title:
Explicit Results for the Anomalous Three Point Function and
  Non-Renormalization Theorems

abstract:
  Two-loop corrections for the <VVA> correlator of the singlet axial and vector
currents in QCD are calculated in the chiral limit for arbitrary momenta.
Explicit calculations confirm the non-renormalization theorems derived recently
by Vainshtein and Knecht et.al. We find that as in the one-loop case also at
the two loops the <VVA> correlator has only 3 independent form-factors instead
of 4. From the explicit results we observe that the two-loop correction to the
correlator is equal to the one-loop result times the constant factor C_2(R)
alpha_s/pi in the MSbar scheme. This holds for the full correlator, for the
anomalous longitudinal as well as for the non- anomalous thansversal
amplitudes. The finite overall alpha_s dependent constant has to be normalized
away by renormalizing the axial current according to Witten's
algebraic/geometrical constraint on the anomalous Ward identity. Our
observations, together with known facts, suggest that in perturbation theory
the <VVA> correlator is proportional to the one-loop term to all orders and
that the non- renormalization theorem of the Adler-Bell-Jackiw anomaly carries
over to the full correlator.


title: Have Pentaquark States Been seen?

abstract:
  The status of the search for pentaquark baryons is reviewed in light of new
results from the first two dedicated experiments from CLAS at Jefferson Lab and
of new analyses from several laboratories on the $Theta^+(1540)$. Evidence for
and against two heavier pentaquark states is also discussed.


title:
Spin Polarisability of the Nucleon in the Heavy Baryon Effective Field
  Theory

abstract:
  We have constructed a heavy baryon effective field theory with photon as an
external field in accordance with the symmetry requirements similar to the
heavy quark effective field theory. By treating the heavy baryon and
anti-baryon equally on the same footing in the effective field theory, we have
calculated the spin polarisabilities $\gamma_i, i=1...4$ of the nucleon at
third order and at fourth-order of the spin-dependent Compton scattering. At
leading order (LO), our results agree with the corresponding results of the
heavy baryon chiral perturbation theory, at the next-to-leading order(NLO) the
results show a large correction to the ones in the heavy baryon chiral
perturbation theory due to baryon-antibaryon coupling terms. The low energy
theorem is satisfied both at LO and at NLO. The contributions arising from the
heavy baryon-antibaryon vertex were found to be significant and the results of
the polarisabilities obtained from our theory is much closer to the
experimental data.


title: Higgsino dark matter in partly supersymmetric models

abstract:
  Models where supersymmetry (SUSY) is manifest only in a sector of the
low-energy spectrum have been recently proposed as an alternative to the MSSM.
In these models the electroweak scale is explained by a fine-tuning between
different Higgs mass contributions (split-SUSY models), or by the localization
of the Higgs sector in a point of an extra dimension where all the mass
parameters are suppressed by the metric (partly-SUSY models). Therefore, the
presence of a good dark matter candidate becomes the main motivation for
(partial) low-energy SUSY. We study this issue in minimal frameworks where the
higgsinos are the only light supersymmetric particles. Whereas in split-SUSY
models the higgsino should have a mass around 1 TeV, we show that in
partly-SUSY models the lightest higgsino could also be found below MW.


title:
A Novel Parametrization of tau-lepton Dominance and Simplified One-loop
  Renormalization-group Equations of Neutrino Mixing Angles and CP-violating
  Phases

abstract:
  We point out that the $\tau$-lepton dominance in the one-loop
renormalization-group (RG) equations of neutrino mixing quantities allows us to
set a criterion to choose the most suitable parametrization of the lepton
flavor mixing matrix $U$: its elements $U^{}_{3i}$ (for $i=1,2,3$) should be as
simple as possible. Such a novel parametrization is quite different from the
"standard" one used in the literature and can lead to greatly simplified RG
equations for three mixing angles and the physical CP-violating phase(s) in the
standard model or its minimal supersymmetric extension, no matter whether
neutrinos are Dirac or Majorana particles. Some important features of our
analytical results and their phenomenological consequences are also discussed.


title: QCD Effects in High Energy Processes

abstract:
  In this talk, some important QCD effects in Higgs physics, supersymmetry and
top physics, as well as the factorization and resummation techniques in QCD are
reviewed.


title: Running CP-violating Phases of Majorana Neutrinos

abstract:
  Three CP-violating phases of the $3\times 3$ lepton flavor mixing matrix $V$,
denoted as $\delta$, $\rho$ and $\sigma$ in a useful phase convention, are
entangled with one another in the one-loop renormalization-group equations. We
show that $\delta =90^\circ$ at the electroweak scale ($\Lambda_{\rm EW} \sim
10^{2}$ GeV) can be radiatively generated from $\delta =0^\circ$ at the seesaw
scale ($\Lambda_{\rm SS} \sim 10^{14}$ GeV) in the minimal supersymmetric
standard model, provided three neutrino masses are nearly degenerate. As for
the Majorana phases $\rho$ and $\sigma$, it is also possible to radiatively
generate $\rho =90^\circ$ or $\sigma = 90^\circ$ at $\Lambda_{\rm EW}$ from
$\rho =0^\circ$ or $\sigma = 0^\circ$ at $\Lambda_{\rm SS}$. This observation
opens a new and interesting window for model building, in order to understand
possible connection between the phenomena of CP violation at low- and
high-energy scales.


title: Scaling properties of high p_T inclusive hadron production

abstract:
  We analyze the scaling properties of inclusive hadron production in
proton-proton and in heavy ion collisions from fixed target to collider
energies. At large transverse momentum p_T, the invariant cross section
exhibits a power-like behavior Ed^3\sigma/d^3p\propto p_T^{-n} at fixed
transverse x, x_T=2p_T/\sqrt{s}, and fixed center-of-mass scattering angle
\theta_{cm}. Knowledge of the exponent n allows one to draw conclusions about
the production mechanisms of hadrons, which are poorly known, even at high p_T.
We find that high-p_T hadrons are produced by different mechanisms at
fixed-target and collider energies. For pions, higher-twist subprocesses where
the pion is produced directly dominate at fixed target energy, while
leading-twist partonic scattering plus fragmentation is the most important
mechanism at collider energies. High-p_T baryons on the other hand appear to be
produced by higher-twist mechanisms at all available energies. The higher-twist
mechanism of direct proton production can be verified experimentally by testing
whether high p_T protons are produced as single hadrons without accompanying
secondaries. In addition, we find that medium-induced gluon radiation in heavy
ion collisions can violate scaling.


title:
Unitary and analytic model of nucleon EM structure, the puzzle with JLab
  proton polarization data and new insight into proton charge distribution

abstract:
  The Unitary and analytic model of nucleon electromagnetic structure,
describing all existing nucleon form factor data, is briefly reviewed. Then in
the framework of this model the problem of inconsistency of older proton
electric form factor data in space-like region (obtained from $% e^{-}p\to
e^{-}p$ process by the Rosenbluth technique) with recent Jefferson Lab data on
the ratio $G_{Ep}(t)/G_{Mp}(t)$ (measured in precise polarization
$\overrightarrow{e}^{-}p\to e^{-}\overrightarrow{p}$ experiment) is suggested
to be solved in favour of the latter data which, however, unlike older data
cause an existence of the form factor zero, i.e. a difraction minimum in
$|G_{Ep}(t)|$ around $t=-Q^{2}=-13$GeV$^{2}$. The new behaviour of $G_{Ep}(t)$
with the zero gives modified proton charge distribution with enlarged value of
the mean square charge radius.


title:
Some comments on calculations of the scalar radius of the pion and the
  chiral constant $\bar{l}_4$

abstract:
  The pion scalar radius is given by $<r^2_S>=(6/\pi)\int_{4M^2_\pi}^\infty{\rm
d}t \delta_S(t)/t^2$, with $\delta_S$ the phase of the scalar form factor.
Below $\bar{K}K$ threshold, $\delta_S=\delta_0$, $\delta_0$ being the
isoscalar, S-wave $\pi\pi$ phase shift. Between $\bar{K}K$ threshold and
$t^{1/2}\sim 1.5 {\rm GeV}$
  I argued, in two previous letters, that one can approximate
$\delta_S\sim\delta_0$, because inelasticity is small, compared with the
errors. This gives $<r^2_S>=0.75\pm0.07 {\rm fm}^2$ and the value
$\bar{l}_4=5.4\pm0.5$ for the one-loop chiral perturbation theory constant,
compared with the values given by Leutwyler and collaborators,
  $<r^2_S>=0.61\pm0.04 {\rm fm}^2$ and $\bar{l}_4=4.4\pm0.3$. At high energy,
$t^{1/2}>1.5 {\rm GeV}$, I remarked that the value of $\delta_S$ that follows
from perturbative QCD agrees with my interpolation and disagrees with that of
Leutwyler and collaborators. In a recent article, Caprini, Colangelo and
Leutwyler claim that my estimate of the asymptotic phase $\delta_S$ is
incorrect as it neglects higher twist contributions. Here I remark that, when
correctly calculated, higher twist contributions are likely negligible. I also
show that chiral perturbation theory gives $\bar{l}_4=6.60\pm0.43$, compatible
with my estimate but widely off the value $\bar{l}_4=4.4\pm0.3$ of Leutwyler
and collaborators.


title: Testing Neutrino Mass Models

abstract:
  The existence of the neutrino masses and mixing would be an important window
into the nature of physics beyond the Standard Model, which will be searched
for in the forthcoming experiments such as LHC. In this talk, we discuss some
examples of neutrino mass models which are testable through the observation of
lepton flavor violating processes and/or electric dipole moments correlated
with the neutrino mass structure.


title:
Resummation of Soft Gluon Logarithms in the DGLAP Evolution of
  Fragmentation Functions

abstract:
  We define a general scheme for the evolution of fragmentation functions which
resums both soft gluon logarithms and mass singularities in a consistent manner
and to any order, and requires no additional theoretical assumptions. Using the
Double Logarithmic Approximation and the known perturbative results for the
splitting functions, we present our scheme with the complete contribution from
the double logarithms, being the largest soft gluon logarithms. We show that
the resulting approximation is more complete than the Modified Leading
Logarithm Approximation even with the fixed order contribution calculated to
leading order only, and find, after using it to fit quark and gluon
fragmentation functions to experimental data, that this approximation in our
scheme gives a good description of the data from the largest x_p values to the
peak region in xi=ln (1/x_p), in contrast to other approximations. In addition,
we develop a treatment of hadron mass effects which gives additional
improvements at large xi.


title:
ArDM: a ton-scale liquid Argon experiment for direct detection of Dark
  Matter in the Universe

abstract:
  The ArDM project aims at developing and operating large noble liquid
detectors to search for direct evidence of Weakly Interacting Massive Particle
(WIMP) as Dark Matter in the Universe. The initial goal is to design, assemble
and operate a $\approx$1 ton liquid Argon prototype to demonstrate the
feasibility of a ton-scale experiment with the required performance to
efficiently detect and sufficiently discriminate backgrounds for a successful
WIMP detection. Our design addresses the possibility to detect independently
ionization and scintillation signals. In this paper, we describe this goal and
the conceptual design of the detector.


title:
Fermion masses in E_6 grand unification with family permutation
  symmetries

abstract:
  Neutrino masses have been extensively studied in the context of discrete
symmetries. A family permutation symmetry easily explains all neutrino
oscillations and their mixing angles. However it is not obvious the embedding
of such symmetry in a grand unified theory where all fermions live in the same
representation. We show that it is possible to embed such a horizontal discrete
symmetry in a grand unified theory. We discuss an E_6
  GUT model as in [1], but differently from [1], we take the SM Higgs doublet
in the 351' to have (+3,+5) charges with respect the additional U(1)_r X
U(1)_t. This choice makes possible two different horizontal symmetry breaking
patterns and a distinction between neutrinos and the rest of matter fermions.


title:
Consistency of LEP $Z+b$-jets excess with an {\boldmath $h\to aa$} Decay
  Scenario and Low-Fine-Tuning NMSSM Models

abstract:
  We examine the LEP limits for the $Zh\to Z+b$'s final state and find that the
excess of observed events for $\mh\sim 100\gev$ correlates well with there
being an $\mh\sim 100\gev$ Higgs boson with SM-like $ZZh$ coupling that decays
partly via $h\to b\anti b+\tauptaum$ [with $\br(h\to b\anti b)\sim 0.08$] but
dominantly via $h\to aa$ [with $\br(h\to aa)\sim 0.9$], where $\ma<2\mb$ so
that $a\to \tauptaum$ (or light quarks and gluons) decays are dominant.
Scenarios of precisely this type arise in the Next-to-Minimal Supersymmetric
Model for parameter choices yielding the lowest possible fine-tuning.


title:
Asymptotic expansions of Feynman diagrams and the Mellin-Barnes
  representation

abstract:
  In this talk, we describe part of our recent work \cite{FGdeR05} (see also
\cite{F05,G05}) that gives new results in the context of asymptotic expansions
of Feynman diagrams using the Mellin-Barnes representation.


title: A posteriori inclusion of PDFs in NLO QCD final-state calculations

abstract:
  Any NLO calculation of a QCD final-state observable involves Monte Carlo
integration over a large number of events. For DIS and hadron colliders this
must usually be repeated for each new PDF set, making it impractical to
consider many `error' PDF sets, or carry out PDF fits. Here we discuss ``a
posteriori'' inclusion of PDFs, whereby the Monte Carlo run calculates a grid
(in x and Q) of cross section weights that can subsequently be combined with an
arbitrary PDF. The procedure is numerically equivalent to using an interpolated
form of the PDF. The main novelty relative to prior work is the use of
higher-order interpolation, which substantially improves the tradeoff between
accuracy and memory use. An accuracy of about 0.01% has been reached for the
single inclusive cross-section in the central rapidity region |y|<0.5 for jet
transverse momenta from 100 to 5000 GeV. This method should facilitate the
consistent inclusion of final-state data from HERA, Tevatron and LHC in PDF
fits, thus helping to increase the sensitivity of LHC to deviations from
standard Model predictions.


title: Semi-inclusive hadronic B decays as null tests of the Standard Model

abstract:
  We propose a new set of observables that can be used as experimental null
tests of the Standard Model in charged and neutral B decays. The CP asymmetries
in hadronic decays of charged B mesons into inclusive final states containing
at least one of the following mesons: K_{S,L}, eta', c\bar c bound states or
neutral K^* or D mesons, for all of which a U-spin rotation is equivalent to a
CP conjugation, are CKM suppressed and furthermore vanish in the exact U-spin
limit. We show how this reduces the theoretical error by using Soft Collinear
Effective Theory to calculate the CP asymmetries for K_{S,L} X_{s+d}, K^*
X_{s+d} and eta' X_{s+d} final states in the endpoint region. For these CP
asymmetries only the flavor and not the charge of the decaying B meson needs to
be tagged up to corrections of NLO in 1/m_b, making the measurements more
accessible experimentally.


title: Mu-tau antisymmetry and neutrino mass matrices

abstract:
  Using the seesaw mechanism and a discrete symmetry, we construct a class of
models for the neutrino mass matrix where the inverse of that matrix is the sum
of a mu-tau antisymmetric background and a perturbation. We consider various
possibilities for that perturbation. The simplest possible perturbations lead
to four-parameter neutrino mass matrices which are unable to fit the
experimental data. More complicated perturbations give rise to viable
six-parameter mass matrices; we present detailed predictions of each of them.


title: Small size pentaquark in QCD sum rule approach

abstract:
  The analysis of the sum rules (for two differentchoices of 5-quark currents)
indicate that to explain experimental results it is necessary to have some
one-particle lower state (and pentaquark is a reliable candidate to this state)
while the two-particle coupled lower state ($NK$ system) should be excluded.
Obtained sum rules have good stability and correspond to pentaquark mass
$m_\theta$=1.54 $GeV$ at the appropriate choice of continuum threshold. Also
the features of the sum rules for 2-point correlator with 5-quark currents are
studied. This features should be taken into account to obtain sum rules
correctly.


title:
Generalized Study with Isospin-phased Topological Approach on the $B \to
  K\pi$ Puzzle

abstract:
  We study the decay processes $B \to K \pi$ by using generalized decay
amplitudes with both the final state re-scattering strong phases and the
topological quark diagrammatic strong phases included together as part of
fitting parameters. Using a generalized approach, so called ``isospin phased
topological approach'', for all the currently available data of $B \to K \pi$
decays, we determine the allowed values of the relevant theoretical parameters,
corresponding to the electroweak penguin, the color-suppressed tree
contribution, strong phase differences, etc. In order to find the most likely
values of the parameters in a statistically reliable way, we use the $\chi^2$
minimization technique. We find that the long distance final state
re-scattering, when taken at proper value, can provide a reasonable fit to the
standard model with the perturbative QCD estimated values, and therefore, it is
premature to conclude that it requires new physics to explain the CP violating
$B \to K\pi$ data.


title:
Two-photon decays of vector mesons and dilepton decays of scalar mesons
  in dense matter

abstract:
  Two-photon decays of vector mesons and dilepton decays of scalar mesons which
are forbidden in vacuum and can occur in dense baryonic matter due to the
explicit violation of Lorentz symmetry are described within a quark model of
the Nambu--Jona-Lasinio type. The temperature and chemical potential dependence
of these processes is investigated. It is found that their contribution to the
production of photons and leptons in heavy-ion collisions is enhanced near the
conditions corresponding to the restoration of chiral symmetry. Moreover, in
the case of the a_0 meson and especially the \rho-meson, a resonant behaviour
(an additional amplification) is observed due to the degeneration of \rho and
a_0 masses when a hot hadron matter is approaching a chirally symmetric phase.


title:
Infrared behavior of the dispersion relations in high-temperature scalar
  QED

abstract:
  We investigate the infrared properties of the next-to-leading-order
dispersion relations in scalar quantum electrodynamics at high temperature in
the context of hard-thermal-loop perturbation theory. Specifically, we
determine the damping rate and the energy for scalars with ultrasoft momenta.
We show by explicit calculations that an early external-momentum expansion,
before the Matsubara sum is performed, gives exactly the same result as a late
one. The damping rate is obtained up to fourth order included in the ultrasoft
momentum and the energy up to second order. The damping rate is found sensitive
in the infrared whereas the energy not.


title: Neutrino oscillations: Current status and prospects

abstract:
  I summarize the status of neutrino oscillations from world neutrino
oscillation data with date of October 2005. The results of a global analysis
within the three-flavour framework are presented. Furthermore, a prospect on
where we could stand in neutrino oscillations in ten years from now is given,
based on a simulation of upcoming long-baseline accelerator and reactor
experiments.


title: On the Effective Theory of Low Scale Orientifold String Vacua

abstract:
  The effective field theory of the minimal Low Scale Orientifold Models is
developed. It describes universal features of related orientifold vacua in
string theory. It contains, beyond the Standard Model fields, an MSSM-like
Higgs sector and three anomalous (massive) U(1) gauge bosons. All
renormalizable couplings are included as well as some dimension-five couplings
that are important for anomaly cancellation. The Higgs symmetry breaking
induces mixing between the anomalous U(1) gauge bosons and the photon and
$Z^0$. This mixing as well as the anomaly generated cubic vector boson
couplings is potentially important for discriminating such models from other
theories containing Z's. Some interesting tree-level processes are also
evaluated.


title: Scalar Sector in the Minimal Supersymmetric 3-3-1 model

abstract:
  We consider the minimal supersymmetric extension of the 3-3-1 model and we
study the mass spectra in the scalar sector of this model without the
anti-sextet. We show that all our lighest scalars are in agreement with the
experimental limits.


title: Holographic Model for Hadrons in Deformed AdS5 Background

abstract:
  Several physical quantities of light hadrons are examined by a new
holographic model of QCD, which is the modified version of the one proposed by
Erlich et al. defined on AdS${}_5$. In our model, AdS${}_5$ is deformed by a
non-trivial bulk scalar, this is corresponding to adding the mass term of the
adjoint fermions to the 4d SYM theory dual to the gravity on AdS${}_5$. We find
that this deformation should be taken to be rather small, but its important
effects are also seen.


title: Basics of a photon collider

abstract:
  This small review is devoted to $\gamma\gamma$ collisions including methods
of creating the colliding $\gamma \gamma$ beams of high energy and physical
problems which can be solved or clarified in such collisions. Contents:
  1. Introduction 1.1. The subject 1.2. Interaction of photons in the Maxwell
theory and QED 2. Collisions of equivalent photons at $e^+e^-$ storage rings 3.
Results obtained in virtual $\gamma^*\gamma^*$ collisions 4. Linear $e^{\pm}
e^-$ collider 5. Photon collider on a base of a linear $e^{\pm} e^-$ collider
5.1. Idea of high-energy $\gamma\gamma$ and $\gamma e$ colliders with real
photons 5.2. Scheme of a photon collider 5.3. Compton scattering as a basic
process for $e\to \gamma$ conversion 6. Physics of $\gamma\gamma$ interactions
7. Concluding remarks 7.1. Summary from TESLA TDR 7.2. Prediction of Andrew
Sessler in 1998 7.3. Conclusion of Karl von Weizs\"acker for young physicists


title:
Transverse Momentum Dependent Factorization for Radiative Leptonic Decay
  of B-Meson

abstract:
  With a consistent definition of transverse-momentum-dependent(TMD) light-cone
wave function of $B$-meson, we show that the amplitude of the radiative
leptonic B-decay can be factorized at one-loop level as a convolution with the
wave function and a perturbative coefficient function, combined with a soft
factor. In this TMD factorization, the transverse momenta of partons in the
$B$-meson are taken into account and all soft divergences are contained in the
wave function and the soft factor. The coefficient function is infrared-safe.
The factorization works on a diagram-by-diagram basis and is possible to extend
beyond one loop. With the factorization the large logarithms in the
perturbative function can be simply resummed. Our work shows that the result of
collinear factorization for the decay can be derived from that of TMD
factorization. Therefore, the two factorizations for the case here are simply
related to each other.


title: Soft-gluon effects in WW production at hadron colliders

abstract:
  We consider QCD radiative corrections to WW pair production in hadron
collisions. We perform a calculation that consistently combines next-to-leading
order predictions with soft-gluon resummation valid at small transverse momenta
ptWW of the WW pair. We present results for the ptWW distribution at the LHC up
to (almost) next-to-next-to-leading logarithmic accuracy, and study the effect
of resummation on the charged-lepton distributions. Soft-gluon effects are
typically mild, but they can be strongly enhanced when hard cuts are applied.
The relevant distributions are generally well described by the MC@NLO event
generator.


title:
SU(3) Breaking of Leading--Twist K and K* Distribution Amplitudes - a
  Reprise

abstract:
  We review the status of the leptonic decay constants f_K and
f_K^{\parallel,\perp} of the K and K*, respectively, and the SU(3) breaking
quantities a_1(K) and a_{1}^{\parallel,\perp}(K*), the first Gegenbauer-moments
of the leading-twist distribution amplitudes of K and K*. We obtain new
predictions from QCD sum rules which are relevant for the calculation of K and
K* form factors, for instance T_1^{B->K*}, which determines the decay B -> K*
gamma, and for QCD factorisation calculations of nonleptonic B decays into
strange mesons, for instance B -> K pi.


title: Effects of Universal Extra Dimensions on Higgs signals at LHC

abstract:
  A major focus at the Large Hadron Collider (LHC) will be Higgs boson studies
and it would be an interesting prospect to simultaneously probe for physics
beyond the Standard Model (SM) in the Higgs signals. In this work we show as to
what extent, the effects of Universal Extra Dimension (UED) can be isolated at
the LHC through the Higgs signals. By doing a detailed study of the different
uncertainties involved in the measurement of the rates for the process pp --> h
--> gamma gamma we estimate the extent to which these uncertainties can mask
the effects of the contributions coming from UED.


title: Leptonic Dark Energy and Baryogenesis

abstract:
  We consider a baryogenesis scenario, where the difference of baryon (B) and
lepton (L) number is conserved in such a way that the B-L asymmetry in the
standard model sector is compensated by an asymmetry of opposite sign stored in
the dark energy sector. Therefore, we introduce a toy-model in which a complex
quintessence field carries a B-L asymmetry at late times. We determine the
produced baryon asymmetry in the visible sector for a large range of initial
conditions and find it easy to achieve a value of the observed order of
magnitude. While the size of the produced baryon asymmetry depends on details
of the underlying inflationary model, it turns out to be independent of the
reheating temperature in many cases. We also discuss possible sources of
instability like the formation of Q-Balls.


title:
Extremely energetic cosmic neutrinos: Opportunities for astrophysics,
  particle physics, and cosmology

abstract:
  Existing and planned observatories for cosmic neutrinos open up a huge window
in energy from 10^7 to 10^17 GeV. Here, we discuss in particular the
possibilities to use extremely energetic cosmic neutrinos as a diagnostic of
astrophysical processes, as a tool for particle physics beyond the Standard
Model, and as a probe of cosmology.


title:
Sivers effect in semi-inclusive deeply inelastic scattering and
  Drell-Yan

abstract:
  The Sivers function is extracted from HERMES data on single spin asymmetries
in semi-inclusive deeply inelastic scattering. The result is used for making
predictions for the Sivers effect in the Drell-Yan process.


title:
Calculating the gauge-invariant two-point correlation function of
  gluonic field strengths

abstract:
  The two-point gauge-invariant correlation function of gluonic field
strengths, which is the main input in the stochastic vacuum model, is derived
by using its relation to the Green functions of one- and two-gluon gluelumps.
These Green functions are found by evaluating the path integrals of one and two
gluons confined in the field of an infinitely heavy adjoint source. This allows
one to obtain also the terms in the exponential asymptotics of the two-point
correlation function, which are produced by fluctuations of the gluons around
their mean separation from the source. The pre-exponents are derived as well,
demonstrating some novel dependences on the distance.


title:
The role of noise and dissipation in the hadronization of the
  quark-gluon plasma

abstract:
  We discuss the role of noise and dissipation in the explosive spinodal
decomposition scenario of hadron production during the chiral transition after
a high-energy heavy ion collision. We use a Langevin description inspired by
nonequilibrium field theory to perform real-time lattice simulations of the
behavior of the chiral fields. Preliminary results for the interplay between
additive and multiplicative noise terms, as well as for non-Markovian
corrections, are also presented.


title: On the limiting behaviour of hard processes in QCD at small x

abstract:
  At sufficiently small $x$ where pQCD methods become insufficient we rewrote
sum of dominant Feynman diagrams for single-scale hard processes in the form of
the effective field theory where a quasiparticle corresponds to pQCD ladder. We
explain that pQCD series are divergent at small $x$ since pQCD produces tachyon
in effective field theory and because of degeneracy of vacua . Within the WKB
approximation we found the hierarchy among quasiparticle interactions due to
smallness of the QCD coupling constant which justifies restriction by the
triple quasiparticle interaction in the Lagrangean of effective field theory.
  Degeneracy of vacua is removed by accounting for the classical solutions
-kinks which cannot be decomposed into series over powers f $\alpha_s$ but
describe color inflation, Bose-Einstein condensation of quasiparticles. Quantum
fluctuations around the WKB solution lead to the spontaneous violation of
two-dimensional translation symmetry and the appearance of zero modes-
``phonons'' which are relevant for the black disc behaviour of small x
processes. Account of gluon exchanges between overlapping ladders neglected in
the first approximation produces a color network occupying a "macroscopic"
longitudinal volume. We discuss briefly possible role of new
  QCD phenomena in the two-scale hard processes .


title: Renormalons and the Renormalization Scheme

abstract:
  The possibility is discussed that existence of renormalon singularities is
not the internal property of the specific field theory but depends on the
renormalization scheme.


title: Neutrino emission and cooling rates of spin-one color superconductors

abstract:
  Neutrino emissivities due to direct Urca processes of several spin-one
color-superconducting phases of dense quark matter are calculated. In
particular, the role of anisotropies and nodes of the gap functions is
analyzed. Results for the specific heat as well as for the cooling rates of the
color-spin-locked, planar, polar, and {\it A} phases are presented and
consequences for the physics of neutron stars are briefly discussed.
Furthermore, it is shown that the {\em A} phase exhibits a helicity order,
giving rise to a reflection asymmetry in the neutrino emissivity.

categories: hep-ph astro-ph cond-mat.supr-con nucl-th


title:
Use of W-Boson Longitudinal-Transverse Interference in Top Quark
  Spin-Correlation Functions: II

abstract:
  This continuation of the derivation of general beam-referenced stage-two
spin-correlation functions is for the analysis of top-antitop pair-production
at the Tevatron and at the Large Hadron Collider. Both the gluon-production and
the quark-production contributions are included for the
charged-lepton-plus-jets reaction p p or p bar{p} --> t bar{t} --> (W^+ b)(W^-
bar{b}) --> (l^{+} nu b)(W^- bar{b}). There is a simple 4-angle beam-referenced
spin-correlation function for determination of the relative sign of, or for
measurement of a possible non-trivial phase between the two dominant helicity
amplitudes for t --> W^{+} b decay. There is an analogous function and tests
for bar{t} --> W^{-} bar{b} decay. This signature requires use of the (t
bar{t}) c.m.-energy of the hadronically decaying W-boson, or the kinematically
equivalent cosine of the polar-angle of W-boson emission in the anti-top (top)
decay frame. Spinors and their outer-products are constructed so that the
helicity-amplitude phase convention of Jacob & Wick can be used throughout for
the fixing of the signs associated with this large W-boson
longitudinal-transverse interference effect.


title: Effective degrees of freedom of the Quark-Gluon Plasma

abstract:
  The effective degrees of freedom of the Quark-Gluon Plasma are studied in the
temperature range $\sim 1-2$ $ T_c$. Employing lattice results for the pressure
and the energy density, we constrain the quasiparticle chiral invariant mass to
be of order 200 MeV and the effective number of bosonic resonant states to be
at most of order $\sim 10$. The chiral mass and the effective number of bosonic
degrees of freedom decrease with increasing temperature and at $T \sim 2$ $T_c$
only quark and gluon quasiparticles survive. Some remarks regarding the role of
the gluon condensation and the baryon number-strangeness correlation are also
presented.


title: Monojet and Single Photon Signals from Universal Extra Dimensions

abstract:
  The usual universal extra dimensions scenario does not allow for single
production of first level Kaluza-Klein (KK) excitations of matter due to the KK
number conservation. However, if the matter fields are localized on a fat brane
embedded in a higher dimensional space, matter-gravitation interactions violate
KK number, and the production of single KK excitations becomes possible. In
this paper we analyze the production of a single KK matter excitation together
with a graviton in the final state, and study the potential for discovery at
the Tevatron and Large Hadron Collider.


title:
Space-time curvature coupling of spinors in early universe: Neutrino
  asymmetry and a possible source of baryogenesis

abstract:
  It is well known that when a fermion propagates in curved space-time, its
spin couples to the curvature of background space-time. We propose that this
interaction for neutrinos propagating in early curved universe could give rise
to a new set of dispersion relations and then neutrino asymmetry at
equilibrium. We demonstrate this with the Bianchi models which describe the
homogeneous but anisotropic and axially symmetric universe. If the lepton
number violating processes freeze out at 10^{-37} second when temperature T ~
10^{15} GeV, neutrino asymmetry of the order of 10^{-10} can be generated. A
net baryon asymmetry of the same magnitude can thus be generated from this
lepton asymmetry either by a GUT B-L symmetry or by the electro-week sphaleron
processes which have B+L symmetry.


title: Infrared instability from nonlinear QCD evolution

abstract:
  Using the Balitsky-Kovchegov (BK) equation as an explicit example, we show
that nonlinear QCD evolution leads to an instability in the propagation toward
the infrared of the gluon transverse momentum distribution, if one starts with
a state with an infrared cut-off. This effect takes the mathematical form of
rapidly moving traveling wave solutions of the BK equation, which we
investigate by numerical simulations. These traveling wave solutions are
different from those governing the transition to saturation, which propagate
towards the ultraviolet. The infrared wave speed, formally infinite for the
leading order QCD kernel, is determined by higher order corrections. This
mechanism could play a role in the rapid decrease of the mean free path in the
Color Glass Condensate scenario for heavy ion collisions.


title:
An SO(10) GUT Model With Lopsided Mass Matrix and Neutrino Mixing Angle
  theta_13

abstract:
  An alternative supersymmetric SO(10) grand unification model with lopsided
fermion mass matrices is introduced. It generates a large solar-neutrino-mixing
angle through the neutrinos' Dirac mass matrix constrained by the SO(10) group
structure, avoiding the fine-tuning required in the Majorana mass matrix of
right-handed neutrinos. The model fits well the known data on masses and
mixings of quarks and leptons, and predicts a sizable lepton mixing
$\sin^22\theta_{13}\simeq 0.074$, which is significantly larger than that of
the original lopsided model.


title: Signals of Z' boson in the Bhabha process within the LEP2 data set

abstract:
  The LEP2 data set on the Bhabha process is analyzed with the aim to detect
the signals of the heavy virtual Z' gauge bosons. The state interacting with
the left-handed standard-model doublets and called the Chiral Z' is
investigated. This particle was introduced already as the low-energy state
allowed by the renormalizability of the model. The contribution of the Chiral
Z' state to the Bhabha process is described by two parameters: the coupling to
electrons and the Z-Z' mixing angle. The sign-definite one-parameter observable
is proposed to measure the Z' coupling to the electron current. The
one-parameter fit of the data shows no signals of the particle. The alternative
two-parameter fit of the differential cross-sections is also performed. It also
shows no Chiral Z' signals. The comparisons with other fits are discussed.


abstract:
  A very simple empirical neutrino mass formula is found, implying the mass
proportion $m_1 : m_2 : m_3 = 1 : 4 : 24(1-\beta^2)$. For the value $\beta =
(5-1)(5-3)/5^2 = 8/25$ the formula predicts precisely $\Delta m^2_{21} \sim
8.0\times 10^{-5} {\rm eV}^2$ in consistency with the experiment, when the
input of experimental estimate $\Delta m^2_{32} \sim 2.4\times 10^{-3} {\rm
eV}^2$ is applied. Plausible interpretation of numerical elements building up
this formula is briefly described.


title: Invariant mass distributions in cascade decays

abstract:
  We derive analytical expressions for the shape of the invariant mass
distributions of massless Standard Model endproducts in cascade decays
involving massive New Physics (NP) particles, D -> Cc -> Bbc -> Aabc, where the
final NP particle A in the cascade is unobserved and where two of the particles
a, b, c may be indistinguishable. Knowledge of these expressions can improve
the determination of NP parameters at the LHC. The shape formulas are
composite, but contain nothing more complicated than logarithms of simple
expressions. We study the effects of cuts, final state radiation and detector
effects on the distributions through Monte Carlo simulations, using a
supersymmetric model as an example. We also consider how one can deal with the
width of NP particles and with combinatorics from the misidentification of
final state particles. The possible mismeasurements of NP masses through `feet'
in the distributions are discussed. Finally, we demonstrate how the effects of
different spin configurations can be included in the distributions.


title:
On Influence of Intensive Stationary Electromagnetic Field on the
  Behavior of Fermionic Systems

abstract:
  Exact solutions of Schroedinger and Pauli equations for charged particles in
an external stationary electromagnetic field of an arbitrary configuration are
constructed. Green functions of scalar and spinor particles are calculated in
this field. The corresponding equations for complex energy of particles bounded
by short range potential are deduced. Boundary condition typical for delta -
potential is not used in the treatment. Explicit analytical expressions are
given for the shift and width of a quasistationary level for different
configurations of the external field. The critical value of electric field in
which the idea of quasistationary level becomes meaningless is calculated. It
is shown that the common view on the stabilizing role of magnetic field
concerns only scalar particles.


title:
Signatures of the Color Glass Condensate in J/Psi production off nuclear
  targets

abstract:
  We consider the J/Psi production in proton (deuteron) -- nucleus collisions
at high energies. We argue that the production mechanism in this case is
different from that in pp collisions due to gluon saturation in the nucleus and
formation of the Color Glass Condensate. At forward rapidities (in the proton
fragmentation region), the production of J/Psi is increasingly suppressed both
as a function of rapidity and centrality. On the other hand, at backward
rapidities at RHIC (in the fragmentation region of the nucleus) the coherent
effects lead to a modest enhancement of the production cross section, with the
nuclear modification factor R(J/Psi) increasing with centrality. We find that
the J/Psi production cross section exhibits at forward rapidities the limiting
fragmentation scaling established previously for soft processes; in the energy
range studied experimentally, it manifests itself as an approximate "xF
scaling".


title: Including Cahn and Sivers effects into event generators

abstract:
  It is demonstrated that event generators LEPTO and PYTHIA can be modified to
describe some azimuthal modulations. The comparisons of results obtained with
modified LEPTO with existing data in the current fragmentation region of SIDIS
are presented for Cahn and Sivers effects as well as the predictions for the
target fragmentation region. The predictions for Sivers effect in the
Drell--Yan process obtained with modified PYTHIA are also presented. The
concept of hadronization function is discussed.


title: Muon pair production in relativistic nuclear collisions

abstract:
  The exclusive production of one $\mu^+\mu^-$ pair in collisions of two
ultra-relativistic nuclei is considered. We present the simple method for
calculation of the Born cross section for this process. Then we found that the
Coulomb corrections to this cross section (which correspond to multi-photon
exchange of the produced $\mu^{\pm}$ with nuclei) are small while the unitarity
corrections are large. This is in sharp contrast to the exclusive $e^+e^-$ pair
production where the Coulomb corrections to the Born cross section are large
while the unitarity corrections are small. We calculated also the cross section
for the production of one $\mu^+\mu^-$ pair and several $e^+e^-$ pairs in the
leading logarithmic approximation. Using this cross section we found that the
inclusive production of $\mu^+\mu^-$ pair coincides in this approximation with
its Born value.


title:
On extrapolations below the Planck scale in models with Lorentz symmetry
  violation (I)

abstract:
  Most current models of Lorentz symmetry violation (LSV) at the Planck scale
involve power-like extrapolations of the Lorentz-beaking term down to
accelerator and even much lower energies. It is therefore assumed that no
intermediate energy scale alters this behaviour. But this is not the only
possible scenario: a more sophisticate energy-dependence is possible, and would
even be natural, involving significant effective thresholds at intermediate
energies. Such thresholds may exist between the Planck scale and the highest
cosmic-ray energies, or between ultra-high cosmic-ray energies and the TeV
scale, leading to interesting scenarios. In many cases, experimental
predictions of LSV patterns can be dramatically modified and space experiments
become necessary irrespective of AUGER results. By combining both kinds of
experiments, future results of cosmic-ray observations will hopefully be able
to test, for a large family of models involving various patterns of
Planck-scale physics, the possible existence of an absolute local rest frame in
the real world.


title: Production of a Z boson and two jets with one heavy-quark tag

abstract:
  We present a next-to-leading-order calculation of the production of a Z boson
with two jets, one or more of which contains a heavy quark (Q=c,b). We show
that the cross section with only one heavy-quark jet is larger than that with
two heavy-quark jets at both the Fermilab Tevatron and the CERN LHC. These
processes are the dominant irreducible backgrounds to a Higgs boson produced in
association with a Z boson, followed by h->bb. Our calculation makes use of a
heavy-quark distribution function, which resums collinear logarithms and makes
the next-to-leading-order calculation tractable.


title:
Resolved photon and multi-component model for $\gamma^*$p and $\gamma^*
  \gamma^*$ total cross section

abstract:
  We generalize our previous model for $\gamma^* p$ scattering to $\gamma
\gamma$ scattering. Performing a new simultaneous fit to $\gamma^* p$ and
$\gamma \gamma$ total cross section we find an optimal set of parameters to
describe both processes. We propose new measures of factorization breaking for
$\gamma^* \gamma^*$ collisions and present results for our new model.


title: Impact of Nucleon Mass Shift on the Freeze Out Process

abstract:
  The freeze out of a massive nucleon gas through a finite layer with time-like
normal is studied. The impact of in-medium nucleon mass shift on the freeze out
process is investigated. A considerable modification of the thermodynamical
variables temperature, flow-velocity, energy density and particle density has
been found. Due to the nucleon mass shift the freeze out particle distribution
functions are changed noticeably in comparison with evaluations, which use
vacuum nucleon mass.


title: HADRON05 Summary: Heavy Quark Hadrons and Theory

abstract:
  This HADRON05 summary covers the topics of (1) mesons containing heavy
quarks, and (2) theory. The new material discussed here is taken mainly from
plenary presentations. We specifically emphasize new or recent results in
spectroscopy that are likely to appear in future editions of the PDG. An
exception is made for the pentaquark, which has now been withdrawn. We
undoubtedly have something important to (re)learn about multiquarks from the
pentaquark saga, and this merits a phrase in Portuguese. The three general
areas we consider are: I. QQbar spectroscopy, II. Qqbar spectroscopy, and III.
lessons from the pentaquark. Finally, in Section IIIb. we conclude with "Our
moment of Zen".


title: Fully Radiative Electroweak Symmetry Breaking

abstract:
  Models of Gauge-Higgs unification in extra dimensions offer a very elegant
playground where one can study electroweak symmetry breaking. The nicest
feature is that gauge symmetry itself protects the Higgs potential from
divergences, thus potentially curing the hierarchy problem in the Standard
Model. In a flat space model tree-level contributions to electroweak precision
observables will be absent due to the flatness of the gauge and Higgs wave
functions. The Higgs potential is fully radiatively generated and the
contribution of bulk fermions will induce a vacuum expectation value. A generic
problem is that the quartic scalar coupling is too low, resulting in a Higgs
VEV that is too close to the compactification scale, and a Higgs mass that is
too light. In this paper we show that it is possible to solve these problems in
a minimal scenario by cancellations in the Higgs potential between the
contribution of different bulk fermions. A crucial role is played by
antiperiodic fermions: the cancellation is not the result of a fine tuning, but
rather dictated by the choice of representations and parities of the fermions.
We also show that introducing a relatively large representation can help in
achieving a sufficiently heavy top. In this case, the strong coupling scale is
lowered to a marginally acceptable value, and a more careful analysis of two
loop effects should decide if the theory remains under perturbative control.


title:
All orders transport theory from the multiple scattering expansion of
  the self-energy: the central cuts

abstract:
  We use the full multiple scattering expansion of the retarded self-energy to
obtain the gain and loss rates present in the Kadanoff-Baym relativistic
transport equation. The rates we obtain include processes with any number of
particles. As a first approximation, we only consider central cuts in the
self-energies, but otherwise our results are general. We specialize to the case
of scalar field theory to compare with lowest order results. The main
application of this work is relativistic transport theory of very dense
systems, such as the quark-gluon plasma or the early universe, where
multi-particle interactions are important.


title: Cooling of Neutron Stars with Color Superconducting Quark Cores

abstract:
  We show that within a recently developed nonlocal chiral quark model the
critical density for a phase transition to color superconducting quark matter
under neutron star conditions can be low enough for these phases to occur in
compact star configurations with masses below 1.3 M_sun. We study the cooling
of these objects in isolation for different values of the gravitational mass
and argue that, if the quark matter phase would allow unpaired quarks, the
corresponding hybrid stars would cool too fast. The comparison with
observational data puts tight constraints on possible color superconducting
quark matter phases. Possible candidates with diquark gaps of the order of 10
keV - 1 MeV such as the "2SC+X" and the color spin locking (CSL) phase are
presented.


title:
Gauge invariance properties and singularity cancellations in a modified
  PQCD

abstract:
  The gauge-invariance properties and singularity elimination of the modified
perturbation theory for QCD introduced in previous works, are investigated. The
construction of the modified free propagators is generalized to include the
dependence on the gauge parameter $\alpha $. Further, a functional proof of the
independence of the theory under the changes of the quantum and classical
gauges is given. The singularities appearing in the perturbative expansion are
eliminated by properly combining dimensional regularization with the Nakanishi
infrared regularization for the invariant functions in the operator
quantization of the $\alpha$-dependent gauge theory. First-order evaluations of
various quantities are presented, illustrating the gauge invariance-properties.


title: Retardation Terms in The One-Gluon Exchange Potential

abstract:
  It is pointed out that the retardation terms given in the original
Fermi-Breit potential vanish in the center of mass frame. The retarded
one-gluon exchange potential is rederived in this paper from the
three-dimensional one-gluon exchange kernel which appears in the exact
three-dimensional relativistic equation for quark-antiquark bound states. The
retardation part of the potential given in the approximation of order $p^2/m^2$
is shown to be different from those derived in the previous literature. This
part is off-shell and does no longer vanish in the center of mass frame.


title: Gluon shadowing and unitarity effects

abstract:
  New data from HERA experiment on deep inelastic scattering have been used to
parametrize nucleon and Pomeron structure functions. Within the Gribov theory,
the parameterizations were employed to calculate gluon shadowing for various
heavy ions. The latter was compared with predictions from other models.
Calculations of multiplicity reduction due to gluon shadowing for d+Au
collisions at forward rapidities at $\sqrt{s}$=200 GeV are in good agreement
with BRAHMS data on the nuclear modification factor.


title:
Exact-propagator instantaneous Bethe-Salpeter equation for
  quark-antiquark bound states

abstract:
  Recently, an instantaneous approximation to the Bethe-Salpeter formalism for
the analysis of bound states in quantum field theory has been proposed which
retains, in contrast to the Salpeter equation, as far as possible the exact
propagators of the bound-state constituents, extracted nonperturbatively from
Dyson-Schwinger equations or lattice gauge theory. The implications of this
improvement for the solutions of this bound-state equation, that is, the
spectrum of the mass eigenvalues of its bound states and the corresponding wave
functions, when considering the quark propagators arising in quantum
chromodynamics are explored.


title: A Model of Electroweak Symmetry Breaking from a Fifth Dimension

abstract:
  We reconsider the idea of identifying the Higgs field as the internal
component of a gauge field in the flat space R^4XS^1/Z_2, by relaxing the
constraint of having unbroken SO(4,1) Lorentz symmetry in the bulk. In this
way, we show that the main common problems of previous models of this sort,
namely the prediction of a too light Higgs and top mass, as well as of a too
low compactification scale, are all solved. We mainly focus our attention on a
previously constructed model. We show how, with few minor modifications and by
relaxing the requirement of SO(4,1) symmetry, a potentially realistic model can
be obtained with a moderate tuning in the parameter space of the theory. In
this model, the Higgs potential is stabilized and the hierarchy of fermion
masses explained.


title: Searching for new physics in bottomonium decays

abstract:
  Heavy quarkonium decays can be used to search for New Physics beyond the
Standard Model. In particular, a light Higgs boson could induce a slight (but
observable) lepton universality breaking in Upsilon decays. In fact, current
experimental data from CLEO presented in this Conference seem to point out to
this direction within experimental accuracy. Moreover, LEP constraints on a
light Higgs mass can be evaded by different models (like MSSM with a CPV Higgs
sector) as shown in this Conference. We also consider spectroscopic
consequences stemming from a possible mixing between Higgs and bottomonium
states leading to discrepancies with the SM expectations (e.g. hyperfine
splittings).


title: Pressure of the Standard Model at High Temperatures

abstract:
  We compute the pressure of the standard model at high temperatures in the
symmetric phase to three loops, or to O(g^5) in all coupling constants. We find
that the terms of the perturbative expansion in the SU(2) + Higgs sector
decrease monotonically with increasing order, but the large values of the
strong coupling constant g_s and the Yukawa coupling of the top quark g_Y make
the expansion in the full theory converge more slowly. The final result is
observed to be about 10% smaller than the ideal gas pressure commonly used in
cosmological calculations.


title: Chiral-odd generalized parton distributions in constituent quark models

abstract:
  We derive the overlap representation of chiral-odd generalized parton
distributions using the Fock-state decomposition in the transverse-spin basis.
This formalism is applied to the case of light-cone wave functions in a
constituent quark model. Numerical results for the four chiral-odd generalized
parton distributions at the hadronic scale are shown in different kinematics.
In the forward limit we derive the transversity distribution, the tensor charge
and the angular momentum sum rule for quarks with transverse polarization in an
unpolarized nucleon.


title: Charm in cosmic rays (The long-flying component of EAS cores)

abstract:
  Experimental data on cosmic ray cascades with enlarged attenuation lengths
(Tien-Shan effect) are presented and analyzed in terms of charm
hadroproduction. The very first estimates of charm hadroproduction cross
sections from experimental data at high energies are confirmed and compared
with recent accelerator results.


title: The Forward-Backward Asymmetry in the $B \to \pi\ell^+\ell^-$ Decay

abstract:
  Using the most general effective Hamiltonian comprising scalar,vector and
tensor type interactions, we have written the branching ratio, the
forward-backward (FB) asymmetry and the normalized FB asymmetry as functions of
the new Wilson coefficients. It is found that the branching ratio depends on
all new coefficients,but the dependence of asymmetries on coefficients could be
analyzed only for one Wilson coefficient.


title: Uncertanties in Air-showers from Small-x pQCD Mini-Jets

abstract:
  To investigate uncertainties in air shower simulations caused by the small-x
regime, a model including leading-twist hard pQCD plus soft processes was
built, which are separated by an energy dependent transverse momentum cut-off.
We provide a fit of the cut-off to the total pp cross section for different
PDFs using the eikonal formalism and show that for modern PDF sets there is
only a small uncertainty in the mini-jet cross section, and hence in the
final-state multiplicity and the number of produced muons.


title:
Non-perturbative renormalization of Phi-derivable approximations in
  theories with multiple fields

abstract:
  We provide a renormalization procedure for Phi-derivable approximations in
theories coupling different types of fields. We illustrate our approach on a
scalar phi^4 theory coupled to fermions via a Yukawa-like interaction. The
non-perturbative renormalization amounts to fixing the scalar coupling via a
set of nested Bethe-Salpeter equations coupling fermions to scalars.


title: Quasiparticle Picture of Quarks near Chiral Phase Transition

abstract:
  We study how the quasiparticle picture of the quark can be modified near but
above the critical tempearture (Tc) of the chiral phase transition; we
incorporate into the quark self-energy the effects of the precursory soft modes
of the phase transition, i.e., `para-\sigma(\pi) meson'. It is found that the
quark spectrum has a three-peak structure near Tc: We show that the additional
new spectra originate from the mixing between a quark (anti-quark) and an
anti-quark hole (quark hole) caused by a ``resonant scattering'' of the
quasi-fermions with the thermally-excited soft modes.


title:
Novel evaluation of the two-pion contribution to the nucleon isovector
  form factors

abstract:
  We calculate the two-pion continuum contribution to the nucleon isovector
spectral functions drawing upon the new high statistics measurements of the
pion form factor by the CMD-2, KLOE, and SND collaborations. The general
structure of the spectral functions remains unchanged, but the magnitude
increases by about 10%. Using the updated spectral functions, we calculate the
contribution of the two-pion continuum to the nucleon isovector form factors
and radii. We compare the isovector radii with simple rho-pole models and
illustrate their strong underestimation in such approaches. Moreover, we give a
convenient parametrization of the result for use in future form factor
analyses.


title: QCD Pomerons at Non-Zero Temperature

abstract:
  We consider the QCD scattering amplitudes at high energies sqrt{s} and fixed
momentum transfers sqrt{-t} in the leading logarithmic approximation at a
non-zero temperature T in the t-channel. It is shown that the BFKL Hamiltonian
has the property of holomorphic separability. The holomorphic Hamiltonian for
n-reggeized gluons at temperature T is shown to be obtained from the T=0
Hamiltonian by an unitary transformation. The connection with field
quantization in accelerated frames and black hole backgrounds is discussed. The
effect of the running of alpha_{QCD} on the pomeron eigenvalues is
investigated.


title: Hadronic eta and eta-prime decays

abstract:
  The hadronic decays eta, eta-prime -> 3 pi and eta-prime -> eta pi pi are
investigated within the framework of U(3) chiral effective field theory in
combination with a relativistic coupled-channels approach. Final state
interactions are included by deriving s- and p-wave interaction kernels for
meson-meson scattering from the chiral effective Lagrangian and iterating them
in a Bethe-Salpeter equation. Very good overall agreement with currently
available data on decay widths and spectral shapes is achieved.


title: Electroweak Symmetry Breaking Circa 2005

abstract:
  Recent progress in both the theoretical and experimental explorations of
electroweak symmetry breaking is surveyed.


title: Jet-medium interactions: wakes in the QCD medium

abstract:
  We calculate the wake induced in a hot, dense QCD medium by a fast parton in
the framework of linear response theory. We discuss two different scenarios:
(i) a weakly coupled quark gluon plasma (pQGP) described by hard-thermal loop
(HTL) perturbation theory and (ii) a scenario where the plasma has the
properties of a quantum liquid. We show that Mach cones can appear in the
second scenario, but not in the first one.


title: Meson decay in the Fock-Tani Formalism

abstract:
  The Fock-Tani formalism is a first principle method to obtain effective
interactions from microscopic Hamiltonians. Usually this formalism was applied
to scattering, here we introduced it to calculate partial decay widths for
mesons.


title: Tensors Mesons in AdS/QCD

abstract:
  We explore tensor mesons in AdS/QCD focusing on f2 (1270), the lightest
spin-two resonance in QCD. We find that the f2 mass and the partial width for
f2 -> gamma gamma are in very good agreement with data. In fact, the
dimensionless ratio of these two quantities comes out within the current
experimental bound. The result for this ratio depends only on Nc and Nf, and
the quark and glueball content of the operator responsible for the f2; more
importantly, it does not depend on chiral symmetry breaking and so is both
independent of much of the arbitrariness of AdS/QCD and completely out of reach
of chiral perturbation theory. For comparison, we also explore f2 -> pi pi,
which because of its sensitivity to the UV corrections has much more
uncertainty. We also calculate the masses of the higher spin resonances on the
Regge trajectory of the f2, and find they compare favorably with experiment.


title: IceHEP High Energy Physics at the South Pole

abstract:
  With the solar and SN87 neutrino observations as proofs of concepts, the
kilometer-scale neutrino experiment IceCube will scrutinize its data for new
particle physics. In this paper we review the prospects for the realization of
such a program. We begin with a short overview of the detector response and
discuss the reach of ``beam'' luminosity. After that we discuss the potential
of IceCube to probe deviations of neutrino-nucleon cross sections from the
Standard Model predictions at center-of-mass energies well beyond those
accessible in man-made accelerators. Then we review the prospects for extremely
long-baseline analyses and discuss the sensitivity to measure tiny deviations
of the flavor mixing angle, expected to be induced by quantum gravity effects.
Finally we discuss the potential to uncover annihilation of dark matter
particles gravitationally trapped at the center of the Sun, as well as
processes occurring in the early Universe at energies close to the Grand
Unification scale.


title: In-Medium formation of J/Psi as a probe of charm quark thermalization

abstract:
  Charmonium formation via charm quark in-medium recombination in heavy ion
interactions at collider energies has the potential to probe some properties of
the medium by utilizing the sensitivity of the recombination process to the
momentum distribution of the quarks. We have examined the transverse momentum
spectra of J/Psi, characterized by <p_T^2>, which result from the formation
process in which the charm quark distributions are unchanged from their initial
production in a pQCD process. This is contrasted with the case in which the
charm quarks have completely come into thermal equilibrium with an expanding
medium whose properties are determined by the spectra of produced light
hadrons. We find that the resulting <p_T^2> of the formed J/Psi provide a
distinct signature of the underlying charm quark spectra, and that signature is
essentially independent of the detailed dynamics of the in-medium formation
reaction. In addition, both of these signatures are sufficiently separated from
the case in which no in-medium formation takes place. Finally, utilizing a
model for the fraction of J/Psi which originate from in-medium formation, we
predict the centrality behavior of these signatures.


title: Radiative Effects in the Standard Model Extension

abstract:
  The possibility of radiative effects induced by the Lorentz and CPT
non-invariant interaction term for fermions in the Standard Model Extension is
investigated. In particular, electron-positron photo-production and photon
emission by electrons and positrons are studied. The rates of these processes
are calculated in the Furry picture. It is demonstrated that the rates obtained
in the framework of the model adopted strongly depend on the polarization
states of the particles involved. As a result, ultra-relativistic particles
produced should occupy states with a preferred spin orientation, i.e., photons
have the sign of polarization opposite to the sign of the effective potential,
while charged particle are preferably in the state with the helicity coinciding
with the sign of the effective potential. This leads to evident spatial
asymmetries which may have certain consequences observable at high energy
accelerators, and in astrophysical and cosmological studies.


title: Generalized dual symmetry of nonabelian theories, monopoles and dyons

abstract:
  In the present talk we present an investigation of nonabelian SU(N) gauge
theories, describing a system of fields with non--dual g and dual \tilde g
charges and revealing the generalized dual symmetry. The Zwanziger type action
is suggested. The renormalization group equations for pure nonabelian theories,
in particular for pure SU(3)\times\widetilde{SU(3)} gauge theory (as an
example) are analysed. We consider not only monopoles, but also dyons. The
behaviour of the QCD total beta--function is investigated. It was shown that
this beta--function is antisymmetric under the interchange
\alpha\leftrightarrow\frac 1\alpha (here \alpha\equiv\alpha_s), and has zero
("fixed point") at \alpha = 1. Monopoles, or dyons, are responsible for the
phase transition. Considering critical points at \alpha_1\approx 0.4 and
\alpha_2\approx 2.5, we give an explanation of the freezing of \alpha_s.


title: A Supersymmetric 3-3-1 model with MSSM-like Scalar Sector

abstract:
  We present a supersymmetric 3-3-1 model with exotic quarks and a charged
lepton as an extension of the MSSM model with anomaly free three generations
The scalar sector is studied with six triplet Higgses and the mass spectrum for
light Higgs scalars are found to obey MSSM like predictions .The trilinear
Higgs term in 3-3-1 is found to be consistent with the bilinear mHuHd term of
MSSM and play an important role in the tree-level mass spectrum of scalars.


title:
$H_{TC}\Pi^0$ and $\Pi^+\Pi^-$ pair productions at the planned $e^ + e^
  -$ colliders in the topcolor-assisted technicolor model

abstract:
  The top-pions($\Pi^{0,\pm}$) and the top-Higgs($H_{TC}$) are the typical
particles predicted by the topcolor-assisted technicolor (TC2) model and the
observation of these particles can be regarded as the direct evidence of the
TC2 model. In this paper, we study two pair production processes of these new
particles, i.e., $e^ + e^ - \to H_{TC}\Pi^0$ and $e^+e^-\to \Pi^+\Pi^-$. The
results show that the production rates are at the level of serval fb for $e^ +
e^ - \to H_{TC}\Pi^0$ and tens fb for $e^+e^-\to \Pi^+\Pi^-$. These processes
can produce the adequate distinct multi-jet final states and the SM background
can be efficiently reduced. So, with the high luminosity at the planned linear
colliders, the top-pions and top-Higgs can be observable via these two pair
production processes without double.


title:
Study of the single neutral top-pion production process at
  $\gamma\gamma$ collider

abstract:
  $\gamma\gamma\to \Pi_t^0$ is the major production mechanism of neutral
top-pion at the linear colliders. In this paper, we calculate the cross section
of the process $\gamma\gamma \to \Pi^0_t$ and discuss the potential to observe
the neutral top-pion via its various decay modes at the planned ILC. The study
show that, among the various neutral top-pion production processes at the
linear colliders, the cross section of $\gamma\gamma\to \Pi_t^0$ is the largest
one which can reach the level of $10^1-10^2$ fb. Due to the existence of the
tree-level flavor-changing coupling $\Pi_t^0 t\bar{c}$, $\gamma\gamma\to
\Pi_t^0 \to t\bar{c}$ can provide enough number of typical signals to identify
the neutral top-pion with the clean SM background. Therefore, the process
$\gamma\gamma\to \Pi_t^0$ play an important role in searching for the neutral
top-pion and test the TC2 model.


title: Chiral filtering of spin states as a source of SSA

abstract:
  We discuss simple nonperturbative mechanism for generation of single-spin
asymmetries in hadron processes and hyperon polarization in particular.


title: Electroproduction of two light vector mesons in next-to-leading BFKL

abstract:
  We calculate the amplitude for the forward electroproduction of two light
vector mesons in next-to-leading order BFKL. This amplitude represents the
first next-to-leading order amplitude ever calculated for a collision process
between strongly interacting colorless particles.


title: Special relativity in decays of hybrids

abstract:
  A decay of a heavy hybrid is expected to produce light mesons flying out with
speeds comparable to the speed of light and phenomenological models of the
decay must respect symmetries of special relativity. We study consequences of
this requirement in a class of simple constituent models with spin. Our models
respect boost symmetry because they conform to the rules of a boost-invariant
renormalization group procedure for effective particles in light-front QCD. But
rotational symmetry of the decay amplitude is not guaranteed and the parameters
in the model wave functions must take special values in order to obtain the
symmetry. When the effective interaction Hamiltonian responsible for a hybrid
decay has the same structure as the gluon-quark-antiquark interaction term
obtained by solving the renormalization group equations for Hamiltonians in
first order perturbation theory, the non-relativistic image of a hybrid as
built from a quark and an antiquark and a heavy gluon that typically resides
between the quarks, cannot produce rotationally symmetric amplitude. However,
there exists an alternative generic picture in the model that does satisfy the
requirements of special relativity. Namely, the distance between the quark and
antiquark must be much smaller than the distance between the gluon and the pair
of quarks, as if a hybrid were similar to a gluonium in which one gluon is
replaced by a quark-antiquark pair.


title:
Branon radiative corrections to collider physics and precision
  observables

abstract:
  In the context of brane-world scenarios, we study the effects produced by the
exchange of virtual massive branons. A one-loop calculation is performed which
generates higher-dimensional operators involving SM fields suppressed by powers
of the brane tension scale. We discuss constraints on this scenario from
colliders such as HERA, LEP and Tevatron and prospects for future detections at
LHC or ILC. The most interesting phenomenology comes from new four-particles
vertices induced by branon radiative corrections, mainly from four fermion
interactions. The presence of flexible branes modifies also the muon anomalous
magnetic moment and the electroweak precision observables.


title: Glueball decay in the Fock-Tani formalism

abstract:
  We investigate the two-meson decay modes for $f_0(1500)$. In this calculation
we consider this resonance as a glueball. The Fock-Tani formalism is introduced
to calculate the decay width.


title: Pentaquarks in the Jaffe-Wilczek approximation

abstract:
  The masses of $uudd\bar s $, $uudd\bar d$ and $uuss\bar d$ pentaquarks are
evaluated in a framework of both the Effective Hamiltonian approach to QCD and
spinless Salpeter using the Jaffe--Wilczek diquark approximation and the string
interaction for the diquark--diquark--antiquark system. The pentaquark masses
are found to be in the region above 2 GeV. That indicates that the Goldstone
boson exchange effects may play an important role in the light pentaquarks. The
same calculations yield the mass of $[ud]^2\bar c$ pentaquark $\sim$ 3250 MeV
and $[ud]^2\bar b$ pentaquark $\sim$ 6509 MeV.


title:
Transverse energy and charged particle multiplicity at various
  centralities at RHIC: Statistical model estimates

abstract:
  The transverse energy and the charged particle multiplicity at midrapidity
are evaluated in a single-freeze-out model for different centrality bins at
RHIC at $\sqrt{s_{NN}}=130$ and 200 GeV. The predictions of the model are done
at the freeze-out parameters determined earlier from measured particle yields
and $p_{T}$ spectra. The results agree qualitatively well with the experimental
data.


title:
Possible saturation effects at HERA and LHC in the $k_T$-factorization
  approach

abstract:
  We consider possible saturation effects in the structure function $F_L$ at
fixed W in HERA energy range and in $b\bar b-$production at LHC energies in the
framework of $k_T-$facrorization approach.


title:
The See-Saw Mechanism, Neutrino Yukawa Couplings, LFV Decays l_i to l_j
  + gamma and Leptogenesis

abstract:
  The LFV charged lepton decays mu to e + gamma, tau to e + gamma and tau to mu
+ gamma and thermal leptogenesis are analysed in the MSSM with see-saw
mechanism of neutrino mass generation and soft SUSY breaking with universal
boundary conditions. The case of hierarchical heavy Majorana neutrino mass
spectrum, M_1 << M_2 << M_3, is investigated. Leptogenesis requires M_1 > 10^9
GeV. Considering the natural range of values of the heaviest right-handed
Majorana neutrino mass, M_3 > 5*10^{13} GeV, and assuming that the soft SUSY
breaking universal gaugino and/or scalar masses have values in the range of few
100 GeV, we derive the combined constraints, which the existing stringent upper
limit on the mu to e + gamma decay rate and the requirement of successful
thermal leptogenesis impose on the neutrino Yukawa couplings, heavy Majorana
neutrino masses and SUSY parameters. Results for the three possible types of
light neutrino mass spectrum -- normal and inverted hierarchical and
quasi-degenerate -- are obtained.


title: Testing Supersymmetry with Lepton Flavor Violating tau and mu decays

abstract:
  In this work the following lepton flavor violating $\tau$ and $\mu$ decays
are studied: $\tau^- \to \mu^- \mu^- \mu^+$, $\tau^- \to e^- e^- e^+$, $\mu^-
\to e^- e^- e^+$, $\tau^- \to \mu^- \gamma$, $\tau^- \to e^- \gamma$ and $\mu^-
\to e^- \gamma$. We work in a supersymmetric scenario consisting of the minimal
supersymmetric standard model particle content, extended by the addition of
three heavy right handed Majorana neutrinos and their supersymmetric partners,
and where the generation of neutrino masses is done via the seesaw mechanism.
Within this context, a significant lepton flavor mixing is generated in the
slepton sector due to the Yukawa neutrino couplings, which is transmited from
the high to the low energies via the renormalization group equations. This
slepton mixing then generates via loops of supersymmetric particles significant
contributions to the rates of $l_j \to 3 l_i$ and the correlated $l_j \to l_i
\gamma$ decays. We analize here in full detail these rates in terms of the
relevant input parameters, which are the usual minimal supergravity parameters
and the seesaw parameters. For the $l_j \to 3 l_i$ decays, a full one-loop
analytical computation of all the contributing supersymmetric loops is
presented. This completes and corrects previous computations in the literature.
In the numerical analysis compatibility with the most recent experimental upper
bounds on all these $\tau$ and $\mu$ decays, with the neutrino data, and with
the present lower bounds on the supersymmetric particle masses are required.
Two typical scenarios with degenerate and hierarchical heavy neutrinos are
considered. We will show here that the minimal supergravity and seesaw
parameters do get important restrictions from these $\tau$ and $\mu$ decays in
the hierarchical neutrino case.


title: Minimal Deflected Anomaly Mediation

abstract:
  I provide a minimal method for generating a mu term and positive slepton
masses within the framework of anomaly mediation. I introduce a new operator
involving a hidden sector U(1) gauge field which is then canceled against a
Giudice-Masiero-like mu term. No new flavor violating operators are allowed.
This procedure produces viable electroweak symmetry breaking in the Higgs
sector. Only a single pair of new vector-like messenger fields is needed to
correct the slepton masses by deflecting them from their anomaly mediated
trajectories. This model is minimal but it requires fine-tuning.


title: Kinetic and Chemical Equilibration in Scalar phi^4 Theory

abstract:
  Approximations based on the 2PI effective action are used to investigate the
process of equilibration in phi^4 theory in 3+1 dimensions, both in the
symmetric and broken phase. A special emphasis is put on the study of the
kinetic and chemical equilibration.


title: GPD's and Ssa's

abstract:
  Generalized parton distributions involving transverse polarization are
transversely deformed. The deformation of chirally odd GPDs is related to a
transversity decomposition of the quark angular momentum. Potential
consequences for T-odd single-spin asymmetries (Sivers and Boer-Mulders
effects) are discussed.


title:
Scalar mesons and low-mass sigma: Does the $\sigma$ reveal the
  confinement singularity?

abstract:
  I present a short review of the current understanding of the scalar meson
sector, with special attention to the problem of the low-mass $\sigma$. The
dispersion relation $N/D$-method used for the restoration of the low-energy
$\pi\pi$ $(IJ^{PC}=00^{++})$-wave amplitude is discussed. The low-energy
$\pi\pi$ amplitude was determined from the data in the energy region 280--500
MeV and it was sewn with the previously found $K$-matrix solution for the
region 450--1950 MeV. The $N/D$-amplitude has a pole on the second sheet of the
complex-$s$ plane, near the $\pi\pi$ threshold at $\sqrt s \simeq 430-i325$
MeV, that corresponds to the low-mass $\sigma$-meson. I discuss the hypothesis
that this pole may be related to the confinement forces, thus being the
eyewitness of confinement.


title:
Quark--antiquark states and their radiative transitions in terms of the
  spectral integral equation. {\Huge I.} Bottomonia

abstract:
  In the framework of the spectral integral equation, we consider the $b\bar b$
states and their radiative transitions. We reconstruct the $b\bar b$
interaction on the basis of data for the levels of the bottomonium states with
$J^{PC}=0^{-+}$, $1^{--}$, $0^{++}$, $1^{++}$, $2^{++}$ as well as the data for
the radiative transitions $\Upsilon(3S) \to\gamma\chi_{bJ}(2P) $ and
$\Upsilon(2S) \to\gamma \chi_{bJ}(1P) $ with $J=0,1,2$. We calculate
bottomonium levels with the radial quantum numbers $n\le 6$, their wave
functions and corresponding radiative transitions. The ratios
$Br[\chi_{bJ}(2P)\to\gamma\Upsilon(2S)]/Br[\chi_{bJ}(2P)\to\gamma\Upsilon(1S)]$
for $J=0,1,2$ are found in the agreement with data. We determine the $b\bar b$
component of the photon wave function using the data for the $e^+e^-$
annihilation, $e^+e^- \to\Upsilon(9460)$, $\Upsilon(10023)$, $\Upsilon(10036)$,
$\Upsilon(10580)$, $ \Upsilon(10865)$, $\Upsilon(11019)$, and predict partial
widths of the two-photon decays $\eta_{b0}\to\ggam$, $\chi_{b0}\to\ggam$,
$\chi_{b2}\to\ggam$ for the radial excitation states below $B\bar B$ threshold
($n\le 3$).


title: Neutrino Properties in Supersymmetric Models with R-parity Breaking

abstract:
  We review supersymmetric models where R-parity is broken either explicitly or
spontaneously. The simplest unified extension of the MSSM with explicit
bilinear R--Parity violation provides a predictive scheme for neutrino masses
and mixings which can account for the observed atmospheric and solar neutrino
anomalies. Despite the smallness of neutrino masses R-parity violation is
observable at present and future high-energy colliders, providing an
unambiguous cross-check of the model. This model can be shown to be an
effective model for the, more theoretically satisfying, spontaneous broken
theory. The main difference in this last case is the appearance of a massless
particle, the majoron, that can modify the decay modes of the Higgs boson,
making it decay invisibly most of the time.


title: Leptogenesis, Yukawa Textures and Weak Basis Invariants

abstract:
  We show that a large class of sets of leptonic texture zeros considered in
the literature imply the vanishing of certain CP-odd weak-basis invariants.
These invariant conditions enable one to recognize a flavour model
corresponding to a set of texture zeros, when written in an arbitrary
weak-basis where the zeros are not manifest. We also analyse the r\^ ole of
texture zeros in allowing for a connection between leptogenesis and low-energy
leptonic masses, mixing and CP violation. For some of the textures the
variables relevant for leptogenesis can be fully determined in terms of low
energy parameters and heavy neutrino masses.


title: CP violation in meson decays

abstract:
  This is a written version of a series of lectures aimed at graduate students
in the field of (theoretical and experimental) high energy physics. The main
topics covered are: (i) The flavor sector of the Standard Model and the
Kobayashi-Maskawa mechanism of CP violation; (ii) Formalism and theoretical
interpretation of CP violation in meson decays; (iii) K decays; (iv) D decays;
(v) B decays: b -> c c-bar s, b -> s s-bar s, b -> u u-bar d and b -> c u-bar
s, u c-bar s; (vi) CP violation as a probe of new physics and, in particular,
of supersymmetry.


title: Sophisticated momenta mapping with DIANA

abstract:
  Details of recent developments of the Feynman diagram analyzer DIANA (DIagram
ANAlyser) are presented. Apart from some discussion about QGRAF and new
plotting features, we concentrate on a new sophisticated mechanism of momenta
mapping.


title: $ ^7 Be$ Neutrino Signal Variation in KamLAND

abstract:
  Large Mixing Angle (LMA) neutrino oscillation is the main solution for the
long-standing Solar Neutrino Problem (SNP). Whether there is any subdominant
effect accompanying the dominant LMA solution can not be ruled out at the
moment, but will be settled by the forthcoming data from highly skilled real
time experiments targeting essentially the low energy domain of solar
neutrinos. Assuming a subdominant effect converting one of the active neutrinos
into a sterile partner in the varying solar field with changing sunspot
activity, we performed field-profile-independent predictions for $^7 Be$
neutrino signal variation, which might be tested in the KamLAND's future solar
neutrino detection program. We found that after a substantial reduction of
background and running of KamLAND solar mode through the sunspot maximum period
(around 2010 - 2012), when the solar field at the resonance may vary from few
$kG$ to $300~kG$, the subdominant time variation effect might be clearly
visible (more than $5\sigma$) for $^7 Be$ neutrinos.


title: Multi-Particle Processes in the Standard Model without Feynman Diagrams

abstract:
  A method to efficiently compute, in a automatic way, helicity amplitudes for
arbitrary scattering processes at leading order in the Standard Model is
presented. The scattering amplitude is evaluated recursively through a set of
Dyson-Schwinger equations. The computational cost of this algorithm grows
asymptotically as 3^n, where n is the number of particles involved in the
process, compared to n! in the traditional Feynman graphs approach. Unitary
gauge is used and mass effects are available as well. Additionally, the color
and helicity structures are appropriately transformed so the usual summation is
replaced by Monte Carlo techniques. Some results related to the production of
vector bosons and the Higgs boson in association with jets are also presented.


title: Boltzmann Collision Term

abstract:
  We derive the Boltzmann equation for scalar fields using the
Schwinger-Keldysh formalism. The focus lies on the derivation of the collision
term. We show that the relevant self-energy diagrams have a factorization
property. The collision term assumes the Boltzmann-like form of scattering
probability times statistical factors for those self-energy diagrams which
correspond to tree level scattering processes. Our proof covers scattering
processes with any number of external particles, which come from self-energy
diagrams with any number of loops.


title: The Phenomenology of Universal Extra Dimensions at Hadron Colliders

abstract:
  Theories with extra dimensions of inverse TeV size (or larger) predict a
multitude of signals which can be searched for at present and future colliders.
In this paper, we review the different phenomenological signatures of a
particular class of models, universal extra dimensions, where all matter fields
propagate in the bulk. Such models have interesting features, in particular
Kaluza-Klein (KK) number conservation, which makes their phenomenology similar
to that of supersymmetric theories. Thus, KK excitations of matter are produced
in pairs, and decay to a lightest KK particle (LKP), which is stable and weakly
interacting, and therefore will appear as missing energy in the detector
(similar to a neutralino LSP). Adding gravitational interactions which can
break KK number conservation greatly expands the class of possible signatures.
Thus, if gravity is the primary cause for the decay of KK excitations of
matter, the experimental signals at hadron colliders will be jets + missing
energy, which is typical of supergravity models. If the KK quarks and gluons
decay first to the LKP, which then decays gravitationally, the experimental
signal will be photons and/or leptons (with some jets), which resembles the
phenomenology of gauge mediated supersymmetry breaking models.


title: Theory and Phenomenology of an Exceptional Supersymmetric Standard Model

abstract:
  We make a comprehensive study of the theory and phenomenology of a low energy
supersymmetric standard model originating from a string-inspired $E_6$ grand
unified gauge group. The Exceptional Supersymmetric Standard Model (ESSM)
considered here is based on the low energy SM gauge group together with an
extra $Z'$ corresponding to an extra $U(1)_{N}$ gauge symmetry under which
right--handed neutrinos have zero charge. The low energy matter content of the
ESSM corresponds to three 27 representations of the $E_6$ symmetry group, to
ensure anomaly cancellation, plus an additional pair of Higgs--like doublets as
required for high energy gauge coupling unification. The ESSM is therefore a
low energy alternative to the MSSM or NMSSM. The ESSM involves extra matter
beyond the MSSM contained in three $5+5^*$ representations of SU(5), plus three
SU(5) singlets which carry $U(1)_{N}$ charges, one of which develops a VEV,
providing the effective $\mu$ term for the Higgs doublets, as well as the
necessary exotic fermion masses. We explore the RG flow of the ESSM and examine
theoretical restrictions on the values of new Yukawa couplings caused by the
validity of perturbation theory up to the Grand Unification scale. We then
discuss electroweak symmetry breaking and Higgs phenomenology, and establish an
upper limit on the mass of the lightest Higgs particle which can be
significantly heavier than in the MSSM and NMSSM, in leading two--loop
approximation. We also discuss the phenomenology of the $Z'$ and the extra
matter, whose discovery will provide a smoking gun signal of the model.


title: TeV-Scale Black Holes in Warped Higher-Curvature Gravity

abstract:
  We examine the properties of TeV-scale extra dimensional black holes (BH) in
Randall-Sundrum-like models with Gauss-Bonnet higher-curvature terms present in
the action. These theories naturally lead to a mass threshold for BH production
in TeV particle collisions which could be observable at LHC/ILC. The lifetimes
of such BH are examined and, in particular, we focus on the predicted lifetime
differences between the canonical and microcanonical thermodynamical
descriptions of BH decaying to Standard Model brane fields and the possibility
of long-lived relics. The sensitivity of these results to the particular mix of
fermions and bosons present in the Standard Model spectrum is also briefly
examined.


title: Z and Z' decays with and without FCNC in 331 models

abstract:
  In the context of the 331 models, we consider constraints on the extra
neutral boson $Z^{\prime}$ predicted by the model, where three different quark
family assignments are identified. Using the ansatz of Matsuda as an specific
texture for the quark mass matrices, we obtain allowed regions associated with
the Z-Z' mixing angle, the mass of the $Z^{\prime}$ boson and the parameter
$\beta$ which determines different 331 models. The $Z_{1}$ and $Z_{2}$ decays
with and without flavor changing are also considered. The flavor changing
decays of the $Z_{1}$ boson into quarks at tree level are highly suppressed by
the $Z-Z^{\prime}$ mixing angle, obtaining the same order of magnitude as the
standard model prediction at one loop level. The $% Z_{2}$ decay widths are
calculated with and without flavor changing, where oblique radiative
corrections at one loop accounts for about $1%-4%$ deviations.


title:
Current and Future Limits on General Flavour Violation in b-->s
  Transitions in Minimal Supersymmetry

abstract:
  We discuss the current and prospective limits that can be placed on
supersymmetric contributions to $b\to s$ transitions in the Minimal
Supersymmetric Standard Model with general flavour mixing amongst the squarks.
We consider three processes: $\bar{B}\to X_s\gamma$, $\bar{B}_s\mu^+\mu^-$ and
$\bar{B}_s-B_s$ mixing, and pay particular attention to the large $\tan\beta$
regime and beyond leading order contributions where the difference between our
analysis and previous analyses is most pronounced. We find that even present
limits on BR$(\bar{B}_s\mu^+\mu^-)$ and $\Delta m_{B_s}$ often provide
additional constraints on the amount of flavour violation still allowed by
BR$(\bar{B}\to X_s\gamma)$. Limits on supersymmetric and Higgs mass parameters
can also be strongly dependent on the flavour violation. In particular, the
case $\mu<0$ can still be allowed, even for light sparticle masses. We discuss
how future measurements at the Tevatron, the LHC and elsewhere can improve
present limits but also provide unique signatures for the existence of flavour
violation.


title: Classical running of neutrino masses from six dimensions

abstract:
  We discuss a six dimensional mass generation for the neutrinos. Active
neutrinos live on a three-brane and interact via a brane localized mass term
with a bulk six-dimensional standard model singlet (sterile) Weyl fermion, the
two dimensions being transverse to the three-brane.
  We derive the physical neutrino mass spectrum and show that the active
neutrino mass and Kaluza-Klein masses have a logarithmic cutoff divergence
related to the zero-size limit of the three-brane in the transverse space. This
translates into a renormalisation group running of the neutrino masses above
the Kaluza-Klein compactification scale coming from classical effects, without
any new non-singlet particles in the spectrum. For compact radii in the eV--MeV
range, relevant for neutrino physics, this scenario predicts running neutrino
masses which could affect, in particular, neutrinoless double beta decay
experiments.


title: A New Mechanism for Light Composite Higgs Bosons

abstract:
  Repeated symmetry-breaking and restoration phase transitions occur as one
traverses the parameter space of interactions competing to align the vacuum.
This phenomenon, augmented with a topcolor-like interaction, can make a
composite Higgs boson's mass and vacuum expectation value naturally much less
than its underlying structure scale, without introducing new symmetries and
their associated TeV-scale particles. We illustrate it by reconstructing a
simple light composite Higgs model of electroweak symmetry breaking proposed by
Georgi and Kaplan.


title: E-Wimps

abstract:
  Extremely weakly interacting massive particles (E-WIMPs) are intriguing
candidates for cold dark matter in the Universe. We review two well motivated
E-WIMPs, an axino and a gravitino, and point out their cosmological and
phenomenological similarities and differences, the latter of which may allow
one to distinguishing them in LHC searches for supersymmetry.


title: Enhancement of the hadronic b quark decays

abstract:
  A class of previously unknown strong-interaction corrections is found to
enhance the rate of non-leptonic decays of the b quark by 5-8 percent. This
effect decreases the predicted fraction of semi-leptonic decays and brings it
into fair agreement with experimental results. As well as solving a
long-standing puzzle of measurements disagreeing with the Standard Model
prediction, our work suggests a way for future precise studies of non-leptonic
$b$ quark decays and their application to searching for "new physics."


title:
Quark--antiquark states and their radiative transitions in terms of the
  spectral integral equation. {\Huge II.} Charmonia

abstract:
  In the precedent paper of the authors (hep-ph/0510410), the $b\bar b$ states
were treated in the framework of the spectral integral equation, together with
simultaneous calculations of radiative decays of the considered bottomonia. In
the present paper, such a study is carried out for the charmonium $(c\bar c)$
states. We reconstruct the interaction in the $c\bar c$-sector on the basis of
data for the charmonium levels with $J^{PC}=0^{-+}$, $1^{--}$, $0^{++}$,
$1^{++}$, $2^{++}$, $1^{+-}$ and radiative transitions
$\psi(2S)\to\gamma\chi_{c0}(1P)$, $\gamma\chi_{c1}(1P)$, $\gamma\chi_{c2}(1P)$,
$\gamma\eta_{c}(1S)$ and $\chi_{c0}(1P)$, $\chi_{c1}(1P)$,
$\chi_{c2}(1P)\to\gamma J/\psi$. The $c\bar c$ levels and their wave functions
are calculated for the radial excitations with $n\le 6$. Also, we determine the
$c\bar c$ component of the photon wave function using the $e^+e^-$ annihilation
data: $e^+e^- \to J/\psi(3097)$, $\psi(3686)$, $\psi(3770)$, $\psi(4040)$, $
\psi(4160)$, $\psi(4415)$ and perform the calculations of the partial widths of
the two-photon decays for the $n=1$ states: $\eta_{c0}(1S)$, $\chi_{c0}(1P)$,
$\chi_{c2}(1P)\to\gamma\gamma$, and $n=2$ states:
$\eta_{c0}(2S)\to\gamma\gamma$, $\chi_{c0}(2P)$, $\chi_{c2}(2P)\to
\gamma\gamma$. We discuss the status of the recently observed $c\bar c$ states
X(3872) and Y(3941): according to our results, the X(3872) can be either
$\chi_{c1}(2P)$ or $\eta_{c2}(1D)$, while Y(3941) is $\chi_{c2}(2P)$.


title:
Determination of MSSM Parameters from LHC and ILC Observables in a
  Global Fit

abstract:
  We present the results of a realistic global fit of the Lagrangian parameters
of the Minimal Supersymmetric Standard Model assuming universality for the
first and second generation and real parameters. No assumptions on the SUSY
breaking mechanism are made. The fit is performed using the precision of future
mass measurements of superpartners at the LHC and mass and polarized
topological cross-section measurements at the ILC. Higher order radiative
corrections are accounted for whereever possible to date. Results are obtained
for a modified SPS1a MSSM benchmark scenario but they were checked not to
depend critically on this assumption. Exploiting a simulated annealing
algorithm, a stable result is obtained without any a priori assumptions on the
values of the fit parameters. Most of the Lagrangian parameters can be
extracted at the percent level or better if theoretical uncertainties are
neglected. Neither LHC nor ILC measurements alone will be sufficient to obtain
a stable result. The effects of theoretical uncertainties arising from unknown
higher-order corrections and parametric uncertainties are examined
qualitatively. They appear to be relevant and the result motivates further
precision calculations. The obtained parameters at the electroweak scale are
used for a fit of the parameters at high energy scales within the bottom-up
approach. In this way regularities at these scales are explored and the
underlying model can be determined with hardly any theoretical bias. Fits of
high-scale parameters to combined LHC+ILC measurements within the mSUGRA
framework reveal that even tiny distortions in the low-energy mass spectrum
already lead to inacceptable chi^2 values. This does not hold for ``LHC only''
inputs.


title: Unitary Structure of the QCD Sum Rules and KYN and KY\Xi Couplings

abstract:
  New relations between QCD Borel sum rules for strong coupling constants of
K-mesons to baryons are derived. It is shown that starting from the sum rule
for the coupling constants $g_{\pi\Sigma\Sigma}$ and $g_{\pi\Sigma\Lambda}$ it
is straightforward to obtain corresponding sum rules for the $g_{K Y N}$, $g_{K
Y \Xi}$ couplings, $Y=\Sigma,\Lambda$.


title: Determining masses of supersymmetric particles

abstract:
  If supersymmetric particles are produced at the Large Hadron Collider it
becomes very important not only to identify them, but also to determine their
masses with the highest possible precision, since this may lead to an
understanding of the SUSY-breaking mechanism and the physics at some higher
scale. We here report on studies of how such mass measurements are obtained,
and how the precision can be optimized.


title: The 2PI coupling expansion revisited

abstract:
  Recently, out-of-equilibrium field theory has been studied using
approximations based on truncations of the 2PI effective action. Although
results are promising, the convergence of subsequent orders of the
approximation is difficult to get a handle on, mainly because, generically,
only the lowest non-trivial order is currently numerically tractable. We study
one specific case, the broken phase of the phi^4 model, where the existence of
an effective three point vertex makes it possible to compare a lowest and
next-to-lowest non-trivial order.


title: The Effective Matter Potential for Highly Relativistic Neutrinos

abstract:
  We investigate matter effects on highly relativistic neutrinos. The
self-energy of neutrinos is determined in an electron or neutrino background
taking into account resonance and finite width effects of the gauge bosons. We
find minor changes compared to the formerly used formula for the propagator
function and large deviations of the effective width from the decay width of
the gauge bosons considering higher moments of the electron or neutrino
distribution function.


title: Supersymmetric Grand Unification: the quest for the theory

abstract:
  With the advent of neutrino masses, it has become more and more acknowledged
that SO(10) is a more suitable theory than SU(5): it leads naturally to small
neutrino masses via the see-saw mechanism, it has a simpler and more predictive
Yukawa sector. There is however a rather strong disagreement on what the
minimal consistent SO(10) theory is, i.e. what the Higgs sector is. The issue
is particularly sensitive in the context of low-energy supersymmetry.