in
terms of the generic $\gamma\gamma \to t \bar{t}$ production amplitudes.


title: Tau Polarization in Tau-Neutrino Nucleon Scattering

abstract:
  We investigate the spin polarization of \tau^{\pm} leptons produced in
\nu_{\tau} and \bar{\nu}_{\tau} nucleon scattering via charged currents.
Quasi-elastic scattering, \Delta resonance production and deep inelastic
scattering processes are studied. The polarization information is essential for
measuring the \tau^{\pm} appearance rate in long baseline neutrino oscillation
experiments, because the decay particle distributions depend crucially on the
\tau^{\pm} spin. In this article, we calculate the spin density matrix of each
process and estimate the spin polarization vector in medium and high neutrino
energy interactions. We find that the produced \tau^{\pm}'s have high degree of
polarization, and their spin direction depends non-trivially on the energy and
the scattering angle of \tau^{\pm} in the laboratory frame.


title:
Reach of the Fermilab Tevatron for minimal supergravity in the region of
  large scalar masses

abstract:
  The reach of the Fermilab Tevatron for supersymmetric matter has been
calculated in the framework of the minimal supergravity model in the clean
trilepton channel. Previous analyses of this channel were restricted to scalar
masses m_0<= 1 TeV. We extend the analysis to large values of scalar masses
m_0\sim 3.5 TeV. This includes the compelling hyperbolic branch/focus point
(HB/FP) region, where the superpotential \mu parameter becomes small. In this
region, assuming a 5\sigma (3\sigma) signal with 10 (25) fb^{-1} of integrated
luminosity, the Tevatron reach in the trilepton channel extends up to
m_{1/2}\sim 190 (270) GeV independent of \tan\beta . This corresponds to a
reach in terms of the gluino mass of m_{\tg}\sim 575 (750) GeV.


title:
Correlation Entropy of an Interacting Quantum Field and H-theorem for
  the O(N) Model

abstract:
  Following the paradigm of Boltzmann-BBGKY we propose a correlation entropy
(of the nth order) for an interacting quantum field, obtained by `slaving'
(truncation with causal factorization) of the higher (n+1 th) order correlation
functions in the Schwinger-Dyson system of equations. This renders an otherwise
closed system effectively open where dissipation arises. The concept of
correlation entropy is useful for addressing issues related to thermalization.
As a small yet important step in that direction we prove an H-theorem for the
correlation entropy of a quantum mechanical O(N) model with a Closed Time Path
Two Particle Irreducible Effective Action at the level of Next-to-Leading-Order
large N approximation. This model may be regarded as a field theory in $0$
space dimensions.


title: Chiral quark model and the nucleon spin

abstract:
  Using \chiQM with configuration mixing, the contribution of the gluon
polarization to the flavor singlet component of the total spin has been
calculated phenomenologically through the relation
\Delta\Sigma(Q^2)=\Delta\Sigma-\frac{3\alpha_s(Q^2)}{2\pi}\Delta g(Q^2) as
defined in the Adler-Bardeen scheme, where \Delta\Sigma on the right hand side
is Q^2 independent. For evaluation the contribution of gluon polarization
\Delta g'(=\frac{3\alpha_s(Q^2)}{2\pi}\Delta g(Q^2)), \Delta\Sigma is found in
the \chiQM by fixing the latest E866 data pertaining to \bar u-\bar d asymmetry
and the spin polarization functions whereas \Delta \Sigma(Q^2) is taken to be
0.30\pm0.06 and \alpha_s= 0.287\pm0.020, both at Q^2=5{\rm GeV}^2. The
contribution of gluon polarization \Delta g' comes out to be 0.33 which leads
to an almost perfect fit for spin distribution functions in the \chiQM. When
its implications for magnetic moments are investigated, we find perfect fit for
many of the magnetic moments. If an attempt is made to explain the angular
momentum sum rule for proton by using the above value of \Delta g', one finds
the contribution of gluon angular momentum to be as important as that of the q
\bar q pairs.


title: The sfermion mass spectrum of the MSSM at the one-loop level

abstract:
  The sfermion-mass spectrum of the minimal supersymmetric standard model is
investigated at the one-loop level. An on-shell scheme has been specified for
renormalization of the basic breaking parameters of the sfermionic sector.
Owing to SU(2)-invariance, the soft-breaking mass parameters of the left-chiral
scalar fermions of each isospin doublet are identical. Thus, one of the
sfermion-masses of each doublet can be expressed in terms of the other masses
and receives a mass shift at the one-loop level with respect to the
lowest-order value, which can be of $O(10$ GeV). Both strong and electroweak
contributions have been calculated for scalar quarks and leptons.