title: On the precision of the theoretical predictions for pi pi scattering

abstract:
  In a recent paper, Pelaez and Yndurain evaluate some of the low energy
observables of pi pi scattering and obtain flat disagreement with our earlier
results. The authors work with unsubtracted dispersion relations, so that their
results are very sensitive to the poorly known high energy behaviour of the
scattering amplitude. They claim that the asymptotic representation we used is
incorrect and propose an alternative one. We repeat their calculations on the
basis of the standard, subtracted fixed-t dispersion relations, using their
asymptotics. The outcome fully confirms our earlier findings. Moreover, we show
that the Regge parametrization proposed by these authors for the region above
1.4 GeV violates crossing symmetry: Their ansatz is not consistent with the
behaviour observed at low energies.


title: Statistical hadronization of charm in heavy ion collisions

abstract:
  Production of open and hidden charm hadrons in heavy ion collisions is
considered within the statistical coalescence model (SCM). Charmed
quark-antiquark pairs are assumed to be created at the initial stage of the
reaction in hard parton collisions. The number of these pairs is conserved
during the evolution of the system. At hadronization, the charmed (anti)quarks
are distributed among open and hidden charm hadrons in accordance with laws of
statistical mechanics. Important special cases: a system with a small number of
charmed quark-antiquark pairs and charm hadronization in a subsystem of the
whole system are considered.
  The model calculations are compared with the preliminary PHENIX data for
J/psi production at RHIC. Possible influence of the in-nuclear modification of
the parton distribution functions (shadowing) on the SCM results is studied.


title:
The approach to thermalization in the classical phi^4 theory in 1+1
  dimensions: energy cascades and universal scaling

abstract:
  We study the dynamics of thermalization and the approach to equilibrium in
the classical phi^4 theory in 1+1 spacetime dimensions. At thermal equilibrium
we exploit the equivalence between the classical canonical averages and
transfer matrix quantum traces of the anharmonic oscillator to obtain exact
results for the temperature dependence of several observables, which provide a
set of criteria for thermalization. We find that the Hartree approximation is
remarkably accurate in equilibrium. The non-equilibrium dynamics is studied by
numerically solving the equations of motion in light-cone coordinates for a
broad range of initial conditions and energy densities.The time evolution is
described by several stages with a cascade of energy towards the ultraviolet.
After a transient stage, the spatio-temporal gradient terms become larger than
the nonlinear term and a stage of universal cascade emerges.This cascade starts
at a time scale t_0 independent of the initial conditions (except for very low
energy density). Here the power spectra feature universal scaling behavior and
the front of the cascade k(t) grows as a power law k(t) sim t^alpha with alpha
lesssim 0.25. The wake behind the cascade is described as a state of Local
Thermodynamic Equilibrium (LTE) with all correlations being determined by the
equilibrium functional form with an effective time dependent temperatureTeff(t)
which slowly decreases as sim t^{-alpha}.Two well separated time scales emerge
while Teff(t) varies slowly, the wavectors in the wake with k < k(t) attain LTE
on much shorter time scales.This universal scaling stage ends when the front of
the cascade reaches the cutoff at a time t_1 sim a^{-1/alpha}. Virialization
starts to set much earlier than LTE. We find that strict thermalization is
achieved only for an infinite time scale.


title: A master formula for NNLO soft and virtual QCD corrections

abstract:
  I present a master formula for the next-to-next-to-leading order (NNLO) soft
and virtual QCD corrections for any process in hadron-hadron and lepton-hadron
colliders. The formula is derived from a unified threshold resummation
formalism. Applications to various QCD processes are discussed.


title:
Measurement of tan beta in associated t H^\pm Production in gamma gamma
  Collisions

abstract:
  The ratio of neutral Higgs field vacuum expectation values, tan beta, is one
of the most important parameters to determine in type-II Two-Higgs Doublet
Models (2HDM), specifically the Minimal Supersymmetric Standard Model (MSSM).
Assuming the energies and integrated luminosity of a future high energy e^+e^-
linear collider of sqrt{s}=500, 800, 1000, and 1500 GeV and L=1 ab^{-1} we show
that associated t H^+/- production in gamma gamma collisions can be used to
make an accurate determination of tan beta for low and high tan beta by
precision measurements of the gamma gamma -> H^+/- t + X cross section.


title:
Implications of Supersymmetry Breaking with a Little Hierarchy between
  Gauginos and Scalars

abstract:
  From a theoretical point of view it is not hard to imagine gaugino masses
being much lighter than scalar masses. The dominant contributions to gaugino
masses are then their anomaly-mediated values. Given current lower bounds on
gauginos, which are near the W-mass scale, considering a little hierarchy
between weak-scale gauginos and much heavier scalars requires suspending normal
intuition on finetuning and naturalness of the Higgs potential. Nevertheless,
tantalizing perks come from the hypothesis: lessened flavor and CP violation
problems, more compatibility with gauge coupling unification and third
generation Yukawa unification, suppressed dimension-five proton decay
operators, and no problems satisfying the current Higgs mass constraint for any
value of tan(beta) consistent with the top and bottom Yukawa couplings
remaining finite up to the grand unified scale. The Tevatron has little chance
of finding any evidence of this theory given current constraints. The LHC does
well looking for pair production of gluinos which three-body decay into
potentially spectacular final states. Dark matter relic abundance can be
cosmologically interesting, but table-top experiments will not see LSPs
scattering off nucleons. On the other hand, experiments looking for
monochromatic photons from LSP annihilations in the galactic halo may find
them.


title: Reduction of the QCD string to a time component vector potential

abstract:
  We demonstrate the equivalence of the relativistic flux tube model of mesons
to a simple potential model in the regime of large radial excitation. We make
no restriction on the quark masses; either quark may have a zero or finite
mass. Our primary result shows that for fixed angular momentum and large radial
excitation, the flux tube/QCD string meson with a short-range Coulomb
interaction is described by a spinless Salpeter equation with a time component
vector potential V(r) = ar - k/r.


title: Additional $J/\Psi$ Suppression from High Density Effects

abstract:
  At high energies the saturation effects associated to the high parton density
should modify the behavior of the observables in proton-nucleus and
nucleus-nucleus scattering. In this paper we investigate the saturation effects
in the nuclear $J/\Psi$ production and estimate the modifications in the energy
dependence of the cross section as well as in the length of the nuclear medium.
In particular, we calculate the ratio of $J/\Psi$ to Drell-Yan cross sections
and show that it is strongly modified if the high density effects are included.
Moreover, our results are compared with the data from the NA50 Collaboration
and predictions for the RHIC and LHC kinematic regions are presented. We
predict an additional $J/\Psi$ suppression associated to the high density
effects.


title: Di-photon production at the LHC

abstract:
  The standard model production of two photons is one of the most important
backgrounds to light Higgs boson production at the LHC. In this talk we discuss
the di-photon background, with emphasis on the effects of the recently
calculated next-to-leading-order (NLO) corrections to the gluon-gluon-initiated
component. We find that the $K$-factor for this component is smaller than that
for the analogous $gg\to H$ process, and that the correction to the total
irreducible di-photon production is modest. We also investigate ways to enhance
the statistical significance of the Higgs signal in the $\gamma\gamma$ channel.


title: Scalar field perturbations in fresh inflation

abstract:
  The model of fresh inflation with increasing cosmological parameter provides
sufficient e-folds to solve the flatness/horizon problem and the density
fluctuations agree with experimental values. In this model the temperature
increases during inflation and reach its maximum value when inflation ends
(where the number of e-folds is $N(t_e) \gg 60$). The most important
characteristic of this model is that provides a natural transition between the
end of inflation and the epoch when the universe is radiation dominated.


title: Expectation values of four-quark operators in the nucleon

abstract:
  We calculate expectation values of QCD operators consisting of the products
of the four operators of the light quarks corresponding to the scalar,
pseudoscalar, vector, pseudovector (axial) and tensor Lorentz structures in the
nucleon. All combinations of the light flavors are considered. For the
evaluation we use elements of the Perturbative Chiral Quark Model (PCQM),
approximating the contribution of the valence quarks by the contribution of the
PCQM constituent quarks. The contribution of the sea quarks is treated by
averaging over the QCD pions with the distribution of the pion field being
determined by the PCQM. For quarks with the same flavor the expectation values
are dominated by the contribution of the sea-quarks. In the scalar case the
contribution of the sea quarks is dominated by the "disconnected terms" were
one of the pairs of the quark operators acts on the vacuum while the other one
acts on the quarks of the pion. The role of the interference terms with one of
the quark pairs acting on the sea quarks and another one acting on the valence
quarks increases for quarks with different flavors. The result for the scalar
condensate is compared to the one obtained earlier in the framework of the
Nambu -Jona-Lasinio model.


title:
Dijets with 2,1 or 0 rapidity gap: Factorization breaking at the
  Tevatron

abstract:
  Central production cross-sections of hard dijets with 2,1 or 0 rapidity gap
at Tevatron are analyzed in terms of diffractive (``a la Good-Walker'') and non
diffractive fluctuations of the incident particles. The observed large
factorization breaking and the unexpected high value of the 2 to 1 gap
cross-section ratio are explained in terms of scattering with and between the
incident particles.


title: Unitarity effects in hard diffraction at HERA

abstract:
  We study how factorization breaking changes when going from diffractive deep
inelastic scattering to diffractive photoproduction of dijets. These processes
offer a sensitive probe of the interplay of soft and hard mechanisms in QCD. We
demonstrate that unitarity effects are already important in the gluon
distribution for x ~ 10^{-4}, for quite a wide range of Q^2.


title:
Measuring the Luminosity of a gamma gamma Collider with gamma gamma ->
  l+ l- gamma Events

abstract:
  The process gamma gamma -> l+ l- is highly suppressed when the total angular
momentum of the two colliding photons is zero so that it cannot be used for
luminosity determination. This configuration, however is needed for Higgs
production at a photon collider. It will be shown that the process gamma gamma
-> l+ l- gamma can be used in this case to measure the luminosity of a collider
with a precision that is good enough not to limit the error on the partial
decay width Gamma(H -> gamma gamma).


title: On Superplanckian Scattering on the Brane

abstract:
  The multidimensional space-time with $(D-4)$ compact extra space dimensions
and SM fields confined on four-dimensional brane is considered. The elastic
scattering amplitude of two particles interacting by gravitational forces is
calculated at superplanckian energies. A particular attention is paid to a
proper account of zero (massless) graviton mode. The renormalized Born pole is
reproduced in the eikonal amplitude which makes a leading contribution at small
momentum transfers. This singular part of the amplitude coincides with
well-known $D$-dimensional amplitude taken at $D \to 4$. The expression for a
contribution from massive graviton modes to the eikonal is derived, and it
asymptotics in the impact parameter are calculated. Our formula gives correct
four-dimensional result at $R_c \to 0$, where $R_c$ is the radius of the higher
dimensions, contrary to formulae obtained in recent papers on collisions of
particles living on the brane. The results are also compared with those
obtained previously for the scattering of the bulk fields in flat higher
dimensions.


title: The Odderon in Quantum Chromodynamics

abstract:
  The Odderon is the leading exchange in hadronic scattering processes at high
energies in which negative charge conjugation and parity quantum numbers are
transferred in the t-channel. We review the origin of the Odderon in Regge
theory, its status in perturbative and nonperturbative Quantum Chromodynamics,
as well as its phenomenology.


title:
Charge asymmetries in $\gamma\gamma \to \mu^+\mu^- + \nu_{\mu}
  \bar{\nu}_\mu$ / $\gamma \gamma \to W^\pm\mu^\mp +\nu_\mu$ with polarized
  photons

abstract:
  It is shown that the difference in the distributions of positive ($\mu^+$)
and negative charged leptons ($\mu^-$) in reactions $\gamma \gamma \to
\mu^+\mu^-+\nu\bar\nu$ and $\gamma \gamma \to W^\pm\mu^\mp +\nu(\bar\nu)$ at
$\sqrt{s}>200$ GeV leads to observable {\em charge asymmetry} of muons which is
sensitive to New Physics effects.


title: Resumming the color-octet contribution to e+ e- -> J/psi + X

abstract:
  Recent observations of the spectrum of J/psi produced in e+ e- collisions at
the Upsilon(4S) resonance are in conflict with fixed-order calculations using
the Non-Relativistic QCD (NRQCD) effective field theory. One problem is that
leading order color-octet mechanisms predict an enhancement of the cross
section for J/psi with maximal energy that is not observed in the data.
However, in this region of phase space large perturbative corrections (Sudakov
logarithms) as well as enhanced nonperturbative effects are important. In this
paper we use the newly developed Soft-Collinear Effective Theory (SCET) to
systematically include these effects. We find that these corrections
significantly broaden the color-octet contribution to the J/psi spectrum. Our
calculation employs a one-stage renormalization group evolution rather than the
two-stage evolution used in previous SCET calculations. We give a simple
argument for why the two methods yield identical results to lowest order in the
SCET power counting.


title: Gamma-ray bursts and the sociology of science

abstract:
  I discuss what we have learned about Gamma-Ray Bursts (GRBs) by studying
their `afterglows', and how these are interpreted in the generally-accepted
`fireball' model of GRBs, as well as in the generally-unaccepted `cannonball'
model of the same phenomena. The interpretation of GRBs is a good example
around which to frame a discussion of the different approaches to science found
in various fields, such as high-energy physics (HEP), high-energy astrophysics,
or even the deciphering of ancient languages. I use this example to draw
conclusions on `post-academic' science, and on the current status of European
HEP.


title: Energy levels and lifetimes of Nd IV, Pm IV, Sm IV, and Eu IV

abstract:
  To address the shortage of experimental data for electron spectra of
triply-ionized rare earth elements we have calculated energy levels and
lifetimes of 4f{n+1} and 4f{n}5d configurations of Nd IV (n=2), Pm IV (n=3), Sm
IV (n=4), and Eu IV (n=5) using Hartree-Fock and configuration interaction
methods. To control the accuracy of our calculations we also performed similar
calculations for Pr III, Nd III and Sm III, for which experimental data are
available. The results are important, in particular, for physics of magnetic
garnets.


title:
The process $e^{+}e^{-}\to\nu\bar{\nu}\gamma$ in topcolor-assisted
  technicolor models

abstract:
  In the context of topcolor-assisted technicolor (TC2) models, we consider the
process $e^{+}e^{-}\to \nu\bar{\nu}\gamma$ and calculate the cross section of
this process at leading order.It is shown that the extra U(1) gauge boson
$Z^{\prime}$ predicted by TC2 models can give significant contributions to the
process $e^{+}e^{-}\to \nu_{\tau}\bar{\nu}_{\tau}\gamma$, which may be detected
in the future high energy linear $e^{+}e^{-}$ collider(LC) experiments.


title: Effective Meson Field Theory from QCD

abstract:
  We give a simple and straightforward procedure of how to construct an
effective meson Lagrangian from QCD Lagrangian. We integrate the methods of
Gasser, Leutwyler, Alkofer and Reinhardt and use the derivative expansion
scheme to derive the low energy effective Lagrangian for meson fields to
$O(p^4)$. In this paper, why the meson particle can be treated as the goldstone
mode is very clear. In our calculation the result in $O(p^2)$ is the same as in
the chiral perturbation theory, but the result in $O(p^4)$ is different from
that in literature. We will discuss the discrepancies and give some remarks on
our result.


title: rSUGRA: Putting Nonuniversal Gaugino Masses on the (W)MAP

abstract:
  In this talk, we investigate the relic density and direct detection prospects
of rSUGRA, a simple paradigm for supersymmetry breaking that allows for
nonuniversal gaugino masses. We present updated plots reflecting the latest
cosmological measurements from WMAP.


title: Mass of the Neutrino and Its Axial-Vector Electromagnetic Nature

abstract:
  A neutrino possesses the anapole and electric dipole moments. Their
interaction with field of emission can also lead to the neutrino elastic
scattering by spinless nuclei. In this letter, we present some implications
implied from the process cross sections. One of them states that there exists a
hard connection between the neutrino magnetic and anapole moments. An equation
for the anapole and electric dipole form factors is also obtained. They define
the electronic neutrino axial-vector moments. All findings are generalized to
the case of a Majorana neutrino.


title:
Quark Schwinger-Dyson Evaluation of the l1, l2 Coefficients in the
  Chiral Lagrangian

abstract:
  Using a systematic expansion of the quark-antiquark Bethe-Salpeter
wavefunctions in the relativistic quark model and working to O(P^4), in the
chiral limit, we are able to derive theoretical expressions relating the
coefficients of the chiral lagrangian l1, l2 to the underlying quark-antiquark
wavefunctions and interaction kernels. This is accomplished by using a novel
technique based on a Ward Identity for the quark-antiquark ladder kernel which
greatly simplifies the required effort. Numerical evaluations are performed in
two simple specific models.


title:
A Possibility of large electro-weak penguin contribution in B -> K pi
  modes

abstract:
  We discuss about a possibility of large electro-weak penguin contribution in
B -> K pi from recent experimental data. The several relations among the
branching ratios which realize when the contributions from tree type and
electro-weak penguin are small compared with the gluon penguin and can be
treated as the expansion parameters do not satisfy the data. The difference
comes from the r^2 terms which is the square of the ratio with the gluon
penguin and the main contribution comes from electro-weak penguin. We find that
the contribution from electro-weak penguin may be large to explain the
experimental data. If the magnitude estimated from experiment is quite large
compared with the theoretical estimation, then it may be including some new
physics effects.


title: Lithium Experiment in the Interplay of Solar and Neutrino Physics

abstract:
  In a future study of solar neutrinos a special emphasis should be given to
the measurement of the fluxes of neutrinos generated in CNO cycle, because this
is a direct way to measure with record uncertainty - less than 1% the
contribution to the solar luminosity of a pp-chain of reactions. Combined with
the luminosity constraint method suggested by M. Spiro and D. Vignaud this will
put the foundation for the further substantial progress in the study of
neutrinos and thermonuclear reactions in the interior of the Sun. So far the
hypothesis of CNO cycle hasn't found any experimental confirmation. A
lithium-based radiochemical detector has a potential to detect neutrinos from
CNO cycle what will be a direct proof of its existence. This will be a
stringent test of the theory of stellar evolution and will complete a
long-standing goal of recording the neutrino spectrum of the Sun. The energy
generated in the Sun and neutrino oscillation parameters are inherently
interconnected in this research. The analysis shows that although a lithium
detector is a radiochemical one, principally it is possible to find separately
the fluxes of 13N- and 15O-neutrinos from the total neutrino capture rate
measured by this detector.


title: Structure of Proton

abstract:
  Electron--proton scattering in elastic and highly inelastic region is
reviewed in a unified approach. The importance of parity--violating scattering
due to electro--weak interference in probing the structure of proton is
emphasized. The importance of longitudnal spin--spin asymmetry as well as
parity violating longitudnal asymmetry to extract the structure functions of
proton in both regions are discussed. The recoil polarization of proton in the
elastic scattering is also discussed.


title: Strings In Baryons And Matrix Coordinates

abstract:
  It is argued that the internal dynamics of a baryon, as a bound state of
QCD-strings and quarks, may be captured by a theory of matrix coordinates.


title: A New String Model: NEXUS 3

abstract:
  After discussing conceptual problems with the conventional string model, we
present a new approach, based on a theoretically consistent multiple scattering
formalism.
  First results for proton-proton scattering at 158 GeV are discussed.


title: Strange Particles from NEXUS 3

abstract:
  After discussing conceptual problems with the conventional string model, we
present a new approach, based on a theoretically consistent multiple scattering
formalism. First results for strange particle production in proton-proton
scattering at 158 GeV and at 200 GeV (cms) are discussed.


title:
Quantum Electrodynamic Bound-State Calculations and Large-Order
  Perturbation Theory

abstract:
  The subjects which are discussed in this Thesis include: the self energy of a
bound electron and the spin-dependence of QED corrections in bound systems,
convergence acceleration techniques, and resummation methods for divergent
series with an emphasis on physical applications.


title: Cosmological Constraints on Neutrino Masses and Mixings

abstract:
  The bounds on neutrino masses and mixing that follows from the data on light
element abundances, large scale structure formation, and angular fluctuations
of cosmic microwave background radiation are analyzed. The role of neutrino
oscillations in BBN and the bounds on cosmological lepton asymmetry are
discussed.


title: Explaining the Ds(2317)

abstract:
  The recently observed Ds(2317) meson is explained as a scalar c+anti-s system
which appears as a bound state pole, below threshold, in the DK scattering
amplitude. The standard c+anti-s charmed scalar D_{s0} is found at about 2.9
GeV, with a width of some 150 MeV.
  For the scattering length of DK in S wave we predict 5+-1 1/GeV.


title: An anomalous dimension for small x evolution

abstract:
  We construct an anomalous dimension for small x evolution which goes beyond
standard fixed order perturbative evolution by including resummed small x
logarithms deduced from the leading order BFKL equation with running coupling.
Surprisingly, we find that once running coupling effects are properly taken
into account, the leading approximation is very close to standard perturbative
evolution in the range of x accessible at HERA, in overall agreement with the
data, with no need for phenomenological parameters to summarise subleading
effects. We also show that further corrections due to subleading small x
logarithms derived from the Fadin-Lipatov kernel can be kept under control, but
that they involve substantial resummation ambiguities which limit their
practical usefulness.


title:
Odd-intrinsic-parity processes within the Resonance Effective Theory of
  QCD

abstract:
  We analyse the most general odd-intrinsic-parity effective Lagrangian of QCD
valid for processes involving one pseudoscalar with vector mesons described in
terms of antisymmetric tensor fields. Substantial information on the
odd-intrinsic-parity couplings is obtained by constructing the
vector-vector-pseudoscalar Green's three-point function, at leading order in
1/Nc, and demanding that its short-distance behaviour matches the corresponding
OPE result. The QCD constraints thus enforced allow us to predict the decay
amplitude omega -> pion gamma, and the O(p^6) corrections to pion -> gamma
gamma. Noteworthy consequences concerning the vector meson dominance assumption
in the decay omega -> 3 pions are also extracted from the previous analysis.


title:
The Impact of Universal Extra Dimensions on B -> X_s gamma, B -> X_s
  gluon, B -> X_s mu^+ mu^-, K_L -> pi^0 e^ +e^-, and epsilon'/epsilon

abstract:
  We calculate the contributions of the Kaluza-Klein (KK) modes to the
gamma-penguins, gluon-penguins, gamma-magnetic penguins and chromomagnetic
penguins in the Appelquist, Cheng and Dobrescu (ACD) model with one universal
extra dimension. Together with our previous calculation of Z^0 penguin diagrams
(See http://arxiv.org/abs/hep-ph/0212143) this allows to study the impact of
the KK modes on the decays B -> X_s gamma, B -> X_s gluon, B -> X_s mu^+ mu^-
and K_L -> pi^0 e^+ e^- and on the CP-violating ratio epsilon'/epsilon. For the
compactification scale 1/R= 300 GeV the perturbative part of the branching
ratio for B -> X_s mu^+ mu^- is enhanced by 12 % while the zero in the A_FB
asymmetry is shifted from \hat s_0=0.162 to \hat s_0=0.142. The sizable
suppressions of Br(B -> X_s gamma) ~ 20 % and Br(B -> X_s gluon) ~ 40 % could
have interesting phenomenological implications on the lower bound on 1/R
provided the experimental and theoretical uncertainties will be decreased.
Similar comments apply to epsilon'/epsilon that is suppressed relative to the
Standard Model expectations with the size of the suppression depending
sensitively on the hadronic matrix elements. The impact on K_L -> pi^0 e^+ e^-
is below 10 %. We point out a correlation between the zero \hat s_0 in the A_FB
asymmetry and Br(B -> X_s gamma) that should be valid in most models with
minimal flavour violation.


title: The Radionactive Universe

abstract:
  In a large class of extra-dimensional models, a scalar degree of freedom
known as the radion is long-lived, or even stable, on cosmological scales. In
this paper we investigate the impact of radionactivity on the evolution of the
universe. We demonstrate that whether the radion overcloses the universe,
constitutes the dark matter, is the inflaton, the curvaton, or does not play
any role in cosmology, depends crucially on the ratio between the energy
densities stored in the radion and in the inflaton at the time of inflation. We
discuss the general difficulties reconciling models with low compactification
scale (i.e., TeV scale) with the simple picture of inflation.


title: Vector Boson Fusion and Quartic Boson Couplings

abstract:
  One of the goals of the upcoming experiments at the LHC is the exploration of
electroweak symmetry breaking in all aspects. In particular, the self-couplings
of the vector gauge bosons are completely specified in the Standard Model, as
are the couplings of the Higgs boson to the vector bosons once the Higgs mass
is known. The vector boson fusion mechanism is examined in order to measure the
process W + W -> Z + Z which has a favorable signal to noise ratio and which
has a major contribution from the quartic coupling WWZZ.


title: Scalar Dark Matter From Theory Space

abstract:
  The scalar dark matter candidate in a prototypical theory space little Higgs
model is investigated. We review all details of the model pertinent to dark
matter. We perform a thermal relic density calculation including couplings to
the gauge and Higgs sectors of the model. We find two regions of parameter
space that give acceptable dark matter abundances. The first region has a dark
matter candidate with a mass of order 100 GeV, the second region has a heavy
candidate with a mass greater than about 500 GeV$. The dark matter candidate in
either region is an admixture of an SU(2) triplet and an SU(2) singlet, thereby
constituting a WIMP (weakly interacting massive particle).


title: Quantum Chaos in the Yang-Mills-Higgs System at Finite Temperature

abstract:
  The quantum chaos in the finite-temperature Yang-Mills-Higgs system is
studied. The energy spectrum of a spatially homogeneous SU(2) Yang-Mills-Higgs
is calculated within thermofield dynamics. Level statistics of the spectra is
studied by plotting nearest-level spacing distribution histograms. It is found
that finite temperature effects lead to a strengthening of chaotic effects,
i.e. spectrum which has Poissonian distribution at zero temperature has
Gaussian distribution at finite-temperature.


title:
Three loop anomalous dimension of the second moment of the transversity
  operator in the MSbar and RI' schemes

abstract:
  We compute the anomalous dimension of the second moment of the transversity
operator, \bar{\psi} \sigma^{\mu\nu} D^\rho \psi, at three loops in both the
MSbar and RI' schemes. As a check on the result we also determine the O(1/N_f)
critical exponent of the n-th moment of the transversity operator in
d-dimensions in the large N_f expansion and determine leading order information
on the n dependence of the anomalous dimension at three and four loops in
MSbar. In addition the RI' anomalous dimension of the non-singlet twist-2
operator, \bar{\psi} \gamma^\mu D^\nu \psi, is also determined.


title: Dissipative dynamics in particle physics

abstract:
  The subject of this thesis is the study of dissipative dynamics and their
properties in particle physics, dealing with neutral B-mesons, neutron
interferometry and neutrino physics. Modified expressions for the relevant
phenomenological quantities characterizing these systems are obtained.
Moreover, the models presented in this work offer the possibility of direct
tests of some basic properties of reduced dynamics (in particular the notion of
complete positivity) since they represent concrete systems amenable to actual
experiments.


title:
Axial-vector Form Factors for $K_{\ell 2\gamma}$ and $\pi_{\ell
  2\gamma}$ at $O(p^6)$ in Chiral Perturbation Theory

abstract:
  We present two-loop calculations on the axial-vector form factors $F_A$ of
semileptonic radiative kaon and pion decays in chiral perturbation theory. The
relevant dimension-6 terms of the lagrangian are evaluated from the resonance
contribution and the results of the irreducible two-loop graphs of the sunset
topology are given in detail. We also explicitly show that the divergent parts
in $F_A$ are cancelled exactly as required.


title: Right-handed Electrons in Radiative Muon Decay

abstract:
  Electrons emitted in the radiative decay mu^- -> e^- anti-nu_e nu_mu gamma
have a significant probability of being right-handed, even in the limit m_e ->
0. Such ``wrong-helicity'' electrons, arising from helicity-flip
bremsstrahlung, contribute an amount alpha/(4 pi) Gamma_0 to the muon decay
width (Gamma_0 = G_F^2 m^5_mu/ (192 pi^3)). We use the helicity-flip splitting
function D_hf (z) of Falk and Sehgal (Phys. Lett. B 325, 509 (1994)) to obtain
the spectrum of the right-handed electrons and the photons that accompany them.
For a minimum photon energy E_gamma = 10 MeV (20 MeV), approximately 4% (7%) of
electrons in radiative mu-decay are right-handed.


title: Jet and Di-Jet production in Photon-Photon collisions

abstract:
  We present next-to-leading order QCD predictions for single-inclusive and
di-jet observables, relevant to the collisions of two on-shell photons,
obtained with a recently completed computation based upon the subtraction
method. We compare these predictions with available theoretical results, with
LEP data, and we discuss the various uncertainties which affect them.


title:
Probing Sub-Micron Forces by Interferometry of Bose-Einstein Condensed
  Atoms

abstract:
  We propose a technique, using interferometry of Bose-Einstein condensed
alkali atoms, for the detection of sub-micron-range forces. It may extend
present searches at 1 micron by 6 to 9 orders of magnitude, deep into the
theoretically interesting regime of 1000 times gravity. We give several
examples of both four-dimensional particles (moduli), as well as
higher-dimensional particles -- vectors and scalars in a large bulk-- that
could mediate forces accessible by this technique.


title: Unintegrated parton distributions and inclusive jet production at HERA

abstract:
  We describe how unintegrated parton distributions can be calculated from
conventional integrated distributions. We extend and improve the 'last-step'
evolution approach, and explain why doubly-unintegrated parton distributions
are necessary. We generalise k_t-factorisation to (z,k_t)-factorisation. We
apply the formalism to inclusive jet production in deep-inelastic scattering,
mainly at leading-order, but we also study the extension to next-to-leading
order. We compare the predictions with recent HERA data.


title:
Lepton flavour violation in e^{\pm}e^{-}\to \ell^{\pm}e^{-} (\ell =
  \mu,\tau) induced by R-conserving supersymmetry

abstract:
  The lepton flavour violating signals $e^{+}e^{-}\to \ell^{+}e^{-}$ and
$e^{-}e^{-}\to \ell^{-}e^- (\ell=\mu,\tau)$ are studied in the context of low
energy R-parity conserving supersymmetry at center of mass energies of interest
for the next generation of linear colliders. Loop level amplitudes receive
contributions from electroweak penguin and box diagrams involving sleptons and
gauginos. Lepton flavour violation is due to off diagonal elements in $SU(2)_L$
doublet slepton mass matrix. These masses are treated as model independent free
phenomenological parameters in order to discover regions in parameter space
where the signal cross section may be observable. The results are compared with
(a) the experimental bounds from the non-observation of rare radiative lepton
decays $\mu, \tau \to e\gamma$ and (b) the general mSUGRA theoretical scenario
with seesaw mechanism where off diagonal slepton matrix entries are generated
by renormalization group evolution of neutrino Yukawa couplings induced by the
presence of new energy scales set by the heavy $SU(2)_L$ singlet neutrino
masses. It is found that in $e^- e^-$ collisions the ($e\tau$) signal can be
observable with a total integrated luminosity of 100 fb$^{-1}$ and the that the
background can be easily suppressed. In $e^+ e^-$ collisions the cross section
is smaller and higher luminosities are needed. The experimental bound on the
decay $\mu \to e \gamma$ prevents the ($e\mu$) signal from being observable.


title: Can the CKM phase be the only source of CP violation?

abstract:
  We address the question of whether the CP violating phase in the CKM mixing
matrix can be the only source of all CP violation. We show that in
supersymmetric models with new flavour structure beyond the Yukawa matrices,
the CKM phase can generate the required baryon asymmetry and also accounts for
all observed results in K and B systems, in particular $\epsilon'/\epsilon$ and
the CP asymmetry of $B \to \phi K_S$.


title:
Summary of the YITP-RCNP Workshop on Chiral Restoration in Nuclear
  Medium

abstract:
  This is a personal summary of the workshop. I overview the topics of the
workshop and itemize what we learned at the workshop.


title: Baryon-Baryon Interaction in the Quark Cluster Model

abstract:
  The quark cluster model approach to the baryon-baryon interaction is reviewed
and recent application to the charge symmetry breaking in nuclear force is
discussed.


title: The Lund Model at Nonzero Impact Parameter

abstract:
  We extend the formulation of the longitudinal 1+1 dimensional Lund model to
nonzero impact parameter using the minimal area assumption. Complete formulae
for the string breaking probability and the momenta of the produced mesons are
derived using the string worldsheet Minkowskian helicoid geometry. For strings
stretched into the transverse dimension, we find probability distribution with
slope linear in m_T similar to the statistical models but without any
thermalization assumptions.


title: Final state interactions in nonleptonic hyperon decays

abstract:
  We investigate the importance of final state interactions in weak nonleptonic
hyperon decays within a relativistic chiral unitary approach based on coupled
channels. The effective potentials for meson-baryon scattering are derived from
a chiral effective Lagrangian and iterated in a Bethe-Salpeter equation, which
generates the low lying baryon resonances dynamically. The inclusion of final
state interactions decreases the discrepancy between theory and experiment for
both s and p waves. Our study indicates that contributions from higher order
terms of the weak effective Lagrangian may play an important role in these
decays.


title:
Quarkonium polarization in heavy ion collisions as a possible signature
  of the quark--gluon plasma

abstract:
  The polarization of quarkonium states produced in hadron collisions exhibits
strong non-perturbative effects - for example, at small transverse momentum
$p_t$ charmonia appear unpolarized, in sharp contradiction to the predictions
of perturbation theory. The quark--gluon plasma is expected to screen away the
non-perturbative physics; therefore those quarkonia which escape from the
plasma should possess polarization as predicted by perturbative QCD. We
estimate the expected $J/\psi$ polarization at small $p_t$, and find that it
translates into the asymmetry of the $e^+e^- (\mu^+\mu^-)$ angular distribution
$W(\theta) \sim 1 + \alpha cos^2\theta$, with $\alpha \simeq 0.35 \div 0.4$.


title:
The decays omega(782), phi(1020) to 5 pi in the hidden local symmetry
  approach

abstract:
  The decays omega -> 2pi^+ 2pi^- pi^0 and omega -> pi^+ pi^- 3pi^0 are
reconsidered in the hidden local symmetry approach (HLS) added with the
anomalous terms. The decay amplitudes are analyzed in detail, paying the
special attention to the Adler condition of vanishing the whole amplitude at
vanishing momentum of any final pion. Combining the Okubo-Zweig-Iizuka (OZI)
rule applied to the five pion final state, with the Adler condition, we
calculate also the phi -> 2pi^+ 2pi^-pi^0 and phi -> pi^+ pi^- 3pi^0 decay
amplitudes. The partial widths of the above decays are evaluated, and the
excitation curves in e^+e^- annihilation are obtained, assuming reasonable
particular relations among the parameters characterizing the anomalous terms of
the HLS Lagrangian. The evaluated branching ratios B(phi -> pi^+ pi^-
3pi^0)~2x10^{-7} and B(phi -> 2pi^+ 2pi^- pi^0)~7x10^{-7} are such that with
the luminosity L=500 pb^{-1} attained at DAFNE phi factory, one may already
possess about 1685 events of the decays phi -> 5pi.


title: Charm production asymmetries from heavy-quark recombination

abstract:
  Charm asymmetries in fixed-target hadroproduction experiments are sensitive
to power corrections to the QCD factorization theorem for heavy quark
production. A power correction called heavy-quark recombination has recently
been proposed to explain these asymmetries. In heavy-quark recombination, a
light quark or antiquark participates in a hard scattering which produces a
charm-anticharm quark pair. The light quark or antiquark emerges from the
scattering with small momentum in the rest frame of the charm quark, and
together they hadronize into a charm particle. The cross section for this
process can be calculated within perturbative QCD up to an overall
normalization. Heavy-quark recombination explains the observed D meson and
\Lambda_c asymmetries with a minimal set of universal nonperturbative
parameters.


title: Motion of Colored Particle in a Chromomagnetic Field

abstract:
  The Dirac equation in a chromomagnetic field is solved for colored particle
moving in a limited space volume. Quantized energy levels and the corresponding
wave functions are found for backgrounds both directed along third axes and
having spherical symmetry. It was shown interrelation with the case of motion
in an infinite space volume.


title: Leptogenesis with four gauge singlets

abstract:
  We consider a generic type of leptogenesis model which can successfully
produce the correct value of the observed baryon number to entropy ratio. The
main feature of this model is that it is a simple TeV scale model, a scale
accessible in near future machines, with a minimal particle content. Both
supersymmetric and non-supersymmetric versions of the model are feasible. This
model also gives left-handed neutrino masses compatible with all current data
from direct and indirect neutrino experiments.


title:
Physics Impact of a Precise Determination of the Top Quark Mass at an
  e+e- Linear Collider

abstract:
  At a prospective e+e- Linear Collider (LC) a very precise determination of
the top quark mass with an accuracy of $\delta m_t <= 100 MeV$ will be
possible. This is to be compared with the envisaged accuracy of $\delta m_t =
1-2 GeV$ at the Tevatron and the LHC. We discuss the physics impact of such a
precise determination of m_t, focusing on the Standard Model (SM) and its
minimal supersymmetric extension (MSSM). In particular, we show the importance
of a precise knowledge of m_t for electroweak precision observables, and for
Higgs physics and the scalar top sector of the MSSM. Taking the mSUGRA model as
a specific example, we furthermore demonstrate the importance of a precise m_t
value for the prediction of sparticle masses and for constraints on the
parameter space allowed by the relic density. The uncertainty in m_t also
significantly affects the reconstruction of the supersymmetric high scale
theory. We find that going from hadron collider to LC accuracy in m_t leads to
an improvement of the investigated quantities by up to an order of magnitude.


title: Helicity Formalism for Spin-2 Particles

abstract:
  We develop the helicity formalism for spin-2 particles and apply it to the
case of gravity in flat extra dimensions. We then implement the large extra
dimensions scenario of Arkani-Hamed, Dimopoulos and Dvali in the program
AMEGIC++, allowing for an easy calculation of arbitrary processes involving the
emission or exchange of gravitons. We complete the set of Feynman rules derived
by Han, Lykken and Zhang, and perform several consistency checks of our
implementation.


title: Can there be a heavy sbottom hidden in three-jet data at LEP?

abstract:
  A low-energy supersymmetry scenario with a light gluino of mass 12 - 16 GeV
and light sbottom (b1) of mass 2 - 6 GeV has been used to explain the apparent
overproduction of b quarks at the Tevatron. In this scenario the other mass
eigenstate of the sbottom, i.e. b2, is favored to be lighter than 180 GeV due
to constraints from electroweak precision data. We survey its decay modes in
this scenario and show that decay into a b quark and gluino should be dominant.
Associated sbottom production at LEP via e+ e- -> Z* -> b1 b2* + b1* b2 is
studied and we show that it is naturally a three-jet process with a small
cross-section, increasingly obscured by a large Standard Model background for
heavier b2. However we find that direct observation of a b2 at the 5-sigma
level is possible if it is lighter than 110 - 129 GeV, depending on the sbottom
mixing angle |cos(theta_b)| = 0.30 - 0.45. We also show that b2-pair production
can be mistaken for production of neutral MSSM Higgs bosons in the channel e+
e- -> h^0 A^0 -> b b-bar b b-bar. Using searches for the latter we place a
lower mass limit of 90 GeV on b2.


title: The little flavons

abstract:
  Fermion masses and mixing matrices can be described in terms of spontaneously
broken (global or gauge) flavor symmetries. We propose a little-Higgs inspired
scenario in which an SU(2)xU(1) gauge flavor symmetry is spontaneously (and
completely) broken by the vacuum of the dynamically induced potential for two
scalar doublets (the flavons) which are pseudo-Goldstone bosons remaining after
the spontaneous breaking--at a scale between 10 and 100 TeV--of an approximate
SU(6) global symmetry. The vacuum expectation values of the flavons give rise
to the texture in the fermion mass matrices. We discuss in detail the case of
leptons. Light-neutrino masses arise by means of a see-saw-like mechanism that
takes place at the same scale at which the SU(6) global symmetry is broken. We
show that without any fine tuning of the parameters the experimental values of
the charged-lepton masses,the neutrino square mass differences and the
Pontecorvo-Maki-Nakagawa-Sakata mixing matrix are reproduced.


title: Threshold behavior of scattering poles

abstract:
  The results of a model for meson-meson scattering are studied. The model is
shown to be capable of on the one hand reproducing the scattering data, while
on the other hand a quark-antiquark confinement spectrum can be determined.
  It is concluded that adopting the model's formulation of the transition
matrix elements for data analysis, it may serve as a link between experiment
and quenched lattice calculations.


title: String Inspired Neutrino Mass Textures in Light of KamLAND and WMAP

abstract:
  Recent data from astrophysical and terrestrial experiments indicates large
mixing angles in the neutral lepton sector and restricts the allowed regions of
neutrino masses. In particular, the large mixing angles in the lepton sector
are disparate from the small mixing in the quark sector. This disparity is
unnatural from the point of view of grand unified theories, that are well
motivated by the Standard Model multiplet structure and logarithmic running of
its parameters. we examine the issue of this disparity from the perspective of
string derived SO(10) GUT models, in which the SO(10) symmetry is broken
directly at the string theory level. A characteristic feature of such models is
the appearance of numerous SO(10) singlet fields. We propose that the mismatch
between the quark and lepton mixing parameters arises due to this extended
singlet spectrum and its mixing with the right-handed neutrinos. We discuss a
string inspired effective parameterization of the extended neutrino mass matrix
and demonstrates that the coupling with the SO(10) singlet spectrum can readily
account for the neutrino flavor parameters. The mechanism implies that some
SO(10) singlet fields should exist at intermediate mass scales. We study the
possibilty of deriving the neutrino mass spectrum from string theory in a
specific string derived vacuum solution, and comment on the properties that
such a solution should possess.


title: QCD Inequalities and the $D_s(2320)$

abstract:
  We discuss the new state $D_{sJ}(2317)$ discovered by BaBar and demonstrate
using QCD inequalities that if indeed the $f_0(980)$ and the new $D_{sJ}(2317)$
($0^+$) are primarilly made of four quarks that a new I=0 ``$\bar DD$ bound
state'' at a mass smaller than 3660 MeV must exist. Observation of such a state
will constitute definitive evidence for four-quark states.


title: Decay of axial-vector mesons into VP and P$\gamma$

abstract:
  We propose a phenomenological Lagrangian for the decay of the SU(3) nonets of
the axial-vector mesons of $J^{PC}=1^{+-},1^{++}$ into a vector meson and a
pseudoscalar constructed with tensor fields for the vector and axial-vector
mesons. The formulation leads to a good reproduction of the different decay
branching ratios and assuming vector meson dominance (VMD) it also leads to
good results for the radiative decay of the $a_1$ into pion and photon, and in
agreement with the structure proposed in the chiral tensor formulation of
radiative decay of axial-vector mesons. The two SU(3) parameters and the mixing
angle of $K_{1A}$ and $K_{1B}$ needed to give the physical $K_1(1270)$ and
$K_1(1400)$ resonances are also determined.


title: Cosmic Black Holes

abstract:
  Production of high-energy gravitational objects is a common feature of
gravitational theories. The primordial universe is a natural setting for the
creation of black holes and other nonperturbative gravitational entities.
Cosmic black holes can be used to probe physical properties of the very early
universe which would usually require the knowledge of the theory of quantum
gravity. They may be the only tool to explore thermalisation of the early
universe. Whereas the creation of cosmic black holes was active in the past, it
seems to be negligible at the present epoch.


title: Probing Lorentz and CPT violation with space-based experiments

abstract:
  Space-based experiments offer sensitivity to numerous unmeasured effects
involving Lorentz and CPT violation. We provide a classification of clock
sensitivities and present explicit expressions for time variations arising in
such experiments from nonzero coefficients in the Lorentz- and CPT-violating
Standard-Model Extension.


title:
Multidimensional cosmological models: cosmological and astrophysical
  implications and constraints

abstract:
  We investigate four-dimensional effective theories which are obtained by
dimensional reduction of multidimensional cosmological models with factorizable
geometry and consider the interaction between conformal excitations of the
internal space (geometrical moduli excitations) and Abelian gauge fields. It is
assumed that the internal space background can be stabilized by minima of an
effective potential. The conformal excitations over such a background have the
form of massive scalar fields (gravitational excitons) propagating in the
external spacetime. We discuss cosmological and astrophysical implications of
the interaction between gravexcitons and four-dimensional photons as well as
constraints arising on multidimensional models of the type considered in our
paper. In particular, we show that due to the experimental bounds on the
variation of the fine structure constant, gravexcitons should decay before
nucleosynthesis starts. For a successful nucleosynthesis the masses of the
decaying gravexcitons should be m>10^4 GeV. Furthermore, we discuss the
possible contribution of gravexcitons to UHECR. It is shown that, at energies
of about 10^{20}eV, the decay length of gravexcitons with masses m>10^4 GeV is
very small, but that for m <10^2 GeV it becomes much larger than the
Greisen-Zatsepin-Kuzmin cut-off distance. Finally, we investigate the
possibility for gravexciton-photon oscillations in strong magnetic fields of
astrophysical objects. The corresponding estimates indicate that even the high
magnetic field strengths of magnetars are not sufficient for an efficient and
copious production of gravexcitons.


title: Dilepton rapidity distribution in the Drell-Yan process at NNLO in QCD

abstract:
  We compute the rapidity distribution of the virtual photon produced in the
Drell-Yan process through next-to-next-to-leading order in perturbative QCD. We
introduce a powerful new method for calculating differential distributions in
hard scattering processes. This method is based upon a generalization of the
optical theorem; it allows the integration-by-parts technology developed for
multi-loop diagrams to be applied to non-inclusive phase-space integrals, and
permits a high degree of automation. We apply our results to the analysis of
fixed target experiments.


title: Flavor Constraints on Split Fermion Models

abstract:
  We examine the contributions to rare processes that arise in models where the
Standard Model fermions are localized at distinct points in compact extra
dimensions. Tree-level flavor changing neutral current interactions for the
Kaluza-Klein (KK) gauge field excitations are induced in such models, and hence
strong constraints are thought to exist on the size of the additional
dimensions. We find a general parameterization of the model which does not
depend on any specific fermion geography and show that typical values of the
parameters can reproduce the fermion hierarchy pattern. Using this
parameterization, we reexamine the contributions to neutral meson mixing, rare
meson decays, and single top-quark production in $e^+e^-$ collisions. We find
that is it possible to evade the stringent bounds for natural regions of the
parameters, while retaining finite separations between the fermion fields and
without introducing a new hierarchy. The resulting limits on the size of the
compact dimension can be as low as TeV$^{-1}$.


title:
The Proton Electromagnetic Form Factor $F_2$ and Quark Orbital Angular
  Momentum

abstract:
  We analyze the proton electromagnetic form factor ratio
$R(Q^{2})=QF_2(Q^{2})/F_1(Q^{2})$ as a function of momentum transfer $Q^{2}$
within perturbative QCD. We find that the prediction for $R(Q^{2})$ at large
momentum transfer $Q$ depends on the exclusive quark wave functions, which are
unknown. For a wide range of wave functions we find that $ QF_2/F_1 \sim\
const$ at large momentum transfer, in agreement with recent JLAB data.


title:
Charged Lepton Flavor Violating Decays: Leading Logarithmic
  Approximation versus Full RG Results

abstract:
  In the context of the minimal supersymmetric extension of the Standard Model
with the right-handed Majorana neutrinos, we study lepton flavor violating
processes including full renormalization group running effects. We
systematically compare our results with the commonly used leading logarithmic
approximation, resorting to a ``best fit'' approach to fix all the high energy
Yukawa matrices. We find significant deviations in large regions of the SUSY
parameter space, which we outline in detail. We also give, within this setting,
some results on the cosmo-phenomenologically preferred stau coannihilation
region. Finally, we propose a parametrization, in terms of the SUSY input
parameters, of the common SUSY mass appearing in the leading log and mass
insertion approximation formula for the charged lepton flavor violating decay
rates, which fits our full renormalization group results with high precision.


title:
Mesons of the $f_0$-family in the processes
  $\pi\pi\to\pi\pi,K\bar{K},\eta\eta$ up to 1.9 GeV

abstract:
  In combined 2- and 3-channel analyses of experimental data on the coupled
processes $\pi\pi\to\pi\pi,K\bar{K},\eta\eta$ in the channel with
$I^GJ^{PC}=0^+0^{++}$, various scenarios of these reactions(with different
numbers of resonances) are considered. In a model-independent approach,
confirmation of the $\sigma$-meson below 1 GeV and definite indications of the
QCD nature of other $f_0$ resonances are obtained. The conclusion on the linear
realization of chiral symmetry is drawn.


title: Chaotization of the periodically driven quarkonia

abstract:
  Classical regular and chaotic dynamics of the particle bound in the Coulomb
plus linear potential under the influence of time-periodical perturbations is
treated using resonace analysis. Critical value of the external field at which
chaotization will occur is evaluated analytically based on the Chirikov
criterion of stochasticity.


title:
Measurement of quantum states of neutrons in the Earth's gravitational
  field

abstract:
  The lowest stationary quantum state of neutrons in the Earth's gravitational
field is identified in the measurement of neutron transmission between a
horizontal mirror on the bottom and an absorber on top. Such an assembly is not
transparent for neutrons if the absorber height is smaller than the "height" of
the lowest quantum state.


title: Roper Resonance and S_{11}(1535) from Lattice QCD

abstract:
  Using the constrained curve fitting method and overlap fermions with the
lowest pion mass at $180 {\rm MeV}$, we observe that the masses of the first
positive and negative parity excited states of the nucleon tend to cross over
as the quark masses are taken to the chiral limit. Both results at the physical
pion mass agree with the experimental values of the Roper resonance
($N^{1/2+}(1440)$) and $S_{11}$ ($N^{1/2-}(1535)$). This is seen for the first
time in a lattice QCD calculation. These results are obtained on a quenched
Iwasaki $16^3 \times 28$ lattice with $a = 0.2 {\rm fm}$. We also extract the
ghost $\eta' N$ states (a quenched artifact) which are shown to decouple from
the nucleon interpolation field above $m_{\pi} \sim 300 {\rm MeV}$. From the
quark mass dependence of these states in the chiral region, we conclude that
spontaneously broken chiral symmetry dictates the dynamics of light quarks in
the nucleon.


title: Cosmology at the Turn of Centuries

abstract:
  A brief review of the present-day development of cosmology is presented for
mixed physical audience. The universe history is briefly described. Unsolved
problems are discussed, in particular, the mystery of the cosmological constant
and dark energy, the problems of dark matter, and baryogenesis. A brief
discussion of the cosmological role of neutrinos is also given.


title:
CPT symmetry and properties of the exact and approximate effective
  Hamiltonians for the neutral kaon complex

abstract:
  We start from a discussion of the general form and general CP-- and CPT--
transformation properties of the Lee--Oehme--Yang (LOY) effective Hamiltonian
for the neutral kaon complex. Next we show that there exists an approximation
which is more accurate than the LOY, and which leads to an effective
Hamiltonian whose diagonal matrix elements posses CPT transformation
properties, which differ from those of the LOY effective Hamiltonian. These
properties of the mentioned effective Hamiltonians are compared with the
properties of the exact effective Hamiltonian for the neutral kaon complex. We
show that the diagonal matrix elements of the exact effective Hamiltonian
governing the time evolution in the subspace of states of an unstable particle
and its antiparticle need not be equal at for $t > t_{0}$ ($t_{0}$ is the
instant of creation of the pair) when the total system under consideration is
CPT invariant but CP noninvariant. The unusual consequence of this result is
that, contrary to the properties of stable particles, the masses of the
unstable particle "1" and its antiparticle "2" need not be equal for $t \gg
t_{0}$ in the case of preserved CPT and violated CP symmetries.


title: Effective 't Hooft-Polyakov monopoles from pure SU(3) gauge theory

abstract:
  The well known topological monopoles originally investigated by 't Hooft and
Polyakov are known to arise in classical Yang-Mills-Higgs theory. With a pure
gauge theory it is known that the classical Yang-Mills field equation do not
have such finite energy configurations. Here we argue that such configurations
may arise in a semi-quantized Yang-Mills theory, where the original gauge
group, SU(3), is reduced to a smaller gauge group, SU(2), and with some
combination of the coset fields of the SU(3) to SU(2) reduction acting as
effective scalar fields. The procedure is called semi-quantized since some of
the original gauge fields are treated as quantum degrees of freedom, while
others are postulated to be effectively described as classical degrees of
freedom. Some speculation is offer on a possible connection between these
monopole configurations and the confinement problem, and the nucleon spin
puzzle.


title:
Flux tube dressed with color electric $E^a_{\rho,\phi}$ and magnetic
  $H^a_{\rho,\phi}$ fields

abstract:
  The Nielsen - Olesen flux tube in the SU(2) Yang - Mills - Higgs theory
dressed with the color electric $E^a_{\rho,\phi}$ and magnetic
$H^a_{\rho,\phi}$ fields is derived. On the next step it is argued that this
flux tube can be considered as a result of the nonperturbatuve analytical
calculations in the SU(3) quantum theory.


title: New Predictions for Multiquark Hadron Masses

abstract:
  The recent reported charmed-strange resonance at 2.32 GeV/c suggests a
possible multiquark state. Three types of multiquark bound states are reviewed.
A previous model-independent variational approach considers a tetraquark with
two heavy antiquarks and two light quarks as a heavy antidiquark with the color
field of a quark bound to the two light quarks with a wave function like that
of a heavy baryon. Results indicate that a charmed-strange tetraquark $\bar c
\bar s u d$ or a bottom-strange tetraquark $\bar b \bar s u d$ with this
"diquark-heavy-baryion" wave function is not bound, in contrast to
"molecular-type" $D-K$ and $B-K$ wave functions. However, a charmed-bottom
tetraquark $\bar c \bar b u d$ might be bound with a very narrow weak decay
mode. A "molecular-type" $D-B$ state can have an interesting $B_c \pi$ decay
with a high energy pion,


title:
A comment on: `Some problems with calculating the quantum corrections to
  the classical 't Hooft-Polyakov monopole'

abstract:
  In a recent publication we noticed that the Hamiltonian density for
fluctuations around the 't Hooft-Polyakov monopole appeared to be
non-Hermitian. Here we show that when this Hamiltonian density is integrated
into the Hamiltonian all non-Hermitian terms give a vanishing total
contribution.


title:
Bottom-tau Yukawa non-unification in supersymmetric SU(5) with an
  Abelian flavor symmetry

abstract:
  We present a supersymmetric SU(5) x U(1)_H model, free from gauge anomalies,
where the Abelian factor U(1)_H, introduced to account for the hierarchy of
fermion masses and mixings, is broken by the same adjoint representations of
SU(5) that also break the GUT symmetry. The model predicts approximate, but
never exact, bottom-tau Yukawa unification. The deviations are related to group
theoretical coefficients and can naturally be at the level of 10%-20%.


title: Excited heavy baryon masses to order Lambda_{QCD}/m_Q from QCD sum rules

abstract:
  Masses of the p-wave excited heavy baryons have been calculated to the
Lambda_{QCD}/m_Q order using QCD sum rule method within the framework of heavy
quark effective theory. Numerical results for kinetic energy lambda_1 and
chromo-magnetic interaction lambda_2 are presented. The splitting between spin
1/2 and 3/2 doublet derived from our calculation is given, for which the
agreement with the current experiment is desirable.


title:
Thermodynamics at Non-Zero Baryon Number Density: A Comparison of
  Lattice and Hadron Resonance Gas Model Calculations

abstract:
  We compare recent lattice studies of QCD thermodynamics at non-zero quark
chemical potential with the thermodynamics of a hadron resonance gas. We argue
that for T < Tc the equation of state derived from Monte--Carlo simulations of
two flavour QCD at non-zero chemical potential can be well described by a
hadron resonance gas when using the same set of approximations as used in
current lattice calculations. We estimate the importance of truncation errors
arising from the use of a Taylor expansion in terms of the quark chemical
potential and examine the influence of unphysically large quark masses on the
equation of state and the critical conditions for deconfinement.


title: Local equilibrium of the quark-gluon plasma

abstract:
  Within kinetic theory, we look for local equilibrium configurations of the
quark-gluon plasma by maximizing the local entropy. We use the well-established
transport equations in the Vlasov limit, supplemented with the Waldmann-Snider
collision terms. Two different classes of local equilibrium solutions are
found. The first one corresponds to the configurations that comply with the
so-called collisional invariants. The second one is given by the distribution
functions that cancel the collision terms, representing the most probable
binary interactions with soft gluon exchange in the t-channel. The two sets of
solutions agree with each other if we go beyond these dominant processes and
take into account subleading quark-antiquark annihilation/creation and gluon
number non-conserving processes. The local equilibrium state appears to be
colorful, as the color charges are not locally neutralized. Properties of such
an equilibrium state are analyzed. In particular, the related hydrodynamic
equations of a colorful fluid are derived. Possible neutralization processes
are also briefly discussed.


title:
New Interpretation on the Solar Neutrino Flux with Flavor Mixing and
  Majorana Magnetic Moment

abstract:
  A simple and model-independent method is proposed to extract information on
solar $\nu_e$ transition into antineutrinos via the spin flavor precession
(SFP) from the measurements of solar neutrino flux at SNO and Super-Kamiokande.
Incorporating the KamLAND experimental results, we examine how large the
suppression of the solar neutrino flux could be due to the SFP mechanism in the
context of the hybrid scenario with two-flavor neutrino and antineutrino
mixings.


title: Soft-gluon resummation for Higgs boson production at hadron colliders

abstract:
  We consider QCD corrections to Higgs boson production through gluon--gluon
fusion in hadron collisions. We compute the cross section, performing the
all-order resummation of multiple soft-gluon emission at
next-to-next-to-leading logarithmic level. Known fixed-order results (up to
next-to-next-to-leading order) are consistently included in our calculation. We
give phenomenological predictions for Higgs boson production at the Tevatron
and at the LHC. We estimate the residual theoretical uncertainty from
perturbative QCD contributions. We also quantify the differences obtained by
using the presently available sets of parton distributions.


title: Charm Cross Sections for the Tevatron Run II

abstract:
  We present a calculation of the D^{*+}, D^+ and D^0 meson single inclusive
production cross section for the Tevatron Run II. We use the FONLL approach in
perturbative QCD, which, besides including the known next-to-leading order
corrections, also provides for the resummation at the next-to-leading
logarithmic level of terms enhanced at large p_T by powers of log(p_T/m), where
m is the charm mass and p_T is its transverse momentum. Non-perturbative
effects in charm hadronization are extracted, in moment space, from recent
ALEPH data for D^* fragmentation in e^+e^- collisions.


title: Chiral Symmetry in an Extended Constituent Quark Potential Model

abstract:
  The chiral symmetry is applied to an extended constituent quark potential
model. With random phase approximation (RPA), the model comprises sea quark
excitations. To obtain the pseudoscalar $\pi$ meson as a Goldstone boson, the
quark effective potentials are modified in the model to account for the
dynamical breaking of chiral symmetry. Also the vector $\rho$ meson is
calculated and the KSRF relation about $\pi$ and $\rho$ meson decay constants
is derived in the model.


title: Quantum chaos in the heavy quarkonia

abstract:
  The binding energy spectra of the heavy quarkonia are calculated by solving
the Schr\"odinger equations with Coulomb plus confining potentials. Statistical
properties of the obtained spectra are studied by plotting nearest level
spacing distribution histograms.


title: Harmonic quarks and their precise masses

abstract:
  An examination of charged two-quark meson masses hinted that the mass ratio
of neighboring quarks could simply be a constant. The concept of a harmonic
quark oscillator based on a quark-antiquark pair is introduced. Unstable
symmetric state of the harmonic quark oscillator can be broken to an asymmetric
state with the formation the neighboring quark of lesser mass due to a weak
reaction. A new recurrent equation of quark masses is obtained and the model of
harmonic quark family is developed. The quark masses in the model are bound
together into one rigid chain. With the electromagnetic contribution taken into
account the quark masses are calculated with the 0.03 percent inaccuracy. It
follows from the model that the muon is a single u-quark mass state fixed as a
lepton. The neutral pion is probably a stable harmonic oscillator based on a
quark-antiquark u-pair.


title:
Pseudoscalar mesons and their radial excitations from the Effective
  Chiral Lagrangian

abstract:
  Effective Chiral Lagrangian is derived from QCD in the framework of Field
Correlator Method. It contains the effects of both confinement and chiral
symmetry breaking due to a special structure of the resulting quark mass
operator. It is shown that this Lagrangian describes light pseudoscalar mesons,
and Gell-Mann-Oakes-Renner relations for pions, eta and K mesons are
reproduced. Spectrum of radial excitations of pions and K mesons is found and
compared to experimentally known masses.


title: epsilon'/epsilon at the NLO: 10 Years Later

abstract:
  During the last four years several parameters relevant for the analysis of
the CP-violating ratio epsilon'/epsilon improved and/or changed significantly.
In particular, the experimental value of epsilon'/epsilon and the strange quark
mass decreased, the uncertainty in the CKM factor has been reduced, and for a
value of the hadronic matrix element of the dominant electroweak penguin
operator Q_8, some consensus has been reached among several theory groups. In
view of this situation, ten years after the first analyses of epsilon'/epsilon
at the next-to-leading order, we reconsider the analysis of epsilon'/epsilon
within the SM and investigate what can be said about the hadronic Q_6 matrix
element of the dominant QCD penguin operator on the basis of the present
experimental value of epsilon'/epsilon and todays values of all other
parameters.
  Employing a conservative range for the reduced electroweak penguin matrix
element R_8=1.0+-0.2 from lattice QCD, and present values for all other input
parameters, on the basis of the current world average for epsilon'/epsilon, we
obtain the reduced hadronic matrix element of the dominant QCD penguin operator
R_6=1.23+-0.16 implying <Q_6>_0^NDR(m_c) ~ -0.8 <Q_8>_2^NDR(m_c). We compare
these results with those obtained in large-N_c approaches in which generally
R_6 ~ R_8 and <Q_6>_0^NDR(m_c) is chirally suppressed relatively to
<Q_8>_2^NDR(m_c). We present the correlation between R_6 and R_8 that is
implied by the data on epsilon'/epsilon provided new physics contributions to
epsilon'/epsilon can be neglected.


title: Different G_F and sin^2(theta_W) for different processes

abstract:
  A natural theoretical framework is presented which allows for small
departures from quark-lepton universality such that different G_F and
sin^2(theta_W) values are applicable for different processes. In particular,
the inequality (G_F)^{NC}_{lq} < (G_F)^{CC}_{lq} < (G_F)^{CC}_{ll} <
(G_F)^{NC}_{ll} holds. New physics is predicted at the TeV scale.


title: Updated Post-WMAP Benchmarks for Supersymmetry

abstract:
  We update a previously-proposed set of supersymmetric benchmark scenarios,
taking into account the precise constraints on the cold dark matter density
obtained by combining WMAP and other cosmological data, as well as the LEP and
b -> s gamma constraints. We assume that R parity is conserved and work within
the constrained MSSM (CMSSM) with universal soft supersymmetry-breaking scalar
and gaugino masses m_0 and m_1/2. In most cases, the relic density calculated
for the previous benchmarks may be brought within the WMAP range by reducing
slightly m_0, but in two cases more substantial changes in m_0 and m_1/2 are
made. Since the WMAP constraint reduces the effective dimensionality of the
CMSSM parameter space, one may study phenomenology along `WMAP lines' in the
(m_1/2, m_0) plane that have acceptable amounts of dark matter. We discuss the
production, decays and detectability of sparticles along these lines, at the
LHC and at linear e+ e- colliders in the sub- and multi-TeV ranges, stressing
the complementarity of hadron and lepton colliders, and with particular
emphasis on the neutralino sector. Finally, we preview the accuracy with which
one might be able to predict the density of supersymmetric cold dark matter
using collider measurements.


title: 3D two-color QCD at finite temperature and baryon density

abstract:
  We study the phase diagram for two-color QCD in three-dimensional spacetime,
as a function of temperature and baryon chemical potential, using the
low-energy effective Lagrangian approach. We show one-loop renormalizability at
zero temperature, and then use the one-loop effective Lagrangian at finite
temperature and chemical potential to show that at low temperature there is a
critical line separating the normal and diquark phase, with this critical line
ending at a tricritical point. This phase structure is qualitatively similar to
that found recently by Splittorff et al for two-color QCD in four-dimensional
spacetime, although the details are quite different, due to the different
symmetries and the different loop and infrared properties of three-dimensional
spacetime.


title: CP and T Violation in Neutrino Oscillations

abstract:
  In this short lecture, we discuss some basic phenomenological aspects of CP
and T violation in neutrino oscillation. Using CP/T trajectory diagrams in the
bi-probability space, we try to sketch out some essential features of the
interplay between the effect of CP/T violating phase and that of the matter in
neutrino oscillation.


title:
Next-to-leading order QCD calculations with parton showers I: collinear
  singularities

abstract:
  Programs that calculate observables in quantum chromodynamics at
next-to-leading order typically suffer from the problem that, when considered
as event generators, the events generated consist of partons rather than
hadrons and just a few partons at that. Thus the events generated are
completely unrealistic. These programs would be much more useful if the few
partons were turned into parton showers, in the style of standard Monte Carlo
event generators. Then the parton showers could be given to one of the Monte
Carlo event generators to produce hadron showers. We show how to generate
parton showers related to the final state collinear singularities of the
next-to-leading order perturbative calculation for the example of e+ + e- --> 3
jets . The soft singularities are left for a separate publication.


title: Implications of Local Chiral Symmetry Breaking

abstract:
  The spontaneous symmetry breaking of a local chiral symmetry to its diagonal
vector symmetry naturally realizes a complete geometrical structure more
general than that of Yang-Mills (YM) theory, rather similar to that of gravity.
A good example is the Quantum Chromodynamics (QCD) with respect to the Chiral
Color model. Also, a new anomaly-free particle content for a Chiral Color model
is introduced: the Chiral Color can be realized without introducing whole new
generations of quarks and leptons, but by simply enlarging each generation with
new exotic fermions.


title: A Monte Carlo Test of the Optimal Jet Definition

abstract:
  We summarize the Optimal Jet Definition and present the result of a benchmark
Monte Carlo test based on the W-boson mass extraction from fully hadronic
decays of pairs of W's.


title: Flavor Asymmetry of the Polarized Light Sea: Models vs. Data

abstract:
  The flavor asymmetry of the polarized light sea, $\Delta \bar u - \Delta \bar
d$, discriminates between different model calculations of helicity densities.
We show that the chiral chromodielectric model, differently from models based
on a $1/N_c$ expansion, predicts a small value for this asymmetry, what seems
in agreement with preliminary HERMES data.


title: Status of the CPT Violating Interpretations of the LSND Signal

abstract:
  We study the status of the CPT violating neutrino mass spectrum which has
been proposed to simultaneously accommodate the oscillation data from LSND,
KamLAND, atmospheric and solar neutrino experiments, as well as the
non-observation of anti-neutrino disappearance in short-baseline reactor
experiments. We perform a three-generation analysis of the global data with the
aim of elucidating the viability of this solution. We find no compatibility
between the results of the oscillation analysis of LSND and all-but-LSND data
sets below 3$\sigma$ CL. Furthermore, the global data without LSND show no
evidence for CPT violation: the best fit point of the all-but-LSND analysis
occurs very close to a CPT conserving scenario.


title: The charged-hadron/pion ratio at the Relativistic Heavy Ion Collider

abstract:
  The hadron/pion ratio is calculated in 200 GeV AuAu collisions at
midrapidity, applying pQCD and non-universal transverse-momentum broadening.
Arguments are presented for such non-universality, and the idea is implemented
in a model, which explains the enhancement of the hadron/pion ratio in central
AuAu collisions. The model also describes the qualitative difference between
the recently-measured dAu nuclear enhancement factors for pions and charged
hadrons.


title: Have mirror micrometeorites been detected?

abstract:
  Slow-moving ($v \sim 15$ km/s) 'dark matter particles' have allegedly been
discovered in a recent experiment. We explore the possibility that these slow
moving dark matter particles are small mirror matter dust particles originating
from our solar system. Ways of further testing our hypothesis, including the
possibility of observing these dust particles in cryogenic detectors such as
NAUTILUS, are also discussed.


title: Fat Branes, Orbifolds and Doublet-Triplet Splitting

abstract:
  A simple higher dimensional mechanism of the doublet-triplet splitting is
presented in a five dimensional supersymmetric SU(5) GUT on $S^1/Z_2$. The
splitting of multiplets is realized by a mass term of Higgs hypermultiplet
which explicitly breaks SU(5) gauge symmetry. Depending on the sign of mass,
zero mode Higgs doublets and triplets are localized on the either side of the
fixed points. The mass splitting is realized due to the difference of
magnitudes of the overlap with a brane localized or a bulk singlet field. No
unnatural fine-tuning of parameters is needed. The proton stability is ensured
by locality {\em without symmetries}. As well as a conventional mass splitting
solution, it is shown that the weak scale Higgs triplet is consistent with the
proton stability. This result might provide an alternative signature of GUT in
future collider experiments.


title: Global Representation of the Fine Structure Constant and its Variation

abstract:
  The fine structure constant, alpha, is shown to be proportional to the ratio
of the quanta of electric and magnetic flux of force of the electron, and
provides a new representation, which is global across all unit systems.
Consequently, a variation in alpha was shown to manifest due to a differential
change in the fraction of the quanta of electric and magnetic flux of force,
while a variation in hcross.c was shown to manifest due to the common mode
change. The representation is discussed with respect to the running of the fine
structure constant at high energies (small distances), and a putative temporal
drift. It is shown that the running of the fine structure constant is due to
equal components of electric screening (polarization of vacuum) and magnetic
anti-screening (magnetization of vacuum), which cause the perceived quanta of
electric charge to increase at small distances, while the magnetic flux quanta
decreases. This introduces the concept of the bare magnetic flux quanta as well
as the bare electric charge. With regards to temporal drift, it is confirmed
that it is impossible to determine which fundamental constant is varying if
alpha varies.

categories: hep-ph astro-ph cond-mat.mes-hall gr-qc quant-ph


title: High energy amplitude as an admixture of "soft" and "hard" Pomerons

abstract:
  In this paper an attempt is made to find an interface of the perturbative
BFKL Pomeron with the non-perturbative Pomeron originating from
non-perturbative QCD phenomena such as QCD instantons and/or scale anomaly. The
main idea is that the non-perturbative Pomeron involves a large scale ($M_0
\approx 2 GeV $), which is larger than the scale from which perturbative QCD is
applicable. One key result is that even for processes involving a large hard
scale (such as DIS) the low $x$ behavior is determined by an effective Pomeron
with an intercept having an essential non-perturbative QCD contribution.


title: Vector Meson Photoproduction from the BFKL Equation I: Theory

abstract:
  Diffractive vector meson photoproduction accompanied by proton dissociation
is studied for large momentum transfer. The process is described by the
non-forward BFKL equation, for which a complete analytical solution is found.
The scattering amplitudes for all combinations of helicity are presented.


title: Relic neutrinos: neutrino properties from cosmology

abstract:
  After a short introduction on the predicted cosmic neutrino background in the
universe, we review some of the cosmological bounds related to neutrinos. In
particular we show how the recent data on the anisotropies of the cosmic
microwave background radiation from the WMAP satellite, combined with other
experimental results, can constrain the radiation content of the universal
energy density and the sum of neutrino masses.


title:
Electroweak Radiative Corrections to Associated WH and ZH Production at
  Hadron Colliders

abstract:
  Higgs-boson production in association with W or Z bosons, p pbar -> WH/ZH +
X, is the most promising discovery channel for a light Standard Model Higgs
particle at the Fermilab Tevatron. We present the calculation of the
electroweak O(alpha) corrections to these processes. The corrections decrease
the theoretical prediction by up to 5-10%, depending in detail on the
Higgs-boson mass and the input-parameter scheme. We update the cross-section
prediction for associated WH and ZH production at the Tevatron and at the LHC,
including the next-to-leading order electroweak and QCD corrections, and study
the theoretical uncertainties induced by factorization and renormalization
scale dependences and by the parton distribution functions.


title: Quenching of hadron spectra in DIS on nuclear targets

abstract:
  The multiple scatterings incurred by a hard quark produced in a nuclear
medium induce the emission of soft gluons which carry a fraction of the quark
energy and eventually affect the hadronization process. Here, the depletion of
semi-inclusive hadron spectra in DIS on various nuclei (N, Ne, Cu, Kr) is
computed as a function of nu and z to leading order in alpha_s through
medium-modified fragmentation functions. Using the transport coefficient q
previously determined from Drell-Yan production, the predictions are found to
be in good agreement with EMC and HERMES preliminary data. Calculations on Xe
targets are also presented and discussed.


title:
Ultra High Energy Cosmic Rays and Air Shower Simulations: a top-bottom
  view

abstract:
  Stable Superstring Relics (SSR) provide some of the candidates for the
possible origin of the Ultra High Energy Cosmic Rays (UHECR). After a brief
overview of the motivations for introducing such relics, we address the
question whether statistical fluctuations in the formation of the air showers
generated by the primary spectrum of protons can be separated from a possible
signal of new physics hidden in the first impact with the atmosphere. Our
results are generated by using minimal modifications in the cross section of
the primaries, and using available simulation codes used by the experimental
collaborations. The results indicate that substantial increases in the cross
section of the first impact, possibly due to new interactions, are unlikely to
be detected in geometrical and/or variations of multiplicities in the cascade.


title: Charmed and Charmed-Strange Mesons in Kaluza-Klein Picture

abstract:
  In the present paper, we continue our study the structure of hadronic
spectra, started in Refs. \cite{1,2,3,4,5}, from the view point of existence
the extra dimensions in the spirit of Kaluza-Klein approach. We show that all
charmed and charmed-strange mesons, including the recently observed new states
\cite{7,8}, are excellently incorporated in the systematics provided by
Kaluza-Klein approach.


title:
Ultra High Energy Cosmic Rays, Z-Shower and Neutrino Astronomy by
  Horizontal-Upward Tau Air-Showers

abstract:
  Ultra High Cosmic Rays (UHECR) Astronomy may be correlated to a primary
parental Neutrino Astronomy: indeed any far BL Lac Jet or GRB, sources of
UHECR, located at cosmic edges, may send its signal, overcoming the severe GZK
cut-off, by help of UHE ZeV energetic neutrino primary. These UHE neutrino
scattering on relic light ones (spread on wide Hot Local Groups Halos) maybe
fine-tuned : E_(nu) =(M_Z)^2/m_(nu) = 4 10^(22) eV *((0.1eV)/m_(nu)), to
combine at once the observed light neutrino masses and the UHECR spectra,
leading to a relativistic Z-Shower in Hot Dark Halos (e few tens Mpc wide)
whose final nuclear component traces the UHECR event on Earth. Therefore UHECR
(with no longer volme GZK constrains) may point to far BL Lac sources. This
Z-Burst (Z-Shower) model calls for large neutrino fluxes. Even if Nature do not
follow the present Z-model, UHECR while being cut-off by Big Bang Radiation,
must produce a minimal UHE neutrino flux, the GZK neutrino secondaries. For
both reasons such UHE Neutrino Astronomy must be tested on Earth. Lowest High
Energy Astronomy is searched by AMANDA, ANTARES underground deterctors by muons
tracks. We suggest a complementary higher energy Neutrino Tau Astronomy
inducing Horizontal and Upward Tau AirShowers. Possible early evidence of such
a New Neutrino UPTAUs (Upward Tau Showers at PeVs energies) Astronomy may be in
BATSE records of Upward Terrestrial Gamma Flashes. Future signals must be found
in detectors as EUSO, seeking Upward-Horizontal events: indeed even minimal,
guaranteed, GZK neutrino fluxes may be better observed if EUSO threshold
reaches 10^(19) eV by enlarging its telescope size.


title: Neutrino Oscillations, Masses and Mixing

abstract:
  The original B. Pontecorvo idea of neutrino oscillations is discussed.
Neutrino mixing and basics of neutrino oscillations in vacuum and in matter are
considered. Recent evidences in favour of neutrino oscillations, obtained in
Super-Kamiokande, SNO, KamLAND and other neutrino experiments are discussed.
Neutrino oscillations in the solar and atmospheric ranges of the neutrino
mass-squared differences are considered in the framework of the minimal scheme
with the mixing of three massive neutrinos. Results of the tritium beta-decay
experiments and experiments on the search for neutrinoless double-beta-decay
are briefly discussed.


title: CP Violation in Supersymmetric U(1)' Models

abstract:
  The supersymmetric CP problem is studied within superstring-motivated
extensions of the MSSM with an additional U(1)' gauge symmetry broken at the
TeV scale. This class of models offers an attractive solution to the mu problem
of the MSSM, in which U(1)' gauge invariance forbids the bare mu term, but an
effective mu parameter is generated by the vacuum expectation value of a
Standard Model singlet S which has superpotential coupling of the form SH_uH_d
to the electroweak Higgs doublets. The effective mu parameter is thus
dynamically determined as a function of the soft supersymmetry breaking
parameters, and can be complex if the soft parameters have nontrivial
CP-violating phases. We examine the phenomenological constraints on the
reparameterization invariant phase combinations within this framework, and find
that the supersymmetric CP problem can be greatly alleviated in models in which
the phase of the SU(2) gaugino mass parameter is aligned with the soft
trilinear scalar mass parameter associated with the SH_uH_d coupling. We also
study how the phases filter into the Higgs sector, and find that while the
Higgs sector conserves CP at the renormalizable level to all orders of
perturbation theory, CP violation can enter at the nonrenormalizable level at
one-loop order. In the majority of the parameter space, the lightest Higgs
boson remains essentially CP even but the heavier Higgs bosons can exhibit
large CP-violating mixings, similar to the CP-violating MSSM with large mu
parameter.


title: Hunting Radions at Linear Colliders

abstract:
  We investigate the possibility to disentangle the radions in the
Randall-Sundrum scenario from higgs boson at the next generation high energy
$e^+ e^-$ linear colliders. Due to trace anomaly, the radion coupling (and in
turn the branching ratio) to gluons is enhanced over the same for the Standard
Model (SM) higgs. We study the radion production at electron-positron
colliders, via the fusion of W-bosons in association with neutrinos, and
propose to investigate radion decay to a pair of gluons. At 500 GeV center of
mass energy, our signal is not very promising. We find our results are
encouraging for finding radion and differentiating it from higgs for center of
mass energies of 1 TeV and above.


title: The minimal supersymmetric grand unified theory

abstract:
  We show that the minimal renormalizable supersymmetric SO(10) GUT with the
usual three generations of spinors has a Higgs sector consisting only of a
"light" 10-dimensional and "heavy" 126, 126-bar and 210 supermultiplets. The
theory has only two sets of Yukawa couplings with fifteen real parameters and
ten real parameters in the Higgs superpotential. It accounts correctly for all
the fermion masses and mixings. The theory predicts at low energies the MSSM
with exact R-parity. It is arguably the minimal consistent supersymmetric grand
unified theory.


title: Large mixing angles for neutrinos from infrared fixed points

abstract:
  Radiative amplification of neutrino mixing angles may explain the large
values required by solar and atmospheric neutrino oscillations. Implementation
of such mechanism in the Standard Model and many of its extensions (including
the Minimal Supersymmetric Standard Model) to amplify the solar angle, the
atmospheric or both requires (at least two) quasi-degenerate neutrino masses,
but is not always possible. When it is, it involves a fine-tuning between
initial conditions and radiative corrections. In supersymmetric models with
neutrino masses generated through the Kahler potential, neutrino mixing angles
can easily be driven to large values at low energy as they approach infrared
pseudo-fixed points at large mixing (in stark contrast with conventional
scenarios, that have infrared pseudo-fixed points at zero mixing). In addition,
quasi-degeneracy of neutrino masses is not always required.


title: Generalized Random Phase Approximation and Gauge Theories

abstract:
  Mean-field treatments of Yang-Mills theory face the problem of how to treat
the Gauss law constraint. In this paper we try to face this problem by studying
the excited states instead of the ground state. For this purpose we extend the
operator approach to the Random Phase Approximation (RPA) well-known from
nuclear physics and recently also employed in pion physics to general bosonic
theories with a standard kinetic term. We focus especially on conservation
laws, and how they are translated from the full to the approximated theories,
demonstrate that the operator approach has the same spectrum as the RPA derived
from the time-dependent variational principle, and give - for Yang-Mills theory
- a discussion of the moment of inertia connected to the energy contribution of
the zero modes to the RPA ground state energy. We also indicate a line of
thought that might be useful to improve the results of the Random Phase
Approximation.


title: Photon Mass Bound Destroyed by Vortices

abstract:
  The Particle Data Group gives an upper bound on the photon mass $m < 2 \times
10^{-16}$eV from a laboratory experiment and lists, but does not adopt, an
astronomical bound $m < 3 \times 10^{-27}$eV, both of which are based on the
plausible assumption of large galactic vector-potential. We argue that the
interpretations of these experiments should be changed, which alters
significantly the bounds on $m$. If $m$ arises from a Higgs effect, both limits
are invalid because the Proca vector-potential of the galactic magnetic field
may be neutralized by vortices giving a large-scale magnetic field that is
effectively Maxwellian. In this regime, experiments sensitive to the Proca
potential do not yield a useful bound on $m$. As a by-product, the non-zero
photon mass from Higgs effect predicts generation of a primordial magnetic
field in the early universe. If, on the other hand, the galactic magnetic field
is in the Proca regime, the very existence of the observed large-scale magnetic
field gives $m^{-1}\gtrsim 1$kpc, or $m\lesssim 10^{-26}$eV.


title:
The consequences of the relations between non-singlet contributions to
  $g_1^N$ and $F_1^N$ structure functions within infrared renormalon model

abstract:
  We report on the following consequences of the relations between non-singlet
contributions to $g_1^N$ and $F_1^N$ structure functions found within infrared
renormalon model: the discovery of new next-to-leading order inequalities
between non-singlet polarized and unpolarized parton densities, and the
existence of the effects of similarity between non-perturbative and
perturbative contributions to the unpolarized and polarized Bjorken sum rules.


title:
Probing triple gauge couplings with transverse beam polarisation in e+e-
  -> W+W-

abstract:
  The prospects of measuring triple gauge couplings in W pair production at
future linear colliders with transverse beam polarisation are studied. We
consider CP conserving and CP violating couplings with both real and imaginary
parts. The maximum achievable sensitivity in a simultaneous measurement of all
couplings is determined using optimal observables, extending an earlier
analysis for longitudinal beam polarisation. We find good sensitivity to the
coupling Im(g^R_1 + kappa_R), which is not measurable with longitudinal
polarisation. In contrast, for the real parts (including the CP violating
couplings) the sensitivity is better if both beams are longitudinally
polarised. We conclude that a comprehensive measurement of all triple gauge
couplings requires both transverse and longitudinal beam polarisation.


title: Subtraction terms for one-loop amplitudes with one unresolved parton

abstract:
  Fully differential next-to-next-to-leading order calculations require a
method to cancel infrared singularities. In a previous publication, I discussed
the general setup for the subtraction method at NNLO. In this paper I give all
subtraction terms for electron-positron annihilation associated with one-loop
amplitudes with one unresolved parton. These subtraction terms are integrated
within dimensional regularization over the unresolved one-particle phase space.
The results can be used with all variants of dimensional regularization
(conventional dimensional regularization, the 't Hooft-Veltman scheme and the
four-dimensional scheme).


title:
Sequential vector and axial-vector meson exchange and chiral loops in
  radiative phi decay

abstract:
  We study the radiative $\phi$ decay into $\pi^0 \pi^0 \gamma$ and $\pi^0 \eta
\gamma $ taking into account mechanisms in which there are two sequential
vector-vector-pseudoscalar or axial-vector--vector--pseudoscalar steps followed
by the coupling of a vector meson to the photon, considering the final state
interaction of the two mesons. There are other mechanisms in which two kaons
are produced through the same sequential mechanisms or from $\phi$ decay into
two kaons and then undergo final state interaction leading to the final pair of
pions or $\pi^0 \eta$, this latter mechanism being the leading one. The results
of the parameter free theory, together with the theoretical uncertainties, are
compared with the latest experimental results of KLOE at Frascati.


title: Multi-reggeon compound states and resummed anomalous dimensions in QCD

abstract:
  We perform the OPE analysis of the contribution of colour-singlet compound
states of reggeized gluons to a generic hard process in QCD and calculate the
spectrum of the corresponding higher twist anomalous dimensions in multi-colour
limit. These states govern high energy asymptotics of the structure functions
and their energies define the intercept of the Regge singularities both in the
Pomeron and the Odderon sectors. We argue that due to nontrivial analytical
properties of the energy spectrum, the twist expansion does not hold for the
gluonic states with the minimal energy generating the leading Regge
singularities. It is restored however after one takes into account the states
with larger energies whose contribution to the Regge asymptotics is subleading.


title: Weak Decay Form Factors from QCD Sum Rules on the Light-Cone

abstract:
  I present a compilation of results on B->light meson form factors from QCD
sum rules on the light-cone.


title: Inverted Hierarchical Model of Neutrino Masses Revisited

abstract:
  In this letter we highlight the inherent problems associted with the inverted
hierarchical model of neutrinos with only three generations and suggest
possible solutions within the MSSM. we discuss the new parametrisation of the
solar mixing angle which can identify the light side and dark side of the data.
We then argue whether the inverted hierarchical neutrino mass matrix can
explain the large mixing angle(LMA) MSW solution of the solar neutrino anomaly
in the presence of an appropriate texture of charged lepton mass matrix. In
model independent way we explore such specific form of the charged lepton mass
matrix having special structure in 1-2 block. The contribution to the solar
mass splitting arising out of radiative corrections in MSSM, is calculated,
thus making the model stable under radiative corrections.


title: Charmed Meson Decays and QCD Sum Rules

abstract:
  The current status of the QCD sum rule predictions for charmed mesons is
overviewed.


title: Strong Phases and Factorization for Color Suppressed Decays

abstract:
  We prove a factorization theorem in QCD for the color suppressed decays B0->
D0 M0 and B0-> D*0 M0 where M is a light meson. Both the color-suppressed and
W-exchange/annihilation amplitudes contribute at lowest order in LambdaQCD/Q
where Q={mb, mc, Epi}, so no power suppression of annihilation contributions is
found. A new mechanism is given for generating non-perturbative strong phases
in the factorization framework. Model independent predictions that follow from
our results include the equality of the B0 -> D0 M0 and B0 -> D*0 M0 rates, and
equality of non-perturbative strong phases between isospin amplitudes,
delta(DM) = delta(D*M). Relations between amplitudes and phases for M=pi,rho
are also derived. These results do not follow from large Nc factorization with
heavy quark symmetry.