title: Sensitive Search for a Permanent Muon Electric Dipole Moment

abstract:
  We are proposing a new method to carry out a dedicated search for a permanent
electric dipole moment (EDM) of the muon with a sensitivity at a level of
10^{-24} e cm. The experimental design exploits the strong motional electric
field sensed by relativistic particles in a magnetic storage ring. As a key
feature, a novel technique has been invented in which the g-2 precession is
compensated with radial electric field. This technique will benefit greatly
when the intense muon sources advocated by the developers of the muon storage
rings and the muon colliders become available.


title: Neutrino propagation in matter and CP violation

abstract:
  We point out that the dependence on the order of the matter through which
neutrinos pass can provide a window into CP violation in the neutrino sector.
This allows for study of CP in the neutrino sector without the necessity of
making a comparison between the behavior of neutrinos and that of
antineutrinos.


title: On the massless "just-so" solution to the solar neutrino problem

abstract:
  We study the effect of the non-resonant, vacuum oscillation-like neutrino
flavor conversion induced by non-standard flavor changing and non-universal
flavor diagonal neutrino interactions with electrons in the sun. We have found
an acceptable fit for the combined analysis for the solar experiments total
rates, the Super-Kamiokande (SK) energy spectrum and zenith angle dependence.
Phenomenological constraints on non-standard flavor changing and non-universal
flavor diagonal neutrino interactions are considered.


title: A Small Cosmological Constant from Warped Compactification with Branes

abstract:
  We present a possible explanation for the smallness of the observed
cosmological constant using a variant of the Randall-Sundrum(RS)-
Goldberger-Wise paradigm for a warped extra dimension. In contrast to RS, we
imagine that we are living on the positive tension Planck brane, or on a
zero-tension TeV brane. In our model there are two solutions for the scalar
field in the bulk and the corresponding brane separations, one of which is
tuned to have zero cosmological constant. We show that in the other solution,
which is a false vacuum state, the 4-D cosmological constant can be naturally
small, due to exponential suppression by the warp factor. The radion is in the
milli-eV mass range, and if we live on a TeV brane its couplings are large
enough that it can measurably alter the gravitational force at submillimeter
distances. In this case the Kaluza-Klein excitations of the graviton can also
contribute to submillimeter deviations from Newtonian gravity, and we have in
addition the collider phenomenology of the usual TeV-scale radion.


title: Polarized Proton Nucleus Scattering

abstract:
  We show that, to a very good approximation, the ratio of the spin-flip to the
non-flip parts of the elastic proton-nucleus amplitude is the same as for
proton-nucleon scattering at very high energy. The result is used to do a
realistic calculation of the analyzing power A_N for pC scattering in the
Coulomb-nuclear interference (CNI) region of momentum transfer.


title: Orthogonal U(1)'s, Proton Stability and Extra Dimensions

abstract:
  In models with a low quantum gravity scale, one might expect that all
operators consistent with gauge symmetries are present in the low-energy
effective theory. If this is the case, some mechanism must be present to
adequately suppress operators that violate baryon number. Here we explore the
possibility that the desired suppression is a consequence of an additional,
spontaneously-broken, non-anomalous U(1) symmetry that is orthogonal to
hypercharge. We show that successful models can be constructed in which the
additional particle content necessary to cancel anomalies is minimal, and
compatible with the constraints from precision electroweak measurements and
gauge unification. If unification is sacrificed, and only the new U(1) and its
associated Higgs fields live in the bulk, it is possible that the gauge field
zero mode and first few Kaluza-Klein excitations lie within the kinematic reach
of the Tevatron. For gauge couplings not much smaller than that of hypercharge,
we show that these highly leptophobic states could evade detection at Run I,
but be discovered at Run II. Our scenario presents an alternative to the
`cartographic' solution to baryon number violation in which leptons and quarks
are separated in an extra dimension.


title:
Relic neutrino asymmetry generation from $\nu_{\alpha}- \nu_s$
  oscillations

abstract:
  Active--sterile neutrino oscillations provide a mechanism by which large
differences in the neutrino and antineutrino number densities can be created in
the early universe. The quantum kinetic equations are employed in the study of
these asymmetries, which, when solved analytically in the adiabatic limit,
generate physically transparent evolution equations that are very useful for
the understanding of the nature of the asymmetry growth.


title: W-Pair Production with YFSWW/KoralW

abstract:
  A theoretical description of W-pair production in terms of two complementary
Monte Carlo event generators YFSWWand KoralW is presented. The way to combine
the results of these two programs in order to get precise predictions for WW
physics at LEP2 and LC energies is discussed.


title:
QED Test at LEP200 Energies in the Reaction $\rm e^+ e^-\to \gamma\gamma
  (\gamma)$

abstract:
  The measurements of the QED reaction $ \EEGG $ performed with the L3 detector
are used to search for new physics phenomena beyond the Standard Model. No
evidence for these phenomena is found and new limits on their parameters are
set. First the reaction is used to constrain a model of an excited electron and
second to study contact interactions. The total and differential cross sections
for the process $ \EEGG $, are measured at energies from 91 GeV to 202 GeV
using the data collected with the L3 detector from 1991 to 1999. The L3 data
set lower limits on the mass of an excited electron $ \MESTAR > 402 $ GeV, on
the QED cutoff parameters $ \LAMP > 415 $ GeV, $ \LAMM > 258 $ GeV and on the
contact interaction energy scale $ \Lambda > 1687 $ GeV. The last parameter
limits the size of the interaction area to $ R < 1.17\times 10^{-17} $ cm. Some
limits on the string and quantum gravity scales are also discussed.


title: Supersymmetric origin of a low $a_{J/psi}$ CP asymmetry

abstract:
  We show that general Minimal Supersymmetric extensions of the Standard Model
(MSSM) allow for a CP asymmetry in B --> J/psi K(S) well bellow the SM
expectations with dominant Supersymmetric contributions to epsilon_K and
epsilon'/epsilon. Indeed, we provide an explicit example of an MSSM with
non-universal soft breaking terms fully consistent with the low results of this
asymmetry recently announced by Babar and Belle collaborations.


title: Electroweak preheating on a lattice

abstract:
  In many inflationary models, a large amount of energy is transferred rapidly
to the long-wavelength matter fields during a period of preheating after
inflation. We study how this changes the dynamics of the electroweak phase
transition if inflation ends at the electroweak scale. We simulate a classical
SU(2)xU(1)+Higgs model with initial conditions in which the energy is
concentrated in the long-wavelength Higgs modes. With a suitable initial energy
density, the electroweak symmetry is restored non-thermally but broken again
when the fields thermalize. During this symmetry restoration, baryon number is
violated, and we measure its time evolution, pointing out that it is highly
non-Brownian. This makes it difficult to estimate the generated baryon
asymmetry.


title:
Sharpening Low-Energy, Standard-Model Tests via Correlation Coefficients
  in Neutron Beta-Decay

abstract:
  The correlation coefficients a, A, and B in neutron beta-decay are
proportional to the ratio of the axial-vector to vector weak coupling
constants, g_A/g_V, to leading recoil order. With the advent of the next
generation of neutron decay experiments, the recoil-order corrections to these
expressions become experimentally accessible, admitting a plurality of Standard
Model (SM) tests. The measurement of both a and A, e.g., allows one to test the
conserved-vector-current (CVC) hypothesis and to search for second-class
currents (SCC) independently. The anticipated precision of these measurements
suggests that the bounds on CVC violation and SCC from studies of nuclear
beta-decay can be qualitatively bettered. Departures from SM expectations can
be interpreted as evidence for non-V-A currents.


title: Effects from the charm scale in K+ -> pi+ nu nubar

abstract:
  We consider contributions to the rare decay K+ -> pi+ nu nubar which become
nonlocal at the charm scale. Compared to the leading term, such amplitudes are
suppressed by two powers of mK/mc and could potentially give corrections at the
level of 15%. We compute the leading coefficients of the subleading dimension
eight operators in the effective theory below the charm mass. The matrix
elements of these operators cannot all be calculated from first principles and
some must be modeled. We find that these contributions are likely to be small,
but the estimate is sufficiently uncertain that the result may be as large as
the existing theoretical uncertainty from other sources.


title: Bounds on Universal Extra Dimensions

abstract:
  We show that the bound from the electroweak data on the size of extra
dimensions accessible to all the standard model fields is rather loose. These
"universal" extra dimensions could have a compactification scale as low as 300
GeV for one extra dimension. This is because the Kaluza-Klein number is
conserved and thus the contributions to the electroweak observables arise only
from loops. The main constraint comes from weak-isospin violation effects. We
also compute the contributions to the S parameter and the $Zb\bar{b}$ vertex.
The direct bound on the compactification scale is set by CDF and D0 in the few
hundred GeV range, and the Run II of the Tevatron will either discover extra
dimensions or else it could significantly raise the bound on the
compactification scale. In the case of two universal extra dimensions, the
current lower bound on the compactification scale depends logarithmically on
the ultra-violet cutoff of the higher dimensional theory, but can be estimated
to lie between 400 and 800 GeV. With three or more extra dimensions, the cutoff
dependence may be too strong to allow an estimate.


title:
Phenomenology of the Neutrino-Mass-Giving Higgs Triplet and the
  Low-Energy Seesaw Violation of Lepton Number

abstract:
  Small realistic Majorana neutrino masses can be generated via a Higgs triplet
$(\xi^{++}, \xi^+, \xi^0)$ without having energy scales larger than $M_*={\cal
O}(1)$ TeV in the theory. The large effective mass scale $\Lambda$ in the
well-known seesaw neutrino-mass operator $\Lambda^{-1} (LL\Phi\Phi)$ is
naturally obtained with $\Lambda\sim M_*^2/\mu,$ where $\mu$ is a {\it small}
scale of lepton-number violation. In theories with large extra dimensions, the
smallness of $\mu$ is naturally obtained by the mechanism of ``shining'' if the
number of extra dimensions $n\ge 3.$ We study here the Higgs phenomenology of
this model, where the spontaneous violation of lepton number is treated as an
external source from extra dimensions. The observable decays $\xi^{++} \to
l_i^+l_j^+$ will determine directly the magnitudes of the $\{ij\}$ elements of
the neutrino mass matrix. The decays $\xi^+ \to W^+ J^0$ and $\xi^0 \to Z J^0$,
where $J^0$ is the massless Goldstone boson (Majoron), are also possible, but
of special importance is the decay $\xi^0 \to J^0 J^0$ which provides stringent
constraints on the allowed parameter space of this model. Based on the current
neutrino data, we also predict observable rates of $\mu-e$ conversion in
nuclei.


title: Search for QGP and Thermal Freeze-out of Strange Hadrons

abstract:
  After reviewing the observables of QGP we perform an analysis of m_T spectra
of strange hadrons measured as function of centrality in 156AGeV Pb--Pb
interactions. We show that there is a good agreement between the chemical and
thermal freeze-out conditions, providing additional evidence for the formation
and sudden disintegration of a supercooled QGP fireball.


title: Viable Ultraviolet-Insensitive Supersymmetry Breaking

abstract:
  It is known that one can add D-term contributions for U(1)_Y and U(1)_{B-L}
to the anomaly-mediated supersymmetry breaking to make the superparticle
spectrum phenomenologically viable. We point out that this can be done without
spoiling its important virtue, namely the ultraviolet insensitivity. This
framework can be derived from supersymmetry breaking and U(1)_{B-L} breaking on
hidden brane(s).


title: From Hard to Soft Diffraction and Return

abstract:
  The long standing mystery of smallness of diffractive dissociation of hadrons
to large effective masses (the Pomeron-proton cross section is only 2 mb)
witnesses that the gluonic clouds of valence quarks are so small (r_0=0.3fm)
that soft interaction hardly resolves those gluons (diffraction is \propto
r_0^4). A color-dipole light-cone (LC) approach is developed which incorporates
a strong nonperturbative interaction of the LC gluons. The energy dependent
part of the total hadronic cross section is calculated in a parameter-free way
employing the nonperturbative LC wave functions of the quark-gluon Fock states.
It rises with energy as s^\Delta, and we predict \Delta=0.17 +/- 0.01, as well
as the normalization. However, the energy independent part of the cross section
related to inelastic collisions with no gluon radiated (gluons are not
resolved) cannot be calculated reliably and we treat it as an adjustable
parameter which is fixed fitting just one experimental point for total cross
section. Then the energy dependence of the total cross section (the Pomeron
part) and the elastic slope are fully predicted, as well as the effective
Pomeron trajectory in impact parameter space, in a good agreement with data.
These results naturally explain the x-dependence of the diffractive DIS
observed at HERA. Although diffraction is expected to be dominated by soft
interactions the observed effective \Delta is about twice as large as one
(0.08) known for total cross sections. Diffractive excitations of large
effective mass correspond to diffractive gluon radiation and should be
associated with our calculated \Delta.


title: $K^*(892)$ Electromagnetic Mass Anomaly

abstract:
  Electromagnetic masses of neutral $K^*(892)$ may be larger than one of
charged $K^*(892)$. It is unusual and is called $K^*$-EM-mass anomaly. We
review the studies on this issue, and point out that $K^*$-mass splitting can
be measured in BES accurately.


title:
Comparision of the Pion Emission Function in Hadron-Hadron and Heavy-Ion
  Collisions

abstract:
  Combining results on single-particle distributions with those of the
  Bose-Einstein correlation analysis in the same experiment, the space-time
emission function is extracted as a function of time and longitudinal
coordinate, as well as a function of transverse coordinates.
  While the former function resembles a boomerang for both types of collision
(only shifted in the time direction due to the larger freeze-out time in
heavy-ion collisions), the latter function is Gaussian for heavy-ion
collisions, but ring-shaped for hadron-hadron collisions.


title: Matter-antimatter domains in the universe

abstract:
  A possible existence of cosmologically large domains of antimatter or
astronomical ``anti-objects'' is discussed. A brief review of different
scenarios of baryogenesis predicting a noticeable amount of antimatter is
given. Though both theory and observations indicate that the universe is most
possibly uniformly charge asymmetric without any noticeable amount of
antimatter, several natural scenarios are possible that allow for
cosmologically (astronomically) interesting objects in close vicinity to us.
The latter may be discovered by observation of cosmic ray antinuclei.


title: Angular distributions in hard exclusive production of pion pairs

abstract:
  Using the leading order amplitudes of hard exclusive electroproduction of
pion pairs we have analyzed the angular distribution of the two produced
particles. At leading twist a pion pair can be produced only in an isovector or
an isoscalar state. We show that certain components of the angular distribution
only get contributions from the interference of the I=1 and the (much smaller)
I=0 amplitude. Therefore our predictions prove to be a good probe of isospin
zero pion pair production. We predict effects of a measurable size that could
be observed at experiments like HERMES. We also discuss how hard exclusive pion
pair production can provide us with new information on the effective chiral
Lagrangian.


title:
Measuring the Top Yukawa coupling to a heavy Higgs boson at future e+e-
  Linear Colliders

abstract:
  The determination of the Yukawa coupling of the top quark to the Higgs boson
is one of the most important measurements that a future e^+e^- linear collider
could provide. For a Higgs boson of mass greater than 350 GeV, this coupling
can be determined using the Higgs resonant contribution to t \bar t production
from W^+ W^- fusion at TeV energies. We have made a careful evaluation of the
significance with which the signal of a Higgs decaying to t \bar t pairs could
be observed at future e^+ e^- linear colliders, with center of mass energies
close to 1 TeV and an integrated luminosity of 1 ab^{-1}. We find that a signal
significance greater than 5 \sigma and a relative error in the top Yukawa
measurement better than 10% can be achieved, for Higgs masses in the 350-500
GeV and 350-650 GeV ranges at facilities with 800 GeV and 1 TeV energies
respectively.


title:
Testing Scalar-Sector CP Violation in Top-Quark Production and Decay at
  Linear e+e- Colliders

abstract:
  We consider a general two-Higgs-doublet model with CP violation in the scalar
sector. Three neutral Higgs fields of the model all mix and the resulting
physical Higgs bosons have no definite CP properties. That leads, at the
one-loop level of the perturbation expansion, to CP-violating form factors for
gamma-t-tbar, Z-t-tbar and W-t-b interaction vertices. We discuss asymmetries
sensitive to CP violation induced by the form factors for the process e^+ e^-
-> t tbar -> l^\pm ... and e^+ e^- -> t tbar -> b/bbar ... at future linear e+
e- colliders.


title:
Gluon distribution at moderately low-x from NMC deuteron structure
  function data

abstract:
  We present some simple methods to find gluon distribution from analysis of
deuteron F_{2} structure function data at moderately low-x. Here we use the
leading order(LO) Altarelli -Parisi(AP) evolution equation and New Muon
Collaboration (NMC) deuteron F_{2} structure function data to extract gluon
distribution. We also compare our results with those of other authors.


title: Baryon stopping in high energy collisions in the DPMJET-III model

abstract:
  A new striking feature of hadron production in nuclear collisions is the
large stopping of the participating nucleons in hadron-nucleus and
nucleus-nucleus collisions. This enhanced baryon stopping can be understood
introducing new diquark breaking mechanisms in multistring models of hadron
production. Here we discuss the implementation of these diagrams into the
DPMJET-III hadronic Monte Carlo model.


title:
Supersymmetric penguin contributions to the decay b -> s gamma with
  non-universal squarks masses

abstract:
  We give explicit expressions for the amplitudes associated with the
supersymmetric contributions to the process: b -> s gamma in the context of
SUSY extensions of Standard Model with non-universal soft SUSY breaking terms.
  From experimental data, we deduce the limits on the squark mass insertions
obtained from different contributions (gluinos, neutralinos and charginos).


title:
Leading Isgur-Wise form factor of $\Lambda_b\to\Lambda_{c1}$ transition
  using QCD sum rules

abstract:
  The leading Isgur-Wise form factor $\xi(y)$ parametrizing the semileptonic
transitions $\Lambda_b\to\Lambda^{1/2}_{c1}\ell\bar\nu$ and
$\Lambda_b\to\Lambda^{3/2}_{c1}\ell\bar\nu$ is calculated by using the QCD sum
rules in the framework of heavy quark effective theory, where
$\Lambda^{1/2}_{c1}$ and $\Lambda^{3/2}_{c1}$ is the orbitally excited charmed
baryon doublet with $J^P=(1^-/2,3^-/2)$. The interpolating currents with
transverse covariant derivative are adopted for $\Lambda^{1/2}_{c1}$ and
$\Lambda^{3/2}_{c1}$ in the analysis. The slope parameter $\rho^2$ in linear
approximation of the Isgur-Wise function is obtained to be $\rho^2=2.01$, and
the interception to be $\xi(1)=0.29$. The decay branching ratios are estimated.


title: Chiral Quark Model with Configuration Mixing

abstract:
  The implications of one gluon exchange generated configuration mixing in the
Chiral Quark Model ($\chi$QM$_{gcm}$) with SU(3) and axial U(1) symmetry
breakings are discussed in the context of proton flavor and spin structure as
well as the hyperon $\beta$-decay parameters. We find that $\chi$QM$_{gcm}$
with SU(3) symmetry breaking is able to give a satisfactory unified fit for
spin and quark distribution functions, with the symmetry breaking parameters
$\alpha=.4$, $\beta=.7$ and the mixing angle $\phi=20^o$, both for NMC and the
most recent E866 data. In particular, the agreement with data, in the case of
$G_A/G_V, \Delta_8$, F, D, $f_s$ and $f_3/f_8$, is quite striking.


title: $c\to u\gamma$ in the minimal supersymmetric standard model

abstract:
  The minimal supersymmetric standard model (MSSM) with universal soft breaking
terms has a negligible effect on the rare $c\to u\gamma$ decay rate. We
therefore study a general model with non-universal soft breaking terms
constrained by vacuum stability and the experimental upper bound on the mass
difference of the neutral charm mesons. It turns out that gluino exchange can
enhance the standard model rate by up to two orders of magnitudes; in contrast,
the contributions from charginos and neutralinos remain at least an order of
magnitude below the QCD corrected standard model rate.


title: The Extended Chiral Quark Model in a Tamm-Dancoff Inspired Approximation

abstract:
  A procedure inspired by the Tamm-Dancoff method is applied to the chiral
quark model which has been extended to include additional degrees of freedom: a
pseudoscalar isoscalar field as well as a triplet of scalar isovector fields.
The simpler, generic $\sigma$ -- model has been used before as a test for the
Tamm-Dancoff inspired approximation (TDIA). The extended chirial quark model is
employed here to investigate possible novel effects of the additional degrees
of freedom as well as to point out the necessesity to introduce a SU(3)
flavour. Model predictions for the axial-vector coupling constant and for the
nucleon magnetic moment obtained in TDIA are compared with experimental values.


title: Variations on Supersymmetry Breaking and Neutrino Spectra

abstract:
  The problem of generating light neutrinos within supersymmetric models is
discussed. It is shown that the hierarchy of scales induced by supersymmetry
breaking can give rise to suppression factors of the correct order of magnitude
to produce experimentally allowed neutrino spectra.


title: Lepton-Flavour Violation in Vector Boson Decays

abstract: This paper is subsumed and superseded by hep-ph/0111175.


title: The s-sbar and K-Kbar nature of f_0(980) in D_s decays

abstract:
  We examine the D_s -> f_0(980) pi amplitude through a constituent quark-meson
model, incorporating heavy quark and chiral symmetries, finding a good
agreement with the recent E791 data analysis of D_s -> 3pi via f_0(980). The
f_0(980) resonance is considered at the moment of production as an s sbar
state, later evolving to a superposition of mainly s sbar and K Kbar. The
analysis is also extended to the more frequent process D_s -> phi pi.


title: An Alternative Method to Obtain the Quark Polarization of the Nucleon

abstract:
  An alternate method is described to extract the quark contribution to the
spin of the nucleon directly from the first moment of the deuteron structure
function, $g^d_1$. It is obtained without recourse to the use of input on the
nucleon wave function from hyperon decays involving the flavor symmetry
parameters, F and D. The result for the quark polarization of the nucleon,
$\Delta\Sigma_ N,$ is in good agreement with the values of the singlet axial
current matrix element, $a_0$, obtained from recent next-to-leading order
analyses of current proton, neutron and deuteron data.


title:
Precise calculation of neutralino relic density in the minimal
  supergravity model

abstract:
  We study precise calculation of neutralino relic density in the minimal
supergravity model. We compare the exact formula for the thermal average of the
neutralino annihilation cross section times relative velocity with the
expansion formula in terms of the temperature, including all the contributions
to neutralino annihilation cross section analytically. We confirm that the
expansion formula fails badly near s-channel poles. We show that the expansion
method causes 5-10 % error even far away from the poles.


title: The b-quark EDM in SUSY and CP-odd bottomonium formation

abstract:
  We compute the electric dipole moment (EDM) of the bottom quark in minimal
supersymmetric model (SUSY) with explicit CP violation. We estimate its upper
bound to be 10^(-20) e-cm where the dominant contribution comes from the
charginos for most of the SUSY parameter space. We also find that chargino
contribution is directly correlated with the branching fraction of the B\to X_s
\gamma decay. Furthermore, we analyze the formation of 1 P_1 resonance of the
(\bar{b}b) system in e^+ e^- annihilation, and show that the CP-violating
transition amplitude, induced solely by the b-quark EDM, is significantly
larger than the CP-conserving ones. Therefore, observation of this CP-odd
resonance in e^+ e^- annihilation will be a direct probe of the CP-violating
phases in SUSY. In case experiment cannot establish the existence of such a
CP-odd (\bar{b}b) state, then either sparticle masses of all three generations
will be pushed well above TeV, weakening the possibility of weak-scale SUSY, or
the sparticle mass spectrum will be tuned so as to cancel different
contributions to EDMs.


title: Coherent Exclusive Exponentiation for Precision Monte Carlo Calculations

abstract:
  In this contribution we give a short overview of the new Coherent Exclusive
Exponentiation (CEEX) which is implemented in the new \KK MC event generator
for the process $e^+e^-\to f\bar{f} +n\gamma$, $f=\mu,\tau,d,u,s,c,b$ with
validity for center of mass energies from $\tau$ lepton threshold to 1TeV, that
is for LEP1, LEP2, SLC, future Linear Colliders, $b,c,\tau$-factories etc. In
CEEX effects due to photon emission from initial beams and outgoing fermions
are calculated in QED up to second-order, including all interference effects.
Electroweak corrections are included in first-order, at the amplitude level.
Beams can be polarized longitudinally and transversely, and all spin
correlations are incorporated in an exact manner. We describe briefly the
essence of CEEX as compared with older exclusive variants of the exponentiation
(EEX) and present samples of the numerical results, concentrating on the
question of the technical and physical precision for the total cross section
and for the charge asymmetry. New results on the interference between initial
and final state photon emission at LEP2 energies are also shown.


title: Triplet-doublet Splitting, Proton Stability and Extra Dimension

abstract:
  We propose a new possibility to reconcile the coupling unification scenario
with the triplet-doublet mass splitting based on a 5-dimensional supersymmetric
model with SU(5) gauge symmetry. It is shown that the minimal supersymmetric
standard model is derived on a 4-dimensional wall through compactification on
$S^1/(Z_2 \times Z_2')$.


title: Comment about pion electro-production and the axial form factors

abstract:
  The claim by Haberzettl (Phys.Rev.Lett.85 (2000) 3576) that the axial form
factor of the nucleon cannot be accessed through threshold pion
electroproduction is unfounded.


title:
Simple solutions of fireball hydrodynamics for self-similar elliptic
  flows

abstract:
  Simple, self-similar, elliptic solutions of non-relativistic fireball
hydrodynamics are presented, generalizing earlier results for spherically
symmetric fireballs with Hubble flows and homogeneous temperature profiles. The
transition from one dimensional to three dimensional expansions is investigated
in an efficient manner.


title:
Mass of the $\eta'$ meson in the chiral limit in the zero momentum modes
  enhancement quantum model of the QCD nonperturbative vacuum

abstract:
  Using the trace anomaly and low energy relations, as well as the
Witten-Veneziano formula for the mass of the $\eta'$ meson, we have developed a
formalism which makes it possible to express the gluon condensate, the
topological susceptibility and the mass of the $\eta'$ meson as a functions of
the truly nonperturbative vacuum energy density which is one of the most
important characteristics of the QCD true ground state. It was directly applied
to the numerical evaluation of the chiral QCD vacuum topological structure
within its quantum zero momentum modes enhancement model. A rather good
agreement with phenomenological and experimental values of the above-mentioned
quantities has been achieved. With the help of the Witten-Veneziano formula, we
derived an absolute lower bounds for the pion decay constant and the mass of
the $\eta'$ meson in the chiral limit. By introducing the most general
parametrization of the gluon condensate, we also proposed how the correct $N_f$
(number of flavors) dependence of its phenomenologically extracted value could
be restored.


title:
Systematics of one-loop Yang-Mills diagrams from bosonic string
  amplitudes

abstract:
  We present a general algorithm to compute off-shell, one-loop multigluon
Green functions using bosonic string amplitudes. We identify and parametrize
the regions in the space of moduli of one-loop Riemann surfaces that contribute
to the field theory limit of string amplitudes. Each of these regions can be
precisely associated with a Feynman-like scalar graph with cubic and quartic
vertices, whose lines represent the joint propagation of ghosts and gluons. We
give a procedure to compute the contribution of each graph to a gluon Green
function, for arbitrarily polarized off-shell gluons, reducible and irreducible
diagrams, planar and non-planar topologies. Explicit examples are given for up
to six gluons.


title: Four--Neutrino Oscillations at SNO

abstract:
  We discuss the potential of the Sudbury Neutrino Observatory (SNO) to
constraint the four--neutrino mixing schemes favoured by the results of all
neutrino oscillations experiments. Our results show that some information on
the value of $\cos^2(\vartheta_{23}) \cos^2(\vartheta_{24})$ can be obtained by
the first SNO measurement of the CC ratio, while considerable improvement on
the knowledge of this mixing will be achievable after the measurement of the
NC/CC ratio.


title:
Testing CPT invariance by using C-even neutral-meson--antimeson
  correlated states

abstract:
  We consider the decays of a correlated neutral-meson--antimeson state with
C-parity +1. We show that there is CPT noninvariance in the mixing of the
neutral mesons if, for any two decay modes f and g, the decay rate has a
component R_A which is antisymmetric under the interchange of the decay times
t_1 and t_2. In particular, one may cleanly extract the CPT-noninvariance
parameter with the help of R_A by using opposite-sign dilepton events.


title:
The photon structure and exclusive production of vector mesons in
  gamma-gamma collisions

abstract:
  The process of exclusive vector meson production (gamma gamma to J/psi rho^0)
is studied for almost real photons. This process may be reduced to
photoproduction of J/psi off the rho^0 meson. We discuss the possibility of
extracting the gluon distribution of rho^0 and of the photon from such
measurement. Predictions are also given for the reaction (e+e- to e+ e- J/psi
rho^0) for various e+e- cms energies typical for LEP and for the future linear
colliders.


title: Hyperon Beta-Decay Analysis and the Recent KTeV Data

abstract:
  The analysis of hyperon semi-leptonic decay data is addressed with reference
to SU(3) breaking and isospin mixing between Lambda^O and Sigma^O. Various
approaches to SU(3) breaking are discussed and compared. The phenomenological
implications of Lambda^0-Sigma^0 mixing are not to be underestimated: it can
induce vector couplings in decays otherwise purely axial and may also modify
rates. In regard of the KTeV data on Xi^0O -> Sigma^+ e antineutrino,
predictions are presented and the impact of present a future data on the
extraction of F and D is also examined. In addition, the implications of the
new data for the use of octet baryon beta decays in determining V_us are
considered.


title: Large lepton mixing and supernova 1987A

abstract:
  We reconsider the impact of $\bar\nu_e \leftrightarrow \bar\nu_{\mu,\tau}$
neutrino oscillations on the observed $\bar\nu_e$ signal of supernova SN 1987A.
Performing a maximum-likelihood analysis using as fit parameters the released
binding energy $\Eb$ and the average neutrino energy $\Ee$, we find as previous
analyses that $\bar\nu_e \leftrightarrow \bar\nu_{\mu,\tau}$ oscillations with
large mixing angles have lower best-fit values for $\Ee$ than small-mixing
angle (SMA) oscillations. Moreover, the inferred value of $\Ee$ is already in
the SMA case lower than those found in simulations. This apparent conflict has
been interpreted as evidence against the large mixing oscillation solutions to
the solar neutrino problem. In order to quantify the degree to which the
experimental data favour the SMA over the large mixing solutions we use their
likelihood ratios as well as a Kolmogorov-Smirnov test. We find within the
range of SN parameters predicted by simulations regions in which the LMA-MSW
solution is either only marginally disfavoured or favoured compared to the
SMA-MSW solution. We conclude therefore that the LMA-MSW solution is not in
conflict with the current understanding of SN physics. In contrast, the vacuum
oscillation and the LOW solutions to the solar neutrino problem can be excluded
at the $4\sigma$ level for most of the SN parameter ranges found in
simulations. Only a marginal region with low values of $\Ee$,
$<E_{\bar\nu_{\mu,\tau}}>$ and $\Eb$ is left over, in which these oscillation
solutions can be reconciled with the neutrino signal of SN 1987A.


title: Fourth generation effects in the $B_s \to \nu \bar{\nu} \gamma$ decay

abstract:
  If the fourth generation fermions exist, the new quarks could influence the
branching ratio of the decay $B_s \to \nu \bar{\nu} \gamma$. We obtain two
solutions of the fourth generation CKM factor $V^*_{t's} V_{t'b}$ from the
decay of $B \to X_s \gamma$. With these two solutions we calculate the new
contributions of the fourth generation quark to Wilson coefficients of the
decay $B_s \to \nu \bar{\nu} \gamma$. The branching ratio of the decay $B_s \to
\nu \bar{\nu} \gamma$ in the two cases are calculated. In one case, our results
are quite different from that of SM, but almost same in another case. If a
fourth generation should exist in nature and nature chooses the former case,
this B meson decay could provide a possible test of the fourth generation
existence.


title: DVCS on the nucleon : study of the twist-3 effects

abstract:
  We estimate the size of the twist-3 effects on deeply virtual Compton
scattering (DVCS) observables, in the Wandzura-Wilczek approximation. We
present results in the valence region for the DVCS cross sections, charge
asymmetries and single spin asymmetries, to twist-3 accuracy.


title: Elliptic flow at SPS and RHIC: from kinetic transport to hydrodynamics

abstract:
  Anisotropic transverse flow is studied in Pb+Pb and Au+Au collisions at SPS
and RHIC energies. The centrality and transverse momentum dependence at
midrapidity of the elliptic flow coefficient v_2 is calculated in the
hydrodynamic and low density limits. Hydrodynamics is found to agree well with
the RHIC data for semicentral collisions up to transverse momenta of 1-1.5
GeV/c, but it considerably overestimates the measured elliptic flow at SPS
energies. The low density limit LDL is inconsistent with the measured magnitude
of v_2 at RHIC energies and with the shape of its p_t-dependence at both RHIC
and SPS energies. The success of the hydrodynamic model points to very rapid
thermalization in Au+Au collisions at RHIC and provides a serious challenge for
kinetic approaches based on classical scattering of on-shell particles.


title: Excited Heavy Baryons and Their Symmetries II: Effective Theory

abstract:
  We develop an effective theory for heavy baryons and their excited states.
The approach is based on the contracted O(8) symmetry recently shown to emerge
from QCD for these states in the combined large N_c and heavy quark limits. The
effective theory is based on perturbations about this limit; a power counting
scheme is developed in which the small parameter is lambda^{1/2} where lambda ~
1/N_c, Lambda /m_Q (with Lambda being a typical strong interaction scale). We
derive the effective Hamiltonian for strong interactions at next-to-leading
order. The next-to-leading order effective Hamiltonian depends on only two
parameters beyond the known masses of the nucleon and heavy meson. We also show
that the effective operators for certain electroweak transitions can be
obtained with no unknown parameters at next-to-leading order.


title: On Possibility of Decoherence in Correlated two Neutral Kaon Systems

abstract:
  We point out that decoherence parameters in the correlated two neutral kaon
system breaks the transformation invariance of basis and their magnitude are
stringently limited by the experimentally measured magnitudes of CP violation
and of the strangeness non conserving $\Delta S = \pm 2$ transitions.


title:
Perturbative QCD factorization of $\pi \gamma^*\to \gamma(\pi)$ and
  $B\to \gamma(\pi)l\bar \nu$

abstract:
  We prove factorization theorem for the processes $\pi\gamma^*\to\gamma$ and
$\pi\gamma^*\to\pi$ to leading twist in the covariant gauge by means of the
Ward identity. Soft divergences cancel and collinear divergences are grouped
into a pion wave function defined by a nonlocal matrix element. The gauge
invariance and universality of the pion wave function are confirmed. The proof
is then extended to the exclusive $B$ meson decays $B\to\gamma l\bar\nu$ and
$B\to\pi l\bar\nu$ in the heavy quark limit. It is shown that a light-cone $B$
meson wave function, though absorbing soft dynamics, can be defined in an
appropriate frame. Factorization of the $B\to\pi l\bar\nu$ decay in $k_T$
space, $k_T$ being parton transverse momenta, is briefly discussed. We comment
on the extraction of the leading-twist pion wave function from experimental
data.


title: Brane preheating

abstract:
  We study brane-world preheating in massive chaotic inflationary scenario
where scalar fields are confined on the 3-brane. Assuming that quadratic
contribution in energy densities dominates the Hubble expansion rate during
preheating, the amplitude of inflaton decreases slowly relative to the standard
dust-dominated case. This leads to an efficient production of $\chi$ particles
via nonperturbative decay of inflaton even if its coupling is of order
$g=10^{-5}$. We also discuss massive particle creation heavier than inflaton,
which may play important roles for the baryo- and lepto-genesis scenarios.


title: Dynamics of Symmetry Breaking and Tachyonic Preheating

abstract:
  We reconsider the old problem of the dynamics of spontaneous symmetry
breaking using 3d lattice simulations, and develop a theory of tachyonic
preheating, which occurs due to the spinodal instability of the scalar field.
Tachyonic preheating is so efficient that symmetry breaking typically completes
within a single oscillation of the field distribution as it rolls towards the
minimum of its effective potential. As an application of this theory we
consider preheating in the hybrid inflation scenario, including SUSY-motivated
F-term and D-term inflationary models. We show that preheating in hybrid
inflation is typically tachyonic and the stage of oscillations of a homogeneous
component of the scalar fields driving inflation ends after a single
oscillation. Our results may also be relevant for the theory of the formation
of disoriented chiral condensates in heavy ion collisions.

categories: hep-ph astro-ph cond-mat.stat-mech gr-qc hep-lat hep-th nlin.CD nlin.PS physics.comp-ph


title:
Hadronic final state predictions from CCFM: the hadron-level Monte Carlo
  generator CASCADE

abstract:
  We discuss a practical formulation of backward evolution for the CCFM
small-$x$ evolution equation and show results from its implementation in the
new Monte Carlo event-generator CASCADE.


title:
Gauge bosons in an SU(2)right x SU(2)left x G(leptonique) electroweak
  model

abstract:
  By considering its generalization to composite J=0 mesons proposed in a
previous work [1], I show how and why a chiral extension of the
Glashow-Salam-Weinberg standard model of electroweak interactions calls, there,
for right-handed charged W_R's coupled with g_R = e/cos(theta_W), and the
masses of which are related to the ones of the left-handed W_L's through the
relation M_L^2 + M_R^2 = M_Z^2. The mesonic sector, having vanishing baryonic
and leptonic number, is neutral with respect to the corresponding U(1)
symmetries, making the natural chiral gauge group to be [SU(2)left x
SU(2)right], blind to the presence of extra Z's. The W_R gauge bosons cannot
have been detected in hadronic colliders and can be very elusive in electroweak
processes involving, in particular, pseudoscalar mesons. Present data select
one among two possible extensions for which, in the right sector: - a specific
breaking of universality occurs between families of quarks, which belong to
inequivalent representations of SU(2)right; - the mixing angle is a free
parameter, constrained to be smaller than the Cabibbo angle by the box diagrams
controlling the K_L-K_S mass difference; this also minimizes contributions to
muon -> electron + photon. The relation g_L^2/M_L^2 = g_R^2/M_R^2 implements
left-right symmetry for low energy charged effective weak interactions. For the
sake of simplicity, this study is performed for two generations only.


title:
Flavour-Dependent CP Violation and Natural Suppression of the Electric
  Dipole Moments

abstract:
  We revisit the supersymmetric CP problem and find that it can be naturally
resolved if the origin of CP violation is closely related to the origin of
flavour structures. In this case, the supersymmetry breaking dynamics do not
bring in any new CP-violating phases. This mechanism requires hermitian Yukawa
matrices which naturally arise in models with a U(3) flavour symmetry. The
neutron electric dipole moment (NEDM) is predicted to be within one-two orders
of magnitude below the current experimental limit. The model also predicts a
strong correlation between A_{CP}(b --> s gamma)and the NEDM. The strong CP
problem is mitigated although not completely solved.


title: Light-light and heavy-light mesons spectra from nonperturbative QCD

abstract:
  Properties of light-light mesons are described by the effective Hamiltonian
with spinless quarks derived from QCD. The spectrum is computed by the WKB
method and shown to reproduce the celebrated linear Regge trajectories even for
the lowest levels. The correct string slope of the trajectories naturally
appears in the present approach as the string dynamics is taken into account
properly.
  Similar method is applied to heavy-light mesons and a set of corrections to
the Hamiltonian is taken into account including spin-spin and Tomas spin-orbit
interactions. The numerical results for the spectrum are compared with the
experimental data and with the results of recent lattice calculations.


title: Strong hadronic decays in QCD_2

abstract:
  Strong hadronic decays are discussed in the 't Hooft model for the
two-dimensional QCD in the limit of infinite number of colours. Adler
selfconsistency condition is derived for decays with pions in the final state
and the corresponding amplitude is demonstrated to vanish identically in the
chiral limit.


title: Soft photon emission as a sign of sharp transition in quark-gluon plasma

abstract:
  Photon emission arising in the course of transition between the states of
quark-gluon and hadron plasma has been considered. Single-photon distributions
and two-photon correlations in central rapidity region have been calculated for
heavy ion collisions at high energies. It has been found that opposite side
two-photon correlations can serve as a sign of sharp transitions between the
states of strongly interaction matter.


title: Physics Aspects of the CERN Heavy-Ion Programme

abstract:
  Statistical calculations within the Standard Model indicate that at extremely
high densities the quarks and gluons will become deconfined, leading to a new
state of matter, the so-called Quark-Gluon Plasma (QGP). Recently it was
announced at CERN that compelling evidence has been obtained from experimental
data that indeed the formation of a deconfined state has been achieved in very
energetic collisions of heavy nuclei. In this presentation I will provide an
overview of the main aspects of heavy-ion physics and will address the various
observations which indicate the possible creation of a deconfined state. To
enable a systematic study of the QGP state, a combined measurement of the
various observables is needed. It will be shown how this can be realised within
the ALICE experiment at the future LHC collider.


title: Sgoldstino events in top decays at LHC

abstract:
  We study top-quark decays in models with light sgoldstinos. The off-diagonal
entries in the squark mass matrices can lead to FCNC top two-body decays into
sgoldstinos and u(c) quarks. We compute the rates for these decays and discuss
the corresponding signatures that could manifest the presence of sgoldstinos in
top decays at LHC. We expect that a supersymmetry breaking scale $\sqrt{F}$ up
to a scale of order 10 TeV could be probed through this process, for a maximal
squark mixing with the third generation. Justified by our preliminary analysis,
a thorough study of the corresponding signal versus background and systematics
in the LHC environment would be most welcome, in order to accurately assess the
potential of this promising process in determining $\sqrt{F}$.


title: Classical and Quantum Brane Cosmology

abstract:
  The first part of this lecture quickly touches upon some important but
infrequently discussed issues in large extra dimension and warped extra
dimension scenarios, with particular reference to effects in the early
universe. The second part discusses a modification and extension of an earlier
proposal by Brown and Teitelboim to relax the effective cosmological term by
nucleation of fundamental membranes.


title: Analysis of B-> \phi K Decays in QCD Factorization

abstract:
  We analyze the decay $B\to \phi K$ within the framework of QCD-improved
factorization. We found that although the twist-3 kaon distribution amplitude
dominates the spectator interactions, it will suppress the decay rates
slightly. The weak annihilation diagrams induced by $(S-P)(S+P)$ penguin
operators, which are formally power-suppressed by order $(\Lambda/m_b)^2$, are
chirally and logarithmically enhanced. Therefore, these annihilation
contributions are not subject to helicity suppression and can be sizable. The
predicted branching ratio of $B^-\to\phi K^-$ is $(3.8\pm0.6)\times 10^{-6}$ in
the absence of annihilation contributions and it becomes
$(4.3^{+3.0}_{-1.4})\times 10^{-6}$ when annihilation effects are taken into
account. The prediction is consistent with CLEO and BaBar data but smaller than
the BELLE result.


title: CP-violation in 3- and 4-family at the Neutrino Factory

abstract:
  The leptonic CP-violating phase $\delta$ can be measured with a Neutrino
Factory with $2 \times 10^{20} $ useful muons per year, if the solar neutrino
problem is solved by the LMA-MSW solution, with $\Delta m_{12}^2 \ge 2 \times
10^{-5}$ eV$^2$ (in this analysis a 40 kT magnetized iron detector is
considered, taking into account its efficiencies and backgrounds). If LSND is
confirmed, CP-violating phenomena in four-family scenarios can be most easily
addressed with a small 1 kT detector at $L = \cal O$(10) km (no detailed
analysis of the detector efficiencies and backgrounds has been performed in
this case).


title: B-\bar{B} Mixing and b Hadron Lifetimes from Lattice QCD

abstract:
  We discuss neutral B_{s,d} meson mixing and b-hadron lifetimes from the
perspective of recent lattice calculations. In particular, we consider matrix
elements which can be combined with measured \Delta M_{s,d} to constrain
|V_{td}|, the lifetime ratios \tau(\Lambda_b)/\tau(B_d) and \tau(B^-)/\tau(B_d)
and the lifetime difference, \Delta\Gamma_s/\Gamma_s, in the neutral B_s meson
system.


title:
What if the Mass Difference $\Delta M_s$ is around 18 Inverse
  Picoseconds?

abstract:
  Present experiments in pursuit of the mass difference in the Bs-Bs(bar)
system have put a lower bound on this quantity of $\Delta M_s > 14.9 ps^{-1}$
(at 95% C.L.). The same experiments also yield a local minimum in the
log-likelihood function around $\Delta M_s = 17.7 ps^{-1}$, which is
$2.5\sigma$ away from being zero. Motivated by these observations, we
investigate the consequences of a possible measurement of $\Delta M_s = 17.7
\pm 1.4 ps^{-1}$, in the context of both the standard model and supersymmetric
models with minimal flavor violation. We perform a fit of the quark mixing
parameters in these theories and estimate the expected ranges of the CP
asymmetries in B decays, characterized by $\alpha$, $\beta$ and $\gamma$, the
interior angles of the CKM-unitarity triangle. Based on this study, we argue
that, if indeed $\Delta M_s$ turns out to be in its currently-favored range,
this would disfavor a large class of supersymmetric models. Indeed, of all the
models examined here, the best fit to the data occurs for the standard model.


title:
Phenomenological study of the interactions violating the R-parity
  symmetry in the supersymmetric theories

abstract:
  The supersymmetric extension of the Standard Model can contain interactions
violating the so-called R-parity symmetry. Such couplings would lead to the
lepton and/or baryon number violation and modify deeply the phenomenology of
supersymmetry at future particle colliders. We have worked out tests of the
R-parity violating interactions. First, we have studied clear signals of the
single production of supersymmetric partners of the Standard Model particles,
which involves the R-parity violating interactions, in the context of physics
at next leptonic and hadronic colliders. The results show that strong
sensitivities could be obtained on the soft supersymmetry breaking parameters
and indicate the possibility of an improvement of one to two order of magnitude
concerning the present indirect limits on the values of several R-parity
violating coupling constants. Besides, it has been verified that the single
superpartner production analysis offers the opportunity to reconstruct in a
model independent way some superpartner masses with an high accuracy. Secondly,
we have studied CP symmetry violation effects, due to the complex phases of
R-parity violating coupling constants, in the pair production of either
fermions or sfermions of different flavors at future leptonic colliders. We
have seen notably that the single top quark production allows to test the CP
violation in the hadronic sector. The main conclusion of these works is that
complex phases of certain R-parity violating coupling constants could be
observed, and in particular within a scenario where those couplings would
exhibit a strong hierarchy in flavor space.


title:
Resummation of Yukawa enhanced and subleading Sudakov logarithms in
  longitudinal gauge boson and Higgs production

abstract:
  Future colliders will probe the electroweak theory at energies much larger
than the gauge boson masses. Large double (DL) and single (SL) logarithmic
virtual electroweak Sudakov corrections lead to significant effects for
observable cross sections. Recently, leading and subleading universal
corrections for external fermions and transverse gauge boson lines were
resummed by employing the infrared evolution equation method. The results were
confirmed at the DL level by explicit two loop calculations with the physical
Standard Model (SM) fields. Also for longitudinal degrees of freedom the
approach was utilized for DL-corrections via the Goldstone boson equivalence
theorem. In all cases, the electroweak Sudakov logarithms exponentiate. In this
paper we extend the same approach to both Yukawa enhanced as well as subleading
Sudakov corrections to longitudinal gauge boson and Higgs production. We use
virtual contributions to splitting functions of the appropriate Goldstone
bosons in the high energy regime and find that all universal subleading terms
exponentiate. The approach is verified by employing a non-Abelian version of
Gribov's factorization theorem and by explicit comparison with existing one
loop calculations. As a side result, we obtain also all top-Yukawa enhanced
subleading logarithms for chiral fermion production at high energies to all
orders. In all cases, the size of the subleading contributions at the two loop
level is non-negligible in the context of precision measurements at future
linear colliders.


title:
Analysis of the atmospheric neutrino data in terms of 3-neutrino
  oscillations

abstract:
  A global analysis of atmospheric and reactor neutrino data is presented in
terms of three-neutrino oscillations. We consider in our analysis both
contained events and upward-going neutrino-induced muon events, including the
previous data samples of Frejus, IMB, Nusex, and Kamioka experiments as well as
the full 71 kton-yr (1144 days) Super-Kamiokande data set, the recent 5.1
kton-yr contained events of Soudan-2 and the results on upgoing muons from the
MACRO detector. After presenting the results for the analysis of atmospheric
data alone, we add to our data sample the reactor bound of the CHOOZ
experiment, showing and important complementarity between the atmospheric and
reactor limits which results in a stronger constraint on the allowed value of
theta_13.


title: Violations of Lorentz Covariance in Light Front Quark Models

abstract:
  Electromagnetic form factors of the nucleon from relativistic quark models
are analyzed: results from null-plane projection of the Feynman triangle
diagram are compared with a Bakamjian-Thomas model. The magnetic form factors
of the models differ by about 15% at spacelike momentum transfer 0.5 GeV^2,
while the charge form factors are much closer. Spurious contributions to
electromagnetic form factors due to violations of rotational symmetry are
eliminated from both models. One method changes magnetic form factors by about
10%, whereas the charge form factors stay nearly the same. Another one changes
the charge form factor of the Bakamjian-Thomas model by more than 50%.


title: Counting Form Factors of Twist-Two Operators

abstract:
  We present a simple method to count the number of hadronic form factors based
on the partial wave formalism and crossing symmetry. In particular, we show
that the number of independent nucleon form factors of spin-n, twist-2
operators (the vector current and energy-momentum tensor being special
examples) is n+1. These generalized form factors define the generalized
(off-forward) parton distributions that have been studied extensively in the
recent literature. In proving this result, we also show how the J^{PC} rules
for onium states arise in the helicity formalism.


title:
Heavy Flavour Physics: On Its More Than 50 Years Of History, Its Future
  And The Rio Manifesto

abstract:
  After a reminder about how $\Delta S\neq 0$ physics has been instrumental for
the development of the Standard Model I sketch theoretical technologies for
dealing with nonperturbative QCD in heavy flavour decays and state predictions
for CP odd effects as they were made in 1998. I review the exciting
developments in heavy flavour physics as presented at this conference. A
central message is presented in the `Rio Manifesto' where I recapitulate the
lessons we have learnt from charm physics, point out the special role future
dedicated charm studies can play in revealing the presence of New Physics and
give an introduction to the relevant phenomenology focussed on CP studies.


title: Conference Summary - Beauty 2000

abstract:
  I discuss some key issues covered at the Conference including physics goals,
current results on CKM angles, rare decays, status of $|V_{cb}|$ and
$|V_{ub}|$, CKM fits and progress on hardware.


title: Net-baryon scaling near the QCD critical point

abstract:
  The net-baryon density at midrapidity is proposed as an order parameter in
the search for the QCD critical point in heavy ion collisions. As a function of
the initial energy and the total number of participants, this quantity obeys a
scaling law, dictated by the critical exponents of the appropriate universality
class. The corresponding scaling variable specifies the proximity of a given
experiment to the critical point. Within this framework, measurements at the
SPS are discussed and predictions for RHIC and LHC are extracted.


title: Pion production from a critical QCD phase

abstract:
  A theoretical scheme which relates multiparticle states generated in
ultrarelativistic nuclear collisions to a QCD phase transition is considered in
the framework of the universality class provided by the 3-D Ising model. Two
different evolution scenarios for the QGP system are examined. The statistical
mechanics of the critical state is accounted for in terms of (critical) cluster
formation consistent with suitably cast effective action functionals, one for
each considered type of expansion. Fractal properties associated with these
clusters, characterizing the density fluctuations near the QCD critical point,
are determined. Monte-Carlo simulations are employed to generate events,
pertaining to the total system, which correspond to signals associated with
unconventional sources of pion production.


title: Weakly Warped Extra Dimensions and SN1987A

abstract:
  The neutrino pulse from SN1987A provides one of the most rigourous
constraints on models of extra dimensions. Previously, calculations have been
done to bound the size of these extra dimensions in the case when the metric
was factorizable. Here we consider the case of 2 `weakly warped' extra
dimensions. We find that even though weak warping seems only to affect the zero
mode this can have a measurable effect on the supernovae bounds. In any
braneworld model such warping is necessarily present and as such should be
taken into account in supernovae bounds and in searches for corrections to
Newtonian gravity.


title:
Single scalar top production with polarized beams in ep collisions at
  HERA

abstract:
  From the point of view of the R-parity breaking supersymmetric model, we
propose a scalar top (stop) search with longitudinally polarized electron (e-)
and positron(e+) beams which will soon be available at the upgraded HERA. Fully
polarized e- or e+ beams could produce the stop two times as much as
unpolarized beams, while they increase background events due to the process of
the standard model by about 30% in comparison with unpolarized ones. We show
that right-handed e+ beams at HERA is efficient to produce the stop in the
model. With 1 fb**(-1) of integrated luminosity we estimate reach in the
coupling constant lambda'(131) for masses of the stop in the range 160-400 GeV.
We can set a 95% confidence-level exclusion limit for lambda'(131) > 0.01-0.05
in the stop mass range of 240-280 GeV if no singal of the stop is observed. We
also point out that y(=Q**2/sx) distributions of e+ coming from the stop shows
the different behavior from those of the standard model.


title: New Scaling at High Energy DIS

abstract:
  We develop a new approach for solving the non-linear evolution equation in
the low $x_B$ region and show that the remarkable "geometric" scaling of its
solution holds not only in the saturation region, but in much wider kinematical
region. This is in a full agreement with experimental data (Golec-Biernat,
Kwiecinski and Stasto).


title: Violation of Equivalence Principle and Solar Neutrinos

abstract:
  We have updated the analysis for the solution to the solar neutrino problem
by the long-wavelength neutrino oscillations induced by a tiny breakdown of the
weak equivalence principle of general relativity, and obtained a very good fit
to all the solar neutrino data.


title: Supernova Neutrino Oscillations

abstract:
  We discuss some possible influence of neutrino oscillations on physics of
supernova mainly focusing on the observations of $\bar{\nu}_e$, and present
some analysis of SN1987A data in the light of three neutrino mixing scheme.


title: Meson-Baryon Couplings and the F/D ratio in Light Cone QCD

abstract:
  Using the general form of the baryon currents, we calculate the meson-baryon
coupling constants and the F/D ratio within the framework of light cone QCD sum
rules in the SU(3) flavor symmetry limit. The dependence of the results on the
Dirac structure and on the free parameter (b) appearing in the general baryon
current is considered. Comparison of our results on F/D ratio with the existing
results is presented.


title:
Hadronic collisions: physics, models and event generators used for
  simulating the cosmic ray cascade at the highest energies

abstract:
  Most hadronic event generators which can be used for simulating hadronic and
nuclear collisions up to the highest energies are quite similar in their
construction and in the underlying theoretical concepts. At energies, where
data from accelerator and collider experiments are available the models agree
rather well with each other and with the most important features of the data.
As soon as we compare the extrapolations of the models at higher energy we find
in spite of the similarities in the underlying theoretical concepts quite often
striking differences between the predictions of the models.


title: The quest for the Cabibbo Kobayashi Maskawa Matrix

abstract:
  A piece of the Standard Model presently undergoing intense experimental
scrutiny is the Cabibbo Kobayashi Maskawa matrix. Several different
measurements are planned to enrich the spectrum of experimental constraints and
thus provide one of the most stringent tests of Standard Model validity. The
success of this program is closely related to theoretical progress in
evaluating QCD matrix elements in a non-perturbative regime, as we need to
extract fundamental quark properties from observations on decays involving
hadrons. This interplay between experimental and theoretical progress will be
illustrated in the context of the present knowledge of the magnitudes of the
quark mixing parameters $| V_{cb}| $ and $| V_{ub}|$.


title: QCD Loop Corrections to Top Production and Decay

abstract:
  We discuss the computation of QCD virtual corrections to the top production
and decay process at linear colliders. The double pole approximation (DPA) is
used, and we comment on similarities and differences between our results and
results obtained in a similar framework for the QED corrections to the W pair
production process at LEPII.


title: The Non-commutative Brane World

abstract:
  We propose a new higher-dimensional mechanism to localize scalar fields as
well as fermionic and gauge fields. The underlying theory is a six-dimensional
non-commutative field theory where non-commutativity is allowed along two extra
infinite spatial dimensions and the four-dimensional brane is provided by a
scalar soliton living in the non-commutative space. Making use of the powerful
correspondence between non-commutative coordinates and operators on a single
particle Hilbert space, we show that the non-commutative brane world admits
localized chiral fermions and it ensures the localization of massless gauge
fields. It may also give rise to a variety of different low-energy spectra
since the localized zero mode may come along either with a discrete tower of
degenerate heavy states or with a tower of Kaluza-Klein heavy states, or it may
even be the only state in the low-energy spectrum.


title:
TESLA: Potentials of $\gamma\gamma$ and $e^+e^-$ Options in Stoponium
  Searches

abstract:
  In some supersymmetric extensions of the Standard Model fairly light
superpartner of t-quark is predicted, which may form bound states - stoponiums.
We estimate potentials of TESLA linear collider in search for stoponium,
considering the basic e+e- option and the gamma-gamma option (Photon Linear
Collider - PLC).
  It is found that PLC could be the best machine for discovery of these new
narrow strong resonances. It can produce thousands stoponiums per 100 fb$^-1$
integrated luminosity in the high energy peak. In the case of scenarios when
stoponium decays mainly into gluons the signal/background ratio is about 1/4.
The channel S->hh into two lightest Higgs bosons could be also seen with high
significance. Thus, several weeks run is sufficient for the stoponium
discovery, if its mass is approximately known (e.g. from observation of direct
stops production at LHC). Then, in MSSM scenarios with dominant S->hh decay PLC
shows excellent possibilities to discover bound state of stops, practically
immediately after beginning of operating.
  The e+e- option also has some prospects to observe stoponium but only in the
case of scenarios with dominant decay into two lightest Higgs bosons, with tens
of events per 100 $fb^{-1}$. Interesting possibility appears in the case when
the resonance is seated on 0.1% width luminosity peak - one could resolve the
stoponium exited states.


title: Higgs production in gluon fusion to order \alpha_s^4

abstract:
  The calculation of the NNLO QCD corrections to the partonic process gg -> H
is outlined. For the coupling of the Higgs boson to the gluons we use an
effective Lagrangian in the limit of a heavy top quark. The focus is on the
evaluation of the virtual two-loop corrections. It is shown that the leading
pole terms are in agreement with the general formula by Catani.


title: Gluon Radiation in Top Quark Production and Decay at $e^+e^-$ Colliders

abstract:
  We study gluon radiation in top quark production above threshold at high
energy $e^+e^-$ colliders. We allow for the top quarks to be off-shell,
considering radiation in both the top production and decay processes
simultaneously. Our calculation includes all top width effects, spin
correlations, and $b$ quark mass effects. We study the effects of gluon
radiation on top mass reconstuction and examine the interference between
production- and decay-stage radiation, which can be sensitive to the value of
the top quark decay width.


title: A supersymmetric 3-3-1 model

abstract:
  We build the complete supersymmetric version of a 3-3-1 gauge model using the
superfield formalism. We point out that a discrete symmetry, similar to the
R-symmetry in the minimal supersymmetric standard model, is possible to be
defined in this model. Hence we have both R-conserving and R-violating
possibilities. Analysis of the mass spectrum of the neutral real scalar fields
shown that in this model the lightest scalar Higgs has a mass upper limit, and
at the tree level it is 124.5 GeV for a given illustrative set of parameters.


title: Structure Functions for the Virtual and Real Photons

abstract:
  Development of concepts related to the photon and its high energy hadronic
interaction is briefly reviewed. A photon considered as an ideal probe of
hadron structure, paradoxically is also considered as an ideal target to test
the perturbative QCD. The present status of the theoretical and experimental
analysis of the structure functions for a virtual and real photon is presented.


title: Trilinear Neutral Gauge Boson Couplings in Effective Theories

abstract:
  We list all the lowest dimension effective operators inducing off-shell
trilinear neutral gauge boson couplings Z-Z-Photon, Z-Photon-Photon, and ZZZ
within the effective Lagrangian approach, both in the linear and nonlinear
realizations of the SU(2)_{L} X U(1)_Y gauge symmetry. In the linear scenario
we find that these couplings can be generated only by dimension eight operators
necessarily including the Higgs boson field, whereas in the nonlinear case they
are induced by dimension six operators. We consider the impact of these
couplings on some precision measurements such as the magnetic and electric
dipole moments of fermions, as well as the Z boson rare decay Z ->
neutrino+antineutrino+ photon. If the underlying new physics is of a decoupling
nature, it is not expected that trilinear neutral gauge boson couplings may
affect considerably any of these observables. On the contrary, it is just in
the nonlinear scenario where these couplings have the more promising prospects
of being perceptible through high precision experiments.


title: The role of supersymmetry phenomenology in particle physics

abstract:
  Supersymmetry phenomenology is an important component of particle physics
today. I provide a definition of supersymmetry phenomenology, outline the scope
of its activity, and argue its legitimacy. This essay derives from a
presentation given at the 2000 SLAC Summer Institute.


title: A Note on Gaugino Masses in Kaluza-Klein/Radion Mediated SUSY Breaking

abstract:
  We review the equivalence of two approaches to study theories with gauge
fields in extra spatial dimensions, namely the ``4D'' approach (with KK states)
and the ``5D'' approach (with matching to the 4D theory at the compactification
scale). In particular, we reiterate that there are two different power-law
scalings of ``effective'' gauge couplings. In a supersymmetric framework with
SUSY breaking in the radius modulus, i.e., the field which fixes the size of
the extra dimensions, these two approaches seem to give gaugino masses at
loop-level (with a possible enhancement due to large number of Kaluza-Klein
states) (hep-ph/0008069), and tree-level (hep-ph/0008103), respectively. We
show explicitly how this discrepancy can be resolved.


title:
Two-Loop Renormalization of Heavy--Light Currents at Order 1/m_Q in the
  Heavy-Quark Expansion

abstract:
  We present exact results, at next-to-leading order in renormalization-group
improved perturbation theory, for the Wilson coefficients appearing at order
1/m_Q in the heavy-quark expansion of heavy-light current operators. To this
end, we complete the calculation of the corresponding two-loop anomalous
dimension matrix. Our results are important for determinations of |V_{ub}|
using exclusive and inclusive semileptonic B decays. They are also relevant to
computations of the decay constant f_B based on a heavy-quark expansion.


title:
Direct probes of R-parity-violating supersymmetric couplings via
  single-top-squark production

abstract:
  We study the s-channel production of a single top squark in hadron collisions
through an R-parity-violating mechanism, examining in detail the case in which
the squark decays through an R-parity-conserving process into a bottom quark, a
lepton, and missing energy. We show that the top squark can be discovered if
its mass is less than 400 GeV, or that the current bound on the size of the
R-parity-violating couplings can be reduced by up to one order of magnitude
with existing data and by two orders of magnitude at the forthcoming run II of
the Fermilab Tevatron.


title: gamma-gamma Interactions from Real to Virtual Photons

abstract:
  A `complete' framework for gamma-gamma / gamma*-gamma / gamma*-gamma*
interactions is presented. The emphasis is on providing a model for gamma-gamma
physics at all photon virtualities, including the difficult transition region
around the rho meson mass.


title: Universal Torsion Induced Interaction from Large Extra Dimensions

abstract:
  We consider a model with extra compact dimensions in which only gravity
exists in the 4+n dimensional bulk. If the gravitational connection is not
assumed to be symmetric, that is, unless torsion is artificially set to zero,
then a universal contact interaction among the fermions on the 4-dimensional
wall is induced. Using a global fit to Z-pole observables, we find the 3 sigma
bound on the scale of quantum gravity to be M_S = 28 TeV for n=2. If Dirac or
light sterile neutrinos are present, the data from SN1987A increase the bound
to \sqrt{n} M_S >= 210 TeV.


title: QCD Radiation off Heavy Particles

abstract:
  An algorithm for an improved description of final-state QCD radiation is
introduced. It is matched to the first-order matrix elements for gluon emission
in a host of decays, for processes within the Standard Model and the Minimal
Supersymmetric extension thereof.


title: PYTHIA Status Report

abstract:
  Recent improvements in the PYTHIA event generator are summarized: new hard
subprocesses, gamma*-gamma* physics, QCD final-state showers, and more.


title: A Feynman Diagram Analyser DIANA - Graphic Facilities

abstract:
  New developments concerning the extension of the recently introduced Feynman
diagram analyser DIANA are presented.


title: Supergravity models of Quintessence and Supersymmetry breaking

abstract:
  The issue of Supersymmetry breaking in the context of Supergravity models of
Quintessence is discussed.


title: Beyond leading order effects in photon pair production at the Tevatron

abstract:
  We discuss effects induced by beyond leading order contributions to photon
pair production. We point out that next to leading order contributions to the
fragmentation component of the signal lead to a change in the shape of
distributions. This is already mildly visible in present Tevatron data though
stringent isolation criteria tend to suppress the fragmentation component
considerably. We expect the effect to be experimentally confirmed in future
data samples with higher statistics which would serve as a precision test for
QCD.


title: SUSY Long-Lived Massive Particles: Detection and Physics at the LHC

abstract:
  We draw a possible scenario for the observation of massive long-lived charged
particles at the LHC detector ATLAS. The required flexibility of the detector
triggers and of the identification and reconstruction systems are discussed. As
an example, we focus on the measurement of the mass and lifetime of long-lived
charged sleptons predicted in the framework of supersymmetric models with
gauge-mediated supersymmetry (SUSY) breaking. In this case, the
next-to-lightest SUSY particle can be the light scalar partner of the tau
lepton, possibly decaying slowly into a gravitino. A wide region of the SUSY
parameters space was explored. The accessible range and precision on the
measurement of the SUSY breaking scale parameter sqrt(F) achievable with a
counting method are assessed.


title: Comment on "Nucleon elastic form factors and local duality"

abstract:
  We comment on the papers "Nucleon elastic form factors and local duality"
[Phys. Rev. {\bf D62}, 073008 (2000)] and "Experimental verification of
quark-hadron duality" [Phys. Rev. Lett. {\bf 85}, 1186 (2000)]. Our main
comment is that the reconstruction of the proton magnetic form factor, claimed
to be obtained from the inelastic scaling curve thanks to parton-hadron local
duality, is affected by an artifact.


title:
On the chaoticity of active-sterile neutrino oscillations in the early
  universe

abstract:
  We have investigated the evolution of the neutrino asymmetry in
active-sterile neutrino oscillations in the early universe. We find that there
are large regions of parameter space where the asymmetry is extremely sensitive
to variations in the initial asymmetry as well as the external parameters (the
mass difference and the mixing angle). In these regions the system undergoes
chaotic transitions; however, the system is never truly chaotic in the sense
that all information about initial conditions is lost. In some cases though,
enough information is lost that the final sign of the neutrino asymmetry is
stochastic. We discuss the implications of our findings for Big Bang
nucleosynthesis (BBN) and the cosmic microwave background (CMB).


title: The Standard Model Higgs in $\gamma \gamma$ Collisions

abstract:
  For a Higgs boson below the $W^\pm$ threshold, the $\gamma \gamma$ collider
option of a future linear $e^+ e^-$ machine is compelling. In this case one can
measure the ``gold-plated'' loop induced $\Gamma (H \longrightarrow \gamma
\gamma)$ partial width to high precision, testing various extensions of the
Standard Model. With recent progress in the expected $\gamma \gamma$ luminosity
at TESLA, we find that for a Higgs of 115 GeV a statistical accuracy of the two
photon partial width of 1.4 % is possible. The total width depends thus solely
on the accuracy of $BR(H \longrightarrow \gamma \gamma)$ and is of ${\cal O}
(10 %)$.


title: Electroweak Sudakov corrections

abstract:
  At energies much larger than the mass of the weak gauge bosons, electroweak
radiative corrections can lead to significant corrections. At 1 TeV the one
loop corrections can be of ${\cal O} (20 %)$ due to large contributions of the
Sudakov type. We summarize recent progress in the evaluation and resummation of
the double and single logarithmic corrections to general scattering amplitudes
for fermions, transversely as well as longitudinally polarized external lines.


title: Tree-level FCNC in the B system: from CP asymmetries to rare decays

abstract:
  Tree-level Flavor-Changing Neutral Currents (FCNC) are characteristic of
models with extra vector-like quarks. These new couplings can strongly modify
the B^0 CP asymmetries without conflicting with low--energy constraints. In the
light of a low CP asymmetry in B --> J/\psi K_{S}, we discuss the implications
of these contributions. We find that even these low values can be easily
accommodated in these models. Furthermore, we show that the new data from B
factories tend to favor an O(20) enhancement of the b --> d l \bar{l}
transition over the SM expectation.


title: Recent Results on BFKL Physics

abstract:
  Virtual photon scattering in $e^+e^-$ collisions can result in events with
the electron-positron pair produced at large rapidity separation in association
with hadrons. The BFKL equation resums large logarithms that dominate the cross
section for this process. After a brief overview of analytic BFKL resummation
and its experimental status, we report on a Monte Carlo method for solving the
BFKL equation that allows kinematic constraints to be taken into account. We
discuss results for $e^+e^-$ collisions using both fixed-order QCD and the BFKL
approach. We conclude with some brief comments on the status of NLL
calculations.


title:
Do precision electroweak constraints guarantee $\epem$ collider
  discovery of at least one Higgs boson of a type-II two-Higgs-doublet model?

abstract:
  The manner in which the parameters of a two-Higgs-doublet model can be chosen
so that no Higgs boson is discovered at a $\sqrt{s}\leq 800\gev$ $\epem$
collider, while maintaining consistency with current precision electroweak
measurements, is described. The importance of a Giga-$Z$ factory and higher
collider energies for such a scenario is emphasized.


title: Top Production and Decay at Linear Colliders: QCD Corrections

abstract:
  We present the results of an exact calculation of gluon radiation in top
production and decay at high energy electron-positron colliders. We include all
spin correlations and interferences, the bottom quark mass, and finite top
width effects in the matrix element calculation. We study properties of the
radiated gluons and implications for top mass measurement. We also discuss
virtual corrections to the process.


title: BFKL Physics in Jet Production at e+e- colliders

abstract:
  Virtual photon scattering in $e^+e^-$ collisions can result in events with
the electron-positron pair at large rapidity separation with hadronic activity
in between. The BFKL equation resums large logarithms that dominate the cross
section for this process. We report here on a Monte Carlo method for solving
the BFKL equation that allows kinematic constraints to be taken into account
and show results for $e^+e^-$ collisions.


title: Can we distinguish an MSSM Higgs from a SM Higgs at a Linear Collider?

abstract:
  We study the prospects for distinguishing the CP-even Higgs boson of the
minimal supersymmetric extension of the Standard Model (MSSM) from the Standard
Model (SM) Higgs boson by measuring its branching ratios at an e+e- linear
collider. The regions of the M_A - tan beta plane in which an MSSM Higgs boson
can be distinguished from the SM Higgs boson depend strongly upon the
supersymmetric parameters that enter the radiative corrections to the Higgs
mass matrix and the Higgs couplings to fermions. In some regions of parameter
space it is possible to extract the supersymmetric correction to the relation
between the b quark mass and its Yukawa coupling from Higgs branching ratio
measurements.


title:
Neutrino mass and oscillation as probes of physics beyond the Standard
  Model

abstract:
  We present a review of the present status of the problem of neutrino masses
and mixing including a survey of theoretical motivations and models,
experimental searches and implications of recently appeared solar and
atmospheric neutrino data, which strongly indicate nonzero neutrino masses and
mixing angles.


title: Lectures on the Theory of Non-leptonic B Decays

abstract:
  These notes provide a pedagogical introduction to the theory of non-leptonic
heavy-meson decays recently proposed by Beneke, Buchalla, Sachrajda and myself.
We provide a rigorous basis for factorization for a large class of non-leptonic
two-body B-meson decays in the heavy-quark limit. The resulting factorization
formula incorporates elements of the naive factorization approach and the
hard-scattering approach, and allows us to compute systematically radiative
(``non-factorizable'') corrections to naive factorization for decays such as
B->D+pi and B->pi+pi.


title: Probing Slepton Mass Non-Universality at e^+e^- Linear Colliders

abstract:
  There are many models with non-universal soft SUSY breaking sfermion mass
parameters at the grand unification scale. Even in the mSUGRA model scalar mass
unification might occur at a scale closer to M_Planck, and renormalization
effects would cause a mass splitting at M_GUT. We identify an experimentally
measurable quantity Delta that correlates strongly with delta m^2 =
m^2_{selectron_R}(M_GUT) - m^2_{selectron_L}(M_GUT), and which can be measured
at electron-positron colliders provided both selectrons and the chargino are
kinematically accessible. We show that if these sparticle masses can be
measured with a precision of 1% at a 500 GeV linear collider, the resulting
precision in the determination of Delta may allow experiments to distinguish
between scalar mass unification at the GUT scale from the corresponding
unification at Q ~ M_Planck. Experimental determination of Delta would also
provide a distinction between the mSUGRA model and the recently proposed
gaugino-mediation model. Moreover, a measurement of Delta (or a related
quantity Delta') would allow for a direct determination of delta m^2.


title: On Supersymmetric Dark Matter

abstract:
  The extra particles provided by Supersymmetry (SUSY) appear as natural
candidates for exotica such as the missing Dark Matter of the Universe. The
particle candidates for Dark Matter, and the basic elements of the minimal
supersymmetric extension of the Standard Model are reviewed. The needed
elements to compute the neutralino counting rate are given, considering new
Yukawa loop corrections to the neutralino-neutralino-Higgs boson couplings when
the neutralino is a Bino-like state. Including the new loop corrections in the
Bino limit, the counting rate is improved for several values of the soft
breaking supersymmetric parameters.


title: Resonance Propagation and Threshold Singularities

abstract:
  We consider the problem of propagation of an unstable particle in the
framework of Quantum Field Theory. Using unitarity, we show that a real
renormalization constant free of threshold singularities naturally arises.


title:
Revisiting Charmless Two-Body B Decays involving $\eta^{\prime}$ and
  $\eta$

abstract:
  We have studied charmless two-body B decays involving $\eta$ and $\eta'$ in
the framework of QCD improved factorization appraoch. The spectator hard
scattering mechanism for $\eta'$ production have been re-examined and extended,
which contributions are incorporated consistently into the factorizable leading
contributions. It is found that the conventional mechanism would give $Br(B\to
\eta' K)\sim 30\times 10^{-6}$ which agrees with predictions based on naive
factorization approaches. With the incorporation of spectator hard scattering
mechanism contributions, theoretical predictions are improved much and the bulk
of $Br(B\to \eta' K)$ are accommodated in the reasonable parameter space. We
have also presented calculations of $g^{\ast}g^{\ast}-\eta^{(\prime)}$
transition form factors within the standard hard scattering approach. It is
shown that the new contributions in the modes such as $B\to \eta' +vector$ and
$B\to \eta+ \pi, \rho, K^{(\ast)}$ are small. Direct CP-violation in those
decay modes are predicted. It is shown that the prospects for measuring direct
CP-violation effects in $B^{\pm} \to$ $\eta' K^{\pm}$, $\eta' \pi^{\pm}$, $\eta
\pi^{\pm}$, and $\eta K^{\pm}$ are promising at B factories in the near future.


title: New algebraic-numeric methods for loop integrals. Some 1-loop experience

abstract:
  We report our experiences with the generalized integration-by-parts algorithm
[hep-ph/9609429] in the context of calculations of a realistic one-loop subset
of diagrams.


title: Jet algorithms. Wrapping up the subject

abstract:
  This postscriptum to the theory of jet definition [hep-ph/9901444] summarizes
the points which did not find their way into the main text.


title: Probing the QCD vacuum

abstract:
  Heavy quark bound states are used as significative probes of the QCD vacuum
and the mechanism of confinement.


title:
The $\eta^\prime g^* g^*$ vertex with arbitrary gluon virtualities in
  the perturbative QCD hard scattering approach

abstract:
  We study the $\eta^\prime g^* g^*$ vertex for arbitrary gluon virtualities in
the time-like and space-like regions, using the perturbative QCD hard
scattering approach and an input wave-function of the $\eta^\prime$-meson
consistent with the measured $\eta^\prime \gamma^* \gamma$ transition form
factor. The contribution of the gluonic content of the $\eta^\prime$-meson is
taken into account, enhancing the form factor over the entire virtuality
considered. However, data on the electromagnetic transition form factor of the
$\eta^\prime$-meson is not sufficient to quantify the gluonic enhancement. We
also study the effect of the transverse momenta of the partons in the
$\eta^\prime$-meson on the $\eta^\prime g^* g^*$ vertex, using the modified
hard scattering approach based on Sudakov formalism. Analytic expressions for
the $\eta^\prime g^* g^*$ vertex are presented in limiting kinematic regions
and parametrizations are given satisfying the QCD anomaly, for real gluons, and
perturbative QCD behavior for large gluon virtualities, in both the time-like
and space-like regions. Our results have implications for the inclusive decay
$B \to \eta^\prime X$ and exclusive decays, such as $B \to \eta^\prime
(K,K^*)$, and in hadronic production processes $N + N (\bar N) \to \eta^\prime
X$.


title: (De)Stabilization of an extra dimension due to a Casimir force

abstract:
  We study the stabilization of one spatial dimension in (p+1+1)-dimensional
spacetime in the presence of $p$-dimensional brane(s), a bulk cosmological
constant and the Casimir force generated by a conformally coupled scalar field.
We find general static solutions to the metric which require the fine-tuning of
the inter-brane distance and the bulk cosmological constant (leaving the two
brane tensions as free parameters) corresponding to a vanishing effective
cosmological constant and a constant radion field. Taking these solutions as a
background configuration, we perform a dimensional reduction and study the
effective theory in the case of one- and two-brane configurations. We show that
the radion field can have a positive mass squared, which corresponds to a
stabilization of the extra dimension, only for a repulsive nature of the
Casimir force. This type of solution requires the presence of a negative
tension brane. The solutions with one or two positive tension branes arising in
this theory turn out to have negative radion mass squared, and therefore are
not stable.


title: Cosmology and particle physics

abstract:
  The state of our understanding of cosmology is reviewed from an astrophysical
cosmologist point of view with a particular emphasis given to recent
observations and their impact. Discussion is then presented on the implications
for particle physics.


title: Determination of Unitarity Triangle parameters: where do we stand ?

abstract:
  In this note I review the current determination of the unitarity triangle
parameters by using the theoretical and experimental information available in
summer 2000.


title: Beyond the standard model with B physics

abstract:
  Extensions of the Standard Model may have significant effects on B physics
observables. Two examples of methods that may find such effects are reviewed:
Resolving discrete ambiguities in CP asymmetries and detecting right handed
currents in radiative B decays.


title:
Rare decays $B\to X_s\tau^+\tau^-$ and $B_s\to \tau^+\tau^-\gamma$ in
  technicolor with scalars

abstract:
  We examine the rare decays $B\to X_s\tau^+\tau^-$ and $B_s\to\tau^+\tau^-
\gamma$ in the framework of technicolor with scalars. The contributions from
both the neutral and charged scalars predicted in this model are evaluated. We
find that the branching ratios could be enhanced over the standard model
predictions by a couple of orders of magnitude in some part of parameter space.
The forward-backward asymmetry and the distributions of differential branching
ratios are also found to differ significantly from the standard model results.
Such large new physics effects might be observable in the new generation of B
experiments.


title: b Quark Physics with 2 .10^9 Z Bosons

abstract:
  It has been suggested to realize a factory for 10^9 Z^0 through a linear
e^+e^- collider with polarized beams. Very likely the relevant CP studies for B
mesons will already have been performed at the B factories by that time, hence
GIGA-Z will be a third generation b physics experiment. Yet such a facility
would provide us with unique opportunities in the domain of beauty physics that
would be of essential significance even in 2010: (1) Production and decay of
polarized beauty baryons; (2) searching for and probing transitions driven by b
--> q \nu \bar{\nu}; (3) detailed and comprehensive studies of inclusive
semileptonic B_s decays.


title: In Pursuit of New Physics with B_s Decays

abstract:
  The presence of a sizeable CP-violating phase in B_s^0-B_s^0-bar mixing would
be an unambiguous signal of physics beyond the Standard Model. We analyse
various possibilities to detect such a new phase considering both tagged and
untagged decays. The effects of a sizeable width difference Delta Gamma between
the B_s mass eigenstates, on which the untagged analyses rely, are included in
all formulae. A novel method to find this phase from simple measurements of
lifetimes and branching ratios in untagged decays is proposed. This method does
not involve two-exponential fits, which require much larger statistics. For the
tagged decays, an outstanding role is played by the observables of the
time-dependent angular distribution of the B_s -> J/psi [-> l^+ l^-] \phi [->
K^+K^-] decay products. We list the formulae needed for the angular analysis in
the presence of both a new CP-violating phase and a sizeable Delta Gamma, and
propose methods to remove a remaining discrete ambiguity in the new phase. This
phase can therefore be determined in an unambiguous way.


title: Hard Exclusive Production of Tensor Mesons

abstract:
  We point out that hard exclusive production of tensor mesons $f_2(1270)$ with
helicity $\lambda=\pm 2$ is dominated by the gluon component in the meson wave
function and can be used to determine gluon admixture in tensor mesons in a
theoretically clean manner.
  We present a detailed analysis of the tensor meson distribution amplitudes
and calculate the transition form factor $\gamma+\gamma^*\to f_2(1270)$ for one
real and one virtual photon.


title:
Zweig rule violation in the scalar sector and values of low-energy
  constants

abstract:
  We discuss the role of the Zweig rule violation in the scalar channel for the
determination of low-energy constants and condensates arising in the effective
chiral Lagrangian of QCD. The analysis of the Goldstone boson masses and decay
constants shows that the three-flavor condensate and some low-energy constants
are very sensitive to the value of the Zweig Rule violating constant L_6. A
similar study is performed in the case of the decay constants. A chiral sum
rule based on experimental data in the scalar channel is used to constrain L_6,
indicating a significant decrease between the two- and the three-flavor
condensates. The analysis of the scalar form factors of the pion at zero
momentum suggests that the pseudoscalar decay constant could also be suppressed
from N_f=2 to 3.


title: Lifetime difference of $B_s$ mesons - Theory status

abstract:
  We give an update on the lifetime difference of $B_s$ mesons which accounts
for recent lattice bag parameter results, and obtain
$(\Delta\Gamma/\Gamma)_{B_s}=(9.3^{+3.4}_{-4.6})%$. We then review the current
theoretical uncertainties and conclude with a pessimistic perspective on
further improvements.


title: Cosmological Phase Transitions in a Brane World

abstract:
  In brane world scenarios the Friedmann equation is modified, resulting in an
increased expansion at early times. This has important effects on cosmological
phase transitions which we investigate, elucidating significant differences to
the standard case. First order phase transitions require a higher nucleation
rate to complete; baryogenesis and particle abundances could be suppressed.
Topological defect evolution is also affected, though the current defect
densities are largely unchanged. In particular, the increased expansion does
not solve the usual monopole and domain wall problems.


title: Investigation of meson loop effects in the Nambu-Jona-Lasinio model

abstract:
  The influence of mesonic fluctuations on quantities in the Nambu-Jona-Lasinio
model is examined in different approximation schemes: an expansion in powers of
1/N_c and an expansion up to one-meson loop in the effective action formalism.
It is explicitely proved that the Goldstone theorem as well as the
Gell-Mann-Oakes-Renner relation hold within those schemes. The influence of
meson-loop effects on the quark condensate, the pion mass, the pion decay
constant and properties of rho- and sigma-meson are investigated. First we
focus on the determination of a consistent set of parameters. In the 1/N_c
expansion scheme it is possible to find a set of parameters which allows to
simultaneously describe the quantities in the pion sector and those related to
the rho-meson, whereas this turns out to be not possible within the expansion
of the effective action. Besides, the relation of our model to hadronic models
is discussed. In the last part of this thesis the behavior of the quark
condensate at nonzero temperature is studied. In the low-temperature region
agreement with the model independent chiral perturbation theory result in
lowest order can be obtained. The perturbative 1/N_c expansion scheme does not
allow for an examination of the chiral phase transition at higher temperatures,
whereas this is possible within the meson-loop approximation scheme. A first
order phase transition is found.


title:
Polarization in Hadronic \Lambda Hyperon Production and Chiral-Odd
  Twist-3 Distribution

abstract:
  Polarization of the \Lambda hyperon produced with a large transverse momentum
in the unpolarized nucleon-nucleon collision is analyzed in the framework of
QCD factorization. We focus on the mechanism in which the soft-gluon component
of the chiral-odd spin-independent twist-3 quark distribution E_F(x,x) becomes
a source of the polarized quark fragmenting into the polarized \Lambda. Our
simple model estimate for this contribution indicates that it gives rise to a
significant \Lambda polarization at large x_F. This is in parallel with the
observation that the soft gluon pole mechanism gives rise to a large single
transverse spin asymmetry in the pion production at x_F\to 1.


title: On the anomalous dimension for the transversity distribution

abstract:
  We show that a standard calculation of the splitting function for the
nonsinglet structure function h_1 does not lead to the expected result. The
calculation is compared to the corresponding derivation of the splitting
function for the nonsinglet polarized structure function g_1. We analyze
possible explanations for the unexpected result and discuss its implications.
PACS: 11.10.Hi; 11.40.-q; 11.55.Ds; 13.88.+e


title:
Gravitational Interaction of Neutrinos in Models with Large Extra
  Dimensions

abstract:
  Whenever fields are allowed to propagate in different portions of space-time,
the four dimensional theory exhibits an effective violation of the principle of
equivalence. We discuss the conditions under which such an effect is relevant
for neutrino physics. In the simplest case of compactification on a flat
manifold, the effect of gravity is many orders of magnitude too weak and plays
no role for solar neutrino oscillation. Instead, it could be important in the
study of ultra high-energy neutrinos in cosmic rays. Gravity could also be
relevant for lower energy neutrino processes involving bulk sterile states, if
the mechanism of compactification is more subtle than that on torii.