title: Higgs Triplets and Limits from Precision Measurements

abstract:
  In this letter, we present our results on a global fit to precision
electroweak data in a Higgs triplet model. In models with a triplet Higgs
boson, a consistent renormalization scheme differs from that of the Standard
Model and the global fit shows that a light Higgs boson with mass of 100-200
GeV is preferred. Triplet Higgs bosons arise in many extensions of the Standard
Model, including the left-right model and the Little Higgs models. Our result
demonstrates the importance of the scalar loops when there is a large mass
splitting between the heavy scalars. It also indicates the significance of the
global fit.


title:
Quark-Gluon String Model Description of Baryon Production in K^{\pm}N
  Interactions

abstract:
  The process of baryon production in K p collisions at high energies is
considered in the framework of the Quark-Gluon String Model. The contribution
of the string-junction mechanism to the strange baryon production is analysed.
The results of numerical calculations are in reasonable agreement with the data
on inclusive spectra of p, Lambda, bar{Lambda}, and on the bar{Lambda}/Lambda
asymmetry. The predictions for Xi and Omega baryons are presented.


title: On Electroweak Matching Conditions for Top Pair Production at Threshold

abstract:
  We determine the real parts of electroweak matching conditions relevant for
top quark pair production close to threshold in e+e- annihilation at
next-to-next-to-leading logarithmic (NNLL) order. Numerically the corrections
are comparable to the NNLL QCD corrections.


title: Thermodynamics of QCD-inspired theories

abstract:
  In this thesis I investigate the thermodynamics of the O(N) nonlinear sigma
model and the CP^(N-1) model in 1 + 1 dimensions, which are toy models for QCD.
In particular I put emphasis on the calculation of the effective potential and
the pressure to next-to-leading order in 1/N. One interesting result is that
the effective potential contains temperature-dependent ultraviolet divergences
that vanish in the minimum. Furthermore I discuss two low-energy effective
theories, the O(N) linear sigma model in 3 + 1 dimensions and the NJL model. In
the O(N) model I calculate the effective potential and the pressure up to
next-to-leading order in 1/N. I also discuss a rather low bound on the mass of
the sigma meson in that model. The NJL model is used to calculate phase
diagrams with pseudoscalar condensation and color superconductivity as a
function of different quark chemical potentials. I find that phases with
pseudoscalar condensation are separated from the color superconducting phases
by a first order transtion.


title: Quark masses and mixings in E6 x S3 : a montecarlo approach

abstract:
  Recently in arXiv:hep-ph/0510321 has been proposed a GUT model for fermion
masses and mixings with spontaneously broken S3 discrete flavor symmetry, where
S_3 is the permutation group of three objects. The S3 breaking pattern in the
quark sector is not studied and need further investigation. Since in such a
model the number of free parameters is greater than the number of experimental
observables, an analytical fit of all the parameters is impossible. To go
forward with the model building and to deal with this problem we have used a
statistical analysis. We have found that S3 is totally broken and the up-type
quarks matrix is approximatively diagonal while down-type quarks matrixis not
symmetric and it is parametrized by three couplings, gd, gLd and g3d. It has
been found that gLd is slightly smaller than gd=1 and it is of order one, while
g3d \sim l^3 where l is the Cabibbo angle. An analytical study of the
dependence of Vcb and Vub from the couplings gLd and g3d is also presented.


title: Dark Matter and the ILC

abstract:
  We discuss the solution to the Dark Matter problem provided by the lightest
neutralino of the Minimal Supersymmetric Standard Model (MSSM) and highlight
the role of the International Linear Collider (ILC) in determining its
cosmological relic density.


title: Nuclear shadowing

abstract:
  The phenomenon of shadowing of nuclear structure functions at small values of
Bjorken-$x$ is analyzed. First, multiple scattering is discussed as the
underlying physical mechanism. In this context three different but related
approaches are presented: Glauber-like rescatterings, Gribov inelastic
shadowing and ideas based on high-density Quantum Chromodynamics. Next,
different parametrizations of nuclear partonic distributions based on fit
analysis to existing data combined with
Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution, are reviewed. Finally, a
comparison of the different approaches is shown, and a few phenomenological
consequences of nuclear shadowing in high-energy nuclear collisions are
presented.


title: Tests of the Higgs properties at the next colliders

abstract:
  We discuss the tests of the fundamental properties of the Standard Model
Higgs boson that can be performed in the next round of experiments.


title: Spontaneous CP Violation in a SUSY Model with a complex CKM

abstract:
  It is pointed out that the recent measurement of the angle $\gamma$ of the
unitarity triangle, providing irrefutable evidence for a complex
Cabibbo-Kobayashi-Maskawa (CKM) matrix, presents a great challenge for
supersymmetric models with spontaneous CP violation. We construct a new minimal
extension of the minimal supersymmetric standard model (MSSM), with spontaneous
CP breaking, which leads to a complex CKM matrix, thus conforming to present
experimental data. This is achieved through the introduction of two singlet
chiral superfields and a vector-like quark chiral superfield which mixes with
the standard quarks. A $Z_3$ symmetry is introduced in order to have a
potential solution to the strong CP problem.


title: The Minimal Set of Electroweak Precision Parameters

abstract:
  We present a simple method for analyzing the impact of precision electroweak
data above and below the Z-peak on flavour-conserving heavy new physics. We
find that experiments have probed about ten combinations of new physics
effects, which to a good approximation can be condensed into the effective
oblique parameters Shat, That, Uhat, V, X, W, Y (we prove positivity
constraints W, Y >= 0) and three combinations of quark couplings (including a
distinct parameter for the bottom). We apply our method to generic extra Z'
vectors.


title: Implications of the measurement of the B^0_s-\bar B^0_s mass difference

abstract:
  We analyze the significant new model independent constraints on extensions of
the standard model (SM) that follow from the recent measurements of the
B^0_s-\bar B^0_s mass difference. The time-dependent CP asymmetry in B_s ->
\psi\phi, S_{\psi\phi}, will be measured with good precision in the first year
of LHC data taking, which will further constrain the parameter space of many
extensions of the SM, in particular, next-to-minimal flavor violation. The CP
asymmetry in semileptonic B_s decay, A_{SL}^s, is also important to constrain
these frameworks, and could give further clues to our understanding the flavor
sector in the LHC era. We point out a strong correlation between S_{\psi\phi}
and A_{SL}^s in a very broad class of new physics models.


title:
Constraints on neutrino mixing angle theta_13 and Supernova neutrino
  fluxes from the LSD neutrino signal from SN1987A

abstract:
  Detection of 5 events by the Liquid Scintillation Detector (LSD) on February,
23, 1987 was recently interpreted as a detection of the electron neutrino flux
from the first stage of the two-stage Supernova collapse. We show that, if
neutrino mass hierarchy is normal, such interpretation excludes values of
neutrino mixing angle \theta_{13} larger than 3\cdot 10^{-2}, independently of
the particular Supernova collapse model. Also constraints on the original
fluxes of neutrinos and antineutrinos of different flavours are obtained.


title:
Cold Dark Matter, Radiative Neutrino Mass, mu to e gamma, and
  Neutrinoless Double Beta Decay

abstract:
  Two of the most important and pressing questions in cosmology and particle
physics are: (1) What is the nature of cold dark matter? and (2) Will
near-future experiments on neutrinoless double beta decay be able to ascertain
that the neutrino is a Majorana particle, i.e. its own antiparticle? We show
that these two seemingly unrelated issues are intimately connected if neutrinos
acquire mass only because of their interactions with dark matter.


title: Probe Noncommutative Space-Time Scale Using $\gamma\gamma \to Z$ At ILC

abstract:
  In the standard model production of on-shell Z boson at a photon collider (or
Z decays into $\gamma\gamma$) is strictly forbidden by angular momentum
conservation and Bose statistics (the Yang's Theorem). In the standard model
with noncommutative space-time this process can occur. Therefore this process
provides an important probe for the noncommutative space-time. The
$\gamma\gamma$ collision at the ILC by laser backscattering of the electron and
positron beams offers an ideal place to carry out such a study. Assuming an
integrated luminosity of 500 fb$^{-1}$, we show that the constraint which can
be achieved on $\Gamma(Z\to \gamma \gamma)$ is three to four orders of
magnitude better than the current bound of $5.2\times 10^{-5}$ GeV. The
noncommutative scale can be probed up to a few TeVs.


title: Non-singlet QCD analysis of F_2(x,Q^2) up to NNLO

abstract:
  The significance of NNLO (3-loop) QCD contributions to the flavor non-singlet
sector of F_2^ep and F_2^ed has been studied as compared to uncertainties
(different factorization schemes, higher twist and QED contributions) of
standard NLO (and LO) QCD analyses. The latter effects turn out to be
comparable in size to the NNLO contributions. Therefore the minute NNLO effects
are not observable with presently available data on non-singlet structure
functions.


title:
Quenching of Leading Jets and Particles: the p_t Dependent
  Landau-Pomeranchuk-Migdal effect from Nonlinear k_t Factorization

abstract:
  We report the first derivation of the Landau-Pomeranchuk-Migdal effect for
leading jets at fixed values of the transverse momentum p_t in the beam
fragmentation region of hadron-nucleus collisions from RHIC (Relativistic Heavy
Ion Collider) to LHC (Large Hadron Collider). The major novelty of this work is
a derivation of the missing virtual radiative pQCD correction to these
processes - the real-emission radiative corrections are already available in
the literature. We manifestly implement the unitarity relation, which in the
simplest form requires that upon summing over the virtual and real-emission
corrections the total number of scattered quarks must exactly equal unity. For
the free-nucleon target, the leading jet spectrum is shown to satisfy the
familiar linear Balitsky-Fadin-Kuraev-Lipatov leading log(1/x) (LL-1/x)
evolution. For nuclear targets, the nonlinear k_t-factorization for the LL-1/x
evolution of the leading jet sepctrum is shown to exactly match the equally
nonlinear LL-1/x evolution of the collective nuclear glue - there emerges a
unique linear k_t-factorization relation between the two nonlinear evolving
nuclear observables. We argue that within the standard dilute uncorrelated
nucleonic gas treatment of heavy nuclei, in the finite energy range from RHIC
to LHC, the leading jet spectrum can be evolved in the LL-1/x
Balitsky-Kovchegov approximation. We comment on the extension of these results
to, and their possible reggeon field theory interpretation for, mid-rapidity
jets at LHC.


title:
Supersymmetric contributions to B -> D K and the determination of angle
  \gamma

abstract:
  We analyze supersymmetric contributions to B^- -> D^0 K^- and B^- ->\bar{D}^0
K^- processes. We investigate the possibility that supersymmetric CP violating
phases can affect our determination for the angle \gamma in the unitary
triangle of Cabibbo-Kobayashi-Maskaw mixing matrix. We calculate the gluino and
chargino contributions to b--> u(\bar{c}s) and b-->c(\bar{u}s) transitions in a
model independent way by using the mass insertion approximation method. We also
revise the D^0 - \bar{D}^0 mixing constraints on the mass insertions between
the first and second generations of the up sector. We emphasize that in case of
negligible D^0 -\bar{D}^0 mixing, one should consider simultaneous
contributions from more than one mass insertion in order to be able to obtain
the CP asymmetries of these processes within their 1\sigma experimental range.
However, with a large D^0-\bar{D}^0 mixing, one finds a significant deviation
between the two asymmetries and it becomes natural to have them of order the
central values of their experimental measurements.


title:
The Constraint on FCNC Coupling of the Top Quark with a Gluon from ep
  Collisions

abstract:
  Using the constraint on the single top production cross-section obtained at
the HERA collider, $\sigma(ep \to e t X)$, we evaluate an upper limit on
oupling constant of the anomalous top quark interaction with a gluon via
flavor-changing neutral current: $|\kappa_{tgq}/\Lambda| \le 0.4 {TeV}^{-1}$,
BR$(t \to gq) < 13 % $


title:
Les Houches Physics at TeV Colliders 2005, Standard Model and Higgs
  working group: Summary report

abstract:
  This Report summarises the activities of the "SM and Higgs" working group for
the Workshop "Physics at TeV Colliders", Les Houches, France, 2-20 May, 2005.
On the one hand, we performed a variety of experimental and theoretical studies
on standard candles (such as W, Z, and ttbar production), treating them either
as proper signals of known physics, or as backgrounds to unknown physics; we
also addressed issues relevant to those non-perturbative or semi-perturbative
ingredients, such as Parton Density Functions and Underlying Events, whose
understanding will be crucial for a proper simulation of the actual events
taking place in the detectors. On the other hand, several channels for the
production of the Higgs, or involving the Higgs, have been considered in some
detail. The report is structured into four main parts. The first one deals with
Standard Model physics, except the Higgs. A variety of arguments are treated
here, from full simulation of processes constituting a background to Higgs
production, to studies of uncertainties due to PDFs and to extrapolations of
models for underlying events, from small-$x$ issues to electroweak corrections
which may play a role in vector boson physics. The second part of the report
treats Higgs physics from the point of view of the signal. In the third part,
reviews are presented on the current status of multi-leg, next-to-leading order
and of next-to-next-to-leading order QCD computations. Finally, the fourth part
deals with the use of Monte Carlos for simulation of LHC physics.


title:
New Constraints on SUSY Flavour Mixing in Light of Recent Measurements
  at the Tevatron

abstract:
  We discuss the implications, for general flavour mixing, of the recent
results regarding the new allowed range for mixing in the $B_s$ meson system,
as well as the new improved bounds on $BR(\bar{B}_s\to\mu^+\mu^-)$. Constraints
on right handed insertions, in particular, improve considerably in the large
$\tanb$ regime where the contributions to $B_s$ mixing are dominated by double
Higgs penguins. Similarly, the allowed regions of parameter space when varying
multiple insertions also decrease significantly.


title: Masses of $[{\bf 70},\ell^+]$ Baryons in the $1/N_c$ Expansion

abstract:
  The masses of positive $[{\bf 70},0^+]$ and $[{\bf 70},2^+]$ nonstrange and
strange baryons are calculated in the $1/N_c$ expansion. The approach is based
on the separation of a system of $N_c$ quarks into an excited core and an
excited quark. The previous work for two flavor baryons is now extended to
include strange baryons, to first order in SU(3)-flavor breaking. We show that
the extension to $N_f = 3$ maintains the regularities previously observed in
the behaviour of the linear term in $N_c$, of the spin-spin and of the
spin-orbit terms. In particular the contribution of the spin-dependent terms
decrease with the excitation energy, the dominant term remaining the spin-spin
term.


title: Langevin dynamics of the deconfinement transition for pure gauge theory

abstract:
  We investigate the effects of dissipation in the deconfinement transition for
pure SU(2) and SU(3) gauge theories. Using an effective theory for the order
parameter, we study its Langevin evolution numerically. Noise effects are
included for the case of SU(2). We find that both dissipation and noise have
dramatic effects on the spinodal decomposition of the order parameter and delay
considerably its thermalization. For SU(3) the effects of dissipation are even
larger than for SU(2).


title: Inflation in the warm and cold regimes

abstract:
  It is now understood that inflation dynamics comes in two forms, isentropic
or cold inflation and nonisentropic or warm inflation. In the former, inflation
occurs without radiation production, whereas in the latter both radiation
production and inflation occur concurrently. Recent, detailed, quantum field
theory calculations have shown that many generic inflation models, including
hybrid inflation, which were believed only to have cold inflation regimes, in
fact have regimes of both warm and cold inflation. These results dispel many
foregone assumptions generally made up to now about inflation models and bring
to the fore various elementary issues that must be addressed to do reliable
calculations from inflation models. Here I review these results and issues. I
then show that warm inflation has intrinsic model independent features that
makes it natural or equivalently have no ``eta problem''. Next density
perturbations and observational consequences of warm inflation are discussed.
Finally the implications of warm inflation to model building and physics beyond
the Standard Model are outlined.


title: Tests of the naturalness of the coupling constants in ChPT at order p^6

abstract:
  We derive constraints on combinations of O(p^6) chiral coupling constants by
matching a recent two-loop calculation of the pi-K scattering amplitude with a
set of sum rules. We examine the validity of the natural expectation that the
values of the chiral couplings can be associated with physics properties of the
light resonance sector. We focus, in particular, on flavour symmetry breaking
of vector resonances. A resonance chiral Lagrangian is constructed which
incorporates flavour symmetry breaking more completely than was done before. We
use pi-K unsubtracted sum rules as tests of the modelling of the resonance
contributions to the chiral couplings. In some cases the O(p^6) couplings are
found not to be dominated by the resonance contributions.


title: Lepton Flavor Violation in Intersecting D-brane Models

abstract:
  We investigate lepton flavor violation in the context of intersecting D-brane
models. We point out that these models have a source to generate flavor
violation in the trilinear scalar couplings while the geometry of the
construction leads to degenerate soft scalar masses for different generations
(as in the minimal supergravity model) at the string scale. The trilinear
scalar couplings are not proportional to the Yukawa couplings when the F-term
of the U-moduli contribution is non-zero. Consequently, the lepton flavor
violating decay processes are generated. Only other sources of flavor
violations in this model are the Dirac neutrino Yukawa coupling and the
Majorana couplings. The observed fermion mixings are realized from the ``almost
rank 1" Yukawa matrices, which generate a simple texture for the trilinear
scalar terms. We calculate the branching ratios of tau -> mu gamma, mu -> e
gamma and the electric dipole moment of the electron in this model. We find
that the observation of all the lepton flavor violating decay processes and the
electric dipole moment will be able to sort out different flavor violating
sources.


title:
Electroweak radiative corrections to the Higgs-boson production in
  association with $Z^0$-boson pair at $e^+ e^-$ colliders

abstract:
  We present the full ${\cal O}(\alpha_{{ew}})$ electroweak radiative
corrections to the Higgs-boson production in association with $Z^0$-boson pair
at an electron-positron linear collider(LC) in the standard model. We analyze
the dependence of the full one-loop corrections on the Higgs-boson mass $m_{H}$
and colliding energy $\sqrt{s}$. We find that the corrections significantly
suppress the Born cross section, and the ${\cal O}(\alpha_{{ew}})$ electroweak
radiative corrections are generally between 1.0% and -15% in our chosen
parameter space, which should be taken into consideration in the future precise
experiments.


title:
Single-Transverse Spin Asymmetry in Semi-Inclusive Deep Inelastic
  Scattering

abstract:
  We study the single-transverse spin asymmetry in semi-inclusive hadron
production in deep inelastic scattering. We derive the leading contribution to
the asymmetry at moderate transverse momentum $P_{h\perp}$ of the produced
hadron in terms of twist-three quark-gluon correlation functions, and compare
with the approach based on the factorization at fixed transverse momentum
involving the asymmetric transverse-momentum and spin-dependent quark
distribution. We verify that the two approaches yield identical results in this
regime. By a comparison with our earlier calculations for the single-spin
asymmetry in the Drell-Yan process we recover the well-established
process-dependence of the time-reversal-odd transverse-momentum-dependent quark
distributions that generate single-spin phenomena.


title:
Determination of $\chi_b$ spin in the decays $\chi_{b0,2}\to\psi\psi$
  and $\chi_{b0,2}\to\JP\JP\to 2(\mu^+\mu^-)$

abstract:
  The decays $\chi_{b0,2}\to\psi\psi$ and
$\chi_{b0,2}\to\psi\psi\to2(\mu^+\mu^-)$ are considered. It is shown that with
the help of $\psi$-meson angular distributions and the distributions by final
muon kinematical variables it is possible to determine the spin of the decaying
$\chi_b$-meson. These distributions can also give an additional information
about $\psi$-meson wave functions.


title:
The $alpha alpha_s^2$ corrections to the first moment of the polarized
  virtual photon structure function $g_1^gamma(x,Q^2,P^2)$

abstract:
  We present the next-to-next-to-leading order ($alpha alpha_s^2$) corrections
to the first moment of the polarized virtual photon structure function
$g_1^gamma(x,Q^2,P^2)$ in the kinematical region $Lambda^2 ll P^2 ll Q^2$,
where $-Q^2(-P^2)$ is the mass squared of the probe (target) photon and
$Lambda$ is the QCD scale parameter. In order to evaluate the three-loop-level
photon matrix element of the flavor singlet axial current, we resort to the
Adler-Bardeen theorem for the axial anomaly and we calculate in effect the
two-loop diagrams for the photon matrix element of the gluon operator. The
$alpha alpha_s^2$ corrections are found to be about 3% of the sum of the
leading order ($alpha$) andthe next-to-leading order ($alpha alpha_s$)
contributions, when $Q^2=30 sim 100 {rm GeV}^2$and $P^2=3{rm GeV}^2$, and the
number of active quark flavors $n_f$ is three to five.


title:
Can collisional energy loss explain nuclear suppression factor for light
  hadrons ?

abstract:
  We argue that in the measured $p_T$ domain of RHIC, collisional rather than
the radiative energy loss is the dominant mechanism for jet quenching.
Accordingly we calculate nuclear suppression factor for light hadrons by taking
only the elastic energy loss in sharp contrast with the previous calculations
where only the radiative loss are considered.


title: Gravitinos from Heavy Scalar Decay

abstract:
  Cosmological issues of the gravitino production by the decay of a heavy
scalar field $X$ are examined, assuming that the damped coherent oscillation of
the scalar once dominates the energy of the universe. The coupling of the
scalar field to a gravitino pair is estimated both in spontaneous and explicit
supersymmetry breaking scenarios, with the result that it is proportional to
the vacuum expectation value of the scalar field in general. Cosmological
constraints depend on whether the gravitino is stable or not, and we study each
case separately. For the unstable gravitino with $M_{3/2} \sim$ 100GeV--10TeV,
we obtain not only the upper bound, but also the lower bound on the reheating
temperature after the $X$ decay, in order to retain the success of the big-bang
nucleosynthesis. It is also shown that it severely constrains the decay rate
into the gravitino pair. For the stable gravitino, similar but less stringent
bounds are obtained to escape the overclosure by the gravitinos produced at the
$X$ decay. The requirement that the free-streaming effect of such gravitinos
should not suppress the cosmic structures at small scales eliminates some
regions in the parameter space, but still leaves a new window of the gravitino
warm dark matter. Implications of these results to inflation models are
discussed. In particular, it is shown that modular inflation will face serious
cosmological difficulty when the gravitino is unstable, whereas it can escape
the constraints for the stable gravitino. A similar argument offers a solution
to the cosmological moduli problem, in which the moduli is relatively heavy
while the gravitino is light.


title: Is unbiasing estimators always justified ?

abstract:
  It is argued that systematically unbiassing estimators is not always
justified and can be counter-productive. On the contrary, a general rule is
given to build a (slightly) biased but consistent estimator which is always
closer to the value being estimated than the unbiased estimator from which one
has started.


title: The Stability of Strange Star Crusts and Strangelets

abstract:
  We construct strangelets, taking into account electrostatic effects,
including Debye screening, and arbitrary surface tension sigma of the interface
between vacuum and quark matter. We find that there is a critical surface
tension sigma_crit below which large strangelets are unstable to fragmentation
and below which quark star surfaces will fragment into a crystalline crust made
of charged strangelets immersed in an electron gas. We derive a
model-independent relationship between sigma_crit and two parameters that
characterize any quark matter equation of state. For reasonable model equations
of state, we find sigma_crit typically of order a few MeV/fm^2. If sigma <=
sigma_crit, the size-distribution of strangelets in cosmic rays could feature a
peak corresponding to the stable strangelets that we construct.


title:
PDF and scale uncertainties of various DY distributions in ADD and RS
  models at hadron colliders

abstract:
  In the extra dimension models of ADD and RS we study the dependence of the
various parton distribution functions on observable of Drell-Yan process to NLO
in QCD at LHC and Tevatron energies. Uncertainties at LHC due to factorisation
scales in going from leading to next-to-leading order in QCD for the various
distributions get reduced by about 2.75 times for a $\mu_F$ range $0.5 ~Q <
\mu_F < 1.5 ~Q$. Further uncertainties arising from the error on experimental
data are estimated using the MRST parton distribution functions.


title: Magnetic Fields Boosted by Gluon Vortices in Color Superconductivity

abstract:
  We investigate the effects of an external magnetic field in the gluon
dynamics of a color superconductor with three massless quark flavors. In the
framework of gluon mean-field theory at asymptotic densities, we show that the
long-range component $\widetilde{H}$ of the external magnetic field that
penetrates the CFL phase produces an instability when its strength becomes
larger than the Meissner mass of the charged gluons. As a consequence, the
magnetic field causes the formation of a vortex state characterized by the
condensation of charged gluons and the creation of magnetic flux tubes. Inside
the flux tubes the magnetic field is stronger than the applied one. This
antiscreening effect is connected to the anomalous magnetic moment of the gluon
field. We suggest how this same mechanism could serve to remove the
chromomagnetic instabilities existing in gapless color superconductivity.


title: Interactions of Q-balls and matter

abstract:
  We know from previous work \cite{clark} that non topological solitons, Q
balls, evaporate into fermions. All the constructions we used to find
evaporation rate were dased on the fact that no fermions would move towards the
Q ball. All these constructions left an opened question that is : what happens
when a fermion interacts with a Q ball. We shall answer this question in this
work by using the constructions done to compute evaporation rates. We shall
also obtain a new approach to compute evaporation rates.


title:
Shear Viscosity to Entropy Density Ratio of QCD below the Deconfinement
  Temperature

abstract:
  Using chiral perturbation theory we investigate the QCD shear viscosity to
entropy density ratio below the deconfinement temperature (~170 MeV) with zero
baryon number density. It is found that the viscosity to entropy density ratio
of QCD is monotonically decreasing in temperature (T) and reaches 0.6 with
estimated ~50% uncertainty at T=120 MeV. A naive extrapolation of the leading
order result shows that the ratio reaches the 1/(4 pi) minimum bound proposed
by Kovtun, Son, and Starinets using string theory methods at T~200 MeV. This
suggests a phase transition or cross over might occur at T less than 200 MeV in
order for the bound to remain valid. Also, it is natural for the ratio to stay
close to the minimum bound around the phase transition temperature as was
recently found in heavy ion collisions.


title:
{PQCD analysis of exclusive $e^+e^-\to D_{[s]}^+D_{[s]}^-$ cross section
  at $\sqrt{s}=10.6$ GeV

abstract:
  We analyze the exclusive pseudoscalar $D_{[s]}^+D_{[s]}^-$ pair production in
$e^+e^-$ annihilations at $\sqrt{s}=10.6$ GeV using a non-factorized PQCD with
the light-front wave function that goes beyond the peaking approximation. We
compare our non-factorized analysis with the usual factorized analysis based on
the peaking approximation in the calculation of the cross section for the heavy
meson pair production. We also discuss the higher helicity contribution to the
cross section. Our analysis provides a constraint on the size of quark
transverse momentum inside the $D$ meson from the recent Belle data,
$\sigma_{\rm Exp.}(e^+e^-\to D^+D^-)<0.04$.


title: Moduli Decays and Gravitinos

abstract:
  One proposed solution of the moduli problem of string cosmology requires that
the moduli are quite heavy, their decays reheating the universe to temperatures
above the scale of nucleosynthesis. In many of these scenarios, the moduli are
approximately supersymmetric; it is then crucial that the decays to gravitinos
are helicity suppressed. In this paper, we discuss situations where these
decays are, and are not, suppressed. We also comment on a possible gravitino
problem from inflaton decay.


title: X(1812) in Quarkonia-Glueball-Hybrid Mixing Scheme

abstract:
  Recently a $J^{PC}=0^{++}$ (X(1812)) state with a mass near the threshold of
$\omega$ and $\phi$ has been observed by the BES collaboration in $J/\psi \to
\gamma \omega \phi$ decay. It has been suggested that it is a $I^G = 0^+$
state. If it is true, this state fits in a mixing scheme based on quarkonia,
glueball and hybrid (QGH) very nicely where five physical states are predicted.
Together with the known $f_0(1370)$, $f_0(1500)$, $f_0(1710)$, and $f_0(1790)$
states, X(1812) completes the five members in this family. Using known
experimental data on these particles we determine the ranges of the mixing
parameters and predict decay properties for X(1812). We also discuss some
features which may be able to distinguish between four-quark and hybrid mixing
schemes.


title:
Comment on ``Improved Calculation of Electroweak Radiative Corrections
  and the Value of $V_{ud}$ by Marciano and Sirlin''

abstract:
  In a recent letter Marciano and Sirlin (Phys. Rev. Lett. 96, 032002, (2006))
presented an improved calculation of the electroweak radiative correction to
derive a precision value of the quark mixing angle $V_{ud}$ by improving the
continuation from long to short distance contributions. At the precision level
considered by them, however, there is a more important contribution from weak
magnetism that was not included by their calculation. The addition of the weak
magnetism contribution to the superallowed beta-decay radiative corrections
lowers $V_{ud}$ by 0.00023, which is compared with the increase 0.00007 of
Marciano and Sirlin and their error estimate $\pm 0.0002$.


title:
Photon propagation in magnetic and electric fields with
  scalar/pseudoscalar couplings: a new look

abstract:
  We consider the minimal coupling of two photons to neutral scalar and
pseudoscalar fields, as for instance in the case of the Higgs boson and axion,
respectively. In this framework, we analyze the photon dispersion relations in
the presence of static and homogeneous external magnetic and electric fields,
by taking into account the contribution of the imaginary part of the
scalar/pseudoscalar self-energy. We show that this contribution cannot be
neglected when it is of the same order as the photon-scalar/pseudoscalar mixing
term. In addition to the usual light-like photon propagation mode, with a
refraction index n > 1, a massive mode with mass of the order of the coupled
boson mass can be induced, provided that the external field is above a
particular critical value. Depending on the values of the external field,
photon energy, and mass of the scalar/pseudoscalar particle, the
scalar/pseudoscalar width could induce a sizeable rate of photon splitting in
two photons due to a strong resonant phenomenon. This effect has no practical
laboratory applications for the Higgs physics due to the very large critical
external magnetic or electric fields involved, for a photon energy of the order
of a TeV. However, it can have relevant consequences in the axion physics or in
any other scenario where light neutral scalar/pseudoscalar fields have minimal
coupling with two photons.


title:
Contributions from dimension six strong flavor changing operators to top
  anti-top, top plus gauge boson, and top plus Higgs boson production at the
  LHC

abstract:
  We study the effects of a set of dimension six flavor changing effective
operators on several processes of production of top quarks at the LHC. Namely,
top anti-top production and associated production of a top and a gauge or Higgs
boson. Analytical expressions for the cross sections of these processes are
derived and presented.


title:
A Simple Parameterization of the Cosmic-Ray Muon Momentum Spectra at the
  Surface as a Function of Zenith Angle

abstract:
  The designs of many neutrino experiments rely on calculations of the
background rates arising from cosmic-ray muons at shallow depths. Understanding
the angular dependence of low momentum cosmic-ray muons at the surface is
necessary for these calculations. Heuristically, from examination of the data,
a simple parameterization is proposed, based on a straighforward scaling
variable. This in turn, allows a universal calculation of the differential muon
intensity at the surface for all zenith angles and essentially all momenta.


title:
Nuclear Effects in Deep Inelastic Scattering of Charged-Current Neutrino
  off Nuclear

abstract:
  Nuclear effect in the neutrino-nucleus charged-Current inelastic scattering
process is studied by analyzing the CCFR and NuTeV data. Structure functions
$F_2(x,Q^2)$ and $xF_3(x,Q^2)$ as well as differential cross sections are
calculated by using CTEQ parton distribution functions and EKRS and HKN nuclear
parton distribution functions, and compared with the CCFR and NuTeV data. It is
found that the corrections of nuclear effect to the differential cross section
for the charged-current anti-neutrino scattering on nucleus are negligible, the
EMC effect exists in the neutrino structure function $F_2(x,Q^2)$ in the large
$x$ region, the shadowing and anti-shadowing effect occurs in the distribution
functions of valence quarks in the small and medium $x$ region,respectively. It
is also found that shadowing effects on $F_2(x,Q^2)$ in the small $x$ region in
the neutrino-nucleus and the charged-lepton-nucleus deep inelastic scattering
processes are different. It is clear that the neutrino-nucleus deep inelastic
scattering data should further be employed in restricting nuclear parton
distributions.


title: Precise Prediction for M_W in the MSSM

abstract:
  We present the currently most accurate evaluation of the W boson mass, M_W,
in the Minimal Supersymmetric Standard Model (MSSM). The full complex phase
dependence at the one-loop level, all available MSSM two-loop corrections as
well as the full Standard Model result have been included. We analyse the
impact of the different sectors of the MSSM at the one-loop level with a
particular emphasis on the effect of the complex phases. We discuss the
prediction for M_W based on all known higher-order contributions in
representative MSSM scenarios. Furthermore we obtain an estimate of the
remaining theoretical uncertainty from unknown higher-order corrections.


title:
Mass formula for leptons and quarks as suggested by generalized Dirac's
  square root

abstract:
  Basing on the formalism of generalized Dirac equation introduced by the
author already many years ago, we suggest a model of formal intrinsic
interactions within leptons and quarks of three generations. In this model, the
leptons and quarks are treated as some intrinsic composites of algebraic
partons, the latter being identified with Dirac bispinor indices appearing in
the generalized Dirac equation. This intrinsic model implies a universal mass
formula for leptons and quarks of three generations that has been recently
proposed on an essentially empirical level.


title: Ultraviolet avalanche in anisotropic non-Abelian plasmas

abstract:
  We present solutions of coupled particle-field evolution in classical U(1)
and SU(2) gauge theories in real time on three-dimensional lattices. For
strongly anisotropic particle momentum distributions, we find qualitatively
different behavior for the two theories when the field strength is high enough
that non-Abelian self-interactions matter for SU(2). It appears that the energy
drained by a Weibel-like plasma instability from the particles does not build
up exponentially in transverse magnetic fields but instead returns,
isotropically, to the hard scale via a rapid avalanche into the ultraviolet.


title: Relic density of neutralino dark matter in the MSSM with CP violation

abstract:
  We calculate the relic density of dark matter in the MSSM with CP violation.
We analyse various scenarios of neutralino annihilation: the cases of a bino,
bino-wino and bino-Higgsino LSP, annihilation through Higgs, as well as
sfermion coannihilation scenarios. Large phase effects are found, on the one
hand due to shifts in the masses, on the other hand due to modifications of the
couplings. Taking special care to disentangle the effects in masses and
couplings, we demonstrate that the presence of CP phases can have a significant
influence on the neutralino relic abundance. Typical variations in \Omega h^2
solely from modifications in the couplings are O(10%-100%), but can reach an
order of magnitude in some cases.


title:
Search for Higher Dimensions through their Gravitational Effects in High
  Energy Collisions

abstract:
  We consider the use of a microwave parametric converter for the direct
detection of gravitational effects at the LHC. Because of the extra dimensions
the strength of the gravitational interaction in the bulk grows at high
energies. This leads to possibly detectable signals.


title:
Cosmological evolution in brane-worlds with large transverse dimensions:
  Inflation and dark matter

abstract:
  In the present work we discuss inflation, dark matter and cosmological
evolution in the context of the brane-world scenario. Being string theory
inspired, the brane-world models provide corrections to the General Relativity,
which is considered to be the low-energy limit of string theory. We find that
novel cosmologies are obtained, which potentially can provide answers to some
of the longstanding problems of modern cosmology, such as the origin and nature
of dark energy. At the same time the successes of the standard four-dimensional
cosmology are preserved, and in some cases the treatment in the framework of
brane cosmology is even more satisfactory.


title:
Double-spin asymmetry in elastic proton-proton scattering as a probe for
  the Odderon

abstract:
  The magnitude of the double-spin asymmetry A_{NN} in polarized proton elastic
scattering is estimated using results from an earlier determination of the
spin-flip coupling of the leading Regge poles (cf. T.L.Trueman, Proceedings of
the 16th International Spin Physics Symposium SPIN 2004, eds. F. Bradamante et
al, World Scientific, 2005.) The required Regge cuts are estimated using the
absorptive Regge model. This estimate is then used to determine the sensitivity
of experiments at RHIC to the presence of the Odderon.


title:
Dark Matter in Universal Extra Dimension Models: $\gamma_{KK}$ vrs
  $\nu_{R,KK}$

abstract:
  We show that in a class of universal extra dimension models (UED), which
solves both the neutrino mass and proton decay problem, an admixture of KK
photon and KK right handed neutrinos can provide the required amount of cold
dark matter (CDM). This model has two parameters $R^{-1}$ and $M_{Z'}$ ($R$ is
the radius of the extra space dimensions and $Z'$ the extra neutral gauge boson
of the model). Using the value of the relic CDM density, combined with the
results from the cryogenic searches for CDM, we obtain upper limits on $R^{-1}$
of about 400-650 GeV and $M_{Z'}\leq 1.5$ TeV, both being accessible to LHC. In
some regions of the parameter space, the dark matter-nucleon scattering cross
section can be as high as of $10^{-44}$ cm$^2$, which can be probed by the next
round of dark matter search experiments.


title: Non-local effects at the onset of the chiral transition

abstract:
  Inspired by analytic results obtained for a systematic expansion of the
memory kernel in dissipative quantum mechanics, we propose a phenomenological
procedure to incorporate non-markovian corrections to the Langevin dynamics of
an order parameter in field theory systematically. In this note, we restrict
our analysis to the onset of the evolution. As an example, we consider the
process of phase conversion in the chiral transition.


title: SM and MSSM Higgs Boson Production: Spectra at large transverse Momentum

abstract:
  Strategies for Higgs boson searches require the knowledge of the total
production cross section and the transverse momentum spectrum. The large
transverse momentum spectrum of the Higgs boson produced in gluon fusion can be
quite different in the Standard Model and the Minimal Supersymmetric Standard
Model. In this paper we present a comparison of the Higgs transverse momentum
spectrum obtained using the PYTHIA event generator and the HIGLU program as
well as the program HQT, which includes NLO corrections and a soft gluon
resummation for the region of small transverse momenta. While the shapes of the
spectra are similar for the Standard Model, significant differences are
observed in the spectra of Minimal Supersymmetric Standard Model benchmark
scenarios with large tan(beta).


title:
Baryon charge transfer and production asymmetry between Lambda^0 and
  antiLambda^0 in hadron interactions

abstract:
  The predictions were done for asymmetry between production spectra of
Lambda^0 and antiLambda^0 at the energy of LHC experiments. The value of A(s)
should be situated in the band between two curves that are calculated in
Quark-Gluon String Model with two possible values of intercept
alpha_{SJ}(0)=0,5 and 0,9. Both curves describe the asymmetries measured at
lower energies up to RHIC experiments. The data of H1 experiment can be fitted
only with alpha_{SJ}(0)=0,9.


title: Single parameter quasi-particle model for QGP

abstract:
  We discuss a new single parameter quasi-particle model and study the
thermodynamics of (2+1)-flavor quark gluon plasma (QGP). Our model with a
single parameter explains remarkably well the lattice simulation results of
Fodor et. al. Phys. Lett. B568, 73 (2003).


title: Top transport in electroweak baryogenesis

abstract:
  In non-supersymmetric models of electroweak baryogenesis the top quark plays
a crucial role. Its CP-violating source term can be calculated in the WKB
approximation. We point out how to resolve certain discrepancies between
computations starting from the Dirac equation and the Schwinger--Keldysh
formalism. We also improve on the transport equations, keeping the
W-scatterings at finite rate. We apply these results to a model with one Higgs
doublet, augmented by dimension-6 operators, where our refinements lead to an
increase in the baryon asymmetry by a factor of up to about 5.


title:
QCD Corrections to Semi-Inclusive Hadron Production in Electron-Positron
  Annihilation at Two Loops

abstract:
  We report on the analytic calculation of the second-order QCD corrections to
semi-inclusive hadron production in electron-positron annihilation. The
calculation of the single-particle inclusive cross-section in time-like
kinematics is performed in Mellin N-space and uses an algorithmic evaluation of
inclusive phase-space integrals, based on the unitarity cutting rules and
integration-by-parts. We obtain splitting functions and coefficient functions
up to second order in the strong coupling alpha_s. Our results are in agreement
with earlier calculations in the literature by Rijken and van Neerven.


title: Hybrid meson properties in Lattice QCD and Flux Tube Models

abstract:
  Flux tube model predictions for hybrid meson decays are beginning to be
confronted by Lattice QCD. We compare the two approaches for the $S$-wave decay
of the exotic $1^{-+}$, and find excellent agreement. Results suggest that in
Strong QCD, \qq~ creation occurs with S=1.


title: Little Higgs model effects at $\gamma \gamma$ collider

abstract:
  Though the predictions of the Standard Model (SM) are in excellent agreement
with experiments there are still several theoretical problems, such as
fine-tuning and the hierarchy problem. These problems are associated with the
Higgs sector of the SM, where it is widely believed that some {\it ``new
physics"} will take over at the TeV scale. One beyond the SM theory which
resolves these problems is the Little Higgs (LH) model. In this work we shall
investigate the effects of the LH model on $\gggg$ scattering; where the
process $\gggg$ at high energies occurs in the SM through diagrams involving
$W$, charged quark and lepton loops (and is, therefore, particularly sensitive
to any new physics


title:
Experimental Constraints on Scharm-Stop Flavor Mixing and Implications
  in Top-quark FCNC Processes

abstract:
  We examine experimental constraints on scharm-stop flavor mixing in the
minimal supersymmetric standard model, which arise from the experimental bounds
on squark and Higgs boson masses, the precision measurements of W-boson mass
and the effective weak mixing angle, as well as the experimental data on
B_s-\bar B_s mixing and b -> s gamma. We find that the combined analysis can
put rather stringent constraints on \tilde{c}_L-\tilde{t}_L and
\tilde{c}_L-\tilde{t}_R mixings. As an illustration for the effects of such
constraints, we examine various top-quark flavor-changing neutral-current
processes induced by scharm-stop mixings at the LHC and find that their maximal
rates are significantly lowered.


title:
Probing the convergence of perturbative series in baryon chiral
  perturbation theory

abstract:
  Using the examples of pion-nucleon scattering and the nucleon mass we analyze
the convergence of perturbative series in the framework of baryon chiral
perturbation theory. For both cases we sum up sets of an infinite number of
diagrams by solving equations exactly and compare the solutions with the
perturbative contributions.


title: Quantum Chromodynamics

abstract:
  After a brief historical review of the emergence of QCD as the quantum field
theory of strong interactions, the basic notions of colour and gauge invariance
are introduced leading to the QCD Lagrangian. The second lecture is devoted to
perturbative QCD, from tree-level processes to higher-order corrections in
renormalized perturbation theory, including jet production in e+ e-
annihilation, hadronic tau decays and deep inelastic scattering. The final two
lectures treat various aspects of QCD beyond perturbation theory. The main
theme is effective field theories, from heavy quarks to the light quark sector
where the spontaneously broken chiral symmetry of QCD plays a crucial role.


title:
Next-to-leading-logarithmic QCD Corrections to the Cross Section
  sigma(e+e- to t bar t H) at 500 GeV

abstract:
  We determine the next-to-leading logarithmic (NLL) QCD corrections to the
cross section sigma(e+e- to t bar t H) for center-of-mass energies up to 500
GeV. The dynamics is dominated by nonrelativistic effects, and the summation of
terms singular in the relative t bar t velocity is mandatory to all orders in
the strong coupling constant alpha_s using an effective theory. The summations
lead to an enhancement of the tree level predictions by about a factor of two
and are important for the determination of the top Yukawa coupling. We also
study the impact of polarization of the electron-positron beams and provide a
fast approximation formula for the known O(alpha_s) QCD fixed-order prediction.


title: $D^* D_s K$ and $D_s ^* D K$ vertices in a QCD Sum Rule approach

abstract:
  We calculate the strong form factors and coupling constants of $ D^* D_s K$
and $D_s^* D K$ vertices using the QCD sum rules technique. In each case we
have considered two different cases for the off-shell particle in the vertex:
the ligthest meson and one of the heavy mesons. The method gives the same
coupling constant for each vertex. When the results for different vertices are
compared, they show that the SU(4) symmetry is broken by around 40%.


title: Neutralino Dark Matter in the Left-Right Supersymmetric Model

abstract:
  We study the neutralino sector of the left-right supersymmetric model. In
addition to the possibilities available in the minimal supersymmetric model,
the neutralino states can be superpartners of the U(1)_{B-L} gauge boson, the
neutral SU(2)_R neutral gauge boson, or of the Higgs triplets. We analyze
neutralino masses and determine the parameter regions for which the lightest
neutralino can be one of the new pure states. We then calculate the relic
density of the dark matter for each of these states and impose the constraints
coming from the rho parameter, the anomalous magnetic moment of the muon, b ->
s gamma, as well as general supersymmetric mass bounds. The lightest neutralino
can be the bino, or the right-wino, or the neutral triplet higgsino, all of
which have different couplings to the standard model particles from the usual
neutralinos. A light bino satisfies all the experimental constraints and would
be the preferred dark matter candidate for light supersymmetric scalar masses,
while the right-wino would be favored by intermediate supersymmetric mass
scales. The neutral triplet Higgs fermion satisfies the experimental bounds
only in a small region of the parameter space, for intermediate to heavy
supersymmetric scalar masses.


title: A schematic model of neutrinos

abstract:
  We show that the observed pattern for neutrino mixing arises naturally if
neutrinos are composites of more elementary constituents carrying an SU(2)
quantum number we call lepospin.


title: Rare top quark decays in extended models

abstract:
  Flavor changing neutral currents (FCNC) decays t to H + c, t to Z + c, and H
to t + bar{c} are discussed in the context of Alternative Left-Right symmetric
Models (ALRM) with extra isosinglet heavy fermions where FCNC decays may take
place at tree-level and are only suppressed by the mixing between ordinary top
and charm quarks, which is poorly constraint by current experimental values.
The non-manifest case is also briefly discussed.


title:
The two-loop supersymmetric corrections to lepton anomalous magnetic and
  electric dipole moments

abstract:
  Using the effective Lagrangian method, we analyze the electroweak corrections
to the anomalous dipole moments of lepton from some special two-loop
topological diagrams which are composed of neutralino (chargino) - slepton
(sneutrino) in the minimal supersymmetric extension of the standard model
(MSSM). Considering the translational invariance of the inner loop momenta and
the electromagnetic gauge invariance, we get all dimension 6 operators and
derive their coefficients. After applying equations of motion to the external
leptons, the anomalous dipole moments of lepton are obtained. The numerical
results imply that there is a parameter space where the two-loop supersymmetric
corrections to the muon anomalous dipole moments may be significant.


title: Investigation of the nuetralino pair production at LHC

abstract:
  In this article, we investigate the Drell-Yan process of the light neutralino
pair $\widetilde{\chi}_{i}^{0}\widetilde{\chi}_{j}^{0}$ ($i,j=1,2$) productions
at proton-proton collisions and we present the general formulate for the
differential cross sections. We conduct an extensive examination of the
dependence of the total cross section of the subprocesses $q \bar q \to
\widetilde \chi_{i}^{0}\widetilde\chi_{j}^{0}$ on the beam energy, on the mass
of the squarks and also on the $M_2$ gaugino for the three extremely different
scenarios. For all three cases, the outcomes are as follows. The dependence of
the total cross section of the subprocesses $q \bar q \to \widetilde
\chi_{i}^{0} \widetilde \chi_{j}^{0}$ on the beam energy is dominated by one of
the subprocesses, $q \bar q \to \widetilde \chi_{1}^{0} \widetilde
\chi_{2}^{0}$. On the other hand, the dependence of the total cross section of
the subprocesses $q \bar q \to \widetilde \chi_{i}^{0} \widetilde \chi_{j}^{0}$
on the mass of the squarks is dominated by one of the subprocesses, $q \bar q
\to \widetilde \chi_{1}^{0} \widetilde \chi_{2}^{0}$. We derive there from that
our findings may lead to new insights relating to experimental investigations
and these dependencies may be used as bases of an experimental research for the
neutralino pair at LHC.


title:
Proton and anti-proton production in the forward region of d+Au
  collisions at RHIC from the color glass condensate

abstract:
  The power-law tail of high-pt pi^\pm spectra observed in forward d+Au
collisions at RHIC can be attributed to the power-law decrease of the dipole
forward scattering amplitude appearing in the color glass condensate (CGC)
approach. Forward particle production probes the small-x gluon distribution of
the target nucleus where its anomalous dimension is rather flat (gamma = 0.6
\sim 0.8) for moderately high pt (\lsim 5 GeV), and where the leading-twist
DGLAP approximation is not valid. In the same framework, we examine p and
\bar{p} production using baryon fragmentation functions parameterized in the
Lund fragmentation scheme. This provides a good description of the forward
\bar{p} spectrum while it underestimates the p data by as much as a factor of 2
\sim 3 at pt \lsim 4 GeV. Part of this anomalous baryon excess can be
attributed to surviving constituent diquarks from the deuteron projectile.
Thus, the contribution from diquark scattering may play an essential role for
forward baryon formation.


title: Explosive Z Pinch

abstract:
  We propose an explanation for the recently observed powerful contained
explosion in a Z pinch experiment performed at Sandia National Laboratories.
Our arguments are based on the assumption that a pure SU(2) Yang-Mills theory
of scale $\sim 0.5 $MeV is responsible for the emergence of the electron and
its neutrino.


title: Decoupling Spurious Baryon States in the 1/N_c Expansion of QCD

abstract:
  We identify ``spurious'' states in meson-baryon scattering, those that appear
in QCD for N_c > 3 but decouple for N_c = 3. The key observation is that the
relevant flavor SU(3) Clebsch-Gordan coefficients contain factors of 1 - 3/N_c.
We show that this method works even if SU(3) is badly broken. We also observe
that resonant scattering poles lying outside naive quark model multiplets are
not necessarily large N_c artifacts, and can survive via configuration mixing
at N_c = 3.


title:
Double transverse-spin asymmetries in Drell--Yan and $J/\psi$ production
  from proton--antiproton collisions

abstract:
  We perform a NLO numerical study of the double transverse-spin asymmetries in
the $J/\psi$ resonance region for proton--antiproton collisions. We analyze the
large $x$ kinematic region, relevant for the proposed PAX experiment at GSI,
and discuss the implication of the results for the extraction of the
transversity densities.


title: Drell-Yan Lepton Angular Distribution at Small Transverse Momentum

abstract:
  We investigate the dependence of the Drell-Yan cross section on lepton polar
and azimuthal angles, as generated by the lowest-order QCD annihilation and
Compton processes. We focus in particular on the azimuthal-angular
distributions, which are of the form cos(phi) and cos(2phi). At small
transverse momentum q_T of the lepton pair, q_T << Q, with Q the pair mass,
these terms are known to be suppressed relative to the phi-independent part of
the Drell-Yan cross section by one or two powers of the transverse momentum.
Nonetheless, as we show, like the phi-independent part they are subject to
large logarithmic corrections, whose precise form however depends on the
reference frame chosen. These logarithmic contributions ultimately require
resummation to all orders in the strong coupling. We discuss the potential
effects of resummation on the various angular terms in the cross section and on
the Lam-Tung relation.


title:
D-Dbar Correlations as a sensitive probe for thermalization in
  high-energy nuclear collisions

abstract:
  We propose to measure azimuthal correlations of heavy-flavor hadrons to
address the status of thermalization at the partonic stage of light quarks and
gluons in high-energy nuclear collisions. In particular, we show that hadronic
interactions at the late stage cannot significantly disturb the initial
back-to-back azimuthal correlations of DDbar pairs. Thus, a decrease or the
complete absence of these initial correlations does indicate frequent
interactions of heavy-flavor quarks and also light partons in the partonic
stage, which are essential for the early thermalization of light partons.


title: Surface structure of Quark stars with magnetic fields

abstract:
  We investigate the impact of magnetic fields on the electron distribution in
the electrosphere of quark stars. For moderately strong magnetic fields $B\sim
10^{13}$G, quantization effects are generally weak due to the large number
density of electrons at surface, but can nevertheless affect the spectral
features of quark stars. We outline the main observational characteristics of
quark stars as determined by their surface emission, and briefly discuss their
formation in explosive events termed Quark-Novae, which may be connected to the
$r$-process.


title: Indications of the CMSSM Mass Scale from Precision Electroweak Data

abstract:
  We discuss the sensitivities of present-day electroweak precision data to the
possible scale of supersymmetry within the constrained minimal supersymmetric
extension of the Standard Model (CMSSM). Our analysis is based on M_W, sin^2
theta_eff, (g-2)_mu, BR(b -> s gamma), and the lightest MSSM Higgs boson mass,
M_h. We display the impact of the recent reduction in m_t from 178.0 +- 4.3 GeV
to 172.7 +- 2.9 GeV on the interpretation of the precision observables. We show
the currently preferred values of the CMSSM mass scale m_{1/2} based on a
global chi^2 fit, assuming that the lightest supersymmetric particle (LSP) is a
neutralino, and fixing m_0 so as to obtain the cold dark matter density allowed
by WMAP and other cosmological data for specific values of A_0, tan beta and mu
> 0. The recent reduction in m_t reinforces previous indications for relatively
light soft supersymmetry-breaking masses, offering good prospects for the LHC
and the ILC, and in some cases also for the Tevatron. Finally, we discuss the
sensitivity of the global chi^2 function to possible future evolution in the
experimental central value of m_t and its error.


title:
Sum rules of polarized photon structure functions revisited-- NNLO
  corrections to the first moment of $g_1^\gamma (x,Q^2,P^2)$ --

abstract:
  We present the next-to-next-to-leading order ($\alpha \alpha_s^2$)
corrections to the first moment of the polarized virtual photon structure
function $g_1^\gamma(x,Q^2,P^2)$ in the kinematical region $Q^2\gg P^2 \gg
\Lambda^2$ in QCD. We find that the $\alpha \alpha_s^2$ corrections are about
3% of the sum of the leading ($\alpha$) and the next-to-leading
($\alpha\alpha_s$) contributions, when $Q^2=30\sim 100 {\rm GeV}^2$ and $P^2=3
{\rm GeV}^2$.


title: Atmospheric neutrinos in a Large Liquid Argon detector

abstract:
  In view of the evaluation of the physics goals of a large Liquid Argon TPC,
evolving from the ICARUS technology, we have studied the possibility of
performing precision measurements on atmospheric neutrinos. For this purpose we
have improved existing Monte Carlo neutrino event generators based on FLUKA and
NUX by including the 3-flavor oscillation formalism and the numerical treatment
of Earth matter effects. By means of these tools we have studied the
sensitivity in the measurement of Theta(23) through the accurate measurement of
electron neutrinos. The updated values for Delta m^2(23) from Super-Kamiokande
and the mixing parameters as obtained by solar and KamLand experiments have
been used as reference input, while different values of Theta(13) have been
considered. An exposure larger than 500 kton yr seems necessary in order to
achieve a significant result, provided that the present knowledge of systematic
uncertainties is largely improved.


title: Production of Doubly Charged Higgs Bosons at Linear e-e- Colliders

abstract:
  Production of doubly charged Higgs bosons via the s-channel process e-e- ->
H-- -> l-l- at future linear collider energies is studied by taking into
account initial state radiation (ISR) and beamstrahlung (ISR + BS), final state
radiation (FSR) and detector smearing effects. The discovery bounds of lepton
flavour conserving and violating couplings are obtained for doubly charged
Higgs bosons. It is found that future linear colliders with centre of mass
energies and will be able to probe the doubly charged Higgs bosons with
diagonal couplings down to 10^-4 and 10^-3, respectively.


title: Elliptic Flow in a Final State Interaction Model

abstract:
  We propose a final state interaction model to describe the fixed $p_T$
suppression of the yield of particles at all values of $p_T$. We make an
extension of the model to the motion in the transverse plane which introduces a
dependence of the suppression on the azimuthal angle $\theta_R$. We obtain
values of the elliptic flow $v_{2}$ close to the experimental ones for all
values of $p_T$.


title: Top Threshold Physics

abstract:
  Running a future Linear Collider at the top pair threshold allows for precise
measurements of the mass, the widths and the couplings of the top quark. I give
a nontechnical review on recent theoretical developments and the theory status
in top threshold physics concerning QCD corrections and top quark finite
lifetime and electroweak effects. I also discuss threshold physics in the
context of measurements of the top Yukawa coupling from $e^+e^-\to t\bar t H$
and of squark pair production.


title:
Comment on "Truncated Schwinger-Dyson Equations and Gauge Covariance in
  QED3"

abstract:
  A comment on the paper "Truncated Schwinger-Dyson Equations and Gauge
Covariance in QED3", Few-Body Syst. 41, 185 (2007) [hep-ph/0511291].


title: Recent progress in computing four-loop massive correlators

abstract:
  We report about recent progress in computing four-loop massive correlators.
The expansion of these correlators in the external momentum leads to vacuum
integrals. The calculation of these vacuum integrals can be used to determine
Taylor expansion coefficients of the vacuum polarization function and
decoupling functions in perturbative Quantum chromodynamics. New results at
four-loop order for the lowest Taylor expansion coefficient of the vacuum
polarization function and for the decoupling relation are presented.


title: Long-Lived Staus at Neutrino Telescopes

abstract:
  We perform an exhaustive study of the role neutrino telescopes could play in
the discovery and exploration of supersymmetric extensions of the Standard
Model with a long-lived stau next-to-lightest superparticle. These staus are
produced in pairs by cosmic neutrino interactions in the Earth matter. We show
that the background of stau events to the standard muon signal is negligible
and plays no role in the determination of the cosmic neutrino flux. On the
other hand, one can expect up to 50 pair events per year in a cubic kilometer
detector such as IceCube, if the superpartner mass spectrum and the high-energy
cosmic neutrino flux are close to experimental bounds.


title: Small x Phenomenology - summary of the 3rd Lund Small x Workshop in 2004

abstract:
  A third workshop on small-x physics, within the Small-x Collaboration, was
held in Hamburg in May 2004 with the aim of overviewing recent theoretical
progress in this area and summarizing the experimental status.


title: Electromagnetic quarkonium decays at order v^7

abstract:
  We compute S-wave and P-wave electromagnetic quarkonium decays at order v^7
in the heavy-quark velocity expansion. In the S-wave case, our calculation
confirms and completes previous findings. In the P-wave case, our results are
in disagreement with previous ones; in particular, we find that two matrix
elements less are needed. The cancellation of infrared singularities in the
matching procedure is discussed.


title:
How astrophysical neutrino sources could be used for early measurements
  of neutrino mass hierarchy and leptonic CP phase

abstract:
  We discuss the possible impact of astrophysical neutrino flux measurements at
neutrino telescopes on the neutrino oscillation program of reactor experiments
and neutrino beams. We consider neutrino fluxes from neutron sources, muon
damped sources, and pion sources, where we parameterize the input from these
sources in terms of the flux ratio $R=\phi_\mu/(\phi_e+\phi_\tau)$ which can be
extracted from the muon track to shower ratio in a neutrino telescope. While it
is difficult to obtain any information from this ratio alone, we demonstrate
that the dependence on the oscillation parameters is very complementary to the
one of reactor experiments and neutrino beams. We find that for large values of
$\sin^2 2 \theta_{13}$, a measurement of R with a precision of about 20% or
better may not only improve the measurement of the leptonic CP phase, but also
help the determination of the mass hierarchy. In some cases, early information
on $\delta_{CP}$ may even be obtained from Double Chooz and an astrophysical
flux alone without the help of superbeams. For small values of $\sin^2 2
\theta_{13}$, we find that using the information from an astrophysical neutrino
flux could eliminate the octant degeneracy better than reactor experiments and
beams alone. Finally, we demonstrate that implementing an additional observable
based on the electromagnetic to hadronic shower ratio at a neutrino telescope
(such as at higher energies) could be especially beneficial for pion beam
sources.


title: Prospects for Mirage Mediation

abstract:
  Mirage mediation reduces the fine-tuning in the minimal supersymmetric
standard model by dynamically arranging a cancellation between anomaly-mediated
and modulus-mediated supersymmetry breaking. We explore the conditions under
which a mirage "messenger scale" is generated near the weak scale and the
little hierarchy problem is solved. We do this by explicitly including the
dynamics of the SUSY-breaking sector needed to cancel the cosmological
constant. The most plausible scenario for generating a low mirage scale does
not readily admit an extra-dimensional interpretation. We also review the
possibilities for solving the mu/Bmu problem in such theories, a potential
hidden source of fine-tuning.


title:
Majorana neutrino textures from numerical considerations: the CP
  conserving case

abstract:
  Phenomenological bounds on the neutrino mixing matrix U are used to determine
numerically the allowed range of real elements (CP conserving case) for the
symmetric neutrino mass matrix Mn (Majorana case). For this purpose an adaptive
Monte Carlo generator has been used. Histograms are constructed to show which
forms of the neutrino mass matrix Mn are possible and preferred. We confirm
results found in the literature which are based on analytical calculations,
though a few differences appear. These cases correspond to some textures with
two zeros. The results show that actually both normal and inverted mass
hierarchies are still possible at 3 sigma confidence level.


title: Top Quark Mediated Higgs Decay into Hadrons to Order alpha(s)**5

abstract:
  We present in analytic form the O(alpha_s^5) correction to the H->gg partial
width of the standard-model Higgs boson with intermediate mass M_H<2M_t. Its
knowledge is useful because the O(alpha_s^4) correction is sizeable (around
20%). For M_H=120 GeV, the resulting QCD correction factor reads
  1 + (215/12) alpha_s^(5)(M_H)/pi
  + 152.5 (alpha_s^(5)(M_H)/pi)^2
  + 381.5 (alpha_s^(5)(M_H)/pi)^3
  \approx 1+0.65+0.20+0.02.
  The new four-loop correction increases the total Higgs-boson hadronic width
by a small amount of order 1 promille and stabilizes significantly the residual
scale dependence.


title: Bootstrapping One-Loop QCD Amplitudes with General Helicities

abstract:
  The recently developed on-shell bootstrap for computing one-loop amplitudes
in non-supersymmetric theories such as QCD combines the unitarity method with
loop-level on-shell recursion. For generic helicity configurations, the
recursion relations may involve undetermined contributions from non-standard
complex singularities or from large values of the shift parameter. Here we
develop a strategy for sidestepping difficulties through use of pairs of
recursion relations. To illustrate the strategy, we present sets of recursion
relations needed for obtaining n-gluon amplitudes in QCD. We give a recursive
solution for the one-loop n-gluon QCD amplitudes with three or four
color-adjacent gluons of negative helicity and the remaining ones of positive
helicity. We provide an explicit analytic formula for the QCD amplitude
A_{6;1}(1^-,2^-,3^-,4^+,5^+,6^+), as well as numerical results for
A_{7;1}(1^-,2^-,3^-,4^+,5^+,6^+,7^+), A_{8;1}(1^-,2^-,3^-,4^+,5^+,6^+,7^+,8^+),
and A_{8;1}(1^-,2^-,3^-,4^-,5^+,6^+,7^+,8^+). We expect the on-shell bootstrap
approach to have widespread applications to phenomenological studies at
colliders.


title: Nonlocality effects on Color Spin Locking condensates

abstract:
  We consider the color spin locking (CSL) phase of two-flavor quark matter at
zero temperature for nonlocal instantaneous, separable interactions. We employ
a Lorentzian-type form factor allowing a parametric interpolation between the
sharp (Nambu-Jona-Lasinio (NJL) model) and very smooth (e.g. Gaussian) cut-off
models for systematic studies of the influence on the CSL condensate the
deviation from the NJL model entails. This smoothing of the NJL model form
factor shows advantageous features for the phenomenology of compact stars: (i)
a lowering of the critical chemical potential for the onset of the chiral phase
transition as a prerequisite for stability of hybrid stars with extended quark
matter cores and (ii) a reduction of the smallest pairing gap to the order of
100 keV, being in the range of values interesting for phenomenological studies
of hybrid star cooling evolution.


title: Physics of top

abstract:
  I will briefly review the physics of top quark at high energy colliders. A
new discovery of single-top event at the Fermilab Tevatron is expected. At the
CERN Large Hadron Collider, detailed top quark properties can be measured and
new physics ideas in which top quark plays a special role can be tested. I will
also discuss a few phenomenological methods for analyzing experimental data to
study top quark interactions.


title: Supersymmetric Hybrid Inflation with Non-Minimal Kahler potential

abstract:
  Minimal supersymmetric hybrid inflation based on a minimal Kahler potential
predicts a spectral index n_s\gsim 0.98. On the other hand, WMAP three year
data prefers a central value n_s \approx 0.95. We propose a class of
supersymmetric hybrid inflation models based on the same minimal superpotential
but with a non-minimal Kahler potential. Including radiative corrections using
the one-loop effective potential, we show that the prediction for the spectral
index is sensitive to the small non-minimal corrections, and can lead to a
significantly red-tilted spectrum, in agreement with WMAP.


title: Atomic parity violation in the economical 3-3-1 model

abstract:
  The deviation $\de Q_{\mathrm{W}}$ of the weak charge from its standard model
prediction due to the mixing of the $W$ boson with the charged bilepton $Y$ as
well as of the $Z$ boson with the neutral $Z'$ and the real part of the
non-Hermitian neutral bilepton $X$ in the economical 3-3-1 model is
established. Additional contributions to the usual $\de Q_\mathrm{W}$
expression in the extra $\mathrm{U}(1)$ models and the left-right models are
obtained. Our calculations are quite different from previous analyzes in this
kind of the 3-3-1 models and give the limit on mass of the $Z'$ boson, the
$Z-Z'$ and $W-Y$ mixing angles with the more appropriate values: $M_{Z'} > 564\
\mathrm{GeV}, -0.018<\sin \va < 0$ and $|\sin \theta| < 0.043$.


title:
Next-to-leading order QCD corrections to Z boson pair production via
  vector-boson fusion

abstract:
  Vector-boson fusion processes are an important tool for the study of
electroweak symmetry breaking at hadron colliders, since they allow to
distinguish a light Higgs boson scenario from strong weak boson scattering. We
here consider the channels WW->ZZ and ZZ->ZZ as part of electroweak Z boson
pair production in association with two tagging jets. We present the
calculation of the NLO QCD corrections to the cross sections for p p -> e+ e-
mu+ mu- + 2 jets and p p -> e+ e- nu_mu nubar_mu + 2 jets via vector-boson
fusion at order alpha_s alpha^6, which is performed in the form a NLO
parton-level Monte Carlo program. The corrections to the integrated cross
sections are found to be modest, while the shapes of some kinematical
distributions change appreciably at NLO. Residual scale uncertainties typically
are at the few percent level.


title:
Model Independent Methods for Determining B(Y(5S)->Bs^{(*)}
  anti-B}_s^{(*)})$

abstract:
  We describe a method that provides a model independent measurement of the Bs
fraction in Y(5S) resonance decays, fs, using the relative rates of like-sign
versus opposite sign dileptons; the like-sign leptons result from B^0 and Bs
mixing. In addition, we show that determining the rates of single, double and
triple Ds mesons provides an alternative way of finding fs.


title: Unitarity Triangle from CP invariant quantities

abstract:
  We construct the CKM unitarity triangle from CP invariant quantities, using
the coupling constant of weak decays with flavor change from b to u, and the
particle - antiparticle mixing probability in the B_s and B_d systems. Also
included are new measurements of the coupling V_us in Kaon decays. Of the two
solutions, one agrees perfectly with the triangle constructed from CP violating
processes in the K and B meson systems. The common solution yields a triangle
with an area of J/2 = (1.51 +/- 0.09) x 10^{-5} and a CP violating phase gamma
= 63.1^o +/- 4.0^o.


title:
Extension of the Nambu--Jona-Lasinio model at high densities and
  temperatures by using an implicit regularization scheme

abstract:
  Traditional cutoff regularization schemes of the Nambu--Jona-Lasinio model
limit the applicability of the model to energy-momentum scales much below the
value of the regularizing cutoff. In particular, the model cannot be used to
study quark matter with Fermi momenta larger than the cutoff. In the present
work an extension of the model to high temperatures and densities recently
proposed by Casalbuoni, Gatto, Nardulli, and Ruggieri is used in connection
with an implicit regularization scheme. This is done by making use of scaling
relations of the divergent one-loop integrals that relate these integrals at
different energy-momentum scales. Fixing the pion decay constant at the chiral
symmetry breaking scale in the vacuum, the scaling relations predict a running
coupling constant that decreases as the regularization scale increases,
implementing in a schematic way the property of asymptotic freedom of quantum
chromodynamics. If the regularization scale is allowed to increase with density
and temperature, the coupling will decrease with density and temperature,
extending in this way the applicability of the model to high densities and
temperatures. These results are obtained without specifying an explicit
regularization. As an illustration of the formalism, numerical results are
obtained for the finite density and finite temperature quark condensate, and to
the problem of color superconductivity at high quark densities and finite
temperature.


title: Heavy-Quark Potentials and AdS/QCD

abstract:
  We give an example of modeling phenomenological heavy-quark potentials in a
five-dimensional framework nowadays known as AdS/QCD. In particular we
emphasize the absence of infrared renormalons.


title: On the QCD corrections to Vainshtein's theorem for VVA correlator

abstract:
  We point out that, contrary to existing claims of the opposite, Vainshtein's
theorem on the non-renormalization of the correlator of an axial and two vector
currents, is only valid in the chiral limit. When quarks, that contribute to
the correlator, are massive, the QCD corrections do not vanish and the
transversal and longitudinal functions are renormalized differently. We compute
those corrections and study their implications for QCD effects in electroweak
corrections to the muon anomalous magnetic moment.


title: Quark droplets with chiral symmetry in the Nambu--Jona-Lasinio model

abstract:
  We discuss the stability of strangelets by considering dynamical chiral
symmetry breaking. For quark droplets of finite volume, we formulate the
Nambu--Jona-Lasinio model with a basis set of the quark wave functions in the
chiral bag model. Chiral symmetry breaking for the finite volume bag is
discussed in a mean field approximation. Effects of the pion cloud including
the chiral Casimir effect are investigated. Physical quantities of the quark
droplets such as masses and radii are obtained for quark droplets of baryon
numbers up to five. We also apply our model setting to the nucleon and discuss
the stability of the quark droplets against nuclei.


title: Production of neutral and doubly charged partners of D_{s0}^+(2317)

abstract:
  Production of neutral and doubly charged partners, $\hat F_I^0$ and $\hat
F_I^{++}$, of $ D_{s0}^+(2317)$ as a charm-strange four-quark meson is studied
in relation to observations of $D_{s0}^+(2317)$. It is discussed that
observation of $\hat F_I^{++}$ in inclusive $e^+e^-\to c\bar c$ is difficult
but it might be observed in $B_u^+\to D_s^+\pi^+D^-$. Observations of $\hat
F_I^0$ and $\hat F_0^+$ might be possible in hadronic B decays.


title: Parity-Odd Asymmetries in W-Jet Events at the Tevatron

abstract:
  Parity-odd asymmetries in the decay angular distribution of a W boson
produced with a hard jet in p\bar{p} collisions arise only from QCD
rescattering effects. If observed, these asymmetries will provide a first
demonstration that perturbative QCD calculation is valid for the absorptive
part of scattering amplitudes. We propose a simple observable to measure these
asymmetries and perform realistic Monte Carlo simulations at Tevatron energies.
It is shown that the Tevatron Run-II should provide sufficient statistics to
test the prediction.


title:
Landau-Pomeranchuck-Migdal effect in a quark-gluon plasma and the
  Boltzmann equation

abstract:
  We show how the Landau-Pomeranchuk-Migdal effect on photon production rates
in a quark-gluon plasma can be derived via the usual Boltzmann equation. To do
this, we first derive the electromagnetic polarization tensor using linear
response theory, and then formulate the Boltzmann equation including the
collisions mediated by soft gluon exchanges. We then identify the resulting
expression for the production rate with that obtained by the field-theoretic
formalism recently proposed by Arnold, Moore and Yaffe. To illustrate the LPM
effect we solve the Boltzmann equation in the diffusion approximation.


title: Nucleation in the chiral transition with an inhomogeneous background

abstract:
  We consider an approximation procedure to evaluate the finite-temperature
one-loop fermionic density in the presence of a chiral background field which
systematically incorporates effects from inhomogeneities in the chiral field
through a derivative expansion. Modifications in the effective potential and
their consequences for the bubble nucleation process are discussed.


title: Total cross sections and soft gluon resummation

abstract:
  We discuss a model for total hadronic and photonic cross-sections which
includes hard parton-parton scattering to drive the rise and soft gluon
resummation to tame it. Unitarity is ensured by embedding the cross-section in
the eikonal formalism. Predictions for LHC and ILC are presented.


title: Crouching Sigma, Hidden Scalar in $\gamma\gamma\to\pi^0\pi^0$

abstract:
  There has long been speculation about the nature of the $\sigma$-resonance.
For three decades Jaffe has argued for a tetraquark composition, while others
have claimed it is largely a glueball. A key pointer to its nature is its
coupling to two photons. Consequently, there have been recent proposals to
observe this important scalar hiding in $\gamma\gamma\to\pi^0\pi^0$. We show
here that the $\sigma$ is already crouching in this cross-section exactly as
measured twenty years ago. What is new is that precise knowledge of the
position of the $\sigma$-pole, provided by the analysis of the Roy equations,
now allows its two photon coupling to be accurately fixed. Its two photon width
is found to be $(4.1 \pm 0.3)$ keV, a value far too large for a gluonic, or
even a tetraquark, state.


title: Neutrino masses and mixing: Leptons versus Quarks

abstract:
  Comparison of properties of quark and leptons as well as understanding their
similarities and differences is one of the milestones on the way to underlying
physics. Several observations, if not accidental, can strongly affect the
implications: (i) nearly tri-bimaximal character of lepton mixing, (ii) special
neutrino symmetries, (iii) the QLC-relations. We consider possible connections
between quarks and leptons which include the quark-lepton symmetry and
unification, approximate universality, and quark-lepton complementarity.
Presence of new neutrino states and their mixing with the left or/and right
handed neutrinos can be the origin of additional differences of quarks and
leptons.


title:
Theoretical expectations for total cross-sections at the large hadron
  collider

abstract:
  In this note, we summarize and compare various model predictions for $pp$
total cross-section $\sigma_{\rm tot}^{pp}$, giving an estimate of the range of
predictions for the total cross-section, $\sigma_{\rm tot}^{pp}$ expected at
the LHC. We concentrate on the results for $\sigma_{\tot}^{pp}$ obtained in a
particular QCD based model of the energy dependence of the total cross-section,
including the effect of soft gluon radiation. We obtain the range of
predictions in this model by exploring the allowed range of model parameters.
We further give a handy parametrisation of these results which incidentally
spans the range of various other available predictions at the LHC as well.


title:
Higher derivatives and brane-localised kinetic terms in gauge theories
  on orbifolds

abstract:
  We perform a detailed analysis of one-loop corrections to the self-energy of
the (off-shell) gauge bosons in six-dimensional N=1 supersymmetric gauge
theories on orbifolds. After discussing the Abelian case in the standard
Feynman diagram approach, we extend the analysis to the non-Abelian case by
employing the method of an orbifold-compatible one-loop effective action for a
classical background gauge field. We find that bulk higher derivative and
brane-localised gauge kinetic terms are required to cancel one-loop divergences
of the gauge boson self energy. After their renormalisation we study the
momentum dependence of both the higher derivative coupling h(k^2) and the {\it
effective} gauge coupling g_eff(k^2). For momenta smaller than the
compactification scales, we obtain the 4D logarithmic running of g_eff(k^2),
with suppressed power-like corrections, while the higher derivative coupling is
constant. We present in detail the threshold corrections to the low energy
gauge coupling, due to the massive bulk modes. At momentum scales above the
compactification scales, the higher derivative operator becomes important and
leads to a power-like running of g_eff(k^2) with respect to the momentum scale.
The coefficient of this running is at all scales equal to the renormalised
coupling of the higher derivative operator which ensures the quantum
consistency of the model. We discuss the relation to the similar one-loop
correction in the heterotic string, to show that the higher derivative
operators are relevant in that case too, since the field theory limit of the
one-loop string correction does not commute with the infrared regularisation of
the (on-shell) string result.


title: An origin for small neutrino masses in the NMSSM

abstract:
  We consider the Next to Minimal Supersymmetric Standard Model (NMSSM) which
provides a natural solution to the so-called mu problem by introducing a new
gauge-singlet superfield S. We realize that a new mechanism of neutrino mass
suppression, based on the R-parity violating bilinear terms mu_i L_i H_u mixing
neutrinos and higgsinos, arises within the NMSSM, offering thus an original
solution to the neutrino mass problem (connected to the solution for the mu
problem). We generate realistic (Majorana) neutrino mass values without
requiring any strong hierarchy amongst the fundamental parameters, in contrast
with the alternative models. In particular, the ratio |mu_i/mu| can reach about
10^-1, unlike in the MSSM where it has to be much smaller than unity. We check
that the obtained parameters also satisfy the collider constraints and internal
consistencies of the NMSSM. The price to pay for this new cancellation-type
mechanism of neutrino mass reduction is a certain fine tuning, which get
significantly improved in some regions of parameter space. Besides, we discuss
the feasibility of our scenario when the R-parity violating bilinear terms have
a common origin with the mu term, namely when those are generated via a VEV of
the S scalar component from the couplings lambda_i S L_i H_u. Finally, we make
comments on some specific phenomenology of the NMSSM in the presence of
R-parity violating bilinear terms.


title: Higgs Boson Mass from Orbifold GUTs with Split Supersymmetry

abstract:
  We consider orbifold GUTs with N=1 supersymmetry in which the Standard Model
(SM) gauge couplings are unified at M_GUT =~ 2 x 10^16 GeV with one of the
third family (charged) Yukawa couplings. With split supersymmetry the SM Higgs
mass is estimated to be 131 +/- 10 GeV for gauge-top quark Yukawa unification,
which increases to 146 +/- 8 GeV for gauge-bottom quark (or gauge-tau lepton)
Yukawa unification.


title: Field Theory on Multi-throat Backgrounds

abstract:
  We consider extra dimensional field theory descriptions of backgrounds with N
different throats where one of the extra dimensions in each throat is much
larger than the others. Such backgrounds can be described by field theory on N
5D warped spaces which intersect on a ultraviolet (UV) brane. Given a field
that propagates in all N throats there are N boundary conditions on the UV
brane (which are determined by the effective Lagrangian on the UV brane) in
addition to the boundary conditions on the N infrared branes. We derive a
general set of UV boundary conditions and give examples of how they are applied
to particular situations. Three simple example applications are given: in the
first the number of families is determined by the number of throats and the
SUSY flavor problem is solved via an S_3 symmetry of the throats; in the second
we embed this scenario in a SUSY GUT with a solution of the doublet-triplet
splitting problem based on the product group approach; while in the final
example we show a simple geometric implementation of a SUSY trinification model
on three throats.


title:
Neutrino Mass Through Concomitant Breakdown of the U(1) Chiral and Scale
  Symmetries

abstract:
  The possibility of generating neutrino mass through see-saw mechanism
involving U(1) chiral Peccei-Quinn and scale symmetries breakdown is discussed.
We consider a generic scale invariant model which has three Majorana fermions
and a complex scalar singlet, which might be the one responsible for an
invisible axion, and we perform a summation of all leading logarithmic
radiative corrections to the tree level potential. The effective potential so
obtained is stable and drives the scalar field to a nonzero vacuum expectation
value according to the Coleman-Weinberg mechanism. As a result, right-handed
neutrinos gain mass at the Peccei-Quinn scale which is suggestive for
explaining very light active neutrinos. We illustrate the whole idea with the
addition of the Standard Model, and also a SU(3)$_L\otimesU(1)_X$ model in
which the subgroup SU(2)$_L\otimesU(1)_Y$ is constrained to be broken as an
effect of the effective potential. This last model presents electric charge
quantization as well.


title: Lepton number violation via intermediate black hole processes

abstract:
  Black holes at the TeV scale are investigated in the extra large dimension
scenario. We interpret the lightest black hole excitation as a singlet scalar
field, and show how interaction terms can be appended to the standard model at
the dimension five non-renormalizable level. Lepton family number violation is
natural in this model. Muon magnetic moment, and neutrino masses are
investigated. We also present a quantization scheme in n dimensions.


title: Properties of proton in diquark model

abstract:
  The properties of the proton has been investigated considering a proton as
diquark-quark system. A model for diquark has been suggested in an analogy with
the quasi-particle in a crystal lattice. The mass of the diquark obtained in
the present model has been found to be in good agreement with other theoretical
predictions. The binding energy of proton, compressibility and excitation
energy for the Roper Resonance have also been estimated in the present model
and are found to be in agreement with the existing theoretical and experimental
findings.


title:
Color Glass Condensates in dense quark matter and quantum Hall states of
  gluons

abstract:
  We apply the effective theory of color glass condensate to the analysis of
gluon states in dense quark matter, in which the saturation region of gluons is
also present. We find that in the region two point function of gluons shows
algebraic long range order. The order is completely the same as the one gluons
show in the dense quark matter, which form quantum Hall states. The order leads
to the vanishing of massless gluon pole. We also find that the saturation
region of gluons extends from small $x$ to even large $x\lesssim 1$ in much
dense quark matter. We point out a universality that the color glass condensate
is a property of hadrons at high energy and of quark matter at high baryon
density.


title:
Constraints on flavor-changing Z' models by B_s mixing, Z' production,
  and B_s -> \mu^+ \mu^-

abstract:
  Certain string-inspired Z' models have non-universal interactions to three
families of fermions and induced tree-level flavor-changing couplings. We use
recent results on B_s-anti-B_s mixing to constrain the size of the
flavor-changing couplings in the b-s sector. In some highly predictive Z'
models, such a constraint on b-s coupling can be translated into the
flavor-diagonal couplings. Based on the Z' production limits at the Tevatron,
we obtain the limit on the leptonic couplings of Z' and then make predictions
for B_s -> \mu^+ \mu^- branching ratios. We conclude that with the present
constraints from B_s mixing and Z' production, the muonic decay of $B_s$ may
not be observed at the Tevatron if the projected integrated luminosity is less
than O(5-10) fb.


title:
Pion Condensation in Baryonic Matter: from Sarma Phase to
  Larkin-Ovchinnikov-Fudde-Ferrell Phase

abstract:
  We investigated two pion condensed phases in the frame of the two flavor
Nambu--Jona-Lasinio model at finite baryon density: the homogeneous and
isotropic Sarma phase and inhomogeneous and anisotropic
Larkin-Ovchinnikov-Fudde-Ferrell(LOFF) phase. At small isospin chemical
potential $\mu_I$, the Sarma state is free from the Sarma instability and
magnetic instability due to the strong coupling and large enough effective
quark mass. At large $\mu_I$, while the Sarma instability can be cured via
fixing baryon density $n_B$ to be nonzero, its magnetic instability implies
that the LOFF state is more favored than the Sarma state. In the intermediate
$\mu_I$ region, the stable ground state is the Sarma state at higher $n_B$ and
LOFF state at lower $n_B$.

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


title: 5-Dimensional Difficulties of Gauge-Higgs Unifications

abstract:
  We consider 5 dimensional gauge theories where the 5th direction is
compactified on the orbifold S^1/Z_2, and where the 5th components of the gauge
bosons play the role of the Standard Model Higgs boson (gauge-Higgs
unification). The gauge symmetry breaking is realized through the appropriate
orbifold boundary conditions and through the Hosotani mechanism. We show that
for {\em any such theory} the assumption that the low-energy vector-boson
spectrum consists of the W^\pm, Z and \gamma only, is inconsistent with the
experimental requirements \sin^2\theta_W\simeq 1/4 and \rho\equiv
m_W^2/(m_Z^2\cos^2\theta_w)=1.


title:
Single spin asymmetries and gauge invariance in hard scattering
  processes

abstract:
  In this PhD-thesis effects from intrinsic transverse momentum are studied in
several hard scattering processes with an emphasis on color gauge invariance.
The thesis is intended for beginning PhD-students as well as for the experts.


title: Equation of State for Neutralino Star as a Form of Cold Dark Matter

abstract:
  In order to study the structure of neutralino star and dark galaxy, we
consider dynamical interactions due to boson-exchange in the neutralino matter.
Taking into account interactions of neutralinos with bosons, we derive the
equation of state (EOS) of neutralino stars in terms of the relativistic mean
field approach. Then we apply the resulting EOS to investigate properties of
the neutralino star such as its density profile and mass limit. For example, if
the neutralino mass is around 1 TeV, the Oppenheimer mass limit of the
neutralino star is obtained as $6.06\times 10^{-7}M_\odot$, and the
corresponding radius is about 7.8 mm. Actually, due to an increasing
annihilation rate as indicated by our calculation, this dense state can never
be realized in practice. Our results also show that the low density neutralino
star may be a possible aggregation of the cold dark matter.


title: Supersymmetry at the PLC

abstract:
  In this talk I will begin with a very brief discussion as to why TeV scale
Supersymmetry forms an important subject of the studies at all the current and
future Colliders. Then, I will give different examples where the Photon Linear
Collider, PLC, will be able to make unique contributions. PlC's most important
role is in the context of Higgs Physics, due to its ability of accurate
determination of $\Gamma_{\gamma \gamma}$ as well as the possibilities it
offers for the determination of the CP property of the Higgs boson and of
possible CP mixing in the Higgs sector. Further, the PLC can provide probes of
SUSY in the regions of the SUSY parameter space, which are either difficult or
inaccessible at the LHC and also in the $e^+e^-$ mode of the International
Linear Collider (ILC).


title: A Beta Beam complex based on the machine upgrades for the LHC

abstract:
  The Beta Beam CERN design is based on the present LHC injection complex and
its physics reach is mainly limited by the maximum rigidity of the SPS. In
fact, some of the scenarios for the machine upgrades of the LHC, particularly
the construction of a fast cycling 1 TeV injector (``Super-SPS''), are very
synergic with the construction of a higher $\gamma$ Beta Beam. At the energies
that can be reached by this machine, we demonstrate that dense calorimeters can
already be used for the detection of $\nu$ at the far location. Even at
moderate masses (40 kton) as the ones imposed by the use of existing
underground halls at Gran Sasso, the CP reach is very large for any value of
$\theta_{13}$ that would provide evidence of $\nu_e$ appearance at T2K or
NO$\nu$A ($\theta_{13}\geq 3^\circ$). Exploitation of matter effects at the
CERN to Gran Sasso distance provides sensitivity to the neutrino mass hierarchy
in significant areas of the $\theta_{13}-\delta$ plane.


title: LHC-ILC synergy

abstract:
  I will begin by making a few general comments on the synergy between the
Large Hadron Collider (LHC) which will go in action in 2007 and the
International Linear Collider (ILC) which is under planning. I will then focus
on the synergy between the LHC and the PLC option at the ILC, which is expected
to be realised in the later stages of the ILC program. In this I will cover the
possible synergy in the Higgs sector (with and without CP violation), in the
determination of the anomalous vector boson couplings and last but not the
least, in the search for extra dimensions and radions.