title: Conformal Phase Transition, beta-Function, and Infrared Dynamics in QCD

abstract:
  The dynamics in QCD with different number of fermion flavors N_f is
discussed. The emphasis is on the description of the conformal phase transition
with respect to N_f separating a phase with no confinement and chiral symmetry
breaking and a phase with confinement and with chiral symmetry breaking.


title: Naturalness Re-examined: Implications for Supersymmetry Searches

abstract:
  We discuss the origin of "focus points" in the scalar mass RGEs of the MSSM
and their implications for collider searches. We present a new exact analytic
solution to the homogeneous system of scalar mass RGEs in the MSSM for general
$\tan\beta$. This is then used to prove that the focus point for $m^2_{H_u}$
depends only on the value of the top Yukawa coupling at the {\em weak} scale
(not its value at the GUT scale) and is independent of the bottom Yukawa
coupling.


title: Large CP Violation, Large Mixings of Neutrinos and the $Z_3$ Symmetry

abstract:
  We present neutrino mass matrices which predict the atmospheric neutrino
mixing to be almost maximal, $\sin^2 2\theta_{atm}>0.999$, as well as the large
solar neutrino mixing, $8/9>\sin^2 2\theta_{sol}>0.87$, and the large CP
violation (the CP violation phase in the standard form is maximal
$\delta=\pi/2$), based on the $Z_3$ symmetry.


title: Color Superconductivity in High Density Quark Matter

abstract:
  We review recent progress on the phenomena of color superconductivity in high
density quark matter. We begin with a brief overview of the unique aspects of
physics near a Fermi surface and the implications for renormalization group
(RG) techniques. We next discuss the qualitative differences between asymptotic
densities, where the effective coupling constant can be made arbitrarily small,
and intermediate densities where quark matter is still strongly coupled. It is
in the latter regime where RG techniques are particularly useful, in that they
yield a generic description of possible behaviors without relying on an
expansion in the strong coupling constant. Finally, we discuss aspects of the
QCD groundstate at asymptotic densities, which can be determined in a
systematic weak coupling expansion.


title: Post-Inflationary Reheating

abstract:
  We study a model for reheating that has been much investigated for parametric
resonance, having a quartic interaction of the scalar inflaton with another
scalar field. Attention is particularly on the quantum excitations of the
inflaton field and the metric perturbation with a smooth transition from
quantum to classical stochastic states, followed through from a specific
inflation model to a state including a relativistic fluid. The scalar fields
enter non-perturbatively but the metric enters perturbatively, and the validity
of this latter is assessed. In this model our work seems to point the large
scale curvature parameter changing.


title: Bottom Production

abstract: We review the prospects for bottom production physics at the LHC.


title:
New and Standard Physics contributions to anomalous Z and gamma
  self-couplings

abstract:
  We examine the Standard and the New Physics (NP) contributions to the ZZZ,
ZZgamma and Zgammagamma neutral gauge couplings. At the one-loop level, if we
assume that there is no CP violation contained in NP beyond the Standard Model
one, we find that only CP conserving neutral gauge couplings are generated,
either from the standard quarks and leptons, or from possible New Physics (NP)
fermions. Bosonic one-loop diagrams never contribute to these couplings, while
the aforementioned fermionic contributions satisfy hZ3=-fgamma5, hZ4=hgamma4=0.
We also study examples of two-loop NP effects that could generate non vanishing
h4 couplings. We compare quantitative estimates from SM, MSSM and some specific
examples of NP contributions, and we discuss their observability at future
colliders.


title:
Axial vector current in an electromagnetic field and low-energy
  neutrino-photon interactions

abstract:
  An expression for the axial vector current in a strong, slowly varying
electromagnetic field is obtained. We apply this expression to the construction
of the effective action for low-energy neutrino-photon interactions.


title: The (in)stability of global monopoles revisited

abstract:
  We analyse the stability of global O(3) monopoles in the infinite cut-off (or
scalar mass) limit. We obtain the perturbation equations and prove that the
spherically symmetric solution is classically stable (or neutrally stable) to
axially symmetric square integrable or power-law decay perturbations. Moreover
we show that, in spite of the existence of a conserved topological charge, the
energy barrier between the monopole and the vacuum is finite even in the limit
where the cut-off is taken to infinity. This feature is specific of global
monopoles and independent of the details of the scalar potential.


title:
The structure function of semi-inclusive heavy flavour decays in field
  theory

abstract:
  We consider the decay of a heavy flavour into an inclusive hadronic state X
of invariant mass m_X small with respect to its energy E_X, m_X << E_X. The
electron spectrum and the hadronic mass distribution in semileptonic b -> u
decays, or the photon spectrum in b -> s gamma decays, all require, close to
their endpoints, a control over this region. This region is affected both by
non-perturbative phenomena related to the Fermi motion of the heavy quark and
by perturbative soft gluon radiation in the final state (Sudakov form
factor).Fermi motion can be described by the shape function f (m*), which
represents the distribution of the effective mass m* of the heavy quark at
disintegration time. We perform a factorization with a simple technique in
order to consistently separate perturbative from non-perturbative effects. We
find that the shape function, contrary to naive expectations,is not a physical
distribution, as it is affected by substantial regularization scheme effects,
controlling even the leading, double-logarithmic term. It factorizes, however,
the bulk of non-perturbative effects in lattice-like regularizations. Some
non-perturbative effects are present in the coefficient function even at
leading twist, but they are expected to be suppressed on physical grounds.
Finally, we clarify a controversial factor of 2 in the evolution kernel of the
shape function.


title: Quark-Gluon Plasma: Status of Heavy Ion Physics

abstract:
  Lattice quantum chromodynamics (QCD), defined on a discrete space time
lattice, leads to a spectacular non-perturbative prediction of a new state of
matter, called quark-gluon plasma (QGP), at sufficiently high temperatures or
equivalently large energy densities. The experimental programs of CERN, Geneva
and BNL, New York of relativistic heavy ion collisions are expected to produce
such energy densities, thereby providing us a chance to test the above
prediction. After a brief introduction of the necessary theoretical concepts, I
will present a critical review of the experimental results already obtained by
the various experiments in order to examine whether QGP has already been
observed by them.


title: Gluon Fragmentation to Gluonium

abstract:
  The fragmentation of gluons to gluonium states is analyzed qualitatively in
the non-perturbative region. The convolution of this mechanism with
perturbative gluon radiation leaves us with a hard component in the
fragmentation of gluon to gluonium.


title:
Neutrino oscillation experiments and limits on lepton-number and
  lepton-flavor violating processes

abstract:
  Using a three neutrino framework we investigate bounds for the effective
Majorana neutrino mass matrix. The mass measured in neutrinoless double beta
decay is its (11) element. Lepton-number and -flavor violating processes
sensitive to each element are considered and limits on branching ratios or
cross sections are given. Those processes include $\mu^- e^+$ conversion, $K^+
\to \pi^- \mu^+ \mu^+$ or recently proposed high-energy scattering processes at
HERA. Including all possible mass schemes, the three solar solutions and other
allowed possibilities, there is a total of 80 mass matrices. The obtained
indirect limits are up to 14 orders of magnitude more stringent than direct
ones. It is investigated how neutrinoless double beta decay may judge between
different mass and mixing schemes as well as solar solutions. Prospects for
detecting processes depending on elements of the mass matrix are also
discussed.


title:
Random matrix model for chiral symmetry breaking and color
  superconductivity in QCD at finite density

abstract:
  We consider a random matrix model which describes the competition between
chiral symmetry breaking and the formation of quark Cooper pairs in QCD at
finite density. We study the evolution of the phase structure in temperature
and chemical potential with variations of the strength of the interaction in
the quark-quark channel and demonstrate that the phase diagram can realize a
total of six different topologies. A vector interaction representing
single-gluon exchange reproduces a topology commonly encountered in previous
QCD models, in which a low-density chiral broken phase is separated from a
high-density diquark phase by a first-order line. The other five topologies
either do not possess a diquark phase or display a new phase and new critical
points. Since these five cases require large variations of the coupling
constants away from the values expected for a vector interaction, we conclude
that the phase diagram of finite density QCD has the topology suggested by
single-gluon exchange and that this topology is robust.


title: Light Hybrid Mesons in QCD

abstract:
  Including the radiative perturbative corrections and the short distance
tachyonic gluon mass effects which mimic the ones of UV renormalons, we
re-estimate the decay amplitudes, masses and widths of light hybrid mesons from
QCD spectral sum rules. We show that the effects are tiny and confirm the
previous lowest order results. We discuss the phenomenological impacts of our
results for the vector hybrids.


title: Photons, neutrinos and large compact space dimensions

abstract:
  We compute the contribution of Kaluza-Klein graviton exchange to the cross
section for photon-neutrino scattering. Unlike the usual situation where the
virtual graviton exchange represents a small correction to a leading order
electroweak or strong amplitude, in this case the graviton contribution is of
the same order as the electroweak amplitude, or somewhat larger. Inclusion of
the graviton contribution is not sufficient to allow high energy neutrinos to
scatter from relic neutrinos in processes such as
$\nu\bar{\nu}\to\gamma\gamma$, but the photon-neutrino decoupling temperature
is substantially reduced.


title:
From Black Holes to Pomeron: Tensor Glueball and Pomeron Intercept at
  Strong Coupling

abstract:
  We briefly review the approach for strong coupling calculation of glueball
masses based on the duality between supergravity and Yang-Mills theory. Earlier
work is extended to non-zero spin. Fluctuations in the gravitational metric
lead to the $2^{++}$ tensor glueball state on the leading Pomeron trajectory
with a mass relation: $m(0^{++}) < m(2^{++}) $. In particular, for $QCD_4$, a
strong coupling expansion for the Pomeron intercept is obtained.


title: Report of the SUGRA Working Group for Run II of the Tevatron

abstract:
  We present an analysis of the discovery reach for supersymmetric particles at
the upgraded Tevatron collider, assuming that SUSY breaking results in
universal soft breaking parameters at the grand unification scale, and that the
lightest supersymmetric particle is stable and neutral. We first present a
review of the literature, including the issues of unification, renormalization
group evolution of the supersymmetry breaking parameters and the effect of
radiative corrections on the effective low energy couplings and masses of the
theory. We consider the experimental bounds coming from direct searches and
those arising indirectly from precision data, cosmology and the requirement of
vacuum stability. The issues of flavor and CP-violation are also addressed. The
main subject of this study is to update sparticle production cross sections,
make improved estimates of backgrounds, delineate the discovery reach in the
supergravity framework, and examine how this might vary when assumptions about
universality of soft breaking parameters are relaxed. With 30 fb$^{-1}$
luminosity and one detector, charginos and neutralinos, as well as third
generation squarks, can be seen if their masses are not larger than 200-250
GeV, while first and second generation squarks and gluinos can be discovered if
their masses do not significantly exceed 400 GeV. We conclude that there are
important and exciting physics opportunities at the Tevatron collider, which
will be significantly enhanced by continued Tevatron operation beyond the first
phase of Run II.


title: New Physics Search in B Meson Decays

abstract:
  We discuss new physics search within the minimal supergravity model by using
a possible large direct CP asymmetry in $B^{\pm} \to K^{\pm}\phi,
K^{0}\pi^{\pm}$ decays and B meson rare decays.


title:
Measuring $F_L(x,Q^2)/F_2(x,Q^2)$ from Azimuthal Asymmetries in Deep
  Inelastic Scattering

abstract:
  We demonstrate that the angular distribution of hadrons produced in
semi-inclusive deep inelastic final states is related to the inclusive
longitudinal structure function. This relation could provide a new method of
accessing $F_L(x,Q^2)$ in deep inelastic scattering measurements.


title:
From Constituent Quark to Hadron Structure in the Next-to-Leading Order:
  Nucleon and Pion

abstract:
  We calculate the partonic structure of constituent quark in the
Next-to-Leading Order for the first time. The structure of any hadron can be
obtained thereafter using a convolution method. Such a procedure is used to
generate the structure function of proton and pion in NLO. It is shown that
while the constituent quark structure is generated purely perturbatively and
accounts to most part of the hadronic structure, there is a few percent
contributions coming from the nonperturbative sector in the hadronic structure.
This contribution plays the key role in explaining the SU(2) symmetry breaking
of the nucleon sea and the observed violation of Gottfried sum rule. These
effects are calculated. Excellent agreement with data in a wide range of
$x=[10^{-6}, 1]$ and $Q^{2}=[0.5, 5000]$ $GeV^{2}$ is reached for proton
structure function. We have also calculated Pion structure and compared it with
the existing data. Again nice agreement is achieved.


title:
Positive strangeness contribution to the nucleon magnetic moment in a
  relativistic chiral potential model

abstract:
  The strangeness contribution to the nucleon magnetic moment is calculated at
the one-loop level in a relativistic SU(3) chiral potential model and is found
to be {\em positive}, that is, with an {\em opposite} sign to the nucleon
strangeness polarization. It is the ``Z'' diagram that violates the usual
relation between spin and magnetic moment. The positive value is due to the
contribution from the intermediate excited quark states, while the intermediate
ground state gives a negative contribution. Our numerical results agree quite
well with the new measurement of the SAMPLE Collaboration.


title:
Supersymmetric Electroweak Corrections to Charged Higgs Boson Production
  in Association with a Top Quark at Hadron Colliders

abstract:
  We calculate the $O(\alpha_{ew}m_{t(b)}^{2}/m_{W}^{2})$ and $O(\alpha_{ew}
m_{t(b)}^4/m_W^4)$ supersymmetric electroweak corrections to the cross section
for the charged Higgs boson production in association with a top quark at the
Tevatron and the LHC. These corrections arise from the quantum effects which
are induced by potentially large Yukawa couplings from the Higgs sector and the
chargino-top(bottom)-sbottom(stop) couplings,
neutralino-top(bottom)-stop(sbottom) couplings and charged Higgs-stop-sbottom
couplings. They can decrease or increase the cross section depending on
$\tan\beta$ but are not very sensitive to the mass of the charged Higgs boson
for high $\tan\beta$. At low $\tan\beta(=2)$ the corrections decrease the total
cross sections significantly, which exceed -12% for $m_{H^{\pm}}$ below
$300GeV$ at both the Tevatron and the LHC, but for $m_{H^{\pm}}>300GeV$ the
corrections can become very small at the LHC. For high $\tan\beta(=10,30)$
these corrections can decrease or increase the total cross sections, and the
magnitude of the corrections are at most a few percent at both the Tevatron and
the LHC.


title: New limits on effective Majorana neutrino masses from rare kaon decays

abstract:
  The rare kaon decay $K^+ \ra \pi^- \mu^+ \mu^+$ is violating lepton number by
two units and is investigated within the context of Majorana neutrino masses.
Using a new upper bound for this decay from E865 an upper limit on the
effective Majorana mass term $\m_{\mu \mu} < 500$ GeV could be obtained. This
is improving existing bounds by about one order of magnitude. Implications on
heavy neutrinos are discusse d as well as future possibilities to improve
limits on this as well as other elements of the Majorana m ass matrix are
investigated.


title: Perspectives on Finding the Neutrino Nature

abstract:
  The possibility of determining the neutrino nature is considered in view of
the most recent experimental observations. The analysis combines schemes with
three and four neutrinos.The data on oscillations is put together with that
from the search of neutrinoless double beta decay and results on tritium beta
decay. All solar neutrino oscillation solutions are taken into account. The
sensitivity of the problem on future experimental bounds from GENIUS is
studied. Dirac neutrinos are shown to be unavoidable already at present in some
schemes and the constraints will quickly become more stringent with future
data. The consequences of including bounds from Cosmology on the neutrino
content of Hot Dark Matter are commented.


title: Infra-red fixed points in supersymmetry

abstract:
  Model independent constraints on supersymmetric models emerge when certain
couplings are drawn towards their infra-red (quasi) fixed points in the course
of their renormalization group evolution. The general principles are first
reviewed and the conclusions for some recent studies of theories with R-parity
and baryon and lepton number violations are summarized.


title:
Solar Neutrino Rates, Spectrum, and its Moments : an MSW Analysis in the
  Light of Super-Kamiokande Results

abstract:
  We re-examine MSW solutions of the solar neutrino problem in a two flavor
scenario taking (a) the results on total rates and the electron energy spectrum
from the 1117-day SuperKamiokande (SK) data and (b) those on total rates from
the Chlorine and Gallium experiments. We find that the SMA solution gives the
best fit to the total rates data from the different experiments. One new
feature of our analysis is the use of the moments of the SK electron spectrum
in a $\chi^2$ analysis. The best-fit to the moments is broadly in agreement
with that obtained from a direct fit to the spectrum data and prefers a $\Delta
m^2$ comparable to the SMA fit to the rates but the required mixing angle is
larger. In the combined rate and spectrum analysis, apart from varying the
normalization of the $^8$B flux as a free parameter and determining its
best-fit value we also obtain the best-fit parameters when correlations between
the rates and the spectrum data are included and the normalization of the $^8$B
flux held fixed at its SSM value. We observe that the correlations between the
rates and spectrum data are important and the goodness of fit worsens when
these are included. In either case, the best-fit lies in the LMA region.


title: Vacuum Energy: "If Not Now, Then When?"

abstract:
  For a flat universe presently dominated by static or dynamic vacuum energy,
cosmological constant (LCDM) or quintessence (QCDM), we calculate the
asymptotic collapsed mass fraction as function of the present ratio of smooth
energy to matter energy $\rat=(1-\omm)/\omm$. Identifying these collapsed
fractions as anthropic probabilities, we find the observed present ratio $\rat
\sim 2$ to be likely in LCDM, but most likely in QCDM.


title:
Determination of the strange quark mass from Cabibbo-suppressed tau
  decays with resummed perturbation theory in an effective scheme

abstract:
  We present an analysis of the m_s^2-corrections to Cabibbo-suppressed tau
lepton decays employing contour improved resummation within an effective scheme
which is an essential new feature as compared to previous analyses. The whole
perturbative QCD dynamics of the tau-system is described by the beta-function
of the effective coupling constant and by two gamma-functions for the effective
mass parameters of the strange quark in different spin channels. We analyze the
stability of our results with regard to high-order terms in the perturbative
expansion of the renormalization group functions. A numerical value for the
strange quark mass in the MS scheme is extracted m_s(M_\tau)=130\pm 27_{exp}\pm
9_{th} MeV. After running to the scale 1 GeV this translates into m_s(1
GeV)=176 \pm 37_{exp}\pm 13_{th} MeV.


title:
Baryon Number Asymmetry Induced by Coherent Motions of a Cosmological
  Axion-Like Pseudoscalar

abstract:
  A cosmological pseudoscalar field coupled to hypercharge topological number
density can exponentially amplify hyperelectric and hypermagnetic fields in the
symmetric phase of the electroweak plasma while coherently rolling or
oscillating, leading to the formation of a condensate of topological number
density. The topological number can be converted, under certain conditions,
into baryon number in sufficient amount to explain the observed baryon
asymmetry of the universe. We focus on a singlet elementary hypercharge axion
(HCA) whose only coupling to standard model fields is to hypercharge
topological number density. This model has two parameters: the mass $m$ and
decay constant $M$ of the HCA. We describe this new mechanism for baryogenesis
and outline the region of the parameter space in which the mechanism is
efficient. We show that present colliders can already put interesting
constraints on both parameters, and that future colliders will improve the
detection capabilities very significatively.


title: Large N_c, Constituent Quarks, and N, Delta Charge Radii

abstract:
  We show how one may define baryon constituent quarks in a rigorous manner,
given physical assumptions that hold in the large-N_c limit of QCD. This
constituent picture gives rise to an operator expansion that has been used to
study large-N_c baryon observables; here we apply it to the case of charge
radii of the N and Delta states, using minimal dynamical assumptions. For
example, one finds the relation r_p^2 - r_{Delta^+}^2 = r_n^2 - r_{Delta^0}^2
to be broken only by three-body, O(1/N_c^2) effects for any N_c.


title: Charged Particle Ratio Fluctuation as a Signal for QGP

abstract:
  In this letter we argue that the event-by-event fluctuations of the ratio of
the positively charged and the negatively charged pions provides a signal of
quark-gluon plasma. The fact that quarks carry fractional charges is ultimately
responsible for this distinct signal.


title: Fluctuation Probes of Quark Deconfinement

abstract:
  The size of the average fluctuations of net baryon number and electric charge
in a finite volume of hadronic matter differs widely between the confined and
deconfined phases. These differences may be exploited as indicators of the
formation of a quark-gluon plasma in relativistic heavy-ion collisions, because
fluctuations created in the initial state survive until freeze-out due to the
rapid expansion of the hot fireball.


title: The Higgs Mass and New Physics Scales in the Minimal Standard Model

abstract:
  We study the theoretical correlation between the Higgs mass of the minimal
standard model and the scale at which new physics is expected to occur. In
addition to the classic constraints of unitarity, triviality and vacuum
stability, we reexamine the constraints imposed by the precision electroweak
data. We then pay particular attention to the constraint imposed by the absence
of fine-tuning in the Higgs mass parameter (the Veltman condition). We find
that the fine-tuning condition places a significant constraint on the new
physics scale for the Higgs mass range 100 GeV < m_h < 200 GeV mostly
unconstrained by the classic constraints.


title:
Quantum Field Theory Solution to The Gauge Hierarchy And Cosmological
  Constant Problems

abstract:
  A quantum field theory formalism is reviewed that leads to a self-consistent,
finite quantum gravity, Yang-Mills and Higgs theory, which is unitary and gauge
invariant to all orders of perturbation theory. The gauge hierarchy problem is
solved due to the exponential damping of the Higgs self-energy loop graph for
energies greater than a scale $\Lambda_H\leq 1$ TeV. The cosmological constant
problem is solved by introducing a fundamental quantum gravity scale,
$\Lambda_G\leq 10^{-4}$ eV, above which the virtual contributions to the vacuum
energy density coupled to gravity are exponentially suppressed, 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. Possible
experimental tests of the onset of quantum nonlocality at short distances are
considered.


title:
Parametric Amplification of Metric Fluctuations During Reheating in Two
  Field Models

abstract:
  We study the parametric amplification of super-Hubble-scale scalar metric
fluctuations at the end of inflation in some specific two-field models of
inflation, a class of which is motivated by hybrid inflation. We demonstrate
that there can indeed be a large growth of fluctuations due to parametric
resonance and that this effect is not taken into account by the conventional
theory of isocurvature perturbations. Scalar field interactions play a crucial
role in this analysis. We discuss the conditions under which there can be
nontrivial parametric resonance effects on large scales.


title: Brane Cosmologies without Orbifolds

abstract:
  We study the dynamics of branes in configurations where 1) the brane is the
edge of a single anti-de Sitter (AdS) space and 2) the brane is the surface of
a vacuum bubble expanding into a Schwarzschild or AdS-Schwarzschild bulk. In
both cases we find solutions that resemble the standard Robertson-Walker
cosmologies although in the latter, the evolution can be controlled by a mass
parameter in the bulk metric. We also include a term in the brane action for
the scalar curvature. This term adds a contribution to the low energy theory of
gravity which does not need to affect the cosmology but which is necessary for
the surface of the vacuum bubble to recover four dimensional gravity.


title:
Are Messages of R-parity Violating Supersymmetry Hidden within Top Quark
  Signals ?

abstract:
  In an R-parity nonconserving supersymmetric theory, the lighter stop can
dominantly decay into $b\mu$ and $b\tau$ if R-parity breaking has to explain
the neutrino mass and mixing pattern suggested by the data on atmospheric muon
neutrinos. This should give rise to $dilepton+dijet$ and $single-lepton+jets$,
signals resembling those of the top quark at the Fermilab Tevatron. One can
thus constrain the stop parameter space using the current top search data, and
similarly look for the first signals of supersymmetry at the upgraded runs of
the Tevatron.


title: Probing flavor changing interactions in hadron collisions

abstract:
  The subprocess $gg \to t\bar{c}+\bar{t}c$ in the two-Higgs-doublet model with
flavor-changing scalar couplings is examined at the one loop level. With
perturbative QCD factorization theorem, the corresponding cross sections for
hadron-hadron collisions are computed numerically. The results are applicable
to the whole mass range of the weakly coupled Higgs bosons. In case we could
efficiently exclude the severe backgrounds of the $t\bar{c}(\bar{t}c)$
production signal, probing the flavor-changing top-charm-scalar vertex at
hadron colliders would be very promising and accessible experimentally.


title: Does the quark-gluon plasma contain stable hadronic bubbles?

abstract:
  We calculate the thermodynamic potential of bubbles of hadrons embedded in
quark-gluon plasma, and of droplets of quark-gluon plasma embedded in hadron
phase. This is a generalization of our previous results to the case of non-zero
chemical potentials. As in the zero chemical potential case, we find that a
quark-gluon plasma in thermodynamic equilibrium may contain stable bubbles of
hadrons of radius $R \simeq 1$ fm. The calculations are performed within the
MIT Bag model, using an improved multiple reflection expansion. The results are
of relevance for neutron star phenomenology and for ultrarelativistic heavy ion
collisions.


title:
Fragmentation Functions from Flavour-inclusive and Flavour-tagged e^+e^-
  Annihilations

abstract:
  Fitting $Z^0$-pole data from ALEPH and SLD, and TPC data at a lower c.m.s.\
energy, we fix the boundary condition for NLO parton$\to$hadron
(hadron$=\pi^\pm, K^\pm, \sum_h h^\pm$) fragmentation functions (FFs) at the
low resolution scale of the radiative parton model of Gl\"{u}ck, Reya and Vogt
(GRV). Perturbative LO$\leftrightarrow$NLO stability is investigated. The
emphasis of the fit is on information on the fragmentation process for
individual light ($u,d,s$) and heavy ($c,b$) quark flavours where we comment on
the factorization scheme for heavy quarks in $e^+e^-$ annihilations as compared
to deep inelastic production. Inasmuch as the light quark input parameters are
not yet completely pinned down by measurements we assume power laws to
implement a physical hierarchy among the FFs respecting valence enhancement and
strangeness suppression both of which are manifest from recent leading particle
measurements. Through the second Mellin moments of the input functions we
discuss the energy-momentum sum rule for massless FFs. We discuss our results
in comparison to previous fits and recent 3-jet measurements and formulate
present uncertainties in our knowledge of the individual FFs.


title:
The Wh decay channel as a probe of charged Higgs boson production at the
  Large Hadron Collider

abstract:
  We analyse the chances of detecting charged Higgs bosons of the Minimal
Supersymmetric Standard Model (MSSM) at the Large Hadron Collider (LHC) in the
$W^\pm h$ mode, followed by the dominant decay of the lightest Higgs scalar,
$h\to b\bar b$. If the actual value of $M_h$ is already known, this channel
offers possibly the optimal final state kinematics for charged Higgs discovery,
thanks to the narrow resonances appearing around the $W^\pm$ and $h$ masses.
Besides, within the MSSM, the $H^\pm\to W^\pm h$ decay rate is significant for
not too large $\tan\beta$ values, thus offering the possibility of accessing a
region of MSSM parameter space left uncovered by other search channels. We
consider both strong (QCD) and electroweak (EW) `irreducible' backgrounds in
the $3b$-tagged channel to the $gg\to t\bar bH^-$ production process that had
not been taken into account in previous analyses. After a series of kinematic
cuts, the largest of these processes is $t\bar bW^\pm h$ production in the
continuum. However, for optimum $\tan\beta$, i.e., between 2 and 3, the charged
Higgs boson signal overcomes this background and a narrow discovery region
survives around $M_{H^\pm}\approx200$ GeV


title:
Perturbative and non-perturbative aspects of moments of the thrust
  distribution in e+e- annihilation

abstract:
  Resummation and power-corrections play a crucial role in the phenomenology of
event-shape variables like the thrust T. Previous investigations showed that
the perturbative contribution to the average thrust is dominated by gluons of
small invariant mass, of the order of 10% of Q, where Q is the center-of-mass
energy. The effect of soft gluons is also important, leading to a
non-perturbative 1/Q correction. These conclusions are based on renormalon
analysis in the single dressed gluon (SDG) approximation. Here we analyze
higher moments of the thrust distribution using a similar technique. We find
that the characteristic gluon invariant mass contributing to <(1-T)^m>
increases with m. Yet, for m=2 this scale is quite low, around 27% of Q, and
therefore renormalon resummation is still very important. On the other hand,
the power-correction to <(1-T)^2> from a single soft gluon emission is found to
be highly suppressed: it scales as 1/Q^3. In practice, <(1-T)^2> and higher
moments depend also on soft gluon emission from configurations of three hard
partons, which may lead to alpha_s(Q^2)/Q power-corrections. This issue is yet
to be investigated.


title:
Renormalization-Group-Improved Effective Potential for the MSSM Higgs
  Sector with Explicit CP Violation

abstract:
  We perform a systematic study of the one-loop renormalization-group-improved
effective potential of the minimal supersymmetric extension of the Standard
Model (MSSM), including CP violation induced radiatively by soft trilinear
interactions related to squarks of the third generation. We calculate the
charged and neutral Higgs-boson masses and couplings, including the two-loop
logarithmic corrections that arise from QCD effects, as well as those
associated with the top- and bottom-quark Yukawa couplings. We also include the
potentially large two-loop non-logarithmic corrections induced by one-loop
threshold effects on the top- and bottom-quark Yukawa couplings, due to the
decoupling of the third-generation squarks. Within this minimal CP-violating
framework, the charged and neutral Higgs sectors become intimately related to
one another and therefore require a unified treatment. In the limit of a large
charged Higgs-boson mass, M_{H^+} >> M_Z, the lightest neutral Higgs boson
resembles that in the Standard Model (SM), and CP violation occurs only in the
heavy Higgs sector. Our analysis shows that sizeable radiative effects of CP
violation in the Higgs sector of the MSSM may lead to significant modifications
of previous studies for Higgs-boson searches at LEP2, the Tevatron and the LHC.
In particular, CP violation could enable a relatively light Higgs boson to
escape detection at LEP2.


title: Precision Electroweak Parameters and the Higgs Mass

abstract:
  The status of various precisely measured electroweak parameters is reviewed.
Natural relations among them are shown to constrain the Higgs mass, m_H, via
quantum loop effects to relatively low values. A comparison with direct Higgs
searches is made.


title:
Scattering of a particle with spin by atomic chain as null test of
  T-violating P-even magnetism

abstract:
  T-odd P-even long-range electromagnetic interaction of a particle of spin 1/2
with the nucleus is considered. Though matrix element of the interaction is
zero for the particles on mass shell, nevertheless, null test exists for the
interaction. The test consists in measuring of the spin-dependent T-odd P-even
forward elastic scattering amplitude of a particle of spin 1/2 by atomic chain
(axis) in a crystall.


title: QCD In Extreme Conditions

abstract:
  Recently we have made considerable progress in our understanding of the
behavior of QCD in extreme conditions of high temperature or large baryon
number density. Among the highlights are the prediction of a well-characterized
true critical point, and the discovery that the ground state of three-flavor
QCD at asymptotically high densities exhibits color-flavor locking. The
critical point occurs at the unique temperature and density where a sharp
distinction between an ionized plasma of quarks and gluons and the hadronic
phase first appears. It appears to be accessible both to numerical and to
laboratory experiments. Color-flavor locking provides a calculable,
weak-coupling realization of confinement and chiral symmetry breaking. It also
provides a microscopic realization of Han-Nambu charge assignments for quark
quasiparticles, and of Yang-Mills theory for the physical vector mesons. Here I
provide a self-contained introduction to these developments.

categories: hep-ph astro-ph cond-mat.stat-mech hep-lat hep-th nucl-th


title: Neutrino Oscillations at an Entry-Level Neutrino Factory and Beyond

abstract:
  We consider the parameters of an entry-level neutrino factory designed to
make the first observation of nu_e -> nu_mu oscillations, measure the
corresponding amplitude sin^2 2theta_{13}, and determine the sign of the
atmospheric-scale delta m_{32}^2 via matter effects. A 50 kt detector, a stored
muon energy E_mu geq 20 GeV and 10^{19} muon decays would enable these goals to
be met provided sin^2 2theta_{13} > 0.01. The determination of the sign of
delta m_{32}^2 also requires a baseline L geq 2000 km. An upgraded neutrino
factory with O(10^{20}) decays would enable the first observation of nu_e ->
nu_tau oscillations. With O(10^{21}) decays the effects of a large CP-phase
could be measured in the case of the large angle matter oscillation solution to
the solar neutrino anomaly. Our analysis includes a family of three-neutrino
models that can account for the atmospheric and solar neutrino oscillation
indications.


title: Color superconductivity in dense quark matter

abstract:
  I discuss recent developments in our understanding of the
color-superconducting phases of cold, dense quark matter. I describe the phase
diagram as a function of density and the strange quark mass, and outline some
ideas about possible observational consequences of these exotic phases.


title:
Gaugino Mass Nonuniversality and Dark Matter in SUGRA, Strings and D
  Brane Models

abstract:
  The effects of nonuniversality of gaugino masses on dark matter are examined
within supersymmetric grand unification, and in string and D brane models with
R parity invariance. In SU(5) unified models nonuniversality in the gaugino
sector can be generated via the gauge kinetic energy function which may depend
on the 24, 75 and 200 dimensional Higgs representations. We also consider
string models which allow for nonuniversality of gaugino masses and D brane
models where nonuniversality arises from embeddings of the Standard Model gauge
group on five branes and nine branes. It is found that with gaugino mass
nonuniversality the range of the LSP mass can be extended much beyond the range
allowed in the universal SUGRA case, up to about 600 GeV even without
coannihilation effects in some regions of the parameter space. The effects of
coannihilation are not considered and inclusion of these effects may further
increase the allowed neutralino mass range. Similarly with the inclusion of
gaugino mass nonuniversality, the neutralino-proton ($\chi -p$) cross-section
can increase by as much as a factor of 10 in some of regions of the parameter
space. An analysis of the uncertainties in the quark density content of the
nucleon is given and their effects on $\chi -p$ cross-section are discussed.
The predictions of our analysis including nonuniversality is compared with the
current limits from dark matter detectors and implications for future dark
matter searches are discussed.


title:
RG-invariant Sum Rule in a Generalization of Anomaly Mediated SUSY
  Breaking Models

abstract:
  We study a generalization of anomaly-mediated supersymmetry breaking (AMSB)
scenarios, under the assumption that the effects of the high-scale theory do
not completely decouple and D-term type contributions can be therefore present.
We investigate the effect of such possible D-term additional contributions to
soft scalar masses by requiring that, for non-vanishing, renormalizable Yukawa
couplings $Y^{ijk} $, the sum of squared soft supersymmetry breaking mass
parameters, $M^2_{ijk} \equiv m_i^2+m_j^2+m_k^2$, is RG-invariant, in the sense
that it becomes independent of the specific ultraviolet boundary conditions as
it occurs in the AMSB models. These type of models can avoid the problem of
tachyonic solutions for the slepton mass spectrum present in AMSB scenarios. We
implement the electroweak symmetry breaking condition and explore the sparticle
spectrum associated with this framework. To show the possible diversity of the
sparticle spectrum, we consider two examples, one in which the D-terms induce a
common soft supersymmetry breaking mass term for all sfermion masses, and
another one in which a light stop can be present in the spectrum.


title:
Lepton polarization and CP-violating effects in "B -> K^* tau^+ tau^-"
  decay in standard and two Higgs doublet models

abstract:
  The most general model independent expressions for the CP-violating
asymmetry, longitudinal, transversal and normal polarizations of leptons are
derived. Application of these general results to the concrete models such as
Standard model and three different types of two Higgs doublet model is
discussed.


title: Maximal $\nu_e$ oscillations, Borexino and smoking guns

abstract:
  We examine the maximal $\nu_e --> \nu_s$ and $\nu_e --> \nu_\mu,\tau$
oscillation solutions to the solar neutrino problem. These solutions lead to
roughly a 50% solar flux reduction for the large parameter range $3\times
10^{-10} < \delta m^2/eV^2 < 10^{-3}$. It is known that the earth regeneration
effect may cause a potentially large night-day asymmetry even for maximal
neutrino oscillations. We investigate the night-day asymmetry predictions for
the forthcoming Borexino measurement of the ^7Be neutrinos for both maximal
$\nu_e --> \nu_s$ and $\nu_e --> \nu_\mu,\tau$ oscillations. If $y \times
10^{-8} < \delta m^2/eV^2 < 4y \times 10^{-5}$ (with y = 0.5 for $\nu_e -->
\nu_s$ case and y = 1 for $\nu_e --> \nu_\mu,\tau$ case) then the maximal
neutrino oscillations will lead to observable night-day asymmetries in Borexino
and/or superKamiokande. With Kamland covering the high mass range, $10^{-5} <
\delta m^2/eV^2 < 10^{-3}$ and Borexino/superK covering the low mass range,
$3\times 10^{-10} < \delta m^2/eV^2 < 5\times 10^{-9}$ ("just so" region),
essentially all of the $\delta m^2$ parameter space will soon be scrutinized.


title: Baryogenesis from `electrogenesis' in a scalar field dominated epoch

abstract:
  Scalar fields can play a dominant role in the dynamics of the Universe until
shortly before nucleosynthesis. Examples are provided by domination by a
kinetic mode of a scalar field, which may be both the inflaton and the late
time `quintessence', and also by more conventional models of reheating. The
resultant modification to the pre-nucleosynthesis expansion rate can allow
solely an asymmetry in right handed electrons to produce a net baryon asymmetry
when reprocessed by the anomalous B+L violating processes of the standard
model. The production of such a source asymmetry - what we term
`electrogenesis' - requires no additional B or L violation beyond that in the
standard model. We consider a specific model for its generation, by a simple
perturbative out of equilibrium decay of Higgs like scalar fields with
CP-violating Yukawa couplings to the standard model leptons. We show that,
because of the much enhanced expansion rate, such a mechanism can easily
produce an adequate asymmetry from scalars with masses as low as 1 TeV. Kinetic
mode domination is strongly favoured because it evades large entropy release
which dilutes the asymmetry. We also discuss briefly the effect of the abelian
hypercharge anomaly.


title: Signatures of the Induced $\Theta$ vacuum state in Heavy Ion Collisions

abstract:
  It was argued recently that, in general, an arbitrary induced theta vacuum
state would be created in the heavy ion collisions, similar to the creation of
the disoriented chiral condensatewith an arbitrary isospin direction. It should
be a large domain with a wrong theta orientation which will mimic the physics
of the world when the fundamental theta is non-zero. I suggest a few simple
observables which can (hopefully) be measured on an event by event basis at
RHIC, and which uniquely determine whether the induced theta vacuum state is
created.


title: Constraints on $m_s$ and $\epsilon'/\epsilon$ from Lattice QCD

abstract:
  Results for light quark masses obtained from lattice QCD simulations are
compared and contrasted with other determinations. Relevance of these results
to estimates of $\epsilon'/\epsilon$ is discussed.


title: Parton densities for heavy quarks

abstract: We compare parton densities for heavy quarks.


title: A consistent interpretation of the Karmen anomaly

abstract:
  The Karmen anomaly can be interpreted as being due to a heavy neutrino of
mass around 137 MeV produced in $\pi_{e 2}$ decays. This interpretation is
consistent with the present limits on the couplings of such an object.


title: Pomeron intercepts at colliders

abstract:
  A method allowing for a direct comparison of data with theoretical
predictions is proposed for forward jet production at HERA and Mueller-Navelet
jets at Tevatron and LHC. An application to the determination of the effective
Pomeron intercept in the BFKL-LO parametrization from d sigma/dx data at HERA
leads to a good fit with a significantly higher effective intercept, $\alpha_P=
1.43 \pm 0.025 (stat.) \pm 0.025 (syst.),$ than for proton (total and
diffractive) structure functions. It is however less than the value of the
pomeron intercept using dijets with large rapidity intervals obtained at
Tevatron. We also evaluate the rapidity veto contribution to the higher order
BFKL corrections. We suggest to measure the dependence of the dijet
cross-sections as a function of the jet transverse energies as a signal for
BFKL pomeron at LHC.


title:
Two-Loop Contribution to High Mass Dilepton Production by Quark-Gluon
  Plasma

abstract:
  We calculate the order \alpha_s finite temperature correction to dilepton
production in quark-gluon plasma arising from the two-loop photon self-energy
diagrams for high invariant mass M >> T.


title: Proposal for a Constant Cosmological Constant

abstract:
  It is proposed that the apparent positive acceleration of the cosmological
scale factor is due to the vacuum energy of an incomplete chiral phase
transition in a hidden SU(2) sector. Constraints from primordial
nucleosynthesis imply that the present metastable phase is in a substantially
supercooled state. It is argued that massless chiral condensates can
substantially enhance the possibility of supercooling, and a linear sigma model
exhibiting scale invariance broken only at the quantum level is shown to
accommodate the required supercooling with a reasonable choice of quartic
couplings. The extensive supercooling can in principle be confirmed or rejected
on the basis of interface tension measurements in lattice simulations with
dynamical fermions.


title: Implications of Supersymmetry Phases for Higgs Boson Signals and Limits

abstract:
  We study the supersymmetry parameter region excluded if no Higgs is found at
LEP, and the region allowed if a Higgs boson is found at LEP. We describe the
full seven parameter structure of Higgs sector. When supersymmetry phases are
included, $\tan \beta$ greater than or equal to 2 is always allowed, and the
lower limit on lightest Higgs mass if no signal is found is about 20% lower
than in the Standard Model and about 10% lower than in the MSSM with phases set
to 0, $\pi$


title:
Non-Fermi Liquid Behaviour, the BRST Identity in the Dense Quark-Gluon
  Plasma and Color Superconductivity

abstract:
  At sufficiently high baryon densities, the physics of a dense quark-gluon
plasma may be investigated through the tools of perturbative QCD. This approach
has recently been successfully applied to the study of color superconductivity,
where the dominant di-quark pairing interaction arises from one gluon exchange.
Screening in the plasma leads to novel behaviour, including a remarkable
non-BCS scaling of T_C, the transition temperature to the color superconducting
phase. Radiative corrections to one gluon exchange were previously considered
and found to affect T_C. In particular, the quark self-energy in a plasma leads
to non-Fermi liquid behaviour and suppresses T_C. However, at the same time,
the quark-gluon vertex was shown not to modify the result at leading order.
This dichotomy between the effects of the radiative corrections at first
appears rather surprising, as the BRST identity connects the self-energy to the
vertex corrections. Nevertheless, as we demonstrate, there is in fact no
contradiction with the BRST identity, at least to leading log order. This
clarifies some of the previous statements on the importance of the higher order
corrections to the determination of T_C and the zero temperature gap in color
superconductivity.


title:
Scalar Mesons and Glueballs in a Chiral U(3)xU(3) Quark Model with 't
  Hooft Interaction

abstract:
  In a U(3)x U(3) quark chiral model of the Nambu-Jona-Lasinio type with the 't
Hooft interaction, the ground scalar isoscalar mesons and a scalar glueball are
described. The glueball (dilaton) is introduced into the effective meson
Lagrangian written in a chirally symmetric form on the base of scale
invariance. The singlet-octet mixing of scalar isoscalar mesons and their
mixing with the glueball are taken into account. Mass spectra of the scalar
mesons and glueball and their strong decays are described.


title: Quantum fluctuations of the quark condensate

abstract:
  The quantum fluctuations of the quark condensate are studied in a Nambu
Jona-Lasinio model. Two Lorenz invariant regularizations are considered: a
sharp 4-momentum cut-off and a soft gaussian regulator. The quantum
fluctuations of the quark condensate are found to be large although chiral
symmetry is not restored. Instabilities of the ground state appear when the
system is probed by a source term proportional to the squared quark condensate.
The instabilities are traced to unphysical poles introduced by the regulator
and their effect is greatly enhanced when a sharp cut-off is used.


title:
Radiative correction of the correlator for (0^{++},1$^{-+}$) light
  hybrid

abstract:
  We calculate the radiative corrections to the current-current correlator of
the hybrid current $g\bar q(x)\gamma_{\nu}iG_{\mu\nu}^aT^aq(x)$. Based on this
new result we use the QCD sum rule approach to estimate lower bounds on the
masses of the $J^{PC}$=$1^{-+}$ and $0^{++}$ light hybrids.


title: On the gauge invariance of the DVCS amplitude

abstract:
  We analyze in detail the problem of gauge invariance of the deeply vitual
Compton scattering (DVCS) amplitude. Using twist 3 one-gluon exchange diagram
contributions and the QCD equations of motion, we derive the general gauge
invariant expression of the DVCS amplitude on a (pseudo)scalar particle (pion,
$He^4$). Similarly to the case of deep inelastic scattering, the amplitude does
not depend on the twist-3 quark-gluon correlations at the Born level. The
contribution of the derived amplitude to the single-spin asymmetry with
longitudinally polarized lepton is calculated.


title: Polarized Photoproduction of Heavy Quarks in Next-to-Leading Order

abstract:
  The results of a next-to-leading order calculation of heavy quark production
in longitudinally polarized photon-nucleon collisions are presented. At c.m.
energy $\sqrt{S}=10$ GeV, for $\vec \gamma +\vec p \to c+X$, cross sections
differential in the transverse momentum and rapidity of the charmed quark $c$
and the corresponding asymmetries are presented; also, as functions of
$\sqrt{S}$, integrated cross sections, $K$-factors and the corresponding
asymmetries are given. Errors in the asymmetries are estimated and the
possibility to distinguish between three scerarios differing essentially in the
polarized gluon distribution is discussed.


title: Mass bound of the lightest neutral Higgs scalar in the extra U(1) models

abstract:
  The upper mass bound of the lightest neutral Higgs scalar is studied in the
$\mu$ problem solvable extra U(1) models by using the analysis of the
renormalization group equations. In order to restrict the parameter space we
take account of a condition of the radiative symmetry breaking and some
phenomenological constraints. We compare the bound obtained based on this
restricted parameter space with the one of the next to the minimal
supersymmetric standard model (NMSSM). Features of the scalar potential and
renormalization group equations of the Yukawa couplings among Higgs chiral
supermultiplets are rather different between them. They can reflect in this
bound.


title: Radiative symmetry breaking and Higgs mass bound in the NMSSM

abstract:
  We study the upper mass bound of the lightest neutral Higgs scalar in the
NMSSM using the RGE analysis. We require the successful occurence of the
electroweak radiative symmetry breaking to restrict the parameter space. As a
result the upper mass bound $m_{h^0}$ is largely restricted compared with the
one estimated without imposing this condition. We point out some features of
$m_{h^0}$ related to the initial value of $h_t$ and discuss why the models with
more extra matters ${\bf 5}+\bar{\bf 5}$ of SU(5) could bring the larger
maximum value of $m_{h^0}$.


title: "+-+" Brane Model Phenomenology

abstract:
  We explore the phenomenology of the recently proposed "+-+" brane model which
has a characteristic anomalously light first Kaluza-Klein mode. We consider the
processes e^+ e^- to mu^+ mu^- and the Kaluza-Klein production e^+ e^- to gamma
KK giving missing visible energy. These in combination with the latest
Cavendish experiments place severe bounds on the parameter space of the model.
We also discuss how forthcoming experiments can test the model for ``natural''
range of the parameters.


title: Phenomenological Survey of a Minimal Superstring Standard Model

abstract:
  We discuss a heterotic-string solution in which the observable sector
effective field theory just below the string scale reduces to that of the MSSM,
with the standard observable gauge group being just SU(3)_C x SU(2)_L x U(1)_Y
and the SU(3)_C x SU(2)_L x U(1)_Y-charged spectrum of the observable sector
consisting solely of the MSSM spectrum. Associated with this model is a set of
distinct flat directions of vacuum expectation values (VEVs) of fields that all
produce solely the MSSM spectrum. Some of these directions only involve VEVs of
non-Abelian singlet fields while others also contain VEVs of non-Abelian
charged fields.


title: Magnetic moment of $\Delta^{++}$ baryon in QCD string approach

abstract:
  Magnetic moment of the $\Delta^{++}$ baryon is computed within the new
approach based on the QCD string Hamiltonian.
  The string tension $\sigma$ is only dimensionful quantity forming magnetic
moments of both nucleon and $\Delta$, but color Coulomb and spin-spin
interactions cancel each other in the nucleon case while in $\Delta$ they add
coherently. The result $\mu_{\Delta} = 4.36\mu_N$ is in good agreement with
experimental data.


title: Determining the Flavour Content of the Low-Energy Solar Neutrino Flux

abstract:
  We study the sensitivity of the HELLAZ and Borexino solar neutrino
experiments on discriminating the neutrino species nu_e, anti-nu_e,
nu_{mu,tau}, anti-nu_{mu,tau}, and nu_{sterile} using the difference in the
recoil electron kinetic energy spectra in elastic neutrino-electron scattering.
We find that one can observe a non-vanishing nu_{mu,tau} component in the solar
neutrino flux, especially when the nu_e survival probability is low. Also, if
the data turn out to be consistent with nu_e <-> nu_{mu,tau} oscillations, an
anti-nu_e component can be excluded effectively.


title: Lepton Pair Production at the LHC and the Gluon Density in the Proton

abstract:
  The hadroproduction of lepton pairs with mass $Q$ and finite transverse
momentum $Q_T$ is dominated by quark-gluon scattering in the region $Q_T >
Q/2$. This feature provides a new independent method for constraining the gluon
density with data at hadron collider energies. Predictions are provided at the
energy of the LHC.


title: Neutrino Masses and Mixing at the Millennium

abstract:
  Recent evidence for neutrino oscillations has revolutionized the study of
neutrino masses and mixing. This report gives an overview of what we are
learning from the neutrino oscillation experiments, the prospects for the near
term, and the bright future of neutrino mass studies.


title: Photoproduction of Vector Mesons at Large Transfer

abstract:
  At forward angles, the cross-sections of photoproduction of vector mesons
($\rho$, $\omega$, and $\phi$) are well accounted for by the exchange of the
Pomeron at high energies, while contributions of $t$ channel exchange of
Reggeons are significant at low energies. At large angles, the impact parameter
becomes small enough to prevent their constituents to build up the exchanged
Reggeons or Pomeron. Two gluon exchange appears to dominate above $-t\simeq 1$
GeV$^2$, especially in the $\phi$ channel.


title:
SO(10) Unification of Color Superconductivity and Chiral Symmetry
  Breaking?

abstract:
  Motivated by the SO(5) theory of high-temperature superconductivity and
antiferromagnetism, we ask if an SO(10) theory unifies color superconductivity
and chiral symmetry breaking in QCD. The transition to the color
superconducting phase would then be analogous to a spin flop transition. While
the spin flop transition generically has a unified SO(3) description, the SO(5)
and SO(10) symmetric fixed points are unstable, at least in (4 - epsilon)
dimensions, and require the fine-tuning of one additional relevant parameter.
If QCD is near the SO(10) fixed point, it has interesting consequences for
heavy ion collisions and neutron stars.


title: Color Superconductivity in High Density Effective Theory

abstract:
  In this talk, I discuss the recent development in color superconductivity in
terms of effective field theory. By investigating the Cooper pair gap equations
at high density, we see that the effective theory simplifies the gap analysis
very much, especially in finding the ground state, the precise form of the gap,
and the critical temperature. Furthermore, the effective theory enables us to
estimate the critical density for color superconductivity, which is found to be
around $230~{\rm MeV}$ in the hard-dense-loop approximation. Finally, I briefly
mention the low-lying spectra of color superconductor at high density.


title:
Lepton pair production by high-energy neutrino in an external
  electromagnetic field

abstract:
  The process of the lepton pair production by a neutrino propagating in an
external electromagnetic field is investigated in the framework of the Standard
Model. Relatively simple exact expression for the probability as the single
integral is obtained, which is suitable for a quantitative analysis.


title:
Reconciling $G_A/G_V, <r_n^2>$ and $\mu_{p,n}$ in Chiral Quark Model
  with one Gluon Generated Configuration Mixing

abstract:
  The spin polarization functions $(\Delta u, ~\Delta d, ~\Delta s)$ for proton
are calculated in the chiral quark model ($\chi$QM) with SU(3) symmetry
breaking as well as configuration mixing generated by one gluon exchange forces
for the NMC and the most recent E866 data. Besides reproducing the spin
polarization functions $\Delta u,\Delta d, \Delta s$ as well as $G_A/G_V$, it
can accomodate nucleon magnetic moments and neutron charge radius as well, thus
resolving the compatibility problem of these parameters which could not be
achieved in constituent quark models.


title: Isospin Breaking and $\omega$->$\pi\pi$ Decay

abstract:
  We study $\omega\to\pi^+\pi^-$ decay up to including all orders of the chiral
expansion and one-loop level of mesons in formlism of chiral constituent quark
model. This G-parity forbidden decay is caused by $m_u\neq m_d$ and
electromagnetic interaction of mesons. We illustrate that in the formlism both
nonresonant contact interaction and $\rho$ resonance exchange contribute to
this process, and the contribution from $\rho$ resonance exchange is dominant.
We obtain that transition matrix element is
$<~\rho|H_{\rho\omega}|\omega>=[-(3956\pm 280)-(1697\pm 130)i]$MeV$^2$, and
isospin breaking parameter is $m_d-m_u=3.9\pm 0.22$MeV at energy scale $\mu\sim
m_\omega$.


title: Neutrino mass spectrum and neutrinoless double beta decay

abstract:
  The relations between the effective Majorana mass of the electron neutrino,
$m_{ee}$, responsible for neutrinoless double beta decay, and the neutrino
oscillation parameters are considered. We show that for any specific
oscillation pattern $m_{ee}$ can take any value (from zero to the existing
upper bound) for normal mass hierarchy and it can have a minimum for inverse
hierarchy. This means that oscillation experiments cannot fix in general
$m_{ee}$. Mass ranges for $m_{ee}$ can be predicted in terms of oscillation
parameters with additional assumptions about the level of degeneracy and the
type of hierarchy of the neutrino mass spectrum. These predictions for $m_{ee}$
are systematically studied in the specific schemes of neutrino mass and flavor
which explain the solar and atmospheric neutrino data. The contributions from
individual mass eigenstates in terms of oscillation parameters have been
quantified. We study the dependence of $m_{ee}$ on the non-oscillation
parameters: the overall scale of the neutrino mass and the relative mass
phases. We analyze how forthcoming oscillation experiments will improve the
predictions for $m_{ee}$. On the basis of these studies we evaluate the
discovery potential of future \znbb decay searches. The role \znbb decay
searches will play in the reconstruction of the neutrino mass spectrum is
clarified. The key scales of $m_{ee}$, which will lead to the discrimination
among various schemes are: $m_{ee} \sim 0.1$ eV and $m_{ee} \sim 0.005$ eV.


title: Mass Matrices in E6 Unification

abstract:
  We study a supersymmetric E6 grand unified model in which the SU(5) 5^*
components are twisted in the third generation 27. Supplementing the adjoint
Higgs field to a model analyzed previously, we calculate the mass matrices for
the up and down quarks and charged leptons. Although the number of free
parameters is less than that of observables, an overall fitting to the observed
masses and mixing angles is shown to be possible. Most notably, we find two
novel, parameter-independent relations between the lepton 2-3 mixing angle and
the quark masses and CKM mixing angles that are in good agreement with the
large lepton mixing recently observed.


title: Physics with an e+e- Linear Collider at High Luminosity

abstract:
  The physics potential is briefly summarized for an e+e- linear collider
operating at center-of-mass energies up to \sqrt{s} = 1 TeV and delivering
integrated luminosities up to \int L = 0.5 ab^(-1) in one to two years. This
machine will allow us to perform precision studies of the top quark and the
electroweak gauge bosons at the per-mille level. It will be an ideal instrument
to investigate the properties of the Higgs boson and to establish essential
elements of the Higgs mechanism as the fundamental mechanism for breaking the
electroweak symmetries. In the area beyond the Standard Model, new particles
and their interactions can be discovered and explored comprehensively. In
supersymmetric theories, the mechanism of the symmetry breaking can be
investigated experimentally and the underlying unified theory can be
reconstructed. The high precision allows stable extrapolations up to scales
near the Planck mass.


title: R-parity violating anomaly mediated supersymmetry breaking

abstract:
  We propose a new scenario that solves the slepton negative mass squared
problem of the minimal supersymmetric standard model with anomaly mediated
supersymmetry breaking. The solution is achieved by including three trilinear
R-parity violating operators in the superpotential. The soft supersymmetry
breaking terms satisfy renormalisation group invariant relations in terms of
supersymmetric couplings and the overall supersymmetry breaking mass scale.
Flavour changing neutral currents can be naturally highly suppressed. A
specific model predicts tan beta=4.2+/-1.0. Excluding sleptons, the
supersymmetric particle spectrum then depends upon two remaining free
parameters. In the case of the R-parity violating couplings set at their
quasi-fixed points at a supersymmetric GUT scale, the whole sparticle spectrum
approximately depends upon only one free parameter. Imposing experimental
limits leads to a constrained and distinctive phenomenology. The lightest
CP-even Higgs of mass m_h=118 GeV would be seen at the Tevatron. All sparticles
and heavy Higgs would evade detection except for the lightest charginos and
neutralinos, whose distinctive leptonic decays would be seen at the LHC.


title: Searching for Lorentz Violation in the Ground State of Hydrogen

abstract:
  A theoretical analysis is made of experiments in hydrogen and antihydrogen
that test CPT. We show that these experiments also provide sensitive tests of
Lorentz symmetry for protons and electrons. Both 1S-2S transitions and Zeeman
hyperfine splittings in the ground state are examined. We find that sensitivity
to CPT and Lorentz violation at the level of $10^{-27}$ GeV is attainable.


title: Hermitian quark mass matrices with four texture zeros

abstract:
  We provide a complete and systematic analysis of hermitian, hierarchical
quark mass matrices with four texture zeros. Using triangular mass matrices,
each pattern of texture zeros is readily shown to lead to a definite relation
between the CKM parameters and the quark masses. Nineteen pairs are found to be
consistent with present data, and one other is marginally acceptable. In
particular, no parallel structure between the up and down mass matrices is
found to be favorable with data.


title: Study of R-parity-violating supersymmetric signals at an e-e- collider

abstract:
  We study the pair production of right selectrons at a 500 GeV $e^-e^-$
collider followed by their decay into an electron and a lightest neutralino.
This lightest neutralino decays into multifermion final states in the presence
of R-parity-violating couplings. A detailed analysis of possible signals is
performed for some important regions of the parameter space. The signals are
essentially free from the standard model backgrounds.


title:
Breaking the Barriers - Uniting Accelerator and Cosmic Ray p-p Cross
  Sections

abstract:
  We make a QCD-inspired parameterization of all accelerator data on forward
proton-proton and antiproton-proton scattering amplitudes. Using vector
dominance and the additive quark model, we show that the same parameters also
fit gamma p and gamma gamma interactions. Using the high energy predictions of
our model, along with Glauber theory, we calculate proton-air cross sections at
energies near sqrt s approx 30 TeV. The comparisons of p-air cosmic ray
measurements with our QCD model predictions provide a strong constraint on the
inclusive particle production cross section.


title: New Physics Effects From B Meson Decays

abstract:
  In this talk, we point out some of the present and future possible signatures
of physics beyond the Standard Model from B-meson decays, taking R-parity
conserving and violating supersymmetry as illustrative examples.


title:
Single chargino production with R-parity lepton number violation in
  electron-electron and muon-muon collisions

abstract:
  We examine single chargino production in conjunction with R-parity lepton
number violation in future lepton-lepton collisions. Present bounds on R-parity
violating couplings allow for a production cross section of the order of
${\cal{O}} (10 {fb})$ for a wide range of sneutrino and chargino masses.
Scenarios of chargino decay which lead to purely leptonic signals in the final
state and without missing energy are also discussed.


title: Higgs induced light leptoquark-diquark mixing and proton decay

abstract:
  In low energy phenomenology to avoid the strong constraints of proton decay
it is usually assumed that light ($\approx $ 250 Gev) leptoquarks couple only
to quark-lepton pairs and light diquarks couple only to quark pairs. In this
paper we present two specific examples where the higgs induced mixing between
leptoquarks and diquarks through trilinear interaction terms reintroduces the
troublesome couplings and gives rise to proton decay. The bound on the unknown
parameters of this scenario that arise from proton life time has been derived.


title: Alignment in hadronic interactions

abstract:
  The alignment of the products of very high energy interactions seen in
mountain altitude experiments is one of the most puzzling phenomena in cosmic
ray physics for quite a long time. The observations of the Pamir and Chacaltaya
emulsion chamber groups and by the Tien-Shan extensive air shower experiment,
together with a very clear event seen in the Concorde French-Japanese
experiment in the stratosphere, makes the experimental basis very substantial.
In the present paper a novel possible explanation is put forward.


title: Novel Relations between Lepton and Quark Mixings

abstract:
  A novel relation is found which gives the 2-3 lepton mixing angle in terms of
quark masses and CKM mixing: \tan\theta_{\mu\tau}=(m_b/m_s)V_{cb}. This
relation, which is remarkably in good agreement with the quark data and the
large lepton mixing recently observed, is a kind of SO(10) GUT relation similar
to the celebrated bottom-tau mass ratio in SU(5). The GUT models in which this
relation hold should have a `twisted SO(10)' structure between the second and
third generations, in order to really explain the large lepton mixing, or
equivalently, the right-hand side of the relation.


title: Radiative Higgs-Sector CP Violation in the MSSM

abstract:
  We briefly review the phenomenological implications of the minimal
supersymmetric standard model (MSSM) with explicit radiative breaking of CP
invariance in the Higgs sector for the LEP2 and Tevatron colliders.


title:
Exclusive production of pion pairs in gamma^* gamma collisions at large
  Q^2

abstract:
  We perform a QCD analysis of the exclusive production of two mesons in
gamma^* gamma collisions in the kinematical domain of large photon virtuality Q
and small hadronic invariant mass W. This reaction is dominated by a scale
invariant mechanism which factorizes into a perturbative subprocess, gamma^*
gamma --> q qbar or gamma^* gamma --> g g, and a generalized two-meson
distribution amplitude. We develop in detail the phenomenology of this process
at e^+ e^- colliders. Using a simple model for the two-pion distribution
amplitude, based on its general properties, we estimate the cross section for
the kinematics accessible at BABAR, BELLE, CLEO and LEP.


title: Revisiting the U_A(1) problems

abstract:
  We survey various U_A(1) problems and attempt to resolve the two puzzles
related to the eta mesons that have experimental verification. Specifically, we
first explore the Goldstone structure of the eta and eta' mesons in the context
of eta-eta' mixing using ideas based on QCD. Then we study the eta decays
eta->3pi0, eta'->3pi0 and eta'->eta pi pi. Finally we arrive at essentially the
same picture in the dynamical scheme based on consistently coupled
Schwinger-Dyson and Bethe-Salpeter integral equations. This chirally
well-behaved bound-state approach clarifies the distinction between the usual
axial-current decay constants and the gamma gamma decay constants in the
eta-eta' complex. Allowing for the effects of the SU(3) flavor symmetry
breaking in the quark-antiquark annihilation, leads to the improved eta-eta'
mass matrix.


title: An Analysis of the Asymptotic Limit of Gluon Shadowing

abstract:
  We examine the gluon distributions in nuclei in the asymptotic region defined
by $Q^2 \to \infty$, $x \to 0$. An analysis using the Double Asymptotic Scaling
variables of Ball and Forte is proposed. New scaling relations are predicted
which can help disentangling the different mechanisms of low $x$ perturbative
QCD evolution in nuclei.


title: Improved GUT and SUSY breaking by the same field

abstract:
  In a previous paper, we presented a model in which the {\em same} modulus
field breaks SUSY and a simple GUT gauge group, and which has {\em dynamical}
origins for {\em both} SUSY breaking and GUT scales. In this model, the
supergravity (SUGRA) and gauge mediated (GM) contributions to MSSM scalar and
gaugino masses are comparable - this enables a realistic spectrum to be
attained since GM contribution to the right-handed (RH) slepton (mass)^2 by
itself (i.e., neglecting SUGRA contribution to sfermion {\em and} gaugino
masses) is negative. But, in general, the SUGRA contribution to sfermion masses
(from non-renormalizable contact K\"ahler terms) leads to flavor violation. In
this paper, we use the recently proposed idea of gaugino mediated SUSY breaking
(\tilde{g}MSB) to improve the above model. With MSSM matter and SUSY breaking
fields localized on separate branes in an extra dimension of size R \sim 5
M^{-1}_{Pl} (in which gauge fields propagate), the SUGRA contribution to
sfermion masses (which violates flavor) is suppressed. As in 4 dimensions, MSSM
gauginos acquire {\em non}-universal masses from both SUGRA and GM - gaugino
masses (in particular the SUGRA contribution to gaugino masses), in turn,
generate acceptable sfermion masses through RG evolution; the phenomenology is
discussed briefly. We also point out that a) in models where SUSY is broken by
a GUT non-singlet field, there is, in general, a contribution to MSSM gaugino
(and scalar) masses from the coupling to heavy gauge multiplet which {\em
might} be {\em comparable} to the SUGRA contribution and b) models of GM
proposed earlier which also have negative RH slepton (mass)^2 can be rendered
viable using the \tilde{g}MSB idea.


abstract:
  The masses of elementary particles and hadrons can be calculated from the
periodic table of elementary particles. The periodic table is derived from
dimensional hierarchy for the seven extra spatial dimensions. As a molecule is
the composite of atoms with chemical bonds, a hadron is the composite of
elementary particles with hadronic bonds. The masses of elementary particles
and hadrons can be calculated using the periodic table with only four known
constants: the number of the extra spatial dimensions in the superstring, the
mass of electron, the mass of Z=B0, and the fine structure constant. The
calculated masses are in good agreement with the observed values. For examples,
the calculated masses for the top quark, neutron, and pion are 176.5 GeV,
939.54MeV, and 135.01MeV in excellent agreement with the observed masses, 176
=B1 13 GeV, 939.57 MeV, and 134.98 MeV, respectively. The masses of 110 hadrons
are calculated. The overall average difference between the calculated masses
and the observed masses for all hadrons is 0.29 MeV. The periodic table of
elementary particles provides the most comprehensive explanation and
calculation for the masses of elementary particles and hadrons.

categories: hep-ph astro-ph gr-qc hep-ex hep-th quant-ph


title: B decays at the LHC

abstract: We review the prospects for B decay studies at the LHC.


title: Quark Mixings in $SU(6)\times SU(2)_R$ and Suppression of $V_{ub}$

abstract:
  The quark mixing matrix $V_{CKM}$ is studied in depth on the basis of
superstring inspired $SU(6)\times SU(2)_R$ model with global flavor symmetries.
The sizable mixings between right-handed down-type quark $D^c$ and colored
Higgs field $g^c$ potentially occur but no such mixings in up-type quark
sector. In the model the hierarchical pattern of $V_{CKM}$ is understood
systematically. It is shown that due to large $D^c$-$g^c$ mixings $V_{ub}$ is
naturally suppressed compared to $V_{td}$. It is pointed out that the observed
suppression of $V_{ub}$ is in favor of the presence of $SU(2)_R$ gauge symmetry
but not in accord with generic SU(5) GUT.


title: Models of Dynamical Supersymmetry Breaking with Gauged $U(1)_R$ Symmetry

abstract:
  We present simple models of dynamical supersymmetry breaking with gauged
U(1)_R symmetry. The minimal supersymmetric standard model and supersymmetric
SU(5) GUT are considered as the visible sector. The anomaly cancellation
conditions for U(1)_R are investigated in detail and simple solutions of the
R-charge assignments are found. We show that this scenario of dynamical
supersymmetry breaking is phenomenologically viable with the gravitino mass of
order 1 TeV or 10 TeV.


title: Borel-Pade vs Borel-Weniger method: a QED and a QCD example

abstract:
  Recently, Weniger (delta sequence) method has been proposed by the authors of
Ref. [1] (Jentschura et al.) for resummation of truncated perturbation series
in quantum field theories. Those authors presented numerical evidence
suggesting that this method works better than Pade approximants when we resum a
function with singularities in the Borel plane but not on the positive axis. We
present here numerical evidence suggesting that in such cases the combined
method of Borel-Pade works better than its analog Borel-Weniger, and that it
may work better or comparably well in some of the cases when there are
singularities on the positive axis in the Borel plane.


title: Toward the correlated analysis of perturbative QCD observables

abstract:
  We establish direct connection between ghost-free formulations of
RG-invariant perturbation theory in the both Euclidean and Minkowskian regions.
By combining the trick of resummation of the $\pi^2$-terms for the invariant
QCD coupling and observables in the time-like region with fresh results on the
"analyticized" coupling $\alpha_{\rm an}(Q^2)$ and observables in the
space-like domain we formulate a self-consistent scheme, free of ghost
troubles. The basic point of this joint construction is the "dipole spectral
relation" emerging from axioms of local QFT. Then we consider the issue of the
heavy quark thresholds and devise a global scheme for the data analysis in the
whole accessible space-like and time-like domain with various numbers of active
quarks. Observables in both the regions are presented in a form of non-power
perturbation series with improved convergence properties. Preliminary estimates
indicate that this global scheme produces results a bit different - on a few
per cent level for $\bar{\alpha}_s$ - from the usual one, thus influencing the
total picture of the QCD parameters correlation.


title: Semi-inclusive structure functions in the spectator model

abstract:
  We establish the relationship between distribution and fragmentation
functions and the structure functions appearing in the cross section of
polarized 1-particle inclusive deep-inelastic scattering. We present spectator
model evaluations of these structure functions focusing on the case of an
outgoing spin-1/2 baryon. Distribution functions obtained in the spectator
model are known to fairly agree at low energy scales with global
parameterizations extracted, for instance, from totally inclusive DIS data.
Therefore, we expect it to give good hints on the functional dependence of the
structure functions on the scaling variables x(Bjorken), z and on the
transverse momentum of the observed outgoing hadron, P_{h\perp}. Presently,
this dependence is not very well known, but experiments are planned in the near
future.


title:
Anomalous t-dependence in diffractive electroproduction of 2S radially
  excited light vector mesons at HERA

abstract:
  Within the color dipole gBFKL dynamics applied to the diffraction slope we
predict an anomalous t dependence of the differential cross section as a
function of energy and Q^2 for production of radially excited V'(2S) light
vector mesons in contradiction with a well known standard monotonous t-
behaviour for V(1S) mesons. The origin of this phenomenon is based on the
interplay of the nodal structure of V'(2S) radial wave function with the energy
and dipole size dependence of the color dipole cross section and of the
diffraction slope. We present how a different position of the node in V'(2S)
wave function leads to a different form of anomalous t- behaviour of the
differential cross section and discuss a possibility how to determine this
position from the low energy and HERA data.


title:
The Wave Function of 2S Radially Excited Vector Mesons from Data for
  Diffraction Slope

abstract:
  In the color dipole gBFKL dynamics we predict a strikingly different Q^2 and
energy dependence of the diffraction slope for the elastic production of ground
state V(1S) and radially excited V'(2S) light vector mesons. The color dipole
model predictions for the diffraction slope for \rho^0 and \phi^0 production
are in a good agreement with the data from the fixed target and collider HERA
experiments. We present how a different form of anomalous energy and Q^2
dependence of the diffraction slope for V'(2S) production leads to a different
position of the node in radial wave function and discuss a possibility how to
determine this position from the fixed target and HERA data.


title:
Complete Two-loop Dominant Corrections to the Mass of the Lightest
  CP-even Higgs Boson in the Minimal Supersymmetric Standard Model

abstract:
  Using an effective potential approach, we compute two-loop radiative
corrections to the MSSM lightest ${\cal CP}$-even Higgs boson mass $M_{h^0}$ to
${\cal O}(\alpha_t^2)$ for arbitrary left-right top-squark mixing and
$\tan\beta$. We find that these corrections can increase $M_{h^0}$ by as much
as 5 GeV; assuming a SUSY scale of 1 TeV, the upper bound on the Higgs boson
mass is $M_{h^0}\approx 129\pm 5$ GeV for the top quark pole mass $175\pm 5$
GeV. We also derive an analytical approximation formula for $M_{h^0}$ which is
good to a precision of $\lsim 0.5$ GeV for most of the parameter space and
suitable to be further improved by including renormalization group resummation
of leading and next-to-leading order logarithmic terms. Our final compact
formula admits a clear physical interpretation: radiative corrections up to the
two-loop level can be well approximated by a one-loop expression with
parameters evaluated at the appropriate scales, plus a smaller finite two-loop
threshold correction term.


title:
Multibaryons in the collective coordinate approach to the SU(3) Skyrme
  model

abstract:
  We obtain the rotational spectrum of strange multibaryon states by performing
the SU(3) collective coordinate quantization of the static multi-Skyrmions.
These background configurations are given in terms of rational maps, which are
very good approximations and share the same symmetries as the exact solutions.
Thus, the allowed quantum numbers in the spectra and the structure of the
collective Hamiltonians we obtain are also valid in the exact case. We find
that the predicted spectra are in overall agreement with those corresponding to
the alternative bound state soliton model.


title:
Effective potential calculation of the MSSM lightest CP-even Higgs boson
  mass

abstract:
  I summarize results of two-loop effective potential calculations of the
lightest CP-even Higgs boson mass in the minimal supersymmetric standard model.


title:
Pursuing the origin of electroweak symmetry breaking: a 'Bayesian
  Physics' argument for a 600 GeV e+e- collider

abstract:
  High-energy data has been accumulating over the last ten years, and it should
not be ignored when making decisions about the future experimental program. In
particular, we argue that the electroweak data collected at LEP, SLC and
Tevatron indicate a light scalar particle with mass less than 500 GeV. This
result is based on considering a wide variety of theories including the
Standard Model, supersymmetry, large extra dimensions, and composite models. We
argue that a high luminosity, 600 GeV e+e- collider would then be the natural
choice to feel confident about finding and studying states connected to
electroweak symmetry breaking. We also argue from the data that worrying about
resonances at multi-TeV energies as the only signal for electroweak symmetry
breaking is not as important a discovery issue for the next generation of
colliders. Such concerns should perhaps be replaced with more relevant
discovery issues such as a Higgs boson that decays invisibly, and ``new
physics'' that could conspire with a heavier Higgs boson to accommodate
precision electroweak data. An e+e- collider with energy less than about 600
GeV is ideally suited to cover these possibilities.


title: A Sterile Neutrino Needed for Heavy-Element Nucleosynthesis

abstract:
  A neutrino mass-mixing scheme which successfully avoids the "alpha effect,"
allowing r-process nucleosynthesis in the neutrino-heated ejecta of supernovae,
quite independently requires the same parameters as the scheme which best fits
all current indications for neutrino mass. The significance for particle
physics is this independent evidence for (1) at least one light sterile
neutrino, nu_s; (2) a near maximally-mixed nu_mu-nu_tau doublet split from a
lower mass nu_mu-nu_s doublet; (3) nu_mu-nu_e mixing >~ 10^-4; and (4) a
splitting between the doublets (measured by the nu_mu-nu_e mass difference) >~
1 eV^2, favoring the upper part of the LSND range. If correct, it is
tantalizing that neutrinos with tiny masses which mix with sterile species have
profound effects on massive objects and the creation of the heaviest elements.


title: Construction of a Minimal Higgs SO(10) SUSY GUT Model

abstract:
  A full account is given of the procedure used by the authors to construct an
SO(10) supersymmetric grand unified model of the fermion mass matrices. Various
features of the model which gives remarkably accurate results for the quark and
lepton masses and mixings were presented earlier in separate publications. The
construction of the matrices is first discussed in the framework of effective
operators, from which one naturally obtains the maximal \nu_\mu - \nu_\tau
mixing, while the small angle or maximal mixing solutions for the solar
neutrinos depend upon the nature of the Majorana matrix. A set of Higgs and
fermion superfields is then introduced from which the Higgs and Yukawa
superpotentials uniquely give the structure of the mass matrices previously
obtained. The right-handed Majorana matrix arises from one Higgs field coupling
to several pairs of superheavy conjugate neutrino singlets. For the simple
version considered, 10 input parameters accurately yield the 20 masses and
mixings of the quarks and leptons, and the 3 masses of the right-handed
neutrinos.


title: Particle production in the oscillating inflation model

abstract:
  We investigate the particle production of a scalar field $\chi$ coupled to an
inflaton field $\phi$ ($g^2\phi^2\chi^2/2$) in the {\it oscillating inflation}
model, which was recently proposed by Damour and Mukhanov. Although the
fluctuation of the $\phi$ field can be effectively enhanced during a stage of
the oscillating inflation, the maximum fluctuation is suppressed as the
critical value $\phi_c$ which indicates the scale of the core part of the
inflaton potential decreases, in taking into account the back reaction effect
of created particles. As for the $\chi$ particle production, we find that
larger values of the coupling constant $g$ are required to lead to an efficient
parametric resonance with the decrease of $\phi_c$, because an effective mass
of inflaton around the minimum of its potential becomes larger. However, it is
possible to generate the superheavy $\chi$ particle whose mass is greater than
$10^{14}$ GeV, which would result in an important consequence for the GUT
baryogenesis.


title:
Contact interaction probes at the Linear Collider with polarized
  electron and positron beams

abstract:
  For contact-interaction searches at the Linear Collider, we discuss the
advantages of polarizing both the electron and the positron beams as compared
with polarizing only the electron beam. In particular, for the processes
e^+e^-\to \mu^+\mu^-, \tau^+\tau^-, b\bar{b} and c\bar{c} at a future e^+e^-
collider with \sqrt{s}=0.5 TeV we derive model-independent bounds on the
four-fermion contact interaction parameters from studies of the helicity cross
sections.


title:
Semi-classical Description of Exclusive Meson Pair Production in
  $\gamma^*\gamma$ Scattering

abstract:
  A semi-classical picture is given for the production of exclusive meson pairs
in \gamma\gamma^* scattering using elements of the Lund string fragmentation
model, spin and C-parity conservation. The model can be generalized to the
production of any few meson states in scattering reactions at intermediate
momentum transfers. As an example we show that we get a consistent description
for the time-like pion form factor. For the reaction \gamma\gamma^*\to
\pi^+\pi^- we find a seizable cross section at LEP2 energies.


title: Issues in Leading Particle and Charm Production in DIS at HERA

abstract:
  A Monte Carlo simulation based on O(alpha_s) QCD matrix elements matched to
parton showers shows that final-state hadrons in deep inelastic scattering
(DIS) can be used to tag events with a single (anti)quark recoiled against the
proton. The method is particularly suited to study the mean charge of leading
particles, which is sensitive to fragmentation and sea quark contribution to
the proton structure function. We also discuss methods to study the charm
production in DIS using the Breit frame.


title: Effect of flavor mixing on the time delay of massive supernova neutrinos

abstract:
  The neutrinos and antineutrinos of all the three flavors released from a
galactic supernova will be detected in the water Cerenkov detectors. We show
that even though the neutral current interaction is flavor blind, and hence
neutrino flavor mixing cannot alter the total neutral current signal in the
detector, it can have a non-trivial impact on the delay of massive neutrinos
and alters the neutral current event rate as a function of time. We have
suggested various variables of the neutral and charged current events that can
be used to study this effect. In particular the ratio of charged to neutral
current events can be used at early times while the ratio of the energy moments
for the charged to the neutral current events can form useful diagnostic tools
even at late times to study neutrino mass and mixing.


title: Semi-Exclusive Production of Photons at HERA

abstract:
  We study the feasibility of measuring semi-exclusive photon production \gamma
+ p \to \gamma + Y at HERA. The cross section of photons produced at large
transverse momenta, recoiling off an inclusive system Y of limited mass, can
without photon isolation cuts be simply expressed in terms of hard pQCD
subprocesses and standard target parton distributions. With the help of event
generators we identify the kinematic region where quark and gluon fragmentation
processes can be neglected. The cross section in this semi-exclusive region is
large enough to be measured with an upgraded HERA luminosity of L = 100/pb. The
subprocesses of lowest order in \alpha_s are suppressed at low recoil masses
M_Y, compared to higher order gluon exchange, i.e. BFKL contributions. The
distinct M_Y-dependence makes it possible to determine experimentally the
kinematic range where the higher order processes dominate.


title: $K_{\ell 4}$ Form-Factors and $\pi$-$\pi$ Scattering

abstract:
  The $F$ and $G$ form-factors of $K_{\ell4}$ and the quark condensates are
calculated to ${\cal O}(p^6)$ in Chiral Perturbation Theory (CHPT). Full
formulas are presented as much as possible. A full refit of most of the ${\cal
O}(p^4)$ CHPT parameters is done with a discussion of all inputs and underlying
assumptions. We discuss the consequences for the vacuum expectation values,
decay constants, pseudoscalar masses and $\pi$-$\pi$ scattering.


title: String/M theory

abstract:
  This is a brief review of the present status, of some recent developments and
of the open challenges in string/M theory.


title: Single top quark tW+X production at the LHC: a closer look

abstract:
  We have reexamined the tW+X single top-quark production process which is
important at the LHC contrary to the Tevatron. The special attention was paid
to the treatment of the 2->2[Wt] process and the part of it's next-to-leading
correction: 2->3[Wtb] process. We show that 2->3[Wtb] process has to be
correctly taken into account with a proper subtraction of the top pair
contribution and that it has qualitatively different kinematical distributions
from the 2->2[Wt] process. We present the total cross section of the tW+X
production to be about 62 pb at QCD scale be taken as a top quark mass, suggest
the method of combining Wt and Wtb processes with gauge invariant subtraction
of the tt-bar part which allows to reproduce correct kinematical properties and
perform a proper event simulation of the tW+X process in the whole kinematical
region.


title:
The tensor reduction and master integrals of the two-loop massless
  crossed box with light-like legs

abstract:
  The class of the two-loop massless crossed boxes, with light-like external
legs, is the final unresolved issue in the program of computing the scattering
amplitudes of 2 --> 2 massless particles at next-to-next-to-leading order.
  In this paper, we describe an algorithm for the tensor reduction of such
diagrams. After connecting tensor integrals to scalar ones with arbitrary
powers of propagators in higher dimensions, we derive recurrence relations from
integration-by-parts and Lorentz-invariance identities, that allow us to write
the scalar integrals as a combination of two master crossed boxes plus
simpler-topology diagrams.
  We derive the system of differential equations that the two master integrals
satisfy using two different methods, and we use one of these equations to
express the second master integral as a function of the first one, already
known in the literature. We then give the analytic expansion of the second
master integral as a function of epsilon=(4-D)/2, where D is the space-time
dimension, up to order O(epsilon^0).


title: On Thermalization in Classical Scalar Field Theory

abstract:
  Thermalization of classical fields is investigated in a \phi^4 scalar field
theory in 1+1 dimensions, discretized on a lattice. We numerically integrate
the classical equations of motion using initial conditions sampled from various
nonequilibrium probability distributions. Time-dependent expectation values of
observables constructed from the canonical momentum are compared with thermal
ones. It is found that a closed system, evolving from one initial condition,
thermalizes to high precision in the thermodynamic limit, in a time-averaged
sense. For ensembles consisting of many members with the same energy, we find
that expectation values become stationary - and equal to the thermal values -
in the limit of infinitely many members. Initial ensembles with a nonzero
(noncanonical) spread in the energy density or other conserved quantities
evolve to noncanonical stationary ensembles. In the case of a narrow spread,
asymptotic values of primary observables are only mildly affected. In contrast,
fluctuations and connected correlation functions will differ substantially from
the canonical values. This raises doubts on the use of a straightforward
expansion in terms of 1PI-vertex functions to study thermalization.


title: Supersymmetric left-right model and scalar potential

abstract:
  We construct a scalar potential of supersymmetric left-right model in the
limit when supersymmetry is valid.


title:
Time Dependence of Chemical Freeze-out in Relativistic Heavy Ion
  Collisions

abstract:
  We investigate chemical and thermal freeze-out time dependencies for strange
particle production for CERN SPS heavy ion collisions in the framework of a
dynamical hadronic transport code. We show that the Lambda yield changes
considerably after hadronization in the case of Pb+Pb collisions, whereas for
smaller system sizes (e.g. S+S) the direct particle production dominates over
production from inelastic rescattering. Chemical freeze-out times for strange
baryons in Pb+Pb are smaller than for non-strange baryons, but they are still
sufficiently long for hadronic rescattering to contribute significantly to the
final Lambda yield. Based on inelastic and elastic cross section estimates we
expect the trend of shorter freeze-out times (chemical and kinetic), and thus
less particle production after hadronization, to continue for multi-strange
baryons.


title: Flavor Violation as a Probe of the MSSM Higgs Sector

abstract:
  At moderate to large tan(beta), it is no longer possible to simultaneously
diagonalize the masses of quarks and their couplings to the neutral Higgs
bosons. The resulting flavor violations of the form (\bar b_R d_L H) and (\bar
b_R s_L H) do not generate large meson-anti-meson mixing amplitudes but do
generate large contributes to rare decays such as B_s -> mu mu. Run II of the
Tevatron willl probe a large region of interesting MSSM parameter space through
this decay channel. This talk is based on results obtained with K.S. Babu and
presented in hep-ph/9909476.


title: Pion propagation in the linear sigma model at finite temperature

abstract:
  We construct effective one-loop vertices and propagators in the linear sigma
model at finite temperature, satisfying the chiral Ward identities and thus
respecting chiral symmetry, treating the pion momentum, pion mass and
temperature as small compared to the sigma mass. We use these objects to
compute the two-loop pion self-energy. We find that the perturbative behavior
of physical quantities, such as the temperature dependence of the pion mass, is
well defined in this kinematical regime in terms of the parameter
m_pi^2/4pi^2f_pi^2 and show that an expansion in terms of this reproduces the
dispersion curve obtained by means of chiral perturbation theory at leading
order. The temperature dependence of the pion mass is such that the first and
second order corrections in the above parameter have the same sign. We also
study pion damping both in the elastic and inelastic channels to this order and
compute the mean free path and mean collision time for a pion traveling in the
medium before forming a sigma resonance and find a very good agreement with the
result from chiral perturbation theory when using a value for the sigma mass of
600 MeV.


title: Anomalous U(1) Symmetry and Sparticles

abstract:
  Using anomalous U(1) symmetry the quark mass texture is determined uniquely.
We analyze squark mass spectrum based on the above mass matrices and discuss
the possibility to solve the problems of FCNC and CP caused by complex phases
of soft terms, including the viewpoint of M theory.