title: Minimal Modification To The Tri-bimaximal Neutrino Mixing

abstract:
  Current experimental data on neutrino oscillations are consistent with the
tri-bimaximal mixing. If future experimental data will determine a non-zero
$V_{e3}$ and/or find CP violations in neutrino oscillations, there is the need
to modify the mixing pattern. We find that a simple neutrino mass matrix,
resulting from $A_4$ family symmetry breaking with residual $Z_3$ and $Z_2$
discrete symmetries respectively for the Higgs sectors generating the charged
lepton and neutrino mass matrices, can satisfy the required modifications. The
neutrino mass matrix is minimally modified with just one additional complex
parameter compared with the one producing the tri-bimaximal mixing. In this
case, the CP violating Jarlskog factor $J$ has a simple form
($|J|=|V_{e1}V_{e3}|/2\sqrt{3}$ for real neutrino mass matrix), and also
$V_{\mu i} = 1/\sqrt{3}$. We also discuss how this mixing matrix can be tested
experimentally.


title: Status of Chemical Freeze-Out

abstract:
  The status of the energy dependence of the chemical freeze-out temperature
and chemical potential obtained in heavy ion collisions is presented. Recent
proposals for chemical freeze-out conditions are compared.


title: Mini Black Holes in the first year of the LHC

abstract:
  The experimental signatures of TeV-mass black hole (BH) formation in heavy
ion collisions at the LHC is examined. We find that the black hole production
results in a complete disappearance of all very high $p_T$ ({$> 500$} GeV)
back-to-back correlated di-jets of total mass {$M > M_f \sim 1$}TeV. We show
that the subsequent Hawking-decay produces multiple hard mono-jets and discuss
their detection. We study the possibility of cold black hole remnant (BHR)
formation of mass $\sim M_f$ and the experimental distinguishability of
scenarios with BHRs and those with complete black hole decay. Due to the rather
moderate luminosity in the first year of LHC running the least chance for the
observation of BHs or BHRs at this early stage will be by ionizing tracks in
the ALICE TPC. Finally we point out that stable BHRs would be interesting
candidates for energy production by conversion of mass to Hawking radiation.


title: Towards jet tomography: gamma-hadron correlations

abstract:
  Hard pQCD processes taking place in ultrarelativistic heavy-ion collisions
are a well-calibrated probe. It is believed that the interaction with the
surrounding medium of outgoing partons from a hard vertex is capable of
revealing details of the medium. We demonstrate that correlation measurements
of hard photon-hadron back-to-back coincidences are a tool suitable to extract
such tomographic information. Introducing the concept of averaged evergy loss
probability distributions, we first argue that almost no information about
details of the medium evolution is reflected in the nuclear suppression factor
R_AA. Thus, a wide variety of jet quenching scenarios and geometries are
compatible with the measured data. This problem can be overcome by a
gamma-hadron correlation measurement. We show that averaged probability
distributions for quarks are accessible experimentally and sketch an analysis
procedure capable of distinguishing different energy loss scenarios leading to
the same nuclear suppression factor.


title: Little Higgs model effects in $\gamma \gamma \to \gamma \gamma$

abstract:
  Though the predictions of the Standard Model (SM) are in excellent agreement
with experiments there are still several theoretical problems associated with
the Higgs sector of the SM, where it is widely believed that some ``{\it new
physics}'' will take over at the TeV scale. One beyond the SM theory which
resolves these problems is the Little Higgs (LH) model. In this work we have
investigated the effects of the LH model on $\gggg$ scattering
\cite{Choudhury:2006xa}.


title:
Fermionic Corrections to the Three-Loop Matching Coefficient of the
  Vector Current

abstract:
  In this paper we consider the matching coefficient of the vector current
between Quantum Chromodynamics (QCD) and Non-Relativistic QCD (NRQCD) to
three-loop order in perturbation theory. We evaluate the fermionic corrections
containing a closed massless fermion loop. The results are building blocks both
for the bottom and top quark system at threshold. We explain in detail the
methods used for the evaluation of the Feynman diagrams, classify the occurring
master integrals and provide results for the latter. The numerical effects are
significant. They have the tendency to improve the behaviour of the
perturbative series -- both for the bottom and top quark system.


title: Mediation of Supersymmetry Breaking in Gauge Messenger Models

abstract:
  We study gauge mediation of supersymmetry breaking in SU(5) supersymmetric
grand unified theory with gauge fields as messengers. The generated soft
supersymmetry breaking parameters lead to close to maximal mixing scenario for
the Higgs mass and highly reduce the fine tuning of electroweak symmetry
breaking. All gaugino, squark and slepton masses are determined by one
parameter -- the supersymmetry breaking scale. The characteristic features are:
negative and non-universal squark and slepton masses squared at the unification
scale, non-universal gaugino masses, and sizable soft-trilinear couplings. In
this scenario, all soft supersymmetry breaking parameters at the unification
scale can be smaller than 400 GeV and all the superpartners can be lighter than
400 GeV and still satisfy all the limits from direct searches for superpartners
and also the limit on the Higgs mass. The lightest supersymmetric particle is
gravitino or a sizable mixture of bino, wino and higgsino. We also consider a
possible contributions from additional messengers in vector-like
representations, and a contribution from gravity mediation, which is estimated
to be comparable.


title: Inflaton Decay through Supergravity Effects

abstract:
  We point out that supergravity effects enable the inflaton to decay into all
matter fields, including the visible and the supersymmetry breaking sectors,
once the inflaton acquires a non-vanishing vacuum expectation value. The new
decay processes have great impacts on cosmology; the reheating temperature is
bounded below; the gravitinos are produced by the inflaton decay in a broad
class of the dynamical supersymmetry breaking models. We derive the bounds on
the inflaton mass and the vacuum expectation value, which severely constrain
high-scale inflations such as the hybrid and chaotic inflation models.


title:
Photon distribution amplitudes and light-cone wave functions in chiral
  quark models

abstract:
  The leading- and higher-twist distribution amplitudes and light-cone wave
functions of real and virtual photons are analyzed in chiral quark models. The
calculations are performed in the nonlocal quark model based on the instanton
picture of QCD vacuum, as well as in the spectral quark model and the
Nambu--Jona-Lasinio model with the Pauli-Villars regulator, which both treat
interaction of quarks with external fields locally. We find that in all
considered models the leading-twist distribution amplitudes of the real photon
defined at the quark-model momentum scale are constant or remarkably close to
the constant in the $x$ variable, thus are far from the asymptotic limit form.
The QCD evolution to higher momentum scales is necessary and we carry it out at
the leading order of the perturbative theory for the leading-twist amplitudes.
We provide estimates for the magnetic susceptibility of the quark condensate
$\chi_m$ and the coupling $f_{3\gamma}$, which in the nonlocal model turn out
to be close to the estimates from QCD sum rules. We find the higher-twist
distribution amplitudes at the quark model scale and compare them to the
Wandzura-Wilczek estimates. In addition, in the spectral model we evaluate the
distribution amplitudes and light-cone wave functions of the $\rho$-meson.


title: Dileptons, spectral weights, and conductivity in the Quark-Gluon Plasma

abstract:
  We re-examine soft dilepton emission from a weakly coupled Quark-Gluon
Plasma. We show that Braaten, Pisarski, and Yuan's result that the dilepton
rate rises as E^-4 (and the spectral weight scales as 1/E) at small energy
E<<gT is correct, but that the coefficient they found for this behavior is not
correct, because their analysis was incomplete. At still smaller scales, the
behavior moderates to ~1/E^2 for E <= g^4 T, consistent with a finite
electrical conductivity. We evaluate the spectral weight in the E~g^4 T region
by kinetic theory techniques and show that it satisfies a sum rule, which makes
the determination of electrical conductivity from the Euclidean correlation
function very challenging.


title: Physics aspects of polarized e+ at the linear collider

abstract:
  Polarized e- and e+ at the International Linear Collider play an important
role for discovering physics beyond the Standard Model and for precisely
unravelling the structure of the underlying physics. The physics programme at
the first energy stage at sqrt{s}=500 GeV benefits strongly from the
polarization of both beams. But also at 1 TeV as well as at a possible
multi-TeV design of a linear collider, CLIC, the physics output is greatly
enriched by beam polarization. An overview is given of the impact of providing
polarized e+ at the linear collider in addition to polarized e- for physics
studies in top, Higgs, supersymmetry and further models of physics beyond the
Standard Model.


title: Neutrinos and SU(3) Family Gauge Symmetry

abstract:
  We include the standard-model (SM) leptons in a recently proposed framework
for the generation of quark mass ratios and Cabibbo-Kobayashi-Maskawa (CKM)
mixing angles from an SU(3) family gauge interaction. The set of SM-singlet
scalar fields describing the spontaneous breaking is the same as employed for
the quark sector. The imposition at tree-level of the experimentally correct
Pontecorvo-Maki-Nakagawa-Sakata (PMNS) mixing matrix, in the form of a tri-bi
maximal structure, fixes several of the otherwise free parameters and renders
the model predictive. The normal hierarchy among the neutrino masses emerges
from this scheme.


title: Systematic study of the SU(3)_c X SU(4)_L X U(1)_X gauge symmetry

abstract:
  We carry a systematic study of possible extensions of the standard model
based on the gauge group SU(3)_c X SU(4)_L X U(1)_X. We consider both models
with particles with exotic electric charges and models which do not contain
exotic electric charges neither in the gauge boson sector nor in the fermion
sector. For the first case an infinite number of models can, in principle, be
constructed, while the restriction to non-exotic electric charges only allows
for eight different anomaly-free models. Four of them are three-family models
in the sense that anomalies cancel by an interplay between the three families,
and another two are one-family models where anomalies cancel family by family
as in the standard model. The remaining two are two-family models.


title: Spectral Distortions at Super-Kamiokande

abstract:
  We examine the effect of the rise in the survival probability of the electron
neutrinos with the decrease in the neutrino energy on the recoil electron
spectrum at Super-Kamiokande.


title: Precision physics with a wide band super neutrino beam

abstract:
  We carry out a state-of-the-art assessment of long baseline neutrino
oscillation experiments with wide band beams. We describe the feasibility of an
experimental program using existing high energy accelerator facilities, a new
intense wide band neutrino beam (0-6 GeV) and a proposed large detector in a
deep underground laboratory. We find that a decade-long program with 1 MW
operation in the neutrino mode and 2 MW operation in the antineutrino mode, a
baseline as long as the distance between Fermilab and the Homestake mine (1300
km) or the Henderson mine (1500 km), and a water Cherenkov detector with
fiducial mass of about 300 kT has optimum sensitivity to \theta_{13}, the mass
hierarchy and to neutrino CP violation at the 3\sigma C.L. for
\sin^22\theta_{13}>0.008. This program is capable of breaking the eight-fold
degeneracy down to the octant degeneracy without additional external input.


title:
Calculation of BR($\bar{B}^0\to \Lambda_{c}^++\bar p)$ in the PQCD
  Approach

abstract:
  We calculate the branching ratio of $\bar{B}^0 \to \Lambda_c^+ \bar{p}$ in
the PQCD approach. Most previous model calculations obtained branching ratios
significantly larger than experimental data. We find that the predicted
branching ratio for BR$(\bar{B}^0 \to \Lambda_c^+ \bar{p})$ in the PQCD
approach can vary over a range of $(2.3\sim 5.1)\times 10^{-5}$ with the
largest uncertainty coming from the parameters in the wave function of
$\Lambda_c$. With the favored values for the parameters in the $\Lambda_c^+$
wave function, $\beta = 1$ GeV and $m_q = 0.3$ GeV, the branching ratio is
about $2.3\times 10^{-5}$ which is satisfactorily consistent with the value
measured by experiments.


title:
Physics process of cosmogenics Li-9 and He-8 production on muons
  interactions with carbon target in liquid scintillator

abstract:
  Simulations were performed with GEANT4 to study the cosmogenics Li-9 and He-8
production by the interactions of the muons and their secondary shower
particles in the liquid scintillator. The photonuclear reactions seem dominate
their production. Their energy dependence were deduced. The comparisons with
available data show the reliability of the simulations results.


title: Cold dark matter in brane cosmology scenario

abstract:
  We analyze the dark matter problem in the context of brane cosmology. We
investigate the impact of the non-conventional brane cosmology on the relic
abundance of non-relativistic stable particles in high and low reheating
scenarios. We show that in case of high reheating temperature, the brane
cosmology may enhance the dark matter relic density by many order of magnitudes
and a stringent lower bound on the five dimensional scale is obtained. We also
consider low reheating temperature scenarios with chemical equilibrium and
non-equilibrium. We emphasize that in non-equilibrium case, the resulting relic
density is very small. While with equilibrium, it is increased by a factor of
O(10^2) with respect to the standard thermal production. Therefore, dark matter
particles with large cross section, which is favored by detection expirements,
can be consistent with the recent relic density observational limits.


title:
Matching perturbative and Parton Shower corrections to Bhabha process at
  flavour factories

abstract:
  We report on a high-precision calculation of the Bhabha process in Quantum
Electrodynamics, of interest for precise luminosity determination of
electron-positron colliders involved in R measurements in the region of
hadronic resonances. The calculation is based on the matching of exact
next-to-leading order corrections with a Parton Shower algorithm. The accuracy
of the approach is demonstrated in comparison with existing independent
calculations and through a detailed analysis of the main components of
theoretical uncertainty, including two-loop corrections, hadronic vacuum
polarization and light pair contributions. The calculation is implemented in an
improved version of the event generator BABAYAGA with a theoretical accuracy of
the order of 0.1%. The generator is now available for high-precision
simulations of the Bhabha process at flavour factories.


title: Charged Higgs Bosons decays H^\pm \to W^\pm (\gamma, Z) revisited

abstract:
  We study the complete one loop contribution to H^\pm\to W^\pm V, V= Z,
\gamma, both in the Minimal Supersymmetric Standard Model (MSSM) and in the Two
Higgs Doublet Model (2HDM). We evaluate the MSSM contributions and compare them
with the 2HDM ones taking into account b\to s\gamma constraint, vacuum
stability and unitarity constraints in the case of 2HDM, as well as
experimental constraints on the MSSM and 2HDM parameters. In the MSSM, we found
that in the intermediate range of \tan\beta \la 10 and for large A_t, the
branching ratio of H^\pm \to W^{\pm} Z can be of the order 10^{-3} while the
branching ratio of H^\pm \to W^{\pm} \gamma is of the order 10^{-5}. We also
study the effects of the CP violating phases of Soft SUSY parameters and found
that they can modify the branching ratio by about one order of magnitude.
However, in the 2HDM where the Higgs sector is less constrained as compared to
the MSSM higgs sector, one can reach branching ratio of the order 10^{-2} for
both modes.


title: The model of particle production by strong external sources

abstract:
  Using some knowledge of multiplicity disributions for high energy reactions,
it is possible to propose a simple analytical model of particle production by
strong external sources. The model describes qualitatively most peculiar
properties of the distributions. The generating function of the distribution
varies so drastically as it can happen at phase transitions.


title: The QCD Parton Model: a Useful Approximation

abstract:
  Approximate relations among transverse momentum dependent quark distribution
functions are established in the framework of the QCD parton model. The
validity of such results survives QCD evolution effects, owing to the Politzer
theorem on equations of motion. Furthermore the model fixes an energy scale,
involved in the parametrization of the correlator, which determines the Q^2
dependence of the azimuthal asymmetry in inclusive reactions. Some of the
present data - the cos2\phi symmetry in unpolarized Drell-Yan, the sin2\phi
single spin asymmetry in semi-inclusive deep inelastic scattering (SIDIS) and
the cos\phi asymmetry in unpolarized SIDIS - support model predictions. Further
measurements of SIDIS and Drell-Yan asymmetries are suggested, in particular
the double spin asymmetry in SIDIS, which allows to determine approximately the
proton transversity.


title:
Master Integrals for Massless Three-Loop Form Factors: One-Loop and
  Two-Loop Insertions

abstract:
  The three-loop form factors in massless QCD can be expressed as a linear
combination of master integrals. Besides a number of master integrals which
factorise into products of one-loop and two-loop integrals, one finds 16
genuine three-loop integrals. Of these, six have the form of a bubble insertion
inside a one-loop or two-loop vertex integral. We compute all master integrals
with these insertion topologies.


title:
The high-energy limit of inclusive and diffractive deep inelastic
  scattering in QCD

abstract:
  Following recent progresses in the understanding of high-energy scattering in
QCD, we derive the first phenomenological consequences of Pomeron loops, in the
context of both inclusive and diffractive deep inelastic scattering. In
particular, we discuss diffusive scaling, a new scaling law that emerges for
sufficiently high energies and up to very large values of $Q^2,$ well above the
proton saturation momentum.


title: How Large is the "Natural" Magnetic Moment?

abstract:
  The "natural" magntic moment of a particle of spin S is generally assumed to
be that given by the Belinfante conjecture and has the value g=1/S for its
gyromagnetic ratio. Thus, for the spin 1/2 electron we find the Dirac value
$g_e=2$. However, in the standard model the charged W boson, a spin one
particle, is found to have the value $g_{W^+}=2$. We show how this result comes
about and argue that the "natural" value for any particle of spin S should be
g=2, independent of spin.


title: Vacuum Birefringence as a Probe of Planck Scale Noncommutativity

abstract:
  Because of ultraviolet/infrared (UV/IR) mixing, the low energy physics of
noncommutative gauge theories in the Moyal-Weyl approach seems to depend
crucially on the details of the ultraviolet completion. However, motivated by
recent string theory analyses, we argue that their phenomenology with a very
general class of UV completions can be accurately modelled by a cutoff close to
the Planck scale. In the infrared the theory tends continuously to the
commutative gauge theory. If the photon contains contributions from a
trace-U(1), we would observe vacuum birefringence, i.e. a polarisation
dependent propagation speed, as a residual effect of the noncommutativity.
Constraints on this effect require the noncommutativity scale to be close to
the Planck scale.


title: Rare K and B Decays in the Littlest Higgs Model without T-Parity

abstract:
  We analyze rare K and B decays in the Littlest Higgs (LH) model without
T-parity. We find that the final result for the Z^0-penguin contribution
contains a divergence that is generated by the one-loop radiative corrections
to the currents corresponding to the dynamically broken generators. Including
an estimate of these logarithmically enhanced terms, we calculate the branching
ratios for the decays K^+ -> pi^+ nu bar nu, K_L -> pi^0 nu bar nu, B_{s,d} ->
mu^+ mu^- and B -> X_{s,d} nu bar nu. We find that for the high energy scale
f=O(2-3) TeV, as required by the electroweak precision studies, the enhancement
of all branching ratios amounts to at most 15% over the SM values. On the
technical side we identify a number of errors in the existing Feynman rules in
the LH model without T-parity that could have some impact on other analyses
present in the literature. Calculating penguin and box diagrams in the unitary
gauge, we find divergences in both contributions that are cancelled in the sum
except for the divergence mentioned above.


title: Suitability of A_4 as a Family Symmetry in Grand Unification

abstract:
  In the recent successful applications of the non-Abelian discrete symmetry
A_4 to the tribimaximal mixing of neutrinos, lepton doublets and singlets do
not transform in the same way. It appears thus to be unsuitable as a family
symmetry in grand unification. A simple resolution of this dilemma is proposed.


title:
One-Loop Corrections to the S and T Parameters in a Three Site Higgsless
  Model

abstract:
  In this paper we compute the the one-loop chiral logarithmic corrections to
the S and T parameters in a highly deconstructed Higgsless model with only
three sites. In addition to the electroweak gauge bosons, this model contains a
single extra triplet of vector states (which we denote \rho^{\pm} and \rho^0),
rather than an infinite tower of "KK" modes. We compute the corrections to S
and T in 'tHooft-Feynman gauge, including the ghost, unphysical
Goldstone-boson, and appropriate "pinch" contributions required to obtain
gauge-invariant results for the one-loop self-energy functions. We demonstrate
that the chiral-logarithmic corrections naturally separate into two parts, a
model-independent part arising from scaling below the \rho mass, which has the
same form as the large Higgs-mass dependence of the S or T parameter in the
standard model, and a second model-dependent contribution arising from scaling
between the \rho mass and the cutoff of the model. The form of the universal
part of the one-loop result allows us to correctly interpret the
phenomenologically derived limits on the S and T parameters (which depend on a
"reference" Higgs-boson mass) in this three-site Higgsless model. Higgsless
models may be viewed as dual to models of dynamical symmetry breaking akin to
"walking technicolor", and in these terms our calculation is the first to
compute the subleading 1/N corrections to the S and T parameters. We also
discuss the reduction of the model to the ``two-site'' model, which is the
usual electroweak chiral lagrangian, noting the ``non-decoupling''
contributions present in the limit as M_\rho goes to infinity.


title: Replay to hep-ph/0606266

abstract:
  The \phi\to\gamma\pi\pi amplitude is found from the e+e-\to\gamma\pi\pi
amplitude suggested in Ref. hep-ph/0606266. It is shown that the found
amplitude differs essentially from that studied in Refs. hep-ph/0606266 and
[3]. It is noticed that the suggestion of the author of Ref. hep-ph/0606266
about the phase of the \phi\to\gamma\pi\pi amplitude is misleading.


title: The Cabibbo angle : an algebraic calculation

abstract:
  We show that the Cabibbo angle theta\_c satisfies the relation tan(2
theta\_c)=-+/- 1/2 when universality for diagonal neutral currents of mass
eigenstates is satisfied at the same level of accuracy as the absence of their
off-diagonal counterparts. The predicted value is cos theta\_c \approx 0.9732,
only 7/10000 away from experimental results. No mass ratio appears in the
calculation. theta\_c occurs a priori for both quark species, and, showing that
one recovers the standard dependence of leptonic and semi-leptonic decays of
pseudoscalar mesons, we advocate, like for neutrinos and charged leptons, for a
symmetrical treatment of u and d-type quarks.


title: Refining threshold resummations

abstract:
  We describe some recent refinements of the techniques of threshold
resummation, with emphasis on the usefulness of dimensional regularization when
applied to nonabelian exponentiation. Threshold resummation is now under
theoretical control for DIS and electroweak annihilation cross sections all the
way to the fourth tower of logarithms and up to corrections suppressed by
powers of the threshold variable.


title: Photon acceleration in vacuum

abstract:
  A new process associated with the nonlinear optical properties of the
electromagnetic vacuum, as predicted by quantum electrodynamics, is described.
This can be called photon acceleration in vacuum, and corresponds to the
frequency shift that takes place when a given test photon interacts with an
intense beam of background radiation.


title:
Dynamical chiral symmetry breaking with Minkowski space integral
  representations

abstract:
  The fermion propagator is studied in the whole Minkowski space with the help
of the Schwinger-Dyson equations. Various integral representations are employed
to get solutions for the dynamical breaking of chiral symmetry in different
regimes of the coupling constant. In particular, in the case of massive boson,
we extend the singularity structure of the fermion propagator to the two real
pole Ansatz.


title: Fermion masses and mixings in a renormalizable SO(10) x Z_2 GUT

abstract:
  We investigate a scenario in a supersymmetric SO(10) Grand Unified Theory in
which the fermion mass matrices are generated by renormalizable Yukawa
couplings of the $\mathbf{10} \oplus \mathbf{120} \oplus \bar{\mathbf{126}}$
representation of scalars. We reduce the number of parameters by assuming
spontaneous CP violation and a $\mathbbm{Z}_2$ family symmetry, leading to nine
real Yukawa coupling constants for three families. Since in the ``minimal SUSY
SO(10) GUT'' an intermediate seesaw scale is ruled out and our scenario lives
in the natural extension of this theory by the $\mathbf{120}$, we identify the
vacuum expectation value (VEV) $w_R$ of $(\mathbf{10}, \mathbf{1}, \mathbf{3})
\in \bar{\mathbf{126}}$ with the GUT scale of $2 \times 10^{16}$ GeV. In order
to obtain sufficiently large neutrino masses, the coupling matrix of the scalar
$\bar{\mathbf{126}}$ is necessarily small and we neglect type II seesaw
contributions to the light-neutrino mass matrix. We perform a numerical
analysis of this 21-parameter scenario and find an excellent fit to
experimentally known fermion masses and mixings. We discuss the properties of
our numerical solution, including a consistency check for the VEVs of the
Higgs-doublet components in the SO(10) scalar multiplets.


title: Exact Quantum Loop Results in the Theory of General Relativity

abstract:
  We present a new approach to quantum general relativity based on the idea of
Feynman to treat the graviton in Einstein's theory as a point particle field
subject to quantum fluctuations just as any such field is in the well-known
Standard Model of the electroweak and strong interactions. We show that by
using resummation techniques based on the extension of the methods of Yennie,
Frautschi and Suura to Feynman's formulation of Einstein's theory, we get
calculable loop corrections that are even free of UV divergences. One further
by-product of our analysis is that we can apply it to a large class of
interacting field theories, both renormalizable and non-renormalizable, to
render their UV divergences finite as well. We illustrate our results with
applications of some phenomenological interest.


title: Neural network determination of the non-singlet quark distribution

abstract:
  We summarize the main features of our approach to parton fitting, and we show
a preliminary result for the non-singlet structure function. When comparing our
result to other PDF sets, we find a better description of large x data and
larger error bands in the extrapolation regions.


title:
Non--Singlet QCD Analysis of Deep Inelastic World Data at \boldmath
  $O(\alpha_s^3)$

abstract:
  A non--singlet QCD analysis of the structure function $F_2(x,q^2)$ in LO,
NLO, NNLO and N$^3$LO is performed based on the world data for charged lepton
scattering. We determine the valence quark parton densities and present their
parameterization and that of the correlated errors in a wide range of $x$ and
$Q^2$. In the analysis we determined the QCD--scale $\Lambda_{\rm QCD, N_f =
4}^{\bar{\rm MS}} = 265 \pm 27 \MeV {\rm (NLO)}, 226 \pm 25 \MeV {\rm (NNLO)},
234 \pm 26 \MeV {\rm (N^3LO)}$, with a remainder uncertainty of $\pm 2\MeV$ for
the yet unknown 4--loop anomalous dimension, corresponding to $\alpha_s(M_Z^2)
= 0.1148 \pm 0.0019 {\rm NLO}, 0.1134 {\tiny{\begin{array}{c} +0.0019 -0.0021
\end{array}}} {\rm NNLO}, 0.1141 {\tiny{\begin{array}{c} +0.0020 -0.0022
\end{array}}} {\rm N^3LO}$. A comparison is performed to other determinations
of the QCD scale and $\alpha_s(M_Z^2)$ in deeply inelastic scattering. The
higher twist contributions of $F_2^p(x,Q^2)$ and $F_2^d(x,Q^2)$ are extracted
in the large $x$ region, subtracting the twist--2 contributions obtained in the
NLO, NNLO and N$^3$LO analysis.


title:
Heavy-quark QCD vacuum polarisation function: analytical results at four
  loops

abstract:
  Fully analytical results for the first two moments of the heavy-quark vacuum
polarisation function at four loops in quantum chromo-dynamics are presented.


title:
Strong-Coupling Constant with Flavor Thresholds at Five Loops in the
  MS-bar Scheme

abstract:
  We present in analytic form the matching conditions for the strong-coupling
constant alpha_s^(n_f)(mu) at the flavor thresholds to four loops in the
modified minimal-subtraction scheme. Taking into account the present knowledge
on the coefficient beta_4 of the Callan-Symanzik beta function of quantum
chromo-dynamics, we thus derive a five-loop formula for alpha_s^(n_f)(mu)
together with appropriate relationships between the asymptotic scale parameters
Lambda^(n_f) for different numbers of flavors n_f.


title:
Heavy Flavor Hadrons in Statistical Hadronization of Strangeness-rich
  QGP

abstract:
  We study b, c quark hadronization from QGP. We obtain the yields of charm and
bottom flavored hadrons within the statistical hadronization model. The
important novel feature of this study is that we take into account the high
strangeness and entropy content of QGP, conserving strangeness and entropy
yields at hadronization.


title: Reduced Fine-Tuning in Supersymmetry with R-parity violation

abstract:
  Both electroweak precision measurements and simple supersymmetric extensions
of the standard model prefer a mass of the Higgs boson less than the
experimental lower limit of 114 GeV. We show that supersymmetric models with R
parity violation and baryon number violation have a significant range of
parameter space in which the Higgs dominantly decays to six jets. These decays
are much more weakly constrained by current LEP analyses and would allow for a
Higgs mass near that of the $Z$. In general, lighter scalar quark and other
superpartner masses are allowed and the fine-tuning typically required to
generate the measured scale of electroweak symmetry breaking is ameliorated.
The Higgs would potentially be discovered at hadron colliders via the
appearance of new displaced vertices. The lightest neutralino could be
discovered by a scan of vertex-less events LEP I data.


title: Little M-theory

abstract:
  Using the language of theory space, i.e. moose models, we develop a unified
framework for studying composite Higgs models at the LHC. This
framework--denoted little M-theory--is conveniently described by a
theoretically consistent three-site moose diagram which implements minimal
flavor and isospin violation. By taking different limits of the couplings, one
can interpolate between simple group-like and minimal moose-like models with
and without T-parity. In this way, little M-theory reveals a large model space
for composite Higgs theories. We argue that this framework is suitable as a
starting point for a comprehensive study of composite Higgs scenarios. The rich
collider phenomenology of this framework is briefly discussed.


title: Scalar Glueball, Scalar Quarkonia, and their Mixing

abstract:
  The isosinglet scalar mesons $f_0(1710)$, $f_0(1500)$, $f_0(1370)$ and their
mixing are studied. We employ two recent lattice results as the starting point;
one is the isovector scalar meson $a_0(1450)$ which displays an unusual
property of being nearly independent of quark mass for quark masses smaller
than that of the strange, and the other is the scalar glueball mass at 1710 MeV
in the quenched approximation. In the SU(3) symmetry limit, $f_0(1500)$ turns
out to be a pure SU(3) octet and is degenerate with $a_0(1450)$, while
$f_0(1370)$ is mainly an SU(3) singlet with a slight mixing with the scalar
glueball which is the primary component of $f_0(1710)$. These features remain
essentially unchanged even when SU(3) breaking is taken into account. We
discuss the sources of SU(3) breaking and their consequences on
flavor-dependent decays of these mesons. The observed enhancement of $\omega
f_0(1710)$ production over $\phi f_0(1710)$ in hadronic $J/\psi$ decays and the
copious $f_0(1710)$ production in radiative $J/\psi$ decays lend further
support to the prominent glueball nature of $f_0(1710)$.


title:
Chiral SU(3) Quark Model Study of Tetraquark States: $cn\bar{n}\bar{s} /
  cs\bar{s}\bar{s}$

abstract:
  The new members of the charm-strange family $D_{sJ}^{*}(2317)$,
$D_{sJ}(2460)$ and $D_s(2632)$, which have the surprising properties, are
challenging the present models. Many theoretical interpretations have been
devoted to this issue. Most of authors suggest that they are not the
conventional $c\bar s$ quark model states, but possibly are four-quark states,
molecule states or mixtures of a P-wave $c\bar s$ and a four-quark state. In
this work, we follow the four-quark-state picture, and study the masses of
$cn\bar n\bar s/cs\bar s\bar s$ states ($n$ is $u$ or $d$ quark) in the chiral
SU(3) quark model. The numerical results show that the mass of the mixed
four-quark state ($cn\bar n\bar s/cs\bar s\bar s$) with spin parity $J^P=0^{+}$
might not be $D_s(2632)$. At the same time, we also conclude that
$D_{sJ}^{*}(2317)$ and $D_{sJ}(2460)$ cannot be explained as the pure
four-quark state.


title: Fermion Masses and the UV Cutoff of the Minimal Realistic SU(5)

abstract:
  We investigate the predictions for fermion masses in the minimal realistic
non-supersymmetric SU(5) model with the Standard Model matter content. The
possibility to achieve b-\tau unification is studied taking into account all
relevant effects. In addition, we show how to establish an upper bound on the
ultraviolet cutoff \Lambda of the theory which is compatible with the Yukawa
couplings at the grand unified scale and proton decay. We find \Lambda \simeq
10^{17} GeV, to be considered a conservative upper bound on the cutoff. We also
provide up-to-date values of all the fermions masses at the electroweak scale.


title: On the running coupling constant in QCD

abstract:
  We try to review the main current ideas and points of view on the running
coupling constant in QCD. We begin by recalling briefly the classic analysis
based on the Renormalization Group with some emphasis on the exact solutions of
the RG equation for a given number of loops, in comparison with the usual
approximate expressions. We give particular attention to the problem of
eliminating the unphysical Landau singularities, and of defining a coupling
that remains significant at the infrared scales. We consider various proposals
of couplings directly related to the quark-antiquark potential or to other
physical quantities (effective charges) and discuss optimization in the choice
of the scale parameter and of the RS. Our main focus is, however, on dispersive
methods, their application, their relation with non-perturbative effects. We
try also to summarize the main results obtained by Lattice simulations in
various MOM schemes. We conclude briefly recalling the traditional comparison
with the experimental data.


title: Universality of Single Spin Asymmetries in Hard Processes

abstract:
  We discuss the use of time reversal symmetry in the classification of parton
correlators. Specifically, we consider the role of (small) intrinsic transverse
momenta in these correlators and the determination of the proper color gauge
link. The transverse momentum weighted correlators in hard processes can be
expressed as a product of universal gluonic pole matrix elements and gluonic
pole cross sections.


title: Instantaneous Interactions in Standard Model

abstract:
  Instantaneous interactions in Standard Model are derived by the resolution of
the Gauss constraints in inertial reference frames defined as irreducible
representations of the Poincare group. The relativistic covariant and
gauge-invariant S-matrix is constructed with taking into account instantaneous
interactions. Physical effects formed by the instantaneous interactions are
discussed, including the enhancement in the kaon --> pion transition
probability and the nonleptonic and semileptonic kaon decays. The low-energy
relations between these decay probability amplitudes and meson form factors are
established. Exploiting these relations we estimate possible parameters of the
differential K \to \pi e^+ e^- decay rate in the NA48/2 CERN experiment.


title: Comment on "Mass and K\Lambda Coupling of the N*(1535)"

abstract:
  We comment on a recent paper by B.C. Liu and B.S. Zou [Phys. Rev. Lett. 96,
042002 (2006)] where it was argued that the coupling of the N*(1535) to
K\Lambda is even larger than its coupling to the \eta N channel. Specifically,
we point out that recently measured Dalitz plot distributions for pp ->
pK^+\Lambda provide clear evidence for the importance of (p\Lambda) final-state
interactions in this reaction and, at the same time, exclude a decisive role of
the N*(1535) resonance, in contradiction to claims made by Liu and Zou.


title: Generalized parton distributions in a meson cloud model

abstract:
  We present a model calculation of the generalized parton distributions where
the nucleon is described by a quark core surrounded by a mesonic cloud. In the
one-meson approximation, we expand the Fock state of the physical nucleon in a
series involving a bare nucleon and two-particle, meson-baryon, states. We
discuss the role of the different Fock-state components of the nucleon by
deriving a convolution formalism for the unpolarized generalized parton
distributions, and showing predictions at different kinematics.


title: V_us From Hadronic Tau Decays

abstract:
  We study extractions of |V_us| based on finite energy sum rule (FESR)
analyses of hadronic tau decay data. We show (i) that the ``(0,0) spectral
weight'' implementation (proposed previously in the literature as a favorable
version of this analysis) suffers from significant convergence problems, but
(ii) that alternate implementations exist which bring these problems under
control. Results based on present spectral data are shown to be in agreement
with those of other approaches, though with, at present, somewhat larger
experimental errors. Sub-1% determinations of |V_us| are also shown to be
expected from these alternate analyses once tau data from the B factories
becomes available.


title: Axions and their Relatives

abstract:
  A review of the status of axions and axion-like particles is given. Special
attention is devoted to the recent results of the PVLAS collaboration, which
are in conflict with the CAST data and with the astrophysical constraints.
Solutions to the puzzle and the implications for new physics are discussed. The
question of axion-like particles being dark matter is also addressed.


title: Weak interactions of supersymmetric staus at high energies

abstract:
  Neutrino telescopes may have the potential to detect the quasi-stable staus
predicted by supersymmetric models. Detection depends on stau electromagnetic
energy loss and weak interactions. We present results for the weak interaction
contribution to the energy loss of high energy staus as they pass through rock.
We show that the neutral current weak interaction contribution to the energy
loss increases with energy, but it is much smaller than the photonuclear energy
loss, however, the charged current contribution may become the dominant process
above the energy of $\sim 10^9$ GeV, depending on the parameters of the model.
As a consequence, the stau range may be reduced above $\sim 10^9$ GeV as
compared to the range neglecting weak interactions. We contrast this with the
tau range which is barely changed with the inclusion of charged current
interactions.


title: Charmless inclusive B decays and the extraction of V(ub)

abstract:
  This work discusses charmless inclusive B decays and their application to the
extraction of $|V_{ub}|$. Starting from first principles we relate the
differential decay rate to the hadronic tensor in terms of optimal choice of
kinematical variables. We review the traditional methods of calculating the
hadronic tensor, expansion in $\alpha_s$ and HQET, and discuss their
shortcomings. In the kinematical region relevant for experiment ("shape
function" region), the hadronic tensor can be factorized, at each order in
$1/m_b$, as a product of calculable hard functions and a convolution of
calculable jet functions with non perturbative shape functions. Using SCET, we
calculate the leading order hard and jet function to first order in $\alpha_s$.
Large logarithms are resummed in RGE improved perturbation theory. Local OPE is
used to relate moments of the renormalized shape function to HQET parameters,
defined in the "shape function scheme". Beyond leading order in $1/m_b$,
several subleading shape functions arise. We derive them at tree level, where
they can be expressed as forward matrix elements of bi-local light-cone
operators. Based on these theoretical calculations we present two applications.
In the first, we present the "state-of-the-art " expressions for the triple
differential $\bar B\to X_u l\bar\nu$ decay rate and the $\bar B\to X_s\gamma$
photon spectrum. These expressions include all known contributions and smoothly
interpolate between the "shape-function" and "OPE region". Based on these an
event generator can be constructed, from which the theoretical prediction for
any experimental cut can be extracted. In the second, a weight function is
constructed that relates the $P_+$ spectrum in $\bar B\to X_u l\bar\nu$ to the
normalized $\bar B\to X_s\gamma$ photon spectrum.


title: Confinement of monopole field lines in a superconductor at T=/=0

abstract:
  We apply the Bogoliubov-de Gennes equations to the confinement of a
monopole-antimonopole pair in a superconductor. This is related to the problem
of a quark-antiquark pair bound by a confining string, consisting of a
colour-electric flux tube, dual to the magnetic vortex of type-II
superconductors. We study the confinement of the field lines due to the
superconducting state and calculate the effective potential between the two
monopoles. At short distances the potential is Coulombic and at large distances
the potential is linear, as previously determined solving the Ginzburg-Landau
equations. The magnetic field lines and the string tension are also studied as
a function of the temperature $T$. Because we take into account the explicit
fermionic degrees of freedom, this work may open new perspectives to the
breaking of chiral symmetry or to colour superconductivity.


title:
Branching Ratio and CP Asymmetry of $B^0 \to \eta^{(\prime)}
  \eta^{(\prime)}$ Decays in the Perturbative QCD Approach

abstract:
  We calculate the CP averaged branching ratios and CP-violating asymmetries
for $B^0 \to \eta \eta, \eta \eta^\prime$ and $\eta^\prime \eta^\prime$ decays
by employing the perturbative QCD (pQCD) factorization approach. The pQCD
predictions for the CP-averaged branching ratios are $Br(B^0 \to \eta \eta)
\approx 0.67 \times 10^{-7}$, $Br(B^0 \to \eta \eta^\prime) \approx 0.18 \times
10^{-7}$, and $Br(B^0 \to \eta^{\prime} \eta^{\prime}) \approx 0.11 \times
10^{-7}$, which are consistent with currently available experimental upper
limits. We also predict large CP-violating asymmetries for the considered three
decay modes, which can be tested by the future B meson experiments.


title: K-->pipi amplitudes from lattice QCD with a light charm quark

abstract:
  We compute the leading-order low-energy constants of the DeltaS=1 effective
weak Hamiltonian in the quenched approximation of QCD with up, down, strange,
and charm quarks degenerate and light. They are extracted by comparing the
predictions of finite volume chiral perturbation theory with lattice QCD
computations of suitable correlation functions carried out with quark masses
ranging from a few MeV up to half of the physical strange mass. We observe a
large DeltaI=1/2 enhancement in this corner of the parameter space of the
theory. Although matching with the experimental result is not observed for the
DeltaI=1/2 amplitude, our computation suggests large QCD contributions to the
physical DeltaI=1/2 rule in the GIM limit, and represents the first step to
quantify the role of the charm quark-mass in K-->pipi amplitudes.


title: Puzzles in $B\to h_c(\chi_{c2})K$ Decays and QCD Factorization

abstract:
  We study the factorization-forbidden decays $B\to h_c K$ and $B\to\chi_{c2}K$
in the QCD factorization approach. If neglecting the vertex corrections and
regularizing the end-point singularities in spectator corrections properly, we
get small branching ratios for both the two decay modes, which are roughly
consistent with the experimental upper limits. This is in contrast to another
factorization-forbidden decay $B\to \chi_{c0}K$, for which a large decay rate
is obtained in the same approach.


title:
Bose-Einsten correlations in multiple particle production from 1959 to
  1989

abstract:
  The evolution of the experimental knowledge and of the theoretical ideas
about Bose-Einstein correlations in multiple particle production processes,
during the first thirty years from their discovery, is reviewed.


title:
Single Inclusive Distribution and Two-Particle Correlations Inside One
  Jet at "Modified Leading Logarithmic Approximation" of Quantum Chromodynamics
  II : Steepest Descent Evaluation at Small X

abstract:
  The MLLA single inclusive distribution inside one high energy (gluon) jet at
small x is estimated by the steepest descent method. Its analytical expression
is obtained outside the "limiting spectrum". It is then used to evaluate
2-particle correlations at the same level of generality. The dependence of both
observables on the ratio between the infrared cutoff Q\_0 and Lambda\_QCD is
studied. Fong & Webber's results for correlations are recovered at the limits
when this ratio goes to 1 and when one stays close to the peak of the single
inclusive distribution.


title:
Extraction of Spectral Functions from Dyson-Schwinger Studies via the
  Maximum Entropy Method

abstract:
  It is shown how to apply the Maximum Entropy Method (MEM) to numerical
Dyson-Schwinger studies for the extraction of spectral functions of correlators
from their corresponding Euclidean propagators. Differences to the application
in lattice QCD are emphasized and, as an example, the spectral functions of
massless quarks in cold and dense matter are presented.


title:
Event-shape of dileptons plus missing energy at a linear collider as a
  SUSY/ADD discriminant

abstract:
  Objective, Signal cross section, SM background and chosen cuts, Event-shape
variables, Results and discussion.


title:
The Possible Heavy Tetraquarks $qQ\bar q \bar Q$, $qq\bar Q \bar Q$ and
  $qQ\bar Q \bar Q$

abstract:
  Assuming X(3872) is a $qc \bar q \bar c$ tetraquark and using its mass as
input, we perform a schematic study of the masses of possible heavy tetraquarks
using the color-magnetic interaction with the flavor symmetry breaking
corrections.


title:
Polarisation observables in lepton antilepton to proton antiproton
  reactions including lepton mass

abstract:
  General expressions, including the lepton mass, for the spin averaged
differential cross section for the annihilation reaction lepton antilepton to
proton antiproton are given, as well as general formulae for the single and
double spin asymmetries in the centre of mass frame. In particular we discuss
the single spin asymmetry, normal to the scattering plane, which measures the
relative phase difference between nucleon electromagnetic form factors $G_E$
and $G_M$. Recent experimental investigations of these form factors in the
space and time like region are reviewed. It is thought that measurements of the
phase of these form factors will provide fundamental information on the
internal nucleon structure. The phases between $G_E$ and $G_M$ are accessible
through polarisation observables measured in the antiproton proton to lepton
antilepton reaction, or in its time reversed process.


title:
Factorization and Momentum-Space Resummation in Deep-Inelastic
  Scattering

abstract:
  Renormalization-group methods in soft-collinear effective theory are used to
perform the resummation of large perturbative logarithms for deep-inelastic
scattering in the threshold region x->1. The factorization theorem for the
structure function F_2(x,Q^2) for x->1 is rederived in the effective theory,
whereby contributions from the hard scale Q^2 and the jet scale Q^2(1-x) are
encoded in Wilson coefficients of effective-theory operators. Resummation is
achieved by solving the evolution equations for these operators. Simple
analytic results for the resummed expressions are obtained directly in momentum
space, and are free of the Landau-pole singularities inherent to the
traditional moment-space results. We show analytically that the two methods are
nonetheless equivalent order by order in the perturbative expansion, and
perform a numerical comparison up to next-to-next-to-leading order in
renormalization-group improved perturbation theory.


title:
Can a vector field be responsible for the curvature perturbation in the
  Universe?

abstract:
  I investigate the possibility that the observed curvature perturbation is due
to a massive vector field. To avoid generating a large scale anisotropy the
vector field is not taken to be driving inflation. Instead it is assumed to
become important after inflation when it may dominate the Universe and imprint
its perturbation spectrum before its decay, as in the curvaton scenario. It is
found that, to generate a scale invariant spectrum of perturbations, the
mass-squared of the vector field has to be negative and comparable to the
Hubble scale during inflation. After inflation the mass-squared must become
positive so that the vector field engages into oscillations. It is shown that,
such an oscillating vector field behaves as pressureless matter and does not
lead to large scale anisotropy when it dominates the Universe. The possibilitiy
of realising this scenario in supergravity is also outlined.


title: Null tests of the Standard Model at an International Super $B$ Factory

abstract:
  In light of the results from the B factories, which clearly show that the
Cabibbo-Kobayashi-Maskawa mechanism is the dominant source of the observed CP
violation in K and B physics, only small deviations due to sources of CP
violation beyond the Standard Model are likely. Therefore, in the quest for New
Physics, null tests of the Standard Model become increasingly important.
Motivated by these considerations, we describe a number of approximate null
tests of the Standard Model. These tests provide several theoretically clean
approaches to searching for new physics in the B system. We find that in many
cases, the requisite sensitivity can only be achieved with an International
Super B Factory, with luminosity around 10^36 cm^-2 s^-1.


title:
Behavior of the S Parameter in the Crossover Region Between Walking and
  QCD-Like Regimes of an SU(N) Gauge Theory

abstract:
  We consider a vectorial, confining SU(N) gauge theory with a variable number,
$N_f$, of massless fermions transforming according to the fundamental
representation. Using the Schwinger-Dyson and Bethe-Salpeter equations, we
calculate the $S$ parameter in terms of the current-current correlation
functions. We focus on values of $N_f$ such that the theory is in the crossover
region between the regimes of walking behavior and QCD-like (non-walking)
behavior. Our calculations indicate that the contribution to $S$ from a given
fermion decreases as one moves from the QCD-like to the walking regimes. The
implications of this result for technicolor theories are discussed.


title: Quark lepton complementarity and renormalization group effects

abstract:
  We consider a scenario for the Quark-Lepton Complementarity relations between
mixing angles in which the bi-maximal mixing follows from the neutrino mass
matrix. According to this scenario in the lowest order the angle \theta_{12} is
\sim 1\sigma (1.5 - 2^\circ) above the best fit point coinciding practically
with the tri-bimaximal mixing prediction. Realization of this scenario in the
context of the seesaw type-I mechanism with leptonic Dirac mass matrices
approximately equal to the quark mass matrices is studied. We calculate the
renormalization group corrections to \theta_{12} as well as to \theta_{13} in
the standard model (SM) and minimal supersymmetric standard model (MSSM). We
find that in large part of the parameter space corrections \Delta \theta_{12}
are small or negligible. In the MSSM version of the scenario the correction
\Delta \theta_{12} is in general positive. Small negative corrections appear in
the case of an inverted mass hierarchy and opposite CP parities of \nu_1 and
\nu_2 when leading contributions to \theta_{12} running are strongly
suppressed. The corrections are negative in the SM version in a large part of
the parameter space for values of the relative CP phase of \nu_1 and \nu_2:
\phi > \pi/2.


title: A "Muon Mass Tree" with alpha-quantized Lepton, Quark and Hadron Masses

abstract:
  A "muon mass tree" is displayed that contains the excitation systematics for
accurately reproducing the masses of the six Standard Model quarks
(u,d,s,c,b,t); the heavy leptons; the proton; the phi, J/Psi and Upsilon vector
meson thrshold states; the Bc meson; and the mass-averaged W and Z gauge
bosons, using a unified mass formalism based on the electron ground state.
Multiples of an alpha-quantized 105.04 MeV fermion mass quantum reproduce the
states below 12 GeV, and multiples of a doubly-alpha-quantized 14,394 Mev
fermion mass quantum reproduce the W-Z and t states above 12 GeV, where alpha ~
1/137 is the fine structure constant. Masses are additive, and the overall mass
accuracy for these states is in the 1% range. A similar "pion mass tree" based
on an alpha-quantized 70.03 MeV boson mass quantum accurately reproduces the
pseudoscalar meson masses. The mass alpha-quantization follows from a
corresponding experimental alpha-spacing of the long-lived particle lifetimes,
which occur in well-defined lifetime groups that are each determined by a
dominant Standard Model quark substate.


title: Transverse-Momentum Dependent Factorization for gamma^* pi^0 to gamma

abstract:
  With a consistent definition of transverse-momentum dependent (TMD)
light-cone wave function, we show that the amplitude for the process $\gamma^*
\pi^0 \to\gamma$ can be factorized when the virtuality of the initial photon is
large. In contrast to the collinear factorization in which the amplitude is
factorized as a convolution of the standard light-cone wave function and a hard
part, the TMD factorization yields a convolution of a TMD light-cone wave
function, a soft factor and a hard part. We explicitly show that the TMD
factorization holds at one loop level. It is expected that the factorization
holds beyond one-loop level because the cancelation of soft divergences is on a
diagram-by-diagram basis. We also show that the TMD factorization helps to
resum large logarithms of type $\ln^2x$.


title:
Coherent and incoherent processes and the LPM effect in oriented single
  crystals at high-energy

abstract:
  The process of radiation from high-energy electron and electron-positron pair
production by a photon in oriented single crystal is considered using the
method which permits inseparable consideration of both coherent and incoherent
mechanisms of photon emission from an electron and of pair creation by a photon
and includes the action of field of axis (or plane) as well as the multiple
scattering of radiating electron or particles of the created pair (the
Landau-Pomeranchuk-Migdal (LPM) effect). The total intensity of radiation and
total probability pair creation are calculated. The theory, where the energy
loss of projectile has to be taken into account, and found probabilities of
pair creation agree quite satisfactory with available CERN data. From obtained
results it follows that multiple scattering appears only for relatively low
energy of radiating electron or a photon, while at higher energies the field
action excludes the LPM effect.


title:
WWZ, WWH, and ZZH Couplings in the Dynamical Gauge-Higgs Unification in
  the Warped Spacetime

abstract:
  In the dynamical gauge-Higgs unification in the Randall-Sundrum warped
spacetime, where the 4D Higgs field is unified with gauge fields and the
electroweak symmetry is dynamically broken by the Hosotani mechanism, the
trilinear couplings for WWZ, WWH, and ZZH, where H stands for the Higgs field,
are evaluated. The latter two couplings are suppressed by a factor of \cos
\theta_H where \theta_H is the Yang-Mills Aharonov-Bohm phase in the extra
dimension, while the WWZ couplings remain the same as in the standard model to
good accuracy.


title: Modular inflation and the curvaton

abstract:
  Supersymmetric Peccei-Quinn models which provide a suitable candidate for the
curvaton field are studied. These models also solve the mu problem, while
generating the Peccei-Quinn scale dynamically. The curvaton is a pseudo
Nambu-Goldstone boson corresponding to an angular degree of freedom orthogonal
to the axion. Its order parameter increases substantially following a phase
transition during inflation. This results in a drastic amplification of the
curvaton perturbations. Consequently, these models are able to accommodate
low-scale inflation with Hubble parameter at the TeV scale such as modular
inflation. We find that modular inflation with the orthogonal axion as curvaton
can indeed account for the observations for natural values of the parameters.
In particular, the spectral index can easily be made adequately lower than
unity in accord with the recent data.


title: Higher Twist Effects in Proton-Proton Collisions

abstract:
  In this article, we investigate the contribution of the high twist Feynman
diagrams to the large-$p_T$ pion production cross section in proton-proton
collisions and we present the general formulae for the high and leading twist
differential cross sections. The pion wave function where two non-trivial
Gegenbauer coefficients $a_2$ and $a_4$ have been extracted from the CLEO data,
two other pion model wave functions, $P_2$, $P_3$, the asymptotic and the
Chernyak-Zhitnitsky wave functions are used in the calculations. The results of
all the calculations reveal that the high twist cross sections, the ratios $R$,
$r$, the dependence transverse momentum $p_T$ and the rapidity $y$ of pion in
the $\Phi_{CLEO}(x,Q^2)$ wave function case is very close to the
$\Phi_{asy}(x)$ asymptotic wave function case. It is shown that the high twist
contribution to the cross section depends on the choice of the meson wave
functions.


title:
Heavy Quark Pair Production near Threshold with Potential
  Non-Relativistic QCD

abstract:
  We study the effect of the resummation of logarithms for t\bar{t} production
near threshold and inclusive electromagnetic decays of heavy quarkonium. This
analysis is complete at next-to-next-to-leading order and includes the full
resummation of logarithms at next-to-leading-logarithmic accuracy and some
partial contributions at next-to-next-to-leading logarithmic accuracy. Compared
with fixed-order computations at next-to-next-to-leading order the scale
dependence and convergence of the perturbative series is greatly improved for
both the position of the peak and the normalization of the total cross section.
Nevertheless, we identify a possible source of large scale dependence in the
result. At present we estimate the remaining theoretical uncertainty of the
normalization of the total cross section to be of the order of 10% and for the
position of the peak of the order of 100 MeV.


title: Dimensional Reduction applied to QCD at three loops

abstract:
  Dimensional Reduction is applied to \qcd{} in order to compute various
renormalization constants in the \drbar{} scheme at higher orders in
perturbation theory. In particular, the $\beta$ function and the anomalous
dimension of the quark masses are derived to three-loop order. Special emphasis
is put on the proper treatment of the so-called $\epsilon$-scalars and the
additional couplings which have to be considered.


title: In Pursuit of New Physics in the B System

abstract:
  The B-meson system offers interesting probes for the search of physics beyond
the Standard Model. After addressing possible signals of new-physics
contributions to the B -> phi K and B -> pi K decay amplitudes, we focus on the
data for B^0_q-\bar B^0_q mixing (q = d, s), giving a critical discussion of
their interpretation in terms of model-independent new-physics parameters. We
address, in particular, the impact of the uncertainties of the relevant input
parameters, discuss benchmarks for future precision measurements at the LHC,
and explore the prospects for new CP-violating effects in the B_s-meson system,
which could be detected at the LHC.


title:
Resonance Production in Heavy Ion Collisions - what can we learn from
  RHIC?

abstract:
  In these proceedings we concentrate on the refeeding and rescattering
probability of hadronic resonances. We discuss the probability to form
resonances in binary baryon-meson or meson-meson collisions as a function of
time for various resonances using a transport model approach (UrQMD). We give
an estimate of the re-feeding probability using a simplified thermal approach
and discuss the relevance for the resonance/non-resonance ratio measured by
STAR.


title:
Light Propagation in a Background Field for Time-Space Noncommutativity
  and Axionic Noncommutative QED

abstract:
  We study the low-energy effects of space-time non-commutativity on light
propagation in a background electromagnetic field. Contrary to some of the
previous claims, we find no polarization rotation for vanishing time-space
commutator $[\hat{x}^i,\hat{x}^0]= 0$, although dispersion relation is
modified, allowing for propagation faster than the vacuum speed of light. For
non-zero $[\hat{x}^i,\hat{x}^0]$, as allowed with a proper quantization, a
naive rotation effect is found to be actually absent when physical fields are
defined through Seiberg-Witten map. We also consider non-commutative QED weakly
coupled to small mass particles such as axions. Non-commutativity is found to
dominate the inverse oscillation length, compared to axion mass and QED
effects, for mixing particle masses smaller than $10^{-12} eV$. Conventional
constraints on axion coupling based on photon-axion transition rates are
unmodified, however induced ellipticity is proportional to the
non-commutativity squared length scale. This last effect is found to be too
small to account for the ellipticity reported by the PVLAS experiment, yet
unexplained by conventional QED or axion physics.


title: Fermion Mass Generation in SO(10) with a Unified Higgs Sector

abstract:
  An analysis of generating fermion masses via cubic couplings in SO(10) grand
unification with a unified Higgs sector is given. The new framework utilizes a
single pair of vector--spinor representation $144+\bar{144}$ to break the gauge
symmetry all the way to $SU(3)_C \times U(1)_{em}$. Typically the matter--Higgs
couplings in this framework are quartic and lead to naturally suppressed Yukawa
couplings for the first two generations. Here we show that much larger third
generation couplings naturally arise at the cubic level with additional matter
in 10--plet and 45--plet representations of SO(10). Thus the physical third
generation is a mixture of 16, 10 and 45--plet representations while the
remaining components become superheavy and are removed from the low energy
spectrum. In this scenario it is possible to understand the heaviness of the
top in a natural way since the analysis generates a hierarchy in the Yukawa
couplings so that $h_{\textnormal {t}}/h_{\textnormal {b}}>> 1$ where
$h_{\textnormal {t}} (h_{\textnormal {b}})$ are the top (bottom) Yukawa
couplings. It is then possible to realize values of $\tan\beta$ as low as 2,
which also helps to stabilize the proton.


title:
$D_{sJ}(2860)$ resonance and the $s_\ell^P={5\over 2}^-$ $c \bar s$ ($c
  \bar q$) doublet

abstract:
  We analyze the recently discovered $D_{sJ}(2860)$ meson using arguments based
on the heavy quark expansion together with the experimental observations. We
consider the possible quantum number assignments, arguing that the
interpretation of the meson as the $J^P=3^-$ $c \bar s$ state is favoured.


title:
Bayesian Statistics at Work: the Troublesome Extraction of the CKM Phase
  alpha

abstract:
  In Bayesian statistics, one's prior beliefs about underlying model parameters
are revised with the information content of observed data from which, using
Bayes' rule, a posterior belief is obtained. A non-trivial example taken from
the isospin analysis of B-->PP (P = pi or rho) decays in heavy-flavor physics
is chosen to illustrate the effect of the naive "objective" choice of flat
priors in a multi-dimensional parameter space in presence of mirror solutions.
It is demonstrated that the posterior distribution for the parameter of
interest, the phase alpha, strongly depends on the choice of the
parameterization in which the priors are uniform, and on the validity range in
which the (un-normalizable) priors are truncated. We prove that the most
probable values found by the Bayesian treatment do not coincide with the
explicit analytical solution, in contrast to the frequentist approach. It is
also shown in the appendix that the alpha-->0 limit cannot be consistently
treated in the Bayesian paradigm, because the latter violates the physical
symmetries of the problem.


title: Dilepton distributions at backward rapidities

abstract:
  The dilepton production at backward rapidities in $pAu$ and $pp$ collisions
at RHIC and LHC energies is investigated in the dipole approach. The results
are shown through the nuclear modification ratio $R_{pA}$ considering
transverse momentum and rapidity spectra. The dilepton modification ratio
presents interesting behavior at the backward rapidities when compared with the
already known forward ones, since it is related with the large $x$ kinematical
region that is being probed. The rapidity dependence of the nuclear
modification ratio in the dilepton production is strongly dependent on the
Bjorken $x$ behavior of the nuclear structure function ratio
$R_{F_{2}}=F_{2}^{A}/F_{2}^{p}$. The $R_{pA}$ transverse momentum dependence at
backward rapidities is modified due to the large $x$ nuclear effects: at RHIC
energies, for instance, the ratio $R_{pA}$ is reduced as $p_T$ increases,
presenting an opposite behavior when compared with the forward one. It implies
that the dilepton production at backward rapidities should carry information of
the nuclear effects at large Bjorken $x$, as well as that it is useful to
investigate the $p_T$ dependence of the observables in this kinematical regime.


title: The Greisen Equation Explained and Improved

abstract:
  Analytic description of the evolution of cosmic ray showers is dominated by
the Greisen equation nearly five decades old. We present an alternative
approach with several advantages. Among the new features are a prediction of
the differential distribution, replacing Greisen's form which fails to be
positive definite. Explicit comparison with Monte Carlo simulations shows
excellent agreement after a few radiation lengths of development. We find a
clear connection between Monte Carlo adjustment of Greisen's form and
underlying physics, and present a concise derivation with all steps explicit.
We also reconstruct the steps needed to reproduce Greisen's approximate
formula, which appears not to have been published previously.


title: Perturbative QCD study of $B_{\small (s)}\to \phi\rho$ decays

abstract:
  We study $B_{\small (s)}\to \phi\rho$ decays in a perturbative QCD approach
based on $k_T$ factorization. In this approach, we calculate factorizable and
non-factorizable contributions, there are no annihilation contributions due to
quark content. We get the branching ratios and polarization fractions for
$B_{\small (s)}\to \phi\rho$ decays . Our predictions are consistent with the
current experimental data.


title: Diagrammatics of the Dimensionally Reduced Action in phi^4 theory

abstract:
  We describe the Feynman rules for the construction of the Dimensionally
Reduced Action (DRA) for a phi^4 field theory, as well as rules for the
construction of the connected Green functions and the Dimensionally Reduced
Effective Action (DREA), the effective action obtained from the DRA. Two and
four-point connected Green functions are calculated to illustrate the
application of those rules, and to exhibit the subtraction of UV divergences.
As the DRA formalism expands about a background field, instead of the high
temperature expansion obtained in the usual dimensional reduced field theory,
we derive an expansion that is defined for all range of temperatures. We make a
low temperature analysis of the DREA by considering soft modes. In particular,
we study the case of near zero mass.


title:
Remarks on CLEO New Measurements for Upsilon(1S) Decays to Charmonium
  Final States and Investigations on Associate Strange Particle Enhancement in
  Upsilon to J/Psi +X

abstract:
  The recent measurements by CLEO Collaboration for the inclusive J/Psi and
Psi(2S) production in Upsilon(1S) decay and our previous calculation are
analyzed. The J/Psi momentum spectrum and the production ratio of Psi(2S)
versus J/Psi favour Upsilon to J/Psi(Psi(2S)) + ccbar g as the dominant
contribution. We point out that the differences between the experimental data
and our previous results are mainly originated from the setting of the
parameter charm quark mass. We further suggest the associate strange particle
enhancement as a probe for the open charm particles in Upsilon to J/Psi
(Psi(2S)) + ccbar g.


title: Msgut Reborn ?

abstract:
  We present examples of fits of fermion mass data using the
$\mathbf{10-120-\oot}$ FM Higgs system in Susy SO(10) GUTs that follow the
scenario\cite{blmdoom,nmsgutI} in which the $\mathbf{120}$ -plet collaborates
with the $ \mathbf{10}$-plet to fit the charged fermion masses while small
$\mathbf{\oot} $-plet couplings enhance the Type I seesaw neutrino masses to
viable values and make the fit to light fermions accurate. Restricting
ourselves to the CP conserving case we use a linear perturbative technique to
obtain accurate charged fermion fits ($\chi^2_{tot} < .2 $) to all the charged
fermion masses and angles. The resulting fits imply Type I neutrino masses that
are generically $10^2- 10^3$ times larger than those obtained in the
$\mathbf{10-\oot}$ scenario precisely because of the small $\mathbf{\oot} $
coupling. Thus the difficulty of obtaining sufficiently large neutrino masses
in the context of these Next to Minimal Susy GUTs is essentially removed. The
remaining free parameters allow one to obtain the correct ratio of neutrino
mass squared splitting and a large($\theta_{23}^{PMNS}$) and
small($\theta_{13}^{PMNS}$) mixing angle. The $\theta_{12}^{PMNS}$ is however
small and this indicates that -as in the Type I $\mathbf{10-\oot}$ case - a
fully realistic fit to the lepton mixing data also \emph{requires} CP
violation.


title: X(1576) as Diquark-Antidiquark Bound State

abstract:
  We propose that the broad $1^{--}$ resonance structure recently discovered by
BES in $J/\psi\to K^{+}K^{-}\pi^{0}$ is the P-wave excitation of a
diquark-antidiquark bound state. This interpretation implies that there exists
a negative parity, vector nonet. A rough estimate of the mass spectrum of the
nonet is presented, and the prediction for the mass of X(1576) is consistent
with the experimental data. The OZI allowed strong decays are studied, it can
decay into two pseudoscalars or one pseudoscalar plus one vector meson. A
crucial prediction is that X(1576) should dominantly decay into $K^{+}K^{-}$,
$K_{L}K_{S}$, $\phi\pi^{0}$. Since the isospin of X(1576) is $\mathbf{1}$, the
observation of $I_3=1$ or $I_3=-1$ states which predominantly decays into
strange mesons could provide another important test to our proposal. To search
the charged $I_3=1$ isospin partner associated with X(1576) in $J/\psi\to
\eta\pi^{+}\pi^{-}$, $J/\psi\to K^{+}K_{L}\pi^{-}$, $J/\psi\to
K^{+}K_{S}\pi^{-}$, $J/\psi\to \phi\pi^{+}\pi^{-}$ is suggested.


title: Bottomonium Production in the Regge Limit of QCD

abstract:
  We study bottomonium hadroproduction in proton-antiproton collisions at the
Fermilab Tevatron in the framework of the quasi-multi-Regge kinematics approach
and the factorization formalism of non-relativistic QCD at leading order in the
strong-coupling constant alpha_s and the relative velocity v of the bound
quarks. The transverse-momentum distributions of prompt Upsilon(nS)-meson
production measured at the Tevatron are fitted to obtain the non-perturbative
long-distance matrix elements for different choices of un-integrated gluon
distribution functions of the proton.


title:
Physics potential of T2KK: An extension of the T2K neutrino oscillation
  experiment with a far detector in Korea

abstract:
  We study physics potential of placing a far detector in the east coast of
Korea, where the off-axis beam from J-PARC at Tokai village for the T2K project
has significant intensity at a few GeV range. In particular we examine the
capability of determining the mass hierarchy pattern and the CP phase of the
lepton-flavor-mixing matrix when a 100 kt water Cerenkov detector is placed at
various locations in Korea for the off-axis beam (OAB) of 2.5 deg. and 3 deg.
at the Super-Kamiokande site. The best results are found for a combination of 3
deg. OAB at SK (L = 295 km) and 0.5 deg. OAB at L = 1000km, where the mass
hierarchy pattern can be determined at 3-\sigma level for sin^2 2\theta_{RCT}
\simgt 0.05 (0.06) when the hierarchy is normal (inverted), after 5 years of
running (5 \times 10^{21}POT). We also find that the leptonic CP phase,
\delta_{MNS}, can be constrained uniquely, without invoking anti-neutrino
beams, as long as the mass hierarchy pattern is determined. Those results are
obtained by assuming that the charged current quasi-elastic events can be
separated from the other backgrounds with high efficiency, the neutrino energy
can be reconstructed with a hundred MeV uncertainty, and the earth matter
density along the baseline can be determined with 3% accuracy.


title: Stau-catalyzed Nuclear Fusion

abstract:
  We point out that the stau may play a role of a catalyst for nuclear fusions
if the stau is a long-lived particle as in the scenario of gravitino dark
matter. In this letter, we consider d d fusion under the influence of stau
where the fusion is enhanced because of a short distance between the two
deuterons. We find that one chain of the d d fusion may release an energy of
O(10) GeV per stau. We discuss problems of making the stau-catalyzed nuclear
fusion of practical use with the present technology of producing stau.


title: D Mesons in Nuclear Matter: A DN Coupled-Channel Equations Approach

abstract:
  A set of coupled two-body scattering equations is solved for the DN system
embedded in an iso-symmetric nuclear matter. The in-medium behavior of charmed
D mesons: (D^+,D^0), is investigated from the self-consistent solution within
this scheme. The effective meson-baryon Lagrangian in charm quantum number one
sector, the key ingredient in the present study, is adopted from a recent model
by Hofmann and Lutz which has aimed at combining the charmed meson degree of
freedom in a consistent manner with chiral unitary models. After a critical
examination, the original model is modified in several important aspects, such
as the method of regularization, in order to be more consistent and practical
for our objective. The resultant interaction is used to reproduce the position
and width of the s-wave \Lambda_c(2593) resonance in the isospin zero DN
channel. In the isospin one channel, it generates a rather wide resonance at
\~2770 MeV. The corresponding in-medium solution is then sought by
incorporating Pauli blocking and the D- and \pi-meson dressing
self-consistently. At normal nuclear matter density, the resultant \Lambda_c
(2593) is found to stay narrow and shifted at a lower energy, while the I=1
resonance is lowered in position as well and broadened considerably. The
possible implication of our findings on the J/\Psi suppression, etc. in
relativistic heavy ion collisions is briefly discussed.


title:
Extracting |V(ub)| from B->pi l nu Decays Using a Multiply-subtracted
  Omnes Dispersion Relation

abstract:
  We use a multiply-subtracted Omnes dispersion relation for the form factor
f^+ in B->pi semileptonic decay, allowing the direct input of experimental and
theoretical information to constrain its dependence on q^2. Apart from these
inputs we use only unitarity and analyticity properties. We obtain
|V(ub)|=(4.02 \pm 0.35)\times 10^{-3}, improving the agreement with the value
determined from inclusive methods, and competitive in precision with them.


title: Multi-channel Absorption of Photons at Energies above 1 TeV

abstract:
  It is shown that the absorption of photons at energies > 1 TeV (much higher
than the mass of the Higgs boson ~ 100 GeV) is a multi-channel one as opposed
to the purely electron pair like absorption at lower energies. The observation
on muons and gamma rays from Cygnus X-3 point source at these energies (1 TeV
to 10 TeV) is quantitatively accounted for. The expected multi-channel
cross-sections of photons in air as a function of energy is given both for
Coulomb dissociation and nuclear absorption upto limiting energies of 10^9 GeV.


title:
Solution of Dynamical Spontaneous Chiral Symmetry Breaking in Minkowski
  Space, Linearized approximation

abstract:
  Chiral symmetry breaking and mass generation is studied in a vectorial,
confining asymptotic free gauge theory. Using the Schwinger-Dyson equation in
improved ladder approximation, we calculate the fermion propagator in the whole
Minkowski space. The estimate for $f_{\pi}$ and the dependence of physical mass
on a coupling strength is provided. We focus on the extraction of spectral
function of fermion propagator in the strongly coupled regime. Our calculations
indicate that up to the crossover between walking and QCD-like running
dynamics, the real pole of the propagator is not excluded and very likely it is
actually developed at zero temperature theory.


title:
Gravitino Dark Matter Scenarios with Massive Metastable Charged
  Sparticles at the LHC

abstract:
  We investigate the measurement of supersymmetric particle masses at the LHC
in gravitino dark matter (GDM) scenarios where the next-to-lightest
supersymmetric partner (NLSP) is the lighter scalar tau, or stau, and is stable
on the scale of a detector. Such a massive metastable charged sparticle would
have distinctive Time-of-Flight (ToF) and energy-loss ($dE/dx$) signatures. We
summarise the documented accuracies expected to be achievable with the ATLAS
detector in measurements of the stau mass and its momentum at the LHC. We then
use a fast simulation of an LHC detector to demonstrate techniques for
reconstructing the cascade decays of supersymmetric particles in GDM scenarios,
using a parameterisation of the detector response to staus, taus and jets based
on full simulation results. Supersymmetric pair-production events are selected
with high redundancy and efficiency, and many valuable measurements can be made
starting from stau tracks in the detector. We recalibrate the momenta of taus
using transverse-momentum balance, and use kinematic cuts to select
combinations of staus, taus, jets and leptons that exhibit peaks in invariant
masses that correspond to various heavier sparticle species, with errors often
comparable with the jet energy scale uncertainty.


title: Initial States: IR and Collinear Divergences

abstract:
  The standard approach to the infra-red problem is to use the Bloch-Nordsieck
trick to handle soft divergences and the Lee-Nauenberg (LN) theorem for
collinear singularities. We show that this is inconsistent in the presence of
massless initial particles. Furthermore, we show that using the LN theorem with
such initial states introduces a non-convergent infinite series of diagrams at
any fixed order in perturbation theory.


title:
Impact of $\theta_{13}$ on Lepton Flavour Violating processes within
  SUSY Seesaw

abstract:
  We study the impact of neutrino masses and mixings on LFV processes within
the context of the supersymmetric seesaw scenario, where the CMSSM is extended
by three right-handed (s)neutrinos. A hierarchical spectrum is considered for
both heavy and light neutrinos. We systematically analyse the interesting
relation between the leptonic mixing angle $\theta_{13}$ and LFV muon and tau
decays, namely $l_j \to l_i \gamma$ and $l_j \to 3 l_i$, and discuss the
interplay with the other relevant parameters. We require compatibility with low
energy neutrino data, bounds on both LFV decays and charged lepton electric
dipole moments, and impose a successful baryogenesis via thermal leptogenesis.
Particular emphasis is given to the implications that a future $\theta_{13}$
measurement can have on our knowledge of the heavy neutrino sector.


title: Central exclusive production of longlived gluinos at the LHC

abstract:
  We examine the possibility of producing gluino pairs at the LHC via the
exclusive reaction pp -> p+gluino+gluino+p in the case where the gluinos are
long lived. Such long lived gluinos are possible if the scalar super-partners
have large enough masses. We show that it may be possible to observe the
gluinos via their conversion to R-hadron jets and measure their mass to better
than 1% accuracy for masses below 350 GeV with 300/fb of data.


title: The GZK Puzzle and Fundamental Dynamics

abstract:
  The conjecture that the GZK puzzle might be related with nontrivial structure
of the inelastic defect of total cross sections in scattering from nuclei has
been suggested.


title:
A comparison between the detection of gamma rays and positrons from
  neutralino annihilation

abstract:
  We study the indirect detection of neutralino dark matter using positrons and
gamma rays from its annihilation in the galactic halo. Considering the HESS
data as the spectrum constituting the gamma--ray background, we compare the
prospects for the experiments GLAST and PAMELA in a general supergravity
framework with non--universal scalar and gaugino masses. We show that with a
boost factor of about 10, PAMELA will be competitive with GLAST for typical NFW
cuspy profiles.


title:
Effects of non-standard neutrino-electron interactions on relic neutrino
  decoupling

abstract:
  We consider the decoupling of neutrinos in the early Universe in presence of
non-standard neutral current neutrino-electron interactions (NSI). We first
discuss a semi-analytical approach to solve the relevant kinetic equations and
then present the results of fully numerical and momentum-dependent
calculations, including flavor neutrino oscillations. We present our results in
terms of both the effective number of neutrino species (N_eff) and the impact
on the abundance of He-4 produced during Big Bang Nucleosynthesis. We find
that, for NSI parameters within the ranges allowed by present laboratory data,
non-standard neutrino-electron interactions do not essentially modify the
density of relic neutrinos nor the bounds on neutrino properties from
cosmological observables, such as their mass. Nonetheless, the presence of
neutrino-electron NSI may enhance the entropy transfer from electron-positron
pairs into neutrinos instead of photons, up to a value of N_eff=3.12. This is
almost three times the correction to N_eff=3 that appears for standard weak
interactions.


title: The Strong CP Problem and Axions

abstract:
  I describe how the QCD vacuum structure, necessary to resolve the $U(1)_A$
problem, predicts the presence of a P, T and CP violating term proportional to
the vacuum angle $\bar{\theta}$. To agree with experimental bounds, however,
this parameter must be very small $(\bar{\theta} \leq 10^{-9}$). After briefly
discussing some possible other solutions to this, so-called, strong CP problem,
I concentrate on the chiral solution proposed by Peccei and Quinn which has
associated with it a light pseudoscalar particle, the axion. I discuss in
detail the properties and dynamics of axions, focusing particularly on
invisible axion models where axions are very light, very weakly coupled and
very long-lived. Astrophysical and cosmological bounds on invisible axions are
also briefly touched upon.


title:
Implications of R-parity violating supersymmetry for atomic and hadronic
  EDMs

abstract:
  We calculate the electric dipole moments (EDM) of the neutral Hg(199) atom,
deuteron, nucleons and neutral hyperons Lambda, Sigma(0) and Xi(0) in the
framework of a generic SUSY model without R-parity conservation (RPV SUSY) on
the basis of the SU(3) version of chiral perturbation theory (ChPT). We
consider CP-violation in the hadronic sector induced by the chromoelectric
quark dipole moments and CP-violating 4-quark effective interactions. From the
null experimental results on the neutron and Hg(199) atom EDMs we derive limits
on the imaginary parts of certain products Im(lambda' lambda'*) of the
trilinear RPV-couplings and demonstrate that they are more stringent than those
existing in the literature. Using these limits we give predictions for the EDMs
of neutral hyperons.
  We also estimate the prospects of future storage ring experiments on the
deuteron EDM and show that the expected improvement of the above limits in
these experiments may reach several orders of magnitude.


title: LHC / ILC / Cosmology Interplay

abstract:
  There is a strong and growing interplay between particle physics and
cosmology. In this talk, I discuss some aspects of this interplay concerning
dark matter candidates put forth by theories beyond the Standard Model. In
explaining the requirements for collider tests of such dark matter candidates,
I focus in particular on the case of the lightest neutralino in the MSSM.


title:
Complex CKM from Spontaneous CP Violation Without Flavor Changing
  Neutral Current

abstract:
  We analyse the general constraints on unified gauge models with spontaneous
CP breaking that satisfy the conditions that (i) CP violation in the quark
sector is described by a realistic complex CKM matrix, and (ii) there is no
significant flavor changing neutral current effects in the quark sector. We
show that the crucial requirement in order to conform to the above conditions
is that spontaneous CP breaking occurs at a very high scale by complex vevs of
standard model singlet Higgs fields. Two classes of models are found, one
consisting of pure Higgs extensions and the other one involving fermionic
extensions of the standard model. We give examples of each class and discuss
their possible embeddings into higher unified theories. One of the models has
the interesting property that spontaneous CP violation is triggered by
spontaneous P violation, thereby linking the scale of CP violation to the
seesaw scale for neutrino masses.


title: Leptogenesis and low energy CP phases with two heavy neutrinos

abstract:
  An attractive explanation for non-zero neutrino masses and small matter
antimatter asymmetry of the present Universe lies in "leptogenesis". At present
the {\it size} of the lepton asymmetry is precisely known, while the {\it sign}
is not known yet. In this work we determine the sign of this asymmetry in the
framework of two right handed neutrino models by relating the leptogenesis
phase(s) with the low energy CP violating phases appearing in the leptonic
mixing matrix. It is shown that the knowledge of low energy lepton number
violating re-phasing invariants can indeed determine the sign of the present
matter antimatter asymmetry of the Universe and hence indirectly probing the
light physical neutrinos to be Majorana type.


title: Electroweak physics and physics beyond the Standard Model

abstract:
  We summarize the recent results on electroweak physics and physics beyond the
Standard Model that have been presented at the XIV International Workshop on
Deep Inelastic Scattering 2006.


title: Possible CPT Violation from Planck Scale Effects

abstract:
  At present there is good agreement between the neutrino mass-squared
difference determined from the solar neutrino data and the anti-neutrino
mass-squared difference determined from the KamLAND reactor anti-neutrino
experiment. However, the central values of the two cases differ from each other
by about $10^{-5}$ eV$^2$. An improvement in the accuracy of both the solar
neutrino experiments and reactor anti-neutrino experiments can establish the
existence of a non-zero difference between neutrino and anti-neutrino
mass-squared differences and provide a signal for CPT violation. In this paper,
we show how such a difference can arise through the CPT violating neutrino mass
terms from Planck scale physics.


title: Rethinking the QCD collisional energy loss

abstract:
  It is shown that to leading order the collisional energy loss of an energetic
parton in the hot quark gluon plasma reads $dE/dx \sim \alpha(m_D^2)T^2$, where
the scale of the coupling is determined by the (parametrically soft) Debye
screening mass. Compared to previous expressions derived by Bjorken and other
authors, $dE^B/dx \sim \alpha^2 T^2 \ln(ET/m_D^2)$, the rectified result takes
into account the running of the coupling, as dictated by quantum corrections
beyond tree level. As one significant consequence, due to asymptotic freedom,
the QCD collisional energy loss becomes independent of the jet energy in the
limit $E \gg T$. It is advocated that this resummation improved perturbative
result might be useful to (re-)estimate the collisional energy loss for
temperatures relevant in heavy ion phenomenology.


title: Heavy flavour production in DGLAP improved saturation model

abstract:
  The charm and beauty quark production in deep inelastic scattering at low
values of the Bjorken variable x is considered in the DGLAP improved saturation
model. After fitting parameters of the model to the structure function F_2, the
heavy quark contributions Fc_2 and Fb_2 are predicted. A good description of
the data is found. Predictions for the longitudinal structure function F_L and
the diffractive structure function FD_2 are also presented.


title:
Extraction of proton form factors in the timelike region from
  single-polarized e+ e- -> \vec p anti-p events

abstract:
  We have performed numerical simulations of the single-polarized e+ e- -->
\vec p anti p process in kinematic conditions under discussion for a possible
upgrade of the existing DAFNE facility. By fitting the cross section and spin
asymmetry angular distributions with typical Born expressions, we can study the
conditions for extracting information on moduli and phases of the proton
electromagnetic form factors in the timelike region, which are poorly known and
whose preliminary data show puzzling features. We have explored also non-Born
contributions by introducing a further component in the angular fit, which is
related to two-photon exchange diagrams. Using a dipole parametrization, we
show that these corrections can be identified if larger than 5% of the Born
contribution; we also explore the conditions for extracting information on the
phase and, consequently, on the relative weight between their real and
imaginary parts, which are presently unknown.


title: Radiative decays of charmonium into light mesons

abstract:
  We apply perturbative QCD to the radiative decays of charmonia $J/\psi$ and
$\chi_{cJ}$ into light mesons. We perform a complete numerical calculation for
the quark-gluon loop diagrams involved in these processes. The calculated
$J/\psi$ decay branching ratios to P-wave mesons $f_2(1270)$ and $f_1(1285)$
fit the data well, while that of $f_0(980)$ (if treated as an $s\bar s$ meson)
is predicted to be $1.6\times 10^{-4}$, which implies that $f_0(1710)$ can not
be the $s\bar s$ or $(u\bar u+d\bar d)/\sqrt{2}$ meson. Decays of P-wave
charmonia $\chi_{cJ}\to \rho(\omega, \phi)\gamma$ (J=0,1,2) are also studied,
and the branching ratio of $\chi_{c1}\to \rho\gamma$ is predicted to be
$1.4\times 10^{-5}$, which may be tested by CLEO-c and BESIII with future
experiments.


title: Expectations for LHC from Naturalness: Modified vs. SM Higgs Sector

abstract:
  Common lore has it that naturalness of electroweak breaking in the SM
requires new physics (NP) at Lambda < 2-3 TeV, hopefully within the reach of
LHC. Moreover the Higgs should be light (m_h < 219 GeV) to pass electroweak
precision tests (EWPT). However one should be prepared for "unexpected"
(although admittedly unpleasant) results at LHC, i.e. no NP and/or a heavy
Higgs. We revisit recent attempts to accommodate this by modifying the SM Higgs
sector (using 2-Higgs-doublet models). We find that these models do not improve
the naturalness of the SM, and so they do not change the expectations of
observing NP at LHC. We also stress that a heavy SM Higgs would not be evidence
in favour of a modified Higgs sector, provided certain higher order operators
influence EWPT. On the other hand, we show that NP can escape LHC detection
without a naturalness price, and with the pure SM as the effective theory valid
at LHC energies, simply if the cut-off for top loops is slightly lower than for
Higgs loops.


title: Lepton non-universality at LEP and charged Higgs

abstract:
  A recent analysis of the LEP data shows an interesting deviation from lepton
universality in W boson decays. An excess at the level of 2.8 sigma is found in
the tau mode branching ratio with respect to the other two modes. It is
suggested that this seeming lepton non-universality might stem from pair
production of charged Higgs bosons almost degenerate with W, that
preferentially decay to heavy fermions. It is shown that the deviation can be
reduced to 1.4 sigma in two Higgs doublet model I without any conflict with the
existing direct or indirect constraints. This conclusion is largely independent
of tan beta, the ratio of Higgs vacuum expectation values. This scenario can be
tested at the forthcoming international linear collider.


title: Probing Late Neutrino Mass Properties with Supernova Neutrinos

abstract:
  Models of late-time neutrino mass generation contain new interactions of the
cosmic background neutrinos with supernova relic neutrinos (SRNs) through
exchange of the on-shell light boson, leading to significant modification of
the differential SRN flux observed at earth. We consider Abelian U(1) model for
generating neutrino masses at low scales and we show that there is a large
parameter space in this model for which the changes induced in the flux by the
exchange of the light bosons might allow one to distinguish between neutrinos
being Majorana or Dirac particles, the type of neutrino mass hierarchy (normal
or inverted or quasi-degenerate), and could also possibly determine the
absolute values of the neutrino masses. Measurements of the presence of these
effects would be possible at the next-generation water Cerenkov detectors
enriched with Gadolinium, or a large 100 kton liquid argon detector.


title: Precision Tests of Flavor and CP violation in B Decays

abstract:
  Isospin and flavor SU(3) set stringent bounds on penguin pollution in
$B^0(t)\to \rho^+\rho^-$, providing a theoretically precise determination of
$\alpha\equiv \phi_2 $, $\alpha = (91\pm 7_{\rm exp}\pm 3_{\rm th})^\circ$.
Isospin breaking in a sum rule for $B\to K\pi$ rates is shown to be suppressed.
A similar sum rule holds for CP asymmetries in $B\to K\pi$. Violation of these
sum rules would be evidence for an anomalous $\Delta I=1$ piece in ${\cal
H}_{\rm eff}$.


title: Quark-Hadron Duality in Spin Structure Functions g1p and g1d

abstract:
  New measurements of the spin structure functions of the proton and deuteron
g1p(x,Q2) and g1d(x,Q2) in the nucleon resonance region are compared with
extrapolations of target-mass-corrected next-to-leading-order (NLO) QCD fits to
higher energy data. Averaged over the entire resonance region (W<2 GeV), the
data and QCD fits are in good agreement in both magnitude and Q2 dependence for
Q2>1.7 GeV2. This global duality appears to result from cancellations among the
prominent local resonance regions: in particular strong sigma{3/2}
contributions in the Delta(1232) region appear to be compensated by strong
sigma{1/2} contributions in the resonance region centered on 1.5 GeV. These
results are encouraging for the extension of NLO QCD fits to lower W and Q2
than have been used previously.