title: Experimental tests on the lifetime Asymmetry

abstract:
  The experimental test problem of the left-right polarization-dependent
lifetime asymmetry is discussed. It shows that the existing experiments cannot
demonstrate the lifetime asymmetry to be right or wrong after analyzing the
measurements on the neutron, the muon and the tau lifetime, as well as the
$g-2$ experiment. However, It is pointed out emphatically that the SLD and the
E158 experiments, the measurements of the left-right integrated cross section
asymmetry in $Z$ boson production by $e^+e^-$ collisions and by
electron-electron M{\o}ller scattering, can indirectly demonstrate the lifetime
asymmetry. In order to directly demonstrate the lifetime asymmetry, we propose
some possible experiments on the decays of polarized muons. The precise
measurement of the lifetime asymmetry could have important significance for
building a muon collider, also in cosmology and astrophysics. It would provide
a sensitive test of the standard model in particle physics and allow for
exploration of the possible $V+A$ interactions.


title: Automated Resummation and Hadron Collider Event Shapes

abstract:
  This writeup gives an introduction to the theoretical understanding that lies
behind automated resummation. It then discusses its applications to
hadron-collider event shapes.


title: V+A and V-A Correlators at Large NC: From OPE to Resonance Theory

abstract:
  The spin-1 correlators are analysed in this talk through a large NC resonance
theory. The matching to perturbative QCD and the first terms in the OPE
constrains the hadronic parameters. A further sum-rule analysis shows the wider
range of validity of the resonance description, which can help to discern the
proper structure of the QCD mass spectrum.


title:
Using Invisible Graviton Radiation to Detect Heavy Electroweak
  Resonances at a 500 GeV e+e- Collider

abstract:
  The process e+e- --> mu+ mu- + missing E_T, where the missing energy is due
to the production of a tower of invisible graviton states in a model with large
extra dimensions, is considered. We focus on the scenario when this process is
used to detect a heavy dileptonic resonance in the electroweak sector of the
model, taking as example some models with an extra Z' boson. It turns out that
at a 500 GeV machine with 1000 inverse fb of luminosity, it may be possible to
use this process to such detect resonances if there are two large extra
dimensions and the string scale is not too far above a TeV.


title:
K -> 3 pi Final State Interactions at NLO in CHPT and Cabibbo's Proposal
  to Measure a_0-a_2

abstract:
  We present the analytical results for the K -> 3 pi final state interactions
at next-to-leading order (NLO) in CHPT. We also study the recent Cabibbo's
proposal to measure the pi-pi scattering lenghts combination a_0-a_2 from the
cusp effect in the pi^0-pi^0 energy spectrum at threshold for K^+ -> pi^0 pi^0
pi^+ and K_L -> pi^0 pi^0 pi^0$, and give the relevant formulas to describe it
at NLO. For that, we use the NLO CHPT expression to fit the real part of K -> 3
pi to data while the pi-pi scattering lenghts are treated non-perturbatively.
Using them, we make a quantitative estimate of the theoretical uncertaintity of
the a_0-a_2 determination at NLO in our approach and obtain that it is not
smaller than 5 % if added quadratically and 7 % if linearly for K^+ -> pi^0
pi^0 pi^+. One gets similar theoretical uncertainties if the neutral K_L ->
pi^0 pi^0 pi^0 decay data below threshold are used instead. For this decay,
there are very large theoretical uncertainties above threshold due to
cancellations and data above threshold cannot be used to get the scattering
lenghts. All the numbers we present are in the isospin limit apart of two-pion
phase space factors which are physical. We compare our results for the cusp
effect with Cabibbo and Isidori's results and discuss the differences and
agreements.
  We also comment on the apperance of the singularity at the K -> 3 pi
pseudo-threshold s=(m_K-m_pi)^2 in the discontinuity that defines the cusp.


title: Gravitational collapse of a susy star

abstract:
  The evidence for a positive vacuum energy in our universe suggests that we
might be living in a false vacuum destined to ultimately decay to a true vacuum
free of dark energy. At present the simplest example of such a universe is one
that is exactly supersymmetric (susy). It is expected that the nucleation rate
of critically sized susy bubbles will be enhanced in regions of high density
such as in degenerate stars. The consequent release of energy stored in Pauli
towers provides a possible model for gamma ray bursts. Whether or not all or
any of the currently observed bursts are due to this mechanism, it is important
to define the signatures of this susy phase transition. After such a burst, due
to the lifting of degeneracy pressure, the star would be expected to collapse
into a black hole even though its mass is below the Chandrasekhar limit.
Previous studies have treated the star as fully releasing its stored energy
before the collapse. In this article we make an initial investigation of the
effects of the collapse during the gamma ray emission.


title:
New Applications of Resummation in Non-Abelian Gauge Theories: QED X QCD
  Exponentiation for LHC Physics, IR-Improved DGLAP Theory and Resummed Quantum
  Gravity

abstract:
  We present the elements of three applications of resummation methods in
non-Abelian gauge theories: (1), QED X QCD exponentiation and shower/ME
matching for LHC physics; (2), IR improvement of DGLAP theory; (3), resummed
quantum gravity and the final state of Hawking radiation. In all cases, the
extension of the YFS approach, originally introduced for Abelian gauge theory,
to non-Abelian gauge theories, QCD and quantum general relativity, leads to new
results and solutions which we briefly summarize.


title:
Azimuthal correlation between the $(\vec{p}_l,\vec{p}_{X_b})$ and
  $(\vec{p}_l,\vec{P}_t)$ planes in the semileptonic rest frame decay of a
  polarized top quark: An $O(\alpha_s)$ effect

abstract:
  The azimuthal correlation between the planes formed by the vectors
  $(\vec{p}_\ell,\vec{p}_{X_b})$ and $(\vec{p}_\ell,\vec{P}_t)$ in the
semileptonic rest frame decay of a polarized top quark $t(\uparrow) \to X_b +
l^+ + \nu_\ell$ belongs to a class of polarization observables involving the
top quark which vanish at the Born term level in the standard model. We
determine the next--to--leading order QCD corrections to the afore-mentioned
azimuthal correlation and compare the result to the corresponding contribution
of a non--standard--model right--chiral quark current.


title: Right-handed Sneutrinos as Nonthermal Dark Matter

abstract:
  When the minimal supersymmetric standard model is augmented by three
right-handed neutrino superfields, one generically predicts that the neutrinos
acquire Majorana masses. We postulate that all supersymmetry (SUSY) breaking
masses as well as the Majorana masses of the right-handed neutrinos are around
the electroweak scale and, motivated by the smallness of neutrino masses,
assume that the lightest supersymmetric particle (LSP) is an almost-pure
right-handed sneutrino. We discuss the conditions under which this LSP is a
successful dark matter candidate. In general, such an LSP has to be nonthermal
in order not to overclose the universe, and we find the conditions under which
this is indeed the case by comparing the Hubble expansion rate with the rates
of the relevant thermalizing processes, including self-annihilation and
co-annihilation with other SUSY and standard model particles.


title: A Markov Chain Monte Carlo Analysis of the CMSSM

abstract:
  We perform a comprehensive exploration of the Constrained MSSM parameters
using a Markov Chain Monte Carlo technique and a Bayesian analysis. We compute
superpartner masses and other collider observables as well as a cold dark
matter abundance, and compare them with experimental data. We include
uncertainties arising from theoretical approximations as well as from residual
experimental errors on relevant SM parameters. We delineate probability
distributions of the CMSSM parameters, the collider and cosmological
observables as well as a dark matter direct detection cross section. The 68%
probability intervals of the CMSSM parameters are: 0.52 TeV < m_{1/2} < 1.26
TeV, m_0 <2.10 TeV, -0.34 TeV < A_0 < 2.41 TeV and 38.5< tan(beta) <54.6.
Generally, large fractions of high probability ranges of the superpartner
masses will be probed at the LHC. We highlight a complementarity between LHC
and WIMP dark matter searches in exploring the CMSSM parameter space. We
further expose a number of correlations among the observables, in particular
between BR(B_s \to \mu^+ \mu^-) and BR({\bar B}\to X_s\gamma) or sigma_p^{SI}.
Once SUSY is discovered, this and other correlations may prove helpful in
distinguishing the CMSSM from other supersymmetric models. The robustness of
our results is investigated in terms of the assumed ranges of CMSSM parameters
and the effect of the (g-2)_mu anomaly which shows some tension with the other
observables. We find that the results for m_0, and the observables which
strongly depend on it, are sensitive to our assumptions, while our conclusions
for the other variables are robust.


title:
Bosonic corrections to the effective leptonic weak mixing angle at the
  two-loop level

abstract:
  Details of the recent calculation of the two-loop bosonic corrections to the
effective leptonic weak mixing angle are presented. In particular, the
expansion in the difference of the W and Z boson masses is studied and some of
the master integrals needed are given in analytic form.


title:
Virtual Corrections to Bremsstrahlung in High-Energy Collider Physics:
  LHC and e+ e- Colliders

abstract:
  We describe radiative corrections to bremsstrahlung and their application to
high energy collider physics, focusing on the applications to luminosity
measurement, fermion pair production and radiative return. We review the status
of one loop radiative corrections in BHLUMI and the KKMC, including cross
checks with newer results developed independently for radiative return. We
outline a YFS-exponentiated approach to the Drell-Yan process for LHC physics,
including a discussion of the relevant radiative corrections.


title: Matching Parton Showers and Matrix Elements

abstract:
  We compare different procedures for combining fixed-order tree-level matrix
element generators with parton showers. We use the case of W-production at the
Tevatron and the LHC to compare different implementations of the so-called CKKW
scheme and one based on the so-called MLM scheme using different matrix element
generators and different parton cascades. We find that although similar results
are obtained in all cases, there are important differences.


title: Beam Cooling with ionisation losses

abstract:
  A novel type of particle "cooling", called Ionization Cooling, is applicable
to slow (v of the order of 0.1c) ions stored in a small ring. The many
traversals through a thin foil enhance the nuclear reaction probability, in a
steady configuration in which ionisation losses are recovered at each turn by a
RF-cavity. For a uniform target "foil" the longitudinal momentum spread
diverges exponentially since faster (slower) particles ionise less (more) than
the average. In order to "cool" also longitudinally, a chromaticity has to be
introduced with a wedge shaped "foil". Multiple scattering and straggling are
then "cooled" in all three dimensions, with a method similar to the one of
synchrotron cooling, but valid for low energy ions. Particles then stably
circulate in the beam indefinitely, until they undergo for instance nuclear
processes in the thin target foil. This new method is under consideration for
the nuclear production of a few MeV/A ion beams. Simple reactions, for instance
Li 7 + D Li 8 + p, are more favourably exploited with the heavier ion colliding
against a gas-jet D2 target. Kinematics is generally very favourable, with
emission angles in a narrow angular cone and a relatively concentrated outgoing
energy spectrum which allows an efficient collection as a neutral gas in a tiny
volume with a technology at high temperatures perfected at ISOLDE. It is
however of a much more general applicability. The method appears capable of
producing a "table top" storage ring with an accumulation rate in excess of
10**14 Li-8 radioactive ion/s for possible use for radioactive beams for
physics studies (for example for beta-beams) or for therapy.


title:
Quantum-Mechanical Description of the Electromagnetic Interaction of
  Relativistic Particles with Electric and Magnetic Dipole Moments

abstract:
  The Hamiltonian of relativistic particles with electric and magnetic dipole
moments that interact with an electromagnetic field is determined in the
Foldy-Wouthuysen representation. Transition to the semiclassical approximation
is carried out. The quantum-mechanical and semiclassical equations of spin
motion are derived.


title:
Landau Pole and the Nature of $1/N_f$ Expansion Series in Quantum
  Electrodynamics

abstract:
  This paper has been withdrawn by the author because the arguments presented
in the paper is incomplete.


title:
Flavor Changing Neutral Currents involving Heavy Quarks with Four
  Generations

abstract:
  We study various FCNC involving heavy quarks in the Standard Model (SM) with
a sequential fourth generation. After imposing $B\to X_s\gamma$, $B\to
X_sl^+l^-$ and $Z\to b\bar{b}$ constraints, we find ${\cal B}(Z\to
s\bar{b}+\bar{s}b)$ can be enhanced by an order of magnitude to $10^{-7}$,
while $t\to cZ, cH$ decays can reach $10^{-6}$, which are orders of magnitude
higher than in SM. However,these rates are still not observable for the near
future.With the era of LHC approaching, we focus on FCNC decays involving
fourth generation $b^\prime$ and $t^\prime$ quarks. We calculate the rates for
loop induced FCNC decays $b^\prime\to bZ, bH, bg, b\gamma$, as well as
$t^\prime\to tZ,\tH, tg, t\gamma$. If $|V_{cb'}|$ is of order $|V_{cb}| \simeq
0.04$, tree level $b^\prime\to cW$ decay would dominate, posing a challenge
since $b$-tagging is less effective. For $|V_{cb'}| \ll |V_{cb}|$, $b'\to tW$
would tend to dominate, while $b'\to t^\prime W^*$ could also open for heavier
$b'$, leading to thepossibility of quadruple-$W$ signals via $b'\bar b'\to
b\bar b W^+W^-W^+W^-$. The FCNC $b'\to bZ, bH$ decays could still dominate if
$m_{b'}$ is just above 200 GeV. For the case of $t'$, ingeneral $t^\prime\to
bW$ would be dominant, hence it behaves like a heavy top. For both $b'$ and
$t'$, except for the intriguing light $b'$ case, FCNC decays are in the
$10^{-4} -10^{-2}$ range, and are quite detectable at the LHC.For a possible
future ILC, we find the associated production of FCNC $e^+e^-\to b\bar s$,
$t\bar c$ are below sensitivity, while $e^+e^-\to b^\prime\bar b$
and$t^\prime\bar t$ can be better probed.Tevatron Run-II can still probe the
lighter $b'$ or $t'$ scenario. LHC would either discover the fourth generation
and measure the FCNC rates, or rule out the fourth generation conclusively.


title: Photon: history, mass, charge

abstract:
  The talk consists of three parts. ``History'' briefly describes the emergence
and evolution of the concept of photon during the first two decades of the 20th
century. ``Mass'' gives a short review of the literature on the upper limit of
the photon's mass. ``Charge'' is a critical discussion of the existing
interpretation of searches for photon charge. Schemes, in which all photons are
charged, are grossly inconsistent. A model with three kinds of photons
(positive, negative and neutral) seems at first sight to be more consistent,
but turns out to have its own serious problems.


title: The Concept of Mass in the Einstein Year

abstract:
  Various facets of the concept of mass are discussed. The masses of elementary
particles and the search for higgs. The masses of hadrons. The pedagogical
virus of relativistic mass.


title:
Gauge and Lorentz Covariant Schwinger-Dyson Equation for Fermion
  Propagator in Arbitrary External Gauge Field

abstract:
  A formalism of gauge and Lorentz covariant Schwinger-Dyson equation is built
up for fermion propagator in presence of arbitrary external gauge field within
ladder approximation. Different type external electromagnetic field dependent
trial solutions are investigated which spontaneously breaking chiral symmetry.


title: Light diffraction by a strong standing electromagnetic wave

abstract:
  The nonlinear quantum interaction of a linearly polarized x-ray probe beam
with a focused intense standing laser wave is studied theoretically. Because of
the tight focusing of the standing laser pulse, diffraction effects arise for
the probe beam as opposed to the corresponding plane wave scenario. A
quantitative estimate for realistic experimental conditions of the ellipticity
and the rotation of the main polarization plane acquired by the x-ray probe
after the interaction shows that the implementation of such vacuum effects is
feasible with future X-ray Free Electron Laser light.


title: Higgs Boson Mass From Orbifold GUTs

abstract:
  We consider a class of seven-dimensional N=1 supersymmetric orbifold GUTs in
which the Standard Model (SM) gauge couplings and one of the Yukawa couplings
(top quark, bottom quark or tau lepton) are unified, without low energy
supersymmetry, at M_{GUT} \simeq 4 \times 10^{16} GeV. With gauge-top quark
Yukawa coupling unification the SM Higgs boson mass is estimated to be 135 \pm
6 GeV, which increases to 144 \pm 4 GeV for gauge-bottom quark (or gauge-tau
lepton) Yukawa coupling unification.


title:
Quark-hadron duality and production of charmonia and doubly charmed
  baryons in e+e- annihilation

abstract:
  In the framework of quark-hadron duality, the cross section values of
charmonium and doubly charmed baryon production in $e^+e^-$-annihilations have
been estimated at interaction energy $\sqrt{s}=10.6$ GeV. It has been shown
that the approach under discussion allows to resolve some contradictions
between the experimental data and pQCD predictions.


title:
On the Khalfin's improvement of the LOY effective Hamiltonian for
  neutral meson complex

abstract:
  The general properties of the effective Hamiltonian for neutral meson system
improved by L.A. Khalfin in 1980 are studied. It is shown that contrary to the
standard result of the Lee--Oehme--Yang (LOY) theory, the diagonal matrix
elements of this effective Hamiltonian can not be equal in a CPT invariant
system. It is also shown that the scalar product of short, $|K_{S}>$, and long,
$|K_{L}>$, living superpositions of neutral kaons can not be real when CPT
symmetry is conserved in the system under considerations whereas within the LOY
theory such a scalar product is real.


title: Testing Fundamental Symmetries with \Lambda_b \to \Lambda -Vector Decay

abstract:
  Putting together kinematical and dynamical analysis, a complete study of the
decay channels $\Lambda_b \to {\Lambda} V(1^-)$, with $\Lambda \to p {\pi}^-$
and $V (J/\psi) \to {\ell}^+ {\ell}^-$ or $V ({\rho}^0) \to {\pi}^+ {\pi}^-,$
is performed. An intensive use of the helicity formalism is involved on the
kinematical side, while on the dynamical side, Heavy Quark Effective Theory
(HQET) is applied for an accurate determination of the hadronic matrix elements
between the baryons $\Lambda_b$ and $\Lambda$. Emphasis is put on the major
role of the $\Lambda_b$ polarization for constructing T-odd observables and the
standard ${\rho}^0-{\omega}$ mixing has the benefit effect of amplifying the
process of direct CP violation between $\Lambda_b \mathrm{and} {\bar
\Lambda}_b$ decays.


title:
Finite Temperature Spectral Densities of Momentum and R-Charge
  Correlators in $\N=4$ Yang Mills Theory

abstract:
  We compute spectral densities of momentum and R-charge correlators in thermal
$\N=4$ Yang Mills at strong coupling using the AdS/CFT correspondence. For
$\omega \sim T$ and smaller, the spectral density differs markedly from
perturbation theory; there is no kinetic theory peak. For large $\omega$, the
spectral density oscillates around the zero-temperature result with an
exponentially decreasing amplitude. Contrast this with QCD where the spectral
density of the current-current correlator approaches the zero temperature
result like $(T/\omega)^4$. Despite these marked differences with perturbation
theory, in Euclidean space-time the correlators differ by only $\sim 10%$ from
the free result. The implications for Lattice QCD measurements of transport are
discussed.


title:
Through the blackness -- high p_T hadrons probing the central region of
  200 AGeV Au-Au collisions

abstract:
  The energy loss of high p_T partons propagating through a hot and dense
medium is regarded as a valuable tool to probe the medium created in
ultrarelativistic heavy-ion collisions. The angular correlation pattern of
hadrons associated with a hard trigger in the region of p_T ~1-2 GeV which
exhibits a dip in the expected position of the away side jet has given rise to
the idea that energy is lost predominantly to propagating collective modes
('Mach cones'). Recent measurements by the STAR collaboration have shown that
for a high p_T > 8 GeV trigger the angular pattern of associate hadrons for p_T
> 4 GeV shows the emergence of the expected away side peak. These di-jet events
suggest that the away side parton may emerge occasionally without substantial
energy loss. Since in such a back-to-back configuration one of the partons may
travel through the central region of the fireball, the average in-medium
pathlength is substantial and the expected energy loss is not only sensitive to
the initial geometry of matter but also to the change of geometry due to
expansion. We show that radiative energy loss is able to explain the dijet
events provided that the expansion of the medium is taken into account.


title:
Recoilless Resonant Absorption of Monochromatic Neutrino Beam for
  Measuring Delta m^2_{31} and theta_{13}

abstract:
  We discuss, in the context of precision measurement of Delta m^2_{31} and
theta_{13}, physics capabilities enabled by the recoilless resonant absorption
of monochromatic antineutrino beam enhanced by the M\"ossbauer effect recently
proposed by Raghavan. Under the assumption of small relative systematic error
of a few tenth of percent level between measurement at different detector
locations, we give analytical and numerical estimates of the sensitivities to
Delta m^2_{31} and sin^2 2theta_{13}. The accuracies of determination of them
are enormous; The fractional uncertainty in Delta m^2_{31} achievable by 10
point measurement is 0.6% (2.4%) for sin^2 2theta_{13} = 0.05, and the
uncertainty of sin^2 2theta_{13} is 0.002 (0.008) both at 1 sigma CL with the
optimistic (pessimistic) assumption of systematic error of 0.2% (1%). The
former opens a new possibility of determining the neutrino mass hierarchy by
comparing the measured value of Delta m^2_{31} with the one by accelerator
experiments, while the latter will help resolving the theta_{23} octant
degeneracy.


title:
The processes $e^+ e^-\to J/ \Psi \chi_{c0}, \Psi(2S) \chi_{c0}$ at
  $\sqrt s = 10.6$GeV in the framework of light cone formalism

abstract:
  In this paper we have analyzed the production of pair charmonium mesons in
the reactions $e^+ e^- \to J/ \Psi \chi_{c0}, e^+ e^-\to \Psi(2S) \chi_{c0}$ at
energy $\sqrt s = 10.6$GeV in the framework of the light cone formalism. In
comparison with NRQCD the numerical results for the cross sections are in
better agreement with experiment.


title:
Systematics of heavy quarkonia from Regge trajectories on $(n,M^2)$ and
  $(M^2,J)$ planes

abstract:
  In this paper we show that heavy quarckonium states, similar to light mesons,
form Regge trajectories in $(n,M^2)$ and $(M^2,J)$ planes and the slope of
these trajectories is independent on the quantum numbers of the mesons. This
fact can be useful for the prediction of the masses of heavy quarkonia and the
determination of the quantum numbers of the newly discovered states.


title: Neutralino-neutralino annihilation to gammaZ in MSSM

abstract:
  The 1-loop computation of the processes $\tchi_i \tchi_j \to \gamma Z$ has
been performed at an arbitrary c.m. energy for any pair of MSSM neutralinos. As
an application suitable for Dark Matter (DM) searches, the
neutralino-neutralino annihilation is studied at the limiting case of vanishing
relative velocity, describing the present DM distribution in the galactic halo;
and at a relative velocity of about 0.5, determining the neutralino relic
density contributions. The most useful situation is obviously for $i=j=1$, but
the case of non-identical neutralinos may also be useful in some corners of the
parameter space. Our results are contained in the FORTRAN code PLATONdmgZ,
applying to any set of real MSSM parameters. Numerical results are also
presented for a sample of 6 MSSM models, describing the various possible
neutralino properties. A comparison with other existing works is also made.


title: Exclusive semileptonic and nonleptonic decays of the Bc meson

abstract:
  We study exclusive nonleptonic and semileptonic decays of the Bc-meson within
a relativistic constituent quark model previously developed by us. For the
nonleptonic decays we use the factorizing approximation. We update our model
parameters by using new experimental data for the mass and the lifetime of the
Bc meson and the leptonic decay constants of the D-meson. We calculate the
branching ratios for a large set of exclusive nonleptonic and semileptonic
decays of the $B_c$ meson and compare our results with the results of other
studies. As a guide for further experimental exploration we provide explicit
formulas for the full angular decay distributions in the cascade decays Bc^- =>
J/psi(=> l^+l^-) + rho^-(=> pi^- pi^0) and Bc^- => J/psi(=> l^+l^-) +
W^-(off-shell)(=> l^- + nubar).


title: Critical Opalescence in Baryonic QCD Matter

abstract:
  We show that critical opalescence, a clear signature of second-order phase
transition in conventional matter, manifests itself as critical intermittency
in QCD matter produced in experiments with nuclei. This behaviour is revealed
in transverse momentum spectra as a pattern of power laws in factorial moments,
to all orders, associated with baryon production. This phenomenon together with
a similar effect in the isoscalar sector of pions (sigma mode) provide us with
a set of observables associated with the search for the QCD critical point in
experiments with nuclei at high energies.


title: Right-handed neutrinos as the source of density perturbations

abstract:
  We study the possibility that cosmological density perturbations are
generated by the inhomogeneous decay of right-handed neutrinos. This will occur
if a scalar field whose fluctuations are created during inflation is coupled to
the neutrino sector. Robust predictions of the model are a detectable level of
non-Gaussianity and, if standard leptogenesis is the source of the baryon
asymmetry, a baryon isocurvature perturbations at the level of the present
experimental constraints.


title: Quasi-Elastic Neutrino-Nucleus Reactions

abstract:
  The quasi-elastic contribution of the nuclear inclusive electron scattering
model developed in A. Gil, J. Nieves, and E. Oset: Nucl. Phys. A 627 (1997)
543; is extended to the study of electroweak Charged Current (CC) induced
nuclear reactions at intermediate energies of interest for future neutrino
oscillation experiments. The model accounts for long range nuclear (RPA)
correlations, Final State Interaction and Coulomb corrections. RPA correlations
are shown to play a crucial role in the whole range of neutrino energies, up to
500 MeV, studied in this work. Predictions for inclusive muon capture for
different nuclei, and for the reactions $^{12}$C$(\nu_\mu,\mu^-)X$ and
$^{12}$C$(\nu_e,e^-)X$ near threshold are also given.


title:
Implementation of the Multiple Point Principle in the Two-Higgs Doublet
  Model of type II

abstract:
  The multiple point principle (MPP) is applied to the non--supersymmetric
two-Higgs doublet extension of the Standard Model (SM). The existence of a
large set of degenerate vacua at some high energy scale caused by the MPP
results in a few relations between Higgs self-coupling constants which can be
examined at future colliders. The numerical analysis reveals that these MPP
conditions constrain the mass of the SM--like Higgs boson to lie below 180 GeV
for a wide set of MPP scales $\Lambda$ and $\tan\beta$.


title: Family Unification, Exotic States and Light Magnetic Monopoles

abstract:
  Models with fermions in bifundamental representations can lead naturally to
family unification as opposed to family replication. Such models typically
predict (exotic) color singlet states with fractional electric charge, and
magnetic monopoles with multiple Dirac charge. The exotics may be at the TeV
scale, and relatively light magnetic monopoles (greater than about 10^7 GeV)
can be present in the galaxy with abundance near the Parker bound. We focus on
three family SU(4)XSU(3)XSU(3) models.


title:
Mixing among the neutral Higgs bosons and rare B decays in the CP
  violating MSSM

abstract:
  Considering corrections from two-loop Feynman diagrams which involve gluino
at large $\tan\beta$, we analyze the effects of possible CP phases on the rare
B decays: $\bar{B}_{_{s}} \to l^+l^-$ and $\bar{B}\to Kl^+l^-$ in the CP
violating minimal supersymmetric extension of the standard model. It is shown
that the results of exact two loop calculations obviously differ from that
including one-loop contributions plus threshold radiative corrections. The
numerical analysis indicates that the possibly large CP phases strongly affect
the theoretical estimation of the branching ratios, and this results coincide
with the conclusion of some other works appearing in recent literature.


title: The convolution model of unstable particles

abstract:
  Quantum field model of unstable particles with random mass is suggested to
describe the finite-width effects in decay rate. Within the framework of this
model we derive the convolution formula for a width of the channels with
unstable particle in a final state. The distribution function of random mass is
considered for ustable particles of arbitrary type


title: Primordial Neutrinos

abstract:
  The connection between cosmological observations and neutrino physics is
discussed in detail. Neutrinos decouple from thermal contact in the early
Universe at a temperature of order 1 MeV which coincides with the temperature
where light element synthesis occurs. Observation of light element abundances
therefore provides important information on such properties as neutrino energy
density and chemical potential. Precision observations of the cosmic microwave
background and large scale structure of galaxies can be used to probe neutrino
masses with greater precision than current laboratory experiments. In this
review I discuss current cosmological bounds on neutrino properties, as well as
possible bounds from upcoming measurements.


title:
Estimating Renyi entropies of a multiparticle system from event-by-event
  fluctuations

abstract:
  Recent improvements in the method of estimating Renyi entropies from
measurements of coincidences between the events observed in high energy
collisions are reviewed. A new, more precise, formulation of the method is
presented and its accuracy analysed.


title:
Looking for Delta I = 5/2 amplitude components in B -> pi pi and B ->
  rho rho experiments

abstract:
  We discuss how experiments measuring B -> pi pi and B -> rho rho may be used
to search for a Delta I = 5/2 amplitude component. This component could be the
explanation for a recent (albeit very tentative) hint from B(Bbar) -> rho rho
decays that the isospin triangles do not close.


title: Moduli-Induced Gravitino Problem

abstract:
  We investigate the cosmological moduli problem by studying a modulus decay in
detail and find that the branching ratio of the gravitino production is
generically of O(0.01-1), which causes another cosmological disaster.
Consequently, the cosmological moduli problem cannot be solved simply by making
the modulus mass heavier than 100 TeV. We also illustrate our results by
explicitly calculating the branching ratio into the gravitinos in the mixed
modulus--anomaly/KKLT- and racetrack-type models.


title: Quark-lepton complementarity with quasidegenerate Majorana neutrinos

abstract:
  A basis independent formulation of quark-lepton complementarity is
implemented at a high scale for quasidegenerate Majorana neutrinos. It is shown
that even with the renormalization group evolution in the minimal
supersymmetric standard model, the scenario can be consistent with the data
provided a nontrivial role is played by the Majorana phases. Correlated
constraints are found on these phases and the neutrino mass scale using the
current data. We also indicate how future accurate measurements of the mixing
angles can serve as tests of this scenario and restrict the values of the
Majorana phases.


title: Multi-particle Production and Thermalization in High-Energy QCD

abstract:
  We argue that multi-particle production in high energy hadron and nuclear
collisions can be considered as proceeding through the production of gluons in
the background classical field. In this approach we derive the gluon spectrum
immediately after the collision and find that at high energies it is
parametrically enhanced by ln(1/x) with respect to the quasi-classical result
(x is the Bjorken variable). We show that the produced gluon spectrum becomes
thermal (in three dimensions) with an effective temperature determined by the
saturation momentum Qs, T= c Qs/2pi during the time ~1/T; we estimate
c=sqrt{2pi}/2 ~ 1.2. Although this result by itself does not imply that the
gluon spectrum will remain thermal at later times, it has an interesting
applications to heavy ion collisions. In particular, we discuss the possibility
of Bose-Einstein condensation of the produced gluon pairs and estimate the
viscosity of the produced gluon system.


title: Third order Coulomb correction to ttbar threshold cross section

abstract:
  We report on our result of third order Coulomb correction to the cross
section sigma(ee -> ttbar) near threshold. Analytic expression for the Coulomb
energy and wave function at the origin are obtained. We discuss the
significance of the Coulomb correction to the threshold cross section and heavy
quarkonium phenomenology.


title: Stable gapless superconductivity at strong coupling

abstract:
  We study cross-flavor Cooper pairing in a relativistic system of two fermion
species with mismatched Fermi surfaces. We find that there exist gapless phases
which are characterized by either one or two gapless nodes in the energy
spectra of their quasiparticles. An analysis of the current-current correlator
reveals that, at strong coupling, both of these gapless phases can be free of
magnetic instabilities and thus are stable. This is in contrast to the
weak-coupling case where there are always two gapless nodes and the phase
becomes magnetically unstable.


title: X(3872) in effective field theory

abstract:
  We consider the implications from the possibility that the recently observed
state X(3872) is a meson-antimeson molecule. We write an effective Lagrangian
consistent with the heavy-quark and chiral symmetries needed to describe
X(3872) and study its properties.


title:
Non-Photonic Electron $p_{T}$ Distributions and Correlations of
  Electrons from $B$ and $D$ Meson Decays with Charged Hadrons

abstract:
  We compare the non-photonic electron and $D^{0}$ meson $p_{T}$ distributions
measured at RHIC with the PYTHIA Monte Carlo event generator in p+p collisions
at $\sqrt{s_{NN}}=200$ GeV. A delta fragmentation function much harder than the
Peterson function, consistent with recombination scheme for charm meson
formation, is needed to match the experimental data. Attempts to fit the
non-photonic electrons at high $p_{T}$ show large uncertainties and the $B$
meson semi-leptonic decays may not be dominant for electron $p_{T}$ up to 8
GeV/c. Correlations of non-photonic electrons with charged hadrons are studied.
We propose an experimental method to quantitatively determine the relative
contributions of $D$ and $B$ meson semi-leptonic decays to the non-photonic
electrons.


title: Progress on NNLO subtraction

abstract:
  We review standard subtraction, as a method to compute cross sections at NNLO
accuracy.


title: Herwig++ 2.0beta Release Note

abstract:
  A new release of the Monte Carlo program Herwig++ (version 2.0beta) is now
available. The main new feature is the extension of the program to include
simple hadron-hadron processes including the initial-state parton shower.


title: Glue in the pomeron from nonlinear k_\perp-factorization

abstract:
  We derive the nonlinear k_\perp-factorization for the spectrum of jets in
high-mass diffractive deep inelastic scattering as a function of three hard
scales - the virtuality of the photon Q^2, the transverse momentum of the jet
and the saturation scale Q_A. In contrast to all other hard reactions studied
so far, we encounter a clash between the two definitions of the glue in the
pomeron -- from the inclusive spectrum of leading quarks and the small-\beta
evolution of the diffractive cross section. This clash casts a further shadow
on customary applications of the familiar collinear factorization to a pQCD
analysis of diffractive deep inelastic scattering.


title: Bose-Einstein Condensates as a Probe for Lorentz Violation

abstract:
  The effects of small Lorentz-violating terms on Bose-Einstein condensates are
analyzed. We find that there are changes to the phase and shape of the
ground-state wave function that vary with the orientation of the trap. In
addition, spin-couplings can act as a source for spontaneous symmetry breaking
in ferromagnetic condensates making them sensitive probes for fundamental
symmetry violation.


title: Production of a Q^2\bar{Q}^2 state in J/\psi\to \gamma\omega\phi

abstract:
  The resonance X(1810) discovered in $J/\psi\to \gamma\omega\phi$ by BESII is
considered as a candidate of $0^{++}$ $Q^2\bar{Q}^2$ state. This model predicts
that $X\to\omega\phi, K^* K^*$ are the two dominant decay channels and $X\to
KK, \eta\eta, \eta\eta'$ are suppressed. The cross sections of $\gamma\gamma\to
X\to \omega\phi, K^* K^*$ are estimated.


title: Consistency of the $\pi\Delta$ interaction in chiral perturbation theory

abstract:
  We analyze the constraint structure of a spin-3/2 particle interacting with a
pseudoscalar. Requiring the self consistency of the considered effective field
theory imposes restrictions on the possible interaction terms. In the present
case we derive two constraints among the three lowest-order $\pi\Delta$
interaction terms. From these constraints we find that the total Lagrangian is
invariant under the so-called point transformation. On the other hand,
demanding the invariance under the point transformation alone is less stringent
and produces only classes of relations among the coupling constants.


title: Masses of Fermions in Supersymmetric Models

abstract:
  We consider the mass generation for the usual quarks and leptons in some
supersymmetric models. The masses of the top, the bottom, the charm, the tau
and the muon are given at the tree level. All the other quarks and the electron
get their masses at the one loop level in the Minimal Supersymmetric Standard
Model (MSSM) and in two Supersymmetric Left-Right Models, one model uses
triplets (SUSYLRT) to break $SU(2)_{R}$-symmetry and the other use
doublets(SUSYLRD).


title: New Members in the $0^+$ ($0^{++})$ Family

abstract:
  Recent BES data on $J/\psi \to \phi \pi\pi$ indicate that there is a possible
new spin-0 state ($f_0(1790)$) with a mass of $m=1790^{+40}_{-30}
\mathrm{MeV}/\mathrm{c}^2$. Assuming it to be an iso-singlet $0^+(0^{++})$, we
propose a new mixing scheme to describe this and the other three known
iso-singlet $f_0(1370)$, $f_0(1500)$, $f_0(1710)$ states by adding iso-singlet
hybrid states to the usual basis of two iso-singlet quarkonia and one glueball.
Since there are two iso-singlet hybrid states, $(u\bar u+d\bar d)g/\sqrt 2$ and
$s\bar sg$, this new basis implies existence of another iso-singlet state $X$.
Using known data, we estimate the ranges of the mixing parameters. We find two
sets of solutions with X mass predicted to be about 1820 MeV and 1760 MeV,
respectively. We also study implications on the decay properties of these new
states.


title:
Probing CP Violating Two Higgs Doublet Model through Interplay between
  LHC and ILC

abstract:
  We study the neutral Higgs boson production at the CERN Large Hadron Collider
(LHC) and the future $e^- e^+$ linear collider (ILC) in the two Higgs doublet
model with CP violation. The CP-even and CP-odd scalars are mixed in this
model, which affects the production processes of neutral Higgs boson. We
examine the correlation of the Higgs production at LHC and ILC and provide a
strategy to distinguish the model from the CP conserving model and to determine
the parameters of the Higgs sector.


title: Spectra of Free Diquark in the Bethe-Salpeter Approach

abstract:
  In this work, we employ the Bethe-Salpeter (B-S) equation to investigate the
spectra of free diquarks and their B-S wave functions. We find that the B-S
approach can be consistently applied to study the diqaurks with two heavy
quarks or one heavy and one light quarks, but for two light-quark systems, the
results are not reliable. There are a few free parameters in the whole scenario
which can only be fixed phenomenologically. Thus, to determine them, one has to
study baryons which are composed of quarks and diquarks.


title:
An Algorithm to Construct Groebner Bases for Solving Integration by
  Parts Relations

abstract:
  This paper is a detailed description of an algorithm based on a generalized
Buchberger algorithm for constructing Groebner-type bases associated with
polynomials of shift operators. The algorithm is used for calculating Feynman
integrals and has proven itself efficient in several complicated cases.


title: Hyperon Polarization in a Quark-Quark Scattering Model

abstract:
  A continuing mystery in particle physics is the large polarization observed
in inclusive hyperon production in high energy p-p collisions. In this paper
the authors advance the concept that the polarization effects can be accounted
for in a simple model based on quarks becoming polarized in the direct q-q
scattering process and where, at a fundamental level, the s quark is treated no
differently than the u and d, except that it is required to have been created
as part of a s-sbar pair prior to the collision. The q-q polarization
parameters are extracted from p-p elastic scattering using a previous model and
these are used to predict the Lambda polarization from the p-p data. Remarkably
good agreement is obtained, raising the possibility that the large hyperon
polarizations are no more of a mystery than the p-p polarization itself and
that, at least at small pt, the two may be simply related. This concept is
extended in an attempt to explain the polarizations observed in other inclusive
hyperon processes with the finding that hyperon and elastic polarizations,
which previously seemed almost unrelated, may have a simple and common origin.


title:
$D_{s0}(2317)$ as a tetraquark state with QCD sum rules in heavy quark
  limit

abstract:
  In this article, we take the point of view that the charmed scalar meson
$D_{s0}(2317)$ be a tetraquark state and devote to calculate its mass within
the framework of the QCD sum rules approach in the heavy quark limit. The
numerical values for the mass of the $D_{s0}(2317)$ are consistent with the
experimental data, there must be some tetraquark component in the scalar meson
$D_{s0}(2317)$. Detailed discussions about the threshold parameter and Borel
parameter for the multiquark states are also presented.


title:
Gravitino Production from Heavy Moduli Decay and Cosmological Moduli
  Problem Revived

abstract:
  The cosmological moduli problem for relatively heavy moduli fields is
reinvestigated. For this purpose we examine the decay of a modulus field at a
quantitative level. The modulus dominantly decays into gauge bosons and
gauginos, provided that the couplings among them are not suppressed in the
gauge kinetic function. Remarkably the modulus decay into a gravitino pair is
unsuppressed generically, with a typical branching ratio of order 0.01. Such a
large gravitino yield after the modulus decay causes cosmological difficulties.
The constraint from the big-bang nucleosynthesis pushes up the gravitino mass
above 10^5 GeV. Furthermore to avoid the over-abundance of the stable
neutralino lightest superparticles (LSPs), the gravitino must weigh more than
about 10^6 GeV for the wino-like LSP, and even more for other neutralino LSPs.
This poses a stringent constraint on model building of low-energy
supersymmetry.


title: Gluon self-energy in the color-flavor-locked phase

abstract:
  We calculate the self-energies and the spectral densities of longitudinal and
transverse gluons at zero temperature in color-superconducting quark matter in
the color-flavor-locked (CFL) phase. We find a collective excitation, a
plasmon, at energies smaller than two times the gap parameter and momenta
smaller than about eight times the gap. The dispersion relation of this mode
exhibits a minimum at some nonzero value of momentum, indicating a van Hove
singularity.


title: Sterile neutrino decay and the LSND experiment

abstract:
  We propose a new explanation of the intriguing LSND evidence for electron
antineutrino appearance in terms of heavy (mostly sterile) neutrino decay via a
coupling with a light scalar and light (mostly active) neutrinos. We perform a
fit to the LSND data, as well as all relevant null-result experiments, taking
into account the distortion of the spectrum due to decay. By requiring a
coupling g ~ 10^{-5}, a heavy neutrino mass m_4 ~ 100 keV and a mixing with
muon neutrinos |U_{mu 4}|^2 ~ 10^{-2}, we show that this model explains all
existing data evading constraints that disfavor standard (3+1) neutrino models.


title: Neutrino Mass Matrices With Vanishing Determinant

abstract:
  We investigate the prospects for neutrinoless double beta decay, texture
zeros and equalities between neutrino mass matrix elements in scenarios with
vanishing determinant mass matrices for vanishing and finite $\theta_{13}$
mixing angle in normal and inverse mass hierarchies. For normal hierarchy and
both zero and finite $\theta_{13}$ it is found that neutrinoless double beta
decay cannot be observed by any of the present or next generation experiments,
while for inverse hierarchy it is, on the contrary, accessible to experiments.
Regarding texture zeros and equalities between mass matrix elements, we find
that in both normal and inverse hierarchies with $\theta_{13}=0$ no texture
zeros nor any such equalities can exist apart from the obvious ones. For
$\theta_{13}\ne 0$ some texture zeros become possible. In normal hierarchy two
texture zeros occur if $8.1\times 10^{-2}\leq |sin \theta_{13}|\leq 9.1\times
10^{-2}$ while in inverse hierarchy three are possible, one with $|sin
\theta_{13}|\geq 7\times 10^{-3}$ and two others with $|sin \theta_{13}|\geq
0.18$. All equalities between mass matrix elements are impossible with
$\theta_{13}\ne 0$.


title:
Improving reliability of perturbative QCD predictions at moderate
  energies

abstract:
  The problem of precise evaluation of the perturbative QCD predictions at
moderate energies is considered. Substantial renormalization scheme dependence
of the perturbative predictions obtained with the conventional renormalization
group improved perturbative approximants is discussed, using as an example the
QCD effective charge appearing in the static interquark potential and the QCD
corrections to the Gross-Llewellyn-Smith sum rule in the deep inelastic
neutrino-nucleon scattering. A new method for evaluating the QCD predictions at
moderate energies is proposed, based on a modified couplant, which is
constructed to be free from Landau singularity and less renormalization scheme
dependent than the conventional couplant. The modified couplant contains an
adjustable parameter, which may be used to improve the modified perturbative
predictions in low orders by utilizing some information outside of perturbation
theory. This parameter is fixed by matching the modified predictions to the
phenomenological expression for the effective charge in the interquark
potential. The renormalization scheme dependence of the perturbative
predictions in the modified expansion is then discussed in detail, including
the predictions selected by the Principle of Minimal Sensitivity applied to the
modified expansion. It is shown that the predictions obtained in the modified
expansion are much more stable with respect to change of the renormalization
scheme parameters than the predictions obtained in the conventional approach.
It is also found that the modified predictions display somewhat weaker energy
dependence then the predictions obtained with the conventional expansion, which
may help accommodate in a consistent way some low values of the strong coupling
parameter measured at low energies with the values measured at high energies.


title: Finite-size effects on the QCD phase diagram

abstract:
  We discuss the finite-size effects on the chiral phase transition in QCD. We
employ the Nambu-Jona-Lasinio model and calculate the thermodynamic potential
in the mean-field approximation. Finite-size effects on the thermodynamic
potential are taken into account by employing the multiple reflection
expansion. The critical temperature is lowered and the order of the phase
transition is changed form first to second as the size of the system of
interest is reduced.


title: Higgs boson decay into Z bosons and a photon

abstract:
  We have performed a one-loop calculation of the width of the rare decay H ->
Z Z \gamma in the standard model for Higgs boson masses 190 GeV \leq m_H \leq
250 GeV. We find that the most dominant helicity combinations for the Z bosons
and the photon is when one of the Z bosons is longitudinally polarized and the
other Z boson and the photon have the same helicity. A comparison of the decay
width \Gamma(H->Z Z \gamma) to those of H->\gamma \gamma and H->\gamma Z shows
that the ratios of the decay widths are \Gamma(H->Z Z \gamma) /
\Gamma(H->\gamma\gamma) ~ \Gamma(H->Z Z \gamma) / \Gamma(H->\gamma Z) ~
10^{-7}.


title:
Superfield Calculation of Loop Contribution in Extra Dimensional
  Theories

abstract:
  Superfields provide a compact description of supersymmetry representations.
Loop corrections with superfield formalism are simpler and much more manageable
than calculation in terms of component fields. In this paper we calculate the
contribution of the Kaluza-Klein states, associated with extra dimensions, to
the renormalization group beta function. These Kaluza-Klein particles circulate
in the virtual loop, hence affecting the overall corrections at any order. We
obtain the one-loop correction, which checks with the result previously
obtained using the more laborious component field method. In addition, we
calculate the two-loop correction coming from chiral KK states.


title:
Full one-loop electroweak and NLO QCD corrections to the associated
  production of chargino and neutralino at hadron colliders

abstract:
  We study the process of the association production of chargino and neutralino
including the NLO QCD and the complete one-loop electroweak corrections in the
framework of the minimal supersymmetric standard model(MSSM) at the Fermilab
Tevatron and the CERN Large Hadron Collider (LHC). In both the NLO QCD and
one-loop electroweak calculations we apply the algorithm of the phase-space
slicing(PSS) method. We find that the NLO QCD corrections generally increase
the Born cross sections, while the electroweak relative corrections decrease
the Born cross section in most of the chosen parameter space. The NLO QCD and
electroweak relative corrections typically have the values of about 32% and -8%
at the Tevatron, and about 42% and -6% at the LHC respectively. The results
show that both the NLO QCD and the complete one-loop electroweak corrections to
the processes $p \bar p/pp \to \widetilde{\chi}_1^{\pm} \widetilde{\chi}_2^0+X$
are generally significant and should be taken into consideration in precision
experimental analysis.


title: Phenomenology of lepton-nucleus DIS

abstract:
  The results of recent phenomenological studies of unpolarized nuclear
deep-inelastic scattering are discussed and applied to calculate neutrino
charged-current structure functions and cross sections for a number of nuclei.


title: J/psi, psi' and Upsilon Production at Hadron Colliders: a review

abstract:
  We give an overview of the present status of knowledge of the production of
J/psi, psi' and Upsilon in high-energy hadron collisions. We first present two
early models, namely the Colour-Singlet Model (CSM) and the Colour-Evaporation
Model (CEM). The first is the natural application of pQCD to quarkonium
production and has been shown to fail dramatically to describe data, the second
is its phenomenological counterpart and was introduced in the spirit of the
quark-hadron duality in the late seventies. Then, we expose the most recent
experimental measurements of J/psi, psi' and Upsilon prompt and direct
production at nonzero p_T from two high-energy hadron colliders, the Tevatron
and RHIC. In a third part, we review six contemporary models describing J/psi,
psi' and Upsilon production at nonzero p_T.


title: Spontaneous Nambu-Goldstone Currents Generation Driven by Mismatch

abstract:
  We review recent progress of understanding and resolving instabilities driven
by mismatch between the Fermi surfaces of the pairing quarks in 2-flavor color
superconductor. With the increase of mismatch, the 2SC phase exhibits
chromomagnetic instability as well as color neutral baryon current instability.
We describe the 2SC phase in the nonlinear realization framework, and show that
each instability indicates the spontaneous generation of the corresponding
pseudo Nambu-Golstone current. The Nambu-Goldstone currents generation state
covers the gluon phase as well as the one-plane wave LOFF state. We further
point out that, when charge neutrality condition is required, there exists a
narrow unstable LOFF (Us-LOFF) window, where not only off-diagonal gluons but
the diagonal 8-th gluon cannot avoid the magnetic instability. In this Us-LOFF
window, the diagonal magnetic instability cannot be cured by off-diagonal gluon
condensate in the color superconducting phase.


title:
A quantum mechanical description of the experiment on the observation of
  gravitationally bound states

abstract:
  Quantum states in the Earth's gravitational field were observed, when
ultra-cold neutrons fall under gravity. The experimental results can be
described by the quantum mechanical scattering model as it is presented here.
We also discuss other geometries of the experimental setup which correspond to
the absence or the reversion of gravity. Since our quantum mechanical model
describes, particularly, the experimentally realized situation of reversed
gravity quantitatively, we can practically rule out alternative explanations of
the quantum states in terms of pure confinement effects.


title: Event-by-Event Fluctuations of Particle Ratios in Heavy-Ion Collisions

abstract:
  We study event-by-event dynamical fluctuations of various particle ratios at
different energies. We assume that particle production in final state is due to
chemical equilibrium processes. We compare results from resonance gas model
with available experimental data. At SPS energies, the model can very well
reproduce the experimentally measured fluctuations. We make predictions for
dynamical fluctuations of strangeness and non-strangeness particle ratios. We
found that the energy-dependence is non-monotonic. Furthermore, we found that
fluctuations strongly depend on particle ratios.


title: Spin-glass model of QCD near saturation

abstract:
  We establish a connection between the cascading of gluon momenta modeled with
the diffusive approximation of the Balitsky-Fadin-Kuraev-Lipatov kernel and the
thermodynamics of directed polymers on a tree with disorder. Using known
results on the low-temperature spin-glass phase of this statistical-mechanic
problem we describe the dynamical phase space of gluon transverse momenta near
saturation including its fluctuation pattern. It exhibits a nontrivial
clustering structure, analoguous to ``hot spots'', whose distributions are
derived and possess universal features in common with other spin-glass systems.


title: Supersymmetry, Naturalness, and Signatures at the LHC

abstract:
  Weak scale supersymmetry is often said to be fine-tuned, especially if the
matter content is minimal. This is not true if there is a large A term for the
top squarks. We present a systematic study on fine-tuning in minimal
supersymmetric theories and identify low energy spectra that do not lead to
severe fine-tuning. Characteristic features of these spectra are: a large A
term for the top squarks, small top squark masses, moderately large tan\beta,
and a small \mu parameter. There are classes of theories leading to these
features, which are discussed. In one class, which allows a complete
elimination of fine-tuning, the Higgsinos are the lightest among all the
superpartners of the standard model particles, leading to three nearly
degenerate neutralino/chargino states. This gives interesting signals at the
LHC -- the dilepton invariant mass distribution has a very small endpoint and
shows a particular shape determined by the Higgsino nature of the two lightest
neutralinos. We demonstrate that these signals are indeed useful in realistic
analyses by performing Monte Carlo simulations, including detector simulations
and background estimations. We also present a method that allows the
determination of all the relevant superparticle masses without using input from
particular models, despite the limited kinematical information due to short
cascades. This allows us to test various possible models, which is demonstrated
in the case of a model with mixed moduli-anomaly mediation. We also give a
simple derivation of special renormalization group properties associated with
moduli mediated supersymmetry breaking, which are relevant in a model without
fine-tuning.


title: Lorentz and CPT tests involving antiprotons

abstract:
  Lorentz and CPT tests involving matter-antimatter comparisons at low
temperatures are discussed. SME predictions for transition frequencies in such
systems include both matter-antimatter differences and sidereal variations. In
hydrogen-antihydrogen spectroscopy, leading-order effects in a 1S-2S transition
as well as in a 1S Zeeman transition could exist that can be employed to obtain
clean constraints. Similarly, tight bounds can be determined from Penning-trap
experiments involving antiprotons.


title: The Comments on QED Contributions to $(g-2)_{\mu}$

abstract:
  The comparison of definite numerical values of analytically evaluated
asymptotic expressions for order $\alpha^4$ and $\alpha^5$ QED contributions to
the muon anomalous magnetic moment with the results of numerical calculations
are presented. It is stressed that observed agreement can be considered as the
additional argument in favour of correctness of the recent direct numerical
calculations.


title: Time Variations of the Superkamiokande Solar Neutrino Flux Data

abstract:
  We have used the Date-Compensated Discrete Fourier Transform and Periodogram
analysis of the solar neutrino flux data from 1) 5-day-long samples from
Super-Kamiokande-I detector during the period from June, 1996 to July, 2001; 2)
10-day-long samples from the same detector during the same period and 3)
45-day-long samples from the same detector during the same period. (1) exhibits
periodicity around 0.21-0.22, 0.67-0.77, 1.15-1.98, 6.72-6.95, 12.05-13.24,
22.48-24.02, 33.50 and 40.73 months. (2) shows periodicity around 0.39-0.45,
1.31-2.23, 5.20-5.32, 9.43-11.65, 13.54-14.38, 24.54, 32.99 and 41.69 months.
For (3) we observe periodicity around 1.61, 14.01, 24.06, 32.50 and 42.03
months. We have found almost similar periods in the solar flares, sunspot data,
solar proton data (\bar{\epsilon}>10 Mev) which indicates that the solar
activity cycle may be due to the variable character of nuclear energy
generation inside the sun.


title:
Phase Transition of Finite Size Quark Droplets with Isospin Chemical
  Potential in the Nanbu--Jona-Lasinio Model

abstract:
  Making use of the NJL model and the multiple reflection expansion
pproximation, we study the phase transition of the finite size droplet with u
and d quarks. We find that the dynamical masses of u, d quarks are different,
and the chiral symmetry can be restored at different critical radii for u, d
quark. It rovides a clue to understand the effective nucleon mass splitting in
nuclear matter. Meanwhile, it shows that the maximal isospin chemical potential
at zero temperature is much smaller than the mass of pion in free space.


title: Bard: Interpreting New Frontier Energy Collider Physics

abstract:
  No systematic procedure currently exists for inferring the underlying physics
from discrepancies observed in high energy collider data. We present Bard, an
algorithm designed to facilitate the process of model construction at the
energy frontier. Top-down scans of model parameter space are discarded in favor
of bottom-up diagrammatic explanations of particular discrepancies, an
explanation space that can be exhaustively searched and conveniently tested
with existing analysis tools.


title:
Differential equations and massive two-loop Bhabha scattering: the
  B5l2m3 case

abstract:
  The two-loop box contributions to massive Bhabha scattering may be reduced to
two-loop box master integrals (MIs) with five, six, and seven internal lines,
plus vertices and self energies. The self-energy and vertex MIs may be solved
analytically by the differential equations (DE) method. This is true for only
few of the box masters. Here we describe some details of the analytical
determination, including constant terms in ep=(4-d)/2, of the complicated
topology B5l2m3 (with 5 lines, 2 of them being massive). With the DE approach,
three of the four coupled masters have been solved in terms of (generalized)
standard Harmonic Polylogarithms.


title:
Monte Carlo simulation of single spin asymmetries in pion-proton
  collisions

abstract:
  We present Monte Carlo simulations of both the Sivers and the Boer-Mulders
effects in the polarized Drell-Yan $\pi^\pm p^\uparrow \to \mu^+ \mu^- X$
process at the center-of-mass energy $\sqrt{s} \sim 14$ GeV reachable at
COMPASS with pion beams of energy 100 GeV. For the Sivers effect, we adopt two
different parametrizations for the Sivers function to explore the statistical
accuracy required to extract unambiguous information on this parton density. In
particular, we verify the possibility of checking its predicted sign change
between Semi-Inclusive Deep-Inelastic Scattering (SIDIS) and Drell-Yan
processes, a crucial test of nonperturbative QCD. For the Boer-Mulders effect,
because of the lack of parametrizations we can make only guesses. The goal is
to explore the possibility of extracting information on the transversity
distribution, the missing piece necessary to complete the knowledge of the
nucleon spin structure at leading twist, and the Boer-Mulders function, which
is related to the long-standing problem of the violation of the Lam-Tung sum
rule in the unpolarized Drell-Yan cross section.


title: Soliton with a Pion Field in the Global Color Symmetry Model

abstract:
  We calculate the property of the global color symmetry model soliton with the
pion field being included explicitly. The calculated results indicate that the
pion field provides a strong attraction so that the eigen-energy of a quark and
the mass of a soliton reduce drastically, in contrast to those with only the
sigma field.


title: Quadrupolar contact terms and Hyperfine Structure

abstract:
  In the interaction of two electric quadrupoles, there is at short distances a
contact term proportional to the second derivative of a delta function. This
contact term contributes to the hyperfine splitting of bound states of two
particles with spin one or higher-for example the bound states of Omega minus
and a nucleus of spin one.The contact hyperfine splitting occurs in states with
orbital angular momentum one(p-wave), in contrast to the Fermi contact
interaction which is in s-states.We find that these contact splittings will be
observable with Omega minus atoms and help measure the quadrupole moment and
charge radius of the hyperon.


title: Modular thermal inflation without slow-roll approximation

abstract:
  We study an inflationary scenario where thermal inflation is followed by
fast-roll inflation. This is a rather generic possibility based on the
effective potentials of spontaneous symmetry breaking in the context of
particle physics models. We show that a large enough expansion could be
achieved to solve cosmological problems. However, the power spectrum of
primordial density perturbations from the quantum fluctuations in the inflaton
field is not scale invariant and thus inconsistent with observations. Using the
curvaton mechanism instead, we can obtain a nearly scale invariant spectrum,
provided that the inflationary energy scale is sufficiently low to have long
enough fast-roll inflation to dilute the perturbations produced by the inflaton
fluctuations.


title:
Automated Calculation Scheme for alpha^n Contributions of QED to Lepton
  g-2

abstract:
  This article reports an automated approach to the evaluation of higher-order
terms of QED perturbation to anomalous magnetic moments of charged leptons by
numerical means. We apply this approach to tenth-order correction due to a
particular subcollection of Feynman diagrams, which have no virtual lepton
loops. This set of diagrams is distinctive in that it grows factorially in
number as the order increases, and also each of the diagrams holds quite a
large number of subtraction terms to be treated along renormalization
procedure. Thus some automated scheme has long been required to evaluate
correctly this class of diagrams. We developed a fast algorithm and an
implementation which automates necessary steps to generate from the
representation of each Feynman diagram the FORTRAN codes for numerical
integration. Currently those diagrams of tenth order are being evaluated.


title: Final state interactions in the electroweak nuclear response

abstract:
  I review the description of the electroweak nuclear response at large
momentum transfer within nonrelativistic many-body theory. Special
consideration is given to the effects of final state interactions, which are
known to be large in both inclusive and semi-inclusive processes. The results
of theoretical calculations of electron-nucleus scattering observables are
compared to the data, and the generalization to charged current
neutrino-nucleus interactions is discussed.


title:
Heavy Higgs Resonances for the Neutralino Relic Density in the Higgs
  Decoupling Limit of the CP--noninvariant Minimal Supersymmetric Standard
  Model

abstract:
  The lightest neutralino is a compelling candidate to account for cold dark
matter in the universe in supersymmetric theories with $R$--parity. In the
CP-invariant theory, the neutralino relic density can be found in accord with
recent WMAP data if neutralino annihilation in the early universe occurs via
the s-channel $A$ funnel. In contrast, in the CP-noninvariant theory two heavy
neutral Higgs bosons can contribute to the Higgs funnel mechanism significantly
due to a CP-violating {\it complex} mixing between two heavy states, in
particular, when they are almost degenerate. With a simple analytic and
numerical analysis, we demonstrate that the CP-violating Higgs mixing can
modify the profile of the neutralino relic density {\it considerably} in the
heavy Higgs funnel with the neutralino mass close to half of the heavy Higgs
masses.


title: Relativistic treatment of the decay constants of light and heavy mesons

abstract:
  Novel relativistic expressions are used to calculate the weak decay constants
of pseudoscalar and vector mesons within the constituent quark model. Meson
wave functions satisfy the quasipotential equation with the complete
relativistic potential. New contributions, coming from the negative-energy
quark states, are substantial for the light mesons, significantly decrease the
values of their decay constants and, thus, bring them into agreement with
experiment. For heavy-light mesons these contribution are much less pronounced,
but permit to reduce uncertainties of the predicted decay constants. Their
values agree with the results of lattice calculations and experimental data.


title: The Suppression of Neutralino Annihilation into Zh

abstract:
  The Indirect Detection of neutralino Dark Matter is most promising through
annihilation channels producing a hard energy spectrum for the detected
particles, such as the neutralino annihilation into $Zh$. A cancellation
however makes this particular annihilation channel generically subdominant in
the huge parameter space of supersymmetric models. This cancellation requires
non-trivial relations between neutralino mixings and masses, which we derive
from gauge independence and unitarity of the MSSM. To show how the cancellation
overshoots leaving only a subdominant result, we use a perturbative expansion
in powers of the electroweak/supersymmetry breaking ratio $m_{Z}/m_{\chi}$.


title: K* photoproduction off the nucleon: gamma N --> K* Lambda

abstract:
  We study the photoproduction of $K^*(892)$ vector meson from both the charged
and neutral reactions, $\gamma p \to K^{*+} \Lambda$ and $\gamma n \to K^{*0}
\Lambda$. The production mechanisms that we consider include $t$-channel $K^*$,
$K$, $\kappa$ exchanges, s-channel nucleon diagram, and $u$-channel $\Lambda$,
$\Sigma$, $\Sigma^*$ diagrams. These could constitute important backgrounds for
future investigation of ``missing'' resonances that can be searched for
especially in these reactions. The $t$-channel $K$ meson exchange is found to
dominate both reactions. The total and differential cross sections are
presented together with some spin asymmetries.


title: Towards a New State of Matter

abstract: Progress on Quark Gluon Plasma


title: Analytical approximations to the spectra of quark-antiquark potentials

abstract:
  A method, recently devised to obtain analytical approximations to certain
classes of integrals, is used in combination with the WKB expansion to derive
accurate analytical expressions for the spectrum of quantum potentials. The
accuracy of our results is verified by comparing them both with the literature
on the subject and with the numerical results obtained with a Fortran code. As
an application of the method that we propose, we consider the meson
spectroscopy with various phenomenological potentials.


title: A Simple Parameterization of Matter Effects on Neutrino Oscillations

abstract:
  We present simple analytical approximations to matter-effect corrected
effective neutrino mixing-angles and effective mass-squared-differences. The
expressions clarify the dependence of oscillation probabilities in matter to
the mixing angles and mass-squared-differences in vacuum, and are useful for
analyzing long-baseline neutrino oscillation experiments.


title: Connecting Dark Energy to Neutrinos with an Observable Higgs Triplet

abstract:
  To connect the scalar field (acceleron) responsible for dark energy to
neutrinos, the usual strategy is to add unnaturally light neutral singlet
fermions (right-handed neutrinos) to the Standard Model. A better choice is
actually a Higgs triplet, through the coupling of the acceleron to the
trilinear Higgs triplet-double-doublet interaction. This hypothesis predicts an
easily observable doubly-charged Higgs boson at the forthcoming Large Hadron
Collider (LHC).


title: Overview and Charge -- Snowmass Workshop 2005

abstract:
  This contribution to the published Proceedings records the opening talk I
presented on the first morning of the 2005 International Linear Collider
Workshop in Snowmass, CO, August 14 - 27, 2005. It includes a summary of the
motivation for the workshop, the scientific goals and charges for the working
groups, the initial plans of the accelerator, detector, and physics groups, and
the activities of the communication, education, and outreach group. This
document also describes organizational aspects of the meeting, particularly the
scientific committee structure, the self-organization of the working groups,
the composition of the indispensable secretariat and computer support teams,
and the sources of funding support. The report serves as an introduction to the
proceedings whose individual papers and summary documents must be consulted for
an appreciation of the accomplishments and progress made at Snowmass in 2005
toward the realization of an International Linear Collider.


title: Fluctuations in jet momentum as an energy loss probe

abstract:
  We investigate the measurement of the distribution of away-side jet $p_T$ as
a way to probe the energy loss mechanism in heavy ion collisions, and constrain
the properties of the medium created in heavy ion collisions. We define an
observable related to the fluctuation of the energy deposited in the medium,
and show that competing models of parton energy loss give differing values and
scaling of this observable. We also argue that the scaling of this observable
with system size can be related to the medium's partonic density. We then give
a qualitative discussion of how the measurement we suggest can be performed and
used to determine the parton energy loss mechanism and possibly the system's
partonic density.


title:
Next-to-leading order corrections to Bhabha scattering in
  renormalization group approach (I). Soft and virtual photonic contributions

abstract:
  Soft and virtual loop photonic contributions to the second order
next-to-leading QED radiative corrections to Bhabha scattering are calculated
with help of the renormalization group approach. The results are in agreement
with earlier calculations, where other methods were used. Scale dependence and
the present theoretical accuracy of Bhabha cross section description are
discussed.


title:
Modified Hagedorn formula including temperature fluctuation - Estimation
  of temperatures at RHIC experiments -

abstract:
  We have systematically estimated the possible temperatures obtained from an
analysis of recent data on $p_t$ distributions observed at RHIC experiments.
Using the fact that observed $p_t$ distributions cannot be described by the
original Hagedorn formula in the whole range of transverse momenta (in
particular above 6 GeV/c), we propose a modified Hagedorn formula including
temperature fluctuation. We show that by using it we can fit $p_t$
distributions in the whole range and can estimate consistently the relevant
temperatures, including their fluctuations.


title: Nucleon Form Factors in Dispersion Theory

abstract:
  Dispersion relations provide a powerful tool to analyse the electromagnetic
form factors of the nucleon both in the space-like and time-like regions with
constraints from other experiments, unitarity, and perturbative QCD. We give a
brief introduction into dispersion theory for nucleon form factors and present
first results from our ongoing form factor analysis. We also calculate the
two-pion continuum contribution to the isovector spectral functions drawing
upon the new high statistics measurements of the pion form factor by the CMD-2,
KLOE, and SND collaborations.


title: Production of $\Omega_{scb}$ Baryons in Electron-Positron Collisions

abstract:
  The total and differential cross sections for the production of
$\Omega_{scb}$ baryons in electron-positron collisions are calculated at the
$Z$-boson pole.


title:
Nonlinear collective effects in photon-photon and photon-plasma
  interactions

abstract:
  We consider strong-field effects in laboratory and astrophysical plasmas and
high intensity laser and cavity systems. Current state-of-the-art laser
facilities are close to reaching energy scales at which quantum electrodynamics
will play a crucial role in the dynamics of plasmas and indeed the vacuum
itself. Developments such as the free electron laser may also give a means for
exploring remote violent events such as supernovae in a laboratory environment.
Here we describe the implications of collective interactions between photons
and photon-plasma systems. We give an overview of strong field vacuum effects
and a set of equations describing the nonlinear propagation of an
electromagnetic pulse on a radiation-plasma is derived. Effects introduced by
QED in pair plasmas is described. Applications to laser-plasma systems and
astrophysical environments are discussed.


title: Impact of Right-handed Strange-beauty Squark on b <-> s Transitions

abstract:
  As the hint for CP violating new physics in B-> phi Ks has weakened, we
reconsider the possibility of near maximal mixing between \tilde s_R-\tilde b_R
squarks. Such a right-handed strange-beauty squark \widetilde{sb}_{1} can be
realized by combining supersymmetry with an approximate Abelian flavor
symmetry, and comes with a unique new CP violating phase from right-handed
quark mixing. Naturally heavy strange-beauty squark and gluino, of order 0.5 to
1 TeV, are easily accommodated by recent time-dependent CP violation
measurements in Bd -> phi K^0 and pi^0 K^0. Because of near maximal mixing,
even with such heavy masses, the \widetilde{sb}_{1} and \tilde g can still
strongly impact on Bs mass difference and generate CP violation in the mixing,
which can still be probed at Tevatron Run II. But if the scenario is realized,
the LHC will provide definitive information on the new CP phase, and possibly
discover the \widetilde{sb}_{1} squark. Time-dependent CP violation in Bd ->
K^{*0} gamma can be probed at the future B factory upgrades. Other b -> s
decays influenced by large right-handed dynamics are also discussed.


title: Baryon Spectrum in Large N(C) Chiral Soliton and in Quark Models

abstract:
  Strangeness contents of baryons are calculated within rigid rotator model for
arbitrary number of colors $N_c$. The problem of extrapolation to realistic
value $N_c=3$ is noted, based on explicit calculations and comparison of rigid
rotator and rigid oscillator variants of the model. Some features of exotic
baryon spectra ($\{\bar{10}\}, \{27\}$-and $\{35\}$-plets of baryons) obtained
in the chiral soliton approach can be understood in terms of simplified quark
$(4q\bar{q})$ wave functions. The effective mass of strange antiquark in
different SU(3) multiplets of pentaquarks should depend on the particular
multiplet, to link the predictions of soliton and quark models. The estimate of
the $6_F$ and $\bar{3}_F$ diquarks mass difference can be made from comparison
with chiral soliton model results for masses of exotic baryons from different
SU(3)-multiplets. The masses of baryons partners with different values of spin
$J$ are also estimated.


title: Multiloop Calculations: towards R at Order alpha_s^4

abstract:
  We discuss recent developments in multiloop calculations aiming eventually in
computing the total cross section for e^+e^- annihilation into hadrons in order
alpha_s^4.


title:
Comment about constraints on nanometer-range modifications to gravity
  from low-energy neutron experiments

abstract:
  A topic of present interest is the application of experimentally observed
quantum mechanical levels of ultra-cold neutrons in the earth's gravitational
field for searching short-range modifications to gravity. A constraint on new
forces in the nanometer-range published by Nesvizhevsky and Protasov follows
from inadequate modelling of the interaction potential of a neutron with a
mirror wall. Limits by many orders of magnitude better were already derived
long ago from the consistency of experiments on the neutron-electron
interaction.


title: Hadron Systematics and Emergent Diquarks

abstract:
  We briefly review a variety of theoretical and phenomenological indications
for the probable importance of powerful diquark correlations in hadronic
physics. We demonstrate that the bulk of light hadron spectroscopy can be
organized using three simple hypotheses: Regge-Chew-Frautschi mass formulae,
feebleness of spin-orbit forces, and energetic distinctions among a few
different diquark configurations. Those hypotheses can be implemented in a
semi-classical model of color flux tubes, extrapolated down from large orbital
angular momentum $L$. We discuss refinements of the model to include the
effects of tunneling, mass loading, and internal excitations. We also discern
effects of diquark correlations in observed patterns of baryon decays. Many
predictions and suggestions for further work appear.


title: Higgs Boson Production from Black Holes at the LHC

abstract:
  If the fundamental Planck scale is near a TeV, then TeV scale black holes
should be produced in proton-proton collisions at the LHC where \sqrt{s} = 14
TeV. As the temperature of the black holes can be ~ 1 TeV we also expect
production of Higgs bosons from them via Hawking radiation. This is a different
production mode for the Higgs boson, which would normally be produced via
direct pQCD parton fusion processes. In this paper we compare total cross
sections and transverse momentum distributions d\sigma/dp_T for Higgs
production from black holes at the LHC with those from direct parton fusion
processes at next-to-next-to-leading order and next-to-leading order
respectively. We find that the Higgs production from black holes can be larger
or smaller than the direct pQCD production depending upon the Planck mass and
black hole mass. We also find that d\sigma/dp_T of Higgs production from black
holes increases as a function of p_T which is in sharp contrast with the pQCD
predictions where d\sigma/dp_T decreases so we suggest that the measurement of
an increase in d\sigma/dp_T as p_T increases for Higgs (or any other heavy
particle) production can be a useful signature for black holes at the LHC.


title: New-Physics Search through gamma gamma -> t tbar -> lX/bX

abstract:
  We probe optimal beam polarizations for new-physics search in top-quark and
Higgs-boson sectors at Photon Linear Colliders (PLC). Expressing possible
non-standard effects generated by SU(2)xU(1) gauge-invariant dimension-6
effective operators as anomalous top and Higgs couplings, we estimate expected
statistical sensitivities of these couplings in gamma gamma -> t tbar -> lX/bX,
using the optimal-observable method.


title:
Neutralino Production and Decay at an e^+e^- Linear Collider with
  Transversely Polarized Beams

abstract:
  Once supersymmetric neutralinos $\tilde{\chi}^0$ are produced copiously at
$e^+e^-$ linear colliders, their characteristics can be measured with high
precision. In particular, the fundamental parameters in the gaugino/higgsino
sector of the minimal supersymmetric extension of the standard model (MSSM) can
be analyzed. Here we focus on the determination of possible CP--odd phases of
these parameters. To that end, we exploit the electron/positron beam
polarization, including transverse polarization, as well as the spin/angular
correlations of the neutralino production $e^+ e^- \to \tilde{\chi}^0_i
\tilde{\chi}^0_j$ and subsequent 2--body decays $\tilde{\chi}^0_i \to
\tilde{\chi}^0_k h, \tilde{\chi}^0_k Z, \tilde \ell^\pm_R \ell^\mp$, using
(partly) optimized CP--odd observables. If no final--state polarizations are
measured, the $Z$ and $h$ modes are independent of the $\tilde{\chi}^0_i$
polarization, but CP--odd observables constructed from the leptonic decay mode
can help in reconstructing the neutralino sector of the CP--noninvariant MSSM.
In this situation, transverse beam polarization does not seem to be
particularly useful in probing explicit CP violation in the neutralino sector
of the MSSM. This can most easily be accomplished using longitudinal beam
polarization.


title: Fermion Mass Hierarchy in the Nu MSGUT I : The Real Core

abstract:
  The recent failure of the scenario which uses only $\mathbf{10,\oot}$ Higgs
multiplets to yield large enough neutrino masses in the $\mathbf{SO(10) }$
  \textbf{MSGUT} motivates an alternative scenario\cite{blmdoom} where the
$\mathbf{120}$ -plet collaborates with the $ \mathbf{10}$ -plet to fit the
dominant charged fermion masses. The small $\mathbf{\oot} $ -plet couplings
give appreciable contributions only to light charged fermion masses
{\textit{and}} enhance the Type I seesaw masses to viable values. We analyze
the 2-3 generation core of the complete hierarchical fermion mass system in the
CP conserving approximation. \emph{Ansatz} consistency \emph{requires}
${\mathbf{m_b-m_s = m_{\tau}-m_{\mu}}} $ at the GUT scale $M_X$ and predicts
near maximal (PMNS) mixing in the leptonic sector for central values of charged
fermion parameters and for wide ranges of the other relevant parameters :
righthanded neutrino masses and relative strength of contributions of the two
doublet pairs from the $\mathbf{120}$-plet to the effective MSSM Higgs pair.
These features are preserved in the CP preserving 3 generation system whose
results are previewed : an additional consistency requirement
$\mathbf{\theta_{13}^c =\theta_{12}^c \theta_{23}^c }$ on the CKM angles at
$M_X$ arises for 3 generations. Right handed neutrino masses in such scenarios
are all less than about $10^{12} GeV$.


title: A new critical study of photon production in hadronic collisions

abstract:
  In the light of the new prompt photon data collected by PHENIX at RHIC and by
D0 at the run II of the Tevatron, we revisit the world prompt photon data, both
inclusive and isolated, in hadronic collisions, and compare them with the NLO
QCD calculations implemented in the Monte Carlo programme JETPHOX.


title:
On the Koide-like Relations for the Running Masses of Charged Leptons,
  Neutrinos and Quarks

abstract:
  Current experimental data indicate that the Koide relation for the pole
masses of charged leptons, which can be parametrized as $Q^{pole}_l = 2/3$, is
valid up to the accuracy of $O(10^{-5})$. We show that the running masses of
charged leptons fail in satisfying the Koide relation (i.e., $Q_l(\mu) \neq
2/3$), but the discrepancy between $Q_l (\mu)$ and $Q^{pole}_l$ is only about
0.2% at $\mu=M_Z$. The Koide-like relations for the running masses of neutrinos
($1/3 < Q_\nu(M_Z) < 0.6$), up-type quarks ($Q_{U}(M_Z) \sim 0.89$) and
down-type quarks ($Q_{D}(M_Z) \sim 0.74$) are also examined from $M_Z$ up to
the typical seesaw scale $M_R \sim 10^{14}$ GeV, and they are found to be
nearly stable against radiative corrections. The approximate stability of
$Q_{U}(\mu)$ and $Q_{D}(\mu)$ is mainly attributed to the strong mass hierarchy
of quarks, while that of $Q_l(\mu)$ and $Q_\nu(\mu)$ is essentially for the
reason that the lepton mass ratios are rather insensitive to radiative
corrections.


title: The medium in heavy-ion collisions

abstract:
  The nuclear index of refraction, the density of partons, their free path
length and energy loss in the matter created in heavy-ion collisions at RHIC
are estimated within the suggestion that the emission of Cherenkov gluons is
responsible for the observed two-bump structure of the angular distribution of
hadrons belonging to the companion (away-side) jet.


title: MSSM Higgs Boson Searches at LEP

abstract:
  Final results from the MSSM Higgs boson searches from the LEP experiments
ALEPH, DELPHI, L3 and OPAL are presented. The results are statistically
combined and the statistical significance for signal and background hypotheses
are given. Upper bounds on the production cross sections are set for several
Higgs-like topologies. Interpretations for six benchmark scenarios in the MSSM,
both for CP-conserving and CP-violating scenarios, are given. Limits on the
tan(beta) parameter, and in some scenarios upper limits on the neutral Higgs
boson masses are set.


title: Supersymmetric Theory of (Color)superconductivity

abstract: The supersymmetric theory of (color)superconductivity is investigated.


title: Gravitational Scattering in the ADD-model Revisited

abstract:
  Gravitational scattering in the ADD-model is studied and it is argued that no
cut-off is needed for the exchange of virtual Kaluza--Klein modes. By
introduction of a small coordinate in the extra dimensions a unique form of the
Kaluza--Klein-summed propagator is found for an odd number of extra dimensions.
The matrix element corresponding to this propagator can also (as opposed to the
cut-offed version) be Fourier transformed to position space, giving back the
extra-dimensional version of Newton's law. For an even number of extra
dimensions the propagator is found by requiring that Newton's law should be
recovered.


title: On the re-summation of enhanced Pomeron diagrams

abstract:
  Dominant contributions of enhanced Pomeron diagrams to elastic hadron-hadron
scattering amplitude are re-summed to all orders. The formalism is applied to
calculate total hadronic cross sections and elastic scattering slopes. An
agreement with earlier results is obtained.


title: Nonuniversal $Z^{\prime}$ couplings in B decays

abstract:
  We study the impacts of nonuniversal $Z^{\prime}$ model, providing flavor
changing neutral current at tree level, on the branching ratios (BRs), CP
asymmetries (CPAs) and polarization fractions of B decays. We find that for
satisfying the current data, the new left- and right-handed couplings have to
be included at the same time. The new introduced effective interactions not
only could effectively explain the puzzle of small longitudinal polarization in
$B\to K^* \phi$ decays, but also provide a solution to the small CPA of
$B^{\pm}\to \pi^{0} K^{\pm}$. We also find that the favorable CPA of
$B^{\pm}\to \pi^{0} K^{\pm}$ is opposite in sign to the standard model;
meanwhile, the CPA of $B_{d}\to \pi^{0}K$ has to be smaller than -10%. In
addition, by using the values of parameters which are constrained by $B\to \pi
K$, we find that the favorable ranges of BRs, CPAs, longitudinal polarizations,
and perpendicular transverse polarizations for $(B^{\pm}\to \rho^{\pm} K^{*},
B_{d}\to \rho^{\mp} K^{*\pm})$ are $(17.1\pm 3.9, 10.0\pm2.0)\times 10^{-6}$,
$(3\pm 5, 21\pm 7)%$, $(0.66\pm 0.10, 0.44\pm 0.08)$ and $(0.14\pm 0.10,
0.25\pm 0.09)$, respectively.


title: Matter of resolution: from quasiclassics to fine tuning

abstract:
  Recently, there appeared results of lattice measurements in Yang-Mills
theories which indicate non-trivial dependences on the lattice spacing of many
observables. In particular, volume occupied by fermionic zero modes shrinks to
zero in the continuum limit. These results are in apparent disagreement with
quasiclassical models which assume that all the non-perturbative effects
develop on the scale of $\Lambda_{QCD}$. We emphasize that this kind of
contradictions might be superficial since the results in point depend in fact
on the measurements procedure. The lattice simulations correspond to
measurements with high resolution while the quasiclassical picture assumes poor
resolution. We will argue that the general trend is that what looks
quasiclassical in measurements with poor resolution becomes fine tuned in
measurements with fine resolution. The main emphasis is on the topological
fermionic modes and we argue that shrinking of the volume occupied by the modes
could have been predicted theoretically.


title: Higher twists in polarized DIS and the size of the constituent quark

abstract:
  The spontaneous breaking of chiral symmetry implies the presence of a
short-distance scale in the QCD vacuum, which phenomenologically may be
associated with the "size" of the constituent quark, rho ~ 0.3 fm. We discuss
the role of this scale in the matrix elements of the twist-4 and 3 quark-gluon
operators determining the leading power (1/Q^2-) corrections to the moments of
the nucleon spin structure functions. We argue that the flavor-nonsinglet
twist-4 matrix element, f_2^{u - d}, has a sizable negative value of the order
rho^{-2}, due to the presence of sea quarks with virtualities ~ rho^{-2} in the
proton wave function. The twist-3 matrix element, d_2, is not related to the
scale rho^{-2}. Our arguments support the results of previous calculations of
the matrix elements in the instanton vacuum model. We show that this
qualitative picture is in agreement with the phenomenological higher-twist
correction extracted from an NLO QCD fit to the world data on g_1^p and g_1^n,
which include recent data from the Jefferson Lab Hall A and COMPASS
experiments. We comment on the implications of the short-distance scale rho for
quark-hadron duality and the x-dependence of higher-twist contributions.


title:
Analyticity and crossing symmetry of the eikonal amplitudes in gauge
  theories

abstract:
  After a brief review and a more refined analysis of some relevant analyticity
properties (when going from Minkowskian to Euclidean theory) of the high-energy
parton-parton and hadron-hadron scattering amplitudes in gauge theories,
described nonperturbatively, in the eikonal approximation, by certain
correlation functions of two Wilson lines or two Wilson loops near the light
cone, we shall see how these same properties lead to a nice geometrical
interpretation of the crossing symmetry between quark-quark and quark-antiquark
eikonal amplitudes and also between loop-loop eikonal amplitudes. This relation
between Minkowskian-to-Euclidean analyticity properties and crossing symmetry
is discussed in detail and explicitly tested in the first orders of
perturbation theory. Some nonperturbative examples existing in the literature
are also discussed.


title: Preheating with Trilinear Interactions: Tachyonic Resonance

abstract:
  We investigate the effects of bosonic trilinear interactions in preheating
after chaotic inflation. A trilinear interaction term allows for the complete
decay of the massive inflaton particles, which is necessary for the transition
to radiation domination. We found that typically the trilinear term is
subdominant during early stages of preheating, but it actually amplifies
parametric resonance driven by the four-legs interaction. In cases where the
trilinear term does dominate during preheating, the process occurs through
periodic tachyonic amplifications with resonance effects, which is so effective
that preheating completes within a few inflaton oscillations. We develop an
analytic theory of this process, which we call tachyonic resonance. We also
study numerically the influence of trilinear interactions on the dynamics after
preheating. The trilinear term eventually comes to dominate after preheating,
leading to faster rescattering and thermalization than could occur without it.
Finally, we investigate the role of non-renormalizable interaction terms during
preheating. We find that if they are present they generally dominate (while
still in a controllable regime) in chaotic inflation models. Preheating due to
these terms proceeds through a modified form of tachyonic resonance.


title: The problem of exotic states: view from complex angular momenta

abstract:
  Having in mind present uncertainty of the experimental situation in respect
to exotic hadrons, it is important to discuss any possible theoretical
arguments, pro and contra. Up to now, there are no theoretical ideas which
could forbid existence of the exotic states. Theoretical proofs for their
existence are also absent. However, there are some indirect arguments for the
latter case. It will be shown here, by using the complex angular momenta
approach, that the standard assumptions of analyticity and unitarity for
hadronic amplitudes lead to a non-trivial conclusion: the S-matrix has
infinitely many poles in the energy plane (accounting for all its Riemann
sheets). This is true for any arbitrary quantum numbers of the poles, exotic or
non-exotic. Whether some of the poles may provide physical (stable or
resonance) states, should be determined by some more detailed dynamics.


title: Physics Consequences of Extra-Dimensional Gauge-Higgs Unification

abstract:
  In the dynamical gauge-Higgs unification of electroweak interactions, the 4D
Higgs field is identified with the low energy mode of the extra-dimensional
component of the gauge potentials. In the Randall-Sundrum warped spacetime, in
particular, the Higgs boson mass is predicted in the range 120 GeV - 290 GeV.
The universality of weak interactions is slightly broken by magnitudes of
10^{-8}, 10^{-6} and 10^{-2} for \mu-e, \tau-e and t-e, respectively.


title:
Investigation of g_f0-rho-gamma and g_a0-rho-gamma coupling constants in
  light cone sum rules

abstract:
  We present a calculation of the coupling constant f0-->rho-gamma of and
a0-->rho-gamma decays from the point of the light cone QCD sum rules. We
estimate the coupling constants g_f0-rho-gamma and g_a0-rho-gamma which are an
essential ingredient in the analysis of physical processes involving isoscalar
f0(980) and isovector a0(980) mesons.


title: The contribution of strange quarks to the proton magnetic moment

abstract:
  This paper deals with how to extract the s-s(bar) contribution to the proton
magnetic moment from the experiments


title: Effects of Bulk Mass in Gauge-Higgs Unification

abstract:
  We study effects of bulk mass on electroweak symmetry breaking and Higgs mass
in the scenario of five dimensional SU(3) gauge-Higgs unification defined on
M^4\times S^1/Z_2. The asymptotic form of effective potential for the Higgs
field is obtained, from which a transparent and useful expression for the Higgs
mass is found. The small vacuum expectation values (VEV) for Higgs field can be
realized by choosing bulk mass parameters approriately for a fixed set of
matter content. The bulk mass for periodic fermion field, in general, has
effects to make the Higgs mass less heavy. On the other hand, the bulk mass for
antiperiodic field does not directly affect the Higgs mass, but it contributes
to increase or decrease the Higgs mass, depending on how small the VEV is
induced due to the antiperiodic field. We give numerical examples to confirm
these effects, in which the role of the bulk mass is also definitely clear.