title: Gravitational Leptogenesis and Its Signatures in CMB

abstract:
  We study the phenomenologies in astrophysics and particularly in CMB
associated with the gravitational leptogenesis. Our results show that future
CMB polarization experiments, such as PLANCK and CMBpol will make a possible
test on this class of model for leptogenesis.


title: The Electroweak Interactions in the Standard Model and Beyond

abstract:
  We present a concise review of the status of the Standard Model and of the
models of new physics.


title:
The pole structure of the unitary, crossing symmetric low energy
  $\pi\pi$ scattering amplitudes

abstract:
  The pole structure of the low energy $\pi\pi$ scattering amplitudes is
studied using a proper chiral unitarization method combined with crossing
symmetry and the low energy phase shift data. It is found that the $\sigma$
pole position is at $M_\sigma=470\pm 50MeV$, $\Gamma_\sigma=570\pm 50MeV$. The
existence of the virtual state pole in the IJ=20 channel is reconfirmed.
Various threshold parameters are estimated and are found in general in good
agreement with the results obtained from the Roy equation analyses.


title: On the Effective Electron Mass in Magnetar-like Fields

abstract:
  We show, either quantum mechanically or classically, that the variation of
the effective mass induced in a charged particle by the presence of an
ultra-strong electromagnetic field may lead to observable consequences. In
particular, we discuss how this effect may operate on electrons close to the
surface of a magnetar, a neutron star with a super-strong magnetic field of the
order of $10^{11}$ Tesla.


title: $\gamma^* \gamma^*$ Scattering via Secondary Reggeon Exchange in QCD

abstract:
  We summarize the results on the high energy behavior of quark-antiquark
exchange in $\gamma^* \gamma^*$ elastic scattering. The ladder diagrams, summed
in the double logarithmic approximation, provide a perturbative QCD model for
secondary reggeon exchange.


title: Probing CP Violation in Omega->Lambda K->p pi K Decay

abstract:
  The sum of the CP-violating asymmetries A_Omega and A_Lambda in the decay
sequence Omega->Lambda K, Lambda->p pi is presently being measured by the E871
experiment. We evaluate contributions to A_Omega from the standard model and
from possible new physics, and find them to be smaller than the corresponding
contributions to A_Lambda, although not negligibly so. We also show that the
partial-rate asymmetry in Omega->Lambda K is nonvanishing due to final-state
interactions. Taking into account constraints from kaon data, we discuss how
the upcoming result of E871 and future measurements may probe the various
contributions to the observables.


title: Dark Matter and Sparticle Reconstruction at the LHC

abstract:
  The present knowledge of the dark matter discovery and measurement potential
of the LHC is reviewed, in the framework of Supersymmetry with R-parity
conservation.


title: Current correlators in QCD: OPE versus large distance dynamics

abstract:
  We analyse the structure of current-current correlators in coordinate space
in large $N_c$ limit when the corresponding spectral density takes the form of
an infinite sum over hadron poles. The latter are computed in the QCD string
model with quarks at the ends, including the lowest states, for all channels.
The corresponding correlators demonstrate reasonable qualitative agreement with
the lattice data without any additional fits. Different issues concerning the
structure of the short distance OPE are discussed.


title: Genetic Algorithms and Experimental Discrimination of SUSY Models

abstract:
  We introduce genetic algorithms as a means to estimate the accuracy required
to discriminate among different models using experimental observables. We
exemplify the technique in the context of the minimal supersymmetric standard
model. If supersymmetric particles are discovered, models of supersymmetry
breaking will be fit to the observed spectrum and it is beneficial to ask
beforehand: what accuracy is required to always allow the discrimination of two
particular models and which are the most important masses to observe? Each
model predicts a bounded patch in the space of observables once unknown
parameters are scanned over. The questions can be answered by minimising a
"distance" measure between the two hypersurfaces. We construct a distance
measure that scales like a constant fraction of an observable.
  Genetic algorithms, including concepts such as natural selection, fitness and
mutations, provide a solution to the minimisation problem. We illustrate the
efficiency of the method by comparing three different classes of string models
for which the above questions could not be answered with previous techniques.
The required accuracy is in the range accessible to the Large Hadron Collider
(LHC) when combined with a future linear collider (LC) facility. The technique
presented here can be applied to more general classes of models or observables.


title:
Thermalization of gluons in ultrarelativistic heavy ion collisions by
  including three-body interactions in a parton cascade

abstract:
  We develop a new 3+1 dimensional Monte Carlo cascade solving the kinetic
on-shell Boltzmann equations for partons including the inelastic gg <-> ggg
pQCD processes. The back reaction channel is treated -- for the first time --
fully consistently within this scheme. An extended stochastic method is used to
solve the collision integral. The frame dependence and convergency are studied
for a fixed tube with thermal initial conditions. The detailed numerical
analysis shows that the stochastic method is fully covariant and that
convergency is achieved more efficiently than within a standard geometrical
formulation of the collision term, especially for high gluon interaction rates.
The cascade is then applied to simulate parton evolution and to investigate
thermalization of gluons for a central Au+Au collision at RHIC energy. For this
study the initial conditions are assumed to be generated by independent
minijets with p_T > p_0=2 GeV. With that choice it is demonstrated that overall
kinetic equilibration is driven mainly by the inelastic processes and is
achieved on a scale of 1 fm/c. The further evolution of the expanding gluonic
matter in the central region then shows almost an ideal hydrodynamical
behavior. In addition, full chemical equilibration of the gluons follows on a
longer timescale of about 3 fm/c.


title: An Introduction to the Brane World

abstract:
  The study of the so called brane world models has introduced completely new
ways of looking up on standard problems in many areas of theoretical physics.
Inspired in the recent developments of string theory, the Brane World picture
involves the introduction of new extra dimensions beyond the four we see, which
could either be compact or even open (infinite). The sole existence of those
new dimensions may have non trivial observable effects in short distance
gravity experiments, as well as in our understanding of the cosmology of the
early Universe, among many other issues. The goal of the present notes is to
provide a short introduction to some basic aspects of the Brane World models.
The discussion includes models with flat compact extra dimensions, as well as
the so called Randall-Sundrum models.


title: Are solar neutrino oscillations robust?

abstract:
  The robustness of the large mixing angle (LMA) oscillation (OSC)
interpretation of the solar neutrino data is considered in a more general
framework where non-standard neutrino interactions (NSI) are present. Such
interactions may be regarded as a generic feature of models of neutrino mass.
The 766.3 ton-yr data sample of the KamLAND collaboration are included in the
analysis, paying attention to the background from the reaction ^13C(\alpha,n)
^16O. Similarly, the latest solar neutrino fluxes from the SNO collaboration
are included. In addition to the solution which holds in the absence of NSI
(LMA-I) there is a 'dark-side' solution (LMA-D) with sin^2 theta_Sol = 0.70,
essentially degenerate with the former, and another light-side solution (LMA-0)
allowed only at 97% CL. More precise KamLAND reactor measurements will not
resolve the ambiguity in the determination of the solar neutrino mixing angle
theta_Sol, as they are expected to constrain mainly Delta m^2. We comment on
the complementary role of atmospheric, laboratory (e.g. CHARM) and future solar
neutrino experiments in lifting the degeneracy between the LMA-I and LMA-D
solutions. In particular, we show how the LMA-D solution induced by the
simplest NSI between neutrinos and down-type-quarks-only is in conflict with
the combination of current atmospheric data and data of the CHARM experiment.
We also mention that establishing the issue of robustness of the oscillation
picture in the most general case will require further experiments, such as
those involving low energy solar neutrinos.


title: Dark Matter and the Baryon Asymmetry of the Universe

abstract:
  We present a mechanism to generate the baryon asymmetry of the Universe which
preserves the net baryon number created in the Big Bang. If dark matter
particles carry baryon number $B_X$, and $\sigma^{\rm annih}_{\bar{X}} <
\sigma^{\rm annih}_{X} $, the $\bar{X}$'s freeze out at a higher temperature
and have a larger relic density than $X$'s. If $m_X \lsi 4.5 B_X $GeV and the
annihilation cross sections differ by $\gsi 10%$, this type of scenario
naturally explains the observed $\Omega_{DM} \approx 5 \Omega_b$.


title: Topological charge screening and pseudoscalar glueballs

abstract:
  Topological charge screening in the QCD vacuum is found to provide crucial
nonperturbative contributions to the short-distance expansion of the
pseudoscalar (0^{-+}) glueball correlator. The screening contributions enter
the Wilson coefficients and are an indispensable complement to the direct
instanton contributions. They restore consistency with the anomalous axial Ward
identity and remedy several flaws in the 0^{-+} glueball sum rules caused by
direct instantons in the absence of screening (lack of resonance signals,
violation of the positivity bound and of the underlying low-energy theorem).
The impact of realistic instanton size distributions and the (gauge-invariant)
renormalization of the instanton contributions are also discussed. Predictions
for the 0^{-+} glueball mass and decay constant are presented.


title: Gauge dilution in leptogenesis

abstract:
  We discuss leptogenesis in its natural context, i.e. gauge unification, by
including in the analysis the effects of the gauge sector associated to the
Majorana neutrinos. It results in stricter bounds on the minimal Majorana mass,
depending on the gauge bosons mass, but also prevents to deduce any lower limit
on the Yukawa couplings since thermal and re-heating scenarios are now
indistinguishable.


title: Vacuum pressures and energy in a strong magnetic field

abstract:
  We study vacuum in a strong magnetic field. It shows a nonlinear response, as
a ferromagnetic medium. Anisotropic pressures arise, and a negative pressure is
exerted in the direction perpendicular to the field. The analogy of this effect
with the Casimir effect is analyzed. The vacuum transverse pressure is found to
be of the same order of the statistical pressure for $B\sim10^{15}G$ and
$N\sim10^{33}electrons/cm^{3}$. Vacuum interaction with the field is studied
also for $B\sim10^{16}G$ and larger, including the electron anomalous magnetic
moment. We estimate quark contribution to vacuum behavior.


title: Higgsless W Unitarity from Decoupling Deconstruction

abstract:
  Recently there has been interest in electroweak models on a five dimensional
interval that break the symmetry without a higgs boson. By warping the metric
of the interval it may be possible to avoid experimental bounds on extra W
bosons and delta rho. Five dimensional models necessarily require an explicit
UV cut-off to remain perturbative, such as that provided by deconstruction. We
study a simple deconstruction of this scenario with a chain of SU(2)^N+1 x
U(1)_Y groups linked by bi-fundamental higgs. There are two interesting
decoupling limits of this model, when the higgs vevs are taken large and when
the SU(2) couplings grow, which might provide a perturbative realization. In
fact it is very challenging to satisfy all the experimental bounds and the most
compatible scenario has both a higgs and a relatively strongly coupled new W
both close to 2 TeV


title: What Happens If an Unbroken Flavor Symmetry Exists?

abstract:
  Without assuming any specific flavor symmetry and/or any specific mass matrix
forms, it is demonstrated that if a flavor symmetry (a discrete symmetry, a
U(1) symmetry, and so on) exists, we cannot obtain the CKM quark mixing matrix
$V$ and the MNS lepton mixing matrix $U$ except for those between two families
for the case with the completely undegenerated fermion masses, so that we can
never give the observed CKM and MNS mixings. Only in the limit of $m_{\nu 1}
=m_{\nu 2}$ ($m_d=m_s$), we can obtain three family mixing with an interesting
constraint $U_{e3}=0$ ($V_{ub}=0$).


title: Spontaneously broken quark helicity symmetry

abstract:
  We discuss the origin of chiral symmetry breaking in the light-cone
representation of QCD. In particular, we show how quark helicity symmetry is
spontaneously broken in SU(N) gauge theory with massless quarks if that theory
has a condensate of fermion lightcone zero modes. The symmetry breaking appears
as induced interactions in an effective lightcone Hamiltonian equation based on
a trivial vacuum. The induced interaction is crucial for generating a splitting
between pseudoscalar and vector meson masses, which we illustrate with spectrum
calculations in some 1+1-dimensional reduced models of gauge theory.


title: New Features in FormCalc 4

abstract:
  FormCalc is a Mathematica package for the automatic computation of tree-level
and one-loop Feynman amplitudes. It accepts diagrams generated by FeynArts,
simplifies them, and generates a complete Fortran code for their numerical
evaluation. Version 4 includes new features which enhance performance,
convenience of use, and modularity/code reusability.


title:
On the validity of Lorentz invariance relations between parton
  distributions

abstract:
  Lorentz invariance relations connecting twist-3 parton distributions with
transverse momentum dependent twist-2 distributions have been proposed
previously. These relations can be extracted from a covariant decomposition of
the quark-quark correlator. It is argued, however, that the derivation of the
Lorentz invariance relations fails if the path-ordered exponential is taken
into account in the correlator. The model independent analysis is supplemented
by an explicit calculation of the corresponding parton distributions in
perturbative QCD with a quark target, and in a simple spectator model. We also
clarify the status of a specific calculation of time-reversal even parton
distributions in light-cone gauge.


title: Dynamics of confined gluons

abstract:
  Propagation of gluons in the confining vacuum is studied in the framework of
the background perturbation theory, where nonperturbative background contains
confining correlators. Two settings of the problem are considered. In the first
the confined gluon is evolving in time together with static quark and antiquark
forming the one-gluon static hybrid. The hybrid spectrum is calculated in terms
of string tension and is in agreement with earlier analytic and lattice
calculations. In the second setting the confined gluon is exchanged between
quarks and the gluon Green's function is calculated, giving rise to the Coulomb
potential modified at large distances. The resulting screening radius of 0.5 fm
presents a serious problem when confronting with lattice and experimental data.
A possible solution of this discrepancy is discussed.


title: Prompt photon production in nuclear collisions

abstract:
  We discuss the energy loss effects on single prompt photon production in
heavy-ion collisions at RHIC and LHC energy. The production of correlated
photon pairs at the LHC is also considered.


title: Partial wave analysis of pbar-p to Lambdabar-Lambda

abstract:
  A partial wave analysis of PS185 data for pbar-p to Lambda-bar Lambda is
presented. A 3S1 cusp is identified in the inverse process Lambda-bar Lambda to
pbar-p at threshold using detailed balance. Partial wave amplitudes for pbar-p
3P0, 3F3, 3D3 and 3G3 exhibit a behaviour very similar to resonances observed
in Crystal Barrel data. With this identification, the pbar-p to Lambda-bar
Lambda data then provide evidence for a new I = 0, J^{PC} = 1^{--} resonance
with mass M = 2290 +- 20 MeV, Gamma = 275 +- 35 MeV, coupling to both 3S1 and
3D1.


title: Reinterpreting several narrow `resonances' as threshold cusps

abstract:
  The threshold pbar-p peak in BES data for J/\Psi to gamma-pbar-p may be
fitted as a cusp. It arises from the well known threshold peak in pbar-p
elastic scattering due to annihilation. Several similar examples are discussed.
The PS185 data for pbar-p to Lambdabar-Lambda require an almost identical cusp
at the Lambdabar-Lambda threshold. There is also a cusp at the Sigma-N
threshold in Kminus-d to piminus-Lambda-p. Similar cusps are likely to arise at
thresholds for all 2-body de-excitation processes, providing the interaction is
attractive; likely examples are Lambda-pbar, Sigma-pbar, and Kbar-Lambda. The
narrow peak observed by Belle at 3872 MeV in piplus-piminus-J/Psi may be a 1++
cusp due to the Dbar-D* threshold. The narrow Xi*(1862) observed by NA49 may be
due to a threshold cusp in Sigma(1385)-Kbar coupled to Xi-pi and Sigma-Kbar.
The relation of cusps to known resonances such as fo(980) is discussed.


title: Solar Neutrinos Before and After Neutrino 2004

abstract:
  We compare, using a three neutrino analysis, the allowed neutrino oscillation
parameters and solar neutrino fluxes determined by the experimental data
available Before and After Neutrino 2004. New data available after Neutrino2004
include refined KamLAND and gallium measurements. We use six different
approaches to analyzing the KamLAND data. We present detailed results using all
the available neutrino and anti-neutrino data for Delta m^2_{12}, tan^2
theta_{12}, sin^2 theta_{13}, and sin^2 eta (sterile fraction). Using the same
complete data sets, we also present Before and After determinations of all the
solar neutrino fluxes, which are treated as free parameters, an upper limit to
the luminosity fraction associated with CNO neutrinos, and the predicted rate
for a 7Be solar neutrino experiment. The 1 sigma (3 sigma) allowed range of
Delta m^2_{21} = (8.2 +- 0.3) (^+1.0_-0.8)times 10^{-5} eV^2 is decreased by a
factor of 1.7 (5), but the allowed ranges of all other neutrino oscillation
parameters and neutrino fluxes are not significantly changed. Maximal mixing is
disfavored at 5.8 sigma and the bound on the mixing angle theta_{13} is
slightly improved to sin^2 theta_{13}<0.048 at 3 sigma. The predicted rate in a
7Be neutrino-electron scattering experiment is (0.665 +-0.015) of the rate
implied by the BP04 solar model in the absence of neutrino oscillations. The
corresponding predictions for p-p and pep experiments are, respectively, 0.707
{+0.011}{-0.013} and 0.644 {+0.011}{-0.013}. We derive upper limits to CPT
violation in the weak sector by comparing reactor anti-neutrino oscillation
parameters with neutrino oscillation parameters. We also show that the recent
data disfavor at 91 % CL a proposed non-standard interaction description of
solar neutrino oscillations.


title:
Comparative study of radio pulses from simulated hadron-, electron-, and
  neutrino-initiated showers in ice in the GeV-PeV range

abstract:
  High energy particle showers produce coherent Cherenkov radio emission in
dense, radio-transparent media such as cold ice. Using PYTHIA and GEANT
simulation tools, we make a comparative study among electromagnetic (EM) and
hadronic showers initiated by single particles and neutrino showers initiated
by multiple particles produced at the neutrino-nucleon event vertex. We include
all the physics processes and do a complete 3-D simulation up to 100 TeV for
all showers and to 1 PeV for electron and neutrino induced showers. We
calculate the radio pulses for energies between 100 GeV and 1 PeV and find
hadron showers, and consequently neutrino showers, are not as efficient below 1
PeV at producing radio pulses as the electromagnetic showers. The agreement
improves as energy increases, however, and by a PeV and above the difference
disappears. By looking at the 3-D structure of the showers in time, we show
that the hadronic showers are not as compact as the EM showers and hence the
radiation is not as coherent as EM shower emission at the same frequency. We
show that the ratio of emitted pulse strength to shower tracklength is a
function only of a single, coherence parameter, independent of species and
energy of initiating particle.


title:
On the mass differences between the scalar and pseudoscalar heavy-light
  mesons

abstract:
  We discuss the recent experimental observation which suggested that the mass
difference between the scalar and pseudoscalar heavy-light mesons is larger for
the non-strange states than for the strange ones. After computing the chiral
corrections in the heavy quark limit we show that, contrary to experiment, the
mass difference in the non-strange case should be smaller.


title:
Dynamics of strangeness production in the near threshold nucleon-nucleon
  collisions

abstract:
  We investigate the associated strangeness Lambda K+ and Sigma0 K+ productions
in proton-proton collisions within an effective Lagrangian model. The initial
interaction between the two nucleons is modeled by the exchange of pi, rho,
omega, and sigma mesons and the strangeness production proceeds via excitations
of N*(1650), N*(1710), and N*(1720) baryonic resonances. The parameters of the
model at the nucleon-nucleon-meson vertices are determined by fitting the
elastic nucleon-nucleon scattering with an effective interaction based on the
exchange of these four mesons, while those at the resonance vertices are
calculated from the known decay widths of the resonances and from the vector
meson dominance model. Experimental data taken recently by the COSY-11
collaboration are described well by this approach. The one-pion-exchange
diagram dominates the production process at both higher and lower beam
energies. The excitation of the N*(1650) resonance dominates both the
production channels at near threshold energies. Our model with final state
interaction effects among the outgoing particles included within the
Watson-Migdal approximation, is able to explain the observed beam energy
dependence of the ratio of the total cross sections of these two reactions.


title:
Comparisons of Fully Differential Exact Results for O(alpha) Virtual
  Corrections to Single Hard Bremsstrahlung in e+e- Annihilation at High
  Energies

abstract:
  We present comparisons of the fully differential exact virtual correction to
the important single hard bremsstrahlung process in e+e- annihilation at high
energies, which is essential for precision studies of the Standard Model from 1
GeV to 1 TeV, as calculated by two completely independent methods and groups.
We show that the two sets of results are in excellent agreement.
Phenomenological implications are discussed.


title: Supersymmetric 3-3-1 model with right-handed neutrinos

abstract:
  We consider the supersymmetric extension of the 3-3-1 model with right-handed
neutrinos. We study the mass spectra in the scalar and pseudoscalar sectors,
and for a given set of the input parameters, we find that the lightest scalar
in the model has a mass of 130 GeV and the lightest pseudoscalar has mass of 5
GeV. However, this pseudoscalar decouples from the $Z^0$ at high energy scales
since it is almost a singlet under $SU(2)_L\otimes U(1)_Y$.


title: CP asymmetry in flavour-specific B decays

abstract:
  I first discuss the phenomenology of a^q_fs (q=d,s), which is the CP
asymmetry in flavour-specific B_q decays such as B_d -> X l^+ nu-bar_l or B_s
-> D_s^- pi^+. a^q_fs can be obtained from the time evolution of any untagged
B_q decay. Then I present recently calculated next-to-leading-order QCD
corrections to a_fs^q, which reduce the renormalisation scheme uncertainties
significantly. For the Standard Model we predict a^d_fs=-(5.0 +/- 1.1)*10^(-4)
and a^s_fs= (2.1 +/-0.4)*10^-5. As a by-product we determine the ratio of the
width difference in the B_d system and the average B_d width to (Delta
Gamma_d)/Gamma_d = (3.0 +/- 1.2)*10^(-3) at next-to-leading order in QCD.


title: Probing New Physics by Comparing Solar and KamLAND Data

abstract:
  We explore whether KamLAND and solar data may end up inconsistent when
analyzed in terms of two-flavor neutrino oscillations. If this turned out to be
the case, one would be led to conclude that there is more new physics, besides
neutrino masses and mixing, in the leptonic sector. On the other hand, given
that KamLAND and solar data currently agree when analyzed in terms of
two-flavor neutrino oscillations, one is able to place nontrivial bounds on
several manifestations of new physics. In particular, we compute how well a
combined KamLAND and solar data analysis is able to constrain a specific form
of violation of CPT invariance by placing a very stringent upper bound, |Delta
m^2 - Delta bar{m}^2| < 1.1 10^{-4} eV^2 (3 sigma). We also estimate upper
bounds on sin^2 theta - sin^2 bar{theta}. These are quite poor due to the fact
that matter effects are almost irrelevant at KamLAND, which leads to an
intrinsic inability to distinguish whether the antineutrino mixing angle is on
the light (bar{theta} < pi/4) or dark side of the parameter space (bar{theta} >
pi/4). We briefly discuss whether this ambiguity can be resolved by future
long-baseline bar{nu}_e to bar{nu}_{e,mu} searches.


title:
Collins-Soper Equation for the Energy Evolution of Transverse-Momentum
  and Spin Dependent Parton Distributions

abstract:
  The hadron-energy evolution (Collins and Soper) equation for all the
leading-twist transverse-momentum and spin dependent parton distributions is
derived in the impact parameter space. Based on the result, we present
resummation formulas for the spin structure functions in the semi-inclusive
deep inelastic scattering.


title: LRG Production of Di-Jets As a Probe of s-Channel Unitarity

abstract:
  Hard diffractive production of di-jets in the Tevatron and HERA are explored.
It is argued that a consistent pQCD description of these data can be attained
after s-channel unitarity re-scattering screening corrections are incorporated
in the calculation. To this end a simple procedure is presented in which
information derived from the measured soft total, elastic and diffractive cross
sections simplifies the calculation and makes it parameter free. The above
approach eliminates the inconsistencies seemingly observed when comparing the
rates of diffractive di-jets production in different channels.


title: Leptogenesis at the TeV scale

abstract:
  We consider a generic model with four gauge singlets which generates
successfully the right amount of baryon asymmetry through leptogenesis at the
TeV scale. It also reproduces left-handed neutrino masses compatible with
present data. In the present work, we perform a study of thermal production
mechanisms of the lightest right-handed neutrino $N_{1}$ responsible for the
lepton asymmetry taking into account all dominant processes (decays, $\Delta L
= 1$ and $\Delta L=2$ scatterings) by solving the full Boltzmann equations.


title:
QCD sum rules and radial excitaions of light pseudoscalar and scalar
  mesons

abstract:
  The calculations of masses and decay constants of the radial excitations of
light pseudoscalar and scalar mesons within QCD sum rules method are briefly
reviewed. The predictions are based on the $1/N_c$-supported model spectra,
which consist of infinite number of infinitely narrow resonances, and on the
assumption that the ground states of light scalar mesons may be considered as
the $\bar{q}q$-bound states. The results of the studies are compared with the
existing experimental data and with the predictions of other theoretical
approaches.


title:
Supersymmetric two-loop contributions to the anomalous magnetic moment
  of the muon

abstract:
  Recent results of two interesting classes of supersymmetric two-loop
contributions to (g-2)_mu are presented. Two-loop diagrams involving a closed
sfermion loop can amount to 5*10^{-10} or almost one standard deviation of the
current experimental uncertainty, and two-loop diagrams with a closed
chargino/neutralino loop can be similarly large. The dependence of these two
classes on the unknown supersymmetric parameters and the sensitivity on
existing experimental constraints on the parameter space are quite different.
We also comment on the calculational techniques, in particular the large mass
expansion and the treatment of gamma_5 and the epsilon-tensor.


title: Studies of resonance conditions on neutrino oscillations in matter

abstract:
  We analytically discuss the resonance conditions among several neutrinos in
matter. The discriminant for the characteristic equation of the Hamiltonian is
expressed by the coefficients of the equation. The result of the computation
for the discriminants tells us that the neutrino energy and the matter density
are in inverse proportion to each other at the resonance states in not only 2-
but also 3- and 4-neutrino models.


title: A Limit on Short-range Modifications to Gravity

abstract:
  There has been considerable interest in providing new limits on the short
range behaviour of gravity, or, in general, anomalous short-range interactions.
In this note we show that one use the interaction of ultra-cold neutrons to
obtain a better limit below about 10 nm.


title: CP violation in chargino production and decay into sneutrino

abstract:
  We study CP odd asymmetries in chargino production E+ E- --> ~Chi(+-)(1)
\~Chi(-+)(2) and the subsequent two-body decay of one chargino into a
sneutrino. We show that in the Minimal Supersymmetric Standard Model with
complex parameter \mu the asymmetries can reach 30 %. We discuss the
feasibility of measuring these asymmetries at a linear collider with \sqrt{s} =
800 GeV and longitudinally polarized beams.


title:
Large distance behaviour of light cone operator product in perturbative
  and nonperturbative QCD regimes

abstract:
  We evaluate the coordinate space dependence of the matrix elements of the
commutator of the electromagnetic and gluon currents in the vicinity of the
light-cone but at large distances within the parton model, DGLAP, the
resummation approaches to the small x behaviour of DIS processes, and for the
Unitarity Bound. We find that an increase of the commutator with relative
distance $py$ as $\propto (py)f(py,y^2=t^2-r^2)$ is the generic property of QCD
at small but fixed space-time interval $y^2=t^2-r^2$ in perturbative and
nonperturbative QCD regimes. We explain that the factor $py$ follows within the
dipole model (QCD factorization theorem) from the properties of Lorents
transformation. The increase of $f(r)$ disappeares at central impact parameters
if cross section of DIS may achieve the Unitarity Limit. We argue that such
long range forces are hardly consistent with thermodynamic equilibrium while a
Unitarity Limit may signal equilibration. Possible implications of this new
long range interaction are briefly discussed.


title: Parity violation in hot QCD: how to detect it

abstract:
  In a recent paper (arXive:hep-ph/0406125) entitled {\em Parity violation in
hot QCD: why it can happen, and how to look for it}, D. Kharzeev argues for the
possibility of P- and/or CP- violation effects in heavy-ion collisions, the
effects that can manifest themselves via asymmetry in $\pi^{\pm}$ production
with respect to the direction of the system angular momentum. Here we present
an experimental observable that can be used to detect and measure the effects.


title: Resonances, and mechanisms of Theta-production

abstract:
  After explaining necessity of exotic hadrons, we discuss mechanisms which
could determine production of the exotic Theta-baryon. A possible important
role of resonances (producing the Theta in real or virtual decays) is
emphasized for various processes. Several experimental directions for studies
of such resonances, and the Theta itself, are suggested. We briefly discuss
also recent negative results on the Theta-baryon.


title:
On the determination of CP-even and CP-odd components of a mixed CP
  Higgs boson at $e^+$ $e^-$ collider

abstract:
  We present a method to investigate the CP quantum numbers of the Higgs boson
in the process $e^+ e^- \to Z\phi$ at a future linear collider (LC), where
$\phi$, a generic Higgs boson, is a mixture of CP-even and CP-odd states. The
procedure consist of a comparison of the data with predictions obtained from
Monte Carlo simulations corresponding to the productions of scalar and
pseudoscalar Higgs and the interference term wich constitutes a distinctive
signal of CP violation. We present estimates of the sensitivity of the method
from Monte Carlo studies using hypothetical data samples with a full LC
detector simulation taking into account the background signals.


title: Minimal Grand Unification Model in an Anthropic Landscape

abstract:
  It has been recently pointed out by Arkani-Hamed and Dimopoulos that if the
universe is a landscape of vacua, and if therefore fine-tuning is not a valid
guidance principle for searching for physics beyond the standard model,
supersymmetric unification only requires the fermionic superpartners. We argue
that in that landscape scenario, the fermionic superpartners are not needed for
unification, which can be achieved in SO(10) either via a direct breaking to
the standard model at the grand unification scale or through an intermediate
gauge symmetry. In most minimal SO(10) models, the proton lifetime is long
enough to avoid the experimental bounds. These models are the truly minimal
fine-tuned extensions of the standard model in the sense proposed by Davoudiasl
et al..


title:
Radiative generation of light fermion masses in a $SU(3)_H$ horizontal
  symmetry model

abstract:
  In a model with a gauge group $SU(3)_H\otimes G_{SM}$, where $SU(3)_H$ is a
horizontal symmetry and $G_{SM}=SU(3)_C\otimes SU(2)_L\otimes U(1)_Y$ is the
standard model, we propose a radiative mechanism of mass generation mediated by
the $SU(3)_H$ gauge bosons for the light fermions, meanwhile the masses of the
heaviest family are generated by the implementation of see-saw mechanisms with
the introduction of vectorial fermions.


title:
Search for Lepton Flavor Violation in the Higgs Boson Decay at a Linear
  Collider

abstract:
  We discuss possibility of direct search for lepton flavor violation (LFV) in
Yukawa interaction by measuring the branching ratio for the decay of the
lightest Higgs boson ($h^0$) into a $\tau$-$\mu$ pair at a linear collider. We
study the significance of the signal process, $e^+e^- \to Z^\ast \to Z h^0 \to
Z \tau^\pm \mu^\mp$, against the backgrounds such as $e^{+}e^{-} \to Z
\tau^{+}\tau^{-} \to Z \tau^{\pm}\mu^{\mp}+$ missings. After taking appropriate
kinematic cuts, the number of the background event is considerably reduced, so
that the signal can be visible when the branching ratio of $h^0 \to \tau^\pm
\mu^\mp$ is larger than about $10^{-4}$. In a Minimal Supersymmetric Standard
Model scenario, the effective coupling of $h^0 \tau^\pm \mu^\mp$ can be
generated at loop level due to the slepton mixing. When supersymmetric mass
parameters are larger than TeV scales, the branching ratio can be as large as
several times $10^{-4}$. Therefore, the signal can be marginally visible at a
LC. In the general two Higgs doublet model, the possible maximal value for the
branching ratio of $h^0 \to \tau^\pm \mu^\mp$ can reach to a few times
$10^{-3}$ within the available experimental bound, so that we can obtain larger
significance.


title: Study of the slepton non-universality at the CERN Large Hadron Collider

abstract:
  In supersymmetric theory, the sfermion-fermion-gaugino interactions conserve
the chirality of (s)fermions. The effect appears as the charge asymmetry in
$m(jl)$ distributions at the CERN Large Hadron Collider where jets and leptons
arise from the cascade decay $\tilde{q} \to q \tilde{\chi}^0_2 \to
ql\tilde{l}$. Furthermore, the decay branching ratios and the charge
asymmetries in $m(jl)$ distributions are flavor non-universal due to the
$\tilde{l}_L$ and $\tilde{l}_R$ mixing. When $\tan\beta$ is large, the
non-universality between $e$ and $\mu$ becomes $O(10)%$ level. We perform a
Monte Carlo simulation for some minimal supergravity benchmark points to
demonstrate the detectability.


title: Infrared finite cross sections at NNLO

abstract: I discuss methods for the cancellation of infrared divergences at NNLO.


title: The Fragility of High-pT Hadron Spectra as a Hard Probe

abstract:
  We study the suppression of high-pT hadron spectra in nuclear collisions,
supplementing the perturbative QCD factorized formalism with radiative parton
energy loss. We find that the nuclear modification factor which quantifies the
degree of suppression, is almost pT-independent both for RHIC (in agreement
with data) and for the LHC. This is a consequence of the shape of the partonic
pT-spectrum in elementary collisions which implies that for the same value of
the nuclear modification factor at higher pT, an increasingly smaller fraction
of parton energy loss is needed. When the values of the time-averaged transport
coefficient exceed 5 GeV^2/fm, the nuclear modification factor gradually loses
its sensitivity to the corresponding produced energy density. This is due to
particle production in the outer corona of the medium, which remains almost
unsuppressed even for extreme densities. Thus, even for the highest
experimentally accessible transverse momentum at the LHC and in contrast to
jets, the measurement of leading partons via leading hadrons is not a
penetrating probe of the dense matter, but a rather fragile probe which
fragments for the opacities reached below the skin of the medium. Relating the
transport coefficient to the energy density produced in the collision region,
we find and discuss a phenomenon reminiscent of the opacity problem of elliptic
flow: namely, the interaction of the hard parent parton with the medium appears
to be much stronger than that expected for perturbative interactions of the
hard parton with an ideal quark gluon plasma.


title:
Determination of quark-antiquark component of the photon wave function
  for u, d, s quarks

abstract:
  Based on the data for the transitions pi0, eta, eta' -> gamma gamma^*(Q^2)
and reactions of the e^+ e^- -annihilations, e^+ e^- -> rho0, omega, phi and
e^+ e^--> hadrons at 1<E_{e^+e^-}<3.7 GeV, we determine the light-quark
components of the photon wave function gamma^*(Q^2) -> q anti-q (q= u, d, s)
for the region 0< Q^2 <1 (GeV/c)^2.


title: Sum rules for hadronic elastic scattering for the Tevatron, RHIC and LHC

abstract:
  Under the assumption of total absorption and dominance of the imaginary part
of the scattering amplitude, we present a sum rule for any hadronic elastic
differential cross-section ${d\sigma}\over{dt}$: the dimensionless quantity
${{1}\over{2}}\int (dt)\sqrt{{{1}\over {\pi}}{{d\sigma}\over{dt}}} \to 1$, at
asymptotic energies. Experimental data from ISR and Tevatron confirm a trend
towards its saturation and some estimates are presented for LHC. Its
universality and further consequences for the nature of absorption in QCD based
models for elastic and total cross-sections are explored.


title: LHC/LC Interplay in the MSSM Higgs Sector

abstract:
  The interplay of prospective experimental information from both the Large
Hadron Collider (LHC) and the Linear Collider (LC) in the investigation of the
MSSM Higgs sector is analyzed in the SPS~1a and SPS 1b benchmark scenarios.
Combining LHC information on the heavy Higgs states of the MSSM with precise
measurements of the mass and branching ratios of the lightest CP-even Higgs
boson at the LC provides a sensitive consistency test of the MSSM. This allows
to set bounds on the trilinear coupling A_t. In a scenario where LHC and LC
only detect one light Higgs boson, the prospects for an indirect determination
of M_A are investigated. In particular, the impact of the experimental errors
of the other SUSY parameters is analyzed in detail. We find that a precision of
about 20% (30%) can be achieved for M_A = 600 (800) GeV.


title: Extracting Higgs boson couplings from LHC data

abstract:
  We show how LHC Higgs boson production and decay data can be used to extract
gauge and fermion couplings of Higgs bosons. We show that very mild theoretical
assumptions, which are valid in general multi-Higgs doublet models, are
sufficient to allow the extraction of absolute values for the couplings rather
than just ratios of the couplings. For Higgs masses below 200 GeV we find
accuracies of 10-40% for the Higgs boson couplings and total width after
several years of LHC running. Slightly stronger assumptions on the Higgs gauge
couplings even lead to a determination of couplings to fermions at the level of
10-20%. We also study the sensitivity to deviations from SM predictions in
several supersymmetric benchmark scenarios as a subset of the analysis.


title: Precision Measurements and CKM Unitarity

abstract:
  Determinations of $\vud$ and $\vus$ along with their implications for the
unitarity test $\vud^2+\vus^2+\vub^2=1$ are discussed. The leading two loop
radiative corrections to neutron $\beta$-decay are evaluated and used to derive
a refined relationship $\vud^2 \tau_n (1+3g_A^2)=4908(4)$sec. Employing $\vud
=0.9740(5)$ from superallowed nuclear decays and the measured neutron lifetime
$\tau_n = 885.7(7)$sec, leads to the precise prediction $g_A=1.2703(8)$ which
is compared with current direct experimental values. Various extractions of
$\vus$ are described and updated. The long accepted Particle Data Group value
of $\vus$ from fitted $K_{e3}$ decay rates suggests a deviation from CKM
unitarity but it is contradicted by more recent experimental results which
confirm unitarity with good precision.
  An outlook for possible future advances is given.


title: A nonperturbative calculation of the electron's magnetic moment

abstract:
  In principle, the complete spectrum and bound-state wave functions of a
quantum field theory can be determined by finding the eigenvalues and
eigensolutions of its light-cone Hamiltonian. One of the challenges in
obtaining nonperturbative solutions for gauge theories such as QCD using
light-cone Hamiltonian methods is to renormalize the theory while preserving
Lorentz symmetries and gauge invariance. For example, the truncation of the
light-cone Fock space leads to uncompensated ultraviolet divergences. We
present two methods for consistently regularizing light-cone-quantized gauge
theories in Feynman and light-cone gauges: (1) the introduction of a spectrum
of Pauli-Villars fields which produces a finite theory while preserving Lorentz
invariance; (2) the augmentation of the gauge-theory Lagrangian with higher
derivatives. In the latter case, which is applicable to light-cone gauge (A^+ =
0), the A^- component of the gauge field is maintained as an independent degree
of freedom rather than a constraint. Finite-mass Pauli-Villars regulators can
also be used to compensate for neglected higher Fock states. As a test case, we
apply these regularization procedures to an approximate nonperturbative
computation of the anomalous magnetic moment of the electron in QED as a first
attempt to meet Feynman's famous challenge.


title:
The Theory of CP-Violation -- in as Much of a Nutshell as Will Fit on 8
  Pages

abstract:
  Do you know that CP violation is intrinsically linked to the scalar sector of
the Standard Model and its extensions? If yes, you need read no further - if
no, you may turn over the titlepage and start reading now.


title: Charmonium at BES and CLEO-c

abstract:
  This paper gives a short summary of some of the aspects of charmonium which
can be addressed at BES and CLEO-c and other $e^+e^-$ facilities. These topics
include the spectroscopy of charmonium states, radiative transitions, $e^+e^-$
widths, two-photon widths, hadron loop effects and open-flavor strong decays.


title:
Update of the solar neutrino oscillation analysis with the 766 Ty
  KamLAND spectrum

abstract:
  We investigate the impact of the 766.3 Ty KamLAND spectrum data on the
determination of the solar neutrino oscillation parameters. We show that the
observed spectrum distortion in the KamLAND experiment firmly establishes
$\Delta m^2_{21}$ to lie in the low-LMA solution region. The high-LMA solution
is excluded at more than 4$\sigma$ by the global solar neutrino and KamLAND
spectrum data. The maximal solar neutrino mixing is ruled out at $6\sigma$
level. The $3\sigma$ allowed region in the $\Delta m^2_{21}-\sin^2\theta_{12}$
plane is found to be remarkably stable with respect to leaving out the data
from one of the solar neutrino experiments from the global analysis. We perform
a three flavor neutrino oscillation analysis of the global solar neutrino and
KamLAND spectrum data as well. The $3\sigma$ upper limit on $\sin^2\theta_{13}$
is found to be $ \sin^2\theta_{13} <0.055$. We derive predictions for the CC to
NC event rate ratio and day-night (D-N) asymmetry in the CC event rate,
measured in the SNO experiment, and for the suppression of the event rate in
the BOREXINO and LowNu experiments. Prospective high precision measurements of
the solar neutrino oscillation parameters are also discussed.


title: Note about leptogenesis from gravity waves in models of inflation

abstract:
  We show how the mechanism recently proposed by Alexander, Peskin, and
Sheikh-Jabbari, in which the observed cosmic matter-antimatter asymmetry comes
from the contribution of the cosmological tensor perturbations to the
gravitational anomaly in the Standard Model, does not work. This holds when
taking into account the commutation relations for the creation-annihilation
operators associated to the gravitational waves and the geometrical properties
of the polarization tensors.


title:
Soft and hard components of two-particle distributions on
  ($y_t,\eta,\phi$) from p-p collisions at $\sqrt{s} = 200$ GeV

abstract:
  We report measurements of large-scale two-particle correlations for 200 GeV
p-p collisions on momentum components transverse rapidity $y_t$ (pion mass
assigned), pseudorapidity $\eta$ and azimuth angle $\phi$. In both transverse
$y_t \otimes y_t$ and axial $(\eta\otimes\eta,\phi\otimes\phi) $ two-particle
subspaces we observe two components of correlation structure (soft and hard)
which we interpret respectively in terms of longitudinal string fragmentation
and transverse minimum-bias parton fragmentation (minijets). This combination
is also represented by Lund-model-based Monte Carlo simulations such as Pythia.


title: Radiative Decays of Decuplet to Octet Baryons in Light Cone QCD

abstract:
  The radiative decays of decuplet to octet baryons are analyzed within the
light cone QCD sum rules framework.The electromagnetic transition form factors
for these decays are calculated up to twist four accuracy for photon wave
functions as well as including first order strange quark mass corrections. A
comparison of our results with predictions of lattice theory and existing
experimental data is presented.


title:
A numerical approach to infrared divergent multi-parton phase space
  integrals

abstract:
  It is described how the method of sector decomposition can serve to
disentangle overlapping infrared singularities, in particular those occurring
in the calculation of the real emission part of e+e- to 2 jets and e+e- to 3
jets at NNLO.


title: Two regularizations - two different models of Nambu-Jona-Lasinio

abstract:
  Two variants of the Nambu--Jona-Lasinio model -- the model with 4-dimensional
cutoff and the model with dimensionally-analytical regularization -- are
systematically compared. It is shown that they are, in essence, two different
models of light-quark interaction. In the mean-field approximation the
distinction becomes apparent in a behavior of scalar amplitude near the
threshold. For 4-dimensional cutoff the pole term can be extracted, which
corresponds to sigma-meson. For dimensionally-analytical regularization the
singularity of the scalar amplitude is not pole, and this singularity is quite
disappeared at some value of the regularization parameter.
  Still more essential distinction of these models exists in the
next-to-leading order of mean-field expansion. The calculations of meson
contributions in the quark chiral condensate and in the dynamical quark mass
demonstrate, that these contributions though their relatively smallness can
destabilize the Nambu--Jona-Lasinio model with 4-dimensional cutoff. On the
contrary, the Nambu--Jona-Lasinio model with dimensionally-analytical
regularization is stabilized with the next-to-leading order, i.e. the value of
the regularization parameter shifts to the stability region, where these
contributions decrease.


title: Bounds on the Higgs Boson Mass from M_W

abstract:
  Recent experimental and theoretical progress in the M_H estimates from M_W
and Sin^2_eff_lept is reviewed, with particular emphasis on the role played by
M_t. Assuming that the SM is correct and taking into account the lower bound on
M_H from direct searches, we derive restrictive bounds on M_W and M_t. We also
discuss a representative ``benchmark'' scenario for the possible future
evolution of these parameters. Amusingly, this benchmark scenario suggested
some time ago a value for M_t that turned out to be in very close agreement
with its most recent experimental determination.


title: Electroweak corrections to e+ e- -> f anti-f H

abstract:
  Some of the most interesting Higgs-production processes at future e+ e-
colliders are of the type e+ e- -> f anti-f H. We present a calculation of the
complete O(alpha) corrections to these processes in the Standard Model for
final-state neutrinos and top quarks. Initial-state radiation beyond O(alpha)
at the leading-logarithmic level as well as QCD corrections are also included.
The electroweak corrections turn out to be sizable and reach the order of
+/-10% and will thus be an important part of precise theoretical predictions
for future e+ e- colliders.


title:
The Neutron Electric Dipole Moment in the Instanton Vacuum: Quenched
  Versus Unquenched Simulations

abstract:
  We investigate the role played by the fermionic determinant in the evaluation
of the CP-violating neutron electric dipole moment (EDM) adopting the Instanton
Liquid Model. Significant differences between quenched and unquenched
calculations are found. In the case of unquenched simulations the neutron EDM
decreases linearly with the quark mass and is expected to vanish in the chiral
limit. On the contrary, within the quenched approximation, the neutron EDM
increases as the quark mass decreases and is expected to diverge as (1/m)**Nf
in the chiral limit. We argue that such a qualitatively different behavior is a
parameter-free, semi-classical prediction and occurs because the neutron EDM is
sensitive to the topological structure of the vacuum. The present analysis
suggests that quenched and unquenched lattice QCD simulations of the neutron
EDM as well as of other observables governed by topology might show up
important differences in the quark mass dependence, for mq < Lambda(QCD).


title: Pion Form Factor in the Light-Front

abstract:
  The pion electromagnetic form factor is calculated with a light-front quark
model. The "plus" and "minus" component of the electromagnetic current are used
to calculate the electromagnetic form factor in the Breit frame with two models
for the q\bar{q} vertex. The light front constituent quark models describes
very well hadronic wave function for pseudo-scalar and vector particles.
Symmetry problems arinsing in the light-front approach are solved by the pole
dislocation method. The results are compared with new experimental data and
with other quark models.


title:
Collinear splitting, parton evolution and the strange-quark asymmetry of
  the nucleon in NNLO QCD

abstract:
  We consider the collinear limit of QCD amplitudes at one-loop order, and
their factorization properties directly in colour space. These results apply to
the multiple collinear limit of an arbitrary number of QCD partons, and are a
basic ingredient in many higher-order computations. In particular, we discuss
the triple collinear limit and its relation to flavour asymmetries in the QCD
evolution of parton densities at three loops. As a phenomenological consequence
of this new effect, and of the fact that the nucleon has non-vanishing quark
valence densities, we study the perturbative generation of a
strange--antistrange asymmetry $s(x)-\bar{s}(x)$ in the nucleon's sea.


title: Dynamics of Interacting Scalar Fields in Expanding Space-Time

abstract:
  The effective equation of motion is derived for a scalar field interacting
with other fields in a Friedman-Robertson-Walker background space-time. The
dissipative behavior reflected in this effective evolution equation is studied
both in simplified approximations as well as numerically. The relevance of our
results to inflation are considered both in terms of the evolution of the
inflaton field as well as its fluctuation spectrum. A brief examination also is
made of supersymmetric models that yield dissipative effects during inflation.


title: Bethe-Salpeter Meson Masses Beyond Ladder Approximation

abstract:
  The effect of quark-gluon vertex dressing on the ground state masses of the
u/d-quark pseudoscalar, vector and axialvector mesons is considered with the
Dyson-Schwinger equations. This extends the ladder-rainbow Bethe-Salpeter
kernel to 2-loops. To render the calculations feasible for this exploratory
study, we employ a simple infrared dominant model for the gluon exchange that
implements the vertex dressing. The resulting model, involving two distinct
representations of the effective gluon exchange kernel, preserves both the
axial-vector Ward-Takahashi identity and charge conjugation symmetry. Numerical
results confirm that the pseudoscalar meson retains its Goldstone boson
character. The vector meson mass, already at a very acceptable value at ladder
level, receives only 30 MeV of attraction from this vertex dressing. For the
axial-vector states, which are about 300 MeV too low in ladder approximation,
the results are mixed: the $1^{+-}$ state receives 290 MeV of repulsion, but
the $1^{++}$ state is lowered further by 30 MeV. The exotic channels $0^{--}$
and $1^{-+}$ are found to have no states below 1.5 GeV in this model.


title: Proton Stability and Dark Matter: Are They Related?

abstract:
  We address the problem of baryon number violation in Randall-Sundrum
backgrounds and provide a solution leading to a stable light Kaluza--Klein
fermion in warped GUT. This adds to the list of dark matter candidates which
stability can follow from ensuring proton stability in weak scale extensions of
the Standard Model


title: Theoretical Implications of the LEP Higgs Search

abstract:
  We study the implications for the minimal supersymmetric standard model
(MSSM) of the absence of a direct discovery of a Higgs boson at LEP. First we
exhibit 15 physically different ways in which one or more Higgs bosons lighter
than the LEP limit could still exist. For each of these cases -- as well as the
case that the lightest Higgs eigenstate is at, or slightly above, the current
LEP limit -- we provide explicit sample configurations of the Higgs sector as
well as the soft supersymmetry breaking Lagrangian parameters necessary to
generate these outcomes. We argue that all of the cases seem fine-tuned, with
the least fine-tuned outcome being that with Higgs mass near 115 GeV. Seeking
to minimize this tuning we investigate ways in which the ``maximal-mixing''
scenario with large top-quark trilinear A-term can be obtained from simple
string-inspired supergravity models. We find these obvious approaches lead to
heavy gauginos and/or problematic low-energy phenomenology with minimal
improvement in fine-tuning.


title: On measuring alpha in B(t)-> rho^\pm pi^\mp

abstract:
  Defining a most economical parametrization of time-dependent B-> rho^\pm
pi^\mp decays, including a measurable phase alpha_{eff} which equals the weak
phase alpha in the limit of vanishing penguin amplitudes, we propose two ways
for determining alpha in this processes. We explain the limitation of one
method, assuming only that two relevant tree amplitudes factorize and that
their relative strong phase, delta_t, is negligible. The other method, based on
broken flavor SU(3), permits a determination of alpha in B^0-> rho^\pm pi^\mp
in an overconstrained system using also rate measurements of B^{0,+}-> K^* pi
and B^{0,+}->rho K. Current data are shown to restrict two ratios of penguin
and tree amplitudes, r_\pm, to a narrow range around 0.2, and to imply an upper
bound |alpha_{eff} - alpha| < 15 degrees. Assuming that delta_t is much smaller
than 90 degrees, we find alpha =(93\pm 16) degrees and (102 \pm 20) degrees
using BABAR and BELLE results for B(t)-> rho^\pm pi^mp. Avoiding this
assumption for completeness, we demonstrate the reduction of discrete
ambiguities in alpha with increased statistics, and show that SU(3) breaking
effects are effectively second order in r_\pm.


title: Multiparticle amplitudes at one-loop: an algebraic/numeric approach

abstract:
  We discuss algebraic/numeric methods to compute one-loop corrections for
multiparticle/jet production cross sections. By using efficient reduction
algorithms a compact expression for the ggg\gamma\gamma -> 0 amplitude is
obtained. Further a numerical approach for 6-point 1-loop diagrams is
presented.


title: Spectator effects and lifetimes of heavy hadrons

abstract:
  We present a calculation of subleading 1/m_b corrections to spectator effects
in the ratios of beauty hadron lifetimes in heavy-quark expansion. We find that
these effects are sizable and should be taken into account in systematic
analyses of heavy hadron lifetimes. In particular, the inclusion of 1/m_b
corrections brings into agreement the theoretical predictions and experimental
observations of the ratio of lifetimes of \Lambda_b-baryon and B_d meson. We
obtain \tau(B_u)/\tau(B_d) = 1.06 \pm 0.02, \tau(B_s)/\tau(B_d)= 1.00 \pm 0.01,
\tau(\Lambda_b)/\tau(B_d)= 0.86 \pm 0.05.


title:
Scherk-Schwarz Supersymmetry Breaking for Quasi-localized Matter Fields
  and Supersymmetry Flavor Violation

abstract:
  We examine the soft supersymmetry breaking parameters induced by the
Scherk-Schwarz (SS) boundary condition in 5-dimensional orbifold field theory
in which the quark and lepton zero modes are quasi-localized at the orbifold
fixed points to generate the hierarchical Yukawa couplings. In such theories,
the radion corresponds to a flavon to generate the flavor hierarchy and at the
same time plays the role of the messenger of supersymmetry breaking. As a
consequence, the resulting soft scalar masses and trilinear $A$-parameters of
matter zero modes at the compactification scale are highly flavor-dependent,
thereby can lead to dangerous flavor violations at low energy scales. We
analyze in detail the low energy flavor violations in SS-dominated
supersymmetry breaking scenario under the assumption that the compactification
scale is close to the grand unification scale and the 4-dimensional effective
theory below the compactification scale is given by the minimal supersymmetric
standard model. Our analysis can be applied to any supersymmetry breaking
mechanism giving a sizable $F$-component of the radion superfield, e.g. the
hidden gaugino condensation model.


title:
A General analysis of the lepton polarizations in Bs ->\gamma \ell^+
  \ell^- decays

abstract:
  We present a general analysis of the lepton polarizations in the rare Bs
->\gamma \ell^+ \ell^- decays by using the most general model independent form
of the effective Hamiltonian. The sensitivity of the longitudinal, transverse
and normal polarizations of final state leptons, as well as lepton-antilepton
combined asymmetries, on the new Wilson coefficients are investigated. It has
been shown that all these physical observables are very sensitive to the
existence of new physics beyond the standard model and their experimental
measurements can give valuable information about it.


title: QCD Saturation Equations including Dipole-Dipole Correlation

abstract:
  We derive two coupled non-linear evolution equations corresponding to the
truncation of the Balitsky infinite hierarchy of saturation equations after
inclusion of dipole-dipole correlations, i.e. one step beyond the
Balitsky-Kovchegov (BK) equation. We exhibit an exact solution for maximal
correlation which still satisfies the same asymptotic geometric scaling as BK
but with the S-matrix going to 1/2 (instead of 0) in the full saturation
region.


title: The underlying event and fragmentation

abstract:
  A good fit to the CDF underlying event is obtained in the multiple parton
scattering picture using HERWIG, after modifying the cluster hadronization
algorithm as suggested by our previous study and adopting a larger maximum
cluster size. The number of scatters per event is generated simply as a Poisson
distribution. If our picture is correct, the baryon yield should be enhanced in
the underlying event. This effect may be studied by measuring the
proton-to-pion ratio.


title:
Why care about $(\theta_{13},\delta)$ degeneracy at future neutrino
  experiments

abstract:
  The presence of several clone solutions in the simultaneous measurement of
($\theta_{13},\delta$) has been widely discussed in literature. Here, after a
pedagogical introduction on why these clones arise, we discuss how the clones
location in the ($\theta_{13},\delta$) plane change as a function of the
physical input pair ($\bar\theta_{13},\bar\delta$). We compare the clone flow
of a set of possible future neutrino experiments: the CERN SuperBeam, BetaBeam
and Neutrino Factory proposals. We show that the combination of these specific
BetaBeam and SuperBeam could not help in solving the degeneracies. The
combination of one of them with the Neutrino Factory Golden and Silver channel
can, instead, be used to solve completely the eightfold degeneracy.


title:
Neutrino in magnetic fields: from the first studies to the new effects
  in neutrino oscillations

abstract:
  In this paper I should like to present {\bf {{the four new effects}}} in
neutrino oscillations that have been recently investigated in my research group
at the Department of Theoretical Physics of the Moscow State University. Due to
the fact that these studies were stimulated by our previous research of
neutrino interactions in the presence of magnetic fields, and also because the
year 2004 commemorates the 40th years jubilee since the the first paper on the
neutrino interaction in a magnetic field was published, a short review on the
first papers dedicated to the problem of neutrinos in magnetic fields, and also
on the recent results in this field, prefaces (Section 1) the discussion on
{\bf the new effects} in neutrino oscillations. Section 2 is devoted to our
recent studies of the electromagnetic properties of a {\it massive} neutrino,
including the neutrino magnetic moment for different values of neutrino mass.
In Section 3 we discuss {\it \bf the four new effects} in neutrino spin and
flavour oscillations in different background environments.


title: Saturation and forward jets at HERA

abstract:
  We analyse forward-jet production at HERA in the framework of the
Golec-Biernat and Wusthoff saturation models. We obtain a good description of
the forward jet cross sections measured by the H1 and ZEUS collaborations in
the two-hard-scale region kT ~ Q >> Lambda_QCD with two different
parametrisations with either significant or weak saturation effects. The weak
saturation parametrization gives a scale compatible with the one found for the
proton structure function F_2. We argue that Mueller-Navelet jets at the
Tevatron and the LHC could help distinguishing between both options.


title: Kahler corrections and softly broken family symmetries

abstract:
  Spontaneously broken family symmetry provides a promising origin for the
observed quark and lepton mass and mixing angle structure. In a supersymmetric
theory such structure comes from a combination of the contributions from the
superpotential and the K\"{a}hler potential. The superpotential effects have
been widely studied but relatively little attention has been given to the
effects of the K\"{a}hler sector. In this paper we develop techniques to
simplify the analysis of such K\"{a}hler effects. Using them we show that in
the class of theories with an hierarchical structure for the Yukawa couplings
the K\"{a}hler corrections to both the masses and mixing angles are
subdominant. This is true even in cases that texture zeros are filled in by the
terms coming from the K\"{a}hler potential.


title:
Statistical Pattern Recognition: Application to $\nu_{\mu}\to\nu_{\tau}$
  Oscillation Searches Based on Kinematic Criteria

abstract:
  Classic statistical techniques (like the multi-dimensional likelihood and the
Fisher discriminant method) together with Multi-layer Perceptron and Learning
Vector Quantization Neural Networks have been systematically used in order to
find the best sensitivity when searching for $\nu_\mu \to \nu_{\tau}$
oscillations. We discovered that for a general direct $\nu_\tau$ appearance
search based on kinematic criteria: a) An optimal discrimination power is
obtained using only three variables ($E_{visible}$, $P_{T}^{miss}$ and
$\rho_{l}$) and their correlations. Increasing the number of variables (or
combinations of variables) only increases the complexity of the problem, but
does not result in a sensible change of the expected sensitivity. b) The
multi-layer perceptron approach offers the best performance. As an example to
assert numerically those points, we have considered the problem of $\nu_\tau$
appearance at the CNGS beam using a Liquid Argon TPC detector.


title:
J/psi plus jet associated production in two-photon collisions at
  next-to-leading order

abstract:
  We calculate the cross section of J/psi plus jet inclusive production in
gamma gamma collisions at next-to-leading order within the factorization
formalism of nonrelativistic quantum chromodynamics (NRQCD) focusing on direct
photoproduction. Apart from direct J/psi production, we also include the
feed-down from directly-produced chi_{cJ} and psi' mesons. We discuss the
analytical calculation, in particular the treatment of the various types of
singularities and the NRQCD operator renormalization, in some detail. We
present theoretical predictions for the future e^+e^- linear collider TESLA,
taking into account both brems- and beamstrahlung.


title:
Exploring the Unitarity Triangle through CP violation observables in
  $B_s \to K^+ K^-$

abstract:
  We discuss the determination of the CKM parameters from the forthcoming $CP$
violation observables in $B_s \to K^+ K^-$ decays. Combining the information on
mixing induced CP violation in $B_s \to K^+ K^-$, with the $B_d \to J/\psi K_s$
precision observable $\sin 2\beta$ and the $B^0_s$--$\bar{B^0_s}$ mixing phase
$\phi_s$, we propose a determination of the unitarity triangle $(\bar\rho,
\bar\eta)$. Computing the penguin parameters $(r, \theta)$ within QCD
factorization yield precise determination of $(\bar\rho, \bar\eta)$, reflected
by a weak dependence on the $\theta$ which is shown as a second order effect.
The impact of the direct CP violation observable $C_{KK}$ on the penguin
parameters are investigated and a lower bound on $C_{KK}$ is extracted. We also
discuss the effect of the $B^0_s$--$\bar{B^0_s}$ new physics mixing phase on
the penguin parameters $(r, \theta)$ and $S_{KK}$. Using the SU(3)-flavour
symmetry argument and the current $B$-factories data provided by the $B_d \to
\pi^+ \pi^-$ modes, we complement the $B_s \to K^+ K^-$ CP-violating
observables in a variety of ways, in particular we find that $S_{KK}>0$.
Finally we analyze systematically the SU(3)-symmetry breaking factor within QCD
factorization.


title:
Numerical Evaluation of One-Loop Diagrams Near Exceptional Momentum
  Configurations

abstract:
  One problem which plagues the numerical evaluation of one-loop Feynman
diagrams using recursive integration by part relations is a numerical
instability near exceptional momentum configurations. In this contribution we
will discuss a generic solution to this problem. As an example we consider the
case of forward light-by-light scattering.


title: A new look at scalar mesons

abstract:
  Light scalar mesons are found to fit rather well a diquark-antidiquark
description. The resulting nonet obeys mass formulae which respect, to a good
extent, the OZI rule. OZI allowed strong decays are reasonably reproduced by a
single amplitude describing the switch of a qbar-q pair, which transforms the
state into two colourless pseudoscalar mesons. Predicted heavy states with one
or more quarks replaced by charm or beauty are briefly described; they should
give rise to narrow states with exotic quantum numbers.


title:
Relating high-energy lepton-hadron, proton-nucleus and nucleus-nucleus
  collisions through geometric scaling

abstract:
  A characteristic feature of small-x lepton-proton data from HERA is geometric
scaling -- the fact that over a wide range of x and Q^2 all data can be
described by a single variable $Q^2/Q_{sat}^2(x)$, with all x-dependence
encoded in the so-called saturation momentum $Q_{sat}(x)$. Here, we observe
that the same scaling ansatz accounts for nuclear photoabsorption cross
sections and favors the nuclear dependence $Q_{sat,A}^2\propto
A^{\alpha}Q_{sat}^2$, $\alpha \simeq 4/9$. We then make the empirical finding
that the same A-dependence accounts for the centrality evolution of the
multiplicities measured in Au+Au collisions at RHIC. It also allows to
parametrize the high-p_t particle suppression in d+Au collisions at forward
rapidities. If these geometric scaling properties have a common dynamical
origin, then this A-dependence of $Q_{sat,A}^2$ should emerge as a consequence
of the underlying dynamical model.


title:
First-Order Electroweak Phase Transition in the Standard Model with a
  Low Cutoff

abstract:
  We study the possibility of a first-order electroweak phase transition (EWPT)
due to a dimension-six operator in the effective Higgs potential. In contrast
with previous attempts to make the EWPT strongly first-order as required by
electroweak baryogenesis, we do not rely on large one-loop thermally generated
cubic Higgs interactions. Instead, we augment the Standard Model (SM) effective
theory with a dimension-six Higgs operator. This addition enables a strong
first-order phase transition to develop even with a Higgs boson mass well above
the current direct limit of 114 GeV. The phi^6 term can be generated for
instance by strong dynamics at the TeV scale or by integrating out heavy
particles like an additional singlet scalar field. We discuss conditions to
comply with electroweak precision constraints, and point out how future
experimental measurements of the Higgs self couplings could test the idea.


title:
High Energy Physics in the Atmosphere: Phenomenology of Cosmic Ray Air
  Showers

abstract:
  The properties of cosmic rays with energies above 10**6 GeV have to be
deduced from the spacetime structure and particle content of the air showers
which they initiate. In this review we summarize the phenomenology of these
giant air showers. We describe the hadronic interaction models used to
extrapolate results from collider data to ultra high energies, and discuss the
prospects for insights into forward physics at the LHC. We also describe the
main electromagnetic processes that govern the longitudinal shower evolution,
as well as the lateral spread of particles. Armed with these two principal
shower ingredients and motivation from the underlying physics, we provide an
overview of some of the different methods proposed to distinguish primary
species. The properties of neutrino interactions and the potential of
forthcoming experiments to isolate deeply penetrating showers from baryonic
cascades are also discussed. We finally venture into a terra incognita endowed
with TeV-scale gravity and explore anomalous neutrino-induced showers.


title: Constraints on New Physics from $K \to \pi \nu \bar{\nu}$

abstract:
  We study constraints on new physics from the recent measurement of Br ($K^+
\to \pi^+ \nu \bar \nu)$ by the E787 and E949 Collaborations. In our analysis
we consider two models of new physics: $(a)$ extra down type singlet quark
model (EDSQ) and $(b)$ R-parity violating Minimal Supersymmetric Standard
Model(MSSM). We find that $K^+\to \pi^+ \nu\bar \nu$ along with other processes
like $K_L \to \mu^+ \mu^-, \epsilon^\prime/\epsilon $ provide useful bounds on
the parameter $U_{sd}$, characterizing the off-diagonal $Z-d-\bar s $ coupling
of model $(a)$. The bounds on the ${\rm Re}(U_{sd})$ from $(K_L \to
\mu^+\mu^-)_{\rm SD}$ and ${\rm Im}(U_{sd})$ from $\epsilon^\prime/\epsilon$
are so tight that the branching ratio of $K^+\to \pi^+ \nu \bar \nu $ can
exceed the standard model value by at most a factor of two For model b), we
also obtain stringent bounds on certain combinations of product of two
$\lp_{ijk}$ couplings originating from $L$ number violating operator $ L_i Q_j
D^c_k $ using $K^+ \to \pi^+ \nu \bar \nu $ and $K_L \to \mu^+ \mu^-$
processes. Even with the stringent constraints on $U_{sd}$ (in model $(a)$) and
on products of two $\rp$couplings (model $(b)$), we find that the branching
ratios for $K_L \to \pi^0 \nu \bar \nu$ and $K_L \to \pi^0 e^+ e^-$ can be
substantially different in both the above models from those predicted in the
standard model.


title:
Prospects of Searches for Neutral, Long-Lived Particles which Decay to
  Photons using Timing at CDF

abstract:
  We present the prospects of searches for neutral, long-lived particles which
decay to photons using their time of arrival measured with a newly installed
timing system on the electromagnetic calorimeter (EMTiming) of the Collider
Detector at Fermilab (CDF). A Monte Carlo simulation shows that EMTiming can
provide separation between decay photons from particles with both a long
lifetime and a low boost, and prompt photons from Standard Model backgrounds.
Using a gauge mediated supersymmetry breaking (GMSB)
$\tilde{\chi}_{1}^{0}\to\gamma\tilde{G}$ model we estimate a
quasi-model-independent sensitivity using only direct neutralino pair
production, and also estimate the expected 95% confidence level exclusion
regions for all superpartner production as a function of the neutralino mass
and lifetime. We find that a combination of single photon and diphoton analyses
should allow the Tevatron in run II to easily extend the exclusion regions from
LEP II at high neutralino masses and lifetimes, and cover much, if not all, of
the theoretically favored $m_{\tilde{G}}$ < 1 keV/c^2 parameter space for
neutralino masses less than 150 GeV/c^2.


title:
Infrared structure of $e^+e^- \to 3$ jets at NNLO - the $C_F^2$
  contribution

abstract:
  We discuss the infrared structure of e+e- -> 2 and 3 jets at NNLO in QCD
perturbation theory and describe subtraction terms that render the separate
parton-level contributions finite. As a first result, we find that the NNLO
C_F^2 contribution to the first moment of the Thrust distribution <1-T> = -20.4
+/- 4.


title:
Scaling of Power Corrections for Angularities from Dressed Gluon
  Exponentiation

abstract:
  We study power corrections to a recently introduced family of event shapes,
the class of angularities, within the formalism of dressed gluon exponentiation
(DGE). We find that the universal scaling rule for the leading power
corrections deduced from resummation also holds when taking renormalon
enhancements into account. The scaling is due to boost invariance of eikonal
dynamics in the two-jet limit, which we recover in the context of DGE.
Furthermore, dressed gluon exponentiation provides an ansatz for non-leading
power corrections that violate the scaling. These non-leading corrections are
further suppressed by non-integer powers of the hard scale.


title: Is the anomalous decay ratio of D_{sJ}(2632) due to isospin breaking?

abstract:
  Quark pair annihilation into gluons is suppressed at large momenta due to the
asymptotic freedom. As a consequence, mass eigenvalues of heavy states should
be almost diagonal with respect to up and down quark masses, thereby breaking
isospin. We suggest the particle observed by the SELEX Collaboration,
D_{sJ}(2632) to be to a good extent a [cd][dbar sbar] state, which would
explain why its D^0 K^+ mode is anomalously suppressed with respect to D_s eta.
Predictions for the rates of the yet unobserved modes D_s pi^0 and D^+ K^0 are
given.


title: Precision spectroscopy with reactor anti-neutrinos

abstract:
  In this work we present an accurate parameterization of the anti-neutrino
flux produced by the isotopes 235U, 239Pu and 241Pu in nuclear reactors. We
determine the coefficients of this parameterization, as well as their
covariance matrix, by performing a fit to spectra inferred from experimentally
measured beta spectra. Subsequently we show that flux shape uncertainties play
only a minor role in the KamLAND experiment, however, we find that future
reactor neutrino experiments to measure the mixing angle $\theta_{13}$ are
sensitive to the fine details of the reactor neutrino spectra. Finally, we
investigate the possibility to determine the isotopic composition in nuclear
reactors through an anti-neutrino measurement. We find that with a 3 month
exposure of a one ton detector the isotope fractions and the thermal reactor
power can be determined at a few percent accuracy, which may open the
possibility of an application for safeguard or non-proliferation objectives.


title:
The matrix Hamiltonian for hadrons and the role of negative-energy
  components

abstract:
  The world-line (Fock-Feynman-Schwinger) representation is used for quarks in
arbitrary (vacuum and valence gluon) field to construct the relativistic
Hamiltonian. After averaging the Green's function of the white $q\bar q$ system
over gluon fields one obtains the relativistic Hamiltonian, which is matrix in
spin indices and contains both positive and negative quark energies. The role
of the latter is studied in the example of the heavy-light meson and the
standard einbein technic is extended to the case of the matrix Hamiltonian.
Comparison with the Dirac equation shows a good agreement of the results. For
arbitrary $q\bar q $ system the nondiagonal matrix Hamiltonian components are
calculated through hyperfine interaction terms. A general discussion of the
role of negative energy components is given in conclusion.


title: J/\Psi production in two-photon collisions at next-to-leading order

abstract:
  In this paper, we report on the calculation of the cross section of J/\Psi
plus jet inclusive production in direct two-photon collisions at
next-to-leading order within the factorization formalism of nonrelativistic
quantum chromodynamics (NRQCD). Theoretical predictions for the future e^+e^-
linear collider TESLA are also presented.


title:
Single and Double Peripheral Production of Sigmas in Proton Proton
  Collisions

abstract:
  The Pomeron, which dominates high energy elastic and diffractive hadronic
processes, must be largely gluonic in nature. We use a recent picture of a
scalar glueball/sigma system with coupling of the sigma to glue determined from
experiment to predict strong peripheral sigma production in the pp$\pi^0\pi^0$
and double sigma production in the pp$\pi^0\pi^0\pi^0\pi^0$ channels.


title:
Relating the ElectroWeak scale to an extra dimension: constraints from
  ElectroWeak Precision Tests

abstract:
  In models with supersymmetry breaking by boundary conditions on an extra
dimension it is possible to relate in a quantitative natural way the Fermi
scale to the size of the extra dimension. We analyze in detail the
compatibility of such models with ElectroWeak Precision Tests.


title:
Possible gravitoelectric dipole moment of neutrinos and atmospheric and
  solar neutrino anomalies

abstract:
  Quantum-mechanical calculations of transitions dynamics between the left- and
right-handed helicity states of the atmospheric muon Dirac neutrino,which has a
gravitoelectrical dipole moment (GEDM) interacting with the gravitational field
of the Earth have been carried out. It is shown that the asymmetry of the
zenith-angle distribution of an atmospheric muon neutrino can be explained by
the interference of two mutually perpendicular plain-wave neutrino states
having different velocites inside the Earth in the presence of its gravitation
field. The deficit of the solar neutrino can also be explained by the electron
neutrino helicity flip transition due to the interaction of its GEDM with the
gravitation field of the Sun. The characteristic mass for the gravitational
dipole of the neutral and charged leptons have been estimated.


title: Anomalous tqV couplings and FCNC top quark production

abstract:
  We discuss FCNC top quark production via anomalous tqV couplings at the
Tevatron and HERA colliders. We calculate higher-order soft-gluon corrections
to such processes and demonstrate the stabilization of the cross section when
these corrections are included.


title: Fast Evaluation of CTEQ Parton Distributions in Monte Carlos

abstract:
  A few changes to the routines that calculate CTEQ parton distribution
functions allow modern compilers to optimize the evaluations, while having no
quantitative effect on the results. Overall computation time is reduced by a
factor of 4-5 in matrix-element calculations, and by 1.3-2.5 in showering Monte
Carlo event generators. Similar improvements in performance may be expected in
any calculations relying heavily on interpolation or multiple calls to
functions.


title:
Universal Dynamics of Spontaneous Lorentz Violation and a New
  Spin-Dependent Inverse-Square Law Force

abstract:
  We study the universal low-energy dynamics associated with the spontaneous
breaking of Lorentz invariance down to spatial rotations. The effective
Lagrangian for the associated Goldstone field can be uniquely determined by the
non-linear realization of a broken time diffeomorphism symmetry, up to some
overall mass scales. It has previously been shown that this symmetry breaking
pattern gives rise to a Higgs phase of gravity, in which gravity is modified in
the infrared. In this paper, we study the effects of direct couplings between
the Goldstone boson and standard model fermions, which necessarily accompany
Lorentz-violating terms in the theory. The leading interaction is the coupling
to the axial vector current, which reduces to spin in the non-relativistic
limit. A spin moving relative to the "ether" rest frame will emit Goldstone
Cerenkov radiation. The Goldstone also induces a long-range inverse-square law
force between spin sources with a striking angular dependence, reflecting the
underlying Goldstone shockwaves and providing a smoking gun for this theory. We
discuss the regime of validity of the effective theory describing these
phenomena, and the possibility of probing Lorentz violations through Goldstone
boson signals in a way that is complementary to direct tests in some regions of
parameter space.


title: Hadronic Diffraction: Where do we Stand?

abstract:
  Experimental results on hadronic soft and hard diffractive processes are
reviewed with emphasis on aspects of the data that point to the underlying QCD
mechanism for diffraction. Diffractive differential cross sections are shown to
be factorized into two terms, one representing the total cross section at the
reduced energy, corresponding to the rapidity region(s) in which there is
particle production, and another interpreted as the probability of formation of
the rapidity gap(s) characterizing diffraction. By (re)normalizing the term of
gap formation probability to unity, cross sections for single, central, and
multiple rapidity gap soft diffraction, as well as structure functions for hard
diffraction processes, are obtained from the underlying inclusive parton
distribution functions. A unified partonic picture emerges, in which
diffraction appears to be mediated by the exchange of low-x partons subject to
color constraints.


title:
A Statistical Analysis of Supersymmetric Dark Matter in the MSSM after
  WMAP

abstract:
  We study supersymmetric dark matter in the general flavor diagonal MSSM by
means of an extensive random scan of its parameter space. We find that, in
contrast with the standard mSUGRA lore, the large majority of viable models
features either a higgsino or a wino-like lightest neutralino, and yields a
relic abundance well below the WMAP bound. Among the models with neutralino
relic density within the WMAP range, higgsino-like neutralinos are still
dominant, though a sizeable fraction of binos is also present. In this latter
case, relic density suppression mechanisms are shown to be essential in order
to obtain the correct neutralino abundance. We then carry out a statistical
analysis and a general discussion of neutralino dark matter direct detection
and of indirect neutralino detection at neutrino telescopes and at antimatter
search experiments. We point out that current data exclude only a marginal
portion of the viable parameter space, and that models whose thermal relic
abundance lies in the WMAP range will be significantly probed only at future
direct detection experiments. Finally, we emphasize the importance of relic
density enhancement mechanisms for indirect detection perspectives, in
particular at future antimatter search experiments.


title: A chiral model for bar{q}q and bar{q}bar{q}qq$ mesons

abstract:
  We point out that the spectrum of pseudoscalar and scalar mesons exhibits a
cuasi-degenerate chiral nonet in the energy region around 1.4 GeV whose scalar
component has a slightly inverted spectrum. Based on the empirical linear
rising of the mass of a hadron with the number of constituent quarks which
yields a mass around $1.4 $GeV for tetraquarks, we conjecture that this
cuasi-chiral nonet arises from the mixing of a chiral nonet composed of
tetraquarks with conventional bar{q}q states. We explore this possibility in
the framework of a chiral model assuming a tetraquark chiral nonet around 1.4
GeV with chiral symmetry realized directly. We stress that U_{A}(1)
transformations can distinguish bar{q}q from tetraquark states, although it
cannot distinguish specific dynamics in the later case. We find that the
measured spectrum is consistent with this picture. In general, pseudoscalar
states arise as mainly bar{q}q states but scalar states turn out to be strong
admixtures of bar{q}q and tetraquark states. We work out also the model
predictions for the most relevant couplings and calculate explicitly the strong
decays of the a_{0}(1450) and K_{0}^*(1430) mesons. From the comparison of some
of the predicted couplings with the experimental ones we conclude that
observable for the isovector and isospinor sectors are consistently described
within the model. The proper description of couplings in the isoscalar sectors
would require the introduction of glueball fields which is an important missing
piece in the present model.


title: Diffractive production at high energies in the Miettinen-Pumplin model

abstract:
  The model of soft diffractive dissociation proposed some time ago by
Miettinen and Pumplin is shown to describe correctly the data at FERMILAB
energies. The comparison with Goulianos model of renor malized pomeron flux is
also presented.


title:
Markov Chain Monte Carlo Exploration of Minimal Supergravity with
  Implications for Dark Matter

abstract:
  We explore the full parameter space of Minimal Supergravity (mSUGRA),
allowing all four continuous parameters (the scalar mass m_0, the gaugino mass
m_1/2, the trilinear coupling A_0, and the ratio of Higgs vacuum expectation
values tan beta) to vary freely. We apply current accelerator constraints on
sparticle and Higgs masses, and on the b -> s gamma branching ratio, and
discuss the impact of the constraints on g_mu-2. To study dark matter, we apply
the WMAP constraint on the cold dark matter density. We develop Markov Chain
Monte Carlo (MCMC) techniques to explore the parameter regions consistent with
WMAP, finding them to be considerably superior to previously used methods for
exploring supersymmetric parameter spaces. Finally, we study the reach of
current and future direct detection experiments in light of the WMAP
constraint.


title:
Low-x contribution to the Bjorken sum rule within double logarithmic
  $ln^2x$ approximation

abstract:
  The small-$x$ contributions to the Bjorken sum rule within double logarithmic
$ln^2x$ approximation for different input parametrisations $g_1^{NS}(x,Q_0^2)$
are presented. Analytical solutions of the evolution equations for full and
truncated moments of the unintegrated structure function $f^{NS}(x,Q^2)$ are
used. Theoretical predictions for $\int_{0}^{0.003} g_1^{NS}(x,Q^2=10) dx$ are
compared with the SMC small-$x$ data. Rough estimation of the slope $\lambda$,
controlling the small-$x$ behaviour of $g_1^{NS}\sim x^{-\lambda}$ from the SMC
data is performed. Double logarithmic terms $\sim (\alpha_s ln^2x)^n$ become
leading when $x\to 0$ and imply the singular behaviour of $g_1^{NS}\sim
x^{-0.4}$. This seems to be confirmed by recent experimental SMC and HERMES
data. Advantages of the unified $ln^2x$+LO DGLAP approach and the crucial role
of the running coupling $\alpha_s=\alpha_s(Q^2/z)$ at low-$x$ are also
discussed.


title:
Muon anomaly and a lower bound on higgs mass due to a light stabilized
  radion in the Randall-Sundrum model

abstract:
  We investigate the Randall-Sundrum model with a light stabilized radion
(required to fix the size of the extra dimension) in the light of muon
anomalous magnetic moment $a_\mu [= \frac{(g - 2)}{2}]$. Using the recent data
(obtained from the E821 experiment of the BNL collaboration) which differs by
$2.6 \sigma$ from the Standard Model result, we obtain constraints on radion
mass $\mphi$ and radion vev $\vphi$. In the presence of a radion the beta
functions $\beta(\l)$ and $\beta(g_t)$ of higgs quartic coupling ($\l$) and
top-Yukawa coupling ($g_t$) gets modified. We find these modified beta
functions. Using these beta functions together with the anomaly constrained
$\mphi$ and $\vphi$, we obtain lower bound on higgs mass $m_h$. We compare our
result with the present LEP2 bound on $m_h$.


title: Pentaquark masses: another look

abstract:
  This paper has been withdrawn by the author(s). Please see arXiv:0711.3910
for revision.


title:
Electromagnetic form factors of pion and rho in the three forms of
  relativistic kinematics

abstract:
  The electromagnetic form factors of the $\pi$ and the $\rho$ are obtained
using the three forms of relativistic kinematics, instant form, point form and
(light) front form. Simple representations of the mass operator together with
single quark currents are employed with all the forms. The Poincar\'e covariant
current operators are generated by the dynamics from single-quark currents that
are covariant under the kinematic subgroup. Front and instant forms allow to
reproduce the available data for the pion form factor. On the other hand point
form is not able to reproduce qualitatively the experimental data with
reasonable values for the wave function parameters. For the $\rho$
electromagnetic form factors, instant and front forms provide a consistent
picture. The obtained results do not depend appreciably on the wave function
used.


title:
Mathematical Structure of Anomalous Dimensions and QCD Wilson
  Coefficients in Higher Order

abstract:
  The alternating and non-alternating harmonic sums and other algebraic objects
of the same equivalence class are connected by algebraic relations which are
induced by the product of these quantities and which depend on their index
class rather than on their value. We show how to find a basis of the associated
algebra. The length of the basis $l$ is found to be $\leq 1/d$, where $d$ is
the depth of the sums considered and is given by the 2nd {\sc Witt} formula. It
can be also determined counting the {\sc Lyndon} words of the respective index
set. There are two further classes of relations: structural relations between
{\sc Nielsen}--type integrals and relations due to the specific structure of
{\sc Feynman} diagrams which lead to a considerable reduction of the set of
basic functions. The relations derived can be used to simplify results of
higher order calculations in QED and QCD. We also report on results calculating
the 16th non--singlet moment of unpolarized structure functions at 3--loop
order in the $\bar{\rm MS}$ scheme.


title:
NNLO coefficient functions of Higgs and Drell--Yan cross sections in
  Mellin space

abstract:
  We calculate the Mellin moments of next-to-next-to-leading order coefficient
functions of the Drell-Yan and Higgs production cross sections. The results can
be expressed in term of finite harmonic sums which are maximally threefold up
to weight four. Various algebraic relations among these finite sums reduce the
complexity of the results suitable for fast numerical evaluations. It is shown
that only five non--trivial functions occur besides Euler's $\psi$--function in
the representation of these Wilson coefficients.


title:
Color Glass Condensate in Brane Models or Don't Ultra High Energy Cosmic
  Rays Probe $10^{15}eV$ Scale ?

abstract:
  In a previous work hep-ph/0203165 we have studied propagation of relativistic
particles in the bulk for some of most popular brane models. Constraints have
been put on the parameter space of these models by calculating the time delay
due to propagation in the bulk of particles created during the interaction of
Ultra High Energy Cosmic Rays with protons in the terrestrial atmosphere. The
question was however raised that probability of hard processes in which bulk
modes can be produced is small and consequently, the tiny flux of UHECRs can
not constrain brane models. Here we use Color Glass Condensate (CGC) model to
show that effects of extra dimensions are visible not only in hard processes
when the incoming particle hits a massive Kaluza-Klein mode but also through
the modification of soft/semi-hard parton distribution. At classical level, for
an observer in the CM frame of UHECR and atmospheric hadrons, color charge
sources are contracted to a thin sheet with a width inversely proportional to
the energy of the ultra energetic cosmic ray hadron and consequently they can
see an extra dimension with comparable size. Due to QCD interaction a short
life swarm of partons is produced in front of the sheet and its partons can
penetrate to the extra-dimension bulk. This reduces the effective density of
partons on the brane or in a classical view creates a delay in the arrival of
the most energetic particles if they are reflected back due to the warping of
the bulk. In CGC approximation the density of swarm at different distance from
the classical sheet can be related and therefore it is possible (at least
formally) to determine the relative fraction of partons in the bulk and on the
brane at different scales. Results of this work are also relevant to the test
of brane models in hadron colliders like LHC.


title:
Static quantities of a neutral bilepton in the 331 model with
  right-handed neutrinos

abstract:
  A neutral vector boson can possess static electromagnetic properties provided
that the associated field is no self-conjugate. This possibility is explored in
the $SU_C(3) X SU_L(3) X U_N(1)$ model with right-handed neutrinos, which
predicts a complex neutral gauge boson $Y^0$ in a nontrivial representation of
the electroweak group. In this model the only nonvanishing form factors are the
CP-even ones, which arise from both the quark and gauge sectors, and contribute
to the magnetic dipole and the electric quadrupole moments of this neutral
particle.


title:
Tau tau Fusion to SUSY Higgs Bosons at a Photon Collider: Measuring
  tan(beta)

abstract:
  Tau tau fusion to light h and heavy H,A Higgs bosons is investigated in the
Minimal Supersymmetric Standard Model (MSSM) at a photon collider as a
promising channel for measuring large values of tan(beta). For standard design
parameters of a photon collider an error close to unity, uniform for tan(beta)
above 10, may be expected, improving on complementary measurements at LHC and
e+e- linear colliders.


title: Chromomagnetic instability in dense quark matter

abstract:
  The results for the Debye and Meissner screening masses of the gluons and the
photon in the case of neutral and beta-equilibrated dense two-flavor quark
matter are presented. In the limits of the normal phase and the ideal
two-flavor color superconducting phase, the screening masses coincide with the
known results. Most interestingly, we find that the Meissner screening masses
squared can be negative, indicating a plasma-type chromomagnetic instability in
dense quark matter.


title: $B_d - \bar{B}_d$ mass difference in Little Higgs model

abstract:
  An alternate solution of hierarchy problem in the Standard Model namely, the
Little Higgs model, has been proposed lately. In this work $B_d^0-\bar{B_d^0}$
mass difference in the framework of the Little Higgs model is evaluated. The
experimental limits on the mass difference is shown to provide meaningful
constraints on the parameter space of the model.


title:
NLO Corrections to the \gamma* Impact Factor: First Numerical Results
  for the Real Corrections to \gamma*_L

abstract:
  We analytically perform the transverse momentum integrations in the real
corrections to the longitudinal \gamma*_L impact factor. The resulting
integrals are Feynman parameter integrals, and we provide a MATHEMATICA file
which contains the integrands. The remaining integrals are carried out
numerically. We perform a numerical test, and we compute those parts of the
impact factor which depend upon the energy scale s_0: they are found to be
negative and, with decreasing values of s_0, their absolute value increases.


title:
One-loop effective action of QCD at high temperature using the heat
  kernel method

abstract:
  Perturbation theory is an important tool to describe the properties of QCD at
very high temperatures. Recently a new technique has been proposed to compute
the one-loop effective action of QCD at finite temperature by making a gauge
covariant derivative expansion, which is fully consistent with topologically
small and large gauge transformations (also time dependent transformations).
This technique is based on the heat kernel expansion, and the thermal Wilson
line plays an essential role. We consider a general SU(N_c) gauge group.