title: Spin structure in non-forward partons

abstract:
  Renormalisation induces anomalous contributions in light-cone correlation
functions. We discuss the role of the axial anomaly and gluon topology in
non-forward parton distributions noting that non-forward matrix elements of the
gluonic Chern-Simons current K_{\mu} are not gauge-invariant even in
perturbation theory. The axial anomaly means that one has to be careful how to
interpret information from hard exclusive reactions about the orbital
angular-momentum carried by the proton's internal constituents.


title: Top-quark rare decay $t\to c h$ in R-parity-violating SUSY

abstract:
  The flavor-changing top-quark decay $t\to c h$, where $h$ is the lightest
CP-even Higgs boson in the minimal supersymmetric standard model, is examined
in the R-parity-violating supersymmetric model. Within the existing bounds on
the relevant R-parity-violating couplings, the branching fraction for $t\to c
h$ can be as large as about $10^{-5}$ in some part of the parameter space.


title:
Transverse energy distributions and $J/\psi$ production in Pb+Pb
  collisions

abstract:
  We have analyzed the latest NA50 data on transverse energy distributions and
$J/\psi$ suppression in Pb+Pb collisions. The transverse energy distribution
was analysed in the geometric model of AA collisions. In the geometric model,
fluctuations in the number of NN collisions at fixed impact parameter are taken
into account. Analysis suggests that in Pb+Pb collisions, individual NN
collisions produces less $<E_T>$, than in other AA collisions. The nucleons are
more transparent in Pb+Pb collisions. The transverse energy dependence of the
$J/\psi$ suppression was obtained following the model of Blaizot et al, where
charmonium suppression is assumed to be 100% effective above a threshold
density. With fluctuations in number of NN collisions taken into account, good
fit to the data is obtained, with a single parameter, the threshold density.


title: Two-Pion Decay Widths of Excited Charm Mesons

abstract:
  The widths for $\pi\pi$ decay of the L=1 charm mesons are calculated by
describing the pion coupling to light constituents quarks by the lowest order
chiral interaction. The wavefunctions of the charm mesons are obtained as
solutions to the covariant Blankenbecler-Sugar equation. These solutions
correspond to an interaction Hamiltonian modeled as the sum of a linear scalar
confining and a screened one-gluon exchange (OGE) interaction. This interaction
induces a two-quark contribution to the amplitude for two-pion decay, which is
found to interfere destructively with the single quark amplitude. For the
currently known L=1 $D$ mesons, the total $\pi\pi$ decay widths are found to be
$\sim 1$ MeV for the $D_1(2420)$ and $\sim 3$ MeV for the $D^*_2(2460)$ if the
axial coupling of the constituent quark is taken to be $g_A^q=1$. The as yet
undiscovered spin singlet $D_1^*$ state is predicted to have a larger width of
7 - 10 MeV for $\pi\pi$ decay.


title: Electroweak baryogenesis and hierarchy

abstract:
  We consider the scenario of electroweak baryogenesis mediated by cosmological
defects in a model of extra dimension. We consider the domain wall on the brane
in higher-dimensional theories.The electroweak breaking scale is suppressed and
the sphaleron interaction is activated in the false vacuum.


title: CP Asymmetry of $B\to X_sl^+l^-$ in Low Invariant Mass Region

abstract:
  I analyzed the CP asymmetry of $B\to X_sl^+l^-$ based on model-independent
analysis which includes twelve independent four Fermi operators. The CP
asymmetry is suppressed in the Standard Model, however, if some new physics
make it much larger, the present or the next generation B factories may catch
the CP violation in this decay mode. In this paper, we studied the correlation
of the asymmetry and the branching ratio, and then we will find only a type of
interactions can be enlarge the asymmetry. Therefore, in comparison with
experiments, we have possibility that we can constrain models beyond the
standard model.


title: A Compilation of High Energy Atmospheric Muon Data at Sea Level

abstract:
  We collect and combine all published data on the vertical atmospheric muon
flux and the muon charge ratio for muon momenta above 10 GeV. At sea level the
world average of the momentum spectra agrees with the flux calculated by E.V.
Bugaev et al. within 15%. The observed shape of the differential flux versus
momentum is slightly flatter than predicted in this calculation. The
experimental accuracy varies from 7% at 10 GeV to 17% at 1 TeV. The ratio of
fluxes of positive to negative muons is found to be constant, at a value of
1.268, with relative uncertainties increasing from approximately 1% at low
momenta to about 6% at 300 GeV.


title: Electroweak Baryogenesis in Supersymmetric Variants

abstract:
  We argue that the creation of a baryon asymmetry in the early universe is an
intriguing case where several aspects of ``Beyond'' physics are needed. We then
concentrate on baryogenesis in a strong first-order phase transition and
discuss that supersymmetric variants of the electroweak theory (MSSM and some
version of NMSSM) rather naturally provide the necessary ingredients. The
charginos and the stops play a prominent role. We present CP-violating
dispersion relations in the chargino sector and show results of a concrete
model calculation for the asymmetry production based on quasi-classical
Boltzmann transport equations and sphaleron transitions in the hot electroweak
phase.


title: Connection between Chiral Symmetry Restoration and Deconfinement

abstract:
  We propose a simple explanation for the connection between chiral symmetry
restoration and deconfinement in QCD at high temperature. In the Higgs
description of the QCD vacuum both spontaneous chiral symmetry breaking and
effective gluon masses are generated by the condensate of a color octet
quark-antiquark pair. The transition to the high temperature state proceeds by
the melting of this condensate. Quarks and gluons become (approximately)
massless at the same critical temperature. For instanton-dominated effective
multiquark interactions and three light quarks with equal mass we find a first
order phase transition at a critical temperature around 170 MeV.


title: The fate of the B ball

abstract:
  The gauge-mediated SUSY-breaking (GMSB) model needs entropy production at a
relatively low temperature in the thermal history of the Universe for the
unwanted relics to be diluted. This requires a mechanism for the baryogenesis
after the entropy production, and the Affleck and Dine (AD) mechanism is a
promising candidate for it. The AD baryogenesis in the GMSB model predicts the
existence of the baryonic Q ball, that is the B ball, and this may work as the
dark matter in the Universe. In this article, we discuss the stability of the B
ball in th presence of baryon-number violating interactions. We find that the
evaporation rate increases monotonically with the B-ball charge because the
large field value inside the B ball enhances the effect of the
baryon-number-violating operators. While there are some difficulties to
evaluate the evaporation rate of the B ball, we derive the evaporation time
(lifetime) of the B ball for the mass-to-charge ratio $\omega_0\gsim 100 \MEV$.
The lifetime of the B ball and the distortion of the cosmic ray positron flux
and the cosmic background radiation from the B ball evaporation give
constraints on the baryon number of the B ball and the interaction, if the B
ball is the dark matter. We also discuss some unresolved properties of the B
ball.


title: CP violation effects and high energy neutrinos

abstract:
  This work discusses critically the prospects of measuring CP and T violation
effects in high energy neutrino factories. For this purpose we develop, in the
standard framework with three neutrino flavors, simple expressions for the
oscillation probabilities in matter that are valid for high E_nu. All CP
violating effects vanish as E_nu^(-3) and are very difficult to detect with
high energy neutrinos. A significantly easier task is the determination of the
absolute value |delta| of the phase in the neutrino mixing matrix that controls
the CP and T violation effects, performing precision measurements of the CP and
T conserving part of the oscillation probabilities.


title: Color superconducting quark matter

abstract:
  I review recent progress in our understanding of the color superconducting
phase of matter above nuclear density, giving particular emphasis to the effort
to find observable signatures of the presence of this phase in compact stars.


title: Quantum Field Theory of boson mixing

abstract:
  We consider the quantum field theoretical formulation of boson field mixing
and obtain the exact oscillation formula. This formula does not depend on
arbitrary mass parameters. We show that the space for the mixed field states is
unitarily inequivalent to the state space where the unmixed field operators are
defined. We also study the structure of the currents and charges for the mixed
fields.


title: Cosmological Constraints in SUSY with Yukawa Unification

abstract:
  The cosmological relic density of the lightest supersymmetric particle of the
minimal supersymmetric standard model is calculated under the assumption of
gauge and Yukawa coupling unification. We employ radiative electroweak breaking
with universal boundary conditions from gravity-mediated supersymmetry
breaking. Further constraints are imposed by the experimental bounds on the
b-quark mass and the BR(b -> s gamma). We find that coannihilation of the
lightest supersymmetric particle, which turns out to be an almost pure bino,
with the next-to-lightest supersymmetric particle (the lightest stau) is
crucial for reducing its relic density to an acceptable level.


title: One-Loop Electron Vertex in Yennie Gauge

abstract:
  We derive a compact Yennie gauge representation for the off-shell one-loop
electron-photon vertex, and discuss it properties. This expression is
explicitly infrared finite, and it has proved to be extremely useful in
multiloop calculations in the QED bound state problem.


title: Hadronic Light-Front Wavefunctions and QCD Phenomenology

abstract:
  A fundamental goal in QCD is to understand the non-perturbative structure of
hadrons at the amplitude level--not just the single-particle flavor, momentum,
and helicity distributions of the quark constituents, but also the multi-quark,
gluonic, and hidden-color correlations intrinsic to hadronic and nuclear
wavefunctions. A natural calculus for describing the bound-state structure of
relativistic composite systems in quantum field theory is the light-front Fock
expansion which encodes the properties of a hadrons in terms of a set of
frame-independent n-particle wavefunctions. Light-front quantization in the
doubly-transverse light-cone gauge has a number of remarkable advantages,
including explicit unitarity, a physical Fock expansion, the absence of ghost
degrees of freedom, and the decoupling properties needed to prove factorization
theorems in high momentum transfer inclusive and exclusive reactions. A number
of applications are discussed in these lectures, including semileptonic B
decays, two-photon exclusive reactions, and deeply virtual Compton scattering.
The relation of the intrinsic sea to the light-front wavefunctions is
discussed. A new type of jet production reaction, "self-resolving diffractive
interactions" can provide direct information on the light-front wavefunctions
of hadrons in terms of their quark and gluon degrees of freedom as well as the
composition of nuclei in terms of their nucleon and mesonic degrees of freedom.


title: Lepton Flavor Violating Era of Neutrino Physics

abstract:
  The physics agenda for future long-baseline neutrino oscillation experiments
is outlined and the prospects for accomplishing those goals at future neutrino
facilities are considered. Neutrino factories can deliver better reach in the
mixing and mass-squared parameters but conventional super-beams with large
water or liquid argon detectors can probe regions of the parameter space that
could prove to be interesting.


title: Nucleon Structure and Parity-Violating Electron Scattering

abstract:
  We review the area of strange quark contributions to nucleon structure. In
particular, we focus on current models of strange quark vector currents in the
nucleon and the associated parity-violating elastic electron scattering
experiments from which vector- and axial-vector currents are extracted


title: Nucleons in the Covariant Quark-Diquark Model

abstract:
  We introduce diquarks as separable correlations in the two-quark Green's
function to facilitate the description of baryons as relativistic three-quark
bound states. These states then emerge as solutions of Bethe-Salpeter equations
for quarks and diquarks that interact via quark exchange. Approximating quark
and diquark propagators by the corresponding free ones, we calculate nucleon
static properties and form factors. For the description of production processes
off the nucleon, we consider various dressing functions for the propagators to
remove unphysical thresholds. Results for kaon photoproduction, $\gamma p\to
K\Lambda$, and associated strangeness production, $pp\to pK\Lambda$, allow us
to draw conclusions on the permissibility of different dressing functions.


title:
Matter Mass Generation and Theta Vacuum: Dynamical Spontaneous Symmetry
  Breaking

abstract:
  This work proposes a stringent concept of matter mass generation and Theta
vacuum in the context of local gauge theory for the strong force under the
constraint of the flat universe. The matter mass is generated as the
consequence of dynamical spontaneous symmetry breaking (DSSB) of gauge symmetry
and discrete symmetries, which is motivated by the parameter Theta representing
the surface term. Matter mass generation introduces the typical features of
constituent particle mass, dual Meissner effect, and hyperfine structure. The
Theta term plays important roles on the DSSB of the gauge group and on the
quantization of the matter and vacuum space. The Theta vacuum exhibits the
intrinsic principal number and intrinsic angular momentum for intrinsic space
quantization in analogy with the extrinsic principal number and extrinsic
angular momentum for extrinsic space quantization.


title: Fundamental Forces as Gauge Theories

abstract:
  This study proposes that all the known fundamental forces including gravity
may be described by local gauge theories. Gravitational, electroweak, and
strong interactions on length scales from 10^{-33} cm to 10^{28} cm are
systematically discussed from the unified gauge theory point of view toward a
ultimate theory for fundamental forces. New concepts such as dynamical
spontaneous symmetry breaking, gauge group hierarchy, coupling constant
hierarchy, effective coupling constant hierarchy, cosmological constant,
massive gauge bosons, massless gauge bosons, quantum weakdynamics, analogy
between quantum weakdynamics and quantum chromodynamics, a possible gauge
theory for the universe expansion, the relation between time and gauge boson
mass, other quantum tests, etc. are briefly reported based on experiments.


title: Fundamental Constants and Conservation Laws

abstract:
  This work describes underlying features of the universe such as fundamental
constants and cosmological parameters, conservation laws, baryon and lepton
asymmetries, etc. in the context of local gauge theories for fundamental forces
under the constraint of the flat universe. Conservation laws for fundamental
forces are related to gauge theories for fundamental forces, their resulting
fundamental constants are quantitatively analyzed, and their possible
violations at different energy scales are proposed based on experimental
evidences.


title: Higgs and SUSY Higgs bosons at future linear collider

abstract:
  Theoretical overview on phenomenology of Higgs boson and SUSY Higgs boson at
a future linear collider experiment is given as a Higgs and SUSY Higgs working
group summary report for LCWS 2000.


title: Embed Zee Neutrino Mass Model into SUSY

abstract:
  In this talk, I summarize a work done in collaboration with Otto Kong on the
Zee neutrino mass model. We show that the MSSM with explicit R-parity violation
actually contains the Zee model with the right-handed sleptons as the Zee
singlet. We determine the conditions on the parameter space such that the
neutrino mass matrix provides a viable texture that explains the atmospheric
and solar data.


title: Phenomenology of Neutrino Mass Matrix

abstract:
  The search for possible mixing patterns of charged leptons and neutrinos is
important to get clues of the origin of nearly maximal mixings, since there are
some preferred bases of the lepton mass matrices given by underlying theories.
We systematically examine the mixing patterns which could lead to large lepton
mixing angles. We find out 37 mixing patterns are consistent with experimental
data if taking into account phase factors in the mixing matrices. Only 6
patterns of them can explain the observed data without any tuning of
parameters, while the others need particular choices for phase values.


title: B --> K l^+ l^- decay in the general two Higgs doublet model

abstract:
  We study the branching ratio, CP-violating asymmetry, forward-backward
asymmetry and the CP-violating asymmetry in the forward-backward asymmetry for
the exclusive decay B--> K l^+ l^-$ in the two Higgs doublet model with tree
level flavor changing neutral currents (model III). We analyse the dependencies
of these quantities on the neutral Higgs boson contributions and the CP
parameter sin\theta in the model III. We observe that to determine the neutral
Higgs boson effects, the measurements of the forward-backward asymmetry and the
CP-violating asymmetry in the forward-backward asymmetry for the decay B--> K
l^+ l^- are promising.


title: QCD sum rules for rho mesons in nuclear matter

abstract:
  We investigate QCD sum rules for vector currents in the rho meson channel in
the nuclear medium. For increased sensitivity, we subtract out the vacuum
contributions. With a saturation scheme often considered in the literature, we
find these subtracted sum rules to be unstable. It indicates the importance of
other contributions neglected in the saturation scheme. These include more
Landau singularities at low energy, additional operators in the medium, and
possibly the in-medium width of the rho meson.


title: Can three-flavor oscillations solve the solar neutrino problem?

abstract:
  The most promising solution to the solar neutrino problem are neutrino
oscillations, which usually are analyzed within the reduced 2-flavor scheme,
because the solutions found therein reasonably well reproduce the recent data
of Super-Kamiokande about the recoil-electron energy spectrum, zenith-angle and
seasonal variations, and the event rate data of all the neutrino detectors. In
this work, however, a survey of the complete parameter space of 3-flavor
oscillations is performed. Basically eight new additional solutions could be
identified, where the best one with \Delta m(12)^2=2.7x10^(-10) eV^2, \Delta
m(13)^2=1.0x10^(-5) eV^2, \Theta(12)=23, and \Theta(13)=1.3 (denoted SVO) is
slightly more probable than any 2-flavor solution. However, including the
results of the atmospheric neutrino problem excludes all 3-flavour solutions
apart from the SLMA-solution (\Delta m(12)^2=7.9x10^(-6) eV^2, \Delta
m(13)^2=2.5x10^(-4) eV^2, \Theta(12)=1.4, and \Theta(13)=20). Besides, the
ability of SNO and Borexino to discriminate the various 2- and 3-flavor
solutions is investigated. Only with very good statistics in these experiments
the correct solution to the solar neutrino problem can be identified
unambiguously.


title: Random matrix study of the phase structure of QCD with two colors

abstract:
  We apply a random matrix model to the study of the phase diagram of QCD with
two colors, two flavors, and a small quark mass. Although the effects of
temperature are only included schematically, this model reproduces most of the
ground state predictions of chiral perturbation theory and also gives a
qualitative picture of the phase diagram at all temperatures. It leads,
however, to an unphysical behavior of the chiral order parameter and the baryon
density in vacuum and does not support diquark condensation at arbitrarily high
densities. A better treatment of temperature dependence leads to correct vacuum
and small temperature properties. We compare our results at both high and low
densities with the results of microscopic calculations using the
Nambu-Jona-Lasinio model and discuss the effects of large momentum scales on
the variations of condensation fields with chemical potential.


title:
TeV Strings and the Neutrino-Nucleon Cross Section at Ultra-high
  Energies

abstract:
  In scenarios with the fundamental unification scale at the TeV one expects
string excitations of the standard model fields at accessible energies. We
study the neutrino-nucleon cross section in these models. We show that duality
of the scattering amplitude forces the existence of a tower of massive
leptoquarks that mediate the process in the s-channel. Using the narrow-width
approximation we find a sum rule for the production rate of resonances with
different spin at each mass level. We show that these contributions can
increase substantially the standard model neutrino-nucleon cross section,
although seem insufficient in order to explain the cosmic ray events above the
GZK cutoff energy.


title: Aspects of near threshold neutral pion photoproduction off protons

abstract:
  We investigate near threshold neutral pion photoproduction off protons to
fourth order in heavy baryon chiral perturbation theory in the light of the new
data from MAMI. We show that the unitarity cusp at the secondary \pi^+ n
threshold is in agreement with expectations from the final state theorem. We
also analyze the fourth order corrections to the P-wave low-energy theorems and
show that potentially large Delta-isobar contributions are cancelled by
sizeable pion loop effects. This solidifies the parameter free third order
predictions, which are in excellent agreement with the data.


title:
The origins of quark-hadron duality: How does the square of the sum
  become the sum of the squares?

abstract:
  Bloom-Gilman duality demonstrates empirically that the electroproduction of
$N^*$'s at low momentum transfers averages smoothly around the scaling curve
measured at large momentum transfers. The latter is proportional to the sum of
the squares of the constituent charges whereas the former involves the coherent
excitation of resonances and is driven by the square of summed constituent
charges. We determine the minimal necessary conditions for this equality to be
realised so that duality can occur and consider the implications for a range of
processes that may be studied soon at CEBAF.


title: Phenomenological Issues in the Determination of Delta Gamma_D

abstract:
  We consider the issue of determining the D0-Dbar0 width difference Delta
Gamma_D experimentally. The current situation is reviewed and suggestions for
further study are given. We propose a number of D0 decay modes in addition to
those studied in the recent E791, FOCUS and BELLE lifetime determination
experiments. Then we address prospects for determining CF - CDS strong phase
differences, like delta_{K pi} which appears in the CLEO study of D0 -> K+ pi-
transitions. We show how to extract delta_{K* pi} with CDS data and furthermore
show when D -> K_L pi data becomes available, that delta_{K pi} can also be
obtained.


title: The Description of $F_2$ at Very High Parton Densities

abstract:
  The behavior of the structure function at high energies (high densities) is
directly associated to the gluon distribution. In this paper we analyze the
asymptotic behavior of the structure function at very high densities
considering a leading and a higher twist relation between these two quantities.
We verify that (a) if the leading twist relation between the structure function
and the gluon distribution is used, we recover the black disc limit, and (b) a
softer behavior is predicted if a higher twist relation between $F_2$ and $xG$
is considered. While the first behavior is well-established by the current high
density approaches, the higher twist behavior is a new result. In both cases,
the $F_2$ structure function unitarizes and the Froissart boundary is not
violated in the asymptotic regime of high density QCD.


title: Weak decays to final states with Radial Excitation Admixtures

abstract:
  We consider the weak decays of a B meson to final states that are mixtures of
S-wave radially excited components. We consider non leptonic decays of the type
$B \to \rho' \pi/B \to \rho \pi$, $B \to \omega' \pi/B \to \omega \pi$ and $B
\to \phi' \pi/B \to \phi \pi$ where $\rho'$, $\omega'$ and $\phi'$ are higher
$\rho$, $\omega$ and $\phi$ resonances. We find such decays to have larger or
similar branching ratios compared to decays where the final state $\rho$,
$\omega$ and $\phi$ are in the ground state. We also study the effect of radial
mixing in the vector and the pseudoscalar systems generated from hyperfine
interaction and the annihilation term. We find the effects of radial mixing to
be small and generally negligible for all practical purposes in the vector
system. However, in the $\eta-\eta^{\prime}$ system the effects of radial
mixing are appreciable and seriously affect decay branching ratios for $B \to
\eta(\eta')K(K^*)$. In particular we find that nonstandard $\eta(\eta')$ mixing
can resolve the puzzles in $B \to \eta(\eta')K$ decays.


title: Sudakov suppression in azimuthal spin asymmetries

abstract:
  It is shown that transverse momentum dependent azimuthal spin asymmetries
suffer from suppression due to Sudakov factors, in the region where the
transverse momentum is much smaller than the large energy scale Q^2. The size
and Q^2 dependence of this suppression are studied numerically for two such
asymmetries, both arising due to the Collins effect. General features are
discussed of how the fall-off with Q^2 is affected by the nonperturbative
Sudakov factor and by the transverse momentum weights and angular dependences
that appear in different asymmetries. For a subset of asymmetries the
asymptotic Q^2 behavior is calculated analytically, providing an upper bound
for the decrease with energy of other asymmetries. The effect of Sudakov
factors on the transverse momentum distributions is found to be very
significant already at present-day collider energies. Therefore, it is
essential to take into account Sudakov factors in transverse momentum dependent
azimuthal spin asymmetries.


title: QCD corrections to FCNC single top production at HERA

abstract:
  We calculate first-order QCD corrections to the cross section for single top
quark production mediated by flavor changing neutral currents (FCNC) in ep
collisions at the HERA collider. We find that the uncertainty due to the choice
of the QCD scale is significantly reduced. This study is motivated by the
current experimental work for limits on the FCNC single top cross section.


title: On the Scale of Visible Jets in High Energy Electron-Positron Collisions

abstract:
  A study of the dynamical fluctuation property of jets is carried out using
the Monte Carlo method. The results suggest that, the anisotropy of dynamical
fluctuations in the hadronic system inside jets, changes abruptly with the
variation of the cut parameter y_cut. A transition point exists, where these
fluctuations behave like those in soft hadronic collisions, i.e. being circular
in the transverse plane with respect to dynamical fluctuations.


title:
Measurement of the Inclusive Jet Cross Section in ${\bar p p}$
  collisions at $\sqrt{s}=1.8$ TeV

abstract:
  We present results from the measurement of the inclusive jet cross section
for jet transverse energies from 40 to 465 GeV in the pseudo-rapidity range
$0.1<|\eta|<0.7$. The results are based on 87 $pb^{-1}$ of data collected by
the CDF collaboration at the Fermilab Tevatron Collider. The data are
consistent with previously published results. The data are also consistent with
QCD predictions given the flexibility allowed from current knowledge of the
proton parton distributions. We develop a new procedure for ranking the
agreement of the parton distributions with data and find that the data are best
described by QCD predictions using the parton distribution functions which have
a large gluon contribution at high $E_T$ (CTEQ4HJ).


title: The Role of Wino Content in Neutralino Dark Matter

abstract:
  We investigate the dark matter prospects of supersymmetric models with
nonuniversal gaugino masses. We find that for very particular values of the
ratio of soft supersymmetry-breaking gaugino masses, M2/M1, an enhanced
coannihilation efficiency between the lightest chargino and the lightest
neutralino occurs, allowing for scalars with masses well above the normally
accepted limits for viable dark matter in the universal case. As a specific
example, we investigate models of hidden sector gaugino condensation. These
models exhibit high scalar masses, previously thought dangerous, and the
requisite freedom in the ratio of gaugino masses. The cosmologically viable
regions of parameter space are investigated, allowing very specific statements
to be made about the content of the supersymmetry-breaking hidden sector.


title: Solar neutrino oscillations in the quasi-vacuum regime

abstract:
  Motivated by recent experimental data, we study solar neutrino oscillations
in the range 10^-10 < delta m^2/E < 10^-7 eV^2/MeV. In this range vacuum
oscillations become increasingly affected by (solar and terrestrial) matter
effects for increasing delta m^2, smoothly reaching the MSW regime. A numerical
study of matter effects in such "quasi-vacuum" regime is performed. The results
are applied to the analysis of the recent solar neutrino phenomenology.


title:
Infrared Divergence and Twist-3 Distribution Amplitudes in QCD
  Factorization For $B \to PP$

abstract:
  Since b quark mass is not asymptotically large, chirally enhanced corrections
which arise from twist-3 wave functions may be important in B decays. We thus
evaluate the hadronic matrix elements with the final light pseudoscalar mesons
described by leading twist and twist-3 distribution amplitudes. We find that
chirally enhanced corrections can be included consistently in the framework of
QCD factorization only if the twist-3 distribution amplitudes are symmetric. We
then give explicit expressions of $a_i^p$ for $B \to \pi\pi$ at the
next-to-leading order of $\alpha_s$ including chirally enhanced corrections. We
also briefly discuss the divergence appeared in the hard spectator
contributions.


title: Measuring Atmospheric Neutrino Oscillations with Neutrino Telescopes

abstract:
  Neutrino telescopes with large detection volumes can demonstrate that the
current indications of neutrino oscillation are correct or if a better
description can be achieved with non-standard alternatives. Observations of
contained muons produced by atmospheric neutrinos can better constrain the
allowed region for oscillations or determine the relevant parameters of
non-standard models. We analyze the possibility of neutrino telescopes
measuring atmospheric neutrino oscillations. We suggest adjustments to improve
this potential. An addition of four densely-instrumented strings to the AMANDA
II detector makes observations feasible. Such a configuration is competitive
with current and proposed experiments.


title: Breaking democracy with non renormalizable mass terms

abstract:
  The exact democratic structure for the quark mass matrix, resulting from the
action of the family symmetry group $A_{3L}\times A_{3R}$, is broken by the
vaccum expectation values of heavy singlet fields appearing in non
renormalizable dimension 6 operators. Within this specific context of breaking
of the family symmetry we formulate a very simple ansatz which leads to correct
quark masses and mixings.


title: Bose Einstein condensation at reheating

abstract:
  We discuss the possibility that a perturbative reheating stage after
inflation produces a scalar particle gas in a Bose condensate state,
emphasizing the possible cosmological role of this phenomenon for symmetry
restoration.


title:
Neutral MSSM Higgs-boson production at e+e- colliders in the
  Feynman-diagrammatic approach

abstract:
  We calculate the cross sections for the neutral Higgs-boson production at
e+e- colliders in the Minimal Supersymmetric Standard Model (MSSM) using the
Feynman-diagrammatic approach and the on-shell renormalization scheme. We
incorporate the Higgs-boson propagator corrections, evaluated up to two-loop
order, into the prediction of the cross sections for the Higgs-boson production
mechanism e+e- -> hZ, hA. The propagator corrections consist of the full
one-loop contribution, including the effects of non-vanishing external
momentum, and at the two-loop level of the dominant corrections of O(alpha
alpha_s) and further sub-dominant contributions. The results are supplemented
with the complete set of one-loop vertex and box corrections. The effects of
the two-loop propagator corrections are investigated in detail. We briefly
discuss also the effect of the box contributions for high $\sqrt{s}$. We
compare our results with the case where only the corrections to the effective
mixing angle, evaluated within the renormalization-group-improved one-loop
Effective Potential approach, are taken into account. We find agreement better
than 10% for LEP2 energies and deviations larger than 20% for $\sqrt{s}$ = 500
GeV.


title:
General analysis of time evolution of decay spectrum in B^0 -> pi^+ pi^-
  l^+ l^-

abstract:
  Using the general, model independent form of effective Hamiltonian, the decay
spectrum of B^0 -> pi^+ pi^- l^+ l^- decay is studied. The sensitivity of
experimentally measurable asymmetries to the new Wilson coefficients and time
is studied. It is observed that different asymmetries are sensitive to the new
Wilson coefficients and they can serve as an efficient tool for establishing
new physics beyond SM.


title: GigaZ: High Precision Tests of the SM and the MSSM

abstract:
  The high-energy lepton collider TESLA can be operated in the GigaZ mode on
the Z resonance, producing a billion Z bosons per year. This will allow the
measurement of the effective electroweak mixing angle to an accuracy much
better than one part in 10,000. Similarly, the W boson mass is expected to be
measurable with an error of 6 MeV near threshold. We discuss the impact of
these observables on the accuracy with which the Higgs boson mass can be
determined from loop corrections within the Standard Model. We also study
indirect constraints on new mass scales within the Minimal Supersymmetric
Standard Model.


title: Dualising the Dual Standard Model

abstract:
  We discuss how the dual standard model and the dualised standard model are
complementary theories. That is, how their implications have no overlap, whilst
together they explain most features of the standard model. To illustrate how
these two theories might be combined we consider the dual standard model in a
theta vacuum. Whilst there are issues to be considered, the dual standard model
does then appear to become naturally dualised. This supports an origin of a
dual formulation of the standard model through the properties of SU(5) solitons
in a theta vacuum.


title: Physics Implications of Precision Electroweak Experiments

abstract:
  A brief review is given of precision electroweak physics, and its
implications for establishing the standard model and constraining the
possibilities for new physics at the TeV scale and beyond.


title:
Model independent radiative corrections in processes of polarized
  electron-nucleon elastic scattering

abstract:
  The explicit formulae for radiative correction (RC) calculation for elastic
$ep$-scattering is presented. Two typical measurements of polarization
observables such as beam-target asymmetry or recoil proton polarization, are
considered. Possibilities to take into account realistic experimental
acceptances are discussed. The Fortran code MASCARAD for providing the RC
procedure is presented. Numerical analysis is done for kinematical conditions
of TJNAF.


title: Deeply inelastic scattering off nuclei at RHIC

abstract: We discuss the physics case for an electron--nucleus collider at RHIC.


title: Quantum Gravity Resolution to the Cosmological Constant Problem

abstract:
  A finite quantum gravity theory is used to resolve the cosmological constant
problem. A fundamental quantum gravity scale, \Lambda_G \leq 10^{-3} eV, is
introduced above which the quantum corrections to the vacuum energy density
coupled to gravity are exponentially suppressed by a graviton vertex form
factor, yielding an observationally acceptable value for the particle physics
contribution to the cosmological constant. Classical Einstein gravity retains
its causal behavior as well as the standard agreement with observational data.


title:
Light-cone distribution functions for B decays at subleading order in
  1/mb

abstract:
  We construct the higher twist structure functions that describe inclusive b
hadron decays in regions of phase space where the hadronic decay products carry
high energy but have low invariant mass. We show that, for B meson decays,
there are four new non-vanishing matrix elements of non-local operators. We
show that to subleading twist these decays are parametrized in terms of four
functions. We compute the tree-level matching for a general heavy-to-light
current and apply it to B -> X_s gamma. Using a simple model for these
functions we estimate the subleading twist contributions to this decay.


title: Finite Radiative Electroweak Symmetry Breaking from the Bulk

abstract:
  A new physical origin for electroweak symmetry breaking is proposed,
involving compact spatial dimensions of scale 1/R \approx 1 TeV. The higher
dimensional theory is supersymmetric, and hence requires the top-quark Yukawa
coupling to be localized on some ``Yukawa brane'' in the bulk. The short
distance divergence in the Higgs-boson mass is regulated because supersymmetry
is unbroken in the vicinity of this Yukawa brane. A finite, negative Higgs
mass-squared is generated radiatively by the top-quark supermultiplet
propagating a distance of order R from the Yukawa brane to probe supersymmetry
breaking. The physics of electroweak symmetry breaking is therefore closely
related to this top propagation across the bulk, and is dominated by the mass
scale 1/R, with exponential insensitivity to higher energy scales. The masses
of the superpartners and the Kaluza-Klein resonances are also set by the mass
scale 1/R, which is naturally larger than the W boson mass by a loop factor.
  Explicit models are constructed which are highly constrained and predictive.
The finite radiative correction to the Higgs mass is computed, and the Higgs
sector briefly explored. The superpartner and Kaluza-Klein resonance spectra
are calculated, and the problem of flavor violation from squark and slepton
exchange is solved. Important collider signatures include highly ionizing
charged tracks from stable top squarks, and events with two Higgs bosons and
missing transverse energy.


title: Looking for the Charged Higgs Boson at LHC

abstract:
  I discuss LHC signatures of the charged Higgs boson of the MSSM, focussing
mainly on the case of the charged Higgs boson being heavier than top quark.


title: Diffractive Structure Functions at the Tevatron

abstract:
  We have studied events with a high-x_F antiproton and two central jets with
E_T>7 GeV in CDF, in p+p_bar collisions at sqrt(s) = 1800 GeV. From the di-jet
kinematics we derive the diffractive structure function of the antiproton. We
also find an excess of events with a rapidity gap at least 3.5 units wide in
the proton direction, which we interpret as di-jet production in double pomeron
exchange events. We find non-factorization between our single diffractive
results and (a) diffraction in ep at HERA (b) double pomeron exchange.


title: Diffractive parton distributions from the saturation model

abstract:
  We review diffractive deep inelastic scattering (DIS) in the light of the
collinear factorization theorem. This theorem allows to define diffractive
parton distributions in the leading twist approach. Due to its selective final
states, diffractive DIS offers interesting insight into the form of the
diffractive parton distributions which we explore with the help of the
saturation model. We find Regge-like factorization with the correct energy
dependence measured at HERA. A remarkable feature of diffractive DIS is the
dominance of the twist-4 contribution for small diffractive masses. We quantify
this effect and make a comparison with the data.


title: New Physics Working Group Summary of LCWS2000 at FNAL

abstract:
  Here I summarize P5-WG (New/Alternative Physics Working Group) of
LCWS2000@FNAL, held on Oct 24-28, 2000. There were 13 talks altogether, 7 talks
on collider signals from new particles/interactions and 6 talks on extra
dimensional physics. We had very active and hot discussions among participants
for those new/alternative physics/ideas.


title: Heavy-quarkonium hadron cross section in QCD at leading twist

abstract:
  We compute the total cross section of a heavy quarkonium on a hadron target
in leading twist QCD, including target mass corrections. Our method relies on
the analytical continuation of the operator product expansion of the scattering
amplitude, obtained long ago by Bhanot and Peskin. The cross section has a
simple partonic form, which allows us to investigate the phenomenology of J/psi
and Upsilon dissociation by both pions and protons.


title:
$\mu$-term due to the non-universal supersymmetry breaking and the Higgs
  mass

abstract:
  We propose a solution to the $\mu$-problem due to the non-universal soft
supersymmetry breaking in a class of supersymmetric extensions of the SM with
an extra U(1) and the NMSSM. Our scenario resembles an earlier one which has
been proposed as a solution to the $\mu$-problem in the framework of similar
models but it has rather different features from that. Theoretically crucial
points in the present scenario are the realization of the required
non-universal soft supersymmetry breaking parameters and the concern to avoid
the vacuum instability due to tadpoles. We discuss them in some detail. In
particular, on the non-universal soft supersymmetry breaking we discuss the
superstring and the field theory with reduction of couplings possibilities. We
also study the weak scale radiative symmetry breaking in the considered models
and estimate the upper mass bound of the lightest neutral Higgs scalar. The
latter tends to be smaller in the present scenario as compared to the previous
one.


title: Electroweak renormalization group corrections in high energy processes

abstract:
  At energies ($\sqrt{s}$) much higher than the electroweak gauge boson masses
($M$) large logarithmic corrections of the scale ratio $\sqrt{s}/M$ occur.
While the electroweak Sudakov type double (DL) and universal single (SL)
logarithms have recently been resummed, at higher orders the electroweak
renormalization group (RG) corrections are folded with the DL Sudakov
contributions and must be included for a consistent subleading treatment to all
orders. In this paper we derive first all relevant formulae for massless as
well as massive gauge theories including all such terms up to order ${\cal O}
(\alpha^n \beta_0 \log^{2n-1} \frac{s}{M^2})$ by integrating over the
corresponding running couplings. The results for broken gauge theories in the
high energy regime are then given in the framework of the infrared evolution
equation (IREE) method. The analogous QED-corrections below the weak scale $M$
are included by appropriately matching the low energy solution to the
renormalization group improved high energy results. The corrections are valid
for arbitrary external lines and largest in the scalar Goldstone and Higgs
boson sector as well as for transverse gauge bosons. At TeV energies, these
SL-RG terms change scattering cross sections in the percentile regime at two
loops and are thus non-negligible for precision objectives at future linear
colliders.


title: The CMSSM Parameter Space at Large tan beta

abstract:
  We extend previous combinations of LEP and cosmological relic density
constraints on the parameter space of the constrained MSSM, with universal
input supersymmetry-breaking parameters, to large tan beta. We take account of
the possibility that the lightest Higgs boson might weigh about 115 GeV, but
also retain the possibility that it might be heavier. We include the most
recent implementation of the b to s gamma constraint at large tan beta. We
refine previous relic density calculations at large tan beta by combining a
careful treatment of the direct-channel Higgs poles in annihilation of pairs of
neutralinos chi with a complete treatment of chi - stau coannihilation, and
discuss carefully uncertainties associated with the mass of the b quark. We
find that coannihilation and pole annihilations allow the CMSSM to yield an
acceptable relic density at large tan beta, but it is consistent with all the
constraints only if m_chi > 140 (180) GeV for mu > 0 (mu < 0) for our default
choices m_b(m_b) = 4.25 GeV, m_t = 175 GeV, and A_0 = 0.


title: Parametric Resonance of Neutrino Oscillations in Electromagnetic Wave

abstract:
  Within the Lorentz invariant formalizm for description of neutrino evolution
in electromagnetic fields and matter we consider neutrino spin oscillations in
the circular polarized electromagnetic wave, the amplitude of which is a
modulated function of time. It is shown for the first time that the parametric
resonance of neutrino oscillations can occur in such a system.


title: Hard collisions of photons: plea for a common language

abstract:
  An attempt is made to sort out ambiguities existing in the current usage of
several basic concepts describing hard collisions of photons. It is argued that
appropriate terminology is often a prerequisite for correct physics.


title: Muon-electron conversion in strange quark sea

abstract:
  We study nuclear muon-electron (mu-e) conversion in the general framework of
effective Lagrangian approach without referring to any specific realization of
the physics beyond the standard model (SM) responsible for lepton flavor
violation (LFV). All the possible types of short range interactions
(non-photonic mechanisms), i.e. (pseudo-)scalar, (axial-)vector and tensor, are
included in our formalism. We show that the mu-e conversion in the strange
nucleon sea via the scalar interactions is comparable with that in the valence
quarks. This provides an insight into the strange quark couplings beyond the
SM. From the available experimental data on mu-e conversion and expected
sensitivities of planned experiments we derived upper bounds on the generic LFV
- parameters of mu-e conversion sensitive to the relevant u-,d- and s-quark
couplings.


title: Comment on: Neutrino Mass Anarchy

abstract:
  Recently Hall, Murayama and Weiner (Phys. Rev. Lett. 84 (2000) 2572,
[hep-ph/9911341]) claimed that neutrino oscillation data are well accounted for
by a neutrino mass matrix which appears to have random entries. Here this claim
is disputed by constructing a specific counter example. Structure in the
neutrino mass matrix is clearly preferred over random matrices.


title: Discriminating Neutrino See-Saw Models

abstract:
  We consider how well current theories can predict neutrino mass and mixing
parameters, and construct a statistical discriminator which allows us to
compare different models to each other. As an example we consider see-saw
models based on family symmetry, and single right-handed neutrino dominance,
and compare them to each other and to the case of neutrino anarchy with random
entries in the neutrino Yukawa and Majorana mass matrices. The predictions
depend crucially on the range of the undetermined coefficients over which we
scan, and we speculate on how future theories might lead to more precise
predictions for the coefficients and hence for neutrino observables. Our
results indicate how accurately neutrino masses and mixing angles need to be
measured by future experiments in order to discriminate between current models.


title: Effective action for bubble nucleation rates

abstract:
  We develop a method to calculate the prefactor in the expression for the
bubble nucleation rate. A fermion with Yukawa coupling is considered where a
step potential can be used as a good approximation in the thin wall limit.
Corrections due to thicker walls are considered by perturbing about the thin
wall case. We derive the thermal one loop effective action, calculating it
numerically, and find that the prefactor in the nucleation rate can both
suppress and enhance, for a given temperature, when the usual renormalisation
conditions are applied to the effective potential.


title: On the Resummation of Large QCD Logarithms in Higgs -> 2 Photons Decay

abstract:
  We study the strong corrections to the Higgs coupling to two photons. This
coupling is the dominant mechanism for Higgs production in photon-photon
collisions. In addition, the two photon decay mode of the Higgs is an important
and relatively background free channel of relevance at the LHC and the
Tevatron. We develop a method for the resummation of large QCD corrections in
the form of Sudakov-like logarithms of the type \alpha_s^n\ln^{2n}(m/m_H) and
\alpha_s^n\ln^{2n-1}(m/m_H) (where m is the light quark mass) which can
contribute to this process in certain models (for example, the MSSM for large
tan \beta) up to next-to-leading-logarithmic (NLL) accuracy. The NLL correction
is moderate, the substantial part of which comes from terms not related to
running coupling effects.


title: Neutrinos as a signature of ultrahigh energy photons at high red shift

abstract:
  Sources of ultrahigh energy photons operating at high red shift produce a
diffuse background of neutrinos. At high red shift, when the cosmic microwave
background radiation has a higher temperature, an electromagnetic cascade
originated by an energetic photon can generate neutrinos via muon and pion
production and decay. We have calculated numerically the neutrino spectrum
produced by various photon sources. A distinctive feature of the produced flux
is a ``bump'' in the spectrum at neutrino energies $E \sim 10^{17}$eV. The
produced flux is largest for $m=3$ sources ({\it e.g} necklaces), with $E^2
J(E) \sim 10 {\rm eV} {\rm cm}^{-2} {\rm s}^{-1} {\rm sr}^{-1}$ at these
energies. Detection of such neutrinos can help understand the origin of
ultrahigh energy cosmic rays.


title: Multi-Boson Effects in Bose-Einstein Interferometry

abstract:
  Multi-boson symmetrization effects on two-particle Bose-Einstein
interferometry are studied for ensembles with arbitrary multiplicity
distributions. In the general case one finds interesting residual correlations
which require a modified framework for extracting information on the source
geometry from two-particle correlation measurements. In sources with high
phase-space densities, multi-boson effects modify the Hanbury Brown-Twiss (HBT)
radius parameters and simultaneously generate strong residual correlations. We
clarify their effect on the correlation strength (intercept parameter) and thus
explain a variety of previously reported puzzling multi-boson symmetrization
phenomena. For event ensembles of (approximately) fixed multiplicity, the
residual correlations lead to a minimum in the correlation function at non-zero
relative momentum, which can be practically exploited to search, in a
model-independent way, for multi-boson symmetrization effects in high-energy
heavy-ion experiments.


title: An obvious isospin breaking correction to epsilon' of kinematical origin

abstract:
  Isospin breaking correction to the $\Delta I = {1/2}$ decay of $K\to\pi\pi$
generates a large enough contribution to $\epsilon'$ through an induced $\Delta
I = {3/2}$ amplitude in $K_L$ decay. Aside from the $\pi$-$\eta$ and
$\pi$-$\eta'$ mixing contributions, there is a correction of kinematical origin
due to the final-state $\pi^{\pm}$-$\pi^0$ mass difference, which is
unambiguously calculable from the low-energy off-shell behavior of the
$K\to\pi\pi$ amplitude. This correction to $\epsilon'$ reduces the isospin
breaking parameter $\Omega_{IB}$ by 0.06, which is nearly one half of the
$\pi$-$\eta$ mixing effect computed with chiral Lagrangians to $O(p^2)$.


title: Transverse Energy and Minijets in High Energy Collisions

abstract:
  Minijet production and transverse energy are important not only to understand
hadronic collisions, but also for the interpretation of nucleus collisions at
RHIC and LHC, where it determines the ``initial conditions'' for the flow in a
hadronic soup or a plasma. For high collision energies and small qT (minijets)
we enter the BFKL region. This implies that we must take into account off-shell
parton cross sections and non-integrated structure functions
(kT-factorization). It is also essential to avoid double counting, as one
emitted parton is a participant in two different subcollisions. The LDC model,
developed in Lund to describe DIS, provides a very convenient formalism to
handle these problems. The result is a dynamical suppression of minijets for
small qT. The resulting transverse energy flow is similar to the result from a
''naive'' calculation based on integrated structure functions with a qT cut-off
around 2 GeV.


title: Tests of QCD in Two Photon PHysics

abstract:
  Recent developments in the field of Two Photon Physics at LEP, and their
contribution to QCD are reviewed.


title: The matter effect to T-violation at a neutrino factory

abstract:
  We analyzed T-violation in neutrino oscillation by using perturbation methods
with respect to $\Delta m_{21}^2L/2E$ and $\delta a(x)L/2E$, where $\delta
a(x)$ represents the matter density fluctuation from its average value. We
found that the matter contribution to T-violation arises from interferences
between $\Delta m_{21}^2L/2E$ and $\delta a(x) L/2E$. In the 2nd order, the
symmetric and asymmetric matter density fluctuations give effects to the $\sin
\delta$ (intrinsic) and the $\cos \delta$ (fake) parts of T-violation. We give
their analytic forms and analyze the matter contribution to the $\sin \delta$
and $\cos \delta$ terms. We found that, for L=3000km, both the symmetric and
asymmetric matter density fluctuations give negligible contributions to
T-violation, and that thus the constant (average) matter density gives a good
approximation. On the other hand, we argue that, for L=7000km or longer length,
T-violation turns out to become very small due to cancellation between the 1st
and the 2nd order terms. This shows that the constant (average) matter
approximation is not valid.


title:
Photoproduction of eta and eta-prime mesons off nucleons close to
  threshold

abstract:
  The importance of Born terms and resonance exchange for eta and eta-prime
photoproduction off both the proton and neutron within U(3) baryon chiral
perturbation theory is investigated. Low-lying resonances such as the vector
mesons and J^P= 1/2^+, 1/2^- baryon resonances are included explicitly and
their contributions together with the Born terms are calculated. The coupling
constants of the resonances are determined from strong and radiative decays. We
obtain reasonable agreement with experimental data near threshold.


title:
The Generic Supersymmetric Standard Model as the Complete Theory of
  Supersymmetry without R-parity

abstract:
  The generic supersymmetric standard model is a model built from a
supersymmetrized standard model field spectrum the gauge symmetries only. The
popular minimal supersymmetric standard model differs from the generic version
in having R-parity imposed by hand. We review an efficient formulation of the
model in which all the admissible R-parity violating terms are incorporated
without bias. The model gives many new interesting R-parity violating
phenomenological features only started to be studied recently. Some of our
recent results will be discussed, including newly identified 1-loop
contributions to neutrino masses and electric dipole moments of neutron and
electron. This is related to the largely overlooked R-parity violating
contributions to squark and slepton mixings, which we also present in detail.


title: Neutrino oscillations in the early Universe

abstract:
  We discuss the oscillations effects on neutrinos in the early Universe and
update the cosmological constraints on the oscillation parameters. It is shown
that sterile LOW solution to the solar neutrino problem is almost completely
excluded from cosmological nucleosynthesis considerations. Two possibilities
for the relaxation of this constraint are discussed: high primordial helium-4
yield and a relic lepton asymmetry present at nucleosynthesis epoch. The
numerical analysis proved that Y_p=0.25 only relaxes the constraint on LOW
solution, while L > 10^{-5} is capable to remove it.


title:
The bound state corrections to the semileptonic decays of the B meson.
  The light-front approach versus ACM model

abstract:
  A generalization of the parton-like formula is used for the first time to
find the differential distributions in the inclusive semileptonic weak decays
of the B meson. The main features of this new approach are the treatment of the
b-quark as an on-mass-shell particle and the inclusion of the effects arising
from the b-quark transverse motion in the B-meson. Using the b-quark
light-front (LF) distribution function related to the equal time momentum wave
function taken from the ACM model we compute the electron energy spectra and
the total semileptonic widths of the B meson. We find an impressive agreement
between the electron energy spectra calculated in the LF approach and the ones
obtained in the ACM model, provided the b quark mass is identified with the
average of the floating b quark mass in the ACM model. In spite of the
simplicity of the model we obtain a fair good description of the CLEO data for
V_{cb}=0.042.


title:
Pair production of charged Higgs scalars from electroweak gauge boson
  fusion

abstract:
  We compute the contribution to charged Higgs boson pair production at the
Large Hadron Collider (LHC) due to the scattering of two electroweak (EW) gauge
bosons, these being in turn generated via bremsstrahlung off incoming quarks: q
q --> q q V^*V^* --> q q H^+H^- (V=gamma,Z,W^{+/-}). We verify that the
production cross section of this mode is tan beta independent and show that it
is smaller than that of H^+H^- production via q q-initiated processes but
generally larger than that of the loop-induced channel gg --> H^+H^-. Pair
production of charged Higgs bosons is crucial in order to test EW symmetry
breaking scenarios beyond the Standard Model (SM). We show that the detection
of these kind of processes at the standard LHC is however problematic, because
of their poor production rates and the large backgrounds.


title: Higgs Production and Decay in the MSSM: Status and Perspectives

abstract:
  The theoretical predictions in the MSSM for Higgs-boson production at a
future e^+e^- Linear Collider and Higgs-boson decay processes are discussed
focusing in particular on recent diagrammatic two-loop results in the MSSM
Higgs sector. The present status of the theoretical predictions is briefly
summarized, and it is emphasized that considerable improvements will be
necessary in order to match the high experimental accuracy achievable at a
future Linear Collider.


title: Multiparticle production at RHIC and LHC: a classical point of view

abstract:
  We report results of our ongoing nonperturbative numerical study of a
classical effective theory describing low-x partons in the central region of a
heavy-ion collision. In particular, we give estimates of the initial transverse
energies and multiplicities for a wide range of collision regimes, including
those at RHIC and at LHC.


title:
Parton Densities and Fragmentation Functions from Polarized Lambda
  Production in Semi-Inclusive DIS

abstract:
  We consider the longitudinal polarization of Lambda and Lambda-bar produced
in the current fragmentation region of polarized deep inelastic scattering. We
show how the various cross sections can be used to test the underlying parton
dynamics, and how one can extract information about certain parton densities
which are poorly known, in particular the polarized strange density sum
Delta-s(x) + Delta-s-bar(x), and about fragmentation functions which are
totally unknown and which are difficult to access by other means. We show also
how one can obtain information concerning the intriguing question as to whether
s(x) = s-bar(x) and whether Delta-s(x) = Delta-s-bar(x).


title:
Phase transitions in the early and the present Universe: from the big
  bang to heavy ion collisions

abstract:
  In these lectures I discuss cosmological phase transitions with the goal of
establishing the possibility of observational consequences. I argue that the
{\em only} phase transition amenable of experimental study within the
foreseeable future is that predicted by QCD and discuss some of the potential
observational cosmological consequences associated with this phase
transition(s). I describe the experimental effort to study the QCD phase
transition(s) at RHIC and SPS and summarize some of the recent experimental
results. The possibility of novel phases of QCD in the core of pulsars is
discussed along with the suggested observational consequences. A brief review
of standard big bang cosmology as well as the astrophysics of compact stars
sets the stage for understanding the observational cosmological and
astrophysical consequences of phase transitions in the standard model.


title:
Factorisation in Deeply Virtual Compton Scattering: Local OPE Formalism
  and Structure Functions

abstract:
  We give a complete treatment of factorisation of Deeply Virtual Compton
Scattering (DVCS) in the generalised Bjorken limit, using the local Operator
Product Expansion (OPE). The method allows a straightforward proof that, at
leading twist, the DVCS amplitude factorises into an integral over coefficient
functions and Skewed Parton Distribution Functions (SPDFs). The integral is
well defined for on-shell final state photon if the Wilson coefficients satisfy
a certain factorisation condition, which we derive. We also show that it
enables a simple proof that soft singularities either cancel out or, in the
case where the final state photon is on shell, are integrable. This confirms
the argument of Collins and Freund. Further, we repeat the tree-level
calculation of twist-three contributions to DVCS off a scalar target, where
factorisation was found to be violated. We propose a new definition of the
structure functions and calculate the coefficient functions, which are such
that factorisation works.


title: The Muon Anomalous Magnetic Moment: A Harbinger For "New Physics"

abstract:
  QED, Hadronic, and Electroweak Standard Model contributions to the muon
anomalous magnetic moment, a_mu = (g_mu-2)/2, and their theoretical
uncertainties are scrutinized. The status and implications of the recently
reported 2.6 sigma experiment vs.theory deviation a_mu^{exp}-a_mu^{SM} =
426(165) times 10^{-11} are discussed. Possible explanations due to
supersymmetric loop effects with m_{SUSY} \simeq 55 sqrt{tan beta} GeV,
radiative mass mechanisms at the 1--2 TeV scale and other ``New Physics''
scenarios are examined.


title:
QCD sum rules for the pseudoscalar decay constants - To constrain the
  strange quark mass

abstract:
  We study the higher order corrections of quark masses to the
Gell-Mann$-$Oakes$-$Renner (GOR) relation by constructing QCD sum rules
exclusively for pseudoscalar mesons from the axial-vector correlation function,
$i \int d^4x~ e^{ip\cdot x} < 0| T[A_\mu (x) A_\nu (0)] | 0>$. To project out
the pseudoscalar meson contributions, we apply $-p^\mu p^\nu/p^2$ to this
correlation function and construct sum rules for the decay constants of
pseudoscalar mesons, $f_\pi, f_k$ and $f_{\eta_8}$. The OPE is proportional to
quark masses due to PCAC. To leading order in quark mass, each sum rule
reproduces the corresponding GOR relation. For kaon and $\eta_8$, the deviation
from the GOR relation due to higher orders in quark mass is found to be
substantial. But the deviation gives better agreements with the phenomenology.
Our sum rule provides a sensitive relation between $f_K$ and $m_s$, which
stringently constrain the value for $m_s$. To reproduce the experimental value
for $f_K$, $m_s$ is found to be 186 MeV at 1 GeV scale. The $f_{\eta_8}$ sum
rule also supports this finding.


title: New analytic running coupling in spacelike and timelike regions

abstract:
  The new model for the QCD analytic running coupling, proposed recently, is
extended to the timelike region. This running coupling naturally arises under
unification of the analytic approach to QCD and the renormalization group (RG)
formalism. A new method for determining the coefficients of the "analytized" RG
equation is elaborated. It enables one to take into account the higher loop
contributions to the new analytic running coupling (NARC) in a consistent way.
The expression for the new analytic running coupling, independent of the
normalization point, is obtained by invoking the asymptotic freedom condition.
It is shown that the difference between the values of the NARC in respective
spacelike and timelike regions is rather valuable for intermediate energies.
This is essential for the correct extracting of the running coupling from
experimental data. The new analytic running coupling is applied to the
description of the inclusive $\tau$ lepton decay. The consistent estimation of
the parameter $\Lambda_{QCD}$ is obtained here.


title: Neutrino oscillations in the early universe. Resonant case

abstract:
  Lepton asymmetry generated in the early universe by neutrino oscillations
into sterile partners is calculated. Kinetic equations are analytically reduced
to a simple form that permits an easy numerical treatment. Asymptotic values of
the asymmetry are at the level of 0.2-0.3 and are reasonably close to those
obtained by other groups, though the approach to asymptotics in some cases is
noticeably slower. No chaoticity is observed.


title: Fully differential QCD corrections to single top quark final states

abstract:
  A new next-to-leading order Monte Carlo program for calculation of fully
differential single top quark final states is described and first results
presented. Both the s- and t-channel contributions are included.


title: Pomeron and AdS/CFT Correspondence for QCD

abstract:
  The Maldacena conjecture that QCD is holographically dual to gravity in extra
dimensions is briefly reviewed. On the basis of this duality conjecture, the
complete glueball spectrum is computed which bares a striking resemblance to
the known $QCD_4$ spectrum as determined by lattice simulations. In particular,
a strong coupling expansion for the Pomeron intercept is obtained.


title: The two cutoff phase space slicing method

abstract:
  The phase space slicing method of two cutoffs for next-to-leading-order
Monte-Carlo style QCD corrections has been applied to many physics processes.
The method is intuitive, simple to implement, and relies on a minimum of
process dependent information. Although results for specific applications exist
in the literature, there is not a full and detailed description of the method.
Herein such a description is provided, along with illustrative examples;
details, which have not previously been published, are included so that the
method may be applied to additional hard scattering processes.


title:
Lower bound to the mass of a relativistic three-boson system in the
  light-cone

abstract:
  The lower bound masses of the ground-state relativistic three-boson system in
1+1, 2+1 and 3+1 space-time dimensions are obtained. We have considered a
reduction of the ladder Bethe-Salpeter equation to the light-front in a model
with renormalized two-body contact interaction. The lower bounds are deduced
with the constraint of reality of the two-boson subsystem mass. It is verified
that, in some cases, the lower bound approaches the ground state binding
energy. The corresponding non-relativistic limits are also verified.


title: Fragmentation Functions for Lepton Pairs

abstract:
  We calculate the fragmentation function for a light quark to decay into a
lepton pair to leading order in the QCD coupling constant. In the formal
definition of the fragmentation function, a QED phase must be included in the
eikonal factor to guarantee QED gauge invariance. We find that the longitudinal
polarization fraction is a decreasing function of the factorization scale, in
accord with the intuitive expectation that the virtual photon should behave
more and more like a real photon as the transverse momomentum of the
fragmenting quark increases.


title: New Model-Independent Limit on Muon Substructure

abstract:
  If the discrepancy between the theoretical and newly measured values of the
muon's anomalous magnetic moment is ascribed to muon substructure, there
results an improved model--independent limit on its energy scale, 1.2 TeV <
Lambda_mu < 3.2 TeV at 95% C.L.


title: QCD and Hadronic Final States at the LHC

abstract:
  Hadronic final states at the LHC will be an interesting testing ground for
QCD. A good understanding of QCD radiation will also be important for the
discovery of new physics at the LHC. I discuss some aspects of this subject and
give a few examples.


title:
Non-singlet structure function of the 3He-3H system and divergence of
  the Gottfried integral

abstract:
  We study shadowing and antishadowing corrections to the flavor non-singlet
structure function F_2(3He)-F_2(3H) and show that the difference between the
one-particle density distributions of 3He and 3H plays an important role at
very small x. We find that the flavor non-singlet structure function in these
mirror nuclei is enhanced at small x by nuclear shadowing, which increases the
nuclear Gottfried integral, integrated from 10^{-4} to 1, by 11-36 %. When
integrated from zero, the Gottfried integral is divergent for these mirror
nuclei. It seems likely that, as a consequence of charge symmetry breaking,
this may also apply to the proton-neutron system.


title: The p_T Spectrum in Heavy-Flavour Photoproduction

abstract:
  We consider the transverse-momentum distribution of heavy flavours in
photon-hadron collisions. We present a formalism in which large
transverse-momentum logarithms are resummed to the next-to-leading level, and
mass effects are included exactly up to order alpha_em alpha_s^2, so as to
retain predictivity at both small and large transverse momenta.
Phenomenological applications relevant to charm photoproduction at HERA are
given.


title: $\Delta S = 2$ decays of $B^-$ meson in MSSM and two Higgs doublet model

abstract:
  In view of the extreme smallness of $\Delta S = 2$ transitions of $B$ meson
in the Standard Model, we consider their occurence in several extensions of it.
Thus, we analyze the three - body $B^- \to K^- K^- \pi^+$ and two - body $B^-
\to K^{*-} \barK^{*0}$, $B^- \to K^- \bar K^{0}$, $B^- \to K^{*-} \bar K^{0}$,
$B^- \to K^{-} \bar K^{*0}$ decay modes both in the Standard Model and in the
Minimal Supersymmetric Model with and without ${\cal R}$ parity conservation
and in two Higgs doublet models. All five modes are found to have a branching
ratio of the order of $10^{-13}$ in the Standard Model, while the expected
branching ratio in the different extensions vary between $10^{-9} - 10^{-6}$,
for a given reasonable choice of parameters.


title: Neutrino oscillations and neutrinoless double beta decay

abstract:
  The relation between neutrino oscillation parameters and neutrinoless double
beta decay is studied, assuming normal and inverse hierarchies for Majorana
neutrino masses. For normal hierarchy the crucial dependence on U_{e3} is
explored. The link with tritium beta decay is also briefly discussed.


title: Where is the Higgs?

abstract:
  I discuss the theoretical uncertainties in the indirect Higgs mass
determination. I present the probability density function for the Higgs mass
obtained combining together the information from precision measurements with
the results from the direct search experiments carried out at LEP. The
probability that the Higgs weights less than 116 GeV comes out to be around 35
% while the 95 % upper limit is located around 210-230 GeV.


title: Resummed coefficient function for the shape function

abstract:
  We present a leading evaluation of the resummed coefficient function for the
shape function. It is also shown that the coefficient function is
short-distance-dominated. Our results allow relating the shape function
computed on the lattice to the physical QCD distributions.


title: Extra neutral gauge bosons and Higgs bosons in an E_6-based model

abstract:
  Extra neutral gauge bosons and Higgs bosons in an effective low-energy
$SU(2)_L \times SU(2)_I \times U(1)_Y \times U(1)_{Y^{\prime}}$ model, which is
a subgroup of $E_6$, are studied. $SU(2)_I$ is a subgroup of $SU(3)_R$ and
commutes with the electric charge operator, so the three corresponding gauge
bosons are neutral. Electroweak precision experiments are used to put
constraints on masses of the extra neutral gauge bosons and on the mixings
between them and the ordinary Z boson, including constraints arising from a
proposed measurment of the weak charge of the proton at Jefferson Lab. Bounds
on and relationships of masses of Higgs bosons in the supersymmetric version of
the model are also discussed.


title: Supersymmetric Phase Transitions and Gravitational Waves at LISA

abstract:
  Gravitational waves generated during a first-order electroweak phase
transition have a typical frequency which today falls just within the band of
the planned space interferometer LISA. Contrary to what happens in the Standard
Model, in its supersymmetric extensions the electroweak phase transition may be
strongly first order, providing a mechanism for generating the observed baryon
asymmetry in the Universe. We show that during the same transition the
production of gravitational waves can be rather sizable. While the energy
density in gravitational waves can reach at most $h_0^2 \Omega_{\rm gw}\simeq
10^{-16}$ in the Minimal Supersymmetric Standard Model, in the Next-to-Minimal
Supersymmetric Model, in some parameter range, $h_0^2 \Omega_{\rm gw}$ can be
as high as $4\times 10^{-11}$. A stochastic background of gravitational waves
of this intensity is within the reach of the planned sensitivity of LISA. Since
in the Standard Model the background of gravitational waves is totally
neglegible, its detection would also provide a rather unexpected experimental
signal of supersymmetry and a tool to descriminate among supersymmetric models
with different Higgs content.


title: Minimisation of a one-loop charge breaking effective potential

abstract:
  We compute the field derivatives of a one-loop charge breaking effective
potential and analyse their effect in its minimisation. The impact on charge
breaking bounds on the MSSM parameters is discussed.


title: How many family-independent, independent U(1)'s, can we gauge?

abstract:
  In the context of SU(3)_c x SU(2)_L x [U(1)]^n, SU(3)_c x SU(2)_L x SU(2)_R x
[U(1)]^n' and SU(3)_c x SU(3)_L x[U(1)]^n'', we analyze the possible values for
n, n' and n''. That is, we look for the number of family-independent,
independent abelian hypercharges that can be gauged in each one of those
models. We find that n=n'=1 for the minimal fermion content, but n can take any
value if we add the right-handed neutrino field to each family in the Standard
Model.


title: Fundamental Parameters from Precision Tests

abstract:
  I review how electroweak precision observables can be used to constrain the
Higgs boson mass and the strong coupling constant. Implications for physics
beyond the Standard Model are also addressed.


title: Extra Families, Higgs Spectrum and Oblique Corrections

abstract:
  The standard model accommodates, but does not explain, three families of
leptons and quarks, while various extensions suggest extra matter families. The
oblique corrections from extra chiral families with relatively light
(weak-scale) masses, $M_{f} \sim <H> $, are analyzed and used to constrain the
number of extra families and their spectrum. The analysis is motivated, in
part, by recent N = 2 supersymmetry constructions, but is performed in a
model-independent way. It is shown that the correlations among the
contributions to the three oblique parameters, rather than the contribution to
a particular one, provide the most significant bound. Nevertheless, a single
extra chiral family with a constrained spectrum is found to be consistent with
precision data without requiring any other new physics source. Models with
three additional families may also be accommodated but only by invoking
additional new physics, most notably, a two-Higgs-doublet extension. The
interplay between the spectra of the extra fermions and the Higgs boson(s) is
analyzed in the case of either one or two Higgs doublets, and its implications
are explored. In particular, the precision bound on the SM-like Higgs boson
mass is shown to be significantly relaxed in the presence of an extra
relatively light chiral family.


title:
Implications of Muon g-2 for Supersymmetry and for Discovering
  Superpartners Directly

abstract:
  We study the implications of interpreting the recent muon g-2 deviation from
the Standard Model prediction as evidence for virtual superpartners, with very
general calculations that include effects of phases and are consistent with all
relevant constraints. The most important result is that there are upper limits
on masses: at least one superpartner mass is below about 350 GeV (for the
theoretically preferred value of tan(beta)=35) and may be produced at the
Fermilab Tevatron in the upcoming run, and there must be chargino, neutralino,
and slepton masses below about 600 GeV. In addition, tan(beta) must be larger
than about 8.


title: Supersymmetry and the Anomalous Anomalous Magnetic Moment of the Muon

abstract:
  The recently reported measurement of the muon's anomalous magnetic moment
differs from the standard model prediction by 2.6 standard deviations. We
examine the implications of this discrepancy for supersymmetry. Deviations of
the reported magnitude are generic in supersymmetric theories. Based on the new
result, we derive model-independent upper bounds on the masses of observable
supersymmetric particles. We also examine several model frameworks. The sign of
the reported deviation is as predicted in many simple models, but disfavors
anomaly-mediated supersymmetry breaking.


title:
Implications of muon anomalous magnetic moment for supersymmetric dark
  matter

abstract:
  The anomalous magnetic moment of the muon has recently been measured to be in
conflict with the Standard Model prediction with an excess of 2.6 sigma. Taking
the excess at face value as a measurement of the supersymmetric contribution,
we find that at 95% confidence level it imposes an upper bound of 500 GeV on
the neutralino mass and forbids higgsinos as being the bulk of cold dark
matter. Other implications for the astrophysical detection of neutralinos
include: an accessible minimum direct detection rate, lower bounds on the
indirect detection rate of neutrinos from the Sun and the Earth, and a
suppression of the intensity of gamma-ray lines from neutralino annihilations
in the galactic halo.


title: pQCD Structure and Hadronization in Jets and Heavy-ion Collisions

abstract:
  Implications of hadronization as a rapid traversal of the QCD phase boundary
are explored for correlation structures in jets, N-N collisions and heavy-ion
collisions. Hadronization viewed as a partition of the prehadonic system
restricts the scale interval over which power-law jet correlation structures
survive. Rapid traversal of the QCD phase boundary may result in a lattice-like
residual structure in N-N and A-A conifiguration space accessible to
momentum-space correlation analysis via Hubble flow.


title: Breit-Wigner formalism for non-Abelian theories

abstract:
  The consistent description of resonant transition amplitudes within the
framework of perturbative field theories necessitates the definition and
resummation of off-shell Green's functions, which must respect several crucial
physical requirements. In particular, the generalization of the usual
Breit-Wigner formalism in a non-Abelian context constitutes a highly
non-trivial problem, related to the fact that the conventionally defined
Green's functions are unphysical. We briefly review the main field-theoretical
difficulties arising when attempting to use such Green's functions outside the
confines of a fixed order perturbative calculation, and explain how this task
has been successfully accomplished in the framework of the pinch technique.


title:
Semileptonic Decays of $B_c$ Meson to a P-Wave Charmonium State $\chi_c$
  or $h_c$

abstract:
  The semileptonic decays of meson $B_c$ to a P-wave charmonium state
$\chi_c(^3P_J)$ or $h_c(^1P_1)$ are computed. The results show that the decays
are sizable so they are accessible in Tevatron and in LHC, especially, with the
detectors LHCB and BTeV in the foreseeable future, and of them, the one to the
$^1P_1$ charmonium state potentially offers us a novel window to see the
unconfirmed $h_c$ particle. In addition, it is pointed out that since the two
charmonium radiative decays $\chi_c(^3P_{1,2}) \to J/\psi+\gamma$ have sizable
branching ratios, the cascade decays of the concerned decays and the charmonium
radiative decays may affect the result of the observing the $B_c$ meson through
the semileptonic decays $B_{c}\to {J/\psi}+{l}+\nu_{l}$ substantially.


title: Low-x Physics at HERA

abstract:
  Recent HERA data on structure functions and reduced cross-sections are
presented and their significance for our understanding of the low-x region is
discussed.


title: Classical behaviour after a phase transition

abstract:
  We analyze the onset of classical behaviour after a second-order phase
transition by considering a scalar field theory in which the system-field
interacts with its environment, represented both by further fields and by its
own short-wavelength modes. Within our approximations we see that the
long-wavelength modes have become classical by the time that the transition has
been first implemented (the spinodal time).


title:
Closed-Time Path Integral Formalism and Medium Effects of
  Non-Equilibrium QCD Matter

abstract:
  We apply the closed-time path integral formalism to study the medium effects
of non-equilibrium gluon matter. We derive the medium modified resummed gluon
propagator to the one loop level in non-equilibrium in the covariant gauge. The
gluon propagator we derive can be used to remove the infrared divergences in
the secondary parton collisions to study thermalization of minijet parton
plasma at RHIC and LHC.


title: Gluon depletion and J/psi suppression in pA collisions

abstract:
  The gluon distribution of a nucleon propagating through a nucleus can change
depending on how far the penetration depth is. It is a nonperturbative process
that we describe by an evolution equation. The kernel of the integral equation
is to be determined by a phenomenological study of J/psi suppression in pA
collision. The data of E866 on alpha(x_F) shows significant dependence on x_F
at large x_F. It presents a feature that has not been explained by any hadronic
absorption model. We show that gluon depletion is a simple mechanism that can
account for it. The result has far-reaching implications on the role of partons
in nuclear collisions.


title: Sterile neutrinos in tau lepton decays

abstract:
  We study possible contributions of heavy sterile neutrinos $\nu_h$ to the
decays $\tau^-\to e^{\pm}(\mu^{\pm})\pi^{\mp}\pi^-$. From the experimental
upper bounds on their rates we derive new constraints on the $\nu_h-\nu_{\tau}$
mixing in the mass region $140.5{MeV}\leq m_{\nu_h}\leq 1637$ MeV. We discuss
cosmological and astrophysical status of $\nu_h$ in this mass region and
compare our constraints with those recently derived by the NOMAD collaboration.


title:
Aspects of Supersymmetric Models with a Radiatively Driven Inverted Mass
  Hierarchy

abstract:
  A promising way to reconcile naturalness with a decoupling solution to the
SUSY flavor and CP problems is suggested by models with a radiatively driven
inverted mass hierarchy (RIMH). The RIMH models arise naturally within the
context of SUSY SO(10) grand unified theories. In their original form, RIMH
models suffer from two problems: 1.) obtaining the radiative breakdown of
electroweak symmetry, and 2.) generating the correct masses for third
generation fermions. The first problem can be solved by the introduction of
SO(10) D-term contributions to scalar masses. We show that correct fermion
masses can indeed be obtained, but at the cost of limiting the magnitude of the
hierarchy that can be generated. We go on to compute predictions for the
neutralino relic density as well as for the rate for the decay $b\to s\gamma$,
and show that these yield significant constraints on model parameter space. We
show that only a tiny corner of model parameter space is accessible to Fermilab
Tevatron searches, assuming an integrated luminosity of 25~$fb^{-1}$. We also
quantify the reach of the CERN LHC collider for this class of models, and find
values of $m_{\tg}\sim 1600$ GeV to be accessible assuming just 10 fb$^{-1}$ of
integrated luminosity. In an Appendix, we list the two loop renormalization
group equations for the MSSM plus right handed neutrino model that we have used
in our analysis.


title:
Upper Limits on Sparticle Masses from g-2 and the Possibility for
  Discovery of Supersymmetry at Colliders and in Dark Matter Searches

abstract:
  We analyze the implications of the new physics effect seen in the $g-2$
Brookhaven measurement and show that if the effect arises from supersymmetry,
then the sign of the Higgs mixing parameter $\mu$ is determined to be positive
in the standard sign convention. Further, analyses within the minimal
supergravity model show that the Brookhaven result leads to upper limits on the
universal gaugino and scalar masses of $m_{1/2}\leq 800$ GeV and $m_0\leq 1.5$
TeV for $\tan\beta\leq 55$. Our analysis strongly suggests that supersymmetry
via production of sparticles must be found at the Large Hadron Collider.
Further, sign($\mu$) positive is favorable for the discovery of supersymmetric
cold dark matter.


title: Primordial Galactic Magnetic Fields: An Application of QCD Domain Walls

abstract:
  We present a mechanism for generating primordial magnetic fields with large
correlation lengths on the order of 100 kpc today. The mechanism is based on
recently conjectured QCD domain walls or similar CP violating domain walls with
QCD scale structure. Such domain walls align the electric and magnetic dipole
moments of the nucleons shortly after the QCD phase transition, producing
electromagnetic fields correlated along the domain walls. Through the Kibble
mechanism, the domain walls attain Hubble-scale correlations which they
transfer to the aligned electromagnetic fields. Due to the CP violation, the
Hubble-scale walls produce helical (non-zero Chern-Simons) magnetohydrodynamic
turbulence which then undergoes an inverse cascade, allowing the correlation
lengths to grow to 100 kpc today. We present an estimate the magnitude of the
generated electromagnetic fields in terms of the QCD parameters. We also
discuss some other unexplained astrophysical phenomena which may be related to
this mechanism. In particular, we discuss the relation between primordial
magnetic fields and the Greisen-Zatsepin-Kuzmin (GZK) cutoff violations. We
also outline how, by creating inhomogeneities in the nucleon density, QCD
domain walls may lead to inhomogeneous big bang nucleosynthesis (IBBN)
explaining the Omega_B excess recently measured through cosmic microwave
background (CMB) distortions.


title: Present and Future CP Measurements

abstract:
  We review theoretical and experimental results on CP violation summarizing
the discussions in the working group on CP violation at the UK phenomenology
workshop 2000 in Durham.


title:
Implications of a 300-500 GeV/c^2 Z' boson on p\bar{p} collider data at
  \sqrt{s}=1.8 TeV

abstract:
  Recent analyses of precision low energy electroweak data indicate that the
deviation from the Standard Model predictions of the measurement of atomic
parity violation (2.3\sigma), the effective number of massless neutrinos
(2\sigma), and A_b (2.7\sigma) could be better described if the existence of an
extra Z' neutral gauge boson is assumed. We investigate the implications of a
300-500 GeV/c^2 extra Z' on current p\bar{p} collider data at \sqrt{s}=1.8 TeV,
including the forward-backward charge asymmetry for very high mass e^+e^-
pairs, and the invariant mass spectrum of high mass e^+e^-, \mu^+\mu^-, t\bar t
and b\bar b pairs. For example, a 500 GeV/c^2 Z' with a total production cross
section of \approx 3 pb and enhanced coupling to the third generation, better
describes both the low energy and the Tevatron data.


title: Effective Field Theory Dimensional Regularization

abstract:
  A Lorentz-covariant regularization scheme for effective field theories with
an arbitrary number of propagating heavy and light particles is given. This
regularization scheme leaves the low-energy analytic structure of Greens
functions intact and preserves all the symmetries of the underlying Lagrangian.
The power divergences of regularized loop integrals are controlled by the
low-energy kinematic variables. Simple diagrammatic rules are derived for the
regularization of arbitrary one-loop graphs and the generalization to higher
loops is discussed.


title: Electroweak Sudakov corrections at 2 loop level

abstract:
  In processes at the energy much higher than electroweak scale, weak boson
mass act as the infrared cutoff in weak boson loops and resulting Sudakov log
corrections can be as large as 10%. Since electroweak theory is off-diagonally
broken gauge theory, its IR structure is quite different from that of QCD. We
briefly review recent developments on electroweak Sudakov and discuss on the
exponentiation of Sudakov double logs and explicit 2 loop calculations in
Feynman gauge.


title:
The b->sgamma rate and Higgs boson limits in the Constrained Minimal
  Supersymmetric Model

abstract:
  New NLO b->sgamma calculations have become available using resummed radiative
corrections. Using these calculations we perform a global fit of the
supergravity inspired constrained minimal supersymmetric model (CMSSM). We find
that the resummed calculations show similar constraints as the LO calculations,
namely that only with a relatively heavy supersymmetric mass spectrum of the
order of 1 TeV the b-\tau Yukawa unification and the b->sgamma rate can coexist
in the large tanb scenario. The resummed b->sgamma calculations are found to
reduce the renormalization scale uncertainty considerably. The low tanb
scenario is excluded by the present Higgs limits from LEP II. The constraint
from the Higgs limit in the $m_0,m_{1/2}$ plane is severe, if the trilinear
coupling A_0 at the GUT scale is fixed to zero, but is considerably reduced for
$A_0\le -2m_0$. The relatively heavy SUSY spectrum required by \besg
corresponds to a Higgs mass of $m_h=119\pm 1~ (stop masses)}\pm
2~(theory)~\pm~3 (top mass) GeV $ in the CMSSM.


title:
Supersymmetric Scaling Violations (II). The general supersymmetric
  Evolution

abstract:
  Using a recursive algorithm to solve the renormalization group equations of
N=1 QCD (DGLAP), we describe the most general supersymmetric evolution of the
parton distributions. The analysis involves the regular DGLAP evolution, a
partial supersymmetric intermediate evolution and a final supersymmetric
evolution combined at various matching scales. We use a model in which
supersymmetric distributions are radiatively generated at each susy threshold
due to the mixing of the QCD anomalous dimensions with the N=1 sector. Various
types of matching conditions are considered, reflecting partially broken and
exact supersymmetric scenarios with a wide range of susy-breaking mass
parameters. Numerical results for all the distributions are presented.


title: Large effects on $\BsBs$ mixing by vector-like quarks

abstract:
  We calculate the contributions of the vector-like quark model to $\BsBs$
mixing, taking into account the constraints from the decay $B\to X_s\gamma$. In
this model the neutral bosons mediate flavor-changing interactions at the tree
level. However, $\BsBs$ mixing is dominated by contributions from the box
diagrams with the top quark and the extra up-type quark. In sizable ranges of
the model parameters, the mixing parameter $x_s$ is much different from the
standard model prediction.


title: Neutrino Oscillations with Four Generations

abstract:
  Recent status of neutrino oscillation phenomenology with four neutrinos is
reviewed. It is emphasized that the so-called (2+2)-scheme as well as the
(3+1)-scheme are still consistent with the recent solar and atmospheric
neutrino data.


title: Various Solutions of the Atmospheric Neutrino Data

abstract:
  Various solutions of the atmospheric neutrino data are reviewed. Apart from
orthodox two flavor $\nu_\mu\leftrightarrow\nu_\tau$ oscillations and three
flavor oscillations, there are still possibilities, such as four flavor
oscillations with the (2+2)- and (3+1)- schemes, a neutrino decay scenario and
decoherence, which give a good fit to the data.


title:
Possible Supersymmetric Effects on Angular Distributions in $B \to K^*
  (\to K \pi) \ell^+ \ell^- $ Decays

abstract:
  We investigate the angular distributions of the rare B decay, $B \to K^* (\to
K \pi) \ell^+ \ell^-$, in general supersymmetric extensions of the standard
model. We consider the new physics contributions from the operators
$O_{7,8,9,10}$ in small invariant mass region of lepton pair. We show that the
azimuthal angle distribution of the decay can tell us the new physics effects
clearly from the behavior of the distribution, even if new physics does not
change the decay rate substantially from the standard model prediction.


title: Decoupling Properties of MSSM particles in Higgs and Top Decays

abstract:
  We study the supersymmetric (SUSY) QCD radiative corrections, at the one-loop
level, to $h^0$, $H^{\pm}$ and t quark decays, in the context of the Minimal
Supersymmetric Standard Model (MSSM) and in the decoupling limit. The
decoupling behaviour of the various MSSM sectors is analyzed in some special
cases, where some or all of the SUSY mass parameters become large as compared
to the electroweak scale. We show that in the decoupling limit of both large
SUSY mass parameters and large CP-odd Higgs mass, the $\Gamma (h^0\to b \bar
b)$ decay width approaches its Standard Model value at one loop, with the onset
of decoupling being delayed for large $\tan\beta$ values. However, this
decoupling does not occur if just the SUSY mass parameters are taken large. A
similar interesting non-decoupling behaviour, also enhanced by $\tan\beta$, is
found in the SUSY-QCD corrections to the $\Gamma (H^+\to t \bar b)$ decay width
at one loop. In contrast, the SUSY-QCD corrections in the $\Gamma (t\to W^+ b)$
decay width do decouple and this decoupling is fast.


title:
Semileptonic B Decays - Recent Results from LEP and Comparison with
  Upsilon(4S) Data

abstract:
  Recent analyses of the LEP and Upsilon(4S) data have better outlined the
picture of semileptonic B decays. Results on inclusive and exclusive decay
branching fractions and on the extraction of the |Vub| and |Vcb| elements of
the CKM mixing matrix are discussed, together with some of the still open
questions and the sources of model systematics.


title:
Interpretation of SAMPLE and HAPPEX Experimental Results on Strange
  Nucleon Form Factors

abstract:
  A behaviour of strange nucleon form factors is predicted by means of Jaffe's
idea about the relations of $\omega$ and $\phi$ vector-meson coupling constant
ratios. Its application to a specific eight-resonance unitary and analytic
model of nucleon electromagnetic structure, describing also the time-like
nucleon electromagnetic form factor data, explains the positive central values
from recent SAMPLE and HAPPEX experiments.


title: Brane Effects on Extra Dimensional Scenarios: A Tale of Two Gravitons

abstract:
  We analyze the propagation of a scalar field in multidimensional theories
which include kinetic corrections in the brane, as a prototype for
gravitational interactions in a four dimensional brane located in a (nearly)
flat extra dimensional bulk. We regularize the theory by introducing an
infrared cutoff given by the size of the extra dimensions and a physical
ultraviolet cutoff of the order of the fundamental Planck scale in the higher
dimensional theory. We show that, contrary to recent suggestions, the radius of
the extra dimensions cannot be arbitrarily large. Moreover, for finite radii,
the gravitational effects localized on the brane can substantially alter the
phenomenology of collider and/or table-top gravitational experiments. This
phenomenology is dictated by the presence of a massless graviton, with standard
couplings to the matter fields, and a massive graviton which couples to matter
in a much stronger way. While graviton KK modes lighter than the massive
graviton couple to matter in a standard way, the couplings to matter of the
heavier KK modes are strongly suppressed.