title: Final state interaction and a light mass "exotic" resonance

abstract:
  We investigate the possibility that the light-mass exotic mesons with
J^PC=1^-+ observed at BNL and CERN may be resonances in the eta-pi and eta'-pi
systems associated with the anomalous glue which generates the eta' mass in
QCD.


title: Non-factorizable corrections and effective field theories

abstract:
  We analyze the structure of higher-order radiative corrections for processes
with unstable particles. By subsequently integrating out the various scales
that are induced by the presence of unstable particles we obtain a hierarchy of
effective field theories. In the effective field theory framework the
separation of physically different effects is achieved naturally. In
particular, we automatically obtain a separation of factorizable and
non-factorizable corrections to all orders in perturbation theory. At one loop
this treatment is equivalent to the double-pole approximation (DPA) but
generalizes to higher orders and, at least in principle, to beyond the DPA. It
is known that one-loop non-factorizable corrections to invariant mass
distributions are suppressed at high energy. We study the mechanism of this
suppression and obtain estimates of higher-order non-factorizable corrections
at high energy.


title: Bayesian View Of Solar Neutrino Oscillations

abstract:
  We present the results of a Bayesian analysis of solar neutrino data in terms
of nu_e->nu_{mu,tau} and nu_e->nu_s oscillations, where nu_s is a sterile
neutrino. We perform a Rates Analysis of the rates of solar neutrino
experiments, including the first SNO CC result, and spectral data of the CHOOZ
experiment, and a Global Analysis that takes into account also the
Super-Kamiokande day and night electron energy spectra. We show that the
Bayesian analysis does not suffer any problem from the inclusion of the
numerous bins of the CHOOZ and Super-Kamiokande energy spectra and allows to
reach the same conclusions on the favored type of neutrino transitions and on
the determination of the most favored values of the oscillation parameters in
both the Rates and Global Analysis. Our Bayesian analysis shows that nu_e->nu_s
transitions are strongly disfavored with respect to nu_e->nu_{mu,tau}
transitions. In the case of nu_e->nu_{mu,tau} oscillations, the LMA region is
favored by the data (86% probability), the LOW region has some small chance
(13% probability), the VO region is almost excluded (1% probability) and the
SMA region is practically excluded (0.01% probability). We calculate also the
marginal posterior probability distributions for tan^2 theta and Delta m^2 and
we show that the data imply large mixing almost with certainty and large values
of Delta m^2 are favored. We present also the results of a standard
least-squares analysis and we show that the standard goodness of fit test is
not able to rejects pure nu_e->nu_s transitions. The likelihood ratio test
allows to reject pure nu_e->nu_s transitions in favor of nu_e->nu_{mu,tau}
transitions only in the Global Analysis.


title: The Standard Model Prediction for Muon g-2

abstract:
  The present Standard Model prediction for muon g-2 is reviewed. Emphasis is
put in discussing the main hadronic uncertainties at present.


title:
Non-Standard Interactions: Atmospheric versus Neutrino Factory
  Experiments

abstract:
  We consider the potential of a generic neutrino factory (NUFACT) in probing
non-standard neutrino-matter interactions (NSI). We find that the sensitivity
to flavour-changing (FC) NSI can be substantially improved with respect to
present atmospheric neutrino data, especially at energies higher than
approximately 50 GeV, where the effect of the tau mass is small. For example, a
100 GeV NUFACT can probe FC neutrino interactions at the level of few
$|\epsilon| < {few} \times 10^{-4}$ at 99 % C.L.


title: Emitter size as a function of mass and transverse mass

abstract:
  Bose-Einstein and Fermi-Dirac correlations show that the emitter dimension r
decreases as the hadron mass increases. Same behaviour is seen for the
longitudinal dimension r_z dependence on the transverse mass m_T. In both cases
the Heisenberg uncertainty relations yield the same expression for r(m) and
r_z(m_T). This r behaviour also describes the interatomic separation of Bose
condensates. If r represents the emitter radius then its energy density reaches
for baryon masses the high value of ~100GeV/fm^3.


title: The Standard Model in 2001

abstract:
  The Standard Model of electroweak and strong interactions is reviewed in a
pedagogical set of lectures. After an introduction to the quarks, leptons, and
gauge bosons, an elementary discussion of gauge theories is given, with
application to quantum chromodynamics. The physics of $W$ bosons, electroweak
unification, and $Z$ bosons is then described, ending with a discussion of
precision electroweak experiments and the light they can shed on the Higgs
boson and other physics.


title:
Flat directions, doublet-triplet splitting, the monopole problem, and
  all that

abstract:
  We discuss a supersymmetric SU(6) grand unified theory with the GUT flat
direction being lifted by soft supersymmetry breaking, and the doublet-triplet
splitting being achieved with Higgs as a pseudo-Goldstone boson. The theory
offers a simple solution to the false vacuum and monopole problems.


title:
The Cross Section of e^+ e^- Annihilation into Hadrons of Order
  alpha_s^4 n_f^2 in Perturbative QCD

abstract:
  We present the first genuine QCD five-loop calculation of the vacuum
polarization functions: analytical terms of order alpha_s^4 n_f^2 to the
absorptive parts of vector and scalar correlators. These corrections form an
important gauge-invariant subset of the full O(alpha_s^4) correction to $e^+
e^- annihilation into hadrons and the Higgs decay rate into hadrons
respectively. They discriminate between different widely used estimates of the
full result.


title: Neutrino Oscillations in Extra Dimensions

abstract:
  The characteristics and phenomenology of neutrino oscillation in extra
dimensions are briefly reviewed


title: Neutrinos as the messengers of CPT violation

abstract:
  CPT violation has the potential to explain all three existing neutrino
anomalies without enlarging the neutrino sector. CPT violation in the Dirac
mass terms of the three neutrino flavors preserves Lorentz invariance, but
generates independent masses for neutrinos and antineutrinos. This specific
signature is strongly motivated by braneworld scenarios with extra dimensions,
where neutrinos are the natural messengers for Standard Model physics of CPT
violation in the bulk. A simple model of maximal CPT violation is sufficient to
explain the exisiting neutrino data quite neatly, while making dramatic
predictions for the upcoming KamLAND and MiniBooNE experiments. Furthermore we
obtain a promising new mechanism for baryogenesis.


title: Electric charge quantization and the muon anomalous magnetic moment

abstract:
  We investigate some proposals to solve the electric charge quantization
puzzle, which simultaneously explain the recent measured deviation on the muon
anomalous magnetic moment. For this we assess extensions of the Electro-Weak
Standard Model spanning modifications on the scalar sector only. It is
interesting to verify that one can have modest extensions which easily account
for the solution for both problems.


title: B Production Asymmetries in Perturbative QCD

abstract:
  This paper explores a new mechanism for B production in which a b quark
combines with a light parton from the hard-scattering process before
hadronizing into the B hadron. This recombination mechanism can be calculated
within perturbative QCD up to a few nonperturbative constants. Though
suppressed at large transverse momentum by a factor Lambda_QCD m_b/p_t^2
relative to b quark fragmentation production, it can be important at large
rapidities. A signature for this heavy-quark recombination mechanism in
proton-antiproton colliders is the presence of rapidity asymmetries in B cross
sections. Given reasonable assumptions about the size of nonperturbative
parameters entering the calculation, we find that the asymmetries are only
significant for rapidities larger than those currently probed by collider
experiments.


title:
How Far Can the SO(10) Two Higgs Model Describe the Observed Neutrino
  Masses and Mixings ?

abstract:
  Can the SO(10) model with one {\bf 10} and one {\bf 126} Higgs scalars give
the observed masses and mixings of quarks and leptons without any other
additional Higgs scalars? Recently, at least, for quarks and charged leptons,
it has been demonstrated that it is possible. However, for the neutrinos, it is
usually said that parameters which are determined from the quark and charged
lepton masses cannot give the observed large neutrino mixings. This problem is
systematically investigated, and it is concluded that the present data cannot
exclude SO(10) model with two Higgs scalars although it cannot give the best
fit values of the data.


title:
Chiral Pertuabtion in the Hidden Local Symmetry and Fate of Vector
  Dominance

abstract:
  In this talk I summarize our recent work on the vector dominance in QCD by
using the the hidden local symmetry as an effective field theory of QCD.


title:
Implications of $\bar{\nu}_{e}e^{-}\to W^{-}\gamma$ for high-energy
  $\bar{\nu}_e$ observation

abstract:
  Absorption of high-energy $\bar{\nu}_e$ over electrons above the W boson
production threshold is reexamined. It is pointed out that, in the case of
photon emissions along the direction of incident high-energy $\bar{\nu}_e$, the
kinematically allowed average energy carried by the final state hard photon can
be $\leq 1%$ of the incident $\bar{\nu}_e$ energy above the W boson production
threshold. The differential energy spectrum for the final state hard photon is
calculated. We also discuss implications of our results for the prospective
search of high-energy $\bar{\nu}_e$ through this final state hard photon.


title: QCD Sum Rules for Heavy Flavour Physics

abstract:
  Uses of QCD sum rules for heavy flavoured hadrons are discussed. "Standard"
applications such as the determination of the $b$, $c$ quark masses, the
calculation of $f_B$, $f_D$ and of the heavy-to-light form factors are
overviewed. Furthermore, a new approach to calculate the $B\to \pi\pi$ hadronic
matrix elements from QCD light-cone sum rules is described.


title: The Spectrum of the MSSM with Non-Standard Supersymmetry Breaking

abstract:
  The Minimal Supersymmetric Standard Model (MSSM) can include two soft
breaking terms which are often neglected: a non-analytic scalar trilinear
coupling and a Higgsino bilinear term. A set of high-scale boundary conditions
consistent with the reparameterisation invariance which the model possesses is
obtained. The three-family renormalisation group equations for the MSSM with
these terms are presented. The ranges of the universal high-scale values of
these couplings which lead to an acceptable TeV-scale theory are obtained, as
is the supersymmetric particle spectrum at this scale. The effect of the new
terms on fine-tuning is presented. SOFTSUSY, an existing program for
calculating SUSY particle spectra, has been used, with as few modifications as
possible.


title:
L-Violating Supersymmetry - Implementation in PYTHIA and study of LHC
  discovery potential

abstract:
  In the Minimal Supersymmetric Standard Model (MSSM), the simultaneous
appearance of lepton and baryon number violation causes the proton to decay
much faster than the experimental bound allows. Customarily, a discrete
symmetry known as R-parity is imposed to forbid these dangerous interactions.
This work begins by arguing that there is no deep theoretical motivation for
preferring R-parity over other discrete symmetries and continues by adopting
the MSSM with baryon number conservation replacing R-parity conservation. For
the purpose of studying the influence of the consequent lepton number violating
interactions, 1278 new decay channels of supersymmetric particles into Standard
Model particles have been included in the PYTHIA event generator. The augmented
event generator is then used in combination with the atlfast detector
simulation to study the impact of lepton number violation on event topologies
in the ATLAS detector, and trigger menus designed for LV-SUSY are proposed
based on very general conclusions. The subsequent analysis uses a combination
of primitive cuts and neural networks to optimize the discriminating power
between signal and background events. In all scenarios studied, it is found
that a $5\sigma$ discovery is possible for cross sections down to $10^{-10}$ mb
with an integrated luminosity of 30 fb$^{-1}$.


title: Special Classes of Solutions for Linear String Baryon Configuration

abstract:
  For the linear string baryon model with three material points (three quarks)
joined sequentially by the relativistic strings, the class of motions admitting
linearizable boundary conditions is investigated. These motions may be
represented as the Fourier series with eigenfunctions of some boundary-value
problem. The two types of rotational motions are found among the mentioned
class of solutions.


title:
Unified Supersymmetric Model of Naturally Small Dirac Neutrino Masses
  and the Axionic Solution of the Strong CP Problem

abstract:
  Using the particle content of the fundamental {27} supermultiplet of E_6,
naturally small Dirac neutrino masses are obtained in the context of SU(3)_C
times SU(2)_L times U(1)_Y times U(1)_{chi}, where U(1)_{chi} comes from the
decomposition E_6 to SO(10) times U(1)_{psi}, then SO(10) to SU(5) times
U(1)_{chi}. New observable consequences are predicted at the TeV scale. An
axionic solution of the strong CP problem may be included at no extra cost.


title: Kaon Condensation and Goldstone's Theorem

abstract:
  We consider QCD at a nonzero chemical potential for strangeness. At a
critical value of the chemical potential equal to the kaon mass, kaon
condensation occurs through a continuous phase transition. We show that, when
the isospin symmetry is exact in the Lagrangian, a Goldstone boson with a
dispersion relation $E \sim p^2$ appears in the kaon condensed phase. At the
same time, the number of the Goldstone bosons is less than the number of broken
generators. Both phenomena are familiar in non-relativistic systems. We
interpret our results in terms of a Goldstone boson counting rule found
previously by Nielsen and Chadha. We also formulate a criterion sufficient for
the equality between the number of Goldstone bosons and the number of broken
generators.


title: Flat Vacuum Branes Without Fine Tuning

abstract:
  We construct solutions in purely gravitational bulk with flat vacuum branes
without fine tuning the constants of the theory. Our solutions incorporate one
or two branes and have topology S^1 x R^4 without Z_2 symmetry. They are not
invariant under the four-dimensional Lorentz group effectively acting on the
brane, but the significance of this fact will become clear only after the study
of their perturbations.


title: Strangeness production in a statistical effective model of hadronisation

abstract:
  We suppose that overall strangeness production in both high energy elementary
and heavy ion collisions can be described within the framework of an
equilibrium statistical model in which the effective degrees of freedom are
constituent quarks as used in effective lagrangian models. In this picture, the
excess of relative strangeness production in heavy ion collisions with respect
to elementary particle collisions arises from the unbalance between initial
non-strange matter and antimatter and from the exact colour and flavour quantum
number conservation over different finite volumes. The comparison with the data
and the possible sources of model dependence are discussed.


title: Azimuthal asymmetry in electro-production of neutral pions in SIDIS

abstract:
  Recently HERMES has observed an azimuthal asymmetry in electro-production of
neutral pions in semi-inclusive deep-inelastic scattering of unpolarized
positrons off longitudinally polarized protons. This asymmetry (like those
observed in the production of charged pions) is well reproduced theoretically
by using the non-perturbative calculation of the proton transversity
distribution in the effective chiral quark-soliton model combined with
experimental DELPHI-data on the new T-odd Collins fragmentation function. There
are no free, adjustable parameters in the analysis. Using the $z$-dependence of
the HERMES azimuthal asymmetry and the calculated transversity distributions
the z-dependence of the Collins fragmentation function is obtained. The value
obtained from HERMES data is consistent with the DELPHI result, even though
these results refer to different scales.


title:
Explicit Proof that Electroproduction of Transversely Polarized Vector
  Mesons Vanishes in Perturbative QCD

abstract:
  By means of an explicit one-loop calculation, it is shown that the leading
twist contribution to the exclusive electroproduction of transversely polarized
vector mesons from the nucleon vanishes. This confirms the all-orders proof by
Collins and Diehl.


title: Application of nonextensive statistics to particle and nuclear physics

abstract:
  We present an overview of possible imprints of non-extensitivity in particle
and nucler physics. Special emphasis is put on the intrinsic fluctuations
present in the system under consideration as the possible source of
nonextensivity. The possible connection of nonextensivity and the self
organized criticality apparently being observed in some cosmic rays and
hadronic experiments will also be discussed.


title: CP Violation, Neutrino Mixing and the Baryon Asymmetry

abstract:
  We study neutrino masses and mixings based on the simplest SO(10) mass
relations and the seesaw mechanism. We find that the requirement of large
neutrino mixings determines the relative magnitude of the heavy Majorana
neutrino masses in terms of the known quark mass hierarchy. This leads to
specific predictions for the structure of the neutrino mixing matrix, the light
neutrino masses, CP violation in neutrino oscillations, neutrinoless double
b-decay and the baryon asymmetry.


title:
Changing alpha With Time: Implications For Fifth-Force-Type Experiments
  And Quintessence

abstract:
  If the recent observations suggesting a time variation of the fine structure
constant are correct, they imply the existence of an ultra light scalar
particle. This particle inevitably couples to nucleons through the
\alpha-dependence of their masses and thus mediates an isotope-dependent
long-range force. The strength of the coupling is within a couple of orders of
magnitude from the existing experimental bounds for such forces. The new force
can be potentially measured in the precision experimental tests of the
equivalence principle. Due to an interesting coincidence of the required
time-scales, the scalar filed in question can at the same time play the role of
a quintessence field.


title: Baryons in O(4) and Vibron Model

abstract:
  The structure of the reported excitation spectra of the light unflavored
baryons is described in terms of multi-spin valued Lorentz group
representations of the so called Rarita-Schwinger (RS) type (K/2, K/2)* [(1/
2,0)+ (0,1/2)] with K=1,3, and 5. We first motivate legitimacy of such pattern
as fundamental fields as they emerge in the decomposition of triple fermion
constructs into Lorentz representations. We then study the baryon realization
of RS fields as composite systems by means of the quark version of the U(4)
symmetric diatomic rovibron model. In using the U(4)/ O(4)/ O(3)/ O(2)
reduction chain, we are able to reproduce quantum numbers and mass splittings
of the above resonance assemblies. We present the essentials of the four
dimensional angular momentum algebra and construct electromagnetic tensor
operators. The predictive power of the model is illustrated by ratios of
reduced probabilities concerning electric de-excitations of various resonances
to the nucleon.


title:
Geometry of Coherent States : Some Examples of Calculations of
  Chern-Characters

abstract:
  First we make a brief review of coherent states and prove that the resolution
of unity can be obtained by the 1-st Chern character of some bundle. Next we
define a Grassmann manifold for a set of coherent states and construct the
pull-back bundle making use of a projector from the parameter space to this
Grassmann manifold. We study some geometric properties (Chern-characters
mainly) of these bundles. Although the calculations of Chern-characters are in
general not easy, we can perform them for the special cases. In this paper we
report our calculations and propose some interesting problems to be solved in
the near future.


title: The annihilation of virtual photons into pseudoscalar mesons

abstract:
  We investigate the possibility to constrain the pion distribution amplitude
from the gamma* gamma* -> pi transition. For a surprisingly large range in the
two photon virtualities we find that the transition form factor is essentially
independent of the distribution amplitude. This in turn entails a
parameter-free prediction of QCD. The gamma* gamma* -> eta, eta' form factors
are also briefly discussed. We estimate that experimental studies might be
feasible at the existing e+ e- experiments BaBar, Belle, and CLEO.


title:
Resummation of angular dependent corrections in spontaneously broken
  gauge theories

abstract:
  Recent investigations of electroweak radiative corrections have revealed the
importance of higher order contributions in high energy processes, where the
size of typical corrections can exceed those associated with QCD considerably.
Beyond one loop, only universal (angular independent) corrections are known to
all orders except for massless $e^+ e^- \longrightarrow f {\overline f}$
processes where also angular dependent corrections exist in the literature. In
this paper we present general arguments for the consistent resummation of
angular dependent subleading (SL) logarithmic corrections to all orders in the
regime where all invariants are still large compared to the gauge boson masses.
We discuss soft isospin correlations, fermion mass and gauge boson mass gap
effects, the longitudinal and Higgs boson sector as well as mixing
contributions including CKM effects for massive quarks. Two loop arguments are
interpreted in the context of the effective high energy effective theory based
on the Standard Model Lagrangian in the symmetric basis with the appropriate
matching conditions to include the soft QED regime. The result is expressed in
exponentiated operator form in a CKM-extended isospin space in the symmetric
basis. Thus, a full electroweak SL treatment based on the infrared evolution
equation method is formulated for arbitrary high energy processes at future
colliders. Comparisons with known results are presented.


title: Dressed gluon exponentiation

abstract:
  Perturbative and non-perturbative aspects of differential cross-sections
close to a kinematic threshold are studied applying ``dressed gluon
exponentiation'' (DGE). The factorization property of soft and collinear gluon
radiation is demonstrated using the light-cone axial gauge: it is shown that
the singular part of the squared matrix element for the emission of an
off-shell gluon off a nearly on-shell quark is universal. We derive a
generalized splitting function that describes the emission probability and show
how Sudakov logs emerge from the phase-space boundary where the gluon
transverse momentum vanishes. Both soft and collinear logs associated with a
single dressed gluon are computed through a single integral over the
running-coupling to any logarithmic accuracy. The result then serves as the
kernel for exponentiation. The divergence of the perturbative series in the
exponent indicates specific non-perturbative corrections. We identify two
classes of observables according to whether the radiation is from an
initial-state quark, as in the Drell-Yan process, or a final-state quark,
forming a jet with a constrained invariant mass, as in fragmentation functions,
event-shape variables and deep inelastic structure functions.


title: D and rho Mesons: Who resolves whom?

abstract:
  The DDrho form factor is evaluated in a QCD sum rule calculation for both D
and rho off-shell mesons. We study the double Borel sum rule for the three
point function of two pseudoscalar and one vector meson currents. We find that
the momentum dependence of the form factors is very different if the D or the
rho meson is off-shell, but they lead to the same coupling constant in the
DDrho vertex. We discuss two different approaches to extract the DDrho coupling
constant.


title:
A systematic study of QCD coupling constant from deep inelastic
  measurements

abstract:
  We reanalyze deep inelastic scattering data of BCDMS Collaboration by
including proper cuts of ranges with large systematic errors. We perform also
the fits of high statistic deep inelastic scattering data of BCDMS, SLAC, NM
and BFP Collaborations taking the data separately and in combined way and find
good agreement between these analyses. We extract the values of both the QCD
coupling constant \alpha_s(M^2_Z) up to NLO level and of the power corrections
to the structure function F_2. The fits of the combined data for the nonsinglet
part of the structure function F_2 predict the coupling constant value
\alpha_s(M^2_Z) = 0.1174 \pm 0.0007 (stat) \pm 0.0019 (syst) \pm 0.0010
(normalization) (or QCD parameter \Lambda^{(5)}_{MSbar} = 204 \pm 25 (total
exper.err.) MeV). The fits of the combined data for both: the nonsinglet part
and the singlet one, lead to the values \alpha_s(M^2_Z) = 0.1177 \pm 0.0007
(stat) \pm 0.0021 (syst) \pm 0.0009 (normalization) (or QCD parameter
\Lambda^{(5)}_{MSbar} = 208 \pm 27 (total exper.err.) MeV). Both above values
are in very good agreement with each other. We estimate theoretical
uncertainties for \alpha_s(M^2_Z) as +0.0047 and -0.0057 from fits of the
combine data, when complete singlet and nonsinglet Q^2 evolution is taken into
account.


title: Baryogenesis in theories with large extra spatial dimensions

abstract:
  We describe a simple and predictive scenario for baryogenesis in theories
with large extra dimensions which resembles Affleck-Dine baryogenesis. The
Affleck-Dine field is a complex scalar field carrying a $U(1)_{\chi}$ charge
which is dynamically broken after the end of inflation. This generates an
excess of $\chi$ over $\bar \chi$, which then decays into Standard Model
fermions to produce an excess of baryons over anti-baryons. Our model is very
constrained because the Affleck-Dine field has to be sufficiently flat during
inflation. It is also a source for density fluctuations which can be tested in
the coming satellite and balloon experiments.


title: $\Delta F=2$ processes in the MSSM in large $\tan\beta$ limit

abstract:
  We discuss corrections to $\Delta M_{B_d}$, $\Delta M_{B_s}$ and to the CP
violation parameter $\epsilon$ in two examples of (generalized) minimal flavour
violation models: 2HDM and MSSM in the large $\tan\beta$ limit. We show that
for $H^+$ not too heavy, $\Delta M_{B_s}$ in the MSSM with heavy sparticles can
be substantially smaller than in the SM due the charged Higgs box contributions
and in particular due to the growing like $\tan^4\beta$ contribution of the
double penguin diagrams involving neutral Higgs boson exchanges.


title:
Decay constants, light quark masses and quark mass bounds from light
  quark pseudoscalar sum rules

abstract:
  The flavor $ud$ and $us$ pseudoscalar correlators are investigated using
families of finite energy sum rules (FESR's) known to be very accurately
satisfied in the isovector vector channel. It is shown that the combination of
constraints provided by the full set of these sum rules is sufficiently strong
to allow determination of both the light quark mass combinations $m_u+m_d$,
$m_s+m_u$ and the decay constants of the first excited pseudoscalar mesons in
these channels. The resulting masses and decay constants are also shown to
produce well-satisfied Borel transformed sum rules, thus providing non-trivial
constraints on the treatment of direct instanton effects in the FESR analysis.
The values of $m_u+m_d$ and $m_s+m_u$ obtained are in good agreement with the
values implied by recent hadronic $\tau$ decay analyses and the ratios obtained
from ChPT. New light quark mass bounds based on FESR's involving weight
functions which strongly suppress spectral contributions from the excited
resonance region are also presented.


title:
Parton Distributions in Nucleon on the Basis of a Relativistic
  Independent Quark Model

abstract:
  At a low resolution scale with $Q^2={\mu}^2$ corresponding to the nucleon
bound state; deep inelastic unpolarized structure functions $F_1(x,{\mu}^2)$
and $F_2(x,{\mu}^2)$ are derived with correct support using the symmetric part
of the hadronic tensor under some simplifying assumptions in the Bjorken limit.
For doing this; the nucleon in its ground state has been represented by a
suitably constructed momentum wave packet of its valence quarks in their
appropriate SU(6) spin flavor configuration with the momentum probability
amplitude taken phenomenologically in reference to the independent quark model
of scalar-vector harmonic potential. The valence quark distribution functions
$u_v(x,{\mu}^2)$ and $d_v(x,{\mu}^2)$, extracted from the structure function
$F_1(x,{\mu}^2)$ in a parton model interpretation, satisfy normalization
constraints as well as the momentum sum-rule requirements at a bound state
scale of ${\mu}^2=0.1 GeV^2$. QCD evolution of these distribution functions
taken as the inputs; yields at $Q_0^2=15 GeV^2; xu_v(x,Q_0^2)$ and
$xd_v(x,Q_0^2)$ in good qualitative agreement with the experimental data. The
gluon distribution $G(x,Q_0^2)$ and the sea-quark distribution $q_s(x,Q_0^2)$;
which are dynamically generated using the leading order renormalization group
equation; also match reasonably well with the available experimental data.


title: Symmetries and wavelets

abstract:
  Wavelet analysis of different patterns reveals some symmetries and
singularities otherwise hidden in the pattern. Its general methods are briefly
reviewed. Examples from turbulence, cavitation, Cherenkov gluon emission and
quark-gluon jets structure in QCD are considered.


title:
Lepton flavor conserving Z -> l^+ l^-$ decays in the general two Higgs
  doublet model

abstract:
  We calculate the new physics effects to the branching ratios of the lepton
flavor conserving decays Z -> l^+ l^- in the framework of the general two Higgs
Doublet model. We predict the upper limits for the couplings
|\bar{\xi}^{D}_{N,\mu\tau}| and |\bar{\xi}^{D}_{N,\tau\tau}| as 3\times 10^2
GeV and 1\times 10^2 GeV, respectively.


title: Chiral perturbation theory and kaon physics

abstract:
  A brief survey of applications of chiral perturbation theory to both
semileptonic and nonleptonic kaon decays is presented. Special emphasis is
given to recent theoretical advances related to semileptonic decays, in
particular pion pion scattering and Ke4 decays. The systematic approach for
including isospin violation and electromagnetic corrections in semileptonic
decays is discussed for Kl3 decays.


title:
Two Topics in QCD Sum-Rules: Bounds on Light Quark and Scalar Gluonium
  Masses

abstract:
  QCD Laplace sum-rules are briefly reviewed and two sum-rule applications are
presented. For scalar gluonium, upper bounds on the lightest state are obtained
from ratios of Laplace sum-rules, and the role of instantons and the low-energy
theorem on these bounds is investigated. For the light-quark masses,
fundamental inequalities for Laplace sum-rules are developed, which lead to a
lower bound on the average of the up and down quark masses.


title:
Top Quark Threshold Production at a gamma-gamma Collider at
  Next-to-Next-to-Leading Order

abstract:
  The next-to-next-to-leading order (NNLO) QCD corrections to top quark
threshold pair production in gamma-gamma collisions are computed. The NNLO
effects turn out to be significant. Threshold cross sections in gamma-gamma and
e+e- collisions are compared.


title: Signals For Extra Dimensions at the VLHC

abstract:
  A brief overview of the signatures for several different models with extra
dimensions at the stage II, $\sqrt s=175-200$ TeV VLHC is presented. In all
cases the search reaches for these models in the Drell-Yan channel are found to
be in the range of 15-80 TeV.


title: Extra Dimensional Signatures for CLIC

abstract:
  A brief overview is presented of the signatures for several different models
with extra dimensions at CLIC, an $e^+e^-$ linear collider with a center of
mass energy of 3-5 TeV and an integrated luminosity of order 1 $ab^{-1}$. In
all cases the search reach for the resulting new physics signatures is found to
be in the range of $\simeq$15-80 TeV.


title: Supersymmetry Structure and Phenomena

abstract:
  A fairly non-technical introduction to and survey of supersymmetry
phenomenology with pedagogical emphasis, including exercises. Suitable for both
theorists and experimentalists. The manuscript appeared as a Springer-Verlag
monograph in physics. The body of the manuscript is provided here with the
publisher`s permission.

categories: hep-ph astro-ph cond-mat hep-ex hep-lat hep-th nucl-th quant-ph


title:
Photoproduction of charmed vector mesons, $\gamma+N\to {\cal B}_c
  +\overline{D^*}$, with ${\cal B}_c=\Lambda_c$ or $\Sigma_c$

abstract:
  The energy and the angular dependence of the associative vector charmed
${D^*}$-meson photoproduction, $\gamma+N\to {\cal B}_c+ \overline{D^*}$, with
${\cal B}_c=\Lambda_c$ or $\Sigma_c$, has been predicted in framework of
pseudoscalar D-meson exchange model. The behavior of the cross section is
driven by phenomenological form factors, which can be parametrized in terms of
two independent parameters. The predicted values of the cross section are
sizeable enough to be measured in the near threshold region.


title: Local Discrete Symmetry in the Brane Neighborhood

abstract:
  With the ansatz that there exist local or global discrete symmetries in the
special branes' neighborhoods, we can construct the extra dimension models with
only zero modes, or the models which have large extra dimensions and
arbitrarily heavy KK modes because there is no simple relation between the mass
scales of extra dimensions and the masses of KK states. In addition, the bulk
gauge symmetry and supersymmetry can be broken on the special branes for all
the modes, and in the bulk for the zero modes by local and global discrete
symmetries. To be explicit, we discuss the supersymmetric SU(5) model on
$M^4\times S^1/Z_2$ in which there is a local $Z_2'$ symmetry in the special
3-brane neighborhood along the fifth dimension.


title:
Diffractive dissociation and saturation scale from non-linear evolution
  in high energy DIS

abstract:
  This paper presents the first numerical solution to the non-linear evolution
equation for diffractive dissociation processes in deep inelastic scattering.
It is shown that the solution depends on one scaling variable $\tau = Q^2/Q^{D
2}_s(x,x_0)$, where $Q^D_s(x,x_0)$ is the saturation scale for the diffraction
processes. The dependence of the saturation scale $Q^D_s(x,x_0)$ on both $x$
and $x_0$ is investigated, ($Y_0 = \ln(1/x_0)$ is a minimal rapidity gap for
the diffraction process). The $x$ - dependence of $Q^D_s$ turns out to be the
same as of the saturation scale in the total inclusive DIS cross section. In
our calculations $Q^D_s(x,x_0)$ reveals only mild dependence on $x_0$. The
scaling is shown to hold for $x \ll x_0$ but is violated at $ x \sim x_0$.


title: Matching the Electroweak Penguins $Q_7$, $Q_8$ and Spectral Correlators

abstract:
  Exact analytical expressions for the $\Delta S=1$ coupling $\im G_E$ in terms
of observable spectral functions are given. This coupling determines the size
of the $\Delta I=3/2$ contribution to $\epsilon'$. We show analytically how the
scheme-dependence and scale dependences vanish to all orders in $1/N_c$ and NLO
in $\alpha_S$ explicitly both for $Q_7$ and $Q_8$.
  Numerical results are derived for both $Q_7$ and $Q_8$ from the $\tau$-data
and known results on the scalar spectral functions. In particular we study the
effect of all higher dimension operators.
  The coefficients of the leading operators in the OPE of the needed
correlators are derived to NLO in $\alpha_S$.


title:
Next-to-leading order QCD evolution of transversity fragmentation
  functions

abstract:
  We derive the next-to-leading order splitting kernels for the scale evolution
of fragmentation functions for transversely polarized quarks into transversely
polarized hadrons.


title:
c,b quark masses and f_D_(s), f_B_(s) decay constants from pseudoscalar
  sum rules in full QCD to order alpha_s^2

abstract:
  The pseudoscalar sum rules of the heavy-light quark systems are used for
extracting simultaneously the c,b quark masses and the decay constants
f_D_(s),f_B_(s) of the D_(s),B_(s) mesons. To order alpha_s^2, one obtains the
running quark masses: m_c(m_c)=(1.10 \pm 0.04) GeV, m_b(m_b)=(4.05\pm 0.06)
GeV, the perturbative pole masses: M_c=(1.46\pm 0.04) GeV, M_b=(4.69\pm 0.06)
GeV, and the decay constants: f_D=(205\pm 20) MeV, f_B=(203\pm 23) MeV and
f_D_s=(235\pm 24) MeV, f_B_s=(236\pm 30) MeV, in the normalization where f_\pi=
130.56 MeV. The fitted values of the pole and running masses satisfy quite well
their three-loop perturbative relation. The value f_D = f_B confirms earlier
findings from the sum rule that the 1/M_P^1/2 heavy quark symmetry scaling law
is affected by large 1/M_P corrections.


title: Low x Scattering as a Critical Phenomenon

abstract:
  We discuss deep inelastic scattering at low $x$ as a critical phenomenon in
2+1 space-time dimensions. QCD (SU2) near the light cone becomes a critical
theory in the limit of $\lim x \to 0$ with a correlation mass $m(x) \propto
x^{\nu/2}$. We conjecture that the perturbative dipole wave function of the
virtual photon in the region $1/Q<x_{\bot}<1/m$ obeys correlation scaling $\Psi
\propto (x_{\bot})^{-(1+n)}$ before exponentially decaying for distances larger
than the inverse correlation mass. This behavior combined with an $x$
-independent dipole proton cross section gives a longitudinal structure
function which shows the dominant features of the experimental data. For SU3
QCD a similar second order phase transition is possible in the presence of
quark zero modes on the light cone.


title:
Lightest-neutralino decays in R_p-violating models with dominant
  lambda^{prime} and lambda couplings

abstract:
  Decays of the lightest neutralino are studied in R_p-violating models with
operators lambda^{prime} L Q D^c and lambda L L E^c involving third-generation
matter fields and with dominant lambda^{prime} and lambda couplings.
Generalizations to decays of the lightest neutralino induced by subdominant
lambda^{prime} and lambda couplings are straightforward. Decays with the
top-quark among the particles produced are considered, in addition to those
with an almost massless final state. Phenomenological analyses for examples of
both classes of decays are presented. No specific assumption on the composition
of the lightest neutralino is made, and the formulae listed here can be easily
generalized to study decays of heavier neutralinos. It has been recently
pointed out that, for a sizable coupling lambda^{prime}_{333}, tau-sleptons may
be copiously produced at the LHC as single supersymmetric particles, in
association with top- and bottom-quark pairs. This analysis of neutralino
decays is, therefore, a first step towards the reconstruction of the complete
final state produced in this case.


title:
Yukawa coupling quantum corrections to the self couplings of the
  lightest MSSM Higgs boson

abstract:
  A detailed analysis of the top-quark/squark quantum corrections to the
lightest CP-even Higgs boson (h^0) self-couplings is presented in the MSSM. By
considering the leading one-loop Yukawa-coupling contributions of O(m_t^4), we
discuss the decoupling behaviour of these corrections when the top-squarks are
heavy compared to the electroweak scale. As shown analytically and numerically,
the large corrections can almost completely be absorbed into the h^0-boson
mass. Our conclusion is that the h^0 self-couplings remain similar to the
coupling of the SM Higgs boson for a heavy top-squark sector.


title:
Vacuum stability bounds in Anomaly and Gaugino Mediated SUSY breaking
  models

abstract:
  We constrain the parameter space of the minimal and gaugino-assisted anomaly
mediation, and gaugino mediation models by requiring that the electroweak
vacuum corresponds to the deepest minimum of the scalar potential. In the
framework of anomaly mediation models we find strong lower bounds on slepton
and squark masses. In the gaugino mediation models the mass spectrum is forced
to be at the TeV scale. We find extensive regions of the parameter space which
are ruled out, even at low tan(beta). The implications of these results on the
g-2 of the muon are also analyzed.


title: SU(4)_c x SU(2)_L x SU(2)_R model from 5D SUSY SU(4)_c x SU(4)_{L+R}

abstract:
  We investigate supersymmetric $SU(4)_c\times SU(4)_{L+R}$ theory in 5
dimensions whose compactification on a $S^{(1)}/Z_2$ orbifold yields N=1
supersymmetric $SU(4)_c\times SU(2)_L\times SU(2)_R$ supplemented by a
$\tl{U}(1)$ gauge symmetry. We discuss how the $\mu $ problem is resolved, a
realistic Yukawa sector achieved, and a stable proton realized. Neutrino masses
and oscillations are also briefly discussed.


title:
Beyond the soft photon approximation in radiative production and decay
  of charged vector mesons

abstract:
  We study the effects of model-dependent contributions and the electric
quadrupole moment of vector mesons in the decays $V^- \to P^-P^0\gamma$ and
$\tau^- \to \nu V^-\gamma$. Their interference with the amplitude originating
from the radiation due to electric charges vanishes for photons emitted
collinearly to the charged particle in the final state. This brings further
support to our claim in previous works, that measurements of the photon energy
spectrum for nearly collinear photons in those decays are suitable for a first
measurement of the magnetic dipole moment of charged vector mesons.


title:
Yukawa Coupling Unification in SO(10) Supersymmetric Grand Unified
  Theories

abstract:
  We report on a preferred region of supersymmetric parameter space by t, b,
tau Yukawa unification. We find a narrow region survives for mu > 0 (suggested
by b --> s gamma and the anomalous magnetic moment of the muon) with A_0 \sim -
2 m_{16}, m_{16} > 1200 GeV, mu, M_{1/2} << m_{16} and tan \beta \sim 50 \pm 2.
Demanding Yukawa unification thus makes definite predictions for Higgs and
sparticle masses.


title: Muon g-2 and Implications for Supersymmetry

abstract:
  A brief review is given of the implications of the recent Brookhaven result
on the muon anomaly ($a_{\mu}$) for supersymmetry. We focus mainly on the
implications of the recent results for the minimal supergravity unified model.
We show that the observed difference implies the existence of sparticles most
of which should become observable at the Large Hadron Collider. Further, as
foreseen in works prior to the Brookhaven experiment the sign of the difference
between experimental prediction of $a_{\mu}$ and its Standard Model value
determines the sign of the Higgs mixing parameter $\mu$. The $\mu$ sign has
important implications for the direct detection of dark matter. Implications of
the Brookhaven result for other low energy phenomena are also discussed.


title:
Consistent treatment for valence and nonvalence configurations in
  semileptonic weak deacys

abstract:
  We discuss the semileptonic weak decays of $P\to P$ ($P$ denotes a
pseudoscalar meson). In these timelike processes, the problem of the nonvalence
contribution is solved systematically as well as the valence one. These
contributions are related to the light-front quark model (LFQM), and the
numerical results show the nonvalence contribution of the light-to-light
transition is larger than of the heavy-to-light one. In addition, the relevant
CKM matrix elements are calculated. They are consistent with the data of
Particle Data Group.


title:
An Approach Toward the Numerical Evaluation of Multi-Loop Feynman
  Diagrams

abstract:
  A scheme for systematically achieving accurate numerical evaluation of
multi-loop Feynman diagrams is developed. This shows the feasibility of a
project aimed to produce a complete calculation for two-loop predictions in the
Standard Model. As a first step an algorithm, proposed by F. V. Tkachov and
based on the so-called generalized Bernstein functional relation, is applied to
one-loop multi-leg diagrams with particular emphasis to the presence of
infrared singularities, to the problem of tensorial reduction and to the
classification of all singularities of a given diagram. Successively, the
extension of the algorithm to two-loop diagrams is examined. The proposed
solution consists in applying the functional relation to the one-loop
sub-diagram which has the largest number of internal lines. In this way the
integrand can be made smooth, a part from a factor which is a polynomial in the
vector of Feynman parameters needed for the complementary sub-diagram with the
smallest number of internal lines. Since the procedure does not introduce new
singularities one can distort the integration hyper-contour into the complex
hyper-plane, thus achieving numerical stability. The algorithm is then modified
to deal with numerical evaluation around normal thresholds. Concise and
practical formulas are assembled and presented, numerical results and
comparisons with the available literature are shown and discussed for the
so-called sunset topology.


title: Inclusive density of secondaries in heavy ion collisions

abstract:
  The inclusive density of charged secondaries produced in high energy heavy
ion collisions are calculated in the framework of multiple scattering theory
and quark-gluon string model. The obtained results are in agreement with the
data only assuming rather large inelastic screening/percolation effects. We
predict the total saturation of relative inclusive densities in dependence on
the number of interacting nucleon. Predictions for LHC are also given.


title: Are Constants Constant?

abstract:
  The prospect of a time-dependent Higgs vacuum expectation value is examined
within the standard model of electroweak interactions. It is shown that the
classical equation of motion for the Higgs field admits a solution that is a
doubly-periodic function of time. The corresponding Dirac equation for the
electron field is equivalent to a second order differential equation with
doubly-periodic coefficients. In the limit of very large primitive period of
the Higgs background this equation can be solved in WKBJ approximation, showing
plane-wave solutions with a time-dependent distortion factor which can be made
arbitrarily small.


title:
A Practical Approach for Exponentiation of QED Corrections in Arbitrary
  Processes

abstract:
  It is a well-known fact that, among the electroweak corrections, QED
radiation gives the largest contribution and the needed precision requires a
re-summation of the large logarithms which show up in perturbation theory. For
two fermion annihilation processes initial state radiation is a definable,
gauge-invariant, concept and one has general tools to deal with it; the
structure function approach and also the parton-shower method. However, when
one tries to apply the algorithm to four-fermion processes that include
non-annihilation channels a problem is faced: is it still possible to include
QED corrections by making use of the standard tools? A systematization is
attempted of several, recently proposed, algorithms. In particular, it is shown
that starting from the exponentiation of soft photons one can still derive a
description of QED radiation in terms of structure functions, i.e. the kernel
for the hard scattering is convoluted with generalized structure functions
where each of them is no longer function of one scale.


title:
The Ginzburg-Landau Free Energy Functional of Color Superconductivity at
  Weak Coupling

abstract:
  We derive the Ginzburg-Landau free energy functional of color
superconductivity in terms of the thermal diagrams of QCD in its perturbative
region. The zero mode of the quadratic term coefficient yields the same
transition temperature, including the pre-exponential factor, as the one
obtained previously from the Fredholm determinant of the two quark scattering
amplitude. All coefficients of the free energy can be made identical to those
of a BCS model by setting the Fermi velocity of the latter equal to the speed
of light. We also calculate the induced symmetric color condensate near $T_c$
and find that it scales as the cubic power of the dominant antisymmetric color
component. We show that in the presence of an inhomogeneity and a nonzero gauge
potential, while the color-flavor locked condensate dominates in the bulk, the
unlocked condensate, the octet, emerges as a result of a simultaneous
color-flavor rotation in the core region of a vortex filament or at the
junction of super and normal phases.


title:
Baryon form factors at high momentum transfer and generalized parton
  distributions

abstract:
  Nucleon form factors at high momentum transfer |t| are treated in the
framework of generalized parton distributions (GPD's). The possibility of
obtaining information about parton high transverse momentum components by
application of GPD's to form factors is discussed. This is illustrated by
applying an ad-hoc 2-body parton wave function to elastic nucleon form factors
F1 and F2, the N to Delta magnetic form factor G*M, and wide angle Compton
scattering (WACS) form factor R1.


title: Signatures of Doubly Charged Higgs Bosons in e gamma Collisions

abstract:
  We study the discovery potential for doubly charged Higgs bosons, Delta^--,
in the process e- gamma -> e+ mu- mu- for centre of mass energies appropriate
to high energy e^+e^- linear colliders and the CLIC proposal. For M_Delta <
sqrt{s}_{e gamma} discovery is likely for even relatively small values of the
Yukawa coupling to leptons. However, even far above threshold, evidence for the
Delta can be seen due to contributions from virtual intermediate Delta's
although, in this case, mu- mu- final states can only be produced in sufficient
numbers for discovery for relatively large values of the Yukawa couplings.


title: On Electron-Positron Annihilation into Nucleon-Antinucleon Pairs

abstract:
  We discuss the puzzling experimental results on baryon-antibaryon production
in e+e- annihilation close to the threshold, in particular the fact that
sigma(e+e- --> nbar n) >~ sigma(e+e- --> pbar p). We discuss an interpretation
in terms of a two-step process, via an intermediate coherent isovector state
serving as an intermediary between e+e- and the baryon-antibaryon system. We
provide evidence that the isovector channel dominates both e+e- --> pions and
from Nbar N annihilation at rest, and show that the observed ratio of
sigma(e+e- --> nbar n)/sigma(e+e- --> pbarp p) can be understood quantitatively
in this picture.


title:
Light Goldstone boson and domain walls in the $K^0$-condensed phase of
  high density quark matter

abstract:
  It is pointed out that $K^0$ condensation in high density matter gives rise
to an extremely light Goldstone boson whose mass comes entirely from weak
interactions. This implies the existence of metastable non-topological domain
walls with a long lifetime. We comment on the mass of the superfluid mode if
baryon number is violated.


title:
Testing radiative neutrino mass generation via R-parity violation at the
  Tevatron

abstract:
  An R-parity violating SUSY model with lepton-number violating couplings
$\lambda'_{i33}$, i=2,3 can generate a neutrino mass spectrum that explains the
recent results from neutrino oscillation experiments. These R-parity violating
couplings lead to a clean signal with at least one isolated lepton and at least
three tagged $b$ jets that is accessible in chargino and neutralino production
at the Tevatron collider. This signature can be probed at $3 \sigma$ up to
$m_{1/2} = 230$ GeV (320 GeV) with an integrated luminosity of $2 fb^{-1}$ ($30
fb^{-1}$).


title: Quantum Numbers of AGUT Higgs Fields from the Quark-Lepton Spectrum

abstract:
  A series of Higgs field quantum numbers in the anti-grand unification model,
based on the gauge group $SMG^3 \times U(1)_f$, is tested against the spectrum
of quark and lepton masses and mixing angles. A more precise formulation of the
statement that the couplings are assumed of order unity is given. It is found
that the corrections coming from this more precise assumption do not contain
factors of order of the number of colours, $N_c= 3$, as one could have feared.
We also include a combinatorial correction factor, taking account of the
distinct internal orderings within the chain Feynman diagrams in our
statistical estimates. Strictly speaking our model predicts that the
uncertainty in its predictions and thus the accuracy of our fits should be $\pm
60\%$. Many of the best fitting quantum numbers give a higher accuracy fit to
the masses and mixing angles, although within the expected fluctuations in a
$\chi^2$. This means that our fit is as good as it can possibly be.


title: The DVCS Measurement at HERA

abstract:
  The recent results of the studies of Deeply Virtual Compton Scattering (DVCS)
events at HERA are presented. The possibility offered by this process to gain
information about skewed parton distributions (SPD) is emphasized.


title: PYTHIA 6.2 Physics and Manual

abstract:
  The PYTHIA program can be used to generate high-energy-physics `events', i.e.
sets of outgoing particles produced in the interactions between two incoming
particles. The objective is to provide as accurate as possible a representation
of event properties in a wide range of reactions, with emphasis on those where
strong interactions play a role, directly or indirectly, and therefore
multihadronic final states are produced. The physics is then not understood
well enough to give an exact description; instead the program has to be based
on a combination of analytical results and various QCD-based models. This
physics input is summarized here, for areas such as hard subprocesses, initial-
and final-state parton showers, beam remnants and underlying events,
fragmentation and decays, and much more. Furthermore, extensive information is
provided on all program elements: subroutines and functions, switches and
parameters, and particle and process data. This should allow the user to tailor
the generation task to the topics of interest.
  The information in this edition of the manual refers to PYTHIA version 6.200,
of 31 August 2001.
  The official reference to the latest published version is T. Sj\"ostrand, P.
Ed\'en, C. Friberg, L. L\"onnblad, G. Miu, S. Mrenna and E. Norrbin, Computer
Physics Commun. 135 (2001) 238.


title: Non-linear evolution and high energy diffractive production

abstract:
  The ratio of the diffractive production to the total cross section in DIS is
computed as a function of the produced mass. The analysis is based on the
solution to the non-linear evolution equation for the diffraction dissociation
in DIS.
  The obtained ratios almost do not depend on the central mass energy in
agreement with the HERA experimental data. This independence is argued to be a
consequence of the scaling phenomena displayed by the cross sections.
  As a weakness point a significant discrepancy between the data and the
obtained results is found in the absolute values of the ratios. Several
explanatory reasons are discussed.


title: Cosmon dark matter?

abstract:
  We investigate if the fluctuations of the scalar field mediating quintessence
-- the cosmon -- can play an important role in cosmology. Small fluctuations
with short wavelength behave similar to a relativistic gas. In contrast, the
contribution to the energy density from horizon size fluctuations may decrease
less rapidly than radiation. We discuss the possibility that the cosmon
fluctuations grow nonlinearly, form lumps and constitute the clustering dark
matter of the universe. Cosmon dark matter would lead to interesting
consequences for the equation of state and the coupling between quintessence
and dark matter.


title: Supersymmetry as a physics beyond the standard model

abstract:
  Here I briefly discuss why supersymmetry is considered a leading candidate of
physics beyond the standard model. I also highlight the salient features of
different supersymmetry breaking models. A few other symmetries, broken or
intact, asscociated with any realistic supersymmetric model are also
identified. This write-up is too simple-minded for an expert on supersymmetry.
It is basically intended for those who are busy in other areas of high energy
physics.


title:
Signals for Non-Commutative QED in $e \gamma$ and $\gamma \gamma$
  Collisions

abstract:
  We study the effects of non-commutative QED (NCQED) in fermion pair
production, gamma + gamma -> f + bar{f} and Compton scattering, e + gamma -> e
+ gamma. Non-commutative geometries appear naturally in the context of
string/M-theory and gives rise to 3- and 4-point photon vertices and to
momentum dependent phase factors in QED vertices which will have observable
effects in high energy collisions. We consider e+ e- colliders with energies
appropriate to the TeV Linear Collider proposals and the multi-TeV CLIC project
operating in gamma gamma and e gamma modes. Non-commutative scales roughly
equal to the center of mass energy of the e+ e- collider can be probed, with
the exact value depending on the model parameters and experimental factors.
However, we found that the Compton process is sensitive to Lambda_{NC} values
roughly twice as large as those accessible to the pair production process.


title: Why Nature has made a choice of one time and three space coordinates?

abstract:
  We propose a possible answer to one of the most exciting open questions in
physics and cosmology, that is the question why we seem to experience four-
dimensional space-time with three ordinary and one time dimensions. We have
known for more than 70 years that (elementary) particles have spin degrees of
freedom, we also know that besides spin they also have charge degrees of
freedom, both degrees of freedom in addition to the position and momentum
degrees of freedom. We may call these ''internal degrees of freedom '' the
''internal space'' and we can think of all the different particles, like quarks
and leptons, as being different internal states of the same particle. The
question then naturally arises: Is the choice of the Minkowski metric and the
four-dimensional space-time influenced by the ''internal space''?
  Making assumptions (such as particles being in first approximation massless)
about the equations of motion, we argue for restrictions on the number of space
and time dimensions. (Actually the Standard model predicts and experiments
confirm that elementary particles are massless until interactions switch on
masses.)
  Accepting our explanation of the space-time signature and the number of
dimensions would be a point supporting (further) the importance of the
''internal space''.


title: Finite temperature world-line formalism and analytic continuation

abstract:
  In vacuum, the world-line formalism is an efficient tool for calculating
observables in the presence of arbitrary constant external fields. The natural
frame of this formalism is the Euclidean space. At finite temperature the
analytic continuation to Minkowski space is a subtle task. We study the two
point function in scalar QED, and we figure out the problem of analytic
continuation giving a possible solution for it. We also show, in contrast to
what was claimed in the literature, that a translationally invariant world-line
Green's function could be used at finite temperature.


title:
Covariant electroweak nucleon form factors in a chiral constituent quark
  model

abstract:
  Results for the proton and neutron electric and magnetic form factors as well
asthe nucleon axial and induced pseudoscalar form factors are presented for the
chiral constituent quark model based on Goldstone-boson-exchange dynamics. The
calculations are performed in a covariant framework using the point-form
approach to relativistic quantum mechanics. The direct predictions of the model
yield a remarkably consistent picture of the electroweak nucleon structure.


title:
On the $D^0$ -- $D_s$ lifetime difference and $\tau\to 7\pi + \nu_\tau$
  decays

abstract:
  In this paper we discuss some aspects of inclusive decays of charmed mesons
and also decays of the $\tau$ lepton into $\nu_\tau + 7\pi$. We find that phase
space effects are likely to explain the observed lifetime ratio $\tau(D_s^+) /
\tau(D^0)$ = 1.17. In particular one need not appeal to a large annihilation
contribution in the inclusive $D^0$ decay which, being absent in $D_s^+$ decays
could also contribute to the enhanced $D^0$ decay rate relative to that of the
$D_s^+$. Examining a separate problem, we find that the rate for $\tau\to
\nu_\tau + 7\pi$ is almost completely dominated by the tiny phase space for the
final eight particle state. Using an effective chiral Lagrangian to estimate
the matrix element yields a branching ratio into the channel of interest far
smaller than the present upper bound.


title:
The structure of large logarithmic corrections at small transverse
  momentum in hadronic collisions

abstract:
  We consider the region of small transverse momenta in the production of
high-mass systems in hadronic collisions. By using the current knowledge on the
infrared behaviour of tree-level and one-loop QCD amplitudes at O(alpha_s^2),
we analytically compute the general form of the logarithmically-enhanced
contributions up to next-to-next-to-leading logarithmic accuracy. By comparing
the results with q_T-resummation formulae we extract the coefficients that
control the resummation of the large logarithmic contributions for both quark
and gluon channels. Our results show that within the conventional resummation
formalism the Sudakov form factor is actually process-dependent.


title:
Electroweak Radiative Corrections to Neutral-Current Drell-Yan Processes
  at Hadron Colliders

abstract:
  We calculate the complete electroweak O(alpha) corrections to pp, pbar p ->
l+l- X (l=e, mu) in the Standard Model of electroweak interactions. They
comprise weak and photonic virtual one-loop corrections as well as real photon
radiation to the parton-level processes q bar q -> gamma,Z -> l+l-. We study in
detail the effect of the radiative corrections on the l+l- invariant mass
distribution, the cross section in the Z boson resonance region, and on the
forward-backward asymmetry, A_FB, at the Fermilab Tevatron and the CERN Large
Hadron Collider. The weak corrections are found to increase the Z boson cross
section by about 1%, but have little effect on the forward-backward asymmetry
in the Z peak region. Threshold effects of the W box diagrams lead to
pronounced effects in A_FB at m(l+l-) approx 160 GeV which, however, will be
difficult to observe experimentally. At high di-lepton invariant masses, the
non-factorizable weak corrections are found to become large.


title: Electron and muon electric dipoles in supersymmetric scenarios

abstract:
  We study if a sizeable muon electric dipole can arise in supersymmetric
frameworks able to account for the tight experimental bounds on sfermion
masses, like an appropriate flavor symmetry, or like a flavor-blind mechanism
of SUSY breaking (in presence of radiative corrections charchteristic of GUT
models, or due to Yukawa couplings of neutrinos in see-saw models). In some
cases it is possible to evade the naive scaling d_mu/d_e = m_mu/m_e and obtain
a d_mu as large as 10^{-22--23} e cm. In most cases d_mu is around 10^{-24--25}
e cm and (d_mu/d_e)/(m_mu/m_e) is only slightly different from one: this ratio
contains interesting informations on the source of the dipoles and on the
texture of the lepton Yukawa matrix. We also update GUT predictions for mu -->
e gamma and related processes.


title: How well can we predict CP asymmetry in $B\to \pi\pi$, $K\pi$ decays?

abstract:
  Using the perturbative QCD amplitudes for $B\to \pi\pi$ and $B\to K\pi$, we
have performed an extensive study of the parameter space where the theoretical
predictions for the branching ratios are consistent with recent experimental
data. From this allowed range of parameter space, we predict the mixing induced
CP asymmetry for $B \to \pi^+\pi^-$ with about 11% uncertainty and the other CP
asymmetries for $B\to \pi\pi$, $K\pi$ with 40% ~ 47% uncertainty. These errors
are expected to be reduced as we restrict the parameter space by studying other
decay modes and by further improvements in the experimental data.


title:
On Analytic Properties of the Photon Polarization Function in a
  Background Magnetic Field

abstract:
  We examine the analytic properties of the photon polarization function in a
background magnetic field, using the technique of inverse Mellin transform. The
photon polarization function is first expressed as a power series of the photon
energy $\omega$ with $\omega< 2m_e$. Based upon this energy expansion and the
branch cut of the photon polarization function in the complex $\omega$ plane,
we compute the absorptive part of the polarization function with the inverse
Mellin transform. Our results are valid for arbitrary photon energies and
magnetic-field strengths. The applications of our approach are briefly
discussed.


title:
Effects and influences on neutrino oscillations due to a thin density
  layer perturbation added to a matter density profile

abstract:
  In this paper, we show the effects on the transition probabilities for
neutrino oscillations due to a thin constant density layer perturbation added
to an arbitrary matter density profile. In the case of two neutrino flavors, we
calculate the effects both analytically and numerically, whereas in the case of
three neutrino flavors, we perform the studies purely numerically. As an
realistic example we consider the effects of the Earth's atmosphere when added
to the Earth's matter density profile on the neutrino oscillation transition
probabilities for atmospheric neutrinos.


title: Graviton emission from a soft brane

abstract:
  Theories with compact extra spatial dimensions felt only by gravity are
subject to direct experimental tests if the compactification volume is large.
Estimates of high-energy collider observables induced by graviton radiation
into extra dimensions are usually given assuming rigid branes. This may
overestimate the accessibility of these theories. Brane fluctuations soften the
coupling of graviton radiation, and reduce our ability to see effects in
high-energy collisions. We calculate the size of this suppression on single jet
plus gravitons at the LHC and single photon plus gravitons at an e+e- linear
collider. We advocate the use of a brane softening variable as an additional
parameter when comparing theory predictions to data.


title: Frame Dependence of Spin-One Angular Conditions in Light Front Dynamics

abstract:
  We elaborate the frame dependence of the angular conditions for spin-1 form
factors. An extra angular condition is found in addition to the usual angular
condition relating the four helicity amplitudes. Investigating the
frame-dependence of the angular conditions, we find that the extra angular
condition is in general as complicated as the usual one, although it becomes
very simple in the $q^+ = 0$ frame involving only two helicity amplitudes. It
is confirmed that the angular conditions are identical in frames that are
connected by kinematical transformations. The high $Q^2$ behaviors of the
physical form factors and the limiting behaviors in special reference frames
are also discussed.


title: From SPS to RHIC: Breaking the Barrier to the Quark-Gluon Plasma

abstract:
  After 15 years of heavy-ion collision experiments at the AGS and SPS, the
recent turn-on of RHIC has initiated a new stage of quark-gluon plasma studies.
I review the evidence for deconfined quark-gluon matter at SPS energies and the
recent confirmation of some of the key ideas by the new RHIC data. Measurements
of the elliptic flow at RHIC provide strong evidence for efficient
thermalization during the very early partonic collision stage, resulting in a
well-developed quark-gluon plasma with almost ideal fluid-dynamical collective
behaviour and a lifetime of several fm/c.


title: Modifying operator product expansions by non-perturbative non-locality

abstract:
  Local quark-hadron duality violations in conventional applications of the
operator product expansion are proposed to have their origin in the fact that
the QCD vacuum or a hadronic state is not only characterized by nonvanishing
expectation values of local, gauge invariant operators but also by finite
correlation lengths of the corresponding gauge invariant $n$-point functions.
Utilizing high-resolution lattice information on these correlators a
non-perturbative component of OPE coarse graining is proposed which, in
principle, allows for a determination of the critical dimension where the
break-down of the expansion sets in.


title: Towards OPE based local quark-hadron duality: Light-quark channels

abstract:
  Various light-quark channel current-current correlators are subjected to the
concept of a non-perturbative component of coarse graining in operator product
expansions introduced in a parallel work. This procedure allows for low-energy
structure of the OPE-derived spectral function. With naive vacuum saturation
for 4 quark operators and using lattice data for the gauge invariant scalar
quark correlator the results are far off the experimentally measured behavior.
However, using the correlation length of the gauge invariant vector quark
correlator, which is about 10 times smaller than the scalar one, the
qualitative results are rather realistic. Namely, the input of information on
the mass of the lowest resonance in one channel yields the corresponding masses
within acceptable errors in other channels. Still, the shapes of the calculated
spectral functions are considerably deformed as compared to experiment. This
may be a consequence of vacuum saturation and the truncation at a mass
dimension which is below the critical dimension from which on the asymptotic
expansion does not approximate anymore. To improve on this high-resolution
lattice information on gauge invariant $n>2$ point correlators would be needed.
Motivated by the small effective correlation length in the 4 quark
contributions the relevance of the approach for heavy quark physics, in
particular in the calculation of nonleptonic, inclusive $\Delta \Gamma$, is
discussed.


title:
Non-perturbative non-locality: $V\pm A$ correlators in euclidean
  position space

abstract:
  Using an OPE modification, which takes non-perturbative non-locality into
account, the difference and sum of vector and axial-vector correlators are
evaluated in euclidean position space. For distances up to 0.8 fm the
calculated behavior is close to the instanton liquid result and the ALEPH data,
in contrast to the implications of the conventional OPE.


title: Saturation and geometric scaling in DIS at small x

abstract:
  We present various aspects of the saturation model which provides good
description of inclusive and diffractive DIS at small x. The model uses parton
saturation ideas to take into account unitarity requirements. A new scaling
predicted by the model in the small x domain is successfully confronted with
the data.


title: A Search for Vector Diquarks at the CERN LHC

abstract:
  Resonant production of the first generation vector diquarks at the CERN Large
Hadron Collider (LHC) is investigated. It is shown that the LHC will be able to
discover vector diquarks with masses up to 9 TeV for quark-diquark-quark
coupling alpha_(D)=0.1 and 4 TeV for alpha_(D)=5x10^(-4).


title:
A Critical Examination to the Unitarized $\pi\pi$ Scattering Chiral
  Amplitudes

abstract:
  We discuss the Pad\'e approximation to the $\pi\pi$ scattering amplitudes in
1--loop chiral perturbation theory. The approximation restores unitarity and
can reproduce the correct resonance poles, but the approximation violates
crossing symmetry and produce spurious poles on the complex $s$ plane and
therefore plagues its predictions on physical quantities at quantitative level.
However we find that one virtual state in the IJ=20 channel may have physical
relevance.


title:
Structural Change of Cooper Pairs and Momentum-dependent Gap in Color
  Superconductivity

abstract:
  The two-flavor color superconductivity is studied over a wide range of baryon
density with a single model. We pay a special attention to the spatial-momentum
dependence of the gap and to the spatial-structure of Cooper pairs. At
extremely high baryon density (O(10^{10} rho_0) with rho_0 being the normal
nuclear matter density), our model becomes equivalent to the usual perturbative
QCD treatment and the gap is shown to have a sharp peak near the Fermi surface
due to the weak-coupling nature of QCD. On the other hand, the gap is a smooth
function of the momentum at lower densities (O(10 rho_0)) due to strong color
magnetic and electric interactions. To study the structural change of Cooper
pairs from high density to lower density, quark correlation in the color
superconductor is studied both in the momentum space and in the coordinate
space. The size of the Cooper pair is shown to become comparable to the
averaged inter-quark distance at low densities. Also, effects of the
momentum-dependent running coupling and the antiquark pairing, which are both
small at high density, are shown to be non-negligible at low densities. These
features are highly contrasted to the standard BCS superconductivity in metals.


title: Timelapse

abstract:
  We discuss the existence in an arbitrary frame of a finite time for the
transformation of an initial quantum state into another e.g. in a decay.
  This leads to the introduction of a timelapse $\tilde{\tau}$ in analogy with
the lifetime of a particle. An argument based upon the Heisenberg uncertainty
principle suggests the value of $\tilde{\tau}=1 / M_0$. Consequences for the
exponential decay formula and the modifications that $\tilde{\tau}$ introduces
into the Breit-Wigner mass formula are described.


title:
Lepton flavor violating process in a supersymmetric grand unified theory
  with right-handed neutrino

abstract:
  Motivated from the recent results of neutrino oscillation experiment, we
investigated lepton flavor violating (LFV) processes in a SU(5) supersymmetric
grand unified theory with right-handed neutrino. The current experimental upper
bound for $\mu \to e\gamma$ process gives already some constraint on the model.
Correlation between $\mu \to e \gamma$ and the SUSY contribution to the muon
anomalous magnetic moment is also discussed. Future LFV experiments will give
considerable impacts on this type of SUSY GUT models equipped with seesaw
neutrino mass generation.


title: Gluon, Quark and Hadron Masses from a Modified Perturbative QCD

abstract:
  The development of a Modified Perturbation Theory for QCD, introduced in
previous works, is continued. The gluon propagator is modified as consequence
of a soft gluon pairs condensate in the vacuum. The modified Feynman rules for
$\alpha=1$ are shown, and some physical magnitudes calculated with them. The
mean value of $G^{2}$, gluon masses and the effective potential are calculated
up to the $g^2$ order, improving previous calculations. In connection with the
gluon self-energy it follows that the gluonic mass shell becomes tachyonic in
the considered approximation. The constituent quarks masses, produced by the
influence of the condensate, are also calculated. Results of the order of 1/3
of the nucleon mass, are obtained for the constituent masses of the up and down
quarks. In addition, the predicted flavour dependence of the calculated quarks
masses turns out to be the appropriate to reproduce the spectrum of the ground
states within the various groups of hadronic resonances, through the simple
addition of their constituent quark masses. Finally, the generalization of the
theory for arbitrary values of the $\alpha$ gauge parameter is explored.


title:
Energy Independent Solution to the Solar Neutrino Anomaly including the
  SNO data

abstract:
  The global data on solar neutrino rates and spectrum, including the SNO
charged current rate, can be explained by LMA, LOW or the energy independent
solution -- corresponding to near-maximal mixing. All the three favour a mild
upward renormalisation of the Cl rate. A mild downward shift of the $B$
neutrino flux is favoured by the energy independent and to a lesser extent the
LOW solution, but not by LMA. Comparison with the ratio of SK elastic and SNO
charged current scattering rates favours the LMA over the other two solutions,
but by no more than $1.5\sigma$.


title: E_6 Unification with Bi-Large Neutrino Mixing

abstract:
  A scenario of SO(10) grand unified theory (GUT) proposed by one of the
authors is extended to E_6 unification. This gives realistic quark and lepton
mass matrices. In neutrino sector, the model reproduces large mixing angle
(LMA) MSW solution as well as large mixing angle for atmospheric neutrino
anomaly. In this model, right-handed down quark and left-handed lepton of the
first and second generation belong to a single multiplet 27. This causes
natural suppression of flavor changing neutral current(FCNC).


title: Forward jets and forward $W$-boson production at hadron colliders

abstract:
  In this talk we give a short review of forward jets and forward $W$-boson
production at hadron colliders, in view of the extraction of footprints of BFKL
physics. We argue that at Tevatron energies, dijet production at large rapidity
intervals is still subasymptotic with respect to the BFKL regime, thus the
cross section is strongly dependent on the various cuts applied in the
experimental setup. In addition, the choice of equal transverse momentum cuts
on the tagging jets makes the cross section dependent on large logarithms of
non-BFKL origin, and thus may spoil the BFKL analysis. For vector boson
production in association with two jets, we argue that the configurations that
are kinematically favoured tend to have the vector boson forward in rapidity.
Thus $W + 2$ jet production lends itself naturally to extensions to the
high-energy limit.


title:
Coherent Betatron Oscillation and Induced Errors in the Experimental
  Determination of the Muon g-2 Factor

abstract:
  Precision measurements of the anomalous magnetic moment of the muon depend on
the correct collective mode assignment of the coherent betatron oscillations in
the beam. Presently, there is a disagreement between experiment and theory for
the horizontal betatron frequency. The discrepancy is here resolved by our
computations of electrostatic beam focusing. The correct treatment of the
betatron effects renders less likely the need for non-standard model
corrections to the muon g-2.


title: Subtleties in CPT-Transformation for Majorana fermions

abstract:
  We point out the relevance of the so-called Majorana creation phase in the
s-channel matrix elements in connection with the CPT-transformation of the
latter.


title:
Weak Boson Production Amplitude Zeros; Equalities of the Helicity
  Amplitudes

abstract:
  We investigate the radiation amplitude zeros exhibited by many Standard Model
amplitudes for triple weak gauge boson production processes. We show that
$WZ\gamma$ production amplitudes have especially rich structure in terms of
zeros, these amplitudes have zeros originating from several different sources.
It is also shown that TYPE I current null zone is the special case of the
equality of the specific helicity amplitudes.


title: Weak scale: Dynamical determination versus accidental stabilization

abstract:
  Is it a mere accident that the weak scale is exactly so much smaller than the
Planck scale, and at the same time exactly so much larger than the QCD scale?
Or are the experimentally-measured values of the corresponding gauge couplings
enough to help us determine dynamically these energy scales? And if nature has
indeed offered us the possibility of such a determination, why dismiss it and
fix these scales instead by means of arbitrary parameters within a multitude of
jejune theoretical frameworks which make this wonderful hierarchy seem
fortuitous?


title: Relations between N and Delta electromagnetic form factors

abstract:
  The inclusion of two-body exchange currents in the constituent quark model
leads to several new relations between the electromagnetic form factors of the
nucleon and Delta(1232). These are:(i) the neutron charge form factor can be
expressed as the difference between proton and Delta+ charge form factors, and
(ii) the N->Delta charge quadrupole (C2) transition form factor is connected to
the charge monopole (C0) form factor of the neutron. The latter relation is
used to estimate the charge radius of constituent quarks. Furthermore, we find
that exchange currents do not modify the SU(6) relation between the magnetic
N->Delta and the magnetic neutron form factors. Consequently, after including
exchange currents, the C2/M1 ratio in the N->Delta transition can be expressed
as a ratio of the elastic charge and magnetic form factors of the neutron.


title:
CP-violation in K_{S,L}->\pi^{+}\pi^{-}\gamma and
  K_{S,L}->\pi^{+}\pi^{-}e^{+}e^{-} decays

abstract:
  The dependence of K_{S,L}->\pi^{+}\pi^{-}\gamma decay probabilities on photon
polarization is calculated. The phases of terms of amplitude that arise from
the pion-pion interaction are obtained by using a simple realistic model of
pion-pion interaction via virtual \rho-meson, instead of the ChPT. The results
are compared with those of other authors and the origin of slight discrepancies
is explained. It is shown that the standard ChPT approach for K_{S,L}->
\pi^{+}\pi^{-}\gamma decays cannot reproduce the contribution of the \rho-meson
to the P-wave \pi\pi interaction. The departure of the photon spectrum from
pure bremsstrahlung due to the pion loop contribution to the direct emission
amplitude is calculated. It is shown that the interference between the terms of
amplitude with different CP-parity appears only when the photon is polarized
(linearly or circularly). Instead of measuring the linear polarization, the
angular correlation between the \pi^{+}\pi^{-} and e^{+}e^{-} planes in
K_{S,L}->\pi^{+}\pi^{-}e^{+}e^{-} decay can be studied.


title:
Contribution of higher meson resonances to the electromagnetic
  $\pi$-meson mass difference

abstract:
  Modifications of the DGMLY relation for calculation of electromagnetic
$\pi$-meson mass difference based on the Chiral Symmetry Restoration phenomenon
at high energies as well as the Operator Product Expansion of quark densities
for vector ($\rho$) and axial-vector ($a_1$) meson fields difference are
proposed. In the calculations higher meson resonances in vector and
axial-vector channels are taken into account. It is shown that the inclusion of
the first $\rho$ and $a_1$ radial excitations improves the results for
electromagnetic $\pi$-meson mass difference as compared with the previous ones.
Estimations on the electromagnetic $\rho$ and $a_1$-meson decay constants and
the constant $L_{10}$ of effective chiral Lagrangian are obtained from the
generalized Weinberg sum rules.


title:
Gravity Wave and Neutrino Bursts from Stellar Collapse: A Sensitive Test
  of Neutrino Masses

abstract:
  New methods are proposed with the goal to determine absolute neutrino masses
from the simultaneous observation of the bursts of neutrinos and gravitational
waves emitted during a stellar collapse. It is shown that the neutronization
electron neutrino flash and the maximum amplitude of the gravitational wave
signal are tightly synchronized with the bounce occuring at the end of the core
collapse on a timescale better than 1 ms. The existing underground neutrino
detectors (SuperKamiokande, SNO, ...) and the gravity wave antennas soon to
operate (LIGO, Virgo, ...) are well matched in their performance for detecting
galactic supernovae and for making use of the proposed approach. Several
methods are described, which apply to the different scenarios depending on
neutrino mixing. Given the present knowledge on neutrino oscillations, the
methods proposed are sensitive to a mass range where neutrinos would
essentially be mass-degenerate. The 95 % C.L. upper limit which can be achieved
varies from 0.75 eV/c2 for large electron neutrino survival probabilities to
1.1 eV/c2 when in practice all electron neutrinos convert into muon or tau
neutrinos. The sensitivity is nearly independent of the supernova distance.


title: The high energy limit of QCD at two loops

abstract:
  By taking the high-energy limit of the two-loop amplitudes for parton-parton
scattering, we have tested the validity of Fadin-Lipatov's ansatz for
parton-parton scattering in the high-energy limit. As expected, we have found
that it holds at LL and NLL accuracy, and hence we have independently
re-evaluated the two-loop Regge trajectory, finding full agreement with the
previous results by Fadin and collaborators. We have found, though, that the
universality implied by the ansatz is violated at the next-to-next-to-leading
logarithmic level.


title:
Two-gluon coupling and collider phenomenology of color-octet technirho
  mesons

abstract:
  It has recently been suggested that gauge invariance forbids the coupling of
a massive color-octet vector meson to two gluons. While this is true for
operators in an effective Lagrangian of dimension four or less, we demonstrate
that dimension six interactions will lead to such couplings. In the case of
technicolor, the result is a technirho-gluon-gluon coupling comparable to the
naive vector meson dominance estimate, but with a substantial uncertainty. This
has implications for several recent studies of technicolor phenomenology.


title: Leptogenesis from $\widetilde{N}$-dominated early universe

abstract:
  We investigate in detail the leptogenesis by the decay of coherent
right-handed sneutrino $\widetilde{N}$ having dominated the energy density of
the early universe, which was originally proposed by HM and TY. Once the
$\widetilde{N}$ dominant universe is realized, the amount of the generated
lepton asymmetry (and hence baryon asymmetry) is determined only by the
properties of the right-handed neutrino, regardless of the history before it
dominates the universe. Moreover, thanks to the entropy production by the decay
of the right-handed sneutrino, thermally produced relics are sufficiently
diluted. In particular, the cosmological gravitino problem can be avoided even
when the reheating temperature of the inflation is higher than $10^{10}\GeV$,
in a wide range of the gravitino mass $m_{3/2}\simeq 10\MeV$--$100\TeV$. If the
gravitino mass is in the range $m_{3/2}\simeq 10\MeV$--$1\GeV$ as in the some
gauge-mediated supersymmetry breaking models, the dark matter in our universe
can be dominantly composed of the gravitino. Quantum fluctuation of the
$\widetilde{N}$ during inflation causes an isocurvature fluctuation which may
be detectable in the future.


title: Genesis Cosmology

abstract:
  Genesis Cosmology is the combination of Genesis and a cosmology model for the
description of the first three days in Genesis. The first day involves the
emergence of the separation of light and darkness from the formless, empty, and
dark pre-universe in Genesis, corresponding to the emergence of the current
asymmetrical dual universe: the light universe and the dark universe from the
simple and dark pre-universe in Genesis Cosmology. The three stages of the
pre-universe are the strong, the gravitational, and the charged pre-universes
for the emergences of the strong, the gravitational, and the electromagnetic
force fields, respectively. The light universe is the current observable
universe, while the dark universe is sometimes hidden, and sometimes observable
as dark energy. The second day involves the separation of waters from above and
below the expanse in Genesis, corresponding to the separation of dark matter
and baryonic matter from above and below the interface between dark matter and
baryonic matter for the formation of galaxies in Genesis Cosmology. The
repulsive MOND force between dark matter and baryonic matter exists in the
interface between dark matter and baryonic matter. The third day involves the
separation of sea and land where organisms appeared in Genesis, corresponding
to the separation of interstellar medium and star with planet where organisms
are developed in Genesis Cosmology. Under the normal condition, stars and
planets are developed. Under extreme condition such as zero absolute
temperature or extremely high pressure, superconductivity and the alternative
for black hole appear. Genesis Cosmology is the unified theory that unifies
different phenomena in our observable universe.


title: Tracking QCD-Instantons

abstract:
  In a first part, I review our detailed investigation of the prospects to
discover deep-inelastic processes induced by small QCD-instantons at HERA. This
includes the essence of our calculations based on instanton-perturbation
theory, crucial lattice constraints and a confrontation of the recent
intriguing (preliminary) search results by the H1 collaboration with our
predictions. In a second part, I report on two ongoing attempts towards a
better understanding of the role of larger-size instantons in the QCD-vacuum
and in high-energy (diffractive) scattering processes, respectively: The
striking suppression of larger-size instantons in the vacuum is attributed to a
residual conformal inversion symmetry, and a precocious lack of ``color
transparency'' in the one-instanton contribution to the color-dipole scattering
picture is emphasized.


title:
Systematics of flux tubes in the dual Ginzburg-Landau theory and Casimir
  scaling hypothesis: folklore and lattice facts

abstract:
  The ratios between string tensions $\sigma_D$ of color-electric flux tubes in
higher and fundamental SU(3) representations, $d_{D} \equiv
\sigma_{D}/\sigma_{\bf 3}$, are systematically studied in a Weyl symmetric
formulation of the DGL theory. The ratio is found to depend on the
Ginzburg-Landau (GL) parameter, $\kappa \equiv m_{\chi}/m_{B}$, the mass ratio
between monopoles ($m_{\chi}$) and dual gauge bosons ($m_{B}$). While the
ratios $d_{D}$ follow a simple flux counting rule in the Bogomol'nyi limit,
$\kappa=1.0$, systematic deviations appear with increasing $\kappa$ due to
interactions between fundamental flux inside a higher representation flux tube.
We find that in a type-II dual superconducting vacuum near $\kappa = 3.0$ this
leads to a consistent description of the ratios $d_{D}$ observed in lattice QCD
simulations.


title: Vector Manifestation in Hot Matter

abstract:
  Based on the hidden local symmetry (HLS) Lagrangian as an effective field
theory of QCD, we find that the chiral symmetry restoration for hot QCD can be
realized through the Vector Manifestation where the rho meson becomes massless
degenerate with pi as the chiral partner. This is done by including, in
addition to the hadronic thermal effects due to the pi- and rho-loops, the
intrinsic temperature dependences of the parameters of the HLS Lagrangian
through the matching of the HLS with the underlying QCD.


title:
Physics of Synchronized Neutrino Oscillations Caused by
  Self-Interactions

abstract:
  In the early universe or in some regions of supernovae, the neutrino
refractive index is dominated by the neutrinos themselves. Several previous
studies have found numerically that these self-interactions have the effect of
coupling different neutrino modes in such a way as to synchronize the flavor
oscillations which otherwise would depend on the energy of a given mode. We
provide a simple explanation for this baffling phenomenon in analogy to a
system of magnetic dipoles which are coupled by their self-interactions to form
one large magnetic dipole which then precesses coherently in a weak external
magnetic field. In this picture the synchronized neutrino oscillations are
perfectly analogous to the weak-field Zeeman effect in atoms.


title: AMEGIC++ 1.0, A Matrix Element Generator In C++

abstract:
  The new matrix element generator AMEGIC++ is introduced, dedicated to
describe multi-particle production in high energy particle collisions. It
automatically generates helicity amplitudes for the processes under
consideration and constructs suitable, efficient integration channels for the
multi-channel phase space integration. The corresponding expressions for the
amplitudes and the integrators are stored in library files to be linked to the
main program.


title:
With four Standard Model families, the LHC could discover the Higgs
  boson with a few fb^-1

abstract:
  The existence of a 4th SM family would produce a large enhancement of the
gluon fusion channel of Higgs boson production at hadron colliders. In this
case, the SM Higgs boson could be seen at the CERN Large Hadron Collider (LHC)
via the golden mode (H->4l) with an integral luminosity of only a few fb^-1.


title: Azimuthal asymmetries in semi-inclusive leptoproduction

abstract:
  We point out the role of intrinsic transverse momentum of partons in the
study of azimuthal asymmetries in deep-inelastic 1-particle inclusive
leptoproduction. Leading asymmetries often appear in combination with spin
asymmetries. This leads not only to transverse momentum dependence in the
parton distribution functions, but also to functions beyond the ones known from
inclusive deep-inelastic scattering (DIS). We use Lorentz invariance and the
QCD equations of motion to study the evolution of functions that appear at
leading (zeroth) order in a 1/Q expansion in azimuthal asymmetries. This
includes the evolution equation of the Collins fragmentation function. The
moments of these functions are matrix elements of known twist two and twist
three operators. We give the evolution in the large $N_c$ limit, restricted to
the non-singlet case for the chiral-even functions.


title:
The Fadin-Lipatov-vertex in high-energy heavy quark and charmonium
  production

abstract:
  Calculations of heavy quark and charmonium hadroproduction are presented in
the k_t-factorization approach. The resulting differential cross sections are
compared to experimental values and NLO collinear predictions. The application
of the full effective Fadin-Lipatov quark-antiquark- production-vertex has an
important influence on the results and in particular leads to a strong
suppression of certain color octet contributions which are related to the
outstanding problem of the production of polarized J/Psi.


title: Elastic meson production and Compton scattering

abstract:
  I discuss recent progress in the theory of exclusive meson production and
Compton scattering, focusing on hard-scattering factorization and on the dipole
formalism.


title: Direct CP Violation In Radiative B Decays

abstract:
  We discuss the role of the radiative B decays $B \to X_{s/d} \gamma$ in our
search for new physics focusing on the issue of direct CP violation. We discuss
in some detail a SM prediction for the CP asymmetries in inclusive $b \to s/d$
transitions, namely $\mid \Delta {\cal B}(B \to X_s \gamma) + \Delta {\cal B}(B
\to X_d \gamma) \mid \sim 1 \cdot 10^{-9}$. Any measured value in significant
deviation of this estimate would indicate new sources of CP violation beyond
the CKM phase.


title: Magnetic Moment of Neutrino in Statistical Background

abstract:
  We calculate the magnetic moment of Dirac type of neutrinos in hot and dense
background for different ranges of temperature and chemical potential. The
properties of neutrinos are studied in the strong magnetic field where the
chemical potential of particles is high enough to have more particles than the
antiparticles. We show that in this situation, Weyl neutrino seems to explain
the neutrino coupling with the magnetic field due to its effective mass which
can couple with the magnetic field directly. We also investigate the
electromagnetic properties of Weyl neutrino due to its effective mass developed
in the strong magnetic field.


title: Partonic Scattering Cross Sections in the QCD Medium

abstract:
  A medium modified gluon propagator is used to evaluate the scattering cross
section for the process gg-->gg in the QCD medium by performing an explicit sum
over the polarizations of the gluons. We incorporate a magnetic sreening mass
from a non-perturbative study. It is shown that the medium modified cross
section is finite, divergence free, and is independent of any ad-hoc momentum
transfer cut-off parameters. The medium modified finite cross sections are
necessary for a realistic investigation of the production and equilibration of
the minijet plasma expected at RHIC and LHC.


title: Best Values for the CP-odd Meson-Nucleon Couplings from Supersymmetry

abstract:
  In the supersymmetric models, the dominant sources of the hadronic
flavor-diagonal CP violation at low energy are the theta term and the
chromoelectric dipole moments of quarks. Using QCD sum rules, we estimate the
preferred range and the best values for the CP-odd meson-nucleon coupling
constants induced by these operators. When the theta term is removed by the
axion mechanism, the size of the most important isospin triplet pion-nucleon
coupling is estimated to be \bar g_{\pi NN}^{(1)} = 2 times 10^{-12}(tilde d_u
- tilde d_d), where chromoelectric dipole moments are given in units of
10^{-26} cm.


title: Soft-Collinear Factorization in Effective Field Theory

abstract:
  The factorization of soft and ultrasoft gluons from collinear particles is
shown at the level of operators in an effective field theory. Exclusive
hadronic factorization and inclusive partonic factorization follow as special
cases. The leading order Lagrangian is derived using power counting and gauge
invariance in the effective theory. Several species of gluons are required, and
softer gluons appear as background fields to gluons with harder momenta. Two
examples are given: the factorization of soft gluons in B->D pi, and the
soft-collinear convolution for the B->Xs gamma spectrum.