title:
New Index of CP Phase Effect and $\theta_{13}$ Screening in Long
  Baseline Neutrino Experiments

abstract:
  We introduce a new index of the leptonic CP phase dependence $I_{\rm CP}$ and
derive the maximal condition for this index in a simple and general form.
$I_{\rm CP}\simeq 100%$ may be realized even in the JPARC experiment. In the
case that the 1-3 mixing angle can be observed in the next generation reactor
experiments, namely $\sin^2 2\theta_{13}>0.01$, and nevertheless $\nu_e$
appearance signal cannot be observed in the JPARC experiment, we conclude that
the CP phase $\delta$ becomes a value around $135^{\circ}$ $(45^{\circ})$ for
$\Delta m^2_{31}>0$ $(\Delta m^2_{31}<0)$ without depending the uncertainties
of solar and atmospheric parameters.


title: Three Flavour QCD from the Holographic Principle

abstract:
  Building on recent research into five-dimensional holographic models of QCD,
we extend this work by including the strange quark with an SU(3)_L\times
SU(3)_R gauge symmetry in the five-dimensional theory. In addition we deform
the naive $AdS$ metric with a single parameter, thereby breaking the conformal
symmetry at low energies. The vector and axial vector sectors are studied in
detail and both the masses and decay constants are calculated with the
additional parameters. It is shown that with a single extra degree of freedom,
exceptional agreement with experimental results can be obtained in the light
quark sector while the kaon sector is found to give around 10% agreement with
lattice results. We propose some simple extensions to this work to be taken up
in future research.


title: MRST partons generated in a fixed-flavour scheme

abstract:
  We generate fixed three- and four-light-flavour sets of partons using
MRST2004 partons as input. We show that it is important to set n_f=3 in the
strong coupling, as well as in the splitting and coefficient functions, in
order to obtain a consistent set of fixed-flavour partons. We compare the
description of data using partons in both variable- and
fixed-flavour-number-schemes.


title:
The piN --> etaN data demand the existence of N(1710) P11 resonance
  reducing the 1700 MeV continuum ambiguity

abstract:
  In spite of prolonged polemics, the agreement on the existence of N(1710) P11
resonance has not until now been reached, and the Particle Data Group declares
it as a 3-star resonance only. We show that the proper inclusion of inelastic
channels in the coupled-channel formalism indisputably demands the existence of
N(1710) P11 state, and that it presumably stays "hidden" within the continuum
ambiguity of any typical single channel partial wave analyses. Consequently,
its Particle Data Group confidence rating should be raised to a 4-star
resonance.


title: Regularities in electromagnetic decay widths

abstract:
  We revisit Sakurai's remark on the regularities of lepton-pair widths for
mesons, extending the panorama to radiative $X \to \gamma \gamma$ and total
decays. The regularities persist, and somehow surprisingly some of them seem to
relate with Fermi's constant -or $Z^0$-.


title: Can we predict the value of the Higgs mass?

abstract:
  In the framework of the Standard Model the mass of the physical Higgs boson
is an arbitrary parameter. In this note we examine whether it is possible to
determine the ratio of $m_H /M$, where $M$ denotes any other mass in the
theory, such as the $W$ or the $Z$-boson mass. We show that no such relation
can be stable under renormalisation.


title: About the quark currents in leptonic decaies of pseudoscalar mesons

abstract:
  With usage of obvious mechanisms of quark currents the amplitudes of leptonic
decaies of pseudoscalar mesons are investigated. The estimation for a constant
of leptonic decay of the D+ meson is obtained, f_D+ ~ 0.23 GeV.


title: Glueballs, gluerings and gluestars in the d=2+1 SU(N) gauge theory

abstract:
  The 3d gluodynamics which governs the large T quark gluon plasma is studied
in the framework of the field correlator method. Field correlators and spacial
string tension are derived through the gluelump Green's functions. The glueball
spectrum is calculated both in C=-1 as well as in C=+1 sectors, and multigluon
bound states in the form of "gluon rings" and "gluon stars" are computed
explicitly. Good overall agreement with available lattice data is observed.


title: Extended Technicolor Models with Two ETC Groups

abstract:
  We construct extended technicolor (ETC) models that can produce the large
splitting between the masses of the $t$ and $b$ quarks without necessarily
excessive contributions to the $\rho$ parameter or to neutral flavor-changing
processes. These models make use of two different ETC gauge groups, such that
left- and right-handed components of charge $Q=2/3$ quarks transform under the
same ETC group, while left- and right-handed components of charge -1/3 quarks
and charged leptons transform under different ETC groups. The models thereby
suppress the masses $m_b$ and $m_\tau$ relative to $m_t$, and $m_s$ and $m_\mu$
relative to $m_c$ because the masses of the $Q=-1/3$ quarks and charged leptons
require mixing between the two ETC groups, while the masses of the $Q=2/3$
quarks do not. A related source of the differences between these mass
splittings is the effect of the two hierarchies of breaking scales of the two
ETC groups. We analyze a particular model of this type in some detail. Although
we find that this model tends to suppress the masses of the first two
generations of down-type quarks and charged leptons too much, it gives useful
insights into the properties of theories with more than one ETC group.


title: The Large N_c Baryon-Meson I_t = J_t Rule Holds for Three Flavors

abstract:
  It has long been known that nonstrange baryon-meson scattering in the 1/N_c
expansion of QCD greatly simplifies when expressed in terms of t-channel
exchanges: The leading-order amplitudes satisfy the selection rule I_t = J_t.
We show that I_t = J_t, as well as Y_t = 0, also hold for the leading
amplitudes when the baryon and/or meson contain strange quarks, and also
characterize their 1/N_c corrections, thus opening a new front in the
phenomenological study of baryon-meson scattering and baryon resonances.


title: Pion pair production in $e^+e^-$ annihilation

abstract:
  We present an analysis of the process $e^+e^-\to V^*\to\pi\pi\gamma$, where
$V=\gamma$ or $V=Z$ boson, in the kinematical region where $\sqrt{s}$, the c.m.
energy of the $e^+e^-$ pair, is large but much below the $Z$-pole. The
subprocess $V^*\to \pi\pi \gamma$ can be described by the convolution of the
hard scattering coefficient $V\to q \bar{q} \gamma$ and the general
distribution amplitude of two pions $q\bar{q}\to \pi \pi$. In the case of
neutral pion production, $V=\gamma$ is the dominant process, which can
therefore be used to access the GPAs of the pion, especially their $C$-even
parts. The $\gamma Z$ interference term provides an alternative approach to
extract the weak mixing angle $\sin \theta_W$ through measuring the helicity
asymmetry in the process $e^+e^-\to \pi^0\pi^0\gamma$. In the case of charged
pion pair production, the Bremsstrahlung process dominates and its interference
with $e^+e^-\to \gamma^ \star \to \pi^+\pi^-\gamma$ can be applied to study the
process $\gamma^ \star \to \pi\pi\gamma$ at the amplitude level.


title: Neutrino masses in quartification schemes

abstract:
  The idea of quark-lepton universality at high energies has recently been
explored in unified theories based upon the quartification gauge group SU(3)^4.
These schemes encompass a quark-lepton exchange symmetry that results upon the
introduction of leptonic colour. It has been demonstrated that in models in
which the quartification gauge symmetry is broken down to the standard model
gauge group, gauge coupling constant unification can be achieved, and there is
no unique scenario. The same is also true when the leptonic colour gauge group
is only partially broken, leaving a remnant SU(2)_\ell symmetry at the standard
model level. Here we perform an analysis of the neutrino mass spectrum of such
models. We show that these models do not naturally generate small Majorana
neutrino masses, thus correcting an error in our earlier quartification paper,
but with the addition of one singlet neutral fermion per family there is a
realisation of see-saw suppressed masses for the neutrinos. We also show that
these schemes are consistent with proton decay.


title: The expansion by regions in pi K scattering

abstract:
  We discuss a number of two loop (vertex) integrals relevant for pi K
scattering at threshold. As such these are functions of two well separated mass
scales, M\_pi/M\_K << 1. The method of regions allows an expansion in this mass
ratio prior to the integration. In the cases considered, the coefficients in
this expansion can be evaluated with elementary methods. As a first example of
an application we present the leading strange quark contributions to the pion
mass.


title:
Lowering solar mixing angle in inverted hierarchy without charged lepton
  corrections

abstract:
  In the present work, the inverted hierarchical neutrino mass model which is
characterised by opposite CP parity in the first two mass eigenvalues
$(m_1,-m_2,m_3)$, is studied in order to lower the predicted value of solar
mixing angle $\tan^2\theta_{12}$, from the tri-bimaximal mixing (TBM), without
sacrificing the conditions of maximal atmospheric mixing angle and zero reactor
angle. The present attempt is different from the earlier approach where the
correction from the charged lepton mass matrix is included in the leptonic
mixing matrix to lower the prediction on solar mixing angle. The lowering of
the solar mixing angle without charged lepton correction, can be obtained
through the variation of the input value of a flavour twister term present in
the texture of neutrino mass matrix having a 2-3 symmetry. The present analysis
agrees with the latest experimental bounds on neutrino mass parameters and also
represents an important result on the survival of the inverted hierarchical
neutrino mass models having opposite CP parity in the first two eigenvalues.


title:
NuTeV $\sin ^2 \theta_{\rm W}$ anomaly and nuclear parton distributions
  revisited

abstract:
  By studying the Paschos-Wolfenstein (PW) ratio of deep inelastic $\nu{\rm
Fe}$ and $\bar \nu{\rm Fe}$ scattering cross sections, we show that it should
be possible to explain the NuTeV $\sin ^2 \theta_{\rm W}$ anomaly with quite
conventional physics, by introducing mutually different nuclear modifications
for the valence-$u$ and valence-$d$ quark distributions of the protons in iron.
Keeping the EKS98 nuclear modifications for $u_V+d_V$ as a baseline, we find
that some 20-30 % nuclear modifications to the $u_V$ and $d_V$ distributions
account for the change induced in the PW ratio by the NuTeV-suggested increase
$\Delta \sin ^2 \theta_{\rm W}=0.005$. We show that introduction of such
nuclear modifications in $u_V$ and $d_V$ individually, does not lead into
contradiction with the present global DGLAP analyses of the nuclear parton
distributions, where deep inelastic $lA$ scattering data and Drell-Yan dilepton
data from $pA$ collisions are used as constraints. We thus suggest that the
NuTeV result serves as an important further constraint in pinning down the
nuclear effects of the bound nucleon PDFs. We also predict that if the NuTeV
anomaly is explained by this mechanism, the NOMAD experiment should see an
increase in the weak mixing angle quite close to the NuTeV result.


title: A Study on the structure of proton

abstract:
  The structure function of the proton has been investigated and has been found
to possess the power law behaviour in conformity with the empirical fits to the
experimental findings. We have estimated F$_{2}$(x, Q$^{2}$)/F$_{2}$(x,
Q$_{0}$$^{2}$) with the anomalous dimension D$_{A}$ predicted from the
statistical model as an input and the result is found to be in good agreement
with the recent data available in the deep inelastic region.


title: Hadronic mass and q^2 moments in B->Xu l nu

abstract:
  We present OPE predictions for the hadronic mass and q^2 moments in inclusive
semileptonic charmless B decays, with a lower cut on the charged lepton energy
and an upper cut on the hadronic invariant mass. We include non-perturbative
corrections through O(1/m_b^3) and perturbative contributions through
O(alpha_s^2 beta_0). We also investigate the range of the cut on the hadronic
mass for which the local OPE can be considered valid and give estimates of the
residual theoretical uncertainty. The study of these moments is important to
constrain the effect of the Weak Annihilation (WA) contributions and the shape
of the distribution function, providing a more precise inclusive determination
of V_ub.


title:
Family Symmetry and Single Right-Handed Neutrino Dominance in Five
  Dimensions

abstract:
  We consider several neutrino mass models in an extra-dimensional setting on a
quantitative level. All the models are set in a five-dimensional scenario, with
the standard model (SM) particles living on a brane, while three additional SM
gauge singlets live in the bulk of an extra dimension, which is compactified on
a S^1/Z_2 orbifold. The spontaneous breaking of an additional, continuous U(1)
family symmetry is used to generate suitable neutrino mass matrices via single
right-handed neutrino dominance through the corresponding five-dimensional
extension of the see-saw mechanism. In this manner possible problems of this
combination for some models in four dimensions could be overcome. The
considered models differ with respect to the charges under the family symmetry
and the nature of the five-dimensional Majorana mass term.


title:
New physics beyond the standard model of particle physics and parallel
  universes

abstract:
  It is shown that if - and only if - ``parallel universes'' exist, an
electroweak vacuum that is expected to have decayed since the big bang with a
high probability might exist. It would neither necessarily render our existence
unlikely nor could it be observed. In this special case the observation of
certain combinations of Higgs-boson and top-quark masses - for which the
standard model predicts such a decay - cannot be interpreted as evidence for
new physics at low energy scales. The question of whether parallel universes
exist is of interest to our understanding of the standard model of particle
physics.


title:
Charged Lepton Radiative and B-meson Double Radiative Decays in Models
  with Universal Extra Dimensions

abstract:
  This paper addresses the role of Large Extra Dimensions in some flavor
changing neutral current (FCNC) driven processes. In particular we have
investigated radiative decays of charged leptons within models with only one
universal extra dimension (UED). Loop contributions with internal fermions and
scalars of comparable mass would seem to yield sizeable amplitudes, since the
generic quadratic suppression factor is changed into a linear one. Such
scenarios can in principle be realized in models with universal extra space
dimensions. Yet our calculations of the Kaluza-Klein (KK) contributions to
these radiative decays show this expected relative enhancement to disappear due
to the near mass degeneracy of the heavy neutrinos from the different
generations. In this paper we estimate also the UED contribution to the
$B_{s,d}\to\gamma\gamma$ rate and find an enhancement of 3% and 6%,
respectively, over the SM prediction.


title:
On the Numerical Evaluation of a Class of Oscillatory Integrals in
  Worldline Variational Calculations

abstract:
  Filon-Simpson quadrature rules are derived for integrals of the type \int_a^b
dx f(x) sin(xy)/(xy) and \int_a^b dx f(x) 4 sin^2(xy/2)/(xy)^2 which are needed
in applications of the worldline variational approach to Quantum Field Theory.
These new integration rules reduce to the standard Simpson rule for y = 0 and
are exact for y \to \infty when a = 0 and f(0) \ne 0.The subleading term in the
asymptotic expansion is also reproduced more and more precisely when the number
of integration points is increased. Tests show that the numerical results are
indeed stable over a wide range of y-values whereas usual Gauss-Legendre
quadrature rules are more precise at low y but fail completely for large values
of y. The associated Filon-Simpson weights are given in terms of sine and
cosine integrals and have to be evaluated for each value of y. A Fortran
program to calculate them in a fast and accurate manner is available. A
detailed comparison with the double exponential method of Ooura and Mori is
made.


title: The Passage of Ultrarelativistic Neutralinos through Matter

abstract:
  The origin of the most energetic cosmic ray events, with $E \gsim 10^{20}$
eV, remains mysterious. One possibility is that they are produced in the decay
of very massive, long--lived particles. It has been suggested that these
so--called ``top--down scenarios'' can be tested by searching for
ultrarelativistic neutralinos, which would be produced copiously if
superparticles exist at or near the TeV scale. In this paper we present a
detailed analysis of the interactions of such neutralinos with ordinary matter.
To this end we compute several new contributions to the total interaction cross
section; in particular, the case of higgsino--like neutralinos is treated for
the first time. We also carefully solve the transport equations. We show that a
semi--analytical solution that has been used in the literature to treat the
somewhat analogous propagation of $\tau$ neutrinos leads to large errors; we
therefore use a straightforward numerical method to solve these
integro--differential equations.


title:
Color-superconductivity in the strong-coupling regime of Landau gauge
  QCD

abstract:
  The chirally unbroken and the superconducting 2SC and CFL phases are
investigated in the chiral limit within a Dyson-Schwinger approach for the
quark propagator in QCD. The hierarchy of Green's functions is truncated such
that at vanishing density known results for the vacuum and at asymptotically
high densities the corresponding weak-coupling expressions are recovered. The
anomalous dimensions of the gap functions are analytically calculated. Based on
the quark propagator the phase structure is studied, and results for the gap
functions, occupation numbers, coherence lengths and pressure differences are
given and compared with the corresponding expressions in the weak-coupling
regime. At moderate chemical potentials the quasiparticle pairing gaps are
several times larger than the extrapolated weak-coupling results.


title: Dynamic Properties of Charmonium

abstract:
  Nonrelativistic quark models of charmonia are tested by comparison of
theoretical charmonium decay constants, form factors, and $\gamma\gamma$ widths
with experiment and lattice gauge computations. The importance of relativistic
effects, a running coupling, and the correct implementation of bound state
effects are demonstrated. We describe how an improved model and computational
techniques resolve several outstanding issues in previous nonrelativistic quark
models such as the use of `correction' factors in quark model form factors,
artificial energy prescriptions in decay constant calculations, and ad hoc
phase space modifications. We comment on the small experimental value of
$f_{\psi''}$ and the D-wave component of the $J/\psi$. Decay constants and
$\gamma\gamma$ widths for bottomonium are also presented.


title: Abundance of Cosmological Relics in Low-Temperature Scenarios

abstract:
  We investigate the relic density n_\chi of non-relativistic long-lived or
stable particles \chi in cosmological scenarios in which the temperature T is
too low for \chi to achieve full chemical equilibrium. The case with a heavier
particle decaying into \chi is also investigated. We derive approximate
solutions for n_\chi(T) which accurately reproduce numerical results when full
thermal equilibrium is not achieved. If full equilibrium is reached, our ansatz
no longer reproduces the correct temperature dependence of the \chi number
density. However, it does give the correct final relic density, to an accuracy
of about 3% or better, for all cross sections and initial temperatures.


title: Experimental indication on chiral symmetry restoration in meson spectrum

abstract:
  The spectroscopic predictions of the Ademollo-Veneziano-Weinberg dual model
are critically tested in view of the modern experimental data. The predicted
equidistance of masses squared for chiral partners is shown to be violated high
in energies, instead one observes an approximate degeneracy of these
quantities. This phenomenon can be interpreted as the restoration of
Wigner-Weyl realization of chiral symmetry for highly excited states. The scale
of complete restoration is expected to be 2.5 GeV. A multispin-parity cluster
structure of meson spectrum is revealed.


title:
Boson Fusion and Higgs production at the LHC in six fermion final states
  with one charged lepton pair

abstract:
  Boson boson scattering and Higgs production in boson boson fusion will be
actively investigated at the LHC. We have performed a parton level study of all
processes of the type $q_1 q_2 \to q_3 q_4 q_5 q_6 l^+l^-$ using for the first
time a full fledged six fermion Monte Carlo event generator which employs exact
matrix elements at $\O(\alpha_{em}^6)$. We have examined Higgs production in
vector boson fusion followed by the decay chain $H\to ZZ\to l^+l^-jj$,
including exactly all electroweak irreducible backgrounds. In the high mass
region we have compared the case of a relatively light Higgs with the no-Higgs
case. The integrated cross section for the latter case is more than twice that
in the former for a minimum invariant mass of the $ZV$ pair of about 800 \GeV.
We find, in a preliminary anlysis at parton level that, summing up the muon and
the electron channels, about 30 events are expected in the light Higgs case for
L=100 $fb^{-1}$.


title:
Spontaneous Symmetry Breakdown and Critical Perspectives of Higgs
  Mechanism

abstract:
  The foundations of the mass generation mechanism of particles are reviewed.
The Spontaneous Symmetry Breaking (SSB) process within the standard model (SM)
and the minimal supersymmetric standard model (MSSM) is used to explore the
present status of the Higgs Mechanism along with the constraints in detecting
the Higgs particles in experiments. The possible explanations and
generalizations for the case that the Higgs particles should not appear or to
couple the Higgs Mechanism (because of their gravitational nature of
interaction) are also iscussed in detail in view of the Higgs field gravity.


title: Constraining SUSY GUTs and Inflation with Cosmology

abstract:
  In the framework of Supersymmetric Grand Unified Theories (SUSY GUTs), the
universe undergoes a cascade of symmetry breakings, during which topological
defects can be formed. We address the question of the probability of cosmic
string formation after a phase of hybrid inflation within a large number of
models of SUSY GUTs in agreement with particle and cosmological data. We show
that cosmic strings are extremely generic and should be used to relate
cosmology and high energy physics. This conclusion is employed together with
the WMAP CMB data to strongly constrain SUSY hybrid inflation models. F-term
and D-term inflation are studied in the SUSY and minimal SUGRA framework. They
are both found to agree with data but suffer from fine tuning of their
superpotential coupling (\lambda \lesssim 3\times 10^(-5) or less). Mass scales
of inflation are also constrained to be less than M \lesssim 3\times 10^(15)
GeV.


title:
The pion-pion scattering amplitude. II: Improved analysis above
  $\bar{K}K$ threshold

abstract:
  We improve, in the energy region between $\bar{K}K$ threshold and $\sim~1.4$
GeV, the energy-dependent phase shift analysis of $\pi\pi$ scattering presented
in a previous paper. For the S0 wave we have included more data above
$\bar{K}K$ threshold and we have taken into account systematically the
elasticity data on the reaction $\pi\pi\to\bar{K}K$. We here made a coupled
channel fit. For the D0 wave we have considered information on low energy
parameters, and imposed a better fit to the $f_2$ resonance. For both waves the
expressions we now find are substantially more precise than the previous ones.
We also provide slightly improved D2 and P waves, including the estimated
inelasticity for the first, and a more flexible parametrization between 1 and
1.42 GeV for the second. The accuracy of our amplitudes is now such that it
requires a refinement of the Regge analysis, for $s^{1/2}\geq1.42$ GeV, which
we also carry out. We show that this more realistic input produces $\pi\pi$
scattering amplitudes that satisfy better forward dispersion relations,
particularly for $\pi^0\pi^0$ scattering.


title:
Constrained invariant mass distributions in cascade decays. The shape of
  the "$m_{qll}$-threshold" and similar distributions

abstract:
  Considering the cascade decay $D\to c C \to c b B \to c b a A$ in which
$D,C,B,A$ are massive particles and $c,b,a$ are massless particles, we
determine for the first time the shape of the distribution of the invariant
mass of the three massless particles $m_{abc}$ for the sub-set of decays in
which the invariant mass $m_{ab}$ of the last two particles in the chain is
(optionally) constrained to lie inside an arbitrary interval, $m_{ab} \in [
m_{ab}^\text{cut min}, m_{ab}^\text{cut max}]$. An example of an experimentally
important distribution of this kind is the ``$m_{qll}$ threshold'' -- which is
the distribution of the combined invariant mass of the visible standard model
particles radiated from the hypothesised decay of a squark to the lightest
neutralino via successive two body decay,: $\squark \to q \ntlinoTwo \to q l
\slepton \to q l l \ntlinoOne $, in which the experimenter requires
additionally that $m_{ll}$ be greater than ${m_{ll}^{max}}/\sqrt{2}$. The
location of the ``foot'' of this distribution is often used to constrain
sparticle mass scales. The new results presented here permit the location of
this foot to be better understood as the shape of the distribution is derived.
The effects of varying the position of the $m_{ll}$ cut(s) may now be seen more
easily.


title: Physics potential of the CERN-MEMPHYS neutrino oscillation project

abstract:
  We consider the physics potential of CERN based neutrino oscillation
experiments consisting of a Beta Beam (BB) and a Super Beam (SPL) sending
neutrinos to MEMPHYS, a 440 kt water \v{C}erenkov detector at Frejus, at a
distance of 130 km from CERN. The $\theta_{13}$ discovery reach and the
sensitivity to CP violation are investigated, including a detailed discussion
of parameter degeneracies and systematical errors. For SPL sensitivities
similar to the ones of the phase II of the T2K experiment (T2HK) are obtained,
whereas the BB may reach significantly better sensitivities, depending on the
achieved number of total ion decays. The results for the CERN-MEMPHYS
experiments are less affected by systematical uncertainties than T2HK. We point
out that by a combination of data from BB and SPL a measurement with
antineutrinos is not necessary and hence the same physics results can be
obtained within about half of the measurement time compared to one single
experiment. Furthermore, it is shown how including data from atmospheric
neutrinos in the MEMPHYS detector allows to resolve parameter degeneracies and,
in particular, provides sensitivity to the neutrino mass hierarchy and the
octant of $\theta_{23}$.


title: Rare semileptonic meson decays in R-parity violating MSSM

abstract:
  We discuss rare meson decays $K^ + \to \pi ^ - \ell ^ + \ell '^ + $ and $D^ +
\to K^ - \ell ^ + \ell '^ +$ ($\ell, \ell'=e, \mu$) in a supersymmetric
extension of the Standard Model with R-parity violation. Estimates of the
branching ratios for these decays are presented.


title: Gap in the black-body spectrum at low temperature

abstract:
  We postulate that the U(1)$_Y$ factor of the Standard Model is an effective
manifestation of SU(2) gauge dynamics being dynamically broken by
nonperturbative effects. The modified propagation properties of the photon at
low temperatures and momenta are computed. As a result of strong screening, the
presence of a sizable gap in the spectral power of a black body at temperatures
$T=5... 20 $K and for low frequencies is predicted: A table-top experiment
should be able to discover this gap. If the gap is observed then the Standard
Model's mechanism for electroweak symmetry-breaking is endangered by a
contradiction with Big-Bang nucleosynthesis. Based on our results, we propose
an explanation for the stability of cold, old, dilute, and large clouds of
atomic hydrogen in between spiral arms of the outer galaxy.


title: PYTHIA 6.4 Physics and Manual

abstract:
  The PYTHIA program can be used to generate high-energy-physics `events', i.e.
sets of outgoing particles produced in the interactions between two incoming
particles. The objective is to provide as accurate as possible a representation
of event properties in a wide range of reactions, within and beyond the
Standard Model, with emphasis on those where strong interactions play a role,
directly or indirectly, and therefore multihadronic final states are produced.
The physics is then not understood well enough to give an exact description;
instead the program has to be based on a combination of analytical results and
various QCD-based models. This physics input is summarized here, for areas such
as hard subprocesses, initial- and final-state parton showers, underlying
events and beam remnants, fragmentation and decays, and much more. Furthermore,
extensive information is provided on all program elements: subroutines and
functions, switches and parameters, and particle and process data. This should
allow the user to tailor the generation task to the topics of interest.


title: Relation between quark and gluon condensates from QCD sum rules

abstract:
  A new relation between $\rho$-meson mass, weak $\pi$-meson decay constant,
quark and gluon condensates is derived from the QCD sum rules. As a byproduct
an explanation for the dominance of $\rho\rho$-decay for the $f_0(1370)$-meson
is proposed.


title:
Next-to-leading order QCD corrections to W+W- production via
  vector-boson fusion

abstract:
  Vector-boson fusion processes constitute an important class of reactions at
hadron colliders, both for signals and backgrounds of new physics in the
electroweak interactions.
  We consider what is commonly referred to as W+W- production via vector-boson
fusion (with subsequent leptonic decay of the Ws), or, more precisely, e+ nu_e
mu- nubar_mu + 2 jets production in proton-proton scattering, with all resonant
and non-resonant Feynman diagrams and spin correlations of the final-state
leptons included, in the phase-space regions which are dominated by t-channel
electroweak-boson exchange.
  We compute the next-to-leading order QCD corrections to this process, at
order alpha^6 alpha_s.
  The QCD corrections are modest, changing total cross sections by less than
10%. Remaining scale uncertainties are below 2%. A fully-flexible
next-to-leading order partonic Monte Carlo program allows to demonstrate these
features for cross sections within typical vector-boson-fusion acceptance cuts.
Modest corrections are also found for distributions.


title:
A Comment on the Measurement of Neutrino Masses in Beta-Decay
  Experiments

abstract:
  We discuss the physics potential of future tritium beta-decay experiments
having a sensitivity to a neutrino mass ~\sqrt{|\Delta m^{2}_{23}|}~5x10^{-2}
eV. The case of three-neutrino mixing is analised. A negative result of such an
experiment would imply that the neutrino mass spectrum is of normal
hierarchical type. The interpretation of a positive result would depend on the
value of the lightest neutrino mass; if the lightest neutrino mass satisfies
the inequality min(m_j) << \sqrt{|\Delta m^{2}_{23}|}, it would imply that the
neutrino mass spectrum is of the inverted hierarchical type.


title:
Instability of a gapless color superconductor with respect to
  inhomogeneous fluctuations

abstract:
  We systematically apply density functional theory to determine the kind of
inhomogeneities that spontaneously develop in a homogeneous gapless phase of
neutral two-flavor superfluid quark matter. We consider inhomogeneities in the
quark and electron densities and in the phases and amplitude of the order
parameter. These inhomogeneities are expected to lead the gapless phase to a
BCS-normal coexisting phase, a Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) state
with phase oscillations alone, and a LOFF state with amplitude oscillations. We
find that which of them the homogeneous system tends towards depends
sensitively on the chemical potential separation between up and down quarks and
the gradient energies.


title:
Implications of Direct Dark Matter Constraints for Minimal
  Supersymmetric Standard Model Higgs Boson Searches at the Tevatron

abstract:
  Searches for the Minimal Supersymmetric Standard Model (MSSM) Higgs bosons
are among the most promising channels for exploring new physics at the
Tevatron. In particular, interesting regions of large $\tan \beta$ and small
$m_A$ are probed by searches for heavy neutral Higgs bosons, A and H, when they
decay to $\tau^+ \tau^-$ and $b\bar{b}$. At the same time, direct searches for
dark matter, such as CDMS, attempt to observe neutralino dark matter particles
scattering elastically off nuclei. This can occur through t-channel Higgs
exchange, which has a large cross section in the case of large $\tan \beta$ and
small $m_A$. As a result, there is a natural interplay between the heavy,
neutral Higgs searches at the Tevatron and the region of parameter space
explored by CDMS. We show that if the lightest neutralino makes up the dark
matter of our universe, current limits from CDMS strongly constrain the
prospects of heavy, neutral MSSM Higgs discovery at the Tevatron (at 3 sigma
with 4 fb^-1 per experiment) unless $|\mu| \gsim$ 400 GeV. The limits of CDMS
projected for 2007 will increase this constraint to $|\mu| \gsim$ 800 GeV. On
the other hand, if CDMS does observe neutralino dark matter in the near future,
it will make the discovery of heavy, neutral MSSM Higgs bosons far more likely
at the Tevatron.


title:
On the Hamiltonian Form of Generalized Dirac Equation for Fermions with
  Two Mass States

abstract:
  Dynamical and non-dynamical components of the 20-component wave function are
separated in the generalized Dirac equation of the first order, describing
fermions with spin 1/2 and two mass states. After the exclusion of the
non-dynamical components, we obtain the Hamiltonian Form of equations. Minimal
and non-minimal electromagnetic interactions of particles are considered here.


title: The W boson production cross section at the LHC through O(alpha_s^2)

abstract:
  We compute the O(alpha_s^2) QCD corrections to the fully differential
cross-section pp \to W X \to l \nu X, retaining all effects from spin
correlations. The knowledge of these corrections makes it possible to calculate
with high precision the W boson production rate and acceptance at the LHC,
subject to realistic cuts on the lepton and missing energy distributions. For
certain choices of cuts we find large corrections when going from
next-to-leading order (NLO) to next-to-next-to-leading order (NNLO) in
perturbation theory. These corrections are significantly larger than those
obtained by parton-shower event generators merged with NLO calculations. Our
calculation may be used to assess and significantly reduce the QCD
uncertainties in the many studies of $W$ boson production planned at the LHC.


title: Landau gauge condensates from global color model

abstract:
  We compute the dimension-2 gluon pair condensate $g^2<{AA}>$ and the
dimension-4 mixed quark-gluon condensate $<\bar{q}gA\cdot\gamma{q}>$ in Landau
gauge within the framework of global color model. The result for the dynamical
gluon mass is within the range given by other independent determinations. The
obtained mixed Landau gauge condensate $<\bar{q}gA\cdot\gamma{q}>$ is clearly
dependent on the definitions of the condensates. We show that the consistent
result may be obtained when the same definitions are used.


title:
Rapidity and centrality dependence in the percolating colour strings
  scenario

abstract:
  In AA collisions fusion and percolation of colour strings is studied at fixed
rapidity $y$. Distribution of strings in rapidity is obtained from the observed
rapidity spectra in pp collisions. For $y$-dependence of multiplicities in
Au-Au collisions good agreement is obtained with the existing experimental
data. Predictions for LHC energies coincide with the extrapolation of the data.
Agreement with the data of the transverse momentum spectra requires
introduction of quenching into the model.


title:
Reconciling the light-cone and nonrelativistic QCD approaches to
  calculating e+ e- -> J/psi + eta_c

abstract:
  It has been suggested in Ref. [A. E. Bondar and V. L. Chernyak, Phys. Lett. B
612, 215 (2005)] that the disagreement between theoretical calculations and
experimental observations for the rate for the process e+ e- -> J/psi + eta_c
at the B factories might be resolved by using the light-cone method to take
into account the relative momentum of the heavy-quark and antiquark in the
quarkonia. The light-cone result for the production cross section in Ref. [A.
E. Bondar and V. L. Chernyak, Phys. Lett. B 612, 215 (2005)] is almost an order
of magnitude larger than existing NRQCD factorization results. We investigate
this apparent theoretical discrepancy. We compute light-cone distribution
functions by making use of quarkonium wave functions from the Cornell potential
model. Our light-cone distribution functions are similar in shape to those of
Ref. [A. E. Bondar and V. L. Chernyak, Phys. Lett. B 612, 215 (2005)] and yield
a similar cross section. However, when we subtract parts of the light-cone
distribution functions that correspond to corrections of relative-order alpha_s
in the NRQCD approach, we find that the cross section decreases by about a
factor of three. When we set certain renormalization factors Z_i in the
light-cone calculation equal to unity, we find a further reduction in the cross
section of about a factor of two. The resulting light-cone cross section is
similar in magnitude to the NRQCD factorization cross sections and shows only a
modest enhancement over the light-cone cross section in which the relative
momentum of the heavy-quark and antiquark is neglected.


title: Potential-model calculation of an order-v^2 NRQCD matrix element

abstract:
  We present two methods for computing dimensionally-regulated NRQCD
heavy-quarkonium matrix elements that are related to the second derivative of
the heavy-quarkonium wave function at the origin. The first method makes use of
a hard-cutoff regulator as an intermediate step and requires knowledge only of
the heavy-quarkonium wave function. It involves a significant cancellation that
is an obstacle to achieving high numerical accuracy. The second method is more
direct and yields a result that is identical to the Gremm-Kapustin relation,
but it is limited to use in potential models. It can be generalized to the
computation of matrix elements of higher order in the heavy-quark velocity and
can be used to resum the contributions to decay and production rates that are
associated with those matrix elements. We apply these methods to the Cornell
potential model and compute a matrix element for the J/psi state that appears
in the leading relativistic correction to the production and decay of that
state through the color-singlet quark-antiquark channel.


title: Recursive Approach to One-loop QCD Matrix Elements

abstract: We describe the recursive Approach to One-loop QCD Matrix Elements.


title:
Improved Naturalness with a Heavy Higgs: An Alternative Road to LHC
  Physics

abstract:
  The quadratic divergences of the Higgs mass may be cancelled either
accidentally or by the exchange of some new particles. Alternatively its impact
on naturalness may be weakened by raising the Higgs mass, which requires
changing the Standard Model below its natural cut-off. We show in detail how
this can be achieved, while preserving perturbativity and consistency with the
electroweak precision tests, by extending the Standard Model to include a
second Higgs doublet that has neither a vev nor couplings to quarks and
leptons. This Inert Doublet Model yields a perturbative and completely natural
description of electroweak physics at all energies up to 1.5 TeV. The discrete
symmetry that yields the Inert Doublet is unbroken, so that Dark Matter may be
composed of neutral inert Higgs bosons, which may have escaped detection at
LEP2. Predictions are given for multilepton events with missing transverse
energy at the Large Hadron Collider, and for the direct detection of dark
matter.


title:
Deviation from tri-bimaximal mixings in two types of inverted
  hierarchical neutrino mass models

abstract:
  An attempt is made to explore the possibility for deviations of solar mixing
angle ($\theta_{12}$) from tri-bimaximal mixings, without sacrificing the
predictions of maximal atmospheric mixing angle ($\theta_{23}=\pi/4$) and zero
reactor angle ($\theta_{13}=0$). We find that the above conjecture can be
automatically realised in the inverted hierarchical neutrino mass model having
2-3 symmetry, in the basis where charged lepton mass matrix is diagonal. For
the observed ranges of $\bigtriangleup m^2_{21}$ and $\bigtriangleup m^2_{23]$,
we calculate the predictions on $\tan^2\theta_{12}=0.5, 0.45, 0.35$ for
different input values of the parameters in the neutrino mass matrix. We also
observe a possible crossing over from one type of inverted hierarchical model
having same CP parity (Type-IHA) to other type having opposite CP parity
(Type-IHB). Such neutrino mass matrices can be obtained from the canonical
seesaw formula using diagonal form of Dirac neutrino mass matrix and
non-diagonal texture of right-handed Majorana mass matrix, and may have
important implications in model building using discrete as well as non-abelian
symmetry groups.


title: Large-Nc QCD and Pade Approximant Theory

abstract:
  In the large-Nc limit of QCD, the chiral expansion of the vacuum polarization
at low energies determines the whole function at any arbitrarily large (but
finite) energy. This result is an immediate consequence of the Theory of Pade
Approximants to Stieltjes functions.


title: Spin rotation of polarized beams in high energy storage ring

abstract:
  The equations for spin evolution of a particle in a storage ring are obtained
considering contributions from the tensor electric and magnetic
polarizabilities of the particle along with the contributions from spin
rotation and birefringence effect in polarized matter of an internal target. %
Study of the spin rotation and birefringence effects for a particle in a high
energy storage ring provides for measurement both the spin-dependent real part
of the coherent elastic zero-angle scattering amplitude and tensor electric
(magnetic) polarizabilities.


title:
Lepton flavor violating Z -> l_1^+ l_2^- decays with the localized new
  Higgs doublet in the extra dimension

abstract:
  We predict the branching ratios of Z-> e^{\pm} \mu^{\pm}, Z-> e^{\pm}
\tau^{\pm} and Z-> \mu^{\pm} \tau^{\pm} decays in the framework of the 2HDM
with the inclusion of one and two extra dimensions, by considering that the new
Higgs doublet is localized in the extra dimension with a Gaussian profile. We
observe that their BRs are at the order of the magnitude of $10^{-10}$,
$10^{-8}$ and $10^{-5}$ with the inclusion of a single extra dimension, in the
given range of the free parameters. These numerical values are slightly
suppressed in the case that the localization points of new Higgs scalars are
different than origin.


title:
String Junction Effects for Forward and Central Baryon Production in
  Hadron-Nucleus Collisions

abstract:
  The process of baryon number transfer due to string junction propagation in
rapidity space is considered. It leads to a significant effect in the net
baryon production in pA collisions at mid-rapidities and an even more
significant effect in the forward hemisphere for the cases of \pi A
interactions. The results of numerical calculations in the framework of the
Quark-Gluon String Model are in reasonable agreement with the data. Special
consideration is given to \Lambda produced in {\pi^-}-A collisions extracted
from data of WA89 Collaboration.


title: Predictions for double spin asymmetry A_{LT} in Semi Inclusive DIS

abstract:
  In the leading order of QCD parton model of Semi Inclusive Deep Inelastic
Scattering (SIDIS) the double spin asymmetry $A_{LT}$ arises due to the
longitudinal polarization of quarks in the transversely polarized nucleon. The
corresponding $k_T^2$ weighted distribution function $g^{(1)}_{1T}$ can be
related to ordinary helicity distribution $g_1(x)$ measured in DIS. Using
recent parameterizations for (un)polarized distribution and fragmentation
functions we calculated $A_{LT}$ asymmetry on transversely polarized proton and
deuteron targets for different types hadron production. The predictions are
given for COMPASS, HERMES and JLab energies. The role of Lorentz invariance
relations and positivity constraints are discussed.


title: Relating RHIC and SPS Heavy Ion Data

abstract:
  We have demonstrated recently that RHIC heavy ion data concerning particle
production at small and intermediate transverse momenta become very
transparent, if one realizes that there are two sources of particles
production: the corona -- due to the interactions of the peripheral nucleons of
either nucleus, and the core -- representing the high density central zone. We
extend our analysis to SPS heavy ion data. Again, we find that the nontrivial
centrality dependence of particle production (being stronger than at RHIC) is
simply due to an increasing corona contribution with decreasing centrality. The
core contribution shows no centrality dependence (concerning particle ratios),
and can be described in exactly the same way as at RHIC, with one exception:
there is somewhat less collective radial flow at SPS compared to RHIC. Apart of
this (and a trivial volume effect), the core portions produced in different
colliding systems at different energies (RHIC, SPS) look the same.


title: Constituent Quark Masses and the Electroweak Standard Model

abstract:
  Constituent quark masses can be determined quite well from experimental data
in several ways and one can obtain fairly accurate values for all six $m_q$.
The strong quark-meson coupling $g=2\pi /\sqrt{3}$ arises from the quark-level
linear $\sigma$ model, whereas $e$ and $\sin\theta_w$ arise from weak
interactions when the heavy $M_W$ and $M_Z$ are regarded as resonances in
analogy with the strong KSFR relation. The Higgs boson mass, tied to null
expectation value of charged Higgs components, is found to be around 317 GeV.
Finally, the experimental CPV phase angle $\delta$ and the three CKM angles
$\Theta_c, \Theta_2, \Theta_3$ are successfully deduced from the 6 constituent
quark masses following Fritzsch's approach.


title:
Mixed Higgsino Dark Matter from a Reduced SU(3) Gaugino Mass:
  Consequences for Dark Matter and Collider Searches

abstract:
  In gravity-mediated SUSY breaking models with non-universal gaugino masses,
lowering the SU(3) gaugino mass |M_3| leads to a reduction in the squark and
gluino masses. Lower third generation squark masses, in turn, diminish the
effect of a large top quark Yukawa coupling in the running of the higgs mass
parameter m_{H_u}^2, leading to a reduction in the magnitude of the
superpotential mu parameter (relative to M_1 and M_2). A low | mu | parameter
gives rise to mixed higgsino dark matter (MHDM), which can efficiently
annihilate in the early universe to give a dark matter relic density in accord
with WMAP measurements. We explore the phenomenology of the low |M_3| scenario,
and find for the case of MHDM increased rates for direct and indirect detection
of neutralino dark matter relative to the mSUGRA model. The sparticle mass
spectrum is characterized by relatively light gluinos, frequently with
m(gl)<<m(sq). If scalar masses are large, then gluinos can be very light, with
gl->Z_i+g loop decays dominating the gluino branching fraction. Top squarks can
be much lighter than sbottom and first/second generation squarks. The presence
of low mass higgsino-like charginos and neutralinos is expected at the CERN
LHC. The small m(Z2)-m(Z1) mass gap should give rise to a visible
opposite-sign/same flavor dilepton mass edge. At a TeV scale linear e^+e^-
collider, the region of MHDM will mean that the entire spectrum of charginos
and neutralinos are amongst the lightest sparticles, and are most likely to be
produced at observable rates, allowing for a complete reconstruction of the
gaugino-higgsino sector.


title:
Higher Fock State Contributions to the Generalized Parton Distribution
  of Pion

abstract:
  We discuss the higher Fock state (q \bar q g) contributions to the nonzero
value of the pion GPD at the crossover point x = zeta between the DGLAP and
ERBL regions. Using the phenomenological light-front constituent quark model,
we confirm that the higher Fock state contributions indeed give a nonzero value
of the GPD at the crossover point. Iterating the light-front quark model wave
function of the lowest q \bar q Fock state with the Bethe-Salpeter kernel
corresponding to the one-gluon-exchange, we include all possible time-ordered q
\bar q g Fock state contributions and obtain the pion GPD satisfying necessary
sum rules and continuity conditions.


title: New signals in pair production of heavy Q=2/3 singlets at LHC

abstract:
  New quark singlets T can be produced in pairs at LHC through standard QCD
interactions, with a large cross section for masses of several hundreds of GeV.
Their charged current decays T Tbar T -> W+ b W- bbar, with semileptonic decay
of the W pair, give a final state l nu bb jj$, as in top pair production. The
mixed decay modes T Tbar -> W+ b H tbar, H t W- bbar -> W+ b W- bbar H, T Tbar
-> W+ b Z tbar, Z t W- bbar -> W+ b W- bbar Z, with H,Z -> jj, yield two more
jets, l nu bb jjjj, or the same state in the latter case for Z -> nu nubar. We
extend previous work examining in detail the extra H and Z contributions and
stressing one of the salient features of the T Tbar -> W+ b W- bbar signal: the
presence of a very energetic charged lepton. We finally compare with the
discovery potential in l nu bbbb jj final states, with four b tags.


title: Light Higgs boson discovery from fermion mixing

abstract:
  We evaluate the LHC discovery potential for a light Higgs boson in t tbar H
(-> l nu b bbar b bbar jj) production, within the Standard Model and if a new
Q=2/3 quark singlet T with a moderate mass exists. In the latter case, T pair
production with decays T Tbar -> W+ b H tbar / H t W- bbar -> W+ b W- bbar H
provides an important additional source of Higgs bosons giving the same
experimental signature, and other decay modes T Tbar -> H t H tbar -> W+ b W-
bbar H H, T Tbar -> Z t H tbar / H t Z tbar -> W+ b W- bbar H Z further enhance
this signal. Both analyses are carried out with particle-level simulations of
signals and backgrounds, including t tbar plus n=0...5 jets which constitute
the main background by far. Our estimate for SM Higgs discovery in t tbar H
production, 0.4 sigma significance for M_H = 115 GeV and an integrated
luminosity of 30 fb^-1, is similar to the most recent ones by CMS which also
include the full t tbar nj background. We show that, if a quark singlet with a
mass m_T = 500 GeV exists, the luminosity required for Higgs discovery in this
final state is reduced by more than two orders of magnitude, and 5 sigma
significance can be achieved already with 8 fb^-1. This new Higgs signal will
not be seen unless we look for it: with this aim, a new specific final state
reconstruction method is presented. Finally, we consider the sensitivity to
search for Q=2/3 singlets. The combination of these three decay modes allows to
discover a 500 GeV quark with 7 fb^-1 of luminosity.


title:
The top quark to electron mass ratio m(t) = 18*m(e)/alpha^2 where alpha
  = e^2/hslash*c

abstract:
  Threshold-state elementary particle lifetimes exhibit a scaling in powers of
alpha = e^2/hslash*c, and a reciprocal electron-based 1/alpha scaling in
particle masses that extends over two powers of 1/alpha. The m(e)/alpha
coupling generates accurate q = (u,d), s, c, b quark masses for particles up to
11 GeV. The m(e)/alpha^2 coupling creates the "alpha-quarks" q^alpha = q/alpha
that reproduce the top quark mass and average W^+-, Z^0 doublet mass. The
calculated Bc mass is 6303.3 MeV/c^2, and the lattice QCD value is 6304 +- 12
MeV/c^2. The calculated and experimental top quark masses are m(t)calc =
18*m(e)/alpha^2 = 172.73 GeV/c^2 and m(t)exp = 172.5 +- 2.3 GeV/c^2.


title: K^L_{mu3} decay: A Stringent Test of Right-Handed Quark Currents

abstract:
  Clean tests of a small admixture of right-handed quark currents directly
coupled to the standard W are still lacking. We show that such non-standard
couplings can be significantly constrained measuring the value of the scalar
Kpi form factor at the Callan-Treiman point to a few percent. A realistic
prospect of such a measurement in K^L_{mu3} decay based on an accurate
dispersive representation of the scalar form factor is presented. The
inadequacy of the currently used linear parametrisation is explained and
illustrated using recent KTeV data. We briefly comment on the charged Kaon
mode.


title: A D-brane inspired Trinification model

abstract:
  We describe the basic features of model building in the context of
intersecting D-branes. As an example, a D-brane inspired construction with
U(3)_C X U(3)_L X U(3)_R gauge symmetry is proposed -which is the analogue of
the Trinification model- where the unification porperties and some low energy
implications on the fermion masses are analysed


title: The effect of supersymmetry breaking in the Mass Varying Neutrinos

abstract:
  We discuss the effect of the supersymmetry breaking on the Mass Varying
Neutrinos(MaVaNs) scenario. Especially, the effect mediated by the
gravitational interaction between the hidden sector and the dark energy sector
is studied. A model including a chiral superfield in the dark sector and the
right handed neutrino superfield is proposed. Evolutions of the neutrino mass
and the equation of state parameter are presented in the model. It is remarked
that only the mass of a sterile neutrino is variable in the case of the
vanishing mixing between the left-handed and a sterile neutrino on cosmological
time scale. The finite mixing makes the mass of the left-handed neutrino
variable.


title: Towards a consistent estimate of the chiral low-energy constants

abstract:
  Guided by the large-Nc limit of QCD, we construct the most general chiral
resonance Lagrangian that can generate chiral low-energy constants up to
O(p^6). By integrating out the resonance fields, the low-energy constants are
parametrized in terms of resonance masses and couplings. Information on those
couplings and on the low-energy constants can be extracted by analysing QCD
Green functions of currents both for large and small momenta. The chiral
resonance theory generates Green functions that interpolate between QCD and
chiral perturbation theory. As specific examples we consider the VAP and SPP
Green functions.


title:
A Supersymmetric Contribution to the Neutrino Mass Matrix and Breaking
  of mu-tau Symmetry

abstract:
  Supersymmetry broken by anomaly mediation suffers from tachyonic slepton
masses. A possible solution to this problem results in "decoupling", i.e., the
first two generations of sfermions are much heavier than the third one. We note
that in this scenario a sizable loop-induced contribution to the neutrino mass
matrix results. As an application of this scenario we take advantage of the
fact that the decoupling evidently not obeys 2-3 generation exchange symmetry.
In the neutrino sector, this 2-3 symmetry (or mu-tau symmetry) is a useful
Ansatz to generate zero theta_{13} and maximal theta_{23}. The induced
deviations from these values are given for some examples, thereby linking SUSY
breaking to the small parameters (including possibly the solar mass splitting)
of the neutrino sector.


title: X(3872) in lattice QCD with exact chiral symmetry

abstract:
  We investigate the mass spectrum of $ 1^{++} $ exotic mesons with quark
content $ (\c\q\cbar\qbar) $, using molecular and diquark-antidiquark
operators, in quenched lattice QCD with exact chiral symmetry. For the
molecular operator $ \{(\qbar\gamma_i\c)(\cbar\gamma_5\q)-
(\cbar\gamma_i\q)(\qbar\gamma_5\c) \} $ and the diquark-antidiquark operator $
\{(\q^T C \gi \c)(\qbar C \gamma_5 \cbar^T)-(\qbar C \gi^T \cbar^T)(\q^T C
\gamma_5 \c) \} $, both detect a resonance with mass around $ 3890 \pm 30 $ MeV
in the limit $ m_q \to m_u $, which is naturally identified with $ X(3872) $.
Further, heavier exotic meson resonance with $ J^{PC} = 1^{++} $ is also
detected, with quark content $ (\c\s\cbar\sbar) $ around $ 4100 \pm 50 $ MeV.


title:
Parton Charge Symmetry Violation: Electromagnetic Effects and W
  Production Asymmetries

abstract:
  Recent phenomenological work has examined two different ways of including
charge symmetry violation in parton distribution functions. First, a global
phenomenological fit to high energy data has included charge symmetry breaking
terms, leading to limits on the magnitude of parton charge symmetry breaking.
In a second approach, two groups have included the coupling of partons to
photons in the QCD evolution equations. One possible experiment that could
search for isospin violation in parton distributions is a measurement of the
asymmetry in W production at a collider. In this work we include both of the
postulated sources of parton charge symmetry violation. We show that, given
charge symmetry violation of a magnitude consistent with existing high energy
data, the expected W production asymmetries would be quite small, generally
less than one percent.


title: Determination of Spin and CP of the Higgs Boson from WBF

abstract:
  We explore the possibilities to determine the spin/CP properties of the Higgs
boson at the LHC. To cover the mass region below the ZZ threshold we make use
of the properties of the production in Weak Boson Fusion (WBF) and the decay
chain H -> WW -> l nu l nu. In particular, we study the angular correlations of
the forward jets and the distribution of the invariant mass of the lepton pair
for different hypothetical Higgs like particles.


title: A Quintessentially Geometric Model

abstract:
  We consider string inspired cosmology on a solitary $D3$-brane moving in the
background of a ring of branes located on a circle of radius $R$. The motion of
the $D3$-brane transverse to the plane of the ring gives rise to a radion field
which can be mapped to a massive non-BPS Born-Infeld type field with a cosh
potential. For certain bounds of the brane tension we find an inflationary
phase is possible, with the string scale relatively close to the Planck scale.
The relevant perturbations and spectral indices are all well within the
expected observational bounds. The evolution of the universe eventually comes
to be dominated by dark energy, which we show is a late time attractor of the
model. However we also find that the equation of state is time dependent, and
will lead to late time Quintessence.


title:
A New Technique for the Direct Measurement of the Electron Anti-Neutrino
  Mass

abstract:
  Paper withdrawn because of unjustified approximation between equations 13 and
14.


title:
All orders Boltzmann collision term from the multiple scattering
  expansion of the self-energy

abstract:
  Starting from the Kadanoff-Baym relativistic transport equation and the
multiple scattering expansion of the self-energy, we obtain the Boltzmann
collision terms for any number of participating particles to all orders in
perturbation theory within a quasi-particle approximation. This work completes
a program initiated by Carrington and Mrowczynski and developed further by
present authors and Weinstock in recent literature.


title:
Determination of polarized parton distribution functions with recent
  data on polarization asymmetries

abstract:
  Global analysis has been performed within the next-to-leading order in
Quantum Chromodynamics (QCD) to determine polarized parton distributions with
new experimental data in spin asymmetries. The new data set includes JLab,
HERMES, and COMPASS measurements on spin asymmetry A_1 for the neutron and
deuteron in lepton scattering. Our new analysis also utilizes the double-spin
asymmetry for pi^0 production in polarized pp collisions, A_{LL}^{pi^0},
measured by the PHENIX collaboration. Because of these new data, uncertainties
of the polarized PDFs are reduced. In particular, the JLab, HERMES, and COMPASS
measurements are valuable for determining Delta d_v(x) at large x and Delta
qbar(x) at x~0.1. The PHENIX pi^0 data significantly reduce the uncertainty of
Delta g(x). Furthermore, we discuss a possible constraint on Delta g(x) at
large x by using the HERMES data on g_1^d in comparison with the COMPASS ones
at x~0.05.


title: Hadronic B Decays: A General Approach

abstract:
  In this paper, we propose a general approach for describing hadronic B
decays. Using this method, all amplitudes for such decays can be expressed in
terms of contractions, though the matrix elements are not evaluated. Many years
ago, Buras and Silvestrini proposed a similar approach. However, our technique
goes beyond theirs in several ways. First, we include recent theoretical and
experimental developments which indicate which contractions are negligible, and
which are expected to be smaller than others. Second, we show that all B-decay
diagrams can be simply expressed in terms of contractions. This constitutes a
formal proof that the diagrammatic method is rigourous. Third, we show that one
reproduces the relations between tree and electroweak-penguin diagrams
described by Neubert and Rosner, and by Gronau, Pirjol and Yan. Fourth,
although the previous results hold to all orders in alpha_s, we show that it is
also possible to work order-by-order in this approach. In this way it is
possible to make a connection with the matrix-element evaluation methods of QCD
factorization (QCDfac) and perturbative QCD (pQCD). Finally, using the
contractions approach, we re-evaluate the question of whether there is a ``B ->
pi K puzzle.'' At O(alpha_s^0), we find that the diagram ratio |C'/T| is about
0.17, a factor of 10 too small to explain all the B -> pi K data. Both QCDfac
and pQCD find that, at O(\alpha_s^1), the value of |C'/T'| may be raised to
only about 2-3 times its lowest-order value. We therefore conclude that,
assuming the effect is not a statistical fluctuation, it is likely that the
value of |C'/T'| is similar to its O(\alpha_s^0) result, and that there really
is a B -> pi K puzzle.


title: V_us From Hadronin Tau Decays

abstract:
  We study the reliability of extractions of |V_{us}| based on flavor-breaking
hadronic tau decay sum rules. The ``(0,0) spectral weight'', proposed
previously as a favorable candidate for this extraction, is shown to produce
results having poor stability with respect to s_0, the upper limit on the
relevant spectral integral, suggesting theoretical errors much larger than
previously anticipated. We argue that this instability is due to the poor
convergence of the integrated D=2 OPE series. Alternate weight choices designed
to bring this convergence under better control are shown to produce
significantly improved stability, and determinations of |V_{us}| which are both
mutually compatible, and consistent, within errors, with values obtained by
other methods.


title:
Characterizing the Larkin-Ovchinnikov-Fulde-Ferrel phase induced by the
  chromomagnetic instability

abstract:
  We discuss possible destinations from the chromomagnetic instability in color
superconductors with Fermi surface mismatch $\delta\mu$. In the two-flavor
superconducting (2SC) phase we calculate the effective potential for color
vector potentials $A_\alpha$ which are interpreted as the net momenta $q$ of
pairing in the Larkin-Ovchinnikov-Fulde-Ferrel (LOFF) phase. When
$1/\sqrt{2}<\delta\mu/\Delta<1$ where $\Delta$ is the gap energy, the effective
potential suggests that the instability leads to a LOFF-like state which is
characterized by color-rotated phase oscillations with small $q$. In the
vicinity of $\delta\mu/\Delta=1/\sqrt{2}$ the magnitude of $q$ continuously
increases from zero as the effective potential has negative larger curvature at
vanishing $A_\alpha$ that is the Meissner mass squared. In the gapless 2SC
(g2SC) phase, in contrast, the effective potential has a minimum at
$gA_\alpha\sim\delta\mu\sim\Delta$ even when the negative Meissner mass squared
is infinitesimally small. Our results imply that the chromomagnetic instability
found in the gapless phase drives the system toward the LOFF state with
$q\sim\delta\mu$.


title: Fermion Confinement in Brane World Models with SO(10) Unification

abstract:
  In this Honours Research Project the aim is to build a toy model of an SO(10)
Grand Unified Theory with an extra spatial dimension. Utilising the Clash of
Symmetries mechanism proposed for brane-world models by Davidson, Toner, Volkas
and Wali and using the asymmetric kink solution for the Higgs Field in the 45
of SO(10) discovered by Shin and Volkas, the symmetry on the brane will be
broken to SU(4) x SU(2) x U(1), whereas the symmetry in the bulk is G_SM x
U(1). However, any fermions localised on the brane would experience slight
leakage into the bulk, and hence the symmetry is broken down to G_SM x U(1). We
then introduce different SO(10) representations for fermions into the theory
and determine which components become localised as chiral zero-modes, in the
hope that the Standard Model particles are confined. Various group theoretical
techniques are introduced as we study the 120, 16, 126 and 144 representations,
and detailed analysis of the 16's confinement characteristics is performed.


title:
Using Phenomenological Formulae,Deducing the Masses and Flavors of the
  Quarks, Baryons and Mesons from Two Elementary Quarks

abstract:
  Using phenomenological formulae, we deduce the masses and quantum numbers of
the quarks from two elementary quarks ($\epsilon_{u}$ and $\epsilon_{d}$)
first. Then using the sum laws and a binding energy formula, in terms of the
qqq baryon model and SU(4), we deduce the masses and quantum numbers of the
important baryons from the deduced quarks. At the same time, using the sum laws
and a binding energy formula, in terms of the quark-antiquark bound state meson
model, we deduce the masses and quantum numbers of the mesons from the deduced
quarks. The deduced masses of the baryons and mesons are 98% consistent with
experimental results. The deduced quantum numbers of the baryons and mesons
match with the experimental results exactly. In fact this paper improves upon
the Quark Model, making it more powerful and more reasonable. It predicts some
baryonsalso. PACS: 12.39.-x; 14.65.-q; 14.20.-c keywords: phenomenology,
elementary, quark, mass, SU(4), baryon, meson


title:
Universality of strength for Yukawa couplings with extra down-type quark
  singlets

abstract:
  We investigate the quark masses and mixings by including vector-like
down-type quark singlets in universality of strength for Yukawa couplings
(USY). In contrast with the standard model with USY, the sufficient $ CP $
violation is obtained for the Cabibbo-Kobayashi-Maskawa matrix through the
mixing between the ordinary quarks and quark singlets. The top-bottom mass
hierarchy $ m_t \gg m_b $ also appears naturally in the USY scheme with the
down-type quark singlets.


title: Large next-to-leading order QCD corrections to pentaquark sum rules

abstract:
  Using configuration space techniques, we calculate next-to-leading order
(NLO) five-loop QCD corrections to the correlators of interpolating pentaquark
currents in the limit of massless quarks. We obtain very large NLO corrections
to the spectral density which makes a standard sum rule analysis problematic.
However, the NLO corrections to the correlator in configuration space are
reasonable. We discuss the implications of our results for the phenomenological
sum rule analysis of pentaquark states.


title: Generalized z-scaling in proton-proton collisions at high energies

abstract:
  New generalization of z-scaling in inclusive particle production is proposed.
The scaling variable z is fractal measure which depends on kinematical
characteristics of the underlying sub-process expressed in terms of the
momentum fractions x1 and x2 of the incoming protons. In the generalized
approach, the x1 and x2 are functions of the momentum fractions ya and yb of
the scattered and recoil constituents carried out by the inclusive particle and
recoil object, respectively. The scaling function psi(z) for charged and
identified hadrons produced in proton-proton collisions is constructed. The
fractal dimensions and heat capacity of the produced medium entering definition
of the z are established to obtain energy, angular and multiplicity
independence of the psi(z). The scheme allows unique description of data on
inclusive cross sections of charged particles, pions, kaons, antiprotons and
lambdas at high energies. The obtained results are of interest to use z-scaling
as a tool for searching for new physics phenomena of particle production in
high transverse momentum and high multiplicity region at proton-proton
colliders RHIC and LHC.


title: Unitary coupled channel analysis of the $\Lambda(1520)$ resonance

abstract:
  We study the $\Lambda(1520)$ resonance in a coupled channel approach
involving the $\pi\Sigma(1385)$, $K\Xi(1530)$, $\bar{K}N$ and $\pi\Sigma$
channels. Implementing unitarity in coupled channels, we make an analysis of
the relative importance of the different mechanisms which contribute to the
dynamical structure of this resonance. From experimental information on some
partial wave amplitudes and constraints imposed by unitarity, we get a
comprehensive description of the amplitudes and hence the couplings to the
different channels. We test these amplitudes in different reactions like
$K^-p\to\Lambda\pi\pi$, $\gamma p\to K^+K^-p$, $\gamma p\to
K^+\pi^0\pi^0\Lambda$ and $\pi^- p\to K^0 K^-p$ and find a fair agreement with
the experimental data.


title: A Theory Perspective on Neutrino Oscillations

abstract:
  I summarize the status of neutrino oscillations that follow from current
data, including the status of the small parameters ratio of
solar-over-atmospheric splitting and $\sin^2\theta_{13}$ characterizing the
strength of CP violation in neutrino oscillations. I briefly discuss the impact
of oscillation data on the prospects for probing the absolute scale of neutrino
mass in neutrinoless double beta decay. I also comment on the theoretical
origin of neutrino mass, mentioning recent attemps to explain current data from
first principles.


title:
Subthreshold rho contribution in J/psi decay to omega pion pion and Kaon
  anti-Kaon pion

abstract:
  We carry out a theoretical and Monte Carlo study on the $J/\psi$ decays into
$\omega\pi\pi$ and $K\bar{K}\pi$ through intermediate subthreshold $\rho$ meson
by using SU(3)-symmetric Lagrangian approach. It is found that the subthreshold
$\rho$ contribution is not negligible and may have significant influence on
partial wave analysis of resonances in these channels, especially near the
$\omega \pi$ and $K \bar{K}$ thresholds.


title: Neutrino masses in the Lepton Number Violating MSSM

abstract:
  We consider the most general supersymmetric model with minimal particle
content and an additional discrete Z_3 symmetry (instead of R-parity), which
allows lepton number violating terms and results in non-zero Majorana neutrino
masses. We investigate whether the currently measured values for lepton masses
and mixing can be reproduced. We set up a framework in which Lagrangian
parameters can be initialised without recourse to assumptions concerning
trilinear or bilinear superpotential terms, CP-conservation or
intergenerational mixing and analyse in detail the one loop corrections to the
neutrino masses. We present scenarios in which the experimental data are
reproduced and show the effect varying lepton number violating couplings has on
the predicted atmospheric and solar mass^2 differences. We find that with
bilinear lepton number violating couplings in the superpotential of the order 1
MeV the atmospheric mass scale can be reproduced. Certain trilinear
superpotential couplings, usually, of the order of the electron Yukawa coupling
can give rise to either atmospheric or solar mass scales and bilinear
supersymmetry breaking terms of the order 0.1 GeV^2 can set the solar mass
scale. Further details of our calculation, Lagrangian, Feynman rules and
relevant generic loop diagrams, are presented in three Appendices.


title: Chiral Corrections to the Hyperon Vector Form Factors

abstract:
  We present the complete calculation of the SU(3)-breaking corrections to the
hyperon vector form factors up to O(p^4) in the Heavy Baryon Chiral
Perturbation Theory. Because of the Ademollo-Gatto theorem, at this order the
results do not depend on unknown low energy constants and allow to test the
convergence of the chiral expansion. We complete and correct previous
calculations and find that O(p^3) and O(1/M_0) corrections are important. We
also study the inclusion of the decuplet degrees of freedom, showing that in
this case the perturbative expansion is jeopardized. These results raise doubts
on the reliability of the chiral expansion for hyperons.


title: Hypergeometric representation of the two-loop equal mass sunrise diagram

abstract:
  A recurrence relation between equal mass two-loop sunrise diagrams differing
in dimensionality by 2 is derived and it's solution in terms of Gauss' 2F1 and
Appell's F_2 hypergeometric functions is presented. For arbitrary space-time
dimension d the imaginary part of the diagram on the cut is found to be the 2F1
hypergeometric function with argument proportional to the maximum of the Kibble
cubic form. The analytic expression for the threshold value of the diagram in
terms of the hypergeometric function 3F2 of argument -1/3 is given.


title:
Renormalization effects on neutrino masses and mixing in a
  string-inspired SU(4) X SU(2)_L X SU(2)_R X U(1)_X model

abstract:
  We discuss renormalization effects on neutrino masses and mixing angles in a
supersymmetric string-inspired SU(4) X SU(2)_L X SU(2)_R X U(1)_X model, with
matter in fundamental and antisymmetric tensor representations and singlet
Higgs fields charged under the anomalous U(1)_X family symmetry. The quark,
lepton and neutrino Yukawa matrices are distinguished by different
Clebsch-Gordan coefficients. The presence of a second U(1)_X breaking singlet
with fractional charge allows a more realistic, hierarchical light neutrino
mass spectrum with bi-large mixing. By numerical investigation we find a region
in the model parameter space where the neutrino mass-squared differences and
mixing angles at low energy are consistent with experimental data.


title: Improved Higgs Naturalness With or Without Supersymmetry

abstract:
  Many models of electroweak symmetry-breaking with an extended Higgs sector
exhibit improved naturalness, wherein the new physics scale, at which quadratic
divergences of Higgs mass parameters due to top quark loops are cut off, can be
pushed beyond the reach of the Large Hadron Collider without unnatural fine
tuning. Such models include examples where the new physics is supersymmetry,
implying that supersymmetry may still solve the hierarchy problem, even if it
eludes detection at the LHC.


title:
Perturbative and Nonperturbative Contributions to a Simple Model for
  Baryogenesis

abstract:
  Single field baryogenesis, a scenario for Dirac leptogenesis sourced by a
time-dependent scalar condensate, is studied. We compare the creation of the
charge asymmetry by the perturbative decay of the condensate with the
nonperturbative decay, a process of particle production commonly known in the
context of inflation as preheating. The nonperturbative channel dominates when
the coupling of the scalar field to leptons is sufficiently large.


title: Improvement of the Theta+ width estimation method on the Light Cone

abstract:
  Recently, Diakonov and Petrov have suggested a formalism in the Relativistic
Mean Field Approximation allowing one to derive the 3-, 5-, 7-,... quark
wavefunctions for the octet, decuplet and antidecuplet. They have used this
formalism and many strong approximations in order to estimate the exotic Theta+
width. The latter has been estimated to ~4 MeV. Besides they obtained that the
5-quark component of the nucleon is about 50% of its 3-quark component meaning
that relativistic effects are not small. We have improved the technique by
taking into account some relativistic corrections and considering the
previously neglected 5-quark exchange diagrams. We also have computed all
nucleon axial charges. It turns out that exchange diagrams affect very little
Diakonov's and Petrov's results while relativistic corrections reduce the
Theta+ width to ~2 MeV and the 5- to 3-quark component of the nucleon ratio to
30%.


title: |V_td/V_ts| from B-> V gamma

abstract:
  The dominant theoretical uncertainty in extracting |V_td/V_ts| from the ratio
of branching ratios R=B(B->(rho,omega)gamma)/B(B->K* gamma) is given by the
ratio of form factors xi=T_1^{B->K*}(0)/T_1^{B->rho}(0). We re-examine xi in
the framework of QCD sum rules on the light-cone, taking into account hitherto
neglected SU(3)-breaking effects. We find xi=1.17 \pm 0.09. Using QCD
factorisation for the branching ratios, and the current experimental average
for R quoted by HFAG, this translates into |V_td/V_ts|^HFAG_{B->V gamma} =
0.192 \pm 0.014(th) \pm 0.016(exp). This result agrees, within errors, with
that obtained from the Standard Model unitarity triangle, |V_td/V_ts|_SM =
0.216 \pm 0.029, based on tree-level-only processes, and with
|V_td/V_ts|_{Delta m} = 0.2060^{+0.0081}_{-0.0060}(th) \pm 0.0007(exp), from
the CDF measurement of B_s oscillations.


title: Color-Superconducting Gap in the Presence of a Magnetic Field

abstract:
  We explore the effects of an external magnetic field in the structure and
magnitude of the diquark condensate in a three massless quark flavor color
superconductor. It is shown that the long-range component $\widetilde{B}$ of
the external magnetic field that penetrates the color-flavor locked (CFL) phase
modifies its gap structure, producing a new phase of lower symmetry. Our
analysis is performed within an NJL effective field theory with four-fermion
interactions, inspired by one-gluon exchange. Using Ritus' method, we compute
the quark propagators in the presence of a background magnetic field, and
derive the gap equations for arbitrary values of the field. An analytical
solution is found for strong magnetic fields. A main outcome of our study is
that the $\widetilde{B}$ field tends to strengthen the gaps that get
contributions from pairs of $\widetilde{Q}$-charged quarks. These gaps are
enhanced through the field-dependent density of states of the
$\widetilde{Q}$-charged quarks on the Fermi surface. Our considerations are
relevant for the study of highly magnetized compact stars.


title: A Send-off after Dif06: What Do We Need to Know to Understand More?

abstract:
  After a brief look back at the roles played by hadronic machines and $e^+e^-$
colliders I emphasize that continuing dedicated studies of heavy flavour
transitions should be central to our efforts of decoding nature's `Grand
Design'. For studies `instrumentalizing' the high sensitivity of \cp violation
will presumably be essential to identify salient features of the New Physics
anticipated for the TeV scale and hopefully discovered directly at the LHC. An
$e^+e^-$ Super-Flavour Factory would provide the optimal platform for such a
program.


title: Pion fluctuation in deep inelastic scattering

abstract:
  The forward neutron production in the ep collisions at 300 GeV measured by H1
and ZEUS Collaborations at DESY has been used to estimate the total probability
for proton fluctuation into n pi^+ and p pi^0. The probability found is on the
order of 30%. This number is compared with the numbers obtained for the
probability of quark fluctuation into pi^+ from several alternative DIS
processes (Gottfried sum rule, polarized structure function) and the
axial-vector coupling constant, where the pion fluctuation is believed to play
an important role.


title: NLO QCD method of the polarized SIDIS data analysis

abstract:
  Method of polarized semi-inclusive deep inelastic scattering (SIDIS) data
analysis in the next to leading order (NLO) QCD is developed. Within the method
one first directly extracts in NLO few first truncated (available to
measurement) Mellin moments of the quark helicity distributions. Second, using
these moments as an input to the proposed modification of the Jacobi polynomial
expansion method (MJEM), one eventually reconstructs the local quark helicity
distributions themselves. All numerical tests demonstrate that MJEM allows us
to reproduce with the high precision the input local distributions even inside
the narrow Bjorken $x$ region accessible for experiment. It is of importance
that only four first input moments are sufficient to achieve a good quality of
reconstruction. The application of the method to the simulated SIDIS data on
the pion production is considered. The obtained results encourage one that the
proposed NLO method can be successfully applied to the SIDIS data analysis. The
analysis of HERMES data on pion production is performed. To this end the pion
difference asymmetries are constructed from the measured by HERMES standard
semi-inclusive spin asymmetries. The LO results of the valence distribution
reconstruction are in a good accordance with the respective leading order SMC
and HERMES results, while the NLO results are in agreement with the existing
NLO parametrizations on these quantities.


title:
Two-loop Calculation of Higgs Mass in Gauge-Higgs Unification: 5D
  Massless QED Compactified on S^1

abstract:
  We calculate the quantum corrections to the mass of the zero mode of the
fifth component of the gauge field at two-loop level in a five dimensional
massless QED compactified on S^1. We discuss in detail how the divergences are
exactly canceled and the mass becomes finite. The key ingredients to obtain the
result are the five dimensional gauge invariance and the Ward-Takahashi
identity. We also evaluate the finite part of corrections.


title: Diffractive Higgs Production from Intrinsic Heavy Flavors in the Proton

abstract:
  We propose a novel mechanism for exclusive diffractive Higgs production $pp
\to p H p $ in which the Higgs boson carries a significant fraction of the
projectile proton momentum. This mechanism will provide a clear experimental
signal for Higgs production due to the small background in this kinematic
region. The key assumption underlying our analysis is the presence of intrinsic
heavy flavor components of the proton bound state, whose existence at high
light-cone momentum fraction $x$ has growing experimental and theoretical
support. We also discuss the implications of this picture for exclusive
diffractive quarkonium and other channels.


title:
Exploring B_{d,s}-> KK decays through flavour symmetries and
  QCD-factorisation

abstract:
  We present a new analysis of B_{d,s}->KK modes within the SM, relating them
in a controlled way through SU(3)-flavour symmetry and QCD-improved
factorisation. We propose a set of sum rules for B_{d,s}-> K^0{\bar K}^0
observables. We determine B_s-> KK branching ratios and CP-asymmetries as
functions of A_{dir}(B_d-> K^0{\bar K}^0), pointing out a conflict between
BR(B_s-> K+K-) in the SM and data. Finally, we predict the amount of U-spin
breaking between B_d-> pi+pi- and B_s-> K+K-.


title:
Comment on ``Parity Doubling and $SU(2)_L \times SU(2)_R$ Restoration in
  the Hadronic Spectrum''

abstract:
  This comment critically discusses certain aspects of a recent paper on parity
doubling in the hadronic spectrum and its possible connection to chiral
symmetry restoration.


title:
The e+ e- -> P1 P2 gamma processes close to the Phi peak: toward a
  model-independent analysis

abstract:
  We discuss the general decomposition and possible general parameterizations
of the processes $e^+ e^- \to \gamma^* \to P_1 P_2 \gamma$, where $P_1
P_2=\pi^0 \pi^0$, $\pi^0\eta$, or $\pi^+\pi^-$, for $\sqrt{s}\approx M_\Phi$.
Particular attention is devoted to the amplitude where the two pseudoscalar
mesons are in a $J^{CP}= 0^{++}$ state, where we propose a general
parameterization which should help to shed light on the nature of light scalar
mesons.


title: Higher Curvature Gravity in TeV-Scale Extra Dimensions

abstract:
  We begin a general exploration of the phenomenology of TeV-scale
extra-dimensional models with gravitational actions that contain higher
curvature terms. In particular, we examine how the classic collider signatures
of the models of Arkani-Hamed, Dimopoulos and Dvali (missing energy and new
dimension-8 contact interactions) and of Randall and Sundrum (TeV-scale
graviton Kaluza-Klein resonances) are altered by these modifications to the
usual Einstein-Hilbert action. We find that not only are the detailed
signatures for these gravitationally induced processes altered but new
contributions are found to arise due to the existence of additional scalar
Kaluza-Klein states in the spectrum.


title: A Model for Neutrino and Charged Lepton Masses in Extra Dimensions

abstract:
  We propose a model with one large submm size extra dimension in which the
gravity and right-handed (RH) neutrino propagate, but the three Standard Model
(SM) families are confined to fat branes of TeV^(-1) size or smaller. The
charged leptons and the light neutrinos receive mass from the five dimensional
Yukawa couplings with the SM singlet neutrino via electroweak Higgs, while the
KK excitations of the SM singlet neutrino gets large TeV scale masses from the
five dimensional Yukawa coupling with an electroweak singlet Higgs. The model
gives non-hierarchical light neutrino masses, accommodate hierarchical charged
lepton masses, and naturally explain why the light neutrino masses are so much
smaller compared to the charged lepton masses. Large neutrino mixing is
naturally expected in this scenario. The light neutrinos are Dirac particles in
this model, hence neutrinoless double beta decay is not allowed. The model has
also several interesting collider implications and can be tested at the LHC.


title: Reheating in supersymmetric high scale inflation

abstract:
  Motivated by Refs \cite{am1,am2}, we analyze how the inflaton decay reheats
the Universe within supersymmetry. In a non-supersymmetric case the inflaton
usually decays via preheating unless its couplings to other fields are very
small. Naively one would expect that supersymmetry enhances bosonic preheating
as it introduces new scalars such as squarks and sleptons. On the contrary, we
point out that preheating is unlikely within supersymmetry. The reason is that
flat directions in the scalar potential, classified by gauge invariant
combinations of slepton and squark fields, are generically displaced towards a
large vacuum expectation value (VEV) in the early Universe. They induce
supersymmetry preserving masses to the inflaton decay products through the
Standard Model Yukawa couplings, which kinematically blocks preheating for VEVs
$> 10^{13}$ GeV. The decay will become allowed only after the flat directions
start oscillating, and once the flat direction VEV is sufficiently redshifted.
For models with weak scale supersymmetry, this generically happens at a Hubble
expansion rate: $H \simeq (10^{-3}-10^{-1}) {\rm TeV}$, at which time the
inflaton decays in the perturbative regime. This is to our knowledge first
analysis where the inflaton decay to the Standard Model particles is treated
properly within supersymmetry. There are number of important consequences: no
overproduction of dangerous supersymmetric relics (particularly gravitinos), no
resonant excitation of superheavy dark matter, and no non-thermal leptogenesis
through non-perturbative creation of the right-handed (s)neutrinos. Finally
supersymmetric flat directions can even spoil hybrid inflation all together by
not allowing the auxiliary field become tachyonic.


title: New limits on "odderon" amplitudes from analyticity constraints

abstract:
  In studies of high energy $pp$ and $\bar pp$ scattering, the odd (under
crossing) forward scattering amplitude accounts for the difference between the
$pp$ and $\bar pp$ cross sections. Typically, it is taken as
$f_-=-\frac{p}{4\pi}Ds^{\alpha-1}e^{i\pi(1-\alpha)/2}$ ($\alpha\sim 0.5$),
which has $\Delta\sigma, \Delta\rho\to0$ as $s\to\infty$, where $\rho$ is the
ratio of the real to the imaginary portion of the forward scattering amplitude.
However, the odd-signatured amplitude can have in principle a strikingly
different behavior, ranging from having $\Delta\sigma\to$non-zero constant to
having $\Delta\sigma \to \ln s/s_0$ as $s\to\infty$, the maximal behavior
allowed by analyticity and the Froissart bound. We reanalyze high energy $pp$
and $\bar pp$ scattering data, using new analyticity constraints, in order to
put new and precise limits on the magnitude of ``odderon'' amplitudes.


title: Baryogenesis, Electric Dipole Moments and Dark Matter in the MSSM

abstract:
  We study the implications for electroweak baryogenesis (EWB) within the
minimal supersymmetric Standard Model (MSSM) of present and future searches for
the permanent electric dipole moment (EDM) of the electron, for neutralino dark
matter, and for supersymmetric particles at high energy colliders. We show that
there exist regions of the MSSM parameter space that are consistent with both
present two-loop EDM limits and the relic density and that allow for successful
EWB through resonant chargino and neutralino processes at the electroweak phase
transition. We also show that under certain conditions the lightest neutralino
may be simultaneously responsible for both the baryon asymmetry and relic
density. We give present constraints on chargino/neutralino-induced EWB implied
by the flux of energetic neutrinos from the Sun, the prospective constraints
from future neutrino telescopes and ton-sized direct detection experiments, and
the possible signatures at the Large Hadron Collider and International Linear
Collider.


title: Higgs Sector in Extensions of the MSSM

abstract:
  Extensions of the Minimal Supersymmetric Standard Model (MSSM) with
additional singlet scalar fields solve the important mu-parameter fine tuning
problem of the MSSM. We compute and compare the neutral Higgs boson mass
spectra, including one-loop corrections, of the following MSSM extensions:
Next-to-Minimal Supersymmetric Standard Model (NMSSM), the nearly-Minimal
Supersymmetric Standard Model (nMSSM), and the U(1)'-extended Minimal
Supersymmetric Standard Model (UMSSM) by performing scans over model
parameters. We find that the Secluded U(1)'-extended Minimal Supersymmetric
Standard Model (sMSSM) is identical to the nMSSM if three of the additional
scalars decouple. The dominant part of the one-loop corrections are
model-independent since the singlet field does not couple to MSSM particles
other than the Higgs doublets. Thus, model-dependent parameters enter the
masses only at tree-level. We apply constraints from LEP bounds on the Standard
Model and MSSM Higgs boson masses and the MSSM chargino mass, the invisible Z
decay width, and the Z-Z' mixing angle. Some extended models permit a Higgs
boson with mass substantially below the SM LEP limit or above theoretical
limits in the MSSM. Ways to differentiate the models via masses, couplings,
decays and production of the Higgs bosons are discussed.


title: Implications of Holographic QCD in ChPT with Hidden Local Symmetry

abstract:
  Based on the chiral perturbation theory (ChPT) with the hidden local
symmetry, we propose a methodology to calculate the large $N_c$ corrections in
the holographic QCD (HQCD). As an example, we apply the method to an HQCD model
recently proposed by Sakai and Sugimoto. We show that the $\rho$-$\pi$-$\pi$
coupling becomes in good agreement with the experiment due to the
$1/N_c$-subleading corrections.


title: Improving the Infra-red of Holographic Descriptions of QCD

abstract:
  A surprisingly good holographic description of QCD can be obtained from naive
five dimensional gauge theory on a truncated AdS space. We seek to improve the
infra-red description of QCD in such models by using a more sophisticated
metric and an action derived from string theory duals of chiral symmetry
breaking. Our metric is smooth into the infra-red and the chiral condensate is
a prediction of the dynamics. The theory reproduces QCD meson data at the 10%
level.


title: Rescattering effects and the $\sigma$ pole in hadronic decays

abstract:
  The $\sigma$ resonance was observed as a conspicuous $\pi^+\pi^-$ peak in
hadronic decays like $J/\psi\to \pi^+\pi^-\omega$ or $D^+\to\pi^+\pi^-\pi^+$.
The phase of the $\sigma\to\pi^+\pi^-$ amplitude, extracted from production
data within the conventional isobar model, is assumed to coincide with that in
$\pi\pi$ elastic scattering. We check the validity of this assumption by using
Lehmann-Symanzik-Zimmermann (LSZ) reduction and unitarity. The rescattering
effects in the final three-particle states are shown to generate a correction
to the phase given by a naive application of Watson theorem. We briefly discuss
the implications of this result for the pole determination from production
data.


title:
Constraint on Right-Handed Squark Mixings from B_s - B_sbar Mass
  Difference

abstract:
  We point out that the right-handed squark mixings can sizably enhance SUSY
contributions to Delta M_s by taking into account renormalization group effects
via the CKM matrix. The recent result of Delta M_s from the D0 experiment at
the Tevatron thus implies a strong constraint on the right-handed mixings.


title:
Two-flavor QCD phases and condensates at finite isospin chemical
  potential

abstract:
  We study the phase structure and condensates of two-flavor QCD at finite
isospin chemical potential in the framework of a confining, Dyson-Schwinger
equation model. We find that the pion superfluidity phase is favored at high
enough isospin chemical potential. A new gauge invariant mixed quark-gluon
condensate induced by isospin chemical potential is proposed based on Operator
Product Expansion. We investigate the sign and magnitude of this new condensate
and show that it's an important condensate in QCD sum rules at finite isospin
density.


title: Rapidity-dependence of jet shape broadening and quenching

abstract:
  The jet shape modification due to partonic energy loss in the dense QCD
matter is investigated by the help of the special transverse energy-energy
correlator in the vicinity of maximum energy deposition of every event. In the
accepted scenario with scattering of jet hard partons off comoving medium
constituents this correlator is independent of the pseudorapidity position of a
jet axis and becomes considerably broader (symmetrically over the
pseudorapidity and the azimuthal angle) in comparison with $pp$-collisions. At
scattering off "slow" medium constituents the broadening of correlation
functions is dependent on the pseudorapidity position of a jet axis and
increases noticeably in comparison with the previous scenario for jets with
large enough pseudorapidities. These two considered scenarios result also in
the different dependence of jet quenching on the pseudorapidity.


title: Negative Pressures in QED Vacuum in an External Magnetic Field

abstract:
  Our aim is to study the electron-positron vacuum pressures in presence of a
strong magnetic field $B$. To that end, we obtain a general energy-momentum
tensor, depending on external parameters, which in the zero temperature and
zero density limit leads to vacuum expressions which are
approximation-independent. Anisotropic pressures arise, and in the tree
approximation of the magnetic field case, the pressure along $B$ is positive,
whereas perpendicular to $B$ it is negative. Due to the common axial symmetry,
the formal analogy with the Casimir effect is discussed, for which in addition
to the usual negative pressure perpendicular to the plates, there is a positive
pressure along the plates. The formal correspondence between the Casimir and
black body energy-momentum tensors is analyzed. The fermion hot vacuum behavior
in a magnetic field is also briefly discussed.


title: Identifying the curvaton within MSSM

abstract:
  We consider inflaton couplings to MSSM flat directions and the thermalization
of the inflaton decay products, taking into account gauge symmetry breaking due
to flat direction condensates. We then search for a suitable curvaton candidate
among the flat directions, requiring an early thermally induced start for the
flat direction oscillations to facilitate the necessary curvaton energy density
dominance. We demonstrate that the supersymmetry breaking $A$-term is crucial
for achieving a successful curvaton scenario. Among the many possible
candidates, we identify the ${\bf u_1dd}$ flat direction as a viable MSSM
curvaton.


title: Susceptibilities near the QCD (tri)critical point

abstract:
  Based on the proper-time renormalization group approach, the scalar and the
quark number susceptibilities in the vicinity of possible critical end points
of the hadronic phase diagram are investigated in the two-flavor quark-meson
model. After discussing the quark-mass dependence of the location of such
points, the critical behavior of the in-medium meson masses and quark number
density are calculated. The universality classes of the end points are
determined by calculating the critical exponents of the susceptibilities. In
order to numerically estimate the influence of fluctuations we compare all
quantities with results from a mean-field approximation. It is concluded that
the region in the phase diagram where the susceptibilities are enhanced is more
compressed around the critical end point if fluctuations are included.