title:
Hadronic Cross-sections in two photon Processes at a Future Linear
  Collider

abstract:
  In this note we address the issue of measurability of the hadronic
cross-sections at a future photon collider as well as for the two-photon
processes at a future high energy linear $e^+e^-$ collider. We extend, to
higher energy, our previous estimates of the accuracy with which the \gamgam\
cross-section needs to be measured, in order to distinguish between different
theoretical models of energy dependence of the total cross-sections. We show
that the necessary precision to discriminate among these models is indeed
possible at future linear colliders in the Photon Collider option. Further we
note that even in the $e^+e^-$ option a measurement of the hadron production
cross-section via \gamgam processes, with an accuracy necessary to allow
discrimination between different theoretical models, should be possible. We
also comment briefly on the implications of these predictions for hadronic
backgrounds at the future TeV energy $e^+e^-$ collider CLIC.


title:
Extrapolation of the Zalpha-Expansion and Two--Loop Bound--State Energy
  Shifts

abstract:
  Quantum electrodynamic (QED) effects that shift the binding energies of
hydrogenic energy levels have been expressed in terms of a semi-analytic
expansion in powers of Zalpha and ln[(Zalpha)^{-2}], where Z is the nuclear
charge number and alpha is the fine-structure constant. For many QED effects,
numerical data are available in the domain of high Z where the Zalpha expansion
fails. In this Letter, we demonstrate that it is possible, within certain
limits of accuracy, to extrapolate the Zalpha-expansion from the low-Z to the
high-Z domain. We also review two-loop self-energy effects and provide an
estimate for the problematic nonlogarithmic coefficient B_60.


title:
Calculation of Magnetic Penguin Amplitudes in B -> phi K Decays using
  PQCD Approach

abstract:
  New physics contributions to B decays often arise through chromo-magnetic
penguin operators. To look for new physics effects in B decays, it is useful to
be able to estimate the hadronic matrix elements for the chromo-magnetic
operator. We compute this contribution to B ->phi K decays using PQCD methods.
It is shown that, if the Wilson coefficient of the new physics is same order of
magnitude as that of the Standard Model, this operator gives a non-negligible
contribution compared to that of the Standard Model (about 30%). We also
investigate the value of q^2, which is the momentum transferred by the gluon in
the chromo-magnetic penguin operator. We find that the expectation value <q^2>
is approximately M^2_B/4, in agreement with a naive guess. This result,
however, is very sensitive to the scale dependence of the Wilson coefficient.
We also show that the matrix element for the chromo-magnetic penguin operator
is independent of the choice of energy scale to a very good approximation.


title: Minimal Theoretical Uncertainties in Inflationary Predictions

abstract:
  During inflation, primordial energy density fluctuations are created from
approximate de Sitter vacuum quantum fluctuations redshifted out of the horizon
after which they are frozen as perturbations in the background curvature. In
this paper we demonstrate that there exists an intrinsic theoretical
uncertainty in the inflationary predictions for the curvature perturbations due
to the failure of the well known prescriptions to specify the vacuum uniquely.
Specifically, we show that the two often used prescriptions for defining the
initial vacuum state -- the Bunch-Davies prescription and the adiabatic vacuum
prescription (even if the adiabaticity order to which the vacuum is specified
is infinity) -- fail to specify the vacuum uniquely in generic inflationary
spacetimes in which the total duration of inflation is finite. This conclusion
holds despite the absence of any trans-Planckian effects or effective field
theory cutoff related effects. We quantify the uncertainty which is applicable
to slow roll inflationary scenarios as well as for general FRW spacetimes and
find that the uncertainty is generically small. This uncertainty should be
treated as a minimal uncertainty that underlies all curvature perturbation
calculations.


title: Effective number of neutrinos and baryon asymmetry from BBN and WMAP

abstract:
  We place constraints on the number of relativistic degrees of freedom and on
the baryon asymmetry at the epoch of Big Bang Nucleosynthesis (BBN) and at
recombination, using cosmic background radiation (CBR) data from the Wilkinson
Microwave Anisotropy Probe (WMAP), complemented by the Hubble Space Telescope
(HST) Key Project measurement of the Hubble constant, along with the latest
compilation of deuterium abundances and measurements of the primordial helium
abundance. The agreement between the derived values of these key cosmological
and particle physics parameters at these widely separated (in time or redshift)
epochs is remarkable. From the combination of CBR and BBN data, we find the
2\sigma ranges for the effective number of neutrinos and for the baryon
asymmetry (baryon to photon number ratio \eta) to be 1.7-3.0 and 5.53-6.76
\times 10^{-10}, respectively.


title: Soft Gluon Exponentiation and Resummation

abstract:
  In calculations of (semi-) inclusive events within perturbative Quantum
Chromodynamics, large logarithmic corrections arise from certain kinematic
regions of interest which need to be resummed. When resumming soft gluon
effects one encounters quantities built out of eikonal or Wilson lines (path
ordered exponentials). In this thesis we develop a simplified method to
calculate higher orders of the singular coefficients of parton distribution
functions which is based on the exponentiation of cross sections built out of
eikonal lines. As an illustration of the method we determine the previously
uncalculated fermionic contribution to the three-loop coefficient A^(3).
  The knowledge of these coefficients is not only important for the study of
the parton distribution functions themselves, but also for the resummation of
large logarithmic effects due to soft radiation in a variety of cross sections.
  In the second part of this thesis we study the energy flow pattern of this
soft radiation in jet events. We develop the concept of event shape-energy flow
correlations that suppress radiation from unobserved "minijets" outside the
region of interest and are sensitive primarily to radiation from the
highest-energy jets. We give analytical and numerical results at
next-to-leading logarithmic order for shape/flow correlations in e+e- dijet
events. We conclude by illustrating the application of our formalism to events
with hadrons in the initial state, where the shape/flow correlations can be
described via matrices in the space of color exchanges.


title: Kaluza-Klein/$Z'$ Differentiation at the LHC and Linear Collider

abstract:
  We explore the capabilities of the LHC and the Linear Collider(LC) to
distinguish the production of Kaluza-Klein(KK) excitations from an ordinary
$Z'$ within the context of theories with TeV scale extra dimensions. At the
LHC, these states are directly produced in the Drell-Yan channel while at the
LC the effects of their exchanges are indirectly felt as new contact
interactions in processes such as $e^+e^-\to f\bar f$. While we demonstrate
that the LC is somewhat more capable at KK/$Z'$ differentiation than is the
LHC, the simplest LC analysis relies upon the LHC data for the resonance mass
as an important necessary input.


title: U_A(1) Breaking Effects on the Light Scalar Meson Spectrum

abstract:
  Effects of the U_A(1) breaking interaction on the low-lying nonet scalar
mesons are studied using the extended Nambu-Jona-Lasinio model. The strength of
the U_A(1) breaking interaction is determined by the electromagnetic decays of
the eta meson. We find that the U_A(1) breaking interaction gives rise to about
150 MeV mass difference between the sigma and a_0 mesons. We also find that the
strangeness content in the \sigma meson is about 15%. The calculated mass of
the I=1/2 state is about 200 MeV heavier than that of the I=1 state. The order
of these masses is not likely to change within this model.


title: Factorization Approach for Inclusive Production of Doubly Heavy Baryon

abstract:
  We study inclusive production of doubly heavy baryon at a $e^+e^-$ collider
and at hadron colliders through fragmentation. We study the production by
factorizing nonpertubative- and perturbative effects. In our approach the
production can be thought as a two-step process: A pair of heavy quarks can be
produced perturbatively and then the pair is transformed into the baryon. The
transformation is nonperturbative. Since a heavy quark moves with a small
velocity in the baryon in its rest frame, we can use NRQCD to describe the
transformation and perform a systematic expansion in the small velocity. At the
leading order we find that the baryon can be formed from two states of the
heavy-quark pair, one state is with the pair in $^3S_1$ state and in color
${\bf \bar 3}$, another is with the pair in $^1S_0$ state and in color ${\bf
6}$. Two matrix elements are defined for the transformation from the two
states, their perturbative coefficients in the contribution to the
cross-section at a $e^+e^-$ collider and to the function of heavy quark
fragmentation are calculated. Our approach is different than previous
approaches where only the pair in $^3S_1$ state and in color ${\bf \bar 3}$ is
taken into account. Numerical results for $e^+e^-$ colliders at the two
$B$-factories and for hadronic colliders LHC and Tevatron are given.


title: Quark Propagator and Chiral Symmetry with String Tension

abstract:
  General properties of the light and heavy quark propagators have been
investigated in the context of string tension interaction. Confinement, chiral
symmetry breaking, spectral properties of the propagator are analytically
studied and numerically validated. We show that the propagator is analytic in
the infrared region even for massless quarks with a non zero radius of
convergence. Emergence of more than one mass scale is exemplified. Massless
limit of the quark propagator does exhibit critical behaviour.


title: Mesons: Relativistic Bound States with String Tension

abstract:
  A systematic method of analysing Bethe-Salpeter equation using spectral
representation for the relativistic bound state wave function is given. This
has been explicitly applied in the context of perturbative QCD with string
tension in the $1 \over N$ expansion. We show that there are only a few stable
bound state mesons due to the small "threshold mass"(constituent mass) of
quarks. The asymptotic properties of the bound states are analytically
analysed. The spectrum is derived analytically and compared phenomenologically.
Chiral symmetry breaking and PCAC results are demonstrated. We make a simple
minded observation to determine the size of the bound states as a function of
the energy of the boundstate.


title: Higgs CP from H/A -> tau tau decay

abstract:
  We show how the transverse tau tau spin correlations can be used to measure
the parity of the Higgs boson and hence to distinguish a CP-even H boson from
CP-odd A in the future high energy accelerator experiments. We investigate the
subsequent decays of the tau into pi nu and rho nu. The prospects for the
measurement of the Higgs boson parity with a mass of 120 GeV are quantified for
the case of e+ e- collisions of 500 GeV center of mass energy. The Standard
Model Higgsstrahlung production process is used as an example.


title:
Comparing the Higgs Sector of Electroweak Theory with the Scalar Sector
  of Low Energy QCD

abstract:
  We first review how the simple K-matrix unitarized linear SU(2) sigma model
can explain the experimental data in the scalar pi pi scattering channel of QCD
up to about 800 MeV. Since it is just a scaled version of the minimal
electroweak Higgs sector, which is often treated with the same unitarization
method, we interpret the result as support for this approach in the electroweak
model with scaled values of tree level Higgs mass up to at least about 2 TeV.
We further note that the relevant QCD effective Lagrangian which fits the data
to still higher energies using the same method involves another scalar
resonance. This suggests that the method should also be applicable to
corresponding beyond minimal electroweak models. Nevertheless we note that even
with one resonance, the minimal K matrix unitarized model behaves smoothly for
large bare Higgs mass by effectively "integrating out" the Higgs while
preserving unitarity. With added confidence in this simple approach we make a
survey of the Higgs sector for the full range of bare Higgs mass. One amusing
point which emerges is that the characteristic factor of the W-W fusion
mechanism for Higgs production peaks at the bare mass of the Higgs boson, while
the characteristic factor for the gluon fusion mechanism peaks near the
generally lower physical mass.


title:
Production of $J/\psi +c\bar{c}$ through two photons in $e^+e^-$
  annihilation

abstract:
  We study the production of $J/\psi+c\bar{c}$ in $e^+e^-$ annihilation through
two virtual photons. The cross section is estimated to be 23 fb at
$\sqrt{s}=10.6$ GeV, which is smaller by a factor of six than the calculated
cross section for the same process but through one virtual photon. As a result,
while the annihilation into two photons may be important for certain exclusive
production processes, the big gap between the inclusive production cross
section $\sigma(e^+e^- \to J/\psi + c\bar{c})\simeq$ 0.9pb observed by Belle
and the current nonrelativistic QCD prediction of $\simeq$0.15pb still remains
very puzzling. We find, however, as the center-of-mass energy increases
($\sqrt{s}>20$ GeV) the production through two virtual photons $e^+e^- \to
2\gamma^* \to J/\psi + c\bar{c}$ will prevail over that through one virtual
photon, because in the former process the photon fragmentation into $J/\psi$
and into the charmed quark pair becomes more important at higher energies.


title: Proton-carbon CNI polarimetry and the spin-dependence of the Pomeron

abstract:
  Recent polarized proton experiments at Brookhaven National Laboratory are
used as a basis for a model of the energy dependence of the analyzing power of
proton-carbon elastic scattering. In addition to their practical value for
polarimetry, the results of this analysis give constraints on the size of the
Pomeron spin-flip coupling as well as information on the $f_2$ and $\omega$
spin-flip couplings.


title: Brane Localized Curvature for Warped Gravitons

abstract:
  We study the effects of including brane localized curvature terms in the
Randall-Sundrum (RS) model of the hierarchy. This leads to the existence of
brane localized kinetic terms for the graviton. Such terms can be induced by
brane and bulk quantum effects as well as Higgs-curvature mixing on the brane.
We derive the modified spectrum of Kaluza-Klein (KK) gravitons and their
couplings to 4-dimensional fields in the presence of these terms. We find that
the masses and couplings of the KK gravitons have considerable dependence on
the size of the brane localized terms; the weak-scale phenomenology of the
model is consequently modified . In particular, the weak-scale spin-2 graviton
resonances which generically appear in the RS model may be significantly
lighter than previously assumed. However, they may avoid detection as their
widths may be too narrow to be observable at colliders. In the contact
interaction limit, for a certain range of parameters, the experimental reach
for the scale of the theory is independent of the size of the boundary terms.


title:
Associated Higgs production with top quarks at the Large Hadron
  Collider: NLO QCD corrections

abstract:
  We present in detail the calculation of the O(alpha_s^3) inclusive total
cross section for the process pp -> t-tbar-h, in the Standard Model, at the
CERN Large Hadron Collider with center-of-mass energy sqrt(s_H)=14 TeV. The
calculation is based on the complete set of virtual and real O(alpha_s)
corrections to the parton level processes q-qbar -> t-tbar-h and gg ->
t-tbar-h, as well as the tree level processes (q,qbar)g -> t-tbar-h-(q,qbar).
The virtual corrections involve the computation of pentagon diagrams with
several internal and external massive particles, first encountered in this
process. The real corrections are computed using both the single and the two
cutoff phase space slicing method. The next-to-leading order QCD corrections
significantly reduce the renormalization and factorization scale dependence of
the Born cross section and moderately increase the Born cross section for
values of the renormalization and factorization scales above m_t.


title:
Fermion Masses and Mixing and CP-Violation in SO(10) Models with Family
  Symmetries

abstract:
  Several ideas for solving the problem of fermion mass hierarchy and mixing
and specific supersymmetric models that realize it are reviewed. In particular,
we discuss many models based on SO(10) in four dimensions combined with a
family symmetry to accommodate fermion mass hierarchy and mixing, including the
case of neutrinos. These models are compared and various tests that can be used
to distinguish these models are suggested. We also include a discussion of a
few SO(10) models in higher space-time dimensions.


title: Testing Supersymmetric Grand Unified Models of Inflation

abstract:
  We reconsider a class of well motivated supersymmetric models in which
inflation is associated with the breaking of a gauge symmetry G to H, with the
symmetry breaking scale M~10^16 GeV. Starting with a renormalizable
superpotential, we include both radiative and supergravity corrections to
derive the inflationary potential. The scalar spectral index n_s can exceed
unity in some cases, and it cannot be smaller than 0.98 if the number of
e-foldings corresponding to the present horizon scale is around 60. Two
distinct variations of this scenario are discussed in which non-renormalizable
terms allowed by the symmetries are included in the superpotential, and one
finds n_s>=0.97.
  The models discussed feature a tensor to scalar ratio r<~10^-4, while
dn_s/dlnk<~10^-3. If G corresponds to SO(10) or one of its rank five subgroups,
the observed baryon asymmetry is naturally explained via leptogenesis.


title: Explaining Why the u and d Quark Masses are Similar

abstract:
  An approach is suggested for modeling quark and lepton masses and mixing in
the context of grand unified theories that explains the curious fact that m_u ~
m_d even though m_t >> m_b. The structure of the quark mass matrices is such as
to allow a non-Peccei-Quinn solution of the Strong CP Problem.


title:
Analytic invariant charge and the lattice static quark-antiquark
  potential

abstract:
  A recently developed model for the QCD analytic invariant charge is compared
with quenched lattice simulation data on the static quark-antiquark potential.
By employing this strong running coupling one is able to obtain the confining
quark-antiquark potential in the framework of the one-gluon exchange model. To
achieve this objective a technique for evaluating the integrals of a required
form is developed. Special attention is paid here to removing the divergences
encountered the calculations. All this enables one to examine the asymptotic
behavior of the potential at both small and large distances with high accuracy.
An explicit expression for the quark-antiquark potential, which interpolates
between these asymptotics, and satisfies the concavity condition, is proposed.
The derived potential coincides with the perturbative results at small
distances, and it is in a good agreement with the lattice data in the
nonperturbative physically-relevant region. An estimation of the parameter
$\Lambda_{QCD}$ is obtained for the case of pure gluodynamics. It is found to
be consistent with all the previous estimations of $\Lambda_{QCD}$ in the
framework of approach in hand.


title: Polychromatic Grand Unification

abstract:
  The possibility of achieving a gauge coupling grand unification by increasing
the QCD degrees of freedom at higher energies is investigated. When confronted
with precision low-energy data, the generic weak-mixing angle relation
sin^2(theta_W) = N/2(N+1) requires N=7 colors at the GUT scale M_U ~ 10^17 GeV.
With the exclusive addition of light Higgs doublets to the standard model
particle content, such a unification may also occur if N=5 at M_U ~ 10^16 GeV.


title: DIAL: Distributed Interactive Analysis of Large Datasets

abstract:
  DIAL will enable users to analyze very large, event-based datasets using an
application that is natural to the data format. Both the dataset and the
processing may be distributed over a farm, a site (collection of farms) or a
grid (collection of sites). Here we describe the goals of the project, the
current design and implementation, and plans for future development. DIAL is
being developed within PPDG to understand the requirements that interactive
analysis places on the grid and within ATLAS to enable distributed interactive
analysis of event data.


title: Heavy flavor production off protons and in a nuclear environment

abstract:
  These lectures present an overview of the current status of the QCD based
phenomenology for open and hidden heavy flavor production at high energies. A
unified description based on the light-cone color-dipole approach is employed
in all cases. A good agreement with available data is achieved without fitting
to the data to be explained, and nontrivial predictions for future experiments
are made. The key phenomena under discussion are: (i) formation of the wave
function of a heavy quarkonium; (ii) quantum interference and coherence length
effects; (iii) Landau-Pomeranchuk suppression of gluon radiation leading to
gluon shadowing and nuclear suppression of heavy flavors; (iv) higher twist
shadowing related to the finite size of heavy quark dipoles; (v) higher twist
corrections to the leading twist gluon shadowing making it process dependent.


title: Higgs boson decay in the large N limit

abstract:
  The Equivalence Theorem is commonly used to calculate perturbatively
amplitudes involving gauge bosons at energy scales higher than gauge boson
masses. However, when the scalar sector is strongly interacting the theory is
non-perturbative. We show that the Equivalence Theorem holds in the large N
limit at next-to-leading order by calculating the decay widths h -> W^{+}W^{-}
and h->\pi^{+}\pi^{-}. We also show, in the same scheme of calculations, that
unitarity is fulfilled for the process h->\pi^{+}\pi^{-}.


title:
Renormalization of the Cabibbo-Kobayashi-Maskawa Matrix at One-Loop
  Level

abstract:
  We have investigated the present renormalization prescriptions of
Cabibbo-Kobayashi-Maskawa (CKM) matrix at one-loop level. We emphasize at one
prescription which is formulated with reference to the case of no mixing of
quark's generations and point out that it doesn't make the physical amplitude
involving quark mixing ultraviolet finite. We then propose a revised
prescription to solve this problem and simultaneously keep the unitarity of the
CKM matrix. Through explicit calculations we also prove that in order to keep
the CKM matrix gauge independent the unitarity of the CKM matrix must be
preserved.


title: A flux tube model for glueballs

abstract:
  We calculate the mass spectrum and the decay widths of glueballs in the flux
tube model. The glueball is assumed to be a closed flux tube. The breathing
motion and the rotational motion are investigated using the WKB approximation.
The calculated spectra is consistent with those by lattice QCD. The decay
widths are also computed using Schwinger mechanism and it is shown that they
have rather large values.


title: Latent heat in the chiral phase transition

abstract:
  The chiral phase transition at finite temperature and density is discussed in
the framework of the QCD-like gauge field theory. The thermodynamical potential
is investigated using a variational approach. Latent heat generated in the
first-order phase transition is calculated. It is found that the latent heat is
enhanced near the tricritical point and is more than several hundred MeV per
quark.


title:
Fluctuation Studies at the Subnuclear Level of Matter: Evidence for
  Stability, Stationarity and Scaling

abstract:
  It is pointed out that the concepts and methods introduced by Bachelier and
by Mandelbrot to Finance and Economics can be used to examine the fluctuations
observed in high-energy hadron production processes. Theoretical arguments and
experimental evidences are presented which show that the relative variations of
hadron-numbers between successive rapidity intervals are non-Gaussian stable
random variables, which exhibit stationarity and scaling. The implications of
the obtained results are discussed.


title: Universal threshold enhancement

abstract:
  By assuming certain analytic properties of the propagator, it is shown that
universal features of the spectral function including threshold enhancement
arise if a pole describing a particle at high temperature approaches in the
complex energy plane the threshold position of its two-body decay with the
variation of T. The case is considered, when one can disregard any other decay
processes. The quality of the proposed description is demonstrated by comparing
it with the detailed large N solution of the linear sigma model around the
pole-threshold coincidence.


title: MSSM Higgs Decays to Bottom Quark Pairs revisited

abstract:
  We present an update of neutral Higgs boson decays into bottom quark pairs in
the minimal supersymmetric extension of the Standard Model. In particular the
resummation of potentially large higher-order corrections due to the soft SUSY
breaking parameters A_b and mu is extended. The remaining theoretical
uncertainties due to unknown higher-order SUSY-QCD corrections are analyzed
quantitatively.


title: Exclusive J/\psi Productions at e^+ e^- Colliders

abstract:
  Exclusive quarkonium pair production in electron-positron collisions is
studied in non-relativistic QCD. The obtained cross section for J/\psi + \eta_c
production in the leading order is confronted against the recent measurements
by the Belle Collaboration at KEKB. It is shown that a large renormalization
K-factor is necessary to explain the experimental data. We point out that the
J^{PC}=0^{-+} nature of the hadronic systems that are assigned to be \eta_c
should be tested by the triple angular distributions in terms of the scattering
angle, and, polar and azimuthal angles of J/\psi into leptons. We further study
J/\psi + J/\psi and \Upsilon + \Upsilon productions at LEP energies. Although
the axial-vector couplings of the Z-boson to charm and bottom quarks allow
production of such pairs when one of them is polarised transversally and the
other longitudinally, we find that the integrated luminosity at Z pole
accumulated by LEP is not large enough to observe the exclusive pair production
of quarkonium.


title:
Definition and Calculation of Bottom Quark Cross-Sections in
  Deep-inelastic Scattering at HERA and Determination of their Uncertainties

abstract:
  The uncertainties involved in the calculation of bottom quark cross-sections
in deep-inelastic scattering at HERA are studied in different phase space
regions. Besides the inclusive bottom quark cross-section, definitions closer
to the detector acceptance requiring at least one high energetic muon from the
semi-leptonic \bquark decay or a jet with high transverse energy are
investigated. For each case the uncertainties due to the choice of the
renormalisation and factorisation scale as well as the \bquark mass are
estimated in the perturbative NLO QCD calculation and furthermore uncertainties
in the fragmenation of the bottom quark to a B-meson and in its semi-leptonic
decay are discussed.


title: Delta I=1/2 and epsilon'/epsilon in Large-Nc QCD

abstract:
  We present new results for the matrix elements of the Q_6 and Q_4 penguin
operators, evaluated in a large-Nc approach which incorporates important
O(N_c^2\frac{n_f}{N_c}) unfactorized contributions. Our approach shows analytic
matching between short- and long-distance scale dependences within dimensional
renormalization schemes, such as MS-bar. Numerically, we find that there is a
large positive contribution to the Delta I =1/2 matrix element of Q_6 and hence
to the direct CP-violation parameter epsilon'/epsilon. We also present results
for the Delta I = 1/2 rule in K -> pi pi amplitudes, which incorporate the
related and important ``eye-diagram'' contributions of O(N_c^2\frac{1}{N_c})
from the Q_2 operator (i.e. the penguin-like contraction). The results lead to
an enhancement of the Delta I = 1/2 effective coupling. The origin of the large
unfactorized contributions which we find is discussed in terms of the relevant
scales of the problem.


title:
Studying top quark pair production at a linear collider with a program
  'eett6f'

abstract:
  Some features of a program 'eett6f' for top quark pair production and decay
into six fermions at linear colliders are discussed. Lowest order standard
model predictions for cross sections of some six fermion channels and for the
top quark decay width are confronted with the predictions obtained within a
model with an anomalous Wtb coupling. The question of wether non doubly
resonant background can easily be reduced by imposing kinematical cuts is
addressed.


title: The MSW effect and Solar Neutrinos

abstract:
  The MSW (Mikheyev-Smirnov-Wolfenstein) effect is the effect of transformation
of one neutrino species (flavor) into another one in a medium with varying
density. Three basic elements of the effect include: the refraction of
neutrinos in matter, the resonance (level crossing) and the adiabaticity. The
key notion is {\it the neutrino eigenstates} in matter. Physical picture of the
effect is described in terms of the flavors and the relative phases of
eigenstates and the transitions between eigenstates. Features of the large
mixing realization of the MSW effect are discussed. The large mixing MSW effect
(LMA) provides the solution of the solar neutrino problem. We show in details
how this mechanism works. Physics beyond the LMA solution is discussed. The
lower $Ar$-production rate (in comparison with the LMA prediction) and absence
of significant "turn up" of the spectrum at low energies can be due to an
additional effect of the light sterile neutrino with very small mixing.


title:
Right-handed Dirac Neutrinos in $\nu e^{-}$ Scattering and Azimuthal
  Asymmetry in Recoil Electron Event Rates

abstract:
  In this paper a scenario with the participation of the exotic scalar S,
tensor T and pseudoscalar couplings of the right-handed neutrinos in addition
to the standard vector V, axial A couplings of the left-handed neutrinos in the
low-energy $(\nu_{\mu}e^{-})$ and $(\nu_{e}e^{-})$ scattering processes is
considered. Neutrinos are assumed to be massive Dirac fermions and to be
polarized. Both reactions are studied at the level of the four-fermion point
interaction. The main goal is to show that the physical consequence of the
presence of the right-handed neutrinos is an appearance of the azimuthal
asymmetry in the angular distribution of the recoil electrons caused by the
non-vanishing interference terms between the standard and exotic couplings,
proportional to the transverse neutrino polarization vector. The upper limits
on the expected effect of this asymmetry for the low-energy neutrinos $(E_{\nu}
< 1 MeV)$ are found. We also show that if the neutrino helicity rotation
$(\nu_{eL} \to \nu_{eR})$ in the solar magnetic field takes place, the similar
effect of the azimuthal asymmetry of the recoil electrons scattered by the
solar neutrinos should be observed. This effect would also come from the
interference terms between the standard $(V, A)_{L}$ and exotic $(S, T, P)_{R}$
couplings. New-type neutrino detectors with good angular resolution could
search for the azimuthal asymmetry in event number.


title: Gauge dependence identities for color superconducting QCD

abstract:
  Using generalized Nielsen identities a formal proof is given that the
fermionic quasiparticle dispersion relations in a color superconductor are
gauge independent. This turns out to involve gluonic tadpoles which are
calculated to one-loop order in a two-flavor color superconductor. Regarding
the appearance of gluon tadpoles, we argue that in QCD the color
superconducting phase is automatically color neutral.


title: Towards a No-Lose Theorem for NMSSM Higgs Discovery at the LHC

abstract:
  We scan the parameter space of the NMSSM for the observability of a Higgs
boson at the LHC with $300 {\rm fb}^{-1}$ integrated luminosity per detector,
taking the present LEP constraints into account. We focus on the regions of
parameter space for which none of the usually considered LHC detection modes
are viable due to the fact that the only light non-singlet (and, therefore,
potentially visible) Higgs boson, $h$, decays mainly to two CP-odd light Higgs
bosons, $h\to a a$. We simulate the $WW\to h \to aa$ detection mode. We find
that this signal may be detectable at the LHC as a signal/background $\sim
600/600$ bump in the tail of a rapidly falling mass distribution. If further
study gives us confidence that the shape of the background tail is predictable,
then we can conclude that NMSSM Higgs detection at the LHC will be possible
throughout all of parameter space by combining this signal with the usual
detection modes previously simulated by ATLAS and CMS. We also show that this
$WW\to h\to aa$ signal will be highly visible at the LC due to its cleaner
environment and high luminosity. We present a study of the production modes and
decay channels of interest at the LC.


title: Mixing Renormalization for Scalar Fields

abstract:
  We consider the renormalization of theories with many scalar fields. We
discuss at the one-loop level some simple, non-gauge models with an arbitrary
number of scalars and fermions both in mass-shell and MS schemes. In MS scheme
we give a detailed qualitative analysis of the RG flow of dimensionless
couplings in flavor space.


title: Progress in neutrino oscillation searches and their implications

abstract:
  Neutrino Oscillation, in which a given flavour of neutrino transforms into
another is a powerful tool for probing small neutrino masses. The intrinsic
neutrino properties involved are neutrino mass squared difference $\Delta m^2$
and the mixing angle in vacuum $\theta$. In this talk I will summarize the
progress that we have achieved in our search for neutrino oscillation with
special emphasis on the recent results from the Sudbury Neutrino Observatory
(SNO) on the measurement of solar neutrino fluxes. I will outline the current
bounds on the neutrino masses and mixing parameters and discuss the major
physics goals of future neutrino experiments in the context of the present
picture.


title:
Classical Gluodynamics of High Energy Nuclear Collisions: an Erratum and
  an Update

abstract:
  We comment on the relation of our previous work on the classical gluodynamics
of high energy nuclear collisions to recent work by Lappi (hep-ph/0303076).
While our results for the non-perturbative number liberation coefficient agree,
those for the energy disagree by a factor of 2. This discrepancy can be traced
to an overall normalization error in our non-perturbative formula for the
energy. When corrected for, all previous results are in excellent agreement
with those of Lappi. The implications of the results of these two independent
computations for RHIC phenomenology are noted.


title:
Lepton flavor violating processes $l_{i}\longrightarrow
  l_{j}\nu_{l}\bar{\nu}_{l}$ in topcolor-assisted technicolor models

abstract:
  We study the lepton flavor violating (LFV) processes $l_{i}\longrightarrow
l_{j}\nu_{l}\bar{\nu}_{l}$ in the context of the topcolor-assisted technicolor
(TC2) models. We find that the branching ratios $B_{r}(\tau\longrightarrow
l_{j}\nu_{\tau}\bar{\nu}_{\tau})$ are larger than the branching ratios
$B_{r}(\tau\longrightarrow l_{j}\nu_{l}\bar{\nu}_{l})$ in all of the parameter
space. Over a wide range of parameter space, we have $B_{r}(\tau\longrightarrow
l_{j}\nu_{\tau}\bar{\nu}_{\tau})\sim 10^{-6}$ and $B_{r}(\tau\longrightarrow
l_{j}\nu_{l}\bar{\nu}_{l})\sim 10^{-9} (l=\mu$ or $e)$. Taking into account the
bounds given by the experimental upper limit
$Br^{exp}(\mu\longrightarrow3e)\leq1\times10^{-12}$ on the free parameters of
TC2 models, we further give the upper limits of the LFV processes
$l_{i}\longrightarrow l_{j}\nu_{l}\bar{\nu}_{l}$. We hope that the results may
be useful to partly explain the data of the neutrino oscillations and the
future neutrino experimental data might be used to test TC2 models.


title: Gaugino non-universality and dark matter

abstract:
  We study the effect of departures from SUSY GUT gaugino universality on the
neutralino relic density, and both its direct and neutrino indirect detection.
We find that the most interesting models are those with a value of $M_3|_{GUT}$
lower than the universal case.


title:
Instability of the hedgehog shape for the octet baryon in the chiral
  quark soliton model

abstract:
  In this paper the stability of the hedgehog shape of the chiral soliton is
studied for the octet baryon with the SU(3) chiral quark soliton model. The
strangeness degrees of freedom are treated by a simplified bound-state
approach, which omits the locality of the kaon wave function. The mean field
approximation for the flavor rotation is applied to the model. The classical
soliton changes shape according to the strangeness. The baryon appears as a
rotational band of the combined system of the deformed soliton and the kaon.


title: Sliding Singlet Mechanism Revisited

abstract:
  We show that the unification of the doublet Higgs in the standard model (SM)
and the Higgs to break the grand unified theory (GUT) group stabilizes the
sliding singlet mechanism which can solve the doublet-triplet (DT) splitting
problem. And we generalize this attractive mechanism to apply it to many
unified scenarios. In this paper, we try to build various concrete E_6 unified
models by using the generalized sliding singlet mechanism.


title: Open charm production in binary reactions within the Regge theory

abstract:
  We analyze the open charm production in the binary $\pi p \to \bar{D}
\Lambda_c$ and $\pi(\rho) J/\psi$ reactions within the Regge theory including
the absorption corrections. The calculations show that the total cross section
is about a few $\mu$b for the first processes and a few mb for the second
reactions at energy close to the threshold. Then it decreases with increasing
energy according to the true Regge asymptotics.


title: QCD Condensates for the Light Quark V-A Correlator

abstract:
  We use the procedure of pinched-weight Finite Energy Sum Rules (pFESR) to
determine the OPE coefficients a_6, ...,a_16 of the flavor ud V-A correlator in
terms of existing hadronic tau decay data. We show by appropriate weight
choices that the error on the dominant d=6 contribution, which is known to be
related to the K -> Pi Pi matrix elements of the electroweak penguin operator
in the chiral limit, may be reduced to below the ~15% level. The values we
obtain for the OPE coefficients with d>8 are shown to naturally account for the
discrepancies between our results for the d=6 and d=8 terms and those of
previous analyses, which were obtained neglecting d>8 contributions.


title: Some consequences of brane kinetic terms for bulk fermions

abstract:
  In theories with extra dimensions there are generically brane kinetic terms
for fields living in the bulk. These modify the masses and wave functions of
the Kaluza-Klein expansions, and then the effective four dimensional gauge and
Yukawa couplings of the corresponding modes. Here, we discuss some
phenomenological consequences of fermion brane kinetic terms, emphasizing their
implications for models with low compactification scales, whose agreement with
experiment can be improved, and observable effects at collider energies, like
the production of new fermions.


title: Neutron Charge Radius: Relativistic Effects and the Foldy Term

abstract:
  The neutron charge radius is studied within a light-front model with
different spin coupling schemes and wave functions. The cancellation of the
contributions from the Foldy term and Dirac form factor to the neutron charge
form factor is verified for large nucleon sizes and it is independent of the
detailed form of quark spin coupling and wave function. For the physical
nucleon our results for the contribution of the Dirac form factor to the
neutron radius are insensitive to the form of the wave function while they
strongly depend on the quark spin coupling scheme.


title: The DIRAC experiment at CERN

abstract:
  The DIRAC experiment at CERN aims to measure the lifetime of the pionium atom
($A_{2\pi}$), a $\pi^+\pi^-$ bound state with an accuracy of 10%. The
experimental setup consists of a high precision magnetic double arm
spectrometer, located at the high intensity proton beam of the CERN Proton
Synchrotron. This measurement will provide - in a model independent way - the
S-wave pion scattering length difference $|a_0 - a_2|$ with 5% precision.


title:
Testing the Nature of the D_{sJ}^*(2317)^+ and D_{sJ}(2463)^+ States
  Using Radiative Transitions

abstract:
  The Babar and CLEO collaborations have recently observed states decaying to
D_s^+\pi^0 and D_s^{*+}\pi^0 respectively and suggest the possible explanation
that they are the missing P-wave c\bar{s} states with J^P=0^+ and 1^+. In this
note we compare the properties of the D_{sJ}^*(2317)^+ and D_{sJ}(2463)^+
states to those expected of the c\bar{s} D_{s0}^* and D_{s1} states. We expect
the D_{s0}^* and D_{s1} with the reported masses to be extremely narrow, \Gamma
\sim {\cal O}(10\hbox{keV}), with large branching ratios to D^*_s\gamma for the
D_{s0}^* and to D^*_s\gamma and D_s\gamma for the D_{s1}. Crucial to this
interpretation of the Babar and CLEO observations is the measurement of the
radiative transitions. We note that it may be possible to observe the
$D_{s1}(2536)$ in radiative transitions to the $D_s^*$.


title:
Minimal supersymmetric standard model with gauge mediated supersymmetry
  breaking and neutrinoless double beta decay

abstract:
  The Minimal Supersymmetric Standard Model with gauge mediated supersymmetry
breaking and trilinear R-parity violation is applied to the description of
neutrinoless double beta decay. A detailed study of limits on the parameter
space coming from the B to (X,gamma) processes by using the recent CLEO results
is performed. The importance of two-nucleon and pion-exchange realizations of
neutrinoless double beta decay together with gluino and neutralino
contributions to this process are addressed. We have deduced new limits on the
trilinear R-parity breaking parameter lambda_{111}' from the non-observability
of 0 nu beta beta in several medium and heavy open-shell nuclei for different
gauge mediated breaking scenarios. In general, they are stronger than those
known from other analyses. Also some studies with respect to the future
neutrinoless double beta decay projects are presented.


title: Diffractive Dissociation into Two Jets

abstract:
  We report a study of the processes of coherent a pion and a photon
diffraction dissociation into two jets. The structure of non-factorizable
contributions in these reactions is discussed. We argue that production of hard
dijets by real photons can provide direct evidence for chirality violation in
hard processes and the first measurement of the magnetic susceptibility of the
quark condensate.


title:
Sensitivity to Contact Interactions and Extra Dimensions in Di-lepton
  and Di-photon Channels at Future Colliders

abstract:
  Virtual effects from a generic description of physics beyond the Standard
Model in terms of contact interactions, or from large extra dimensions will
modify the observed cross sections for easy to detect final states like lepton
or photon pairs, and can be used to probe scales much higher than the
center-of-mass energy of the partons initiating the interactions. In this note
the sensitivity reach of the Large Hadron Collider to contact interactions in
the Drell-Yan channels and of a Future Linear Collider to contact interactions
and extra dimensions in $e^+e^-$, $\mu^+\mu^-$ and $\gamma\gamma$ final states
are studied. Experimental aspects of the measurements, systematic error effects
and the evolution of the search reach with accumulated luminosity are
considered.


title:
Study of Parton Density Function Uncertainties with LHAPDF and PYTHIA at
  LHC

abstract:
  The experimental errors in current and future hadron colliders are expected
to decrease to a level that will challenge the uncertainties in the theoretical
calculations. One important component in the prediction uncertainties comes
from the Parton Density Functions of the (anti)proton. In this work we develop
an interface from the Les Houches Accord Parton Density Functions (LHAPDF)
package to the very popular Monte Carlo generator {\tt PYTHIA} version 6.2.
Then we proceed to estimate the PDF uncertainties for the production of
Drell-Yan pairs from the Z pole to masses above 1 $\TeV$ and for Higgs bosons
at LHC. The measurement of the electro-weak mixing angle at LHC as a
particularly difficult case is studied.


title:
On the two-loop Yukawa corrections to the MSSM Higgs boson masses at
  large tan(beta)

abstract:
  We complete the effective potential calculation of the two-loop, top/bottom
Yukawa corrections to the Higgs boson masses in the Minimal Supersymmetric
Standard Model, by computing the O(at^2 + at*ab + ab^2) contributions for
arbitrary values of the bottom Yukawa coupling. We also compute the corrections
to the minimization conditions of the effective potential at the same
perturbative order. Our results extend the existing O(at^2) calculation, and
are relevant in regions of the parameter space corresponding to tan(beta) >> 1.
We extend to the Yukawa corrections a convenient renormalization scheme,
previously proposed for the O(ab*as) corrections, that avoids unphysically
large threshold effects associated with the bottom mass and absorbs the bulk of
the corrections into the one-loop expression. For large values of tan(beta),
the new contributions can account for a variation of several GeV in the
lightest Higgs boson mass.


title: Upward Tau Air Showers from Earth

abstract:
  We estimate the rate of observable Horizontal and Upward Tau Air-Showers
(HORTAUs, UPTAUS) considering both the Earth opacity and the finite size of the
terrestrial atmosphere. We calculate the effective target volumes and masses
for Tau air-showers emerging from the Earth. The resulting model-independent
masses for satellite experiments such as EUSO may encompass at E_nu_tau = 10^19
eV a very large volume, V= 1020 km^3. Adopting simple power law neutrino
fluxes, E^-2 and E^-1, calibrated to GZK-like and Z-Burst-like models, we
estimate that at E= 10^19 eV nearly half a dozen horizontal shower events
should be detected by EUSO in three years of data collection by the
"guaranteed" GZK neutrino flux. We also find that the equivalent mass for an
Earth outer layer made of rock is dominant compared to the water, contrary to
simplified all-rock/all-water Earth models and previous Montecarlo simulations.
Therefore we expect an enhancement of neutrino detection along continental
shelves nearby the highest mountain chains, also given the better geometrical
acceptance for Earth skimming neutrinos. The Auger experiment might reveal such
a signature at E_nu= 10^{18} eV (with 26 events in 3 yr) towards the Andes, if
the angular resolution at the horizon (both in azimuth and zenith) would reach
an accuracy of nearly one degree needed to disentangle tau air showers from
common UHECR. The number of events increases at lower energies; therefore we
suggest an extension of the EUSO and Auger sensitivity down to (or even below)
E_nu = 10^19 eV and E_nu = 10^18 eV respectively.


title: Fermion Generations, Masses and Mixing Angles from Extra Dimensions

abstract:
  We discuss a toy model in six dimensions that predicts two fermion
generations, natural mass hierarchy and intergenerational mixing. Matter is
described by vector-like six dimensional fermions, one per each irreducible
standard model representation. Two fermion generations arise from the
compactification mechanism, through orbifold projection. They are localized in
different regions of the compact space by a six dimensional mass term. Flavour
symmetry is broken via Yukawa couplings, with a Higgs vacuum expectation value
not constant in the extra space. A hierarchical spectrum is obtained from order
one dimensionless parameters of the six dimensional theory. The Cabibbo angle
arises from the soft breaking of six dimensional parity symmetry. We also
briefly discuss how the present model could be extended to cover the realistic
case.


title: WMAPping inflationary physics

abstract:
  We extract parameters relevant for distinguishing among single-field
inflation models from the Wilkinson Microwave Anisotropy Probe (WMAP) data set,
and from a combination of the WMAP data and seven other Cosmic Microwave
Background (CMB) experiments. We use only CMB data and perform a likelihood
analysis over a grid of models including the full error covariance matrix. We
find that a model with a scale-invariant scalar power spectrum ($n=1$), no
tensor contribution, and no running of the spectral index, is within the
1-$\sigma$ contours of both data sets. We then apply the Monte Carlo
reconstruction technique to both data sets to generate an ensemble of
inflationary potentials consistent with observations. None of the three basic
classes of inflation models (small-field, large-field, and hybrid) are
completely ruled out, although hybrid models are favored by the best-fit
region. The reconstruction process indicates that a wide variety of smooth
potentials for the inflaton are consistent with the data, implying that the
first-year WMAP result is still too crude to constrain significantly either the
height or the shape of the inflaton potential. In particular, the lack of
evidence for tensor fluctuations makes it impossible to constrain the energy
scale of inflation. Nonetheless, the data rule out a large portion of the
available parameter space for inflation. For instance, we find that potentials
of the form $V = \lambda \phi^4$ are ruled out to $3\sigma$ by the combined
data set, but not by the WMAP data taken alone.


title: An effective theory for Leptogenesis

abstract:
  The effective Lagrangian for the seesaw model is derived. Besides the usual
dimension-5 operator responsible for light neutrino masses, a dimension-6
operator is included which, for three or less heavy neutrino generations,
provides a generic link between low-energy observables and all physical
parameters of the high-energy seesaw Lagrangian. Leptogenesis can be then
confirmed or ruled out through the measurement of neutrino masses and mixings
and the exotic neutrino couplings originated from the dimension-6 operator.


title: One-Loop Helicity Amplitudes for Parton Level Virtual Compton Scattering

abstract:
  We calculate the one-loop QCD virtual corrections to all helicity amplitudes
for parton level virtual Compton scattering processes. We include the
amplitudes both on quark target process $\gamma^* q\to\gamma q$ and on gluon
target process $\gamma^*g\to\gamma g$. The infrared pole structure of the
amplitudes is in agreement with the prediction of Catani's general formalism
for the singularities of one-loop amplitudes, while expressions for the finite
remainder are given in terms of logarithms and dilogarithms that are real in
the physical region.


title: On theory of Landau-Pomeranchuk-Migdal effect

abstract:
  The cross section of bremsstrahlung from high-energy electron suppressed due
to the multiple scattering of an emitting electron in a dense media (the LPM
effect) is discussed. Development of the LPM effect theory is outlined. For the
target of finite thickness one has to include boundary photon radiation as well
as the interference effects. The importance of multiphoton effects is
emphasized. Comparison of theory with SLAC data is presented.


title: MSSM curvaton in the gauge-mediated SUSY breaking

abstract:
  We study the curvaton scenario using the MSSM flat directions in the
gauge-mediated SUSY breaking model. We find that the fluctuations in the both
radial and phase directions can be responsible for the density perturbations in
the universe through the curvaton mechanism. Although it has been considered
difficult to have a successful curvaton scenario with the use of those flat
directions, it is overcome by taking account of the finite temperature effects,
which induce a negative thermal logarithmic term in the effective potential of
the flat direction.


title: Theoretical status of the muon g-2

abstract:
  We review the present status of the theoretical evaluation of the anomalous
magnetic moment of the the muon within the Standard Model. We mainly focus on
the hadronic contributions in the muon g-2 due to vacuum polarization effects,
light-by-light scattering and higher order electroweak corrections. We discuss
some recent calculations together with their uncertainties and limitations and
point out possible improvements in the future. In view of the inconsistent
values for the hadronic vacuum polarization based on e^+ e^- and tau data, no
conclusion can be drawn yet, whether the apparent discrepancy between the
current experimental and theoretical values for the muon g-2 points to physics
beyond the Standard Model.


title:
Cellular Approach to Long-Range $p_t$ and Multiplicity Correlations in
  the String Fusion Model

abstract:
  The long-range $p_t$ and multiplicity($n$) correlations in high-energy
nuclear collisions are studied in the framework of a simple cellular analog of
the string fusion model.
  Two cases with local and global string fusion is considered. The $p_t$--$n$
and $n$--$n$ correlation functions and correlation coefficients are calculated
analytically in some asymptotic cases using suggested Gauss approximation.
  It's shown that at large string density the $p_t$--$n$ and $n$--$n$
correlation coefficients are connected and the scaling takes place. The
behavior of the correlations at small string density is also studied.
  The asymptotic results are compared with results of the numerical
calculations in the framework of proposed cellular approach.


title:
QCD Corrections to Electroweak Vector Boson Scattering at Small
  Scattering Angles

abstract:
  We investigate the role of a certain class of QCD corrections to electroweak
vector boson scattering at small scattering angles and large energies. These
are present since, from the perturbative analysis, the vector bosons may
dissociate into quark-antiquark pairs giving rise to colour dipoles interacting
through gluon exchanges. After the computation of the vector boson impact
factors, we present expressions for the lowest order QCD scattering amplitude
and for the leading logarithmic BFKL amplitude. Particularly we discuss
numerical results for the process $\gamma\gamma\to ZZ$. The QCD corrections to
the cross section resulting from the interference with the electroweak ones are
estimated and compared with the leading pure electroweak part. Corrections
resulting from the leading log BFKL amplitude are of the order of few percent
already at the $0.5 - 1$ TeV energy range.


title: Lepton flavor violating decays and quasi-degenerate neutrinos

abstract:
  We show that the predictions for lepton flavor violating decays, in the case
of quasi-degenerate neutrinos, change drastically when we include in the
computation the high-energy phases present in the matrix of neutrino Yukawa
couplings.


title: Status of Neutrino Fits

abstract:
  I review the current status of solar, KamLAND, atmospheric and K2K neutrino
experiments, implications for three-neutrino mixing and upper bounds for the
neutrino masses.


title: Understanding $D_{sJ}(2317)$

abstract:
  We analyze the hadronic and radiative decay modes of the recently observed
$D_{sJ}(2317)$ meson, in the hypothesis that it can be identifield with the
scalar $s_\ell^P={1\over 2}^+$ state of $c \bar s$ spectrum ($D_{s0}$). The
method is based on heavy quark symmetries and Vector Meson Dominance ansatz. We
find that the hadronic isospin violating mode $D_{s0} \to D_s \pi^0$ is
enhanced with respect to the radiative mode $D_{s0} \to D_s^* \gamma$. The
estimated width of the meson is
  $\Gamma(D_{s0})\simeq 7$ KeV.


title: Neutrinos in Extra Dimensions and Supernovae

abstract:
  Models with extra space dimensions naturally provide for the existence of
fermions that propagate in them. These are seen in 4D as an infinite tower of
sterile neutrinos possibly mixed with the Standard Model ones. We consider the
effect of such a mixing in the context of core collapse supernova physics. We
show that the potentially dramatic modifications to the supernova evolution
(commonly believed to set very strong bounds on the parameters of the extra
dimensions) are prevented by a mechanism of feedback, so that much weaker
bounds need to be imposed. Nevertheless, the supernova core evolution is
significantly modified. We discuss the compatibility with the SN1987a signal
and we analyse the distinctive signatures of the neutrino signal on Earth.


title:
Analytical Result for Dimensionally Regularized Massless On-Shell Planar
  Triple Box

abstract:
  The dimensionally regularized massless on-shell planar triple box Feynman
diagram with powers of propagators equal to one is analytically evaluated for
general values of the Mandelstam variables s and t in a Laurent expansion in
the parameter \ep=(4-d)/2 of dimensional regularization up to a finite part. An
explicit result is expressed in terms of harmonic polylogarithms, with
parameters 0 and 1, up to the sixth order. The evaluation is based on the
method of Feynman parameters and multiple Mellin-Barnes representation. The
same technique can be quite similarly applied to planar triple boxes with any
numerators and integer powers of the propagators.


title:
Theoretical Overview on (Hidden) Charm in High-Energy Heavy-Ion
  Collisions

abstract:
  Recent developments in the theoretical evaluation of charmonium production in
ultrarelativistic heavy-ion collisions (URHIC's) are discussed. In particular,
the consequences of equilibrium properties of open and hidden charm states --
accessible, {\it e.g.}, in QCD lattice gauge calculations -- are assessed.
These include abundances as well as formation and dissociation rates of
charmonia in both hadronic and quark-gluon matter.


title:
A comment on "weak phase $\gamma$ using isospin analysis and
  time-dependent asymmetry in $B^0\to K_S\pi^+\pi^-"

abstract:
  We comment on a recent suggestion for measuring $\gamma$ in $B^0(t)\to
K_S\pi^+\pi^-$. A difficulty is pointed out in relating electroweak penguin and
tree amplitudes in $B^+\to K^0\pi^+\pi^0$, which is crucial for an
implementation of this method. We clarify the necessary condition for such a
relation.


title: Final State Interactions in Kaon Decays Revisited

abstract:
  We examine effects of final state interactions (FSI) in kaon decays using a
new scheme without the Omnes function, and show that while Delta I=1/2 rule is
impossible to be explained in terms of FSI alone, $\epsilon'/\epsilon\sim
16.5\times 10^{-4}$ is obtained through FSI, if the calculation is concerned
only with the CP-violating parts. The pi-pi contribution to the m_L-m_S mass
difference is shown to be about 0.14, if the sizes of the CP conserving
amplitudes A_0 and A_2 are correctly given.


title: Puzzling out Neutrino Mixing Through Golden and Silver Measurements

abstract:
  We update a recent work devoted to resolve the degeneracies that appear in
the simultaneous extraction of $\theta_{13}$ and $\delta$ at future Neutrino
Factories (NF, that exploit the \emph{golden} channels, i.e. $\nu_e\to\nu_\mu$
($\bar{\nu}_e\to\bar{\nu}_\mu$)) and Superbeam experiments (SB, that measure
the $\nu_\mu\to\nu_e$ ($\bar{\nu}_\mu\to\bar{\nu}_e$) transitions). We consider
the neutrino fluxes obtained with a new optics design for the CERN-SPL SB and
assume the solar parameters within the LMA-I and the LMA-II regions indicated
by recent KamLAND data. The dangerous fake solution associated with the
$\theta_{23}$-ambiguity remains after the combination of data from these two
facilities: in this perspective, we analyze the impact of the NF-\emph{silver}
channels, i.e. $\nu_e\to\nu_\tau$ ($\bar{\nu}_e\to\bar{\nu}_\tau$). The
combination of data from these three experiments -NF(\emph{golden} and
\emph{silver} channels) plus SPL SB- can discover leptonic CP violation for
values of $\theta_{13}\ge 1^{\circ}$.


title: Evolution of Randall-Sundrum Black Holes in Dense Media

abstract:
  In the framework of Randall-Sundrum model, we discuss the evolution of
microscopic black holes created by cosmic particles hitting a neutron or a
strange star. We set up the general equations of evolution for the black hole
mass and momentum in a dense medium, and discuss the possibility of collapse
due to the black hole's growth inside the star.


title: Azimuthal Correlation in Dihadron Production

abstract:
  We study the azimuthal correlation of hadron pairs produced in hadron-hadron
collisions in the framework of perturbative QCD. We concentrate our attention
on the `almost back-to-back' region where resummation of large logarithms due
to soft and/or collinear radiation are shown to play an important role. Our aim
is to perform perturbative resummation at single logarithmic accuracy.


title: Quark droplets stability induced by external magnetic field

abstract:
  The influence of a constant homogeneous external magnetic field $H$ on the
formation and stability of quark droplets is investigated within a simple Nambu
-- Jona-Lasinio model by using a thermodynamic approach. For a vanishing
magnetic field stable quark droplets, which are schematically the bags of
massless quarks, are allowed to exist only at $G>G_{bag}$, where $G$ is the
quark coupling constant, $G_{bag}=1.37G_{crit}$, and $G_{crit}$ is the value of
the coupling constant above which chiral symmetry is spontaneously broken down.
On the other hand, a nonvanishing external magnetic field can induce the
stability of quark droplets so that they may exist even at $G<G_{bag}$. In this
case, depending on the value of $H$, quark droplets are composed either of
massive or massless quarks.


title: QCD Saturation in the Semi-classical Approach

abstract:
  In this paper the semi-classical approach to the solution of non-linear
evolution equation is developed. We found the solution in the entire kinematic
region to the non-linear evolution equation that governs the dynamics in the
high parton density QCD. The large impact parameter ($b_t$) behavior of the
solution is discussed as well as the way how to include the non-perturbative
QCD corrections in this region of $b_t$. The geometrical scaling behavior and
other properties of the solution in the saturation (Color Glass Condensate)
kinematic domain are analyzed. We obtain the asymptotic behavior for the
physical observables and found the unitarity bounds for them.


title: Pion Gas Viscosity

abstract:
  We briefly report a calculation of the viscosity of a pion gas at finite
temperature and chemical potential using three different models for the
pion-pion interaction. The results for the Inverse Amplitude Method
interpolation yield a viscosity of order (m_pi^3) up to temperatures of order
m_pi. The calculation is performed within the kinetic theory of gases, by
approximately solving the Uehling-Uhlenbeck equation with relativistic
kinematics.


title: Atmospheric Neutrino Oscillations, theta(13) and Neutrino Mass Hierarchy

abstract:
  We derive predictions for the Nadir angle (theta(n)) dependence of the ratio
N(mu)/N(e) of the rates of the mu-like and e-like multi-GeV events measured in
water-Cerenkov detectors in the case of 3-neutrino oscillations of the
atmospheric nu(e) (antinu(e)) and nu(mu) (antinu(mu)), driven by one neutrino
mass squared difference, |Delta m2(31)| ~ (2.5 - 3.0) x 10^(-3) eV^2 >> Delta
m2(21). This ratio is particularly sensitive to the Earth matter effects in the
atmospheric neutrino oscillations, and thus to the values of sin^2(theta(13))
and sin^2(theta(23)), theta(13) and theta(23) being the neutrino mixing angle
limited by the CHOOZ and Palo Verde experiments and that responsible for the
dominant atmospheric nu(mu) -> nu(tau) (antinu(mu) -> antinu(tau))
oscillations. It is also sensitive to the type of neutrino mass spectrum which
can be with normal (Delta m2(31) > 0) or with inverted (Delta m2(31) < 0)
hierarchy. We show that for sin^2(theta(13)) > 0.01, sin^2(theta(23)) > 0.5 and
at cos(theta(n)) > 0.4, the Earth matter effects modify substantially the
theta(n)-dependence of the ratio N(mu)/N(e) and in a way which cannot be
reproduced with sin^2(theta(13)) = 0 and a different value of sin^2(theta(23)).
For normal hierarchy the effects can be as large as ~ 25% for cos(theta(n)) ~
(0.5 - 0.8), can reach ~ 35% in the Earth core bin cos(theta(n)) ~ (0.84 -
1.0), and might be observable. They are typically by ~ 10% smaller in the
inverted hierarchy case. An observation of the Earth matter effects in the
Nadir angle distribution of the ratio N(mu)/N(e) would clearly indicate that
sin^2(theta(13)) > 0.01 and sin^2(theta(23)) > 0.50.


title:
The investigation of the gamma-gamma->WW including electromagnetic
  corrections at the TESLA kinematics

abstract:
  The WW production in gamma-gamma scattering is considered in the Standard
Model. The main contribution to radiative effects for the process
gamma-gamma->WW has been calculating and analyzing. It is found the latter is
considerable at high energies and greatly contributes to the differential cross
section $d\sigma$ at various polarizations of initial photons and final bosons.
Monte-Carlo generator built based on TESLA kinematics.


title: K_{l3} and pi_{e3} decays: radiative corrections and CKM unitarity

abstract:
  We discuss radiative corrections to K_{e3} and pi_{e3} decays within chiral
perturbation theory with virtual photons and leptons. We then present the
extraction of the CKM elements V_{us} and V_{ud} using the presently available
experimental input. Finally, we discus the test of CKM unitarity based on the
present independent knowledge of V_{ud} and V_{us}, and describe the prospects
of improvement with the upcoming B.R. measurements.


title:
Gaugino-induced quark and lepton masses in a truly minimal left-right
  model

abstract:
  It has recently been proposed that all fundamental fermion masses (whether
Dirac or Majorana) come from effective dimension-five operators in the context
of a truly minimal left-right model. We show how a particularly economical
scheme emerges in a supersymmetric framework, where chiral symmetry breaking
originates in the gaugino sector.


title: Vorton Existence and Stability

abstract:
  We present the first concrete evidence for the classical stability of
vortons, circular cosmic string loops stabilized by the angular momentum of the
charge and current trapped on the string. We begin by summarizing what is known
about vorton solutions and, in particular, their analytic stability with
respect to a range of radial and nonradial perturbations. We then discuss
numerical results of vorton simulations in a full 3D field theory, that is,
Witten's original bosonic superconducting string model with a modified
potential term. For specific parameter values, these simulations demonstrate
the long-term stability of sufficiently large vorton solutions created with an
elliptical initial ansatz.


title: Electroweak Precision Tests of Little Higgs Theories

abstract:
  Little Higgs theories are a fascinating new idea to solve the little
hierarchy problem by stabilizing the Higgs mass against one-loop quadratically
divergent radiative corrections. In this talk I give a brief overview of the
idea, focusing mainly on the littlest Higgs model, and present a sampling of
the electroweak precision constraints.


title: A theoretical case for negative mass-square for sub-eV particles

abstract:
  Electroweak gauge bosons have masses of the order of 10^2 GeV, while masses
of additional bosons involved in gravito-electroweak unification are expected
to be still higher. These are at least eleven orders of magnitude higher than
sub-eV range indications for neutrino masses. Under these circumstances we
suspect that the sub-eV particles are created in a spacetime where
gravitational effects of massive gauge bosons may become important. The
question that we thus ask is: What is the spacetime group around a
gravito-electroweak vertex? Modeling it as de-Sitter we find that sub-eV
particles may carry a negative mass square of the order of - (3/8 \pi^3)
(M_unif./M_Planck)^4 M_Planck^2.
  Neutrino oscillation data then hints at 30-75 TeV scale for M_unif., where
M_unif. characterizes gravito-electroweak unification scale.


title:
A road map to solar neutrino fluxes, neutrino oscillation parameters,
  and tests for new physics

abstract:
  We analyze all available solar and related reactor neutrino experiments, as
well as simulated future 7Be, p-p, pep, and ^8B solar neutrino experiments. We
treat all solar neutrino fluxes as free parameters subject to the condition
that the total luminosity represented by the neutrinos equals the observed
solar luminosity (the `luminosity constraint'). Existing experiments show that
the p-p solar neutrino flux is 1.02 +- 0.02 (1 sigma) times the flux predicted
by the BP00 standard solar model; the 7Be neutrino flux is 0.93^{+0.25}_{-0.63}
the predicted flux; and the ^8B flux is 1.01 +- 0.04 the predicted flux. The
neutrino oscillation parameters are: Delta m^2 = 7.3^{+0.4}_{-0.6}\times
10^{-5} eV^2 and tan^2 theta_{12} = 0.41 +- 0.04. We evaluate how accurate
future experiments must be to determine more precisely neutrino oscillation
parameters and solar neutrino fluxes, and to elucidate the transition from
vacuum-dominated to matter-dominated oscillations at low energies. A future 7Be
nu-e scattering experiment accurate to +- 10 % can reduce the uncertainty in
the experimentally determined 7Be neutrino flux by a factor of four and the
uncertainty in the p-p neutrino flux by a factor of 2.5 (to +- 0.8 %). A future
p-p experiment must be accurate to better than +- 3 % to shrink the uncertainty
in tan^2 theta_{12} by more than 15 %. The idea that the Sun shines because of
nuclear fusion reactions can be tested accurately by comparing the observed
photon luminosity of the Sun with the luminosity inferred from measurements of
solar neutrino fluxes. Based upon quantitative analyses of present and
simulated future experiments, we answer the question: Why perform low-energy
solar neutrino experiments?


title:
Jet fragmentation due to a quark/diquark pick-up in high energy heavy
  ion collisions

abstract:
  We propose a model aimed at explaining jet quenching, large azimuthal
asymmetry and baryon/meson ratio at large transverse momenta pt=2-10 GeV
observed at RHIC. Its main point is that a QCD string can be cut by matter
quarks and/or diquarks before its natural breaking. We model the early
quark/diquark production via QCD sphalerons.


title: QCD Factorization and Re-scattering in Proton-Nucleus Collisions

abstract:
  The extension of the factorization theorems of perturbative QCD to power
corrections associated with re-scattering in nuclear collisions is reviewed.
The importance of hadron-nucleus collisions is discussed.


title: Two novel possibilities in Higgs phenomenology

abstract:
  We discuss two novel possibilities in Higgs physics. The first is that, by
adding a real Higgs triplet to the Standard Model, it is possible for the
lightest Higgs boson to be as heavy as 500 GeV without any fine tuning. The
second, somewhat orthogonal, possibility concerns the MSSM with explicit CP
violation. This model is known to permit a light Higgs boson with mass below 50
GeV which may have avoided detection at LEP and may also avoid detection at the
Tevatron and LHC. We suggest that diffraction may provide the key to excluding
or observing such a Higgs.


title: Automated resummation of final state observables in QCD

abstract:
  We present an innovative method to resum infrared and collinear logarithms
appearing in distributions of jet observables in QCD. The method, based on a
general master formula with applicability conditions, allows resummations at
next-to-leading logarithmic accuracy in an automated way. As a sample
application we present resummed results in hadronic dijet events.


title: CP-Violating Asymmetries in K^+ -> 3 pi in the Standard Model

abstract:
  We update the CP-violating asymmetries in K^+ -> 3 pi. In particular we study
Delta g_C and Delta g_N -the asymmetries in the slope g. We emphasize its
complementarity to the direct CP-violation parameter epsilon_K' and the large
sensitivity to the size of the imaginary part of the octet coupling Im G_8 at
lowest order in CHPT. We also give the prospects of a full calculation at
next-to-leading order of this and other CP-violating asymmetries which will be
presented elsewhere.


title: The rise and fall of F_2 at low x

abstract:
  A short personal account is given of the impact of HERA data and the
influence of Jan Kwiecinski on low x physics


title: Model for neutrino mixing based on SO(10)

abstract:
  Assuming grand unified theory (GUT) and supersymmetry, we propose a simple
model which can consistently accommodate the masses and mixings for quarks and
leptons. The grand unified group is SO(10), and $\bf 10$, $\bf 120$, and $\bar
{\bf 126}$ representations are introduced for the Higgs superfields which give
masses to the quarks and leptons. The differences of masses and mixings between
the quarks and the leptons are attributed to the Higgs boson structure. Below
the GUT energy scale, the model is the same as the minimal supersymmetric
standard model except its inclusion of dimension-5 operators for the small
neutrino masses. The renormalization group equations of the independent
parameters for the Higgs couplings with the quarks and leptons are given
explicitly to connect the two energy scales of GUT and electroweak theory.


title: Strange Mesons in Kaluza-Klein Picture

abstract:
  We have performed an analysis of experimental data on mass spectrum of the
resonance states containing strange mesons and compared them with the
calculated values provided by Kaluza-Klein scenario. In this note we present
the results of this analysis.


title: Neutrino Mixing and the Minimal 3-3-1 Model

abstract:
  In the minimal 3-3-1 model charged leptons come in a non-diagonal basis.
Moreover the Yukawa interactions of the model lead to a non-hermitian charged
lepton mass matrix. In other words, the minimal 3-3-1 model presents a very
complex lepton mixing. In view of this we check rigorously if the possible
textures of the lepton mass matrices allowed by the minimal 3-3-1 model can
lead or not to the neutrino mixing required by the recent experiments in
neutrino oscillation.


title: Phenomenological implication of KamLAND on lepton mass matrices

abstract:
  By using a model independent Monte Carlo approach, we study the possible
structure of charged and neutral lepton mass matrices, under the assumption of
an U(2) horizontal symmetry (additional to the usual Standard Model ones)
involving the light fermion generations. We assume the most general Majorana
mass matrix for neutrinos. We update the results of our previous similar study,
by inserting in the analysis the recent KamLAND data, that contributed to find
a final solution to the Solar neutrino problem. The introduction of the new
experimental data reduce the allowed regions in the nine dimensional space
parameters, and show that our procedure gives stable solutions.


title:
In Medium modifications to rho from finite pion density effects and
  dilepton spectrum

abstract:
  The behavior of the pion dispersion relation in a pion medium is strongly
modified by the introduction of a finite chemical potential associated to the
finite pion number density. Such behavior is particularly important during the
hadronic phase of a relativistic heavy-ion collision, between chemical and
thermal freeze-out, where the pion number changing processes, driven by the
strong interaction, can be considered to be frozen. We make use of an effective
Lagrangian that explicitly respects chiral symmetry through the enforcement of
the chiral Ward identities. The pion dispersion relation is computed through
the computation of the pion self-energy in a non-perturbative fashion by giving
an approximate solution to the Schwinger-Dyson equation for this self-energy.
Given the strong coupling between rho vectors and pions, we argue that the
modification of the pion mass due to finite pion density effects has to be
taken into account self-consistently for the description of the in-medium
modifications of rho's. We finally study some possible consequences of finite
pion density effects for the low-mass dilepton spectrum produced in
relativistic heavy-ion collisions.


title: Evolution at small x

abstract:
  At present there is no correct theory of evolution of F_2(x,Q^2) at small x.
It is a mixture of hard and soft pomeron exchange and perturbative QCD very
successfully describes the evolution of the hard-pomeron component. This allows
the gluon density to be calculated. It is somewhat different from what is
conventionally supposed, but it leads to a clean PQCD description of the data
for the charm structure function. Perturbative QCD breaks down for the
evolution of the soft-pomeron component of F_2(x,Q^2).


title: Anomalous 3-jet and Heavy Quark Fragmentation

abstract:
  Heavy hadron production in $e^+e^-$ annihilation is studied in the framework
of heavy-quark recombination mechanism. This mechanism predicts a new type of
3-jet event such as $b\bar{b}q$ or $b\bar{b}\bar{q}$, which is power-suppressed
relative to the standard $b\bar{b}g$ event. Furthermore, heavy quark
fragmentation function also receives a contribution from this mechanism, which
is {\it calculable} in perturbative QCD as long as the momentum fraction $z$ is
not too close to unity. We conjecture that the height of the peak of
fragmentation function for S-wave heavy hadron scales as $\alpha_s^2(m)
m/\lambdaqcd$.


title:
Charge Neutrality of the Color-Flavor Locked Phase from the Low Energy
  Effective Theory

abstract:
  We investigate the issue of charge neutrality of the CFL$K^0$ phase of dense
quark matter using the low energy effective theory of high density QCD. We show
that the local electric and color charge neutrality of the ground state in a
homogeneous color superconducting medium follows from its dynamics. We also
consider the situation of a spatially inhomogeneous medium, such as may be
found in a neutron star core. We find that spatial inhomogeneity results in the
generation of electric fields, and positrons/electrons may be present in the
ground state. We estimate the concentration of charged leptons in the ground
state to be $n_{e}\sim{10^2}{cm}^{-3}$ and consider their influence on the
opacity of the medium with respect to the modified photons.


title: J/Psi Propagation in Hadronic Matter

abstract:
  We study J/$\psi$ propagation in hot hadronic matter using a four-flavor
chiral Lagrangian to model the dynamics and using QCD sum rules to model the
finite size effects manifested in vertex interactions through form factors.
Charmonium breakup due to scattering with light mesons is the primary
impediment to continued propagation. Breakup rates introduce nontrivial
temperature and momentum dependence into the J/$\psi$ spectral function.


title: Exact Matter-Covariant Formulation of Neutrino Oscillation Probabilities

abstract:
  We write the probabilities for neutrino oscillations in uniform-density
matter exactly in terms of convention-independent vacuum neutrino oscillation
parameters and the matter density. This extends earlier results formulating
neutrino oscillations in terms of matter-, phase-, and trace-invariant
quantities.


title:
Energy Scan Program at the Cern SPS and An Observation of the
  Deconfinement Phase Transition in Nucleus--Nucleus Collisions

abstract:
  The history and the main results of the energy scan program at the CERN SPS
are reviewed. Several anomalies in energy dependence of hadron production
predicted as signals of deconfinement phase transition are observed and they
indicate that the onset of deconfinement is located at about 30 A GeV. For the
first time we seem to have clear evidence for the existence of a deconfined
state of matter in nature.


title: Diffractive Production of the Higgs Boson

abstract:
  Diffractive production of the Higgs boson at hadron colliders is discussed in
the light of the observed rate of hard diffractive dijet events at the
Tevatron. The Higgs predictions of models successful for dijets are compared.
LHC seems promising for a diffractive light Higgs boson and its mass
determination. Hard diffractive dijets, diphotons and dileptons at the Tevatron
(Run II) will be necessary to remove the remaining large uncertainties on
cross-sections and signals.


title:
Fine and Hyperfine Splittings of Charmonium and Bottomonium: An Improved
  Perturbative QCD Approach

abstract:
  We extend the formalism based on perturbative QCD that was developed in our
previous work, and compute the hyperfine splittings of the bottomonium spectrum
as well as the fine and hyperfine splittings of the charmonium spectrum. All
the corrections up to O(alpha_s^5 m) are included in the computations. We find
agreement (with respect to theoretical uncertainties) with the experimental
values whenever available and give predictions for not yet observed splittings.


title:
Exponentiation of the Drell-Yan cross section near partonic threshold in
  the DIS and MSbar schemes

abstract:
  It has been observed that in the DIS scheme the refactorization of the
Drell-Yan cross section leading to exponentiation of threshold logarithms can
also be used to organize a class of constant terms, most of which arise from
the ratio of the timelike Sudakov form factor to its spacelike counterpart. We
extend this exponentiation to include all constant terms, and demonstrate how a
similar organization may be achieved in the MSbar scheme. We study the
relevance of these exponentiations in a two-loop analysis.


title: Accounting for Slow J/psi from B Decay

abstract:
  A slow J/psi excess exists in the inclusive B -> J/psi+X spectrum, and is
indicative of some hadronic effect. From color octet nature of c cbar pair in
b-> c cbar s decay, one such possibility would be B -> J/psi+ K_g decay, where
K_g is a hybrid resonance with sbar g q constituents. We show that a K_g
resonance of ~ 2 GeV mass and suitably broad width could be behind the excess.


title: Long distance chiral corrections in B meson amplitudes

abstract:
  We discuss the chiral corrections to f_B and B_B with particular emphasis on
determining the portion of the correction that arises from long distance
physics. For very small pion and kaon masses all of the usual corrections are
truly long distance, while for larger masses the long distance portion
decreases. These chiral corrections have been used to extrapolate lattice
calculations towards the physical region of lighter masses. We show in
particular that the chiral extrapolation is better behaved if only the long
distance portion of the correction is used.


title: Quark Probability Distribution at Finite Temperature and Density

abstract:
  Quark deconfinement phase transition at finite temperature and density is
investigated in the frame of quantum mechanics. By solving the Schr\"odinger
equation for a heavy quark in a thermal mean field, we calculate the quark
probability distribution as a function of temperature and density. The confined
wave function in the vacuum expands outward rapidly when the temperature and
density are high enough. The obtained phase transition line agrees
qualitatively with the result of lattice QCD.


title: The pressure of QCD at finite temperatures and chemical potentials

abstract:
  The perturbative expansion of the pressure of hot QCD is computed here to
order g^6ln(g) in the presence of finite quark chemical potentials. In this
process all two- and three-loop one-particle irreducible vacuum diagrams of the
theory are evaluated at arbitrary T and mu, and these results are then used to
analytically verify the outcome of an old order g^4 calculation of Freedman and
McLerran for the zero-temperature pressure. The results for the pressure and
the different quark number susceptibilities at high T are compared with recent
lattice simulations showing excellent agreement especially for the chemical
potential dependent part of the pressure.


title:
New Polarization Operator Contributions to Lamb Shift and Hyperfine
  Splitting

abstract:
  We calculate radiative corrections to the Lamb shift of order
$\alpha^3(Z\alpha)^5m$ and radiative corrections to hyperfine splitting of
order $\alpha^3(Z\alpha)E_F$ generated by the diagrams with insertions of
radiative photons and electron polarization loops in the graphs with two
external photons. We also obtain the radiative-recoil correction to hyperfine
splitting in muonium generated by the diagrams with the $\tau$ polarization
loop.


title: The synergy of the golden and silver channels at the Neutrino Factory

abstract:
  We deepen the study of the so-called ``silver channel'' $\nu_e \to \nu_\tau$
\cite{Donini:2002rm} and of its relevance to solve some of the ambiguities that
can arise in the simultaneous measurement of $(\theta_{13},\delta)$ at the
Neutrino Factory by presenting in full detail the characteristics of the
considered OPERA-like detector and the experimental treatment of the different
backgrounds and signals. Furthermore, we perform a detailed study of the
systematic errors associated both with the OPERA-like and the magnetized-iron
detectors and their effects on the sensitivity. Finally, we also apply a
refined statistical analysis of the simulated events based on the frequentist
approach.


title: Diffractive production of dijets by double Pomeron exchange processes

abstract:
  A phenomenological description of diffractive dijet hadroproduction via
double Pomeron exchange is presented. This description is based on a modified
version of the Ingelman-Schlein model which includes the evolution of the
Pomeron structure function and corrections regarding rapidity gap suppression
effects. The same quark-dominant Pomeron structure function employed in a
previous report to describe diffractive dijet and W production via single
Pomeron processes is shown here to yield results consistent with the available
data for double Pomeron processes as well.


title: Optimal RG-Improvement of Perturbative Calculations in QCD

abstract:
  Using renormalization-group methods, differential equations can be obtained
for the all-orders summation of leading and subsequent non-leading logarithmic
corrections to QCD perturbative series for a number of processes and
correlation functions. For a QCD perturbative series known to four orders, such
as the e+ e- annihilation cross-section, explicit solutions to these equations
are obtained for the summation to all orders in alpha_s of the leading set and
the subsequent two non-leading sets of logarithms. Such summations are shown
for a number of processes to lead to a substantial reduction in sensitivity to
the renormalization scale parameter. Surprisingly, such summations are also
shown to lower the infrared singularity within the perturbative expression for
the e+ e- annihilation cross-section to coincide with the Landau pole of the
naive one-loop running QCD couplant.


title:
Precision Electroweak Data and Unification of Couplings in Warped Extra
  Dimensions

abstract:
  Warped extra dimensions allow a novel way of solving the hierarchy problem,
with all fundamental mass parameters of the theory naturally of the order of
the Planck scale. The observable value of the Higgs vacuum expectation value is
red-shifted, due to the localization of the Higgs field in the extra dimension.
It has been recently observed that, when the gauge fields propagate in the
bulk, unification of the gauge couplings may be achieved. Moreover, the
propagation of fermions in the bulk allows for a simple solution to potentially
dangerous proton decay problems. However, bulk gauge fields and fermions pose a
phenomenological challenge, since they tend to induce large corrections to the
precision electroweak observables. In this article, we study in detail the
effect of gauge and fermion fields propagating in the bulk in the presence of
gauge brane kinetic terms compatible with gauge coupling unification, and we
present ways of obtaining a consistent description of experimental data, while
allowing values of the first Kaluza Klein mode masses of the order of a few
TeV.


title:
Lattice calculations of meson correlators and spectral functions at
  finite temperature

abstract:
  I review recent progress in relating meson spectral function to imaginary
time correlation function at finite temperature calculated on isotropic as well
as on anisotropic lattices. Special attention is payed for the lattice
artifacts present in calculation of meson spectral functions. Results in the
case of light quarks as well as heavy quarks are reviewed which indicate in
particular that even in the chiral limit meson spectral functions have
non-trivial structure and the ground state quarkonia survive up to temperature
1.5T_c


title: Complex conjugate poles and parton distributions

abstract:
  We calculate parton and generalized parton distributions in Minkowski space
using a scalar propagator with a pair of complex conjugate poles. Correct
spectral and support properties are obtained only after careful analytic
continuation from Euclidean space. Alternately the quark distribution function
can be calculated from modified cutting rules, which put the intermediate state
on its complex mass shells. Distribution functions agree with those resulting
from the model's Euclidean space double distribution which we calculate via
non-diagonal matrix elements of twist-two operators. Thus one can use a wide
class of analytic parameterizations of the quark propagator to connect
Euclidean space Green functions to light-cone dominated amplitudes.


title: Direct Detection of Dark Matter in Supersymmetric Models

abstract:
  We evaluate neutralino-nucleon scattering rates in several well-motivated
supersymmetric models, and compare against constraints on the neutralino relic
density, BF( b\to s\gamma ) as well as the muon anomalous magnetic moment a_\mu
. In the mSUGRA model, the indirect constraints favor the hyperbolic
branch/focus point (HB/FP) region of parameter space, and in fact this region
is just where neutralino-nucleon scattering rates are high enough to be
detected in direct dark matter search experiments! In Yukawa unified SUSY
SO(10) models with scalar mass non-universality, the relic density of
neutralinos is almost always above experimental bounds, while the corresponding
direct detection rates are below experimental levels. Conversely, in five
dimensional SO(10) models where gauge symmetry breaking is the result of
compactification of the extra dimension, and supersymmetry breaking is
communicated via gaugino mediation, the relic density is quite low, while
direct detection rates can be substantial.


title: SUSY dark matter --A collider Physicist's Perspective--

abstract:
  A short tour of supersymmetric dark matter and its connection to collider
physics.


title: Study of stop and sbottom at LHC

abstract:
  In supersymmetric models a gluino can decay into $tb\tilde{\chi}^{\pm}_1$
through a stop or a sbottom. The decay chain produces an edge structure in the
$m_{tb}$ distribution. Monte Carlo simulation studies show that the end point
and the edge height would be measured at the CERN LHC by using a sideband
subtraction technique. The stop and sbottom masses as well as their decay
branching ratios are constrained by the measurement. We study interpretations
of the measurement.


title: Exclusive two $\rho ^0$-mesons production in $\gamma\gamma^*$ collision

abstract:
  We give a theoretical description of the L3 Collaboration data on the
cross-section of the exclusive two $\rho$-mesons production in $\gamma\gamma
^*$ collision with large photon virtuality. These data prove the scaling
behaviour of the leading twist generalized distribution amplitude of vector
mesons. They thus prove the relevance of a partonic description of the
exclusive process $\gamma\gamma ^*\to\rho ^0\rho ^0$ at $Q^2\geq 1.2 {\rm
GeV^2}$ and $W\leq 3.0 {\rm GeV}.$


title: Vanishing Effective Mass of the Neutrinoless Double Beta Decay?

abstract:
  We stress that massive neutrinos may be Majorana particles even if the
effective mass of the neutrinoless double beta decay m_ee vanishes. We show
that current neutrino oscillation data do allow m_ee = 0 to hold, if the
Majorana CP-violating phases lie in two specific regions. Strong constraints on
three neutrino masses can then be obtained. We find that the neutrino mass
spectrum performs a normal hierarchy: m_1 < m_2 < m_3. A possible texture of
the neutrino mass matrix is also illustrated under the m_ee = 0 condition.


title: Microscopic Models of Heavy Ion Interactions

abstract:
  An introduction to dynamical microscopic models of hadronic and nuclear
interactions is presented. Special emphasis is put in the relation between
multiparticle production and total cross-section contributions. In heavy ion
collisions, some observables, considered as signals of the production of a
Quark Gluon Plasma (QGP), are studied. It is shown that they can only be
described if final state interactions are introduced. It is argued that the
cross-sections required are too small to drive the system to thermal
equilibrium within the duration time of the final state interaction.


title:
A Note on Transverse Axial Vector and Vector Anomalies in U(1) Gauge
  Theories

abstract:
  The transverse axial vector and vector anomalies in four-dimensional U(1)
gauge theories studied in [10] is reexamined by means of perturbative methods.
The absence of transverse anomalies for both axial vector and vector current is
verified. We also show that the Pauli-Villars regularization and dimensional
regularization give the same result on the transverse anomaly of both axial
vector and vector current.


title: Chiral Symmetry Breaking with Scalar Confinement

abstract:
  Spontaneous chiral symmetry breaking is accepted to occur in low energy
hadronic physics, resulting in the several successful theorems of PCAC. On the
other hand scalar confinement is suggested both by the spectroscopy of hadrons
and by the string picture of confinement. However these two evidences are
apparently conflicting, because chiral symmetry breaking requires a chiral
invariant coupling to the quarks, say a vector coupling like in QCD. Here we
reformulate the coupling of the quarks to the string, and we are able to comply
with chiral symmetry breaking, using scalar confinement. The results are quite
encouraging.


title:
The radiative h^0 (A^0)\to \gamma\gamma decays in the two Higgs doublet
  model

abstract:
  We study the radiative h^0 (A^0)\to \gamma\gamma decays in the framework of
the general two Higgs doublet model, the so-called model III. We estimate the
decay width of the processes at the order of magnitude of 10^{-2} GeV for the
intermediate values of the Yukawa couplings. We observe that the analysis of
the two photon system provide a comprehensive information for the complex
nature of the Yukawa couplings and therefore, the source of the CP violation.


title: Masses and mixing of neutrinos in grand unified SO(10) model

abstract:
  A grand unified model based on SO(10) and supersymmetry is presented to
account for the masses and mixing of the neutrinos observed in experiments.


title:
Decays of Higgs to $b\bar b$, $\tau\bar\tau$ and $c\bar c$ as Signatures
  of Supersymmetry and CP Phases

abstract:
  The branching ratio of the lightest Higgs decay into $b\bar b$,
$\tau\bar\tau$ and $c\bar c$ is sensitive to supersymmetric effects. We include
in this work the effects of CP phases on the Higgs decays. Specifically we
compute the deviation of the CP phase dependent branching ratio from the
standard model result. The analysis includes the full one loop corrections of
fermion masses including CP phases involving the gluino, the chargino and the
neutralino exchanges. The analysis shows that the supersymmetric effects with
CP phases can change the branching ratios by as much as 100% for the lightest
Higgs decay into $b\bar b$ and $\tau\bar\tau$ with similar results holding for
the heavier Higgs decays. A detailed analysis is also given of the effects of
CP phases on the Higgs decays into $c\bar c$. The deviations of $R_{b/\tau}$
and $R_{b/c}$ from the standard model result are investigated as a possible
signature of supersymmetry and CP effects. Thus a measurement of the decays of
the higgs into $b\bar b$, $\tau\bar \tau$ and $c\bar c$ may provide important
clues regarding the existence of supersymmetry and CP phases.


title: Leptogenesis with supersymmetric Higgs triplets in TeV region

abstract:
  The leptogenesis with supersymmetric Higgs triplets is studied in the light
of experimental verification in the TeV region. The lepton number asymmetry
appears just after the inflation via multiscalar coherent evolution of Higgs
triplets and antislepton on a flat manifold. If the Higgs triplet mass terms
dominate over the negative thermal-log term for the Hubble parameter H
comparable to the Higgs triplet mass M_\Delta, the asymmetry is fixed readily
to some significant value by the redshift and rotation of these scalar fields,
providing the sufficient lepton-to-entropy ratio n_L / s \sim 10^-10. This can
be the case even with M_\Delta \sim 1 TeV for the reheating temperature T_R
\sim 10^6 GeV and the mass parameter M / \lambda \sim 10^22 GeV of the
nonrenormalizable superpotential terms relevant for leptogenesis.