title:
Consistent Dyson summation of Higgs propagators in nonlinear
  parameterizations revisited

abstract:
  As we demonstrate in a process independent way, in a nonlinear
parameterization of the scalar sector of the standard model the Dyson summation
of the Higgs self energy can be performed without violating the Ward
Identities. This implies also the Goldstone boson equivalence theorem, in the
limited range of its validity in effective field theories. This proves an
earlier conjecture of Valencia and Willenbrock. Furthermore, the full Higgs
propagator is independent of the gauge parameters. These results are consistent
with the extension of the `gauge flip' formalism for the construction of gauge
invariant classes of Feynman diagrams to loop diagrams. In a nonlinear
parameterization of a 2-Higgs doublet model, the consistent Dyson summation is
possible for all neutral Higgs bosons, but not for the charged scalars.
Explicit examples of the equivalence theorem are discussed both in the minimal
standard model and a two-Higgs doublet model.


title:
Corrections to the Newtonian potential in the two-brane Randall-Sundrum
  model

abstract:
  We calculate the Newtonian potential in the two-brane Randall-Sundrum model,
emphasizing the effect of the finite distance between the two branes. The
result obtained is quite natural: When the distance in the potential is small
compared to the brane separation the two-brane model is indistinguishable from
the one-brane model, whereas when the distance is large the bulk dimension
behaves like an ordinary compact dimension, with an exponentially decreasing
correction to the four-dimensional potential. The contribution from the radion
is also included, and is found to give only a multiplicative factor of order 1
in the correction.


title: Recursive technique for evaluation of Feynman diagrams

abstract:
  A method is presented in which matrix elements for some processes are
calculated recursively. This recursive calculational technique is based on the
method of basis spinors.


title: Beta-Function in QCD and Gluon Condensate

abstract:
  Under assumption of singular behavior of alpha_s(q^2) at q^2 sim 0 and of
large q^2 behavior, corresponding to the perturbation theory up to four loops,
a procedure is considered of matching the beta-function at a boundary of
perturbative and non-perturbative regions. The contribution of the
non-perturbative region to the gluon condensate is calculated with varying
normalization condition alpha_s(m_tau^2) = 0.29, 0.30,..., 0.36 for two
different ways of definition of the non-perturbative invariant charge in the
infrared region. We obtain quite consistent results for values of the gluon
condensate, nonperturbative region scale q_0, and the string tension sigma.


title:
Interference of Higgs boson resonances in mu^+ mu^- -> neutralino_i
  neutralino_j with longitudinal beam polarization

abstract:
  We study the interference of resonant Higgs boson exchange in neutralino
production in \mu^+ \mu^- annihilation with longitudinally polarized beams. We
use the energy distribution of the decay lepton in the process \neutralino_j
\to \ell^\pm \slepton^\mp to determine the polarization of the neutralinos. In
the CP conserving Minimal Supersymmetric Standard Model a non-vanishing
asymmetry in the lepton energy spectrum is caused by the interference of Higgs
boson exchange channels with different CP eigenvalues. The contribution of this
interference is large if the heavy neutral bosons H and A are nearly
degenerate. We show that the asymmetry can be used to determine the couplings
of the neutral Higgs bosons to the neutralinos. In particular, the asymmetry
allows to determine the relative phase of the couplings. We find large
asymmetries and cross sections for a set of reference scenarios with nearly
degenerate neutral Higgs bosons.


title: Progress in FDC Project

abstract:
  The FDC is a general-purpose program package for Feynman Diagram Calculation.
We outline previous successes in calculations and focus on its recent progress
about automatic deduction the Feynman rules for first principle model,
especially for the supersymmetric model, proper evaluation of the rates of
multi-final-particle processes and the event generators in the SM and MSSM. A
few special applications are presented. The FDC-homepage shows an automatic
translation of the FDC results into the HTTP version.


title: Monte Carlo Exploration of Warped Higgsless Models

abstract:
  We have performed a detailed Monte Carlo exploration of the parameter space
for a warped Higgsless model of electroweak symmetry breaking in 5 dimensions.
This model is based on the $SU(2)_L\times SU(2)_R\times U(1)_{B-L}$ gauge group
in an AdS$_5$ bulk with arbitrary gauge kinetic terms on both the Planck and
TeV branes. Constraints arising from precision electroweak measurements and
collider data are found to be relatively easy to satisfy. We show, however,
that the additional requirement of perturbative unitarity up to the cut-off,
$\simeq 10$ TeV, in $W_L^+W_L^-$ elastic scattering in the absence of dangerous
tachyons eliminates all models. If successful models of this class exist, they
must be highly fine-tuned.


title:
Implication of the weak phase $\beta$ measured from $B \to \rho \gamma$
  decay

abstract: This paper has been withdrawn by the authors.


title:
Large electroweak penguins in B --> pi pi and B --> pi K : implication
  for new physics

abstract:
  We show that the anomalies in the $B\to\pi\pi$ decay channels, {\em viz.},
the large branching ratio of $B\to\pi^0\pi^0$ and large direct CP asymmetry of
$B\to\pi^+\pi^-$, can both be explained, even in the framework of existing
theoretical models which predict the relative strengths of the tree and the
strong penguin amplitudes, if there is an abnormally large electroweak penguin
contribution. We also critically examine the expectation of a similarly large
electroweak penguin in the $B\to\pi K$ sector, and show that it can be
accomodated, and may even be motivated from an SU(3) flavor symmetry between
the $B\to\pi\pi$ and the $B\to\pi K$ amplitudes, but is not necessary to
explain the data. We emphasize that if the experimental numbers on these
charmless nonleptonic channels survive, they may turn out to be an indirect
signal of new physics. Current data is insufficient to discriminate betwen
flavor-specific and flavor-blind new physics scenarios.


title:
A Comprehensive Four-Quark Interpretation of D_s(2317), D_s(2457) and
  D_s(2632)

abstract:
  The recently observed new member of the charm-strange family D_s(2632) which
has a surprisingly narrow width is challenging our theory. D_s(2317) and
D_s(2457) which were observed earlier have similar behaviors and receive
various theoretical explanations. Some authors use the heavy hadron chiral
effective theory to evaluate heavy-light quark systems and obtain a reasonable
evaluation on the masses of D_s(2317) and D_s(2457). An alternative picture is
to interpret them as four-quark or molecular states. In this work, we are
following the later and propose a unitive description for all the three new
members D_s(2632), D_s(2317) and D_s(2457) and at least, so far our picture is
consistent with the data.


title: New Ways to Soft Leptogenesis

abstract:
  Soft supersymmetry breaking terms involving heavy singlet sneutrinos provide
new sources of lepton number violation and of CP violation. In addition to the
CP violation in mixing, investigated previously, we find that `soft
leptogenesis' can be generated by CP violation in decay and in the interference
of mixing and decay. These additional ways to leptogenesis can be significant
for a singlet neutrino Majorana mass that is not much larger than the
supersymmetry breaking scale, $M < 100 m_{SUSY}$. In contrast to CP violation
in mixing, for some of these new contributions the sneutrino oscillation rate
can be much faster than the decay rate, so that the bilinear scalar term need
not be smaller than its natural scale.


title: Nonequilibrium dynamics in scalar hybrid models

abstract:
  We study by numerical simulations the transition from the metastable "false
vacuum" to the broken symmetry phase in the preheating stage after cosmic
inflation in a scalar hybrid model. We take quantum fluctuations and their back
reaction into account by applying a one-loop bubble-resummation.


title:
Electroweak corrections to Higgs production through ZZ fusion at the
  linear collider

abstract:
  We present the full order alpha electroweak radiative corrections to e+e- ->
e+e-H. The computation is performed with the help of GRACE-loop. The extraction
of the full QED corrections is performed, these are quite large at threshold.
The genuine weak corrections, for the linear collider energies, when expressed
in the G_mu scheme are of order -2 to -4 for Higgs masses preferred by the
latest precision data. We also extract the m_t^2 type corrections and make a
comparison with the weak corrections for the process e+e- ->nu nu H.


title: QCD corrections to vector boson fusion processes

abstract:
  NLO QCD corrections to H, W and Z production via vector boson fusion have
recently been calculated in the form of flexible parton level Monte Carlo
programs. This allows for the calculation of distributions and cross sections
with cuts at NLO accuracy. Some features of the calculation, as well as results
for the LHC, are reviewed.


title: SUSY Parameter Analysis at TeV and Planck Scales

abstract:
  Coherent analyses at future LHC and LC experiments can be used to explore the
breaking mechanism of supersymmetry and to reconstruct the fundamental theory
at high energies, in particular at the grand unification scale. This will be
exemplified for minimal supergravity.


title: Does the QCD Scale vary in time?

abstract:
  Last year I talked at this meeting about a possible time dependence of the
QCD coupling constant $\alpha_s$. This year I shall look into the problem once
more, without fully repeating the arguments given last year. Astrophysical
indications that the fine structure constant has undergone a small time
variation during the cosmological evolution are discussed within the framework
of the standard model of the electroweak and strong interactions and of grand
unification. A variation of the electromagnetic coupling constant could either
be generated by a corresponding time variation of the unified coupling constant
or by a time variation of the unification scale, or by both. The various
possibilities, differing substantially in their implications for the variation
of low energy physics parameters like the nuclear mass scale, are discussed.
The case in which the variation is caused by a time variation of the
unification scale is of special interest. It is supported in addition by recent
hints towards a time change of the proton-electron mass ratio.


title: The Physics of Flavor - Challenge for the Future

abstract:
  This is the summary talk for the theoretical part of ICFP03. The contents of
the talk are reviewed and a general outlook is given.


title: Flavour structure and proton decay in 6D orbifold GUTs

abstract:
  We study proton decay in a supersymmetric {\sf SO(10)} gauge theory in six
dimensions compactified on an orbifold. The dimension-5 proton decay operators
are forbidden by R-symmetry, whereas the dimension-6 operators are enhanced due
to the presence of KK towers. Three sequential quark-lepton families are
localised at the three orbifold fixed points, where {\sf SO(10)} is broken to
its three GUT subgroups. The physical quarks and leptons are mixtures of these
brane states and additional bulk zero modes. This leads to a characteristic
pattern of branching ratios in proton decay, in particular the suppression of
the $p\to \m^+K^0$ mode.


title: Towards precise predictions for the Higgsstrahlung at a linear collider

abstract:
  We report on progress in our work on obtaining high precision standard model
predictions for the Higgsstrahlung reaction at a linear collider.


title: Chargino Pair Production at Linear Collider and Split Supersymmetry

abstract:
  Recently N. Arkani-Hamed and S. Dimopoulos proposed a supersymmetric model
\cite{Arkani-Hamed:2004fb}, dubbed "Split Supersymmetry" in Ref.
\cite{Giudice:2004tc}, which can remove most of the unpleasant shortcomings of
TeV Supersymmetry. In this model all scalars except one finely tuned Higgs
boson are ultra heavy while the neutralino and chargino might remain light in
order to achieve gauge coupling unification and accord with the dark matter
density. In this paper, we investigated the impact of this new model on
chargino pair production at next generation linear colliders. Our numerical
results show that this process can be used to probe sneutrino mass up to 10
TeV. Therefore, precise measurements of chargino pair production at the linear
colliders could distinguish Split Supersymmetry from TeV Supersymmetry.


title: Two-body nonleptonic B decays in the Standard Model and beyond

abstract:
  We briefly discuss the phenomenology of B to pi pi, B to K pi and B to phi K
decays in the Standard Model and in Supersymmetry.


title: Grand Unification and Proton Stability Near the Peccei-Quinn Scale

abstract:
  We show that in an $SU(2)\otimes U(1)$ model with a DSF-like invisible axion
it is possible to obtain (i) the convergence of the three gauge coupling
constants at an energy scale near the Peccei-Quinn scale; (ii) the correct
value for $\sin^2\hat{\theta}_W(M_Z)$; (iii) the stabilization of the proton by
the cyclic $Z_{13}\otimes Z_3$ symmetries which also stabilize the axion as a
solution to the strong CP problem. Concerning the convergence of the three
coupling constants and the prediction of the weak mixing angle at the $Z$-peak,
this model is as good as the minimal supersymmetric standard model with
$\mu_{\rm SUSY}=M_Z$. We also consider the standard model with six and seven
Higgs doublets. The main calculations were done in the 1-loop approximation but
we briefly consider the 2-loop contributions.


title: Propagating leptons through matter with Muon Monte Carlo (MMC)

abstract:
  An accurate simulation of the propagation of muons through matter is needed
for the analysis of data produced by muon/neutrino underground experiments. A
muon may sustain hundreds of interactions before it is detected by the
experiment. Since a small systematic uncertainty repeated hundreds of times may
lead to sizable errors, requirements on the precision of the muon propagation
code are very stringent. A new tool for propagating muon and tau charged
leptons through matter that is believed to meet these requirements is presented
here. An overview of the program is given and some results of its application
are discussed.


title: Right-handed currents, CP Violation, and B->VV

abstract:
  Precision CP violation measurements in rare hadronic B decays could provide
clean signatures of parity symmetric new physics, implying the existence of
SU(2)_L x SU(2)_R x U(1)_{B-L} x P symmetry at high energies. New contributions
to the weak scale Hamiltonian which respect parity to O(1%) in supersymmetric
realizations are compatible with an SU(2)_R breaking scale M_R \le M_GUT,
implying that sensitivity to the GUT scale is possible. The generic case of
right-handed currents without left-right symmetry is also discussed. A detailed
analysis of B -> VV polarization in QCD factorization reveals that the low
longitudinal polarization fraction f_L (phi K*) \approx 50% can be accounted
for in the SM via a QCD penguin annihilation graph. The ratio of transverse
rates (Gamma_\perp /Gamma_\parallel) provides a sensitive test for new
right-handed currents. CP violation measurements in B -> VV decays can
discriminate between new contributions to the dipole and four quark operators.


title: Radiative tritium beta-decay and the neutrino mass

abstract:
  The shape of the electron energy spectrum in 3H beta-decay permits a direct
assay of the absolute scale of the neutrino mass; a highly accurate theoretical
description of the electron energy spectrum is necessary to the empirical task.
We update Sirlin's calculation of the outer radiative correction to nuclear
beta-decay to take into account the non-zero energy resolution of the electron
detector. In previous 3H beta-decay studies the outer radiative corrections
were neglected all together; only Coulomb corrections to the spectrum were
included. This neglect artificially pushes m_nu^2 < 0 in a potentially
significant way. We present a computation of the theoretical spectrum
appropriate to the extraction of the neutrino mass in the sub-eV regime.


title: Fluxes of Atmospheric Leptons at 600 GeV - 60 TeV

abstract:
  The atmospheric muon flux is generated with CORSIKA 6.030 (using QGSJET
high-energy interaction model) and fitted with the formula from Gaisser (1990).
Spectra and mass distribution of primaries were taken according to the
poli-gonato model of Horandel (2003). A convenient parameterization of the
cos(th)->cos(th*) correction, originally tabulated in Volkova (1969), is
presented. This correction, together with muon energy losses and decay, is
shown to significantly improve the fit to the simulated data.


title:
Multi-leg calculations with the GRACE/1-LOOP system. --Toward Radiative
  Corrections to e+e- -> mu nu-bar u d-bar --

abstract:
  We performed the calculation of the full O(alpha) corrections to e+e- -> mu-
nu-bar u d-bar with the help of the GRACE/1-LOOP system. We discuss how a
finite decay width introduces a serious gauge invariance breaking, particularly
for infrared 5-point functions. This is related to the way the reduction of
those functions is performed and to the treatment of the width in the
reduction.


title: Associated Higgs production with bottom quarks at hadron colliders

abstract:
  Higgs-boson production in association with bottom quarks is an important
discovery channel for supersymmetric Higgs particles at the Tevatron and the
LHC. We present higher-order QCD predictions for inclusive cross sections and
for the production of a Higgs boson in association with high-p_T bottom quarks.
We compare calculations performed in a four-flavour scheme based on the parton
processes gg,qqbar -> b bbar H with five-flavour scheme calculations based on
bottom-quark scattering.


title: Holes in the ghost condensate

abstract:
  In a recently proposed model of ``ghost condensation'', spatially homogeneous
states may mix, via tunneling, with inhomogeneous states which are somewhat
similar to bubbles in the theory of false vacuum decay, the corresponding
bubble nucleation rate being exponentially sensitive to the ultraviolet
completion of the model. The conservation of energy and charge requires that
the energy density is negative and the field is strongly unstable in a part of
the nucleated bubble. Unlike in the theory of false vacuum decay, this region
does not expand during subsequent real-time evolution. In the outer part,
positive energy outgoing waves develop, which eventually form shocks. Behind
the outgoing waves and away from the bubble center, the background settles down
to its original value. The outcome of the entire process is thus a microscopic
region of negative energy and strong field -- ``hole in the ghost condensate''
-- plus a collection of outgoing waves (particles of the ghost condensate
field) carrying away finite energy.


title: The static force in background perturbation theory

abstract:
  The static force $F_B(r)$ and the strong coupling $\alpha_F(r)$, which
defines the gluon-exchange part of $F_B(r)$, are studied in QCD background
perturbation theory (BPT). In the region $r\la 0.6 $ fm $\alpha_F(r)$ turns out
to be essentially smaller than the coupling $\alpha_B(r)$ in the static
potential. For the dimensionless function $\Phi_B(r) = r^2 F_B(r)$ the
characteristic values $\Phi_B(r_1) =1.0$ and $\Phi_B(r_0)=1.65$ are shown to be
reached at the following $Q\bar Q$ separations: $r_1\sqrt{\sigma} =0.77,
r_0\sqrt{\sigma} =1.09$ in quenched approximation and $r_1\sqrt{\sigma}=0.72,
r_0\sqrt{\sigma}=1.04$ for $n_f =3$. The numbers obtained appear to be by only
8% smaller than those calculated in lattice QCD while the values of the
couplings $\alpha_F(r_1)$ and $\alpha_F(r_0)$ in BPT are by $\sim 30% (n_f =3)$
and $50% (n_f=0)$ larger than corresponding lattice couplings. With the use of
the BPT potential good description of the bottomonium spectrum is obtained.


title:
Parity, Charge Conjugation and SU(3) Constraints on Threshold
  Enhancement in $J/\psi$ decays into $\gamma p\bar p$ and $K p \bar\Lambda$

abstract:
  We study the threshold enhancement effects of baryon-anti-baryon systems in
$J/\psi$ decays at BES using parity $P$, charge conjugation $C$, and flavor
SU(3) symmetries. The $P$ and $C$ symmetries restrict the $p\bar p$ in $J/\psi
\to \gamma p\bar p$ to be in a state with $C=+1$, while the $p\bar p$ in
$J/\psi \to \pi^0 p\bar p$ to be with $C=-1$. Combining the $C$ and $P$
symmetries with flavor SU(3) symmetry, i.e. the CPS symmetry, we find that the
$\Lambda \bar p$ system cannot be in $0^+$ and $0^-$ states in $J/\psi \to K^+
\Lambda \bar p$. We provide a consistent explanation of observation and
non-observation of near threshold enhancements in $J/\psi \to K^+ \Lambda \bar
p$ and $J/\psi \to \pi^0 p \bar p$, respectively. We also find that near baryon
pair threshold enhancement can happen in several channels for $J/\psi$ decays
and can be several times larger than that observed in $J/\psi \to K^+ \Lambda
\bar p$ in some channels.


title:
On the loop-loop scattering amplitudes in Abelian and non-Abelian gauge
  theories

abstract:
  The high-energy scattering amplitude of two colour-singlet quark-antiquark
pairs is governed by the correlation function of two Wilson loops, which follow
the classical straight lines for quark (antiquark) trajectories. This quantity
is expected to be free of IR divergences, differently from what happens for the
parton-parton scattering amplitude, described, in the high-energy limit, by the
expectation value of two Wilson lines. We shall explicitly test this IR
finitness by a direct non-perturbative computation of the loop-loop scattering
amplitudes in the (pedagogic, but surely physically interesting) case of
quenched QED. The results obtained for the Abelian case will be generalized to
the case of a non-Abelian gauge theory with N_c colours, but stopping to the
fourth order in perturbation theory. In connection with the above-mentioned IR
finitness, we shall also discuss some analytic properties of the loop-loop
scattering amplitudes in both Abelian and non-Abelian gauge theories, when
going from Minkowskian to Euclidean theory, which can be relevant to the still
unsolved problem of the s-dependence of hadron-hadron total cross-sections.


title: How to Study Quark Spin without Spin

abstract:
  I review the most important single- and double-spin asymmetries that allow
for the extraction of transversity and other chiral-odd and/or T-odd parton
densities, necessary to explore the partonic content and the spin structure of
the nucleon. With particular reference to the proposed GSI-HESR facility, I
report on some Monte-Carlo simulations of cross sections and spin asymmetries
for (un)polarized Drell-Yan with protons and antiprotons at the proposed
kinematics for this future facility.


title:
Charm mass dependence of the weak Hamiltonian in chiral perturbation
  theory

abstract:
  Suppose that the weak interaction Hamiltonian of four-flavour SU(4) chiral
effective theory is known, for a small charm quark mass m_c. We study how the
weak Hamiltonian changes as the charm quark mass increases, by integrating it
out within chiral perturbation theory to obtain a three-flavour SU(3) chiral
theory. We find that the ratio of the SU(3) low-energy constants which mediate
Delta I=1/2 and Delta I=3/2 transitions, increases rather rapidly with m_c, as
\sim m_c ln (1/m_c). The logarithmic effect originates from "penguin-type"
charm loops, and could represent one of the reasons for the Delta I=1/2 rule.


title: Atmospheric Neutrino Constraints on Lorentz Violation

abstract:
  Sensitive tests of Lorentz invariance can emerge from the study of neutrino
oscillations, particularly for atmospheric neutrinos where the effect is
conveniently near-maximal and has been observed over a wide range of energies.
We assume these oscillations to be described in terms of two neutrinos with
different masses and (possibly) different maximal attainable velocities (MAVs).
It suffices to examine limiting cases in which neutrino velocity eigenstates
coincide with either their mass or flavor eigenstates. We display the modified
mu to tau neutrino transition probability for each case. Data on atmospheric
neutrino oscillations at the highest observed energies and pathlengths can
yield constraints on neutrino MAV differences (i.e., tests of special
relativity) more restrictive than any that have been obtained to date on
analogous Lorentz-violating parameters in other sectors of particle physics.


title: Is the D_sJ(2632) Meson a Cryptoexotic Tetraquark Baryonium State?

abstract:
  We suggest that the recently discovered charm-strange meson D_sJ(2632), with
unusual properties, could be a cyptoexotic tetraquark baryonium state
cdd_bars_bar. We predict other four narrow states, as Regge recurrences of
D_sJ(2632), below the possible baryon-antibaryon thresholds.


title: Non-Singlet QCD Analysis of the Structure Function F_2 in 3-Loops

abstract:
  First results of a non--singlet QCD analysis of the structure function
$F_2(x,Q^2)$ in 3--loop order based on the non--singlet world data are
presented. Correlated errors are determined and their propagation through the
evolution equations is performed analytically. The value for $\alpha_s(M_Z)$ is
determined to be $0.1135 +/- 0.0023/0.0026$ compatible with results from other
QCD analyses. Low moments for $u_v(x)$, $d_v(x)$ and $u_v(x) - d_v(x)$ with
correlated errors are calculated which may be compared with results from
lattice simulations.


title: Single Field Baryogenesis

abstract:
  We propose a new variant of the Affleck-Dine baryogenesis mechanism in which
a rolling scalar field couples directly to left- and right-handed neutrinos,
generating a Dirac mass term through neutrino Yukawa interactions. In this
setup, there are no explicitly CP violating couplings in the Lagrangian. The
rolling scalar field is also taken to be uncharged under the $B - L$ quantum
numbers. During the phase of rolling, scalar field decays generate a
non-vanishing number density of left-handed neutrinos, which then induce a net
baryon number density via electroweak sphaleron transitions.


title:
A note on possible interpretations for the $D_{SJ}^+(2632)$ observed by
  SELEX

abstract:
  We suggest some possible interpretations for the $D_{SJ}^+(2632)$ observed by
SELEX. The $D_{SJ}^+(2632)$ could be the first radial excitation of the $1^-$
ground state $\rm{D_s}^*$(2112), and its unusual decay patten might be
hopefully explained by the node structure of the wave functions. In addition,
the $D_{SJ}^+(2632)$ could also be a $c\bar sg$ hybrid state or a
$(cs)_{3^*}-(\bar s\bar s)_{3}$ (diquark-antidiquark) bound state.


title: Relic density of dark matter in brane world cosmology

abstract:
  We investigate the thermal relic density of the cold dark matter in the
context of the brane world cosmology. Since the expansion law in a high energy
regime is modified from the one in the standard cosmology, if the dark matter
decouples in such a high energy regime its relic number density is affected by
this modified expansion law. We derive analytic formulas for the number density
of the dark matter. It is found that the resultant relic density is
characterized by the ``transition temperature'' at which the modified expansion
law in the brane world cosmology is connecting with the standard one, and can
be considerably enhanced compared to that in the standard cosmology, if the
transition temperature is low enough.


title:
Possible Hadronic Molecule Lambda(1405) and Thermal Glueballs in SU(3)
  Lattice QCD

abstract:
  We aim to construct quark hadron physics based on QCD. First, using lattice
QCD, we study mass spectra of positive-parity and negative-parity baryons in
the octet, the decuplet and the singlet representations of the SU(3) flavor. In
particular, we consider the lightest negative-parity baryon, the
$\Lambda$(1405), which can be an exotic hadron as the $N \bar K$ molecular
state or the flavor-singlet three-quark state. We investigate the
negative-parity flavor-singlet three-quark state in lattice QCD using the
quenched approximation, where the dynamical quark-anitiquark pair creation is
absent and no mixing occurs between the three-quark and the five-quark states.
Our lattice QCD analysis suggests that the flavor-singlet three-quark state is
so heavy that the $\Lambda$(1405) cannot be identified as the three-quark
state, which supports the possibility of the molecular-state picture of the
$\Lambda$(1405). Second, we study thermal properties of the scalar glueball in
an anisotropic lattice QCD, and find about 300 MeV mass reduction near the QCD
critical temperature from the pole-mass analysis. Finally, we study the
three-quark potential, which is responsible to the baryon properties. The
detailed lattice QCD analysis for the 3Q potential indicates the Y-type
flux-tube formation linking the three quarks.


title: Two-loop Splitting Amplitudes

abstract:
  Splitting amplitudes govern the behavior of scattering amplitudes at the
momenta of external legs become collinear. In this talk we outline the
calculation of two-loop splitting amplitudes via the unitarity sewing method.
This method retains the simple factorization properties of light-cone gauge,
but avoids the need for prescriptions such as the principal value or
Mandelstam-Leibbrandt ones. The encountered loop momentum integrals are then
evaluated using integration-by-parts and Lorentz invariance identities. We
outline a variety of applications for these splitting amplitudes.


title: One-loop calculations for SUSY processes

abstract:
  Strategy and results for complete one-loop computations in the Minimal
Supersymmetric Standard Model are reviewed, with applications to the
calculation of SUSY mass spectra and SUSY-particle processes. Determination of
renormalization constants and counterterms are described in the on-shell
renormalization scheme, and a translation between $\bar{\rm DR}$ and on-shell
parameters is given. As an example, cross sections for chargino and neutralino
pair production in $e^+e^-$ annihilation are presented, complete at the
one-loop level.


title:
Anharmonic O(N) oscillator model in next-to-leading order of the 1/N
  expansion

abstract:
  An extended Holstein-Primakoff mapping which incorporates both single- and
double boson mappings is used in the context of O(N+1) anharmonic oscillator
with the global symmetry broken down to O(N) to study the next-to-leading order
of the 1/N expansion. It is shown that the Goldstone theorem is obeyed to that
order and that the Ward identity is satisfied.


title: Electroweak Model and Constraints on New Physics

abstract: Section 10 of the 2004 edition of the Review of Particle Physics.


title:
Global QCD fit from $Q^2=0$ to $Q^2=30000$ GeV$^2$ with Regge-compatible
  initial condition

abstract:
  In this paper I show that it is possible to use Regge theory to constrain the
initial parton distribution functions of a global DGLAP fit. In this approach,
both quarks and gluons have the same high-energy behaviour which may also be
used to describe soft interactions. More precisely, I show that, if we
parametrise the parton distributions with a triple-pole pomeron, {\em i.e.}
like $\log^2(1/x)$ at small $x$, at $Q^2=Q_0^2$ and evolve these distribution
with the DGLAP equation, we can reproduce $F_2^p$, $F_2^d$, $F_2^n/F_2^p$,
$F_2^{\nu N}$ and $xF_3^{\nu N}$ for $W^2\ge 12.5$ GeV$^2$. In this case, we
obtain a new leading-order global QCD fit with a Regge-compatible initial
condition.
  I shall also show that it is possible to use Regge theory to extend the
parton distribution functions to small $Q^2$. This leads to a description of
the structure functions over the whole $Q^2$ range based on Regge theory at low
$Q^2$ and on QCD at large $Q^2$.
  Finally, I shall argue that, at large $Q^2$, the parton distribution
functions obtained from DGLAP evolution and containing an essential singularity
at $j=1$ can be approximated by a triple-pole pomeron behaviour.


title: Elementary Particle Interactions In A Background Magnetic Field

abstract:
  The thesis deals with the effect of magnetic fields on elementary particle
interactions, of which the neutrino is of prime concern. The initial part
focuses on the quantum field theoretical description of scattering processes
which involves charged particles, in presence of a background uniform magnetic
field. A brief discussion on the charged particle propagators in an uniform
background magnetic field using Schwinger's method is presented. A general
analysis on neutrino self-energy in a background magnetic field (and in a
magnetized medium) alongwith its effect on neutrino oscillation phenomenology,
follows. The final part of the thesis deals with the topic of neutrino photon
interactions in a background magnetic field and finds an expression of the
effective electric charge of neutrinos in a magnetized medium.


title:
Accessing Sivers gluon distribution via transverse single spin
  asymmetries in p(transv. polarized) p --> D X processes at RHIC

abstract:
  The production of D mesons in the scattering of transversely polarized
protons off unpolarized protons at RHIC offers a clear opportunity to gain
information on the Sivers gluon distribution function. D production at
intermediate rapidity values is dominated by the elementary g g --> c cbar
channel; contributions from q qbar --> c cbar s-channel become important only
at very large values of x_F. In both processes there is no single spin
transfer, so that the final c or cbar quarks are not polarized. Therefore, any
transverse single spin asymmetry observed for D's produced in p(transv.
polarized) p interactions cannot originate from the Collins fragmentation
mechanism, but only from the Sivers effect in the distribution functions. In
particular, any sizeable spin asymmetry measured in p(transv. polarized) p -->
D X at mid-rapidity values will be a direct indication of a non zero Sivers
gluon distribution function. We study the p(transv. polarized) p --> D X
process including intrinsic transverse motion in the parton distribution and
fragmentation functions and in the elementary dynamics, and show how results
from RHIC could allow a measurement of the Sivers gluon distribution function.


title: Perfect Fluid Theory and its Extensions

abstract:
  We review the canonical theory for perfect fluids, in Eulerian and Lagrangian
formulations. The theory is related to a description of extended structures in
higher dimensions. Internal symmetry and supersymmetry degrees of freedom are
incorporated. Additional miscellaneous subjects that are covered include
physical topics concerning quantization, as well as mathematical issues of
volume preserving diffeomorphisms and representations of Chern-Simons terms (=
vortex or magnetic helicity).

categories: hep-ph hep-th math-ph math.MP physics.class-ph


title: The Fundamental-Weak Scale Hierarchy in the Standard Model

abstract:
  The multiple point principle, according to which several vacuum states with
the same energy density exist, is put forward as a fine-tuning mechanism
predicting the ratio between the fundamental and electroweak scales in the
Standard Model (SM). It is shown that this ratio is exponentially huge: $\sim
e^{40}$. Using renormalisation group equations for the SM, we obtain the
effective potential in the 2-loop approximation and investigate the existence
of its postulated second minimum at the fundamental scale. The investigation of
the evolution of the top quark Yukawa coupling constant in the 2-loop
approximation shows that, with initial values of the top Yukawa coupling in the
interval $h(M_t)=0.95\pm 0.03$ (here $M_t$ is the top quark pole mass), a
second minimum of the SM effective potential can exist in the region
$\phi_{min2}\approx 10^{16}-10^{22}$ GeV. A prediction is made of the existence
of a new bound state of 6 top quarks and 6 anti-top quarks, formed due to Higgs
boson exchanges between pairs of quarks/anti-quarks. This bound state is
supposed to condense in a new phase of the SM vacuum. This gives rise to the
possibility of having a phase transition between vacua with and without such a
condensate. The existence of three vacuum states (new, electroweak and
fundamental) solves the hierarchy problem in the SM.


title: Equation of State of Gluon Plasma from Fundamental Modular Region

abstract:
  Numerical studies of the bulk properties of the quark-gluon plasma reveal a
pronounced drop in pressure $p$ compared to energy density $\e$ as the
deconfining temperature is approached from above. We show by general
thermodynamic reasoning that this can be explained only by a term $LT$ in the
trace anomaly $\th(T) = \e - 3p$ that is linear in the temperature $T$. Such a
term appears in the equation of state of the gluon plasma, which we calculate,
described as a gas of quasi-particle gluons with dispersion relation $E(k) =
\sqrt{k^2 + {M^4 \over k^2}}$, that follows from the restriction of the
configuration space to the fundamental modular region.


title: Dynamical Chiral Symmetry Breaking in Unquenched ${QED}_3$

abstract:
  We investigate dynamical chiral symmetry breaking in unquenched ${QED}_3$
using the coupled set of Dyson--Schwinger equations for the fermion and photon
propagators. For the fermion-photon interaction we employ an ansatz which
satisfies its Ward--Green--Takahashi identity. We present self-consistent
analytical solutions in the infrared as well as numerical results for all
momenta. In Landau gauge, we find a phase transition at a critical number of
flavours of $N_f^{\mathrm crit} \approx 4$. In the chirally symmetric phase the
infrared behaviour of the propagators is described by power laws with
interrelated exponents. For $N_f=1$ and $N_f=2$ we find small values for the
chiral condensate in accordance with bounds from recent lattice calculations.
We investigate the Dyson--Schwinger equations in other linear covariant gauges
as well. A comparison of their solutions to the accordingly transformed Landau
gauge solutions shows that the quenched solutions are approximately gauge
covariant, but reveals a significant amount of violation of gauge covariance
for the unquenched solutions.


title: Supersymmetric hybrid inflation in the braneworld scenario

abstract:
  In this paper we reconsider the supersymmetric hybrid inflation in the
context of the braneworld scenario . The observational bounds are satisfied
with an inflationary energy scale $\mu\simeq 4\times 10^{-4}M_p$, without any
fine-tuning of the coupling parameter, provided that the five-dimensional
Planck scale is $M_5\stackrel{<}{\sim} 2\times 10^{-3}M_p$ . We have also
obtained an upper bound on the the brane tension .


title:
Neutrino Oscillations and Collider Test of the R-parity Violating
  Minimal Supergravity Model

abstract:
  We study the R-parity violating minimal supergravity models accounting for
the observed neutrino masses and mixing, which can be tested in future collider
experiments. The bi-large mixing can be explained by allowing five dominant
tri-linear couplings $ \lambda'_{1,2,3}$ and $\lambda_{1,2}$. The desired ratio
of the atmospheric and solar neutrino mass-squared differences can be obtained
in a very limited parameter space where the tree-level contribution is tuned to
be suppressed. In this allowed region, we quantify the correlation between the
three neutrino mixing angles and the tri-linear R-parity violating couplings.
Qualitatively, the relations $| \lambda'_1 | < | \lambda'_2| \sim |
\lambda'_3|$, and $|\lambda_1| \sim |\lambda_2|$ are required by the large
atmospheric neutrino mixing angle $\theta_{23}$ and the small angle
$\theta_{13}$, and the large solar neutrino mixing angle $\theta_{12}$,
respectively. Such a prediction on the couplings can be tested in the next
linear colliders by observing the branching ratios of the lightest
supersymmetric particle (LSP). For the stau or the neutralino LSP, the ratio
$|\lambda_1|^2: |\lambda_2|^2: |\lambda_1|^2 + |\lambda_2|^2$ can be measured
by establishing $Br(e\nu): Br(\mu\nu) : Br(\tau\nu)$ or $Br(\nu e^\pm \tau^\mp
): Br(\nu\mu^\pm\tau^\mp) : Br(\nu\tau^\pm\tau^\mp)$, respectively. The
information on the couplings $\lambda'_i$ can be drawn by measuring $Br(l_i t
\bar{b}) \propto |\lambda'_i|^2$ if the neutralino LSP is heavier than the top
quark.


title: On the determination of the parity of the $\Theta^+$

abstract:
  We critically examine the possibility of determining the parity of the
$\Theta^+(1540)$ from the reactions $NN\to \Theta^+Y$ ($Y$ = $\Lambda$,
$\Sigma$) recently discussed in the literature. Specifically, we study the
energy dependence of those observables that were suggested to be the most
promising ones to unravel the parity of the $\Theta^+$, namely the spin
correlation coefficient $A_{xx}$, and the spin transfer coefficient $D_{xx}$.
We show that the energy dependence of $\sigma_0(1+A_{xx})$, corresponding to
the spin-triplet production cross section, guarantees unambiguous information
on the parity of the $\Theta^+$. Here, $\sigma_0$ denotes the unpolarized cross
section. Also, the possibility to determine the parity of the $\Theta^+$
through the energy dependence of $\sigma_0D_{xx}$ is discussed.


title: Higgs-boson coupling to charginos in the MSSM at linear colliders

abstract:
  We discuss the associated production of a light Higgs boson and a light
chargino pair in the process e+e- -> h chi+ chi- in the Minimal
  Supersymmetric Standard Model (MSSM) at linear colliders (LC) with
  \sqrt s=500 GeV. This process gives direct informations about the Higgs-boson
coupling to light charginos, that cannot be analyzed in decay processes due to
phase-space restrictions. We compute total cross sections in the regions of the
MSSM parameter space where the process cannot proceed via on-shell production
and subsequent decay of either heavier charginos or pseudoscalar Higgs bosons
A. Cross sections up to a few 0.1 fb are allowed, making this process
potentially detectable at high-luminosity linear colliders. We also compute
analytically the final h momentum distributions in the limit of very heavy
electron-sneutrino masses.


title:
Medium-modified fragmentation of b-jets tagged by a leading muon in
  ultrarelativistic heavy ion collisions

abstract:
  The possibility to observe the medium-modified fragmentation of hard b-quarks
tagged by a leading muon in ultrarelativistic heavy ion collisions is analyzed.
We have found that reasonable statistics, ~20000 events per 1 month of LHC run
with lead beams, can be expected for the realistic geometrical acceptance and
kinematic cuts. The numerical estimates on the effect of the medium-induced
softening b-jet fragmentation function are given.


title:
Langevin Dynamics of Chiral Phase Transition at Finite Temperature and
  Density

abstract:
  We derive the linear Langevin equation to describe the dynamics of the chiral
phase transition above the critical temperature by applying the projection
operator method to the Nambu-Jona-Lasinio model at finite temperature and
density. The relaxation time of the critical fluctuations increases as the
temperature approaches toward the critical temperature because of the critical
slowing down. The critical slowing down is enhanced in low temperature and
large chemical potential region and around the tricritical point.


title: Modern Cosmology

abstract:
  I review in these lectures our present understanding of the origin and
evolution of the universe, making emphasis on the most recent observations of
the acceleration of the universe, the precise measurements of the microwave
background anisotropies, and the formation of structure like galaxies and
clusters of galaxies from tiny primodial fluctuations generated during
inflation.


title: Lepton mixing angle $\theta_{13} = 0$ with a horizontal symmetry $D_4$

abstract:
  We discuss a model for the lepton sector based on the seesaw mechanism and on
a $D_4$ family symmetry. The model predicts the mixing angle $\theta_{13}$ to
vanish. The solar mixing angle $\theta_{12}$ is free--it will in general be
large if one does not invoke finetuning. The model has an enlarged scalar
sector with three Higgs doublets, together with two real scalar gauge singlets
$\chi_i$ ($ i = 1, 2$) which have vacuum expectation values < \chi_i >_0$ at
the seesaw scale. The atmospheric mixing angle $\theta_{23}$ is given by $\tan
\theta_{23} = <\chi_2>_0$ /<\chi_1>_0$, and it is maximal if the Lagrangian is
$D_4$-invariant; but $D_4$ may be broken softly, by a term of dimension two in
the scalar potential, and then < \chi_2_0$ becomes different from < \chi_1_0$.
Thus, the strength of the soft $D_4$ breaking controls the deviation of
$\theta_{23}$ from $\pi / 4$. The model predicts a normal neutrino mass
spectrum ($m_3 > m_2 > m_1$) and allows successful leptogenesis if $m_1 \sim 4
\times 10^{-3} \mathrm{eV}$; these properties of the model are independent of
the presence and strength of the soft $D_4$ breaking.


title:
Vector Anomaly Revisited in the Anomalous Magnetic Moment of $W^\pm$
  Bosons

abstract:
  In the calculation of the anomalous magnetic moment of $W^\pm$ bosons, we
discuss vector anomalies occuring in the fermion loop that spoil the predictive
power of the theory. While the previous analyses were limited to using
essentially the manifestly covariant dimensional regularization method, we
extend the analysis using both the manifestly covariant formulation and the
light-front hamiltonian formulation with several different regularization
methods. In the light-front dynamics (LFD), we find that the zero-mode
contribution to the helicity zero-to-zero amplitude for the $W^\pm$ gauge
bosons is crucial for the correct calculations. Further, we confirm that the
anomaly-free condition found in the analysis of the axial anomaly can also get
rid of the vector anomaly in LFD as well as in the manifestly covariant
calculations. Our findings in this work may provide a bottom-up fitness test
not only to the LFD calculations but also to the theory itself, whether it is
any extension of the Standard Model or an effective field theoretic model for
composite systems.


title: Glueball-glueball scattering in a constituent gluon model

abstract:
  In this work we use a mapping technique to derive in the context of a
constituent gluon model an effective Hamiltonian that involves explicit gluon
degrees of freedom. We study glueballs with two gluons using the Fock-Tani
formalism. In the present work we consider two possibilities for $0^{++}$: (i)
as a pure $s\bar{s}$ and calculate, in the context of a quark interchange
picture, the cross-section; (ii) as a glueball where a new calculation for this
cross-section is made, in the context of the constituent gluon model, with
gluon interchange.


title: Saturation and Traveling waves

abstract:
  High parton density effects with energy obey non-linear QCD evolution
equations for which exact solutions are not known. The mathematical class to
which the non-linear Balitsky-Kovchegov equation belongs is identified, proving
the existence of asymptotic in energy traveling wave solutions which are
``universal'' i.e. independent of the initial conditions and of the precise
form of the non-linearities. This has an direct impact on geometrical scaling
and the diffusive transition to saturation, which is shown to be ``normal'' for
constant QCD coupling and ``abnormal'' for running coupling.


title: Higgsless GUT Breaking and Trinification

abstract:
  Boundary conditions on an extra-dimensional interval can be chosen to break
bulk gauge symmetries and to reduce the rank of the gauge group. We consider
this mechanism in models with gauge trinification. We determine the boundary
conditions necessary to break the trinified gauge group directly down to that
of the standard model. Working in an effective theory for the gauge
symmetry-breaking parameters on a boundary, we examine the limit in which the
GUT-breaking sector is Higgsless and show how one may obtain the low-energy
particle content of the minimal supersymmetric standard model. We find that
gauge unification is preserved in this scenario, and that the differential
gauge coupling running is logarithmic above the scale of compactification. We
compare the phenomenology of our model to that of four-dimensional trinified
theories.


title: Statistical hadronization and hadronic microcanonical ensemble II

abstract:
  We present a Monte-Carlo calculation of the microcanonical ensemble of the of
the ideal hadron-resonance gas including all known states up to a mass of about
1.8 GeV and full quantum statistics. The microcanonical average multiplicities
of the various hadron species are found to converge to the canonical ones for
moderately low values of the total energy, around 8 GeV, thus bearing out
previous analyses of hadronic multiplicities in the canonical ensemble. The
main numerical computing method is an importance sampling Monte-Carlo algorithm
using the product of Poisson distributions to generate multi-hadronic channels.
It is shown that the use of this multi-Poisson distribution allows an efficient
and fast computation of averages, which can be further improved in the limit of
very large clusters. We have also studied the fitness of a previously proposed
computing method, based on the Metropolis Monte-Carlo algorithm, for event
generation in the statistical hadronization model. We find that the use of the
multi-Poisson distribution as proposal matrix dramatically improves the
computation performance. However, due to the correlation of subsequent samples,
this method proves to be generally less robust and effective than the
importance sampling method.


title: Exact renormalization group and many-fermion systems

abstract:
  The exact renormalization group methods is applied to many fermion systems
with short-range attractive force. The strength of the attractive
fermion-fermion interaction is determined from the vacuum scattering length. A
set of approximate flow equations is derived including fermionic and bosonic
fluctuations. The numerical solutions show a phase transition to a gapped
phase. The inclusion of bosonic fluctuations is found to be significant only in
the small-gap regime.


title:
Renormalizing the Schwinger-Dyson equations in the auxiliary field
  formulation of $\lambda \phi^4$ field theory

abstract:
  In this paper we study the renormalization of the Schwinger-Dyson equations
that arise in the auxiliary field formulation of the O(N) $\phi^4$ field
theory. The auxiliary field formulation allows a simple interpretation of the
large-N expansion as a loop expansion of the generating functional in the
auxiliary field $\chi$, once the effective action is obtained by integrating
over the $\phi$ fields. Our all orders result is then used to obtain finite
renormalized Schwinger-Dyson equations based on truncation expansions which
utilize the two-particle irreducible (2-PI) generating function formalism. We
first do an all orders renormalization of the two- and three-point function
equations in the vacuum sector. This result is then used to obtain explicitly
finite and renormalization constant independent self-consistent S-D equations
valid to order~1/N, in both 2+1 and 3+1 dimensions. We compare the results for
the real and imaginary parts of the renormalized Green's functions with the
related \emph{sunset} approximation to the 2-PI equations discussed by Van Hees
and Knoll, and comment on the importance of the Landau pole effect.


title: Options for the SELEX state D$_{s\J}^+(2632)$

abstract:
  We consider possible assignments for the D$_{s\J}^+(2632)$, which was
recently reported in D$_s^+\eta$ and D$^0$K$^+$ final states by the SELEX
Collaboration at Fermilab. The most plausible quark model assignment for this
state is the first radial excitation ($2^3\S_1$) of the $c\bar s$
D$_s^*(2112)$, although the predicted mass and strong decay branching fractions
for this assignment are not in agreement with the SELEX data. The reported
dominance of D$_s\eta$ over DK appears especially problematic. An intriguing
similarity to the K$^*(1414)$ is noted. $2^3\S_1$--$^3\D_1$ configuration
mixing is also considered, and we find that this effect is unlikely to resolve
the branching fraction discrepancy. Other interpretations as a $c\bar s$-hybrid
or a two-meson molecule are also considered, but appear unlikely. Thus, if this
state is confirmed, it will require reconsideration of the systematics of
charmed meson spectroscopy and strong decays.


title: Construction of the Dual Ginzburg-Landau Theory from the Lattice QCD

abstract:
  We briefly review the QCD physics and then introduce recent topics on the
confinement physics. In the maximally abelian (MA) gauge, the low-energy QCD is
abelianized owing to the effective off-diagonal gluon mass $M_{\rm off} \simeq
1.2 {\rm GeV}$ induced by the MA gauge fixing. We demonstrate the construction
of the dual Ginzburg-Landau (DGL) theory from the low-energy QCD in the MA
gauge in terms of the lattice QCD evidences on infrared abelian dominance and
infrared monopole condensation.


title: Hard exclusive processes and higher-order QCD corrections

abstract:
  The short review of the higher order corrections to the hard exclusive
processes is given. Different approaches are discussed and the importance of
higher-order calculations is stressed.


title: Hadron Physics and Confinement Physics in Lattice QCD

abstract:
  We are aiming to construct Quark Hadron Physics and Confinement Physics based
on QCD. Using SU(3)$_c$ lattice QCD, we are investigating the three-quark
potential at T=0 and $T \ne 0$, mass spectra of positive and negative-parity
baryons in the octet and the decuplet representations of the SU(3) flavor,
glueball properties at T=0 and $T \ne 0$. We study also Confinement Physics
using lattice QCD. In the maximally abelian (MA) gauge, the off-diagonal gluon
amplitude is strongly suppressed, and then the off-diagonal gluon phase shows
strong randomness, which leads to a large effective off-diagonal gluon mass,
$M_{\rm off} \simeq 1.2 {\rm GeV}$. Due to the large off-diagonal gluon mass in
the MA gauge, infrared QCD is abelianized like nonabelian Higgs theories. In
the MA gauge, there appears a macroscopic network of the monopole world-line
covering the whole system. From the monopole current, we extract the dual gluon
field $B_\mu$, and examine the longitudinal magnetic screening. We obtain $m_B
\simeq$ 0.5 GeV in the infrared region, which indicates the dual Higgs
mechanism by monopole condensation. From infrared abelian dominance and
infrared monopole condensation, low-energy QCD in the MA gauge is described
with the dual Ginzburg-Landau (DGL) theory.


title: The Lost Tribes of Charmonium

abstract:
  To illustrate the campaign to extend our knowledge of the charmonium
spectrum, I focus on a puzzling new state, $X(3872) \to \pi^+\pi^- J/\psi$.
Studying the influence of open-charm channels on charmonium properties leads us
to propose a new charmonium spectroscopy: additional discrete charmonium levels
that can be discovered as narrow resonances of charmed and anticharmed mesons.
I call attention to open issues for theory and experiment.


title: A Remark on Neutrino Oscillations Observed in Kamland Experiment

abstract:
  It is demonstrated that the observation of neutrino oscillations in the
atmospheric (K2K) neutrino experiments and unitarity of the mixing matrix
implies that disappearance of the reactor $\bar\nu_{e}$'s discovered in the
KamLAND experiment is due to $\bar\nu_{e}\to \bar\nu_{\mu}$ {\em and}
$\bar\nu_{e}\to \bar\nu_{\tau}$ transitions. At $\theta_{23}=\pi/4$ the
probabilities of these transitions are equal.


title:
Enhancement of CP Violating terms for Neutrino Oscillation in Earth
  Matter

abstract:
  We investigate the $\nu_e \to \nu_{\mu}$ oscillation in the framework of
three generations when neutrinos pass through the earth. The oscillation
probability is represented by the form, $P(\nu_e \to \nu_\mu)=A\cos
\delta+B\sin \delta+C$ in arbitrary matter profile by using the leptonic CP
phase $\delta$. We compare our approximate formula in the previous paper with
the formula which includes second order terms of $\alpha=\Delta m_{21}^2/\Delta
m_{31}^2$ and $s_{13}=\sin \theta_{13}$. Non-perturbative effects of $\alpha$
and $s_{13}$ can be taken into account in our formula and the precision of the
formula is rather improved around the MSW resonance region. Furthermore, we
compare the earth matter effect of $A$ and $B$ with that of $C$ studied by
other authors. We show that the magnitude of $A$ and $B$ can reach a few ten %
of $C$ around the main three peaks of $C$ in the region $E>1$ GeV by numerical
calculation. We give the qualitative understanding of this result by using our
approximate formula. The mantle-core effect, which is different from the usual
MSW effect, appears not only in $C$ but also in $A$ and $B$, although the
effect is weakened.


title: Effective Lagrangian approach to Higgs-mediated FCNC top quark decays

abstract:
  The flavor changing neutral current (FCNC) transitions t --> q'H and t -->
q'V_i (V_i=\gamma, g, Z) are studied in the context of the effective Lagrangian
approach. We focus on the scenario in which these decays are predominantly
induced by new physics effects arising from the Yukawa sector extended with
dimension-six SU_L(2) X U_Y(1)-invariant operators, which generate the most
general CP-even and CP-odd tq'H vertex at the tree level. For the unknown
coefficients, we assume a slightly modified version of the Cheng-Sher ansatz.
We found that the branching ratio for the Higgs-mediated FCNC t--> q'V_i decays
are enhanced by two or three orders of magnitude with respect to the results
expected in models with extended Higgs sectors, such as the general two-Higgs
doublet model. We discuss the possibilities of detecting this class of decays
at the LHC.


title: High Q**2 Structure Functions and Parton Distributions

abstract:
  This contribution reviews the main achievements in inclusive measurements
made by the H1 and ZEUS collaborations during the first phase of HERA data
taking. The QCD analysis of these data by both collaborations are described.
The case for a common QCD analysis is briefly discussed, with an emphasis on
the possible $W$ mass extraction.


title:
On the Efficiency of Topological Defect Formation in the Systems of
  Various Size and (Quasi-) Dimensionality

abstract:
  The experiments on verification of the Kibble-Zurek mechanism showed that
topological defects are formed most efficiently in the systems of small size or
low (quasi-)dimensionality, whereas in the macroscopic two- and
three-dimensional samples a concentration of the defects, as a rule, is
strongly suppressed. A reason for universality of such behavior can be revealed
by considering a strongly-nonequilibrium symmetry-breaking phase transition in
the simplest phi-4 field model. It is shown that the resulting distribution of
the defects (domain walls) is formally reduced to the well-known Ising model,
whose behavior changes dramatically in passing from a finite to infinite size
of the system and from the low (D=1) to higher (D>=2) dimensionality.


title: Flavor Changing Supersymmetry Interactions in a Supernova

abstract:
  We consider for the first time R-parity violating interactions of the Minimal
Standard Supersymmetric Model involving neutrinos and quarks (``flavor changing
neutral currents'', FCNC's) in the infall stage of stellar collapse. Our
considerations extend to other kinds of flavor changing neutrino reactions as
well. We examine non-forward neutrino scattering processes on heavy nuclei and
free nucleons in the supernova core. This investigation has led to four
principal original discoveries/products: (1) first calculation of neutrino
flavor changing cross sections for spin one half (e.g. free nucleon) and spin
zero nuclear targets; (2) discovery of nuclear mass number squared (A squared)
coherent amplification of neutrino-quark FCNC's; (3) analysis of FCNC-induced
alteration of electron capture and weak/nuclear equilibrium in the collapsing
core; and (4) generalization of the calculated cross sections (mentioned in 1)
for the case of hot heavy nuclei to be used in collapse/supernova and neutrino
transport simulations. The scattering processes that we consider allow electron
neutrinos to change flavor during core collapse, thereby opening holes in the
electron neutrino sea, which allows electron capture to proceed and results in
a lower core electron fraction. A lower electron fraction implies a lower
homologous core mass, a lower shock energy, and a greater nuclear
photo-disintegration burden for the shock. In addition, unlike the standard
supernova model, the core now could have net muon and/or tau lepton numbers.
These effects could be significant even for supersymmetric couplings below
current experimental bounds.


title: Extensive Renyi Statistics from Non-Extensive Entropy

abstract:
  We show that starting with either the non-extensive Tsallis entropy in Wang's
formalism or the extensive Renyi entropy, it is possible to construct the
equilibrium statistical mechanics with non-Gibbs canonical distribution
functions. The transformation formulas between Tsallis statistics and Renyi
statistics are presented. The one-particle distribution function in Renyi
statistics with extensive entropy for the classical ideal gas at finite
particle number develops a power-law tail for high momenta.


title: Searches for sterile neutrinos (and other light particles)

abstract:
  Future neutrino and cosmological experiments will perform powerful searches
for new light particles. After a general introduction we discuss how a new
light fermion (`sterile neutrino') could manifest.


title: Light Mesons on the Light Front

abstract:
  We study the properties of light mesons in the scalar, pseudo-scalar, and
vector channels within the light-front quantization, by using the (one flavor)
Nambu--Jona-Lasinio model with vector interaction. After taking into account
the effects of chiral symmetry breaking, we derive the bound-state equation in
each channel in the large N limit (N is the number of colors), which means that
we consider the lowest q\bar{q} Fock state with the constituent quark and
antiquark. By solving the bound-state equation, we simultaneously obtain a mass
and a light-cone (LC) wavefunction of the meson. While we reproduce the
previous results for the scalar and pseudo-scalar mesons, we find that, for a
vector meson, the bound-state equations for the transverse and longitudinal
polarizations look different from each other. However, eventually after
imposing a cutoff which is invariant under the parity and boost
transformations, one finds these two are identical, giving the same mass and
the same (spin-independent) LC wavefunction. When the vector interaction
becomes larger than a critical value, the vector state forms a bound state,
whose mass decreases as the interaction becomes stronger. While the LC
wavefunction of the pseudo-scalar meson is broadly distributed in longitudinal
momentum (x) space, that of the vector meson is squeezed around x=1/2.


title: Exclusive Electroproduction of Pentaquarks

abstract:
  Exclusive electroproduction of a K or K^* meson on the nucleon can give a
Theta^+ pentaquark in the final state. This reaction offers an opportunity to
investigate the structure of pentaquark baryons at parton level. We discuss the
generalized parton distributions for the N -> Theta^+ transition and give the
leading order amplitude for electroproduction in the Bjorken regime.


title: Towards the understanding of the meson spectra

abstract:
  We present a quark-quark interaction for the complete study of the meson
spectra, from the light to the heavy sector. We compare the quark model
predictions against well-established $q\bar q$ experimental data. This allows
to identify discrepancies between quark model results and experiment that may
signal physics beyond conventional hadron spectroscopy.


title: Describing non-$q\bar q$ candidates

abstract:
  Despite the apparent simplicity of meson spectroscopy there are some states
which cannot be accommodated in the usual $q\bar q$ structure. Among them there
are either exotic states as the X(1600) or the recently measured charm states
$D_{sJ}^*$ and X(3872) and some of the light scalar mesons. In this work we
present a possible description of these states in terms of tetraquarks.


title: Excited Charmed Mesons: Observations, Analyses and Puzzles

abstract:
  We review the status of recently observed positive parity charmed resonances,
both in the non-strange and in the strange sector. We describe the experimental
findings, the main theoretical analyses and the open problems deserving further
investigations.


title:
A precise analytical description of the Earth matter effect on
  oscillations of low energy neutrinos

abstract:
  We present a formalism for the matter effects in the Earth on low energy
neutrino fluxes which is both accurate and has all advantages of a full
analytic treatment. The oscillation probabilities are calculated up to second
order term in $\epsilon(x) \equiv 2V(x)E/\Delta m^2$ where $V(x)$ is the
neutrino potential at position $x$. We show the absence of large undamped
phases which makes the expansion in $\epsilon$ well behaved. An improved
expansion is presented in terms of the variation of $V(x)$ around a suitable
mean value which allows to treat energies up to those relevant for Supernova
neutrinos. We discuss also the case of three-neutrino mixing.


title: Possible Gauge Theoretic Origin for Quark-Lepton Complementarity

abstract:
  Similarity between the weak interaction properties of quarks and leptons has
led to suggestions that the origin of lepton mixing angles may be related to
those of quarks. In this paper, we present a gauge model based on $SU(2)_L
\times SU(2)_R\times SU(4)_c$ group that leads to a new form for the quark
lepton complementarity which predicts the solar neutrino mixing angle in terms
of the Cabibbo angle for the case of inverted mass hierarchy for neutrinos. We
also indicate how these ideas can be implemented in an $E_6$ inspired
trinification $SU(3)_C \times SU(3)_L \times SU(3)_R$ model, which is more
closely allied to string theory by the AdS/CFT correspondence.


title:
Neutral currents and tests of three-neutrino unitarity in long-baseline
  experiments

abstract:
  We examine a strategy for using neutral current measurements in long-baseline
neutrino oscillation experiments to put limits on the existence of more than
three light, active neutrinos. We determine the relative contributions of
statistics, cross section uncertainties, event misidentification and other
systematic errors to the overall uncertainty of these measurements. As specific
case studies, we make simulations of beams and detectors that are like the K2K,
T2K, and MINOS experiments. We find that the neutral current cross section
uncertainty and contamination of the neutral current signal by charge current
events allow a sensitivity for determining the presence of sterile neutinos at
the 0.10--0.15 level in probablility.


title: Concerning the Landau Pole in 3-3-1 Models

abstract:
  Some 3-3-1 models predict the existence of a non-perturbative regime at the
TeV scale. We study in these models, and their supersymmetric extensions, the
energy at which the non-perturbative limit and a Landau-like pole arise. An
order of magnitude for the mass of the extra neutral vector boson, $Z^\prime$,
present in these models is also obtained.


title: String Approach to QCD Quarks in Fundamental Representations

abstract:
  Straightforward use of AdS/CFT correspondence can give QCD with quarks in
adjoint representations. Using an asymmetric orbifold approach we obtain
nonsupersymmetric QCD with four quark flavors in fundamental representations of
color.


title: The Simplest Little Higgs

abstract:
  We show that the SU(3) little Higgs model has a region of parameter space in
which electroweak symmetry breaking is natural and in which corrections to
precision electroweak observables are sufficiently small. The model is anomaly
free, generates a Higgs mass near 150 GeV, and predicts new gauge bosons and
fermions at 1 TeV.


title:
Is it possible to construct the Proton Structure Function by
  Lorentz-boosting the Static Quark-model Wave Function?

abstract:
  The energy-momentum relations for massive and massless particles are E =
p^2/2m and E = pc respectively. According to Einstein, these two different
expressions come from the same formula E = \sqrt{(cp)^2 + m^2 c^4}. Quarks and
partons are believed to be the same particles, but they have quite different
properties. Are they two different manifestations of the same covariant entity
as in the case of Einstein's energy-momentum relation? The answer to this
question is YES. It is possible to construct harmonic oscillator wave functions
which can be Lorentz-boosted. They describe quarks bound together inside
hadrons. When they are boosted to an infinite-momentum frame, these wave
functions exhibit all the peculiar properties of Feynman's parton picture. This
formalism leads to a parton distribution corresponding to the valence quarks,
with a good agreement with the experimentally observed distribution.


title:
Indirect search for lepton flavour violation at CERN LEP via doubly
  charged bileptons

abstract:
  We search for lepton flavour violating couplings via doubly charged bilepton
(or doubly charged Higgs) exchange in electron-positron annihilation process $
\text{e}^{+}\text{e}^{-}\to \mu^{+}\mu^{-}, \tau^{+}\tau^{-}$ using CERN LEP
data at the center of mass energies between 189-207 GeV. Standard model program
ZFITTER has been used to calculate radiative corrections. We find that
$g_{L}^{2}/M_{L}^{2}<O(10^{-6})GeV^{-2}$ at 95% C.L. for flavour violating
scalar and vector bilepton couplings.


title: Instanton-driven Gluon Saturation

abstract:
  We report on the interesting possibility of instanton-driven gluon saturation
in lepton-nucleon scattering at small Bjorken-x. The explicitly known instanton
gauge field serves as a concrete realization of an underlying non-perturbative
saturation mechanism associated with strong classical fields. The conspicuous,
intrinsic instanton size scale known from lattice simulations, turns out to
determine the saturation scale. The ``colour glass condensate'' can be
identified in our approach with the QCD-sphaleron state, dominating
instanton-induced processes in the softer regime.


title:
A probability measure in the space of spectral functions and structure
  functions

abstract:
  We present a novel technique to parametrize experimental data, based on the
construction of a probability measure in the space of functions, which retains
the full experimental information on errors and correlations. This measure is
constructed in a two step process: first, a Monte Carlo sample of replicas of
the experimental data is generated, and then an ensemble of neural network is
trained over them. This parametrization does not introduce any bias due to the
choice of a fixed functional form. Two applications of this technique are
presented. First a probability measure in the space of the spectral function
$\rho_{V-A}(s)$ is generated, which incorporates theoretical constraints as
chiral sum rules, and is used to evaluate the vacuum condensates. Then we
construct a probability measure in the space of the proton structure function
$F_2^p(x,Q^2)$, which updates previous work, incorporating HERA data.


title:
Background for Terrestrial Antineutrino Investigations: Scientific Basis
  of Knowledge on the Composition of the Deep Interior of the Earth

abstract:
  I present from a historical perspective a logical progression of
understanding, related to the composition of the deep interior of the Earth,
that comes from fundamental discoveries and from discoveries of fundamental
quantitative relationships in nature. By following step by step the reasoning
from that understanding, one might begin to appreciate what is not yet known
that pertains to recent interest in geo-antineutrinos and also what should be
investigated to further advance that understanding.


title: Automated calculations for massive fermion production with aITALC

abstract:
  The package aITALC has been developed for the automated calculation of
radiative corrections to two-fermion production at $e^+ e^-$ colliders. The
package uses Diana, Qgraf, Form, Fortran, FF, LoopTools, and further unix/linux
tools. Numerical results are presented for $e^+e^- \to e^+e^-, mu^+mu^-, b
\bar{s}, t \bar{c}$.


title: Weak Corrections to Hadronic Observables

abstract:
  We illustrate one-loop weak corrections to three-jet production in $e^+e^-$
at $\sqrt{s}=M_Z$, to the production of a $Z$ or $\gamma$ in association with a
hard jet at hadron colliders and to the production cross section of two
$b$-jets at Tevatron and Large Hadron Collider (LHC).


title: Fermion masses and proton decay in string-inspired SU(4)*SU(2)^2*U(1)_X

abstract:
  We present a supersymmetric model of fermion masses with SU(4)*SU(2)^2*U(1)_X
gauge group with matter in fundamental and antisymmetric tensor representations
only. The up, down, charged lepton and neutrino Yukawa matrices are
distinguished by different Clebsch-Gordan coefficients due to contracting over
SU(4) and SU(2)_R indices. We obtain a hierarchical light neutrino mass
spectrum with bi-large mixing. The condition that anomalies be cancelled by a
Green-Schwarz mechanism leads to fractional U(1)_X charges which exclude $B$
violation through dimension-4 and -5 operators.


title:
The 2PI finite temperature effective potential of the O(N) linear sigma
  model in 1+1 dimensions, at next-to-leading order in 1/N

abstract:
  We study the O(N) linear sigma model in 1+1 dimensions. We use the 2PI
formalism of Cornwall, Jackiw and Tomboulis in order to evaluate the effective
potential at finite temperature. At next-to-leading order in a 1/N expansion
one has to include the sums over "necklace" and generalized "sunset" diagrams.
  We find that - in contrast to the Hartree approximation - there is no
spontaneous symmetry breaking in this approximation, as to be expected for the
exact theory. The effective potential becomes convex throughout for all
parameter sets which include N=4,10,100, couplings lambda=0.1 and 0.5, and
temperatures between 0.2 and 1. The Green's functions obtained by solving the
Schwinger-Dyson equations are enhanced in the infrared region. We also compare
the effective potential as function of the external field phi with those
obtained in various other approximations.


title: Progress in the small x resummation of the singlet anomalous dimension

abstract:
  We summarize our recent results on the small x resummation of the singlet
anomalous dimension. We recall the main features of our approach, and briefly
describe some work in progress on the inclusion of subleading corrections to
it.


title:
A General Analysis of Corrections to the Standard See-saw Formula in
  Grand Unified Models

abstract:
  In realistic grand unified models there are typically extra vectorlike matter
multiplets at the GUT scale that are needed to explain the family hierarchy.
These contain neutrinos that, when integrated out, can modify the usual
neutrino see-saw formula. A general analysis is given. It is noted that such
modifications can explain why the neutrinos do not exhibit a strong family
hierarchy like the other types of fermions.


title: Normal vs. Inverted Hierarchy in Type I Seesaw Models

abstract:
  We demonstrate that, for every grand unified model based on a conventional
type I seesaw mechanism leading to a normal light neutrino mass hierarchy, one
can easily generate a corresponding model with an inverted hierarchy which
yields the same neutrino oscillation parameters. However, the latter type model
has several unattractive instabilities which will disfavor any grand unified
type I seesaw model, if an inverted neutrino mass hierarchy is observed
experimentally. This should be contrasted with the softly-broken $L_e - L_\mu -
L_\tau$ flavor symmetry models which are eliminated, if the data favors a
normal mass hierarchy.


title:
Solar Neutrino Background in Neutrinoless double beta-decay searching
  for experiments

abstract:
  Background of germanium and xenon detectors due to the elastic scattering of
$^{8}B$ solar neutrinos on electrons have been calculated. The background is
4.6 \times $10^{-4}$ counts/(keV$\cdot t\cdot$y) that defines the sensitivity
of double beta-decay experiments at a level $T^{0\nu\beta\beta}_{1/2} \approx
4\times$10^{27}$ {yr} and it corresponds to effective majorana mass $ \mid <
m_{\nu_e}>\mid \approx 23.5$ meV. This limit after a half of one year of
measurements for 10 tons natural Xe detector will be obtained.


title: $D_{sJ}^+(2632)$: An Excellent Candidate of Tetraquarks

abstract:
  We analyze various possible interpretations of the narrow state
$D_{sJ}(2632)$ which lies 100 MeV above threshold. This interesting state
decays mainly into $D_s \eta$ instead of $D^0 K^+$. If this relative branching
ratio is further confirmed by other experimental groups, we point out that the
identification of $D_{sJ}(2632)$ either as a $c\bar s$ state or more generally
as a ${\bf {\bar 3}}$ state in the $SU(3)_F$ representation is probably
problematic. Instead, such an anomalous decay pattern strongly indicates
$D_{sJ}(2632)$ is a four quark state in the $SU(3)_F$ ${\bf 15}$ representation
with the quark content ${1\over 2\sqrt{2}}
(ds\bar{d}+sd\bar{d}+su\bar{u}+us\bar{u}-2ss\bar{s})\bar{c}$. We discuss its
partners in the same multiplet, and the similar four-quark states composed of a
bottom quark $B_{sJ}^0(5832)$. Experimental searches of other members
especially those exotic ones are strongly called for.


title:
Gamma-ray detection from neutralino annihilation in non--universal SUGRA
  scenarios

abstract:
  We analyze the indirect detection of neutralino dark matter in supergravity
scenarios with non-universal soft scalar and gaugino masses. In particular, the
gamma-ray flux arising from the galactic center due to neutralino annihilation
is computed. In important regions of the parameter space it can be increased
significantly (about two orders of magnitude) with respect to the universal
scenario. This result is compared with the sensitivity of current and planned
experiments, such as the satellite-based detectors EGRET and GLAST and the
ground-based atmospheric telescope HESS. For example, for $\tan\beta< 35$ the
sensitivity region of GLAST and HESS can only be reached in non-universal
scenarios.


title:
Model Independent Determination of the Top Yukawa Coupling from LHC and
  LC

abstract:
  We show how a measurement of the process pp-->t tbar H + X at the LHC and a
measurement of the Higgs boson branching ratios BR(H-->b bar) and BR(H-->W+W-)
at a future linear electron positron collider can be combined to extract a
model-independent measurement of the top quark Yukawa coupling. We find that
for 120 GeV < m_H < 200 GeV a measurement precision of 15% including systematic
uncertainties can be achieved for integrated luminosities of 300 fb-1 at the
LHC and 500 fb-1 at the LC at a centre-of-mass energy of 350 GeV.


title:
Prospects for Observing an Invisibly Decaying Higgs Boson in $t\bar{t}H$
  Production at the LHC

abstract:
  In this thesis we study the prospects for observing the invisibly decaying
Higgs boson in the associated $t\bar tH$ production at the LHC. The results of
the Monte Carlo simulations of signal and background processes show that there
is a possibility of observing the statistically significant number of signal
events required for the discovery. Moreover, the analysis can be further
improved to reduce the number of false reconstructions of the $W$ boson.
  The analysis of the $t \bar t H$ production is independent of the model in
which the Higgs boson decays into the invisible channel. There are several
possibilities for models where $H\to invisible$ can be of interest. For this
thesis, we have studied the simplest supersymmetric model, called mSUGRA. The
results of the scans of the mSUGRA model parameter space show that the regions,
where the branching ratio of the lightest neutral Higgs boson to the lightest
neutralino pair is high, are excluded by current experimental constraints. The
$h \to b \bar b$ channel dominates, and the possibility for discovery in this c
hannel will not be suppressed by the invisible decays. This result does not
disqualify invisible channel as possible signature in other models.
  Chapter 4 of this thesis is based on the published paper: B.P. Kersevan,
\underline{M. Malawski}, E. Richter-Was: {\em Prospects for observing an
invisibly decaying Higgs boson in the $t\bar t H$ production at the LHC}, The
European Physical Journal C - Particles and Fields, 2003, vol. 29, no. 4, pp.
541 - 548.


title: Effective CP violation in the Standard Model

abstract:
  We study the strength of effective CP violation originating from the CKM
matrix in the effective action obtained by integrating out the fermions in the
Standard Model. Using results obtained by Salcedo for the effective action in a
general chiral gauge model, we find that there are no CKM CP-violating terms to
fourth order in a gauge-covariant derivative expansion that is non-perturbative
in the Higgs field. The details of the calculation suggest that, at zero
temperature, the strength of CP violation is approximately independent of the
overall scale of the Yukawa couplings. Thus, order of magnitude estimates based
on Jarlskog's invariant could be too small by a factor of about 10^{17}.


title:
Master integrals for the two-loop light fermion contributions to $gg \to
  H$ and $H \to \gamma\gamma$

abstract:
  We give the analytic expressions of the eight master integrals entering our
previous computation of two-loop light fermion contributions to $gg \to H$ and
$H \to \gamma\gamma$. The results are expressed in terms of generalized
harmonic polylogarithms with maximum weight four included.


title: Quark-gluon vertex model and lattice-QCD data

abstract:
  A model for the dressed quark-gluon vertex, at zero gluon momentum, is formed
from a nonperturbative extension of the two Feynman diagrams that contribute at
1-loop in perturbation theory. The required input is an existing ladder-rainbow
model Bethe-Salpeter kernel from an approach based on the Dyson-Schwinger
equations; no new parameters are introduced. The model includes an Ansatz for
the triple-gluon vertex. Two of the three vertex amplitudes from the model
provide a point-wise description of the recent quenched lattice-QCD data. An
estimate of the effects of quenching is made.


title:
Why the HBT data are not in agreement with a single chemical and kinetic
  freeze-out

abstract:
  Based on simple scale arguments we argue that any thermalized fireball
evolution scenario which is in agreement with the observed Hanbury-Brown Twiss
(HBT) correlation radii at RHIC and reproduces the measured total multiplicity
cannot reflect the distribution of matter at or close to a phase transition
temperature of ~170 MeV and any scenario which assumes that HBT reflects these
properties cannot be reached by a sensible choice of evolution parameters while
agreeing with all correlation radii. We investigate this question in more
detail using a parametrized version of the fireball evolution which has been
shown to reproduce particle spectra and HBT for a separate chemical and kinetic
freeze-out.


title:
Reconciling Neutralino Relic Density with Yukawa Unified Supersymmetric
  Models

abstract:
  Supersymmetric grand unified models based on the gauge group SO(10) are
especially attractive in light of recent data on neutrino masses. The simplest
SO(10) SUSY GUT models predict unification of third generation Yukawa couplings
in addition to the usual gauge coupling unification. Recent surveys of Yukawa
unified SUSY GUT models predict an inverted scalar mass hierarchy in the
spectrum of sparticle masses if the superpotential mu term is positive. In
general, such models tend to predict an overabundance of dark matter in the
universe. We survey several solutions to the dark matter problem in Yukawa
unified supersymmetric models. One solution-- lowering the GUT scale mass value
of first and second generation scalars-- leads to u_R and c_R squark masses in
the 90-120 GeV regime, which should be accessible to Fermilab Tevatron
experiments. We also examine relaxing gaugino mass universality which may solve
the relic density problem by having neutralino annihilations via the Z or h
resonances, or by having a wino-like LSP.


title:
Phenomenology of flavor oscillations with non-perturbative effects from
  quantum field theory

abstract:
  We analyze phenomenological aspects of the quantum field theoretical
formulation of meson mixing and obtain the exact oscillation formula in the
presence of the decay. This formula is different from quantum mechanical
formula by additional high-frequency oscillation terms. In the infinite volume
limit, the space of the flavor quantum states is unitarily inequivalent to the
space of energy eigenstates.


title:
Collinear Photon Exchange in the Beam Normal Polarization Asymmetry of
  Elastic Electron-Proton Scattering

abstract:
  The parity-conserving single-spin beam asymmetry of elastic electron-proton
scattering is induced by an absorptive part of the two-photon exchange
amplitude. We demonstrate that this asymmetry has logarithmic and
double-logarithmic enhancement due to contributions of hard collinear
quasi-real photons. An optical theorem is used to evaluate the asymmetry in
terms of the total photoproduction cross section on the proton, predicting its
magnitude at a few parts per million for high electon beam energies and small
scattering angles. At fixed 4-momentum transfers, the asymmetry is rising
logarithmically with increasing electron beam energy, following the high-energy
diffractive behavior of total photoproduction cross section on the proton.


title:
Direct Detection of the Wino- and Higgsino-like Neutralino Dark Matters
  at One-Loop Level

abstract:
  The neutralino-nucleon (\tilde{\chi}^0-N) scattering is an important process
for direct dark matter searches. In this paper we discuss one-loop
contributions to the cross section in the wino-like and Higgsino-like LSP
cases. The neutralino-nucleon scattering mediated by the Higgs
\tilde{\chi}^0\tilde{\chi}^0 and Z\tilde{\chi}^0\tilde{\chi}^0 couplings at
tree level is suppressed by the gaugino-Higgsino mixing at tree level when the
neutralino is close to a weak eigenstate. The one-loop contribution to the
cross section, generated by the gauge interaction, is not suppressed by any
SUSY particle mass or mixing in the wino- and Higgsino-like LSP cases. It may
significantly alter the total cross section when \sigma_{\tilde{\chi}^0 N}\sim
10^{-45} cm^2 or less.


title: Hadronic EDMs in SUSY SU(5) GUTs with Right-handed Neutrinos

abstract:
  We discuss hadronic EDM constraints on the neutrino sector in the SUSY SU(5)
GUT with the right-handed neutrinos. The hadronic EDMs are sensitive to the
right-handed down-type squark mixings, especially between the second and third
generations and between the first and third ones, compared with the other
low-energy observables, and the flavor mixings are induced by the neutrino
Yukawa interaction. The current experimental bound of the neutron EDM may imply
that the right-handed tau neutrino mass is smaller than about 10^{14} GeV in
the minimal supergravity scenario, and it may be improved furthermore in future
experiments, such as the deuteron EDM measurement.


title: Improving the ultraviolet behavior in baryon chiral perturbation theory

abstract:
  We introduce a new formulation of baryon chiral perturbation theory which
improves the ultraviolet behavior of propagators and can be interpreted as a
smooth cutoff regularization scheme. It is equivalent to the standard approach,
preserves all symmetries and therefore satisfies the Ward identities. Our
formulation is equally well defined in the vacuum, one- and few-nucleon sectors
of the theory. The equations (Bethe-Salpeter, Lippmann-Schwinger, etc.) for the
scattering amplitudes of the few-nucleon sector are free of divergences in the
new approach. Unlike the usual cutoff regularization, our 'cutoffs' are
parameters of the Lagrangian and do not have to be removed.


title:
The anomalous magnetic moment of the muon in the MSSM - recent
  developments

abstract:
  We present recent results of two interesting classes of supersymmetric
two-loop contributions to (g-2)_mu. Two-loop diagrams involving either a closed
sfermion loop or a closed chargino/neutralino loop can amount to 5*10^{-10},
which is almost one standard deviation of the current experimental uncertainty.
We discuss the dependence of these two classes on the unknown supersymmetric
parameters and their impact on the supersymmetric prediction of (g-2)_mu.


title: Baryons and Pentaquarks in terms of Mesons

abstract:
  We investigate light meson bound state contributions to six quark Green's
functions and establish that the latter has poles corresponding to baryon bound
states. We estimate light baryon masses including the Roper resonance.
Constituent quark model and the Parton model are natural consequences of this
quantum field theoretic picture. We elaborate this analysis to pentaquarks and
heptaquarks. An almost model independent prediction for the mass of $\theta$
pentaquark is $1.57Gev$.


title: Proton Decay in Supersymmetric GUT Models

abstract:
  The instability of protons is a crucial prediction of supersymmetric GUTs. We
review the decay in minimal supersymmetric SU(5), which is dominated by
dimension-five operators, and discuss the implications of the failure of Yukawa
unification for the decay rate. In a consistent SU(5) model, where SU(5)
relations among Yukawa couplings hold, the proton decay rate can be several
orders of magnitude smaller than the present experimental bound. Finally, we
discuss orbifold GUTs, where proton decay via dimension-five operators is
absent. The branching ratios of dimension-six decay can significantly differ
from those in four dimensions.


title: THERMUS -- A Thermal Model Package for ROOT

abstract:
  THERMUS is a package of C++ classes and functions allowing
statistical-thermal model analyses of particle production in relativistic
heavy-ion collisions to be performed within the ROOT framework of analysis.
Calculations are possible within three statistical ensembles; a grand-canonical
treatment of the conserved charges B, S and Q, a fully canonical treatment of
the conserved charges, and a mixed-canonical ensemble combining a canonical
treatment of strangeness with a grand-canonical treatment of baryon number and
electric charge. THERMUS allows for the assignment of decay chains and detector
efficiencies specific to each particle yield, which enables sensible fitting of
model parameters to experimental data.


title: Is the a0(980) resonance a K anti-K bound state?

abstract:
  We have analysed properties of two resonances a0(980) and a0(1450) using the
pion-eta and K anti-K coupled channel model. Although the forces in the
scalar-isovector K anti-K channel are attractive the a0(980) resonance cannot
be interpreted as a kaon-antikaon bound state within our model.


title:
Subleading form factors at order 1/m_Q in terms of leading quantities
  using the non-forward amplitude in HQET

abstract:
  We consider the non-forward amplitude within the Heavy Quark Effective
theory. We show that one can obtain new information on the subleading
corrections in 1/m_Q. We illustrate the method by deriving new simple relations
between the functions Xsi_3(w) and Lambdabar Xsi(w) and the sums Sum_n
DeltaE^(n)_j tau^(n)_j(1) tau^(n)_j(w) (j=1/2,3/2), that involve leading
quantities, namely the Isgur-Wise functions tau^(n)_j(w) and the level spacings
DeltaE^(n)_j. The simplicity of our results follows from the fact that, for the
non-forward amplitude B(v_i)->D^(n)(v')->B(v_f), there are three variables
(w_i,w_f,w_if)=(v_i.v',v_f.v',v_i.v_f) independent in a certain domain, and we
consider the zero recoil frontier (w,1,w) where only a finite number of j^P
states contribute (1/2^+,3/2^+). These sum rules reduce to known results at
w=1, for Lambdabar obtainted by Voloshin, and for Xsi_3(1) obtained by Le
Yaouanc et al. and by Uraltsev, and generalizes them to all values of w. We
discuss phenomenological applications of these results, in particular the check
of Bakamjian-Thomas quark models and the comparison with the QCD Sum Rules
approach.


title:
Realistic Neutrino Masses from Multi-brane Extensions of the
  Randall-Sundrum Model?

abstract:
  Scenarios based on the existence of large or warped (Randall-Sundrum model)
extra dimensions have been proposed for addressing the long standing puzzle of
gauge hierarchy problem. Within the contexts of both those scenarios, a novel
and original type of mechanism generating small (Dirac) neutrino masses, which
relies on the presence of additional right-handed neutrinos that propagate in
the bulk, has arisen. The main objective of the present study is to determine
whether this geometrical mechanism can produce reasonable neutrino masses also
in the interesting multi-brane extensions of the Randall-Sundrum model. We
demonstrate that, in some multi-brane extensions, neutrino masses in agreement
with all relevant experimental bounds can indeed be generated but at the price
of a constraint (stronger than the existing ones) on the bulk geometry, and
that the other multi-brane models even conflict with those experimental bounds.


title: Physics Possibilities at a Linear Collider

abstract:
  We review some recent studies about the parameter determination of top
quarks, W bosons, Higgs bosons, supersymmetric particles and in the ADD model
of extra dimensions at a linear collider.


title: High Spins Beyond Rarita-Schwinger Framework

abstract:
  We study the eigenvalue problem of the squared Pauli-Lubanski vector, W^{2},
in the Spinor-Vector representation space and derive from it that the
-s(s+1)m^{2} subspace with s=3/2, i.e. spin 3/2 in the rest frame, is pinned
down by the one sole Klein-Gordon like equation, [
(p^{2}-m^{2})g_{\alpha\beta}-{2/3}p_{\beta}p_{\alpha}-
{1/3}(p_{\alpha}\gamma_{\beta}+p_{\beta}\gamma_{\alpha})\not p +{1/3}
\gamma_{\alpha}\not p \gamma_{\beta}\not p ] \psi^{\beta}=0. Upon gauging this
W^{2} invariant subspace of \psi_{\mu} is shown to couple to the
electromagnetic field in a fully covariant fashion already at zeroth order of
1/m and with the correct gyromagnetic factor of g_{s}=\frac{1}{s}. The gauged
equation is hyperbolic and hence free from the Velo-Zwanziger problem of
acausal propagation within an electromagnetic field at least to that order.


title: Supersymmetric SO(10) Models Inspired by Deconstruction

abstract:
  We consider 4-dimensional N=1 supersymmetric SO(10) models inspired by
deconstruction of 5-dimensional N=1 supersymmetric orbifold SO(10) models and
high dimensional non-supersymmetric SO(10) models with Wilson line gauge
symmetry breaking. We discuss the $SO(10) \times SO(10)$ models with
bi-fundamental link fields where the gauge symmetry can be broken down to the
Pati-Salam, $SU(5) \times U(1)$, flipped $SU(5) \times U(1)'$ or the standard
model like gauge symmetry. We also propose an $SO(10) \times SO(6) \times
SO(4)$ model with bi-fundamental link fields where the gauge symmetry is broken
down to the Pati-Salam gauge symmetry, and an $SO(10) \times SO(10)$ model with
bi-spinor link fields where the gauge symmetry is broken down to the flipped
$SU(5) \times U(1)'$ gauge symmetry. In these two models, the Pati-Salam and
flipped $SU(5) \times U(1)'$ gauge symmetry can be further broken down to the
standard model gauge symmetry, the doublet-triplet splittings can be obtained
by the missing partner mechanism, and the proton decay problem can be solved.
We also study the gauge coupling unification. We briefly comment on the
interesting variation models with gauge groups $SO(10) \times SO(6)$ and
$SO(10) \times flipped SU(5) \times U(1)'$ in which the proton decay problem
can be solved.


title:
Heavy-Quark Symmetry and the Electromagnetic Decays of Excited Charmed
  Strange Mesons

abstract:
  Heavy-hadron chiral perturbation theory (HH$\chi$PT) is applied to the decays
of the even-parity charmed strange mesons, D_{s0}(2317) and D_{s1}(2460).
Heavy-quark spin symmetry predicts the branching fractions for the three
electromagnetic decays of these states to the ground states D_s and D_s^* in
terms of a single parameter. The resulting predictions for two of the branching
fractions are significantly higher than current upper limits from the CLEO
experiment. Leading corrections to the branching ratios from chiral loop
diagrams and spin-symmetry violating operators in the HH$\chi$PT Lagrangian can
naturally account for this discrepancy. Finally the proposal that the
D_{s0}(2317) (D_{s1}(2460)) is a hadronic bound state of a D (D^*) meson and a
kaon is considered. Leading order predictions for electromagnetic branching
ratios in this molecular scenario are in very poor agreement with existing
data.


title: GeV to TeV astrophysical tau neutrinos

abstract:
  Neutrinos with energy greater than GeV are copiously produced in the p(A,p)
interactions occurring in several astrophysical sites such as (i) the earth
atmosphere, (ii) our galactic plane as well as in (iii) the galaxy clusters. A
comparison of the tau and mu neutrino flux in the presence of neutrino
oscillations from these three representative astrophysical sites is presented.
It is pointed out that the non-atmospheric tau neutrino flux starts dominating
over the downward going atmospheric tau neutrino flux for neutrino energy E as
low as 10 GeV. This energy value is much lower than the energy value, E \geq
5\times 10^4 GeV, estimated for the dominance of the non-atmospheric mu
neutrino flux, in the presence of neutrino oscillations. Future prospects for
possible observations of non-atmospheric tau neutrino flux are briefly
mentioned.