title:
Measuring Supersymmetric Particle Masses at the LHC in Scenarios with
  Baryon-Number R-Parity Violating Couplings

abstract:
  The measurement of sparticle masses in the Minimal Supersymmetric Standard
Model at the LHC is analysed, in the scenario where the lightest neutralino
decays into three quarks. Such decays, occurring through the baryon-number
violating coupling lambda"\_ijk, pose a severe challenge to the capability of
the LHC detectors since the final state has no missing energy signature and a
high jet multiplicity. We focus on the case of non-zero lambda"\_212 which is
the most difficult experimentally. The proposed method is valid over a wide
range of SUGRA parameter space with lambda"\_212 between 10^{-5}-0.1.
Simulations are performed of the ATLAS detector at the Large Hadron Collider.
Using the lightest neutralino from the decay chain left-squark to quark +
next-to-lightest neutralino to right-slepton + lepton + quark and finally to
lightest neutralino + lepton pair + quark, we show that the lightest and
next-to-lightest neutralino masses can be measured by 3-jet and 3-jet + lepton
pair invariant mass combinations. At the SUGRA point M_0=100 GeV, M_{1/2}=300
GeV, A_0=300 GeV, tan beta=10, sign of mu positive and with lambda"\_212=0.005,
we achieve statistical (systematic) errors of 3 (3), 3 (3), 0.3 (4) and 5 (12)
GeV respectively for the masses of the lightest neutralino, next-to-lightest
neutralino, right-slepton and left-squark, with an integrated luminosity of 30
fb^{-1}.


title: A dynamical stabilization of the radion potential

abstract:
  Large extra dimensional theories attempt to solve the hierarchy problem by
assuming that the fundamental scale of the theory is at the electroweak scale.
This requires the size of the extra dimensions to be stabilized at a scale
which is determined by the effective four dimensional Planck mass and the
number of extra dimensions. In this paper we concentrate upon the dynamical
reasons to stabilize them by providing a running mass to the radion field. We
show that it is possible to maintain the size of the extra dimensions once it
is stabilized throughout the dynamics of inflation.


title: Sneutrino-induced like sign dilepton signal with conserved R-parity

abstract:
  Lepton number violation could be manifest in the sneutrino sector of
supersymmetric extensions of the standard model with conserved R-parity. Then
sneutrinos decay partly into the ``wrong sign charged lepton'' final state, if
kinematically accessible. In sneutrino pair production or associated single
sneutrino production, the signal then is a like sign dilepton final state.
Under favourable circumstances, such a signal could be visible at the LHC or a
next generation linear collider for a relative sneutrino mass-splitting of
order ${\cal O}(0.001)$ and sneutrino width of order ${\cal O}$(1 GeV). On the
other hand, the like sign dilepton event rate at the TEVATRON is probably too
small to be observable.


title:
Implications of BNL measurement of \delta a_{\mu} on scalar leptoquark
  mass and coupling

abstract:
  Recently BNL have measured the muon magnetic moment anomaly with increased
precision. The world average experimental value at present shows a discrepancy
of 43(16)\times 10^{-10} from the Standard Model value. In this paper we
investigate the implications of this difference on a class of scalar leptoquark
interactions to SM quark-lepton pair.
  We find that for leptoquarks in the few hundred Gev range the BNL muon
anomaly could arise from leptoquark couplings that are much smaller than the
electromagnetic coupling.
  We also find that the BNL value for the muon anomaly leads to an unambiguous
prediction for the electric dipole moment of the muon and a bound on the flavor
changing leptoquark coupling relevant for the rare decay \mu\to e\gamma.


title:
The Gegenbauer Polynomial Technique: the evaluation of complicated
  Feynman integrals

abstract:
  We discuss a progress in calculation of Feynman integrals which has been done
with help of the Gegenbauer Polynomial Technique and demonstrate the results
for most complicated parts of O(1/N^3) contributions to critical exponents of
\phi^4 -theory, for any spacetime dimensionality D.


title:
The Differential Equation Method: evaluation of complicated Feynman
  diagrams

abstract:
  We discuss a progress in calculation of Feynman integrals which has been done
with help of the Differential Equation Method and demonstrate the results for a
class of two-point two-loop diagrams.


title:
The LHC (CMS) Discovery Potential for Models with Effective
  Supersymmetry and Nonuniversal Gaugino Masses

abstract:
  We investigate squark and gluino pair production at LHC (CMS) with subsequent
decays into quarks, leptons and LSP in models with effective supersymmetry
where third generation of squarks is relatively light while the first two
generations of squarks are heavy. We consider the general case of nonuniversal
gaugino masses. Visibility of signal by an excess over SM background in (n \geq
2)jets + (m \geq 0)leptons + E^{miss}_T events depends rather strongly on the
relation between LSP, second neutralino, gluino and squark masses and it
decreases with the increase of LSP mass. We find that for relatively heavy
gluino it is very difficult to detect SUSY signal even for light 3^{rd}
generation squarks (m_{\tilde q_3}\le 1 TeV) if the LSP mass is closed to the
3^{rd} generation squark mass.


title: A nonsupersymmetric resolution of the anomalous muon magnetic moment

abstract:
  The recent result from the E821 experiment at BNL on the anomalous magnetic
moment of the muon shows a distinct discrepancy with the Standard Model
predictions. We calculate the additional correction that the anomalous magnetic
moment receives in a model with scalar leptoquarks. We find that such models
can account for the deviation from the SM value even for small leptoquark
couplings.


title: Coannihilation Effects in Supergravity and D-Brane Models

abstract:
  Coannihilation effects in neutralino relic density calculations are examined
for a full range of supersymmetry parameters including large \tan\beta and
large A_0 for stau, chargino, stop and sbottom coannihilation with the
neutralino. Supergravity models possessing grand unification with universal
soft breaking (mSUGRA), models with nonuniversal soft breaking in the Higgs and
third generation sparticles, and D-brane models with nonuniversal gaugino
masses were analysed. Unlike low \tan\beta where m_0 is generally small, stau
coannihilation corridors with high \tan\beta are highly sensitive to A_0, and
large A_0 allows m_0 to become as large as 1TeV. Nonuniversal soft breaking
models at high \tan\beta also allow the opening of a new annihilation channel
through the s-channel Z pole with acceptable relic density, allowing a new wide
band in the m_0-m_{1/2} plane with m_{1/2} >~ 400 GeV and $m_0$ rising to 1
TeV. The D-brane models considered possess stau coannihilations regions similar
to mSUGRA, as well as small regions of chargino coannihilation.
Neutralino-proton cross sections are analysed for all models and it is found
that future detectors for halo wimps will be able to scan essentially the full
parameter space with m_{1/2} < 1 TeV except for a region with \mu < 0 where
accidental cancellations occur when 5 ~<\tan\beta ~< 30. Analytic explanations
of much of the above phenomena are given. The above analyses include current
LEP bounds on the Higgs mass, large \tan\beta NLO correction to the b \to s
\gamma decay, and large \tan\beta SUSY corrections to the b and \tau masses.


title: Cosmology of Randall-Sundrum models

abstract:
  There are many interesting issues in the brane world with a large/warped
extra dimension. We focus on the cosmological aspects. We review the
cosmological solutions of the brane world and how the conventional
four-dimensional cosmology is recovered by including the effect of
stabilization. Its implications on the mass hierarchy and the cosmological
constant are discussed.


title: Frontiers of Inflationary Cosmology

abstract:
  After a brief review of the theory of cosmological perturbations, I highlight
some recent progress in the area of reheating in inflationary cosmology,
focusing in particular on parametric amplification of super-Hubble cosmological
fluctuations, and on the role of noise in the resonance dynamics (yielding a
new proof of Anderson localization). I then discuss several important
conceptual problems for the current realizations of inflation based on
fundamental scalar matter fields, and review some new approaches at solving
these problems.

categories: hep-ph astro-ph cond-mat.str-el gr-qc hep-th


title: Medium effects for terrestrial and atmospheric neutrino oscillations

abstract:
  Matter effects in neutrino propagation translate into effective parameters
for the oscillation and fake CP- and CPT-odd quantities, even in a scenario,
such as $\Delta_{12}=0$, where no genuine CP violation is present. This fact
seems to impose severe restrictions on the determination of intrinsic
parameters of the system from long-baseline experiments. We show, however, that
the resonance in the effective mixing $\tilde{\theta}_{13}$ can be observed for
a certain range of baselines. This provides a way to measure the vacuum mixing
angle $\theta_{13}$ and the sign of $\Delta m_{23}^2$ from atmospheric
neutrinos, using a detector with energy resolution and charge discrimination.


title: Quantum diffusion of magnetic fields in a numerical worldline approach

abstract:
  We propose a numerical technique for calculating effective actions of
electromagnetic backgrounds based on the worldline formalism. As a conceptually
simple example, we consider scalar electrodynamics in three dimensions to
one-loop order. Beyond the constant-magnetic-field case, serving as a benchmark
test, we analyze the effective action of a step-function-like magnetic field --
a configuration that is inaccessible to derivative expansions. We observe
magnetic-field diffusion, i.e., nonvanishing magnetic action density at space
points near the magnetic step where the classical field vanishes.


title: Inelastic Rescattering in $B \to \pi \pi, K \bar{K}$

abstract:
  Inelastic rescattering effects in B decays into a pair $PP$ of pseudoscalar
mesons ($PP = \pi \pi$ or $K\bar{K}$) are discussed. It is assumed that $B$
meson decays through a short-distance tree-diagram process into two jet-like
states composed of low-mass resonances $M_1 M_2$ which rescatter into $PP$. The
rescattering of resonance pair $M_1 M_2$ into the final $PP$ state is assumed
to proceed through a Regge flavour exchange. Since such processes constitute a
fraction,diminishing with increasing energy, of total inelastic $PP$
scattering, the inelastic rescattering contribution should die out for $m_B \to
\infty$. At $m_B = 5.2 ~GeV$, however, explicit estimates show that
rescattering corrections could be substantial, leading to long-distance
corrections to $B^0 \to K\bar{K}$, comparable to short-distance penguin
contributions.


title:
Reheating-temperature independence of cosmological baryon asymmetry in
  Affleck-Dine leptogenesis

abstract:
  In this paper we point out that the cosmological baryon asymmetry in our
universe is generated almost independently of the reheating temperature $T_R$
in Affleck-Dine leptogenesis and it is determined mainly by the mass of the
lightest neutrino, $m_{\nu_1}$, in a wide range of the reheating temperature
$T_R\simeq 10^5$--$10^{12}$ GeV. The present baryon asymmetry predicts the
$m_{\nu_1}$ in a narrow region, $m_{\nu_1}\simeq (0.3$--$1)\times 10^{-9}$ eV.
Such a small mass of the lightest neutrino leads to a high predictability on
the mass parameter $m_{\nu_e \nu_e}$ contributing to the neutrinoless double
beta decay. We also propose an explicit model in which such an ultralight
neutrino can be naturally obtained.


title: $\sigma^{tot}_{ee \gamma \gamma}$ at $e^+e^-$ colliders}

abstract:
  In this talk I briefly summarize different models for $\sigma^{tot}_{2
\gamma}$ ($e^+e^- \to \gamma \gamma \to$ hadrons) and contrast model
predictions with the data. I will then discuss the capability of the future
$e^+e^-$ and $\gamma \gamma$ colliders to distinguish between various models
and end with an outlook for future work.


title: The omega meson at high temperatures

abstract:
  The decays of the omega meson in a heat bath of thermally excited pions is
studied within the framework of real-time thermal field theory using an
appropriate effective Lagrangian. We show that the omega meson spectrum
broadens considerably at temperatures T > 100 MeV, primarily because of omega
pi -> pi pi reactions in the thermal environment.


title: Pion form factor in large $N_c$ QCD

abstract:
  The electromagnetic form factor of the pion is obtained using a particular
realization of QCD in the large $N_c$ limit, which sums up the infinite number
of zero-width resonances to yield an Euler's Beta function of the Veneziano
type. This form factor agrees with space-like data much better than single
rho-meson dominance. A simple unitarization ansatz is illustrated, and the
resulting vector spectral function in the time-like region is shown to be in
reasonable agreement with the ALEPH data from threshold up to about 1.3
${GeV}^2$.


title: SUSY and SUSY Breaking Scale at the Linear Collider

abstract:
  After summarising very briefly the key features of different model
predictions for sparticle masses and their relation with the supersymmetry
(SUSY) breaking scales and parameters, I discuss the capabilities of an $e^+
e^-$ Linear Collider (LC) with $\sqrt{s} \geq$ 500 GeV for precision
measurements of sparticle properties. Then I focus on the lessons one can learn
about the scale and mechanism of SUSY breaking from these measurements and
point out how LC can crucially complement and extend the achievements of the
LHC. I end by mentioning what would be the desired extensions in the
type/energy of the colliding particles and their luminosity from the point of
view of SUSY investigations.


title: Dileptons and photons from central heavy-ion collisions at CERN-SPS

abstract:
  A unique parameterization of secondary (thermal) dilepton and photon yields
in heavy-ion experiments at CERN-SPS is proposed. Adding those thermal yields
to background contributions the spectral shapes of the CERES/NA45, NA38, NA50,
HELIOS/3 and WA98 data from experiments with lead and sulfur beams can be well
described.


title: Muon Anomalous Magnetic Moment and Lepton Flavor Violation

abstract:
  A non-universal interaction, which involves only the third family leptons
induces lepton flavor violating couplings and contributes to the anomalous
magnetic moment of muon. In this paper, we study the effects of non-universal
interaction on muon (g-2) and rare decay $\tau \to \mu \gamma$ by using an
effective lagrangian technique, and a phenomenological $Z^\prime$ model where
$Z^\prime$ couples only to the third family lepton. We find that the deviation
from the theory can be explained and the induced $\tau \to \mu \gamma$ rate
could be very close to the current experimental limit. In the $Z^\prime$ model,
$M_{Z^\prime}$ has to be lighter than 2.6 TeV.


title: Self-Consistency Requirement in High-Energy Nuclear Scattering

abstract:
  Practically all serious calculations of exclusive particle production in
ultra-relativistic nuclear or hadronic interactions are performed in the
framework of Gribov-Regge theory or the eikonalized parton model scheme.
  It is the purpose of this paper to point out serious inconsistencies in the
above-mentioned approaches.
  We will demonstrate that requiring theoretical self-consistency reduces the
freedom in modeling high energy nuclear scattering enormously.
  We will introduce a fully self-consistent formulation of the
multiple-scattering scheme in the framework of a Gribov-Regge type effective
theory.
  In addition, we develop new computational techniques which allow for the
first time a satisfactory solution of the problem in the sense that calculation
s of observable quantities can be done strictly within a self-consistent
formalism.


title: O'Mega: An Optimizing Matrix Element Generator

abstract:
  We sketch the architecture of O'Mega, a new optimizing compiler for tree
amplitudes in quantum field theory, and briefly describe its usage. O'Mega
generates the most efficient code currently available for scattering amplitudes
for many polarized particles in the Standard Model and its extensions.


title: The scale of supersymmetry breaking as a free parameter

abstract:
  While supersymmetric extensions of the Standard Model can be fully described
in terms of explicitly broken global supersymmetry, this description is only
effective. Once related to spontaneous breaking in a more fundamental theory,
the effective parameters translate to functions of two distinct scales, the
scale of spontaneous supersymmetry breaking and the scale of its mediation to
the standard-model fields. The scale dependence will be written explicitly and
the full spectrum of supersymmetry breaking operators which emerges will be
explored. It will be shown that, contrary to common lore, scale-dependent
operators can play an important role in determining the phenomenology. For
example, theories with low-energy supersymmetry breaking, such as gauge
mediation, may correspond to a scalar potential which is quite different than
in theories with high-energy supersymmetry breaking, such as gravity mediation.
As a concrete example, the Higgs mass prediction will be discussed in some
detail and its upper bound will be shown to be sensitive to the supersymmetry
breaking scale.


title: Probing top flavour-changing neutral couplings at TESLA

abstract:
  We present a comprehensive analysis of the sensitivity of the TESLA e+ e-
collider to top flavour-changing neutral couplings to the Z boson and photon.
We study single top production and top decay processes, and we consider the
cases without beam polarization, with only e- polarization and with e- and e+
polarization. We show that the use of the latter substantially enhances the
sensitivity to discover or bound these vertices, and for some of the couplings
the expected LHC limits could be improved by factors 2-14 for equal running
times.


title: Drell-Yan Massive Lepton-Pair's Angular Distributions at Large $Q_T$

abstract:
  By measuring Drell-Yan massive lepton-pair's angular distributions, we can
identify the polarization of the virtual photon of invariant mass $Q$ which
decays immediately into the lepton-pair. In terms of a modified QCD
factorization formula for Drell-Yan process, which is valid even if $Q_T\gg Q$,
we calculate the massive lepton-pair's angular distributions at large $Q_T$. We
find that the virtual photons produced at high $Q_T$ are more likely to be
transversely polarized. We discuss the implications of this finding to the
J/$\psi$ mesons' polarization measured recently at Fermilab.


title:
Muon anomalous magnetic moment confronts exotic fermions and gauge
  bosons

abstract:
  We investigate the status of models containing exotic fermions or extra
Z-like neutral gauge bosons in the light of the recent data on anomalous
magnetic moment of muon. We find that it is possible to extract interesting
bounds on the parameters characterizing such models. The bounds are
particularly strong if the new flavour-changing neutral currents are axial
vectorlike.


title: Detectability of a subdominant density component of cold dark matter

abstract:
  Here we examine the detectability of collisionless dark matter candidates
that may constitute not all but only a subdominant component of galactic cold
dark matter. We show that current axion searches are not suited for a
subdominant component, while direct WIMP searches would not be severely
affected by the reduced density. In fact, the direct detection rates of
neutralinos stay almost constant even if neutralinos constitute 1% of the halo
dark matter. Only for lower densities do the rates decrease with density. Even
neutralinos accounting for only $10^{-4}$ of the local dark halo density are
within proposed future discovery limits. We comment also on indirect WIMP
searches.


title: Two-loop QCD corrections to gluon-gluon scattering

abstract:
  We present the O(alpha_s^4) virtual QCD corrections to gluon-gluon scattering
due to the interference of tree and two-loop amplitudes. We work in
conventional dimensional regularisation and give analytic expressions
renormalised in the MSbar scheme. The structure of the infrared divergences
agrees with that predicted by Catani while formulae for the finite remainder
are given in terms of logarithms and polylogarithms that are real in the
physical region. These results, together with those previously obtained for
quark-quark and quark-gluon scattering, complete the two-loop matrix elements
needed for the next-to-next-to-leading order contribution to inclusive jet
production at hadron colliders.


title: On the D^+ --> omega pi^+ decay

abstract:
  The D^+ --> omega + pi^+ decay is studied by decomposing its amplitude into a
sum of factorizable and non-factorizable ones. Its rate is predicted as a
function of mass and width of a hypothetical hybrid meson.


title: Investigation of a new analytic running coupling in QCD

abstract:
  The mathematical properties of the new analytic running coupling (NARC) in
QCD are investigated. This running coupling naturally arises under
``analytization'' of the renormalization group equation. One of the crucial
points in our consideration is the relation established between the NARC and
its inverse function. The latter is expressed in terms of the so-called Lambert
$W$ function. This relation enables one to present explicitly the NARC in the
renorminvariant form and to derive the corresponding $\beta$ function. The
asymptotic behavior of this $\beta$ function is examined. The consistent
estimation of the parameter $\Lambda_{QCD}$ is given.


title:
Recent Result from E821 Experiment on Muon g-2 and Unconstrained Minimal
  Supersymemtric Standard Model

abstract:
  Recently, the E821 experiment at the Brookhaven National Laboratory announced
their latest result of their muon g-2 measurement which is about 2.6-\sigma
away from the standard model prediction. Taking this result seriously, we
examine the possibility to explain this discrepancy by the supersymmetric
contribution. Our analysis is performed in the framework of the unconstrained
supersymmetric standard model which has free seven parameters relevant to muon
g-2. We found that, in the case of large \tan\beta, sparticle masses are
allowed to be large in the region where the SUSY contribution to the muon g-2
is large enough, and hence the conventional SUSY search may fail even at the
LHC. On the contrary, to explain the discrepancy in the case of small
\tan\beta, we found that (i) sleptons and SU(2)_L gauginos should be light, and
(ii) negative search for the Higgs boson severely constrains the model in the
framework of the mSUGRA and gauge-mediated model.


title: Atmospheric and Solar Neutrino Masses and Abelian Flavor Symmetry

abstract:
  Recent atmospheric and solar neutrino experiments suggest that neutrinos have
small but nonzero masses. They further suggest that mass eigenvalues have
certain degree of hierarchical structures, and also some mixing angles are
near-maximal while the others are small. We first survey possible explanations
for the smallness of neutrino masses. We then discuss some models in which the
hierarchical pattern of neutrino masses and mixing angles arises as a
consequence of U(1) flavor symmetries which would explain also the hierarchical
quark and charged lepton masses.


title: Chiral multiplets versus parity doublets in highly excited baryons

abstract:
  It has recently been suggested that the parity doublet structure seen in the
spectrum of highly excited baryons may be due to effective chiral restoration
for these states. We argue how the idea of chiral symmetry restoration high in
the spectrum is consistent with the concept of quark-hadron duality. If chiral
symmetry is effectively restored for highly-lying states, then the baryons
should fall into representations of $SU(2)_L\times SU(2)_R$ that are compatible
with the given parity of the states - the parity-chiral multiplets. We classify
all possible parity-chiral multiplets: (i) $(1/2,0)\oplus(0, 1/2)$ that contain
parity doublet for nucleon spectrum;(ii) $(3/2,0) \oplus (0, 3/2)$ consists of
the parity doublet for delta spectrum; (iii) $(1/2,1) \oplus (1, 1/2)$ contains
one parity doublet in the nucleon spectrum and one parity doublet in the delta
spectrum of the same spin that are degenerate in mass. Here we show that the
available spectroscopic data for nonstrange baryons in the $\sim$ 2 GeV range
is consistent with all possibilities, but the approximate degeneracy of parity
doublets in nucleon and delta spectra support the latter possibility with
excited baryons approximately falling into $(1/2,1) \oplus (1, 1/2)$
representation of $SU(2)_L\timesSU(2)_R$ with approximate degeneracy between
positive and negative parity $N$ and $\Delta$ resonances of the same spin.


title: Dipole formalism with heavy fermions

abstract:
  We extend the dipole formalism of Catani and Seymour to QCD processes
involving heavy fermions. We give the appropriate subtraction terms together
with their integrated counterpart. All calculations are done within dimensional
regularization. Our formulae can be used with three variants of dimensional
regularization (conventional dimensional regularization, the 't Hooft-Veltman
scheme or the four-dimensional scheme).


title:
Sensitivity to sgoldstino states at the future linear $e^+e^-$ and
  photon colliders

abstract:
  Sensitivity to the supersymmetric scalar states $\phi$ at the future linear
$e^+e^-$ and photon colliders is discussed. In particular it is illustrated a
search strategy for massive sgoldstinos, the supersymmetric partners of the
goldstino.


title: Wandzura-Wilczek approximation from generalized rotational invariance

abstract:
  We present the alternative way of derivation of the Wandzura-Wilczek
relations between the kinematical twist-3 and twist-2 functions, parameterizing
hadronic matrix element in two-photon processes $\gamma^{\star}\pi\to
\gamma\pi$ and $\gamma^{\star}\gamma\to\pi\pi$. The new equations, providing
the independence of the physical cross-sections on the choice of the light-cone
direction, are suggested and explored. The amplitude of
$\gamma^{\star}\gamma\to\pi\pi$ up to genuine twist-3 accuracy is found.


title: Search for Gluonic Mesons in Gluon Jets

abstract:
  We present a short survey of the theoretical expectations on glueballs and
hybrids as well as of the present phenomenological status. The possibility to
obtain new information on gluonic mesons from the study of gluon jets in
comparison to quark jets is discussed.


title:
Constraining new physics in the Tev range by the recent BNL measurement
  of (g-2)_{\mu}

abstract:
  In this paper we study the implications of the recent high precision
measurement of (g-2)_{\mu} by BNL on new heavy physics beyond the SM in a model
independent way. We find that if the new physics responsible for the muon
anomaly is due to d=6 direct operators then they could arise from the following
follwing three broad classes of new physics a) new particles in the few hundred
Gev range with weak gauge coupling b) strongly interacting particles and
resonances in the few Tev range and c) massive Kaluza-Klein modes of the
graviton in the Tev range with couplings to SM particles of the order of
${E\over (Tev)}$.


title: QED Corrections to the Scattering of Solar Neutrinos and Electrons

abstract:
  We discuss recent calculations of the O(alpha) QED corrections to the recoil
electron energy spectrum in neutrino electron scattering, and to the spectrum
of the combined energy of the recoil electron and a possible accompanying
photon emitted in the scattering process. We then examine the role of these
corrections in the interpretation of precise measurements from solar neutrino
electron scattering experiments.


title: The anomalous process gamma pi -> pi pi to two loops

abstract:
  The amplitude for the anomalous process gamma pi -> pi pi is evaluated to two
loops in the chiral expansion by means of a dispersive method. The two new
coupling constants that enter at this order are estimated via sum rules derived
from a non-perturbative chiral approach. With these coupling constants fixed,
the numerical results are given and compared with the available experimental
information.


title: Dilepton production in ultrarelativistic heavy ion collisions

abstract:
  We review the production of lepton pairs during high energy nuclear
collisions. We highlight the information being carried out of the hot and dense
strongly interacting medium. We describe the phenomenon of scalar-vector mixing
that can take place in a dense medium and suggest possible measurable
signatures of this effect in high energy heavy ion collisions.


title:
Implications of the Renormalization Group Equations in Three-Neutrino
  Models with Two-fold Degeneracy

abstract:
  We obtain a {\it complete set} of one-loop RGE's for a set of combinations of
neutrino parameters for the case of two-fold degenerate hierarchical
three-neutrino models. The requirement of consistency of exact solutions to
these RGE's with the two-fold degeneracy yields conditions which have
previously been obtained perturbatively/numerically. These conditions, in the
limit $|U_{e\nu_{3}}|=0$, are shown to lead to a strong cancellation in the
matrix element of neutrinoless double beta decay.


title: The Power of Brane-Induced Gravity

abstract:
  We study the role of the brane-induced graviton kinetic term in theories with
large extra dimensions. In five dimensions we construct a model with a
TeV-scale fundamental Planck mass and a {\it flat} extra dimension the size of
which can be astronomically large. 4D gravity on the brane is mediated by a
massless zero-mode, whereas the couplings of the heavy Kaluza-Klein modes to
ordinary matter are suppressed. The model can manifest itself through the
predicted deviations from Einstein theory in long distance precision
measurements of the planetary orbits. The bulk states can be a rather exotic
form of dark matter, which at sub-solar distances interact via strong 5D
gravitational force. We show that the induced term changes dramatically the
phenomenology of sub-millimeter extra dimensions. For instance, high-energy
constraints from star cooling or cosmology can be substantially relaxed.


title: Estimates of flavoured scalar production in B - decays

abstract:
  Estimates are presented for the branching ratios of several two-particle
B-meson decays into flavoured scalar mesons.


title:
Mixing of the CP Even and the CP Odd Higgs Bosons and the EDM
  Constraints

abstract:
  The mixing among the CP even and the CP odd neutral Higgs bosons of MSSM by
one loop induced effects in the presence of CP phases is investigated using
three different mechanisms to satisfy the EDM constraints, i.e., a fine tuning
of phases, a heavy sparticle spectrum, and the cancellation mechanism. It is
shown that if a mixing effect among the CP even and the CP odd Higgs bosons is
observed experimentally, then it is only the cancellation mechanism that can
survive under the naturalness constraint.


title:
Asymptotics of QCD Factorization in Exclusive Hadronic Decays of B
  Mesons

abstract:
  Using the renormalon calculus, we study the asymptotic behavior of the
perturbative expansion of the hard-scattering kernels entering the QCD
factorization formula for the nonleptonic weak decays B->D M, where M is a
light meson. In the ``large-beta_0 limit'', the kernels are infrared finite and
free of endpoint singularities to all orders of perturbation theory. The
leading infrared renormalon singularity corresponding to a power correction of
order Lambda/m_b vanishes if the light meson has a symmetric light-cone
distribution amplitude. We calculate the Borel transforms and the corresponding
momentum distribution functions of the hard-scattering kernels, and resum the
series of O(beta_0^{n-1} alpha_s^n) corrections to explore the numerical
significance of higher-order perturbative and power corrections. We also derive
explicit expressions for the O(beta_0 alpha_s^2) contributions to the kernels,
and for the renormalon singularities corresponding to power corrections of
order (Lambda/m_b)^2. Finally, we study the limit m_c->0 relevant to charmless
hadronic decays such as B->pi pi.


title: Physics Beyond SM at RHIC with Polarized Protons

abstract:
  The capabilities of RHIC with polarized protons to test the Lorentz structure
of electroweak interactions and also the properties of MSSM Higgs, should it be
discovered, are discussed.


title:
Diffractive eta_c photo-and electroproduction with the perturbative QCD
  Odderon

abstract:
  Using a set of new odderon states, we calculate their contribution to the
diffractive eta_c photo- and electroproduction process. Compared to previous
simple 3-gluon exchange calculations we find an enhancement of about one order
of magnitude in the cross section. The t-dependence of the cross section
exhibits a dip structure in the small t region.


title: The muon anomalous magnetic moment and a new light gauge boson

abstract:
  It is shown that the 2.6 $\sigma$ discrepancy between the predicted and
recently measured value of the anomalous magnetic moment of positive muons
could be explained by the existence of a new light gauge boson X with a mass
$M_X \leq O(5) GeV$. Phenomenological bounds on the X coupling are discussed.


title: Light-quark masses and renormalons

abstract:
  A brief review of the problem of the determination of light-quark masses from
QCD sum rules for the correlators of scalar and pseudoscalar currents is given.
Special attention is paid to the description of the large-$N_f$ results,
obtained in collaboration with Broadhurst and Maxwell, for the scalar
correlator, and estimates of its higher-order perturbative uncertainties within
the renormalon-inspired large-$\beta_0$ expansion in the $\overline{\rm MS}$
scheme are given. Brief discussion is presented of the results of calculations
of higher-order perturbative QCD corrections to the relation between pole and
$\overline{\rm MS}$-scheme running-quark masses. Their comparison with the
different estimates is also given.


title:
Resummation of target mass corrections in two-photon processes:
  twist-two sector

abstract:
  We develop a formalism for the resummation of target mass corrections in
off-forward two-photon amplitudes given by a chronological product of
electromagnetic currents, arising in e.g. deeply virtual Compton scattering.
The method is based on a relation of composite operators with a definite twist
to harmonic tensors, which form an irreducible representation of the Lorentz
group. We give an application of the framework for the matrix elements of
twist-two operators.


title: Top Quark Physics: Summary

abstract:
  This talk summarizes recent progress in top quark physics studies for high
energy linear electron-positron colliders as presented at the LCWS2000 Workshop
at Fermilab. New results were presented for top pair production at threshold
and in the continuum, as well as for top production at $\gamma\gamma$
colliders.


title: Progress Towards a Generator for BFKL Physics

abstract:
  In certain regions of phase space in jet production, large logarithms can
arise which are resummed by the BFKL equation. Linear colliders can potentially
be excellent places to study BFKL effects in jet production. We discuss an
approach to BFKL calculations which incorporates kinematic effects explicitly
and can be implemented in an event generator.


title:
Higgs production in hadron collisions: soft and virtual QCD corrections
  at NNLO

abstract:
  We consider QCD corrections to Higgs boson production through gluon-gluon
fusion in hadron collisions. Using the recently evaluated two-loop amplitude
for this process and the corresponding factorization formulae for soft-gluon
bremsstrahlung at O(alpha_s^2), we compute the soft and virtual contributions
to the NNLO cross section. We also discuss soft-gluon resummation at
next-to-next-to-leading logarithmic accuracy. Numerical results for Higgs boson
production at the LHC are presented.


title:
Large Mixing Angle MSW Solution in an SU(3)_LxU(1)_N Gauge Model with
  Two-loop Radiative Mechanism

abstract:
  An SU(3)_L x U(1)_N gauge model, where E^{-i} (i=1,2,3) as heavy leptons are
placed in the third member of lepton triplets, is shown to provide the large
mixing angle (LMA) MSW solution to the solar neutrino problem. By introducing
approximate conservation of L_e-L_mu-L_tau (\equiv L') into the model, we have
estimated \Delta m_\odot^2 \sim \sqrt{2}\epsilon \Delta
m_{atm}^2m_{E^1}/(m_{E^2}+m_{E^3}), where \epsilon represents L'-breaking
effects and m_{E^i} is a mass of E^{-i}. Since \Delta m_{atm}^2 \sim 3 x
10^{-3} eV^2, the LMA solution is obtained for \epsilon\sim 0.01-0.1 in the
case of m_{E^1} \sim m_{E^{2,3}}. This mechanism utilizes two-loop radiative
mechanism, which contains a triplet version of the singly charged Zee boson,
h^+, given by \xi = (\xi^{++}, {\bar \xi}^+, h^+)^T. Almost bimaximal mixing is
dynamically realized by the approximate equality between the \xi-couplings of
the first family to the second and third families.


title:
The generalized vector dominance/colour-dipole picture of deep-inelastic
  scattering at low x

abstract:
  We give a detailed account of the recently formulated generalized vector
dominance/colour-dipole picture (GVD/CDP) of deep-inelastic scattering at low
$x\cong Q^2/W^2$, including photoproduction. The approach, based on $\gamma^*(q
\bar q)$ transitions, $q \bar q$ propagation and diffractive $(q \bar q)p$
scattering via the generic structure of the two-gluon exchange, provides a
unique and quantitatively successful theory for the $\gamma^* p$ total cross
section, $\sigma_{\gamma^* p} (W^2,Q^2)$, at low $x$. The GVD/CDP is shown to
imply the empirical low-$x$ scaling law, $\sigma_{\gamma^* p}
(W^2,Q^2)=\sigma_{\gamma^* p} (\eta)$ with $\eta=(Q^2+m_0^2)/\Lambda^2(W^2)$,
that was established by a model-independent analysis of the experimental data.


title: Multiple Parton Scattering in Nuclei: Parton Energy Loss

abstract:
  Multiple parton scattering and induced parton energy loss is studied in
deeply inelastic scattering (DIS) off nuclei. The effect of multiple scattering
of a highly off-shell quark and the induced parton energy loss is expressed in
terms of the modification to the quark fragmentation functions. We derive such
modified quark fragmentation functions and their QCD evolution equations in DIS
using generalized factorization of higher twist parton distributions. We
consider double-hard, hard-soft parton scattering as well as their
interferences in the same framework. The final result, which depends on both
the diagonal and off-diagonal twist-four parton distributions in nuclei,
demonstrates clearly the Landau-Pomeranchuk-Migdal interference features and
predicts a unique nuclear modification of the quark fragmentation functions.


title: One-loop integrals with XLOOPS-GiNaC

abstract:
  We present a new algorithm for the reduction of one-loop tensor Feynman
integrals within the framework of the XLOOPS project, covering both
mathematical and programming aspects. The new algorithm supplies a clean way to
reduce the one-loop one-, two- and three-point Feynman integrals with arbitrary
tensor rank and powers of the propagators to a basis of simple integrals. We
also present a new method of coding XLOOPS in C++ using the GiNaC library.


title:
QCD and Multiparticle Production - The Status of the Perturbative
  Cascade

abstract:
  I discuss recent developments in the QCD cascade formalism. I focus on the
importance of and uncertainties in higher order corrections to the Modified
Leading Log approximation for final-state radiation. I also talk about the CCFM
and LDC evolution equations for initial-state radiation in DIS.


title: Atomic Parity-Violation and Precision Physics

abstract:
  The atomic parity-violation (APV) parameter QW for a nucleus with `n'
neutrons and `z' protons has been included in the list of pseudo-observables
accessible with the codes TOPAZ0 and ZFITTER. In this way one can add the APV
results in the LEP EWWG `global' electroweak fits, checking the corresponding
effect when added to the existing precision measurements.


title:
Frequentist analyses of solar neutrino data (updated including KamLAND
  and SNO data)

abstract:
  The solar neutrino data are analyzed in a frequentist framework, using the
Crow-Gardner and Feldman-Cousins prescriptions for the construction of
confidence regions. Including in the fit only the total rates measured by the
various experiments, both methods give results similar to the commonly used
Delta chi^2-cut approximation. When fitting the full data set, the Delta
chi^2-cut still gives a good approximation of the Feldman-Cousins regions.
However, a careful statistical analysis significantly reduces the
goodness-of-fit of the SMA and LOW solutions.
  In the addenda we discuss the implications of the latest KamLAND, SNO and SK
data.


title: Is a Coherent Picture of Massive Neutrinos Emerging?

abstract:
  The hypothesis that neutrinos are massive has a strong experimental support;
however, the information we have is quite limited, and many possibilities are
open. Theoretical considerations might help fill the gaps (or foresee
regularities), as we illustrate with a specific example.


title:
Expected Properties of Massive Neutrinos for Mass Matrices with a
  Dominant Block and Random Coefficients Order Unity

abstract:
  We study the class of neutrino mass matrices with a dominant block but
unspecified O(1) coefficients, and scan the possible models by the help of
random number generators. We discuss which are the most common expectations in
dependence of the adjustable parameter of the mass matrices, "epsilon", and
emphasise an interesting sub-class of models that have large mixing angles for
atmospheric and solar neutrinos. For those models where the lepton mass
matrices are subject to Froggatt-Nielsen U(1) selection rules, we show that the
neutrino mixing matrix receives important contributions from the rotations
operating on charged lepton sector, which increase the predicted value of the
angle "theta(13)" and the ee-entry of the neutrino mass.


title:
Nonperturbative corrections to the Drell-Yan transverse momentum
  distribution

abstract:
  We study nonperturbative corrections to the transverse momentum distribution
of vector bosons in the Drell-Yan process. Factorizing out the Sudakov effects
due to soft gluons we express their contribution to the distribution in the
form of the vacuum averaged Wilson loop operator. We calculate the
nonperturbative contribution to the Sudakov form factor using the expansion of
the Wilson loop over vacuum fields supplemented with the expression for
nonlocal gauge invariant field strength correlator. Although the Wilson loop is
defined in an essentially Minkowski kinematics, the part of the nonperturbative
contribution depending on the invariant mass of the produced vector bosons is
governed by asymptotics of the correlator at large space-like (Euclidean)
separations and therefore can be calculated using conventional nonperturbative
methods. Applying the results of lattice calculations we found that the
obtained expression for the nonperturbative power corrections is in qualitative
agreement with known phenomenological expressions at large transverse momenta
and deviate from them at small transverse momenta.


title: Muon Anomalous Magnetic Moment and Leptoquark Solutions

abstract:
  The recent measurement on the muon anomalous magnetic moment $a_\mu$ shows a
$2.6\sigma$ deviation from the standard model value. We show that it puts an
interesting bound on the mass of the second generation leptoquarks. To account
for the data the leptoquark must have both the left- and right-handed couplings
to the muon. Assuming that the couplings have electromagnetic strength, the
mass is restricted in the range $0.7 {\rm TeV} < M_{\rm LQ} < 2.2$ TeV at 95%
C.L. We also discuss constraints coming from other low energy and high energy
experiments. If the first-second-generation universality is assumed,
constraints come from the atomic parity violation and charged-current
universality. We show that coexistence with other leptoquarks can satisfy these
additional constraints and at the same time do not affect the $a_\mu$.


title:
Once again on electromagnetic properties of a domain wall interacting
  with charged fermions

abstract:
  The response to a magnetic flux is considered of the vacuum state of charged
Dirac fermions interacting with a domain wall made of a neutral spinless field
in (3+1) dimensions with the fermion mass having a phase variation across the
wall. It is pointed out that due to simple C parity arguments the spontaneous
magnetization for this system is necessarily zero, thus invalidating some
claims to the contrary in the literature. The cancellation of the spontaneous
magnetization is explicitly demonstrated in a particular class of models. The
same calculation produces a general formula for the electric charge density
induced by the magnetic flux -- an effect previously discussed in the
literature for axionic domain walls. The distribution of the induced charge is
calculated in specific models.


title: Melosh Construction Of Relativistic Three-Quark Baryon Wave Functions

abstract:
  A method for constructing a complete set of relativistic three-quark states
in light front dynamics is implemented for the nucleon, N$^*$(1520) and
N$^*$(1535). This approach facilitates constructing states containing virtual
antiquarks. A physical interpretation is provided in terms of transition
amplitudes from quark to quark-gluon or quark-Goldstone boson Fock states of
chiral dynamics generated by flux tube breaking expected in QCD at intermediate
distances.


title: Soft and virtual corrections to pp -> H + X at NNLO

abstract:
  The contributions of virtual corrections and soft gluon emission to the
inclusive Higgs production cross section pp -> H + X are computed at
next-to-next-to-leading order in the heavy top quark limit. We show that this
part of the total cross section is well behaved in the sense of perturbative
convergence, with the NNLO corrections amounting to an enhancement of the NLO
cross section by \sim 5% for LHC and 10-20% for the Tevatron. We compare our
results with an existing estimate of the full NNLO effects and argue that an
analytic evaluation of the hard scattering contributions is needed.


title: Anomalous Magnetic Moment of the Muon in a Composite Model

abstract:
  We make a fresh evaluation of contributions to (g-2) of the muon in the
framework of a preonic model with coloured vectorlike leptons and heavy
coloured Z bosons and discuss their implications in the light of the recent
Brookhaven measurement. It is shown that the observed deviation can be
explained within this framework with masses and couplings consistent with all
constraints.


title: Muon anomalous magnetic moment in string inspired extended family models

abstract:
  We propose a standard model minimal extension with two lepton weak SU(2)
doublets and a scalar singlet to explain the deviation of the measured
anomalous magnetic moment of the muon from the standard model expectation. This
scheme can be naturally motivated in string inspired models such as E_6 and
AdS/CFT.


title: The Thomas rotation

abstract:
  We review why the Thomas rotation is a crucial facet of special relativity,
that is just as fundamental, and just as "unintuitive" and "paradoxical", as
such traditional effects as length contraction, time dilation, and the
ambiguity of simultaneity. We show how this phenomenon can be quite naturally
introduced and investigated in the context of a typical introductory course on
special relativity, in a way that is appropriate for, and completely accessible
to, undergraduate students. We also demonstrate, in a more advanced section
aimed at the graduate student studying the Dirac equation and relativistic
quantum field theory, that careful consideration of the Thomas rotation will
become vital as modern experiments in particle physics continue to move from
unpolarized to polarized cross-sections.


title: A Study of Light Mesons on the Transverse Lattice

abstract:
  We present results from a study of light meson spectra and structure obtained
within the framework of light-front QCD formulated on a transverse lattice. We
discuss how imposing Lorentz covariance conditions on meson dispersion
relations allows determination of parameters in the transverse lattice
Hamiltonian. The pion distribution amplitude obtained in this framework is
rather close to its asymptotic shape.


title: A Model for Neutrino Warm Dark Matter and Neutrino Oscillations

abstract:
  The muon- and tau-neutrinos with the mass in the keV range, which are allowed
in a low reheating temperature cosmology, can compose the warm dark matter of
the universe. A model of four light neutrinos including the keV scale $\nu_\mu$
and $\nu_\tau$ is studied, which combines the seesaw mechanism and the Abelian
flavor symmetry. The atmospheric neutrino anomaly is due to the
$\nu_\mu-\nu_\tau$ oscillation. The solar neutrino problem is answered by the
oscillation into the light sterile neutrino, where the SMA, LMA, and LOW-QVO
solutions can be accommodated in our scenario.


title:
Improved Calculation of F2 in Electroproduction and xF3 in Neutrino
  Scattering to NNLO and Determination of alpha_s

abstract:
  We improve the existing calculations of deep inelastic scattering to next to
next to leading order in the following manner. First, we use the recently
calculated values of the anomalous dimensions for moments with index n=10,12 in
ep scattering. Second, we use also recently calculated anomalous dimensions for
n=1,3,...,13 for xF3 in neutrino N scattering, to extend the calculation to
this process. Lastly, we use the determinantal constraints on the moments that
follow from positivity of the structure functions to stabilize the fits. We
find substantial improvement over previous results, getting the following
numbers: Lambda(n_f=4, 3 loops)= 274 \pm 20 MeV, alpha_s^{3
loops}(M_Z^2)=0.1166 \pm 0.0013 and chi^2/dof= 92/(153-18) from ep and, from
\nu N, Lambda(n_f=4, 3 loops)=255 \pm 72 MeV, alpha_s^{3 loops}(M_Z^2)=0.1153
\pm 0.0063 and chi^2/dof=0.335/(64-7). The errors take into account
experimental errors and higher twist effects among other estimated theoretical
errors. We can also extrapolate the fit, made originally for the range 3.5 <
Q^2 < 230 GeV^2 to higher momenta, obtaining very good reproduction of
experimental data up to Q^2=5000 GeV^2. From this, in particular, we can
exclude supersymmetric partners (squarks or gluinos) for masses up to some 60
GeV. The fitted value of the coupling is now, including the data at high Q^2,
alpha_s^{3 loops}(M_Z^2)=0.1163 \pm 0.0014.


title: Phase transition between three- and two-flavor QCD?

abstract:
  We explore the possibility that QCD may undergo a phase transition as a
function of the strange quark mass. This would hint towards models with
``spontaneous color symmetry breaking'' in the vacuum. For two light quark
flavors we classify possible colored quark-antiquark, diquark and gluon
condensates that are compatible with a spectrum of integer charged states and
conserved isospin and baryon number. The ``quark mass phase transition'' would
be linked to an unusual realization of baryon number in QCD$_2$ and could be
tested in lattice simulations. We emphasize, however, that at the present stage
the Higgs picture of the vacuum cannot predict a quark mass phase transition -
a smooth crossover remains as a realistic alternative. Implications of the
Higgs picture for the high density phase transition in QCD$_2$ suggest that
this transition is characterized by the spontaneous breaking of isospin for
nuclear and quark matter.


title: On the quest for unification - simplicity and antisimplicity

abstract:
  The road towards unification of elementary interactions is thought to start
on the solid ground of a universal local gauge principle. I discuss the
different types of bosonic gauge symmetries in gravitational and
nongravitational (standard model) interactions and their extensions both
fermionic, bosonic and with respect to space-time dimensions. The apparently
paradoxical size and nature of the cosmological constant is sketched, which at
first sight does not readily yield a clue as to the envelopping symmetry
structure of a unified theory. Nevertheless a tentative outlook is given
encouraging to proceed on this road.


title: Form factor of \pi^0-->\gamma\gamma^*

abstract:
  An intrinsic form factor has benn found and the slope of the form factor has
been predicted.


title: The Pure Leptonic Decays of $D_s$ Meson and Their Radiative Corrections

abstract:
  The radiative corrections to the pure leptonic decay $D_s{\longrightarrow}
{\ell}{{\nu}}_{\ell}$ up-to one-loop order is presented. We find the virtual
photon loop corrections to $D_s{\longrightarrow} {\tau}{{\nu}}_{\tau}$ is
negative and the corresponding branching ratio is larger than $3.51\times
10^{-3}$. Considering the possible experimental resolutions, our prediction of
the radiative decay $D_s{\longrightarrow} {\tau}{{\nu}}_{\tau}\gamma$ is not so
large as others, and the best channel to determine the $V_{cs}$ or $f_{D_s}$ is
$D_s{\longrightarrow} {\mu}{{\nu}}_{\mu}{\gamma}$. How to cancel the infrared
divergences appearing in the loop calculations, and the radiative decay
$D_s{\longrightarrow} {\ell}{{\nu}}_{\ell}{\gamma}$ is shown precisely. It is
emphasized that the radiative decay may be separated properly and may compare
with measurements directly as long as the theoretical `softness' of the photon
corresponds to the experimental resolutions.


title: 4-Neutrino mass schemes and the likelihood of (3+1)-mass spectra

abstract:
  We examine the (3+1)-class of 4-neutrino mass spectra within a rigorous
statistical analysis based on the Bayesian approach to probability. The data of
the Bugey, CDHS and KARMEN experiments are combined by using a likelihood
function. Our statistical approach allows us to incorporate solar and
atmospheric neutrino data and also the result of the CHOOZ experiment via
inequalities which involve elements of the neutrino mixing matrix and are
derived from these data. For any short-baseline $\Delta m^2$ we calculate a
bound on the LSND transition amplitude $A_{\mu;e}$ and find that, in the
$\Delta m^2$--$A_{\mu;e}$ plane, there is no overlap between the 99% CL region
allowed by the latest LSND analysis and the region allowed by our bound on
$A_{\mu;e}$ at 95% CL; there are some small overlap regions if we take the
bound at 99% CL. Therefore, we conclude that, with the existing data, the
(3+1)-neutrino mass spectra are not very likely. However, treating the
(2+2)-spectra with our method, we find that they are well compatible with all
data.


title: Top quark production in e+e- annihilation

abstract:
  We analyze the four-fermion reactions e+e- -> 4f containing a single top
quark and three other fermions, a possible decay product of the resonant
anti-top quark, in the final state. This allows us to estimate the contribution
of the nonresonant Feynman graphs and effects related to the off mass shell
production and decay of the top quark. We test the sensitivity of the total
cross section at centre of mass energies in the t tbar threshold region and far
above it to the variation of the top quark width. We perform calculation in an
arbitrary linear gauge in the framework of the Standard Model and discuss an
important issue of gauge symmetry violation by the constant top quark width.


title: The Adler Function for Light Quarks in Analytic Perturbation Theory

abstract:
  The method of analytic perturbation theory, which avoids the problem of
ghost-pole type singularities and gives a self-consistent description of both
spacelike and timelike regions, is applied to describe the "light" Adler
function corresponding to the non-strange vector channel of the inclusive decay
of the $\tau$ lepton. The role of threshold effects is investigated. The
behavior of the quark-antiquark system near threshold is described by using a
new relativistic resummation factor. It is shown that the method proposed leads
to good agreement with the ``experimental'' Adler function down to the lowest
energy scale.


title:
Neutrino Mass, Muon Anomalous Magnetic Moment, and Lepton Flavor
  Nonconservation

abstract:
  If the generating mechanism for neutrino mass is to account for both the
newly observed muon anomalous magnetic moment as well as the present
experimental bounds on lepton flavor nonconservation, then the neutrino mass
matrix should be almost degenerate and the underlying physics be observable at
future colliders. We illustrate this assertion in two specific examples, and
show that $\Gamma (\mu \to e \gamma)/m_\mu^5$, $\Gamma (\tau \to e
\gamma)/m_\tau^5$, and $\Gamma (\tau \to \mu \gamma) /m_\tau^5$ are in the
ratio $(\Delta m^2)_{sol}^2/2$, $(\Delta m^2)_{sol}^2 /2$, and $(\Delta
m^2)_{atm}^2$ respectively, where the $\Delta m^2$ parameters are those of
solar and atmospheric neutrino oscillations and bimaximal mixing has been
assumed.


title:
Nonlinear Response from Transport Theory and Quantum Field Theory at
  Finite Temperature

abstract:
  We study nonlinear response in weakly coupled hot $\phi^4$ theory. We obtain
an expression for a quadratic shear viscous response coefficient using two
different formalisms: transport theory and response theory. The transport
theory calculation is carried out by assuming a local equilibrium form for the
distribution function and expanding in the gradient of the local four
dimensional velocity field. By doing a gradient expansion on the Boltzmann
equation we obtain a hierarchy of equations for the coefficients of this
expansion.To do the response theory calculation we use Zubrave's techniques in
nonequilibrium statistical mechanics to derive a generalized Kubo formula.
Using this formula allows us to obtain the quadratic shear viscous response
from the three-point retarded green function of the viscous shear stress
tensor. We use the closed time path formalism of real time finite temperature
field theoryto show that this three-point function can be calculated using
equilibrium quantum field theory by writing it as an integral equation
involving a four-point vertex. This four-point vertex can in turn be obtained
from an integral equation which represents the resummation of an infinite
series of ladder and extended-ladder diagrams.The connection between transport
theory and response theory is made when we show that the integral equation for
this four-point vertex has exactly the same form as the equation obtained from
the Boltzmann equation for the coefficient of the quadratic term of the
gradient expansion of the distribution function.


title: The Running Coulomb Potential and Lamb Shift in QCD

abstract:
  The QCD beta-function and the anomalous dimensions for the Coulomb potential
and the static potential first differ at three loop order. We evaluate the
three loop ultrasoft anomalous dimension for the Coulomb potential and give the
complete three loop running. Using this result, we calculate the leading
logarithmic Lamb shift for a heavy quark-antiquark bound state, which includes
all contributions to the binding energies of the form m\alpha_s^4(\alpha_s
ln\alpha_s)^k, k\ge 0.


title:
Property of Chiral Scalar and Axial-Vector Mesons in Heavy-Light Quark
  System

abstract:
  We investigate the properties of new scalar X_B, X_D and axial-vector X_B*,
X_D* mesons, which are recently predicted, in the covariant
meson-classification scheme, to exist as the partners of ground-state
pseudoscalar B, D and vector B*, D* mesons, respectively, realizing a linear
representation of chiral symmetry for the light quark component in
heavy-light-quark meson system. The mass splittings between the respective
chiral partners are shown to be equal, and the decay widths of one pion
emission of X_B, X_D, X_B* and X_D* become to have a common value, due to
chiral and heavy quark symmetry.


title: Muon anomalous magnetic moment in technicolor models

abstract:
  Contributions to the muon anomalous magnetic moment are evaluated in the
technicolor model with scalars and topcolor assisted technicolor model. In the
technicolor model with scalars, the additional contributions come from the
loops of scalars, which were found sizable only for a very large $f/f^{'}$
disfavored by the experiment of $b\to s\gamma$. The topcolor effect is also
found to be large only for an unnaturally large $\tan\theta'$, and thus the
previously evaluated loop effects of extended technicolor bosons, suppressed by
$m_{\mu}^2/M_{ETC}^2$, must be resorted to account for the E821 experiment. So,
if the E821 experiment result persists, it would be a challenge to technicolor
models.


title: Vector and axial-vector correlators in a chirally symmetric model

abstract:
  We present a chirally symmetric hadronic model for the vector and
axial-vector correlators in vacuum. The dominant contributions to these
correlators come from intermediate pions, rho and a_1 mesons which are
calculated in one-loop approximation. The resulting spectral functions are
compared with the data obtained by the ALEPH collaboration from tau decay. In
the vector channel we find good agreement up to q^2 = 1 GeV^2, in the
transverse axial-vector channel up to q^2 = 2 GeV^2, corresponding to the
regimes dominated by two-pion or three-pion decay channels, respectively. The
longitudinal axial correlator is in almost perfect agreement with the PCAC
result.


title: A gauge invariant formulation of intrinsically nonperturbative QCD

abstract:
  Using a system of the corresponding Schwinger-Dyson equations of motion, a
pure dynamical theory of quark confinement and spontaneous breakdown of chiral
symmetry is formulated. It is based on dominated in the QCD vacuum
self-interaction of massless gluons only, i.e., without involving some extra
degrees of freedom. This interaction becomes strongly singular in the deep
infrared domain leading thus to the enhancement of zero momentum modes in the
nonperturbative QCD vacuum. Using theory of distributions, complemented by the
dimensional regularization method, we have explicitly shown that strong
infrared singularities can be put under control. In this way a new phase in
QCD, intrinsically nonperturbative QCD which is manifestly gauge invariant, was
discovered. As a result, a highly nontrivial dynamical and topological
structure of the QCD vacuum has emerged within our approach. We have also
explicitly shown how infrared multiplicative renormalization program should be
done in order to self-consistently remove all the strong infrared singularities
from the theory. The corresponding convergence conditions play a crucial role
in this program. In this theory any physical observables are determined by such
correlation functions from which all types of the perturbative contributions
should be subtracted, by definition. Theory is not only infrared finite but it
is free from the ultraviolet divergences as well. It has a mass gap $\Delta >
0$, i.e., there are no physical states in the interval $(0, \Delta)$. It
explains confinement, spontaneous breakdown of chiral symmetry and other
nonperturbative effects on a general ground and in self-consistent way.


title: HERA Small-x and/or Diffraction

abstract:
  Recent HERA data on small-x structure functions as well as DIS diffraction
and diffractive vector meson production are presented. The relationship between
these processes and possible indications of dynamics beyond the DGLAP formalism
are discussed.


title: Net-Baryon fluctuations at the QCD critical point

abstract:
  In the vicinity of the quark-hadron critical point, in the phase diagram of
QCD, simple power-law relations constrain the mid-rapidity net-baryon density
profile, for different heavy-ion processes, in a unifying scheme. The
corresponding scaling variable specifies the proximity of a given experiment to
the critical point. An important phenomenological aspect of the critical
properties in the baryonic sector is the possibility to observe intermittency
effects in the phase space distribution of net baryons.


title: Nonthermal production of gravitinos and inflatinos

abstract:
  We explicitly calculate nonthermal gravitino production during the preheating
period in the inflationary Universe. Contrary to earlier investigations, we
consider a two--field model to separate the mechanisms of supersymmetry
breaking and inflation. We show that the superpartner of the inflaton is
significantly generated, while the gravitino production is considerably
smaller. Nonthermal production of gravitinos seems thus less worrisome than
recently claimed.


title:
Majorana Neutrinos, Neutrino Mass Spectrum, CP-Violation and
  Neutrinoless Double Beta-Decay: I. The Three-Neutrino Mixing Case

abstract:
  Assuming mixing of three massive Majorana neutrinos, we study the
implications of the neutrino oscillation solutions of the solar and atmospheric
neutrino problems and of the results of the CHOOZ experiment for the
predictions of the effective Majorana mass in neutrinoless double beta decay,
|< m >|. The general case of CP-nonconservation is investigated. The predicted
values of |< m >|, depend strongly on the type of the neutrino mass spectrum,
on the solution of the solar neutrino problem, as well as on the values of the
two Majorana CP-violating phases, present in the lepton mixing matrix. We find
that i) $|< m >| \lesssim 0.02 $eV for a hierarchical neutrino mass spectrum,
ii) $|< m >| \lesssim 0.09 $eV if the spectrum is of the inverted hierarchy
type, and iii) $|< m >| \leq m$ in the case of three quasi-degenerate
neutrinos, m > 0 being the common neutrino mass scale which is limited by the
bounds from the $^3$H $\beta-$decay experiments, $m < 2.5 $eV. The observation
of the $(\beta \beta)_{0\nu}-$decay with a rate corresponding to $|< m >|
\gtrsim 0.02 $eV can provide unique information on the neutrino mass spectrum
and on the CP-violation in the lepton sector, and if CP-invariance holds - on
the relative CP-parities of the massive Majorana neutrinos.


title: Pade approximation to fixed order QCD calculations

abstract:
  Pade approximations appear to be a powerful tool to extend the validity range
of expansions around certain kinematical limits and to combine expansions of
different limits to a single interpolating function. After a brief outline of
the general method, we will review a number of recent applications and describe
the modifications that have to be applied in each case. Among these
applications are the MS-bar/on-shell conversion factor for quark masses and the
top decay rate at NNLO in QCD.


title:
Hadron-Hadron Interactions in the Constituent Quark Model: Results and
  Extensions

abstract:
  Hadronic interactions are discussed within the context of the constituent
quark model. The "Quark Born Diagram" methodology is outlined, extensive
applications to meson-meson and meson-baryon interactions are discussed, and
general features of these interactions are highlighted. The second half of this
document deals with shortcomings of the quark model approach and methods to
overcome them. These include relativistic kinematics, unitarity, nonlocal
potentials, coupled channel effects, and the chiral nature of the pion.


title:
Fundamentals of the Orbital Conception of Elementary Particles and of
  their Application to the Neutron and Nuclear Structure

abstract:
  An alternative approach to the Standard Model is outlined, being motivated by
the increasing theoretical and experimental difficulties encountered by this
model, which furthermore fails to be unitary. In particular, the conceptual
uneasiness generated by the excessive multiplicity of fundamental elements of
the Quark Model, 36 different quarks whose cohesion needs 8 different types of
gluons, has logically led some physicists to propose a variety of quark
substructures in an effort to reach unity. In order to avoid the forward escape
corresponding to the attribution of a substructure to quarks and to stand away
from the conceptual strangling to which the Standard model has led, we have
instead opted for different fundamentals. These, in contrast to those of the
Standard Model, are extremely simple and based on the assumption of a single
fundamental corpuscle, of dual manifestation as corpuscle and anticorpuscle, to
which is always associated an orbital that determines the structure of
particles. In such a frame particles differentiate through the diversity of
quantum states of their structuring orbital, in contrast to the strategy used
by the Standard Model based instead on the particle's multiplicity of
composition through the variety of the quark's content, furthermore limited to
hadrons. Instead the orbital conception of particles is unitary, unifying all
of them as well as their interactions. As an outstanding feature, nuclear
forces derive from the neutron orbital structure, based on a proton core and a
shell. This shell constitutes the cohesive element of nuclear structure.


title:
Strangeness in the nucleon: neutrino-nucleon and polarized
  electron-nucleon scattering

abstract:
  After the EMC and subsequent experiments at CERN, SLAC and DESY on the deep
inelastic scattering of polarized leptons on polarized nucleons, it is now
established that the Q^2=0 value of the axial strange form factor of the
nucleon, a quantity which is connected with the spin of the proton and is quite
relevant from the theoretical point of view, is relatively large.
  In this review we consider different methods and observables that allow to
obtain information on the strange axial and vector form factors of the nucleon
at different values of Q^2. These methods are based on the investigation of the
Neutral Current induced effects such as the P-odd asymmetry in the scattering
of polarized electrons on protons and nuclei, the elastic neutrino
(antineutrino) scattering on protons and the quasi-elastic neutrino
(antineutrino) scattering on nuclei. We discuss in details the phenomenology of
these processes and the existing experimental data.


title:
Determination of the String Scale in D-Brane Scenarios and Dark Matter
  Implications

abstract:
  We analyze different phenomenological aspects of D-brane constructions.
First, we obtain that scenarios with the gauge group and particle content of
the supersymmetric standard model lead naturally to intermediate values for the
string scale, in order to reproduce the value of gauge couplings deduced from
experiments. Second, the soft terms, which turn out to be generically non
universal, and Yukawa couplings of these scenarios are studied in detail.
Finally, using these soft terms and the string scale as the initial scale for
their running, we compute the neutralino-nucleon cross section. In particular
we find regions in the parameter space of D-brane scenarios with cross sections
in the range of $10^{-6}$--$10^{-5}$ pb, i.e. where current dark matter
experiments are sensitive. For instance, this can be obtained for $\tan\beta >
5$.


title:
Application and explicit solution of recurrence relations with respect
  to space-time dimension

abstract:
  A short review of the method for the tensor reduction of Feynman integrals
based on recurrence relations with respect to space-time dimension d- is given.
A solution of the difference equation with respect to d for the n - point
one-loop integrals with arbitrary momenta and masses is presented. The result
is written as multiple hypergeometric series depending on ratios of Gram
determinants. For the 3-point function a new expression in terms of the Appell
hypergeometric function F_1 is presented.


title: Projection Operator Approach to Langevin Equations in $\phi^4$ Theory

abstract:
  We apply the projection operator method (POM) to $\phi^4$ theory and derive
both quantum and semiclassical equations of motion for the soft modes. These
equations have no time-convolution integral term, in sharp contrast with other
well-known results obtained using the influence functional method (IFM) and the
closed time path method (CTP). However, except for the fluctuation force field
terms, these equations are similar to the corresponding equations obtained
using IFM with the linear harmonic approximation, which was introduced to
remove the time-convolution integral. The quantum equation of motion in POM can
be regarded as a kind of quantum Langevin equation in which the fluctuation
force field is given in terms of the operators of the hard modes. These
operators are then replaced with c-numbers using a certain procedure to obtain
a semiclassical Langevin equation. It is pointed out that there are significant
differences between the fluctuation force fields introduced in this paper and
those introduced in IFM. The arbitrariness of the definition of the fluctuation
force field in IFM is also discussed.


title: Wandzura-Wilczek-type relations of $\rho$-meson wave functions

abstract:
  We give the geometric Wandzura-Wilczek-type relations between the meson wave
functions of dynamical twist by means of the meson wave functions of geometric
twist. We discuss the difference between geometric and dynamical
Wandzura-Wilczek-type relations. Additionally, the interrelations between the
different twist notations of meson wave functions are discussed.


title: Constructing "Reference" Triangle through Unitarity of CKM Matrix

abstract:
  Motivated by the possibility of the low value of sin2\beta in the
measurements of BABAR and BELLE collaborations, a reference unitarity triangle
is constructed using the unitarity of the CKM matrix and the experimental
values of the well known CKM elements, without involving any inputs from the
processes which might include the new physics effects. The angles of the
triangle are evaluated by finding the CP violating phase \delta through the
Jarlskog's rephasing invariant parameter J. The present data and the unitarity
of the CKM matrix gives for \delta the range 28^o to 152^o, which for sin2\beta
translates to the range 0.21 to 0.88. This range is broadly in agreement with
the recent BABAR and BELLE results. However, a value of sin2\beta \leq 0.2,
advocated by Silva and Wolfenstein as a benchmark for new physics, would imply
a violation in the three generation unitarity and would hint towards the
existence of a fourth generation Further, the future refinements in the CKM
elements will push the lower limit on sin2\beta still higher.


title: How to model Bose-Einstein correlations

abstract:
  We propose new algorithm for numerical modelling of Bose-Einstein
correlations (BEC). It is based on the fact that identical particles subjected
to BEC do, by definition, bunch themselves in a maximal possible way,
restricted only by conservation laws, in the same cells in phase-space.


title:
Neutrino Mass from Laboratory: Contribution of Double Beta Decay to the
  Neutrino Mass Matrix

abstract:
  Double beta decay is indispensable to solve the question of the neutrino mass
matrix together with $\nu$ oscillation experiments. The most sensitive
experiment - since eight years the HEIDELBERG-MOSCOW experiment in Gran-Sasso -
already now, with the experimental limit of $<m_\nu > < 0.26$ eV practically
excludes degenerate $\nu$ mass scenarios allowing neutrinos as hot dark matter
in the universe for the smallangle MSW solution of the solar neutrino problem.
It probes cosmological models including hot dark matter already now on the
level of future satellite experiments MAP and PLANCK. It further probes many
topics of beyond SM physics at the TeV scale. Future experiments should give
access to the multi-TeV range and complement on many ways the search for new
physics at future colliders like LHC and NLC. For neutrino physics some of them
(GENIUS) will allow to test almost all neutrino mass scenarios allowed by the
present neutrino oscillation experiments.


title: GENIUS - A New Facility of Non-Accelerator Particle Physics

abstract:
  The GENIUS (\underline {Ge}rmanium in Liquid \underline {Ni}trogen \underline
{U}nderground \underline {S}etup) project has been proposed in 1997
\cite{KK-BEY97} as first third generation double beta decay project, with a
sensitivity aiming down to a level of an effective neutrino mass of $<m>\sim$
0.01 - 0.001 eV. Such sensitivity has been shown to be indispensable to solve
the question of the structure of the neutrino mass matrix which cannot be
solved by neutrino oscillation experiments alone \cite{KKPS}. It will allow
broad access also to many other topics of physics beyond the Standard Model of
particle physics at the multi-TeV scale. For search of cold dark matter GENIUS
will cover almost the full range of the parameter space of predictions of SUSY
for neutralinos as dark matter \cite{KK-Ram,Bed-KK2}. Finally, GENIUS has the
potential to be the first real-time detector for low-energy (pp and $^7{Be}$)
solar neutrinos \cite{Bau-KK,KKPropos99}. A GENIUS-Test Facility has just been
funded and will come into operation by end of 2001.


title: The Collins function: a simple model calculation

abstract:
  The Collins function belongs to the class of the so-called time-reversal odd
fragmentation functions. Being chiral-odd as well, it can serve as an important
tool to observe the nucleon's transversity distribution in semi-inclusive DIS.
Due to the possible presence of final state interactions, this function can be
non-zero, though this has never been demonstrated in an explicit model
calculation. We use a simple pseudoscalar coupling between pions and quarks to
model the fragmentation process and we show that the inclusion of one-loop
corrections generates a non-vanishing Collins function, therefore giving
support to its existence from the theoretical point of view.


title: A new fit to solar neutrino data in models with large extra dimensions

abstract:
  String inspired models with millimeter scale extra dimensions provide a
natural way to understand an ultralight sterile neutrino needed for a
simultaneous explanation of the solar, atmospheric and LSND neutrino
oscillation results. The sterile neutrino is the bulk neutrino ($\nu_B$)
postulated to exist in these models, and it becomes ultralight in theories that
prevent the appearance of its direct mass terms. Its Kaluza-Klein (KK) states
then add new oscillation channels for the electron neutrino emitted from the
solar core. We show that successive MSW transitions of solar $\nu_e$ to the
lower lying KK modes of $\nu_B$ in conjunction with vacuum oscillations between
the $\nu_e$ and the zero mode of $\nu_B$ provide a new way to fit the solar
neutrino data. Using just the average rates from the three types of solar
experiments, we predict the Super-Kamiokande spectrum with 73\% probability,
but dips characteristic of the 0.06 mm extra dimension should be seen in the
SNO spectrum. We discuss both intermediate and low string scale models where
the desired phenomenology can emerge naturally.


title:
QCD and power corrections to sum rules in deep-inelastic lepton-nucleon
  scattering

abstract:
  In this paper we study QCD and power corrections to sum rules which show up
in deep inelastic lepton-hadron scattering. Furthermore we will make a
distinction between fundamental sum rules which can be derived from quantum
field theory and those which are of a phenomenological origin. Using current
algebra techniques the fundamental sum rules can be expressed into expectation
values of (partially) conserved (axial-) vector currents sandwiched between
hadronic states. These expectation values yield the quantum numbers of the
corresponding hadron which are determined by the underlying flavour group
$SU(n)_F$. In this case one can show that there exist an intimate relation
between the appearance of power and QCD corrections. The above features do not
hold for phenomenological sum rules, hereafter called non-fundamental. They
have no foundation in quantum field theory and they mostly depend on certain
assumptions made for the structure functions like superconvergence relations or
the parton model. Therefore only the fundamental sum rules provide us with a
stringent test of QCD.


title: The Spin Structure of the Nucleon: Theoretical Overview

abstract:
  I review what is known about the quark and gluon spin distributions in the
nucleon. I discuss in some detail (a) the existence of sum rules for angular
momentum; (b) the interpretation and possible measurement of the nucleon's
transversity distributions; and (c) the uses of spin-dependent fragmentation
functions.


title: Buckyballs of QCD: gluon junction networks

abstract:
  We propose that femto scale QCD analogs of Fullerene type excitations may
exist with ``magic numbers'' 8,24,48, and 120. These ``J-balls'' are the most
symmetrical closed networks of gluonic baryon junctions and anti-junctions with
zero net baryon number. CP odd J-Moebii and other femto-tubes and tori gluonic
structures may also exist. We estimate the relative binding energies and
discuss possible experimental signatures of the formation of these new
topological gluonic states.


title:
OMS-bar scheme of UV renormalization in the presence of unstable
  fundamental particles

abstract:
  A generalization of the on-mass-shell scheme of UV renormalization (the
OMS-bar scheme) to the case of presence of unstable fundamental particles (like
W and Z bosons) is proposed. Its basic ingredients are as follows: (i) the
renormalized mass coincides with a real part of the position of the complex
pole of the corresponding propagator, (ii) the imaginary part of the on-shell
self-energy coincides with the imaginary part of the complex pole position. The
latter property implies the gauge-invariance of the imaginary part of the
on-shell self-energy in the OMS-bar scheme and its connection with the lifetime
of an unstable particle. Starting with the three-loops this connection becomes
nontrivial.


title: Gauge-invariant description of W-pair production in NLO approximation

abstract:
  The processes $e^{+}e^{-} \to 4f(\gamma)$ mediated by W-pair (and single)
production are considered in the framework of the modified perturbation theory,
based on the expansion of probability in powers of the coupling constant
instead of amplitude. A full set of one-loop corrections to cross-section, and
two-loop corrections to self-energy of unstable particles are completely taken
into consideration. It is shown that the manifestly non-factorizable
corrections do not make contributions into the next-to-leading-order
approximation. Moreover, the colour reconnection does not make contributions
within this precision, either. The rest of the corrections together with the
leading-order contribution provide the gauge-invariant description of the
processes.


title: QCD and multiplicity scaling

abstract:
  In QCD, the similarity of multiplicity distributions is violated i) by the
running of the strong coupling constant alpha_s and ii) by the self-similar
nature of parton cascades. It will be shown that the data collapsing behavior
of P_n onto a unique scaling curve can be restored by performing the original
scaling prescription (translation and dilatation) in the multiplicity moments'
rank.


title: Supergravity Unification

abstract:
  A review is given of the historical developments of 1982 that lead to the
supergravity unified model (SUGRA)with gravity mediated breaking of
supersymmetry. Further developments and applications of the model in the period
1982-85 are also discussed. The supergravity unified model and its minimal
version (mSUGRA) are currently among the leading candidates for physics beyond
the Standard Model. A brief note on the developments from the present vantage
point is included.


title: Dispersion relations and soft pion theorems for K -> pi pi

abstract:
  We propose a new method to obtain the K -> pi pi amplitude from K -> pi which
allows one to fully account for the effects of final state interactions. The
method is based on a set of dispersion relations for the K -> pi pi amplitude
in which the weak Hamiltonian carries momentum. The soft pion theorem, which
relates this amplitude to the K -> pi amplitude, can be used to determine one
of the two subtraction constants - the second constant is at present known only
to leading order in chiral perturbation theory. We solve the dispersion
relations numerically and express the result in terms of the unknown higher
order corrections to this subtraction constant.


title: Solar neutrino event spectra: Tuning SNO to equalize Super-Kamiokande

abstract:
  The Super-Kamiokande (SK) and the Sudbury Neutrino Observatory (SNO)
experiments are monitoring the flux of B solar neutrinos through the electron
energy spectrum from the reactions nu_{e,mu,tau} + e --> nu_{e,mu,tau} + e and
nu_e + d --> p + p + e, respectively. We show that the SK detector response to
B neutrinos in each bin of the electron energy spectrum (above 8 MeV) can be
approximated, with good accuracy, by the SNO detector response in an
appropriate electron energy range (above 5.1 MeV). For instance, the SK
response in the bin [10,10.5] MeV is reproduced (``equalized'') within 2
percent by the SNO response in the range [7.1,11.75] MeV. As a consequence, in
the presence of active neutrino oscillations, the SK and SNO event rates in the
corresponding energy ranges turn out to be linearly related, for any functional
form of the oscillation probability. Such equalization is not spoiled by the
possible contribution of hep neutrinos (within current phenomenological
limits). In perspective, when the SK and the SNO spectra will both be measured
with high accuracy, the SK-SNO equalization can be used to determine the
absolute B neutrino flux, and to cross-check the (non)observation of spectral
deviations in SK and SNO. At present, as an exercise, we use the equalization
to ``predict'' the SNO energy spectrum, on the basis of the current SK data.
Finally, we briefly discuss some modifications or limitations of our results in
the case of sterile neutrino oscillations and of relatively large Earth matter
effects.


title: A note on the dispersive treatment of K -> pi pi with the kaon off-shell

abstract:
  It has been recently suggested that it is possible to calculate the effect of
final state interactions in K -> pi pi amplitudes by applying dispersive
methods to the amplitude with the kaon off-shell. We critically reexamine the
procedure, and point out the effects of the arbitrariness in the choice of the
off-shell field for the kaon.


title: Strong constraint on large extra dimensions from cosmology

abstract:
  We have studied cosmological constraints on the number and radii of possible
large extra dimensions. If such dimensions exist, Kaluza-Klein (KK) modes are
copiously produced at high temperatures in the early universe, and can
potentially lead to unacceptable cosmological effects. We show that during
reheating, large numbers of KK modes are produced. These modes are not diluted
completely by the entropy production during reheating because they are produced
non-relativistically. This means that the modes produced during reheating can
easily be the dominant component. For instance, for two extra dimensions the
bound on their radii from considering only the thermally produced KK modes is R
< 1.1 x 10^-4 mm. If the modes produced during reheating are also accounted
for, the bound is strengthened to R < 2.2 x 10^-5 mm. This bound is stronger
than all other known astrophysical or laboratory limits.


title:
Impact parameter dependent S-matrix for dipole-proton scattering from
  diffractive meson electroproduction

abstract:
  We extract the S-matrix element for dipole-proton scattering using the data
on diffractive electroproduction of vector mesons at HERA. By considering the
full t dependence of this process we are able to reliably unfold the profile of
the S-matrix for impact parameter values b>0.3 fm. We show that the results
depend only weakly on the choice of the form for the vector meson wave
function. We relate this result to the discussion about possible saturation
effects at HERA.


title: Light Quark Mass Effects in Bottom Quark Mass Determinations

abstract:
  Recent results for charm quark mass effects in perturbative bottom quark mass
determinations from $\Upsilon$ mesons are reviewed. The connection between the
behavior of light quark mass corrections and the infrared sensitivity of some
bottom quark mass definitions is examined in some detail.


title: $V_{cs}$ from Pure Leptonic Decays of $D_s$ with Radiative Corrections

abstract:
  The radiative corrections to the pure leptonic decay $D_s{\longrightarrow}
{\ell}{{\nu}}_{\ell}$ up-to one-loop order is presented. We find the virtual
photon loop corrections to $D_s{\longrightarrow} {\tau}{{\nu}}_{\tau}$ is
negative and the corresponding branching ratio is larger than $3.51\times
10^{-3}$. Considering the possible experimental resolutions, our prediction of
the radiative decay $D_s{\longrightarrow} {\tau}{{\nu}}_{\tau}\gamma$ is not so
large as others, and the best radiative channel to determine the $V_{cs}$ or
$f_{D_s}$ is $D_s{\longrightarrow} {\mu}{{\nu}}_{\mu}{\gamma}$.


title: Status of 3-neutrino and 4-neutrino scenarios

abstract:
  Some aspects of the current neutrino oscillation phenomenology are briefly
discussed, with emphasis on the status of mass-mixing parameters relevant for
scenarios with three active neutrinos, and with an additional fourth sterile
neutrino.


title: Bounds on \sin 2\beta and |V_{ub}/V_{cb}| from the Light-Quark Triangle

abstract:
  With the help of the light-quark triangle, which is essentially congruent to
the rescaled unitarity triangle for a variety of textures of the quark mass
matrices, we calculate the CP-violating quantity \sin 2\beta and the ratio of
|V_{ub}| to |V_{cb}|. We find that \sin 2\beta is most likely to lie in the
range 0.45 \leq \sin 2\beta \leq 0.60, a result compatible very well with the
present BaBar and Belle measurements. On the other hand, |V_{ub}/V_{cb}| \geq
0.8 is disfavored. Our bounds on both \sin 2\beta and |V_{ub}/V_{cb}| can soon
be confronted with more precise data to be accumulated from the asymmetric
B-meson factories.


title: Twist-3 in Proton Nucleon Single Spin Asymmetries

abstract:
  These proceedings contain the 'physical' derivation of the Wandzura-Wilczek
relations for the spin-dependent structure function g2 (amounting to keeping
the intrinsic transverse momentum of quarks, and neglecting the physical
transverse components of the gluon fields), recently generalized for the case
of non-forward processes (hep-ph/0102209). The simple numerical model for the
twist-3 contribution to g2 was also suggested.


title:
Can the Higgs sector contribute significantly to the muon anomalous
  magnetic moment?

abstract:
  A light CP-even Higgs boson (h) with a mass of about 10 GeV could explain the
recent BNL measurement of the muon anomalous magnetic moment, in the framework
of a general CP-conserving two-Higgs-doublet extension of the Standard Model
with no tree-level flavor-changing neutral Higgs couplings. However, the
allowed Higgs mass window is quite small and the corresponding model parameters
are very constrained. The Higgs sector can contribute significantly to the
observed BNL result for g-2 without violating known experimental constraints
only if the hZZ coupling (approximately) vanishes and m_h lies between the
Upsilon mass and 2m_B.


title: Introduction to "The Supersymmetric World: The Beginnings of The Theory"

abstract:
  This is the foreword to the book we edited on the origins and early
development of supersymmetry, which has been just issued by World Scientific.
This book presents a view on the discovery of supersymmetry and pioneering
investigations before summer 1976, mainly in the words of people who
participated. It combines anecdotal descriptions and personal reminiscences
with more technical summaries of the trailblazers, covering the birth of the
theory and its first years -- origin of the idea, four-dimensional field theory
realization, and supergravity. The eyewitnesses convey to us the drama of one
of the deepest discoveries in theoretical physics in the 20-th century.
Contributors: V. Akulov, R. Di Stefano, P. Fayet, S. Ferrara, G.-L. Gervais, N.
Koretz-Golfand, E. Likhtman, M. Marinov, A. Neveu, L. O'Raifeartaigh, P.
Ramond, B. Sakita, J. Schwarz, M. Sohnius, V. Soroka, J. Strathdee, D. Volkov,
J. Wess, P. West.


title:
Subleading Isgur-Wise form factors and O(1/m_Q) corrections to the
  semileptonic decays B->D_1 l\bar\nu and B->D_2^* l\bar\nu

abstract:
  Exclusive semileptonic decays B->D_1(2420)l\bar\nu and B->D_2^*(2460)l\bar\nu
are studied at the subleading order of the heavy quark expansion. The
subleading Isgur-Wise functions resulted from the kinetic energy and
chromomagnetic corrections to the HQET Lagrangian are calculated by QCD sum
rules in the framework of the heavy quark effective theory. The decay rates and
branching ratios are computed with the inclusion of the order of 1/m_Q
corrections. It is found that the 1/m_Q correction to the decay rate is not
large for B->D^*_2 but is very large for B->D_1.


title:
Dispersion Relations and Sum Rules for the pi ->gamma gamma* and gamma*
  ->gamma pi form factor

abstract:
  Sum rules for the off-shell isovector form factor pi -> gamma gamma* are
given in terms of the pion form factor and the gamma pi ->pi pi experimental
data. Similarly the corresponding sum rules for the isoscalar form factor are
given in terms of the experimental photon-3 pi form factor and the gamma pi ->
3 pi amplitude. For some set of parameters, e.g. rho -> pi gamma width = 90
KeV, the pi -> gamma gamma rate and the slope parameter of the decay pi ->
gamma e plus e minus are in good agreement with the experimental data.


title: SU(5) Grand Unification in Extra Dimensions and Proton Decay

abstract:
  We analyse proton decay in the context of simple supersymmetric SU(5) grand
unified models with an extra compact spatial dimension described by the
orbifold S^1/(Z_2 x Z_2'). Gauge and Higgs degrees of freedom live in the bulk,
while matter fields can only live at the fixed point branes. We present an
extended discussion of matter interactions on the brane. We show that proton
decay is naturally suppressed or even forbidden by suitable implementations of
the parity symmetries on the brane. The corresponding mechanism does not affect
the SU(5) description of fermion masses also including the neutrino sector,
where Majorana mass terms remain allowed.


title:
Two photon decay of the pseudoscalars, the chiral symmetry breaking
  corrections

abstract:
  The extrapolation of the decay amplitudes of the pseudoscalar mesons into two
photons from the soft meson limit where it is obtained from the axial-anomaly
to the mass shell involves the contribution of the 0^ - continuum. These chiral
symmetry breaking corrections turn out to be large. The effects of these
corrections on the calculated pi ^0 decay rate, on the values of the
singlet-octet mixing angle and on the ratios f_8 / f_pi and f_0 / f_pi are
discussed. The implications for the transition form factors gamma gamma* -->
pseudoscalars are also evaluated and confronted with the available experimental
data.


title: Crossing and Radon Tomography for Generalized Parton Distributions

abstract:
  The crossing properties of the matrix elements of non-local operators,
parameterized by Generalized Parton Distribution, are considered. They are
especially simple in terms of the Double Distributions which are common for the
various kinematical regions. As a result, Double Distributions may be in
principle extracted from the combined data in these regions by making use of
the inverse Radon transform, known as a standard method in tomography. The
ambiguities analogous to the ones for the vetor potential in the
two-dimensional magneto-statics are outlined. The possible generalizations are
discussed.


title:
Nearly Bi-Maximal Neutrino Mixing, Muon g-2 Anomaly and
  Lepton-Flavor-Violating Processes

abstract:
  We interpret the newly observed muon g-2 anomaly in the framework of a
leptonic Higgs doublet model with nearly degenerate neutrino masses and nearly
bi-maximal neutrino mixing. Useful constraints are obtained on the rates of
lepton-flavor-violating rare decays $\tau \to \mu \gamma$, $\mu \to e \gamma$
and $\tau \to e \gamma$ as well as the $\mu$-$e$ conversion ratio $R_{\mu e}$.
We find that $\Gamma (\mu \to e \gamma)$, $\Gamma (\tau \to e \gamma)$ and
$R_{\mu e}$ depend crucially on possible non-zero but samll values of the
neutrino mixing matrix element $V_{e3}$, and they are also sensitive to the
Dirac-type CP-violating phase. In particular, we show that $\Gamma (\tau \to
\mu \gamma)/m^5_\tau$, $\Gamma (\mu \to e \gamma)/m^5_\mu$ and $\Gamma (\tau
\to e \gamma)/m^5_\tau$ are approximately in the ratio $1: 2|V_{e3}|^2:
2|V_{e3}|^2$ if $|V_{e3}|$ is much larger than ${\cal O}(10^{-2})$, and in the
ratio $2 (\Delta m^2_{\rm atm})^2: (\Delta m^2_{\rm sun})^2:(\Delta m^2_{\rm
sun})^2$ if $|V_{e3}|$ is much lower than ${\cal O}(10^{-3})$, where $\Delta
m^2_{\rm atm}$ and $\Delta m^2_{\rm sun}$ are the corresponding mass-squared
differences of atmospheric and solar neutrino oscillations.


title:
The Mesonic Fluctuations and Corrections in the Chiral Symmetry Breaking
  Vacuum

abstract:
  The mesonic quantum fluctuations and their corrections on the chiral
condensate and pion polarization function are investigated in the
self-consistent scheme of SU(2) Nambu-Jona-Lasinio model by exactly calculating
the next-to-leading order (NLO) Feynman diagrams in $1/N_c$ expansion. While
the fluctuations and corrections depend strongly on the meson's three-momentum
cut-off $\Lambda_M$, no chiral symmetry restoration is found since the
cancellation between the NLO and the one-quark-loop diagram with quark mass
deviated from the mean-field value.


title:
Precision prediction of gauge couplings and the profile of a string
  theory

abstract:
  We estimate the significance of the prediction for the gauge couplings in the
MSSM with an underlying unification. The correlation between the couplings
covers only (0.2-2)% of the a priori reasonable region of the parameter space,
while the prediction for $\sin ^{2}\theta_{W}$ is accurate to 1.3%. Given that
agreement with experiment to such precision is unlikely to be fortuitous, we
discuss the profile of a string theory capable of preserving this level of
accuracy. We argue that models with a low scale of unification involving power
law running in the gauge couplings do not. Even theories with a high scale of
unification are strongly constrained, requiring the compactification scale of
new space dimensions in which states transforming under the Standard Model
propagate to be very close to the string cut-off scale. As a result {\it no}
new space dimensions can be larger than $10^{-14}fm.$