title: A Scenario for Spontaneous CP Violation in SUSY SO(10)

abstract:
  A scenario is suggested for spontaneous CP violation in non-SUSY and SUSY
SU(10). The idea is to have a scalar potential which generates spontaneously a
phase, at the high scale, in the VEV that gives a mass to the RH neutrinos. The
case of the minimal renormalizable SUSY SO(10) is discussed in detail. The high
scale CP breaking induces a phase in the CKM matrix as well. It is also pointed
out that, in these models, the scales of Baryogenesis, Seesaw, Spontaneous CP
violation and Spontaneous U(1)_QP breaking are all of the same order of
magnitude.


title: Direct Mediation of Meta-Stable Supersymmetry Breaking

abstract:
  The supersymmetric SU(Nc) Yang-Mills theory coupled to Nf matter fields in
the fundamental representation has meta-stable vacua with broken supersymmetry
when Nc < Nf < 3/2 Nc. By gauging the flavor symmetry, this model can be
coupled directly to the standard model. We show that it is possible to make a
slight deformation to the model so that gaugino masses are generated and the
Landau pole problem can be avoided. The deformed model has simple realizations
on intersecting branes in string theory, where various features of the
meta-stable vacua are encoded geometrically as brane configurations.


title: Windows over a New Low Energy Axion

abstract:
  We outline some general features of possible extensions of the Standard Model
that include anomalous U(1) gauge symmetries, a certain number of axions and
their mixings with the CP-odd Higgs sector. As previously shown, after the
mixing one of the axions becomes a physical pseudoscalar (the axi-Higgs) that
can take the role of a modified QCD axion. It can be driven to be very light by
the same non-perturbative effects that are held responsible for the solution of
the strong CP-problem. At the same time the axi-Higgs has a sizeable gauge
interaction, which is not allowed to the Peccei-Quinn axion, possibly
explaining the PVLAS results. We point out that the Wess-Zumino term, typical
of these models, can be both interpreted as an anomaly inflow from higher
dimensional theories (second window) but also as a result of partial decoupling
of an extra Higgs sector (and of a fermion) that leaves behind an effective
anomalous abelian theory (first window) in a broken St\"{u}ckelberg phase. The
possibility that the axi-Higgs can be heavy, of the order of the Higgs mass or
larger, however, can't be excluded. The potentialities for the discovery of
this particle and of anomaly effects in the neutral current sector at the LHC
are briefly discussed in the context of a superstring inspired model (second
window), but with results that remain valid also if any of the two
possibilities is realized in Nature.


title: Axions: Past, Present, and Future

abstract:
  The current status of axion physics is presented. There still exists the
axion window 10^9 GeV < F_a < 10^{12} GeV. The recent CAST solar axion search
experiment on the axion-photon-photon coupling strength has to be improved by a
factor of 100 to reach down to the region of superstring axions. The calculable
theta and m_u=0 cases for strong CP solutions, and axino cosmology in SUSY
extension of axion are also commented.


title: Implications of the HyperCP Data on $B$ and $\tau$ decays

abstract:
  If the HyperCP three events for the decay of $\Sigma^+\to p\mu^+\mu^-$ are
explained by a new pseudoscalar (axial-vector) boson $X_{P(A)}$ with a mass of
214.3 MeV, we study the constraints on the couplings between $X_{P(A)}$ and
fermions from the experimental data in $K$ and $B$ processes. Some implications
of the new particle on flavor changing $B$ and $\tau$ decays are given.
Explicitly, we show that the decay branching ratios of $B_{s}\to\phi
X_{P(A)}\to \phi\mu^{+}\mu^{-}$, $B_{d}\to K_{0}^{*}(1430){P(A)}\to
K_{0}^{*}(1430)\mu^{+}\mu^{-}$ and $\tau\to\mu X_{P(A)}\to\mu\mu^{+}\mu^{-}$
can be as large as $2.7 (2.8)\times 10^{-6}$, $7.4 (7.5)\times 10^{-7}$ and
$1.7 (0.14)\times 10^{-7}$, respectively.


title: Type-II seesaw mass models and baryon asymmetry

abstract:
  We compute and also compare the contributions of canonical and noncanonical
mass terms towards baryon asymmetry by considering type-II seesaw mass models
of neutrinos: Degenerare(3 varieties), Normal hierarchical and Inverted
hierarchical(2 varieties). We have shown that for particular choices of
parameter '$\gamma$'(the so-called discriminator) for different neutrino mass
models, the baryon asymmetry is largely dominated by canonical term. Within
such type-II seesaw scenario, we find normal hierarchical mass model as the
most favourable choice of nature.


title:
Scalar form factor of the nucleon and nucleon--scalar meson coupling
  constant in QCD

abstract:
  Scalar form factor of the nucleon is calculated in the framework of light
cone QCD sum rules, using the most general form of the baryon current. Using
the result on scalar form factor of the nucleon, the nucleon-scalar "sigma" and
"a_0" meson coupling constants are estimated. Our results on these couplings
are in good agreement with the prediction of the external field QCD sum rules
method.


title: B-L-symmetric Baryogenesis with Leptonic Quintessence

abstract:
  We discuss a toy model where baryogenesis and cosmic acceleration are driven
by a leptonic quintessence field coupled to the standard model sector via a
massive mediating scalar field. It does not require the introduction of
B-L-violating interactions below the inflationary scale. Instead, a
B-L-asymmetry is stored in the quintessence field, which compensates for the
corresponding observed baryon asymmetry.


title: Diquark and light four-quark states

abstract:
  Four-quark states with different internal clusters are discussed within the
constituent quark model. It is pointed out that the diquark concept is not
meaningful in the construction of a tetraquark interpolating current in the QCD
sum rule approach, and hence existing sum-rule studies of four-quark states are
incomplete. An updated QCD sum-rule determination of the properties of diquark
clusters is then used as input for the constituent quark model to obtain the
masses of light $0^{++}$ tetraquark states ({\it i.e.\} a bound state of two
diquark clusters). The results support the identification of $\sigma(600)$,
$f_0(980)$ and $a_0(980)$ as the $0^{++}$ light tetraquark states, and seem to
be inconsistent with the tetraquark state interpretation of the new BES
observations of the near-threshold $p\bar p$ enhancements, X(1835) and X(1812),
with the possible exception that X(1576) may be an "exotic" first orbital
excitation of $f_0(980)$ or $a_0(980)$.


title: The $\omega DD$ vertex in a Sum Rule approach

abstract:
  The study of charmonium dissociation in heavy ion collisions is generally
performed in the framework of effective Lagrangians with meson exchange. Some
studies are also developed with the intention of calculate form factors and
coupling constants related with charmed and light mesons. These quantities are
important in the evaluation of charmonium cross sections. In this paper we
present a calculation of the $\omega DD$ vertex that is a possible interaction
vertex in some meson-exchange models spread in the literature. We used the
standard method of QCD Sum Rules in order to obtain the vertex form factor as a
function of the transferred momentum. Our results are compatible with the value
of this vertex form factor (at zero momentum transfer) obtained in the
vector-meson dominance model.


title: Neutrino Beams From Electron Capture at High Gamma

abstract:
  We investigate the potential of a flavor pure high gamma electron capture
electron neutrino beam directed towards a large water cherenkov detector with
500 kt fiducial mass. The energy of the neutrinos is reconstructed by the
position measurement within the detector and superb energy resolution
capabilities could be achieved. We estimate the requirements for such a
scenario to be competitive to a neutrino/anti-neutrino running at a neutrino
factory with less accurate energy resolution. Although the requirements turn
out to be extreme, in principle such a scenario could achieve as good abilities
to resolve correlations and degeneracies in the search for sin^2(2 theta_13)
and delta_CP as a standard neutrino factory experiment.


title: The singular behavior of massive QCD amplitudes

abstract:
  We discuss the structure of infrared singularities in on-shell QCD amplitudes
with massive partons and present a general factorization formula in the limit
of small parton masses. The factorization formula gives rise to an all-order
exponentiation of both, the soft poles in dimensional regularization and the
large collinear logarithms of the parton masses. Moreover, it provides a
universal relation between any on-shell amplitude with massive external partons
and its corresponding massless amplitude. For the form factor of a heavy quark
we present explicit results including the fixed-order expansion up to three
loops in the small mass limit. For general scattering processes we show how our
constructive method applies to the computation of all singularities as well as
the constant (mass-independent) terms of a generic massive n-parton QCD
amplitude up to the next-to-next-to-leading order corrections.


title: To see the exotic Theta^+ baryon from interference

abstract:
  Since all couplings of the exotic $\Theta^+$ baryon to normal hadrons seem to
be small it is hard to reveal it in standard resonance searching. We suggest to
look for the $\Theta^+$ production in interference with a known resonance
yielding the same final state but having a high production rate. The
interference process is linear in the $\Theta^+$ couplings whereas the
non-interference process is quadratic. That gives an obvious gain if the
couplings are small. Moreover, employing the peculiar oscillating nature of the
interference processes one can reduce considerably the parasitic background and
determine the $\Theta^+$ resonance parameters.


title: Thermal Hadron Production by QCD Hawking Radiation

abstract:
  The QCD counterpart of Hawking radiation from black holes leads to thermal
hadron production in high energy collisions, from $e^+e^-$ annihilation to
heavy ion interactions. This hadronic radiation is formed by tunnelling through
the event horizon of colour confinement and is emitted at a universal
temperature $T_H \simeq (\sigma /2 \pi)^{1/2}$, where $\sigma$ denotes the
string tension. Since the event horizon does not allow information transfer,
the radiation is thermal ``at birth''.


title:
Smoothly evolving Supercritical-String Dark Energy relaxes
  Supersymmetric-Dark-Matter Constraints

abstract:
  We show that Supercritical-String-Cosmology (SSC) off-equilibrium and
time-dependent-dilaton effects lead to a smoothly evolving dark energy for the
last 10 billion years in concordance with all presently available astrophysical
data. Such effects dilute by a factor O (10) the supersymmetric dark matter
density (neutralinos), relaxing severe WMAP 1,3 constraints on the SUSY
parameter space. Thus, LHC anticipated searches/discoveries may discriminate
between conventional and Supercritical-String Cosmology.


title: Diffraction at HERA, the Tevatron and the LHC

abstract:
  In these lectures, we present and discuss the most recent results on
inclusive diffraction from the HERA and Tevatron colliders and give the
prospects for the future at the LHC. Of special interest is the exclusive
production of Higgs boson and heavy objects ($W$, top, stop pairs) which will
require a better understanding of diffractive events and the link between $ep$
and hadronic colliders, as well as precise measurements and analyses of
inclusive diffraction at the LHC in particular to constrain further the gluon
density in the pomeron.


title: |V_us| and m_s from hadronic tau decays

abstract:
  Recent progress in the determination of |V_us| employing strange hadronic
tau-decay data are reported. This includes using the recent OPAL update of the
strange spectral function, as well as augmenting the dimension-two perturbative
contribution with the recently calculated order alpha_s^3 term on the theory
side. These updates result in |V_us| = 0.2220 +- 0.0033, with the uncertainty
presently being dominated by experiment, and already being competitive with the
standard extraction from K_e3 decays and other new proposals to determine
|V_us|. In view of the ongoing work to analyse tau-decay data at the
B-factories BaBar and Belle, as well as future results from BESIII, the error
on |V_us| from tau decays is expected to be much reduced in the near future.


title: Status of heavy quark physics from the lattice

abstract:
  In this short review, I present a summary of various methods used to simulate
heavy quarks on the lattice. I mainly focus on effectives theories, and give
some physical results.


title: Extracting short distance information from b -> s l+ l- effectively

abstract:
  We point out that in inclusive B -> Xs l+ l- decay an angular decomposition
provides a third (q^2 dependent) observable sensitive to a different
combination of Wilson coefficients than the rate and the forward-backward
asymmetry. Since a precise measurement of q^2 dependence requires large data
sets, it is important to consider the data integrated over regions of q^2. We
develop a strategy to extract all measurable Wilson coefficients in B -> Xs l+
l- from a few simple integrated rates in the low q^2 region. A similar
decomposition in B -> K* l+ l-, together with the B -> K* \gamma rate, also
provides a determination of the Wilson coefficients, without reliance on form
factor models and without having to measure the zero of the forward-backward
asymmetry.


title:
Exotic Collider Signals from the Complete Phase Diagram of Minimal
  Universal Extra Dimensions

abstract:
  Minimal universal extra dimensions (mUED) is often thought to predict that
the lightest Kaluza-Klein particle (LKP) is the Kaluza-Klein gauge boson B^1,
leading to conventional missing energy signals at colliders and WIMP dark
matter. In fact, the implications of mUED are far richer: the B^1, charged
Higgs boson H^{\pm 1}, and graviton G^1 are all possible LKPs, leading to many
different ``phases'' with distinct signatures. Considering the complete phase
diagram, we find predictions for charged or neutral particles with decay
lengths of microns to tens of meters; WIMP, superWIMP, or charged relic
particles; metastable particles with lifetimes of the order of or in excess of
the age of the universe; and scenarios combining two or more of these
phenomena. In the cosmologically preferred region, the Higgs boson mass is
between 180 and 245 GeV, the LKP mass is between 810 and 1400 GeV, and the
maximal splitting between first Kaluza-Klein modes is less than 320 GeV. This
region predicts a variety of exotic collider signals, such as slow charged
particles, displaced vertices, tracks with non-vanishing impact parameters,
track kinks, and even vanishing charged tracks, all of which provide early
discovery possibilities at the Large Hadron Collider.


title: Physics with a very long neutrino factory baseline

abstract:
  We discuss the neutrino oscillation physics of a very long neutrino factory
baseline over a broad range of lengths (between 6000 km and 9000 km), centered
on the ``magic baseline'' ($\sim$ 7500 km) where correlations with the leptonic
CP phase are suppressed by matter effects. Since the magic baseline depends
only on the density, we study the impact of matter density profile effects and
density uncertainties over this range, and the impact of detector locations off
the optimal baseline. We find that the optimal constant density describing the
physics over this entire baseline range is about 5% higher than the average
matter density. This implies that the magic baseline is significantly shorter
than previously inferred. However, while a single detector optimization
requires fine-tuning of the (very long) baseline length, its combination with a
near detector at a shorter baseline is much less sensitive to the far detector
location and to uncertainties in the matter density. In addition, we point out
different applications of this baseline which go beyond its excellent
correlation and degeneracy resolution potential. We demonstrate that such a
long baseline assists in the improvement of the $\theta_{13}$ precision and in
the resolution of the octant degeneracy. Moreover, we show that the neutrino
data from such a baseline could be used to extract the matter density along the
profile up to 0.24% at $1 \sigma$ for large $\sin^2 2 \theta_{13}$, providing a
useful discriminator between different geophysical models.


title: Properties and signatures of supersymmetric Q-balls

abstract:
  Supersymmetric extensions of the Standard Model predict the existence of
Q-balls with baryon and lepton numbers. Stable Q-balls can form at the end of
inflation from the fragmentation of the Affleck-Dine condensate and can exist
as dark matter. The best current limits come from Super-Kamiokande and MACRO.
The search beyond these limits can be conducted using the future water
Cherenkov detectors.


title:
Study of meson properties in quark models (Ph.D. Thesis, University of
  Pittsburgh, October 2006)

abstract:
  The main motivation is to investigate meson properties in the quark model to
understand the model applicability and generate possible improvements. Certain
modifications to the model are suggested which have been inspired by
fundamental QCD properties (such as running coupling or spin dependence of
strong interactions). These modifications expand the limits of applicability of
the constituent quark model and illustrate its weaknesses and strengths. The
meson properties studied include meson spectra, decay constants,
electromagnetic and electroweak form-factors and radiative transitions. The
results are compared to the experimental data, lattice gauge theory
calculations and other approaches. Modifications to the quark model suggested
in this dissertation lead to a very good agreement with available experimental
data and lattice results.


title: Interactions of Coloured Heavy Stable Particles in Matter

abstract:
  In this paper we present a physics model for the interactions of stable heavy
hadrons containing a heavy parton with matter. The model presented is a natural
continuation of the work started in hep-ex/0404001. However, changes and
generalisations have been made allowing for the description of a broader scope
of physics scenarios. As a special case the model is tested on the cases of
stable gluino and stop hadrons, thus covering both stable colour triplet and
octet states. Conclusions are drawn regarding the phenomenology of these cases
including how to distinguish between them.


title: On the 'toy model" in the Reggeon field theory

abstract:
  The Reggeon field theory with zero transverse dimensions is studied in the
Hamiltonian formulation for both sub-and supercritical pomeron. Mathematical
aspects of the model, in particular the scalar products in the space of quantum
states, are discussed. Relation to reaction-diffusion processes is derived in
absence of pomeron merging. Numerical calculations for different parameters of
the models, $\alpha(0)-1=\mu$ and the triple pomeron coupling constant
$\lambda$, show that the triple pomeron interaction always makes amplitudes
fall with rapidity irrespective of the value of the intercept. The smaller the
values of the ratio $\lambda/\mu$ the higher are rapidities $y$ at which this
fall starts, so that at small values of $\lambda$ it begins at asymptotically
high rapidities (for $\lambda/\mu<1/4$ the fall is noticeable only at $\mu
y>100$). No visible singularity is seen for the critical pomeron. A
perturbative treatment is proposed which may be useful for more realistic
models.


title:
Electromagnetic form factors of the nucleon in spacelike and timelike
  regions

abstract:
  An approach for a unified description of the nucleon electromagnetic form
factors in spacelike and timelike regions is presented. The main ingredients of
our model are: $i)$ a Mandelstam formula for the matrix elements of the nucleon
electromagnetic current; $ii)$ a 3-dimensional reduction of the problem on the
Light-Front performed within the so-called {\tt Propagator Pole Approximation}
({\bf PPA}), which consists in disregarding the analytical structure of the
Bethe-Salpeter amplitudes and of the quark-photon vertex function in the
integration over the minus components of the quark momenta; $iii)$ a dressed
photon vertex in the $q\bar{q}$ channel, where the photon is described by its
spin-1, hadronic component.


title: Chiral expansion of the nucleon mass to order q^6

abstract:
  We present the results of a complete two-loop calculation at order q^6 of the
nucleon mass in manifestly Lorentz-invariant chiral perturbation theory. The
renormalization is performed using the reformulated infrared renormalization,
which allows for the treatment of two-loop integrals while preserving all
relevant symmetries, in particular chiral symmetry.


title:
Pinning down the mechanism of neutrinoless double beta decay with
  measurements in different nuclei

abstract:
  A measurement of neutrinoless double beta decay in one isotope does not allow
to determine the underlying physics mechanism. We discuss the discrimination of
mechanisms for neutrinoless double beta decay by comparing ratios of half life
measurements for different isotopes. Six prominent examples for specific new
physics contributions to neutrinoless double beta decay are analyzed. We find
that the change in corresponding ratios of half lives varies from 60% for
supersymmetric models up to a factor of 5-20 for extra-dimensional and
left-right-symmetric mechanisms.


title: Huge right-handed current effects in B->K*(K pi)l+l- in supersymmetry

abstract:
  Transverse asymmetries in the decay B->K*(K pi)l+l- are an extremely
sensitive probe of right-handed flavour-changing neutral currents. We show how
to include the contribution from the chiral partner of the electromagnetic
operator on the transverse asymmetries at NLO in QCD factorization. We then
consider supersymmetric models with non-minimal flavour violation in the
down-squark sector. We include all the relevant experimental constraints and
present a numerical formula for B->Xs gamma that takes into account the most
recent NNLO calculations. We show that the flavour-changing parameters of these
models are poorly constrained by present data and allow for large effects on
the transverse asymmetries that we consider.


title: Theoretical update of Bs-Bs-bar mixing

abstract:
  We update the theory predictions for the mass difference $\dm_s$, the width
difference $\dg_s$ and the CP asymmetry in flavour-specific decays, $a_{\rm
fs}^{s}$, for the \bbs system. In particular we present a new expression for
the element $\Gamma_{12}^s$ of the decay matrix, which enters the predictions
of $\dg_s$ and $a_{\rm fs}^{s}$. To this end we introduce a new operator basis,
which reduces the troublesome sizes of the $1/m_b$ and $\alpha_s$ corrections
and diminishes the hadronic uncertainty in $\dg_s/\dm_s$ considerably.
Logarithms of the charm quark mass are summed to all orders. We find
$\dg_s/\dm_s= (49.7 \pm 9.4) \cdot 10^{-4}$ and $\dg_s =(f_{B_s}/240 {\rm
MeV})^2 [(0.105 \pm 0.016) B + (0.024 \pm 0.004) \tilde{B}_S' - 0.027 \pm
0.015] {ps}^{-1}$ in terms of the bag parameters $B$, $\tilde{B}_S'$ in the NDR
scheme and the decay constant $f_{B_s}$. The improved result for
$\Gamma_{12}^s$ also permits the extraction of the CP-violating \bbms phase
from $a_{\rm fs}^{s}$ with better accuracy. We show how the measurements of
$\Delta M_s$, $\Delta\Gamma_s$, $a_{\rm fs}^{s}$, $A_{\rm CP}^{\rm mix}(B_s\to
J/\psi \phi)$ and other observables can be efficiently combined to constrain
new physics. Applying our new formulae to data from the D{\O}experiment, we
find a 2$\sigma$ deviation of the \bbms phase from its Standard Model value. We
also briefly update the theory predictions for the \bbd system and find
$\dg_d/\dm_d = \lt(52.6 \epm{11.5}{12.8} \rt) \cdot 10^{-4}$ and $a_{\rm fs}^d
= \lt(-4.8\epm{1.0}{1.2} \rt) \cdot 10^{-4}$ in the Standard Model.


title: Wilson loops in heavy ion collisions and their calculation in AdS/CFT

abstract:
  Expectation values of Wilson loops define the nonperturbative properties of
the hot medium produced in heavy ion collisions that arise in the analysis of
both radiative parton energy loss and quarkonium suppression. We use the
AdS/CFT correspondence to calculate the expectation values of such Wilson loops
in the strongly coupled plasma of N=4 super Yang-Mills (SYM) theory, allowing
for the possibility that the plasma may be moving with some collective flow
velocity as is the case in heavy ion collisions. We obtain the N=4 SYM values
of the jet quenching parameter $\hat q$, which describes the energy loss of a
hard parton in QCD, and of the velocity-dependence of the quark-antiquark
screening length for a moving dipole as a function of the angle between its
velocity and its orientation. We show that if the quark-gluon plasma is flowing
with velocity v_f at an angle theta with respect to the trajectory of a hard
parton, the jet quenching parameter $\hat q$ is modified by a factor
gamma_f(1-v_f cos theta), and show that this result applies in QCD as in N=4
SYM. We discuss the relevance of the lessons we are learning from all these
calculations to heavy ion collisions at RHIC and at the LHC. Furthermore, we
discuss the relation between our results and those obtained in other theories
with gravity duals, showing in particular that the ratio between $\hat q$ in
any two conformal theories with gravity duals is the square root of the ratio
of their central charges. This leads us to conjecture that in nonconformal
theories $\hat q$ defines a quantity that always decreases along
renormalization group trajectories and allows us to use our calculation of
$\hat q$ in N=4 SYM to make a conjecture for its value in QCD.


title:
Systematic Parameter Space Search of Extended Quark-Lepton
  Complementarity

abstract:
  We systematically investigate the parameter space of neutrino and charged
lepton mass matrices for textures motivated by an extended quark-lepton
complementarity. As the basic hypothesis, we postulate that all mixing angles
in U_l and U_nu be either maximal or described by powers of a single small
quantity epsilon ~ theta_C. All mass hierarchies are described by this epsilon
as well. In this study, we do not assume specific forms for U_l and U_nu, such
as large mixing coming from the neutrino sector only. We perform a systematic
scan of the 262,144 generated mixing matrices for being compatible with current
experimental data, and find a sample of 2,468 possibilities. We then analyze
and classify the effective charged lepton and neutrino mass textures, where we
especially focus on a subset of models getting under pressure for small
theta_13. In addition, we predict the mixing angle distributions from our
sample of all valid textures, and study the robustness of this prediction. We
also demonstrate how our procedure can be extended to predictions of the Dirac
and Majorana phases in U_PMNS. For instance, we find that CP conservation in
neutrino oscillations is preferred, and we can impose a lower bound on the
mixing matrix element for neutrinoless double beta decay.


title: Cherenkov gluons at RHIC and LHC

abstract:
  The coherent hadron production analogous to Cherenkov radiation of photons
gives rise to the ring-like events. Being projected on the ring diameter they
produce the two-bump structure recently observed for the away-side jets at
RHIC. The position of the peaks and their height determine such properties of
the hadronic medium as its nuclear index of refraction, the parton density, the
free path length and the energy loss of Cherenkov gluons. Beside comparatively
low energy gluons observed at RHIC, there could be high energy gluons at LHC,
related to the high energy region of positive real part of the forward
scattering amplitude and possessing different characteristics.


title:
Potentially large top quark electric dipole moment from an anomalous tbW
  coupling

abstract:
  This paper has been withdrawn and merged with hep-ph/0611379 for publication
in Physical Review D


title: Tevatron-for-LHC Report: Higgs

abstract:
  The search for Higgs bosons in both the standard model and its extensions is
well under way at the Tevatron. As the integrated luminosity collected
increases into the multiple inverse femptobarn range, these searches are
becoming very interesting indeed. Meanwhile, the construction of the Large
Hadron Collider (LHC) and its associated experiments at CERN are nearing
completion. In this TeV4LHC workshop, it was realized that any experience at
the Tevatron with respect to backgrounds, experimental techniques and
theoretical calculations that can be verified at the Tevatron which have
relevance for future measurements at the LHC were important. Studies and
contributions to these efforts were made in three broad categories: theoretical
calculations of Higgs production and decay mechanisms; theoretical calculations
and discussions pertaining to non-standard model Higgs bosons; and experimental
reviews, analyses and developments at both the Tevatron and the upcoming LHC
experiments. All of these contributions represent real progress towards the
elucidation of the mechanism of electroweak symmetry breaking.


title: Hunting eta_b through radiative decay into J/psi

abstract:
  We propose that the radiative decay process, \eta_b\to J/\psi\gamma, may
serve as a clean searching mode for \eta_b in hadron collision facilities. By a
perturbative QCD calculation, we estimate the corresponding branching ratio to
be of order 10^{-7}. Though very suppressed, this radiative decay channel in
fact has larger branching ratio than the hadronic decay process \eta_b\to
J/\psi J/\psi, which was previously hoped to be a viable mode for ferreting out
\eta_b in Tevatron Run 2. The discovery potential of \eta_b through this
channel seems promising in the forthcoming LHC experiments and maybe even in
Tevatron Run 2, thanks to the huge statistics of \eta_b to be accumulated in
these experiments. The same calculational scheme is also used to estimate the
branching ratios for the processes \eta_b (\eta_c) \to \phi\gamma.


title: Polarized Gluon Distribution Delta g(x) in the Proton

abstract:
  We study the polarized gluon distribution $\Delta g(x)$ in a longitudinally
polarized proton. We argue that the distribution can be calculated
approximately from the quark color currents found in simple quark models. The
first result from the MIT bag model as well as the non-relativistic quark model
shows that $\Delta g(x)$ is positive at all $x$. If this feature holds in QCD,
it imposes a strong constraint on phenomenological fits to experimental data.
The total gluon helicity $\Delta G$ from the bag model is about $0.3\hbar$ at
the scale of 1 GeV, considerably smaller than previous theoretical
expectations.


title: Enhanced Pomeron diagrams: re-summation of unitarity cuts

abstract:
  Unitarity cuts of enhanced Pomeron diagrams are analyzed in the framework of
the Reggeon Field Theory. Assuming the validity of the
Abramovskii-Gribov-Kancheli cutting rules, we derive a complete set of cut
non-loop enhanced graphs and observe important cancellations between certain
sub-classes of the latter. We demonstrate also how the present method can be
generalized to take into consideration Pomeron loop contributions.


title: Lifetimes and oscillations of heavy mesons

abstract:
  We review the theoretical status of the lifetime ratios $\tau_{B^+} /
\tau_{B_d}$ and $\tau_{B_s} / \tau_{B_d}$ and of the mixing quantities $\Delta
M_s$, $\Delta \Gamma_s$ and $\phi_s$. We show that the ratio $\Delta \Gamma_s /
\Delta M_s$ can be determined with almost no non-perturbative uncertainties.
Finally we explain how this precise determination of the standard model values
can be used to find possible new physics contributions in $\Delta M_s $,
$\Delta \Gamma_s$, $\Delta \Gamma_s / \Delta M_s$ and $a_{fs}^s$. Combining the
latest experimental bounds on these quantities one already gets some hints for
new physics contributions.


title: Charge asymmetry for electron (positron)-proton elastic scattering

abstract:
  Charge asymmetry in electron (positron) scattering arises from the
interference of the Born amplitude and the box-type amplitude corresponding to
two virtual photons exchange. It can be extracted from electron proton and
positron proton scattering experiments, in the same kinematical conditions.
Considering the virtual photon Compton scattering tensor, which contributes to
the box-type amplitude, we separate proton and inelastic contributions in the
intermediate state and parametrize the proton form-factors as the sum of a pure
QED term and a strong interaction term. Arguments, based on analyticity, are
given in favor of cancellation of contributions from proton strong interaction
form factors and of inelastic intermediate states in the box type amplitudes.
In frame of this model, and assuming a dipole character of form-factors,
numerical estimations are given for moderately high energies.


title: Numerical Evaluation of some Parameters for a Model of Neutral Kaons

abstract:
  Using the Mathematica program we calculate numerically the difference of the
diagonal matrix elements of the time dependent effective Hamiltonian for the
neutral K meson complex. We consider the exactly solvable neutral K meson model
based on the one-pole approximation for the mass density. The so-called
Khalfin's Theorem is numerically examined. Some characteristic parameters for
this system are also calculated. The results of all calculations are presented
in the graphical form. The calculations are made assuming the total system is
CPT -- invariant and CP -- noninvariant.


title: Dynamically Generated Open and Hidden Charm Meson Systems

abstract:
  We will study open and hidden charm scalar meson resonances within two
different models. The first one is a direct application of a chiral Lagrangian
already used to study flavor symmetry breaking in Skyrme models. In another
approach to the problem a SU(4) symmetric Lagrangian is built and the symmetry
is broken down to SU(3) by identifying currents where heavy mesons are
exchanged and suppressing those. Unitarization in couple channels leads to
dynamical generation of resonances in both models, in particular a new hidden
charm resonance with mass 3.7 GeV is predicted. The small differences between
these models and with previous works will be discussed.


title: Warped/Composite Phenomenology Simplified

abstract:
  This is the first of two papers aimed at economically capturing the collider
phenomenology of warped extra dimensions with bulk Standard Model fields, where
the hierarchy problem is solved non-supersymmetrically. This scenario is
related via the AdS/CFT correspondence to that of partial compositeness of the
Standard Model. We present a purely four-dimensional, two-sector effective
field theory describing the Standard Model fields and just their first
Kaluza-Klein/composite excitations. This truncation, while losing some of the
explanatory power and precision of the full higher-dimensional warped theory,
greatly simplifies phenomenological considerations and computations. We
describe the philosophy and explicit construction of our two-sector model, and
also derive formulas for residual Higgs fine tuning and electroweak and flavor
precision variables to help identify the most motivated parts of the parameter
space. We highlight several of the most promising channels for LHC exploration.
The present paper focusses on the most minimal scenario, while the companion
paper addresses the even richer phenomenology of the minimal scenario of
precision gauge coupling unification.


title: Goldstone boson currents in a kaon condensed CFL phase

abstract:
  We study the stability of the kaon condensed color-flavor locked (CFL) phase
of dense quark matter with regard to the formation of a non-zero Goldstone
boson current. In the kaon condensed phase there is an electrically charged
fermion which becomes gapless near \mu_s^(1) \simeq 1.35\Delta and a neutral
fermion which becomes gapless near \mu_s^(2)\simeq 1.61\Delta. Here,
\mu_s=m_s^2/(2p_F) is the shift in the Fermi energy due to the strange quark
mass m_s and \Delta is the gap in the chiral limit. The transition to the
gapless phase is continuous at \mu_s^(1) and first order at \mu_s^(2). We find
that the magnetic screening masses are real in the regime \mu_s< \mu_s^(2), but
some screening masses are imaginary for \mu_s> \mu_s^(2). We show that there is
a very weak current instability for \mu_s>\mu_s^(1) and a more robust
instability in a small window near \mu_s^(2). We also show that in the
Goldstone boson current phase all components of the magnetic screening mass are
real. There is a range of values of \mu_s below 2\Delta in which the magnetic
gluon screening masses are imaginary but the phase is stable with respect to
electrically neutral fluctuations of the gauge field.


title: Lightest sterile neutrino abundance within the nuMSM

abstract:
  We determine the abundance of the lightest (dark matter) sterile neutrinos
created in the Early Universe due to active-sterile neutrino transitions from
the thermal plasma. Our starting point is the field-theoretic formula for the
sterile neutrino production rate, derived in our previous work [JHEP
06(2006)053], which allows to systematically incorporate all relevant effects,
and also to analyse various hadronic uncertainties. Our numerical results
differ moderately from previous computations in the literature, and lead to an
absolute upper bound on the mixing angles of the dark matter sterile neutrino.
Comparing this bound with existing astrophysical X-ray constraints, we find
that the Dodelson-Widrow scenario, which proposes sterile neutrinos generated
by active-sterile neutrino transitions to be the sole source of dark matter, is
only possible for sterile neutrino masses lighter than 3.5 keV (6 keV if all
hadronic uncertainties are pushed in one direction and the most stringent X-ray
bounds are relaxed by a factor of two). This upper bound may conflict with a
lower bound from structure formation, but a definitive conclusion necessitates
numerical simulations with the non-equilibrium momentum distribution function
that we derive. If other production mechanisms are also operative, no upper
bound on the sterile neutrino mass can be established.


title:
Off mass shell effects in associated production of the top quark pair
  and Higgs boson at a linear collider

abstract:
  We discuss effects related to the fact that the final state particles of a
reaction e+ e- -> t \bar{t} H are actually produced and they decay off mass
shell. For the intermediate mass Higgs boson, which decays preferably into a
b\bar{b}-quark pair, the reaction will be observed through reactions with 8
fermions in the final state. Such reactions, already in the lowest order of the
standard model, receive contributions typically from a few dozen thousands of
the Feynman diagrams, the vast majority of which constitute background to the
signal of associated production of the top quark pair and Higgs boson. In order
to illustrate pure off mass shell effects we neglect the background
contributions and compare the `signal' cross section with the cross section in
the narrow width approximation for e+ e- -> b u \bar{d} \bar{b} mu- \bar{nu}_mu
b \bar{b}, which is one of possible detection channels of the associated
production of the top quark pair and Higgs boson at a linear collider.


title: Two-loop virtual top-quark effect on Higgs-boson decay to bottom quarks

abstract:
  In most of the mass range encompassed by the limits from the direct search
and the electroweak precision tests, the Higgs boson of the standard model
preferably decays to bottom quarks. We present, in analytic form, the dominant
two-loop electroweak correction, of O(G_F^2 m_t^4), to the partial width of
this decay. It amplifies the familiar enhancement due to the O(G_F m_t^2)
one-loop correction by about +16% and thus more than compensates the screening
by about -8% through strong-interaction effects of order O(alpha_s G_F m_t^2).


title:
Threshold effects near the compactification scale for gauge couplings on
  orbifolds

abstract:
  In 6D orbifold compactifications of N=1 supersymmetric gauge theories, the
one-loop behaviour of the 4D {\it effective} gauge coupling and of its beta
function are carefully investigated for momentum scales k^2 near the
compactification scale(s). It is showed that as k^2 is crossing the
compactification scale(s), there exists a smooth transition ("crossover") to a
power-like behaviour of the 4D effective coupling, with a continuous one-loop
beta function. Contrary to the naive expectation, the power-like behaviour sets
in at momentum scales {\it smaller} than the compactification scale, to suggest
a {\it global} effect of the Kaluza-Klein modes even below this scale. We argue
that the experimental observation of such behaviour is not necessarily a
quantum effect of the compactification, as often thought, and is dominated by
classical effects. Special attention is paid to convergence issues near
compactification scale(s) and to the scheme dependence of the results.


title: Gauge Mediation Simplified

abstract:
  Gauge mediation of supersymmetry breaking is drastically simplified using
generic superpotentials without U(1)_R symmetry by allowing metastable vacua.


title: The importance of N2 leptogenesis

abstract:
  We argue that fast interactions of the lightest singlet neutrino $N_1$ would
project part of a preexisting lepton asymmetry $L_p$ onto a direction that is
protected from $N_1$ washout effects, thus preventing it from being erased. In
particular, we consider an asymmetry generated in $N_2$ decays, assuming that
$N_1$ interactions are fast enough to bring $N_1$ into full thermal
equilibrium. If $N_1$ decays occur at $T\gsim 10^9$ GeV, that is, before the
muon Yukawa interactions enter into thermal equilibrium, then generically part
of $L_p$ survives. In this case some of the constraints implied by the standard
$N_1$ leptogenesis scenario hold only if $L_p \approx 0$. For $T\lsim 10^9$
GeV, $L_p$ is generally erased, unless special alignment/orthogonality
conditions in flavor space are realized.


title:
Radiative Yukawa Couplings for Supersymmetric Higgs Singlets at Large
  tan(beta)

abstract:
  Singlet Higgs bosons present in extensions of the MSSM can have sizable
Yukawa couplings to the b quark and the tau lepton for large values of
tan(beta) at the 1-loop level. We present an effective Lagrangian which
incorporates these tan(beta)-enhanced Yukawa couplings and which enables us to
study their effect on singlet Higgs-boson phenomenology within the context of
both the mnSSM and the NMSSM. In particular, we find that the loop-induced
coupling can be a significant effect for the singlet pseudoscalar, and may
dominate its decay modes. Further implications of the tan(beta)-enhanced Yukawa
couplings for the phenomenology of the singlet Higgs bosons are briefly
discussed.


title: Emergent Relativity: Neutrinos as Probe of the Underlying Theory

abstract:
  Neutrinos allow for a test of the hypothesis that the fermions of the
Standard Model have Fermi-point splitting, analogous to the fermionic
quasi-particles of certain condensed-matter systems. If present, the
corresponding Lorentz-violating terms in the Hamiltonian may provide a new
source of T and CP violation in the leptonic sector, which is not directly
related to mass.


title: |V_{ub}| from B-> pi e nu

abstract:
  I discuss the results for $|V_{ub}|$ obtained from $B\to\pi e \nu$ using the
form factor $f_+(q^2)$ from QCD sum rules on the light-cone and unquenched
lattice calculations; the shape of $f_+(q^2)$ is fixed from experimental data.


title: Fuzzy Bags and Wilson Lines

abstract:
  I start with an elementary observation about the pressure in the deconfined
phase of a SU(3) gauge theory without quarks. This suggests a ``fuzzy'' bag
model for the analogous pressure in QCD, with dynamical quarks. I then sketch
how the deconfined phase might be described using an effective theory of Wilson
lines. To leading order in weak coupling, the effective electric field appears
in a form familiar from the lattice theory of Banks and Ukawa.


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

abstract:
  Here we give our reply to the comment by Sibirtsev et al on our paper ``Mass
and K-Lambda Coupling of the N*(1535)".


title: Probing Models of Quantum Decoherence in Particle Physics and Cosmology

abstract:
  In this review we first discuss the string theoretical motivations for
induced decoherence and deviations from ordinary quantum-mechanical behaviour;
this leads to intrinsic CPT violation in the context of an extended class of
quantum-gravity models. We then proceed to a description ofprecision tests of
CPT symmetry and quantum mechanics using mainly neutral kaons and neutrinos. We
also emphasize the possibly unique role of neutral meson factories in providing
specific tests of models where the quantum-mechanical CPT operator is not
well-defined, leading to modifications of Einstein-Podolsky-Rosen particle
correlators. Finally, we discuss experimental probes of decoherence in a
cosmological context, including studies of dissipative relaxation models of
dark energy in the context of non-critical (non-equilibrium) string theory and
the associated modifications of the Boltzmann equation for the evolution of
species abundances.


title: Stability and leptogenesis in the left-right symmetric seesaw mechanism

abstract:
  We analyze the left-right symmetric type I+II seesaw mechanism, where an
eight-fold degeneracy among the mass matrices of heavy right-handed neutrinos
M_R is known to exist. Using the stability property of the solutions and their
ability to lead to successful baryogenesis via leptogenesis as additional
criteria, we discriminate among these eight solutions and partially lift their
eight-fold degeneracy. In particular, we find that viable leptogenesis is
generically possible for four out of the eight solutions.


title: SUSY at the Pole

abstract:
  We study the role neutrino telescopes could play in discovering
supersymmetric extensions of the Standard Model with a long-lived stau
next-to-lightest superparticle. In such a setup, pairs of staus are produced by
cosmic neutrino interactions in the Earth matter. In optimistic scenarios, one
can expect several pair events per year in a cubic kilometer detector such as
IceCube. We also show that no significant event rate can be expected for decays
of staus stopped in the detector.


title: Transverse-momentum dependent functions in semi-inclusive DIS

abstract:
  The cross section for semi-inclusive deep inelastic scattering can be
decomposed in terms of 18 structure functions. At low transverse momentum of
the detected hadron, the structure functions can be expressed in terms of
transverse-momentum-dependent parton distribution and fragmentation functions.
Here, a few selected examples are illustrated and discussed.


title: Sudakov-Logarithmen in der elektroschwachen Wechselwirkung

abstract:
  Experiments at the future colliders LHC and ILC will, for the first time,
explore electroweak reactions at energies in the TeV region, i.e. far beyond
the masses of the W and Z bosons. In exclusive processes without the emission
of massive gauge bosons double-logarithmic contributions, so-called Sudakov
logarithms, will then become relevant. Precise theoretical predictions require
the knowledge of the complete logarithmic two-loop corrections in the high
energy limit, thus exceeding the approximation through the leading powers of
logarithms known so far. This PhD thesis is focussed on the calculation of
analytic two-loop corrections to the form factor of an Abelian vector current.
It also studies with the help of evolution equations the consequences of these
results for electroweak cross sections of four-fermion processes. Contributions
from the Higgs boson and the mass difference between the W and the Z boson are
considered as well, and the factorization of the singular contributions from
the massless photon is demonstrated. The results represent theoretical two-loop
predictions for four-fermion processes in the accuracy needed for the precision
experiments at the ILC.


title:
Associated charged Higgs and W boson production in the MSSM at the CERN
  Large Hadron Collider

abstract:
  We investigate the viability of observing charged Higgs bosons (H^+/-)
produced in association with W bosons at the CERN Large Hadron Collider, using
the leptonic decay H^+ -> tau^+ nu_tau and hadronic W-decay, within different
scenarios of the Minimal Supersymmetric Standard Model (MSSM) with both real
and complex parameters. Performing a parton level study we show how the
irreducible Standard Model background from W+2 jets can be controlled by
applying appropriate cuts and find that the size of a possible signal depends
on the cuts needed to suppress QCD backgrounds and misidentifications. In the
standard maximal mixing scenario of the MSSM we find a viable signal for large
tan(beta) and intermediate H^+/- masses (~m_t) when using optimistic cuts
whereas for more pessimistic ones we only find a viable signal for very large
tan(beta) (>~50). We have also investigated a special class of MSSM scenarios
with large mass-splittings among the heavy Higgs bosons where the cross-section
can be resonantly enhanced by factors up to one hundred, with a strong
dependence on the CP-violating phases. Even so we find that the signal after
cuts remains small except for small masses (~< m_t) with optimistic cuts.
Finally, in all the scenarios we have investigated we have only found small
CP-asymmetries.


title: Higher Order Thermal Corrections to Photon Self Energy

abstract:
  We investigate temperature behavior up to two loop level in QED in the
background heat bath using real time formalism. The thermal correction to the
coupling constant in QED at low temperature are presented up to the two loop
level. It is observed that the removal of singularities at the two loop level
is only possible if the integrations of loop momenta are done in a specific
order. Some of the possible applications of the results are also indicated.


title: Model for light scalars in QCD

abstract:
  We propose a systematic procedure to study a generalized linear sigma model
which can give a physical picture of possible mixing between $q{\bar q}$ and
$qq{\bar q}{\bar q}$ low lying spin zero states. In the limit of zero quark
masses, we derive the model independent results for the properties of the Nambu
Goldstone pseudoscalar particles. For getting information on the scalars it is
necessary to make a specific choice of terms. We impose two plausible physical
criteria - the modeling of the axial anomaly and the suppression of effective
vertices representing too many fermion lines - for limiting the large number of
terms which are allowed on general grounds. We calculate the tree-level
spectrum based on the leading terms in our approach and find that it
prominently exhibits a very low mass isosinglet scalar state. Finally we point
out that the low energy result for scattering of pions continues to hold in the
general version of the model.


title: Quaero@H1: An Interface to High-pT HERA Event Data

abstract:
  Distributions from high-pT HERA event data analyzed in a general search for
new physics at H1 have been incorporated into Quaero, an algorithm designed to
automate tests of specific hypotheses with high energy collider data. The use
of Quaero@H1 to search for leptoquarks, R-parity violating supersymmetry, and
excited quarks provides examples to develop intuition for the algorithm's
performance.


title: Breakdown of QCD coherence ?

abstract:
  We reconsider the calculation of a non-global QCD observable and find the
possible breakdown of QCD coherence. This breakdown arises as a result of wide
angle soft gluon emission developing a sensitivity to emission at small angles
and it leads to the appearance of super-leading logarithms. We use the `gaps
between jets' cross-section as a concrete example and illustrate that the new
logarithms are intimately connected with the presence of Coulomb gluon
contributions. Numerical estimates of their potential phenomenological
significance are presented.


title:
Search for millicharged particles in reactor neutrino experiments: a
  probe of the PVLAS anomaly

abstract:
  It has been recently suggested that the vacuum magnetic dichroism observed by
the PVLAS experiment could be explained by the pair production of a new light,
m ~0.1 eV, millicharged, q ~ 3 10^{-6} e, fermions. In addition, it has been
pointed out that millicharged particles with q > 10^{-9} e appear naturally in
models based on the string theory. We show that low energy reactor neutrino
experiments provide a sensitive probe of millicharged particles. Considering,
as an example, recent results of the TEXONO experiment searching for neutrino
magnetic moment, a new upper bound q < 10^{-5} e for the mass region m < 1 keV
is derived. These results enhance motivations for a more sensitive search for
such particles in near future experiments. Furthemore, a direct experimental
limit on the electric charge of the electron antineutrino q < 3.7 10^{-12} e is
obtained.


title: Top and Bottom Squarks Decays under Cosmological Bounds

abstract:
  We investigate the fermionic decays of top squarks tilde t_{1,2} and bottom
squarks tilde b_{1,2}$ in the Minimal Supersymmetric Standard Model with
complex parameters M_1, mu, A_t and A_b . In the analysis we particularly take
into account the cosmological bounds imposed by WMAP data. We plot the CP phase
dependences of stop and sbottom decay widths.


title: Equivalence Principle and Partition of Angular Momenta in the Nucleon

abstract:
  The manifestation of equivalence principle (EP) in spin-gravity interactions,
resulting in the nullification of the corresponding analog of Anomalous
Magnetic moment is explored. Its tests in the experiments with atoms and cold
neutrons are discussed. The validity of EP separately for quarks and gluons in
the nucleon resulting in exact equipartition of momentum and total angular
momentum is conjectured. The important role of relocalization (Belinfante)
invariance in these and other aspects of nucleon spin structure is stressed.


title:
String Scale Gauge Coupling Unification with Vector-like Exotics and
  Non-Canonical U(1)_Y Normalization

abstract:
  We use a new approach to study string scale gauge coupling unification
systematically, allowing both the possibility of non-canonical U(1)_Y
normalization and the existence of vector-like particles whose quantum numbers
are the same as those of the Standard Model (SM) fermions and their Hermitian
conjugates and the SM adjoint particles. We first give all the independent sets
(Yi) of particles that can be employed to achieve SU(3)_C and SU(2)_L string
scale gauge coupling unification and calculate their masses. Second, for a
non-canonical U(1)_Y normalization, we obtain string scale SU(3)_C x SU(2)_L x
U(1)_Y gauge coupling unification by choosing suitable U(1)_Y normalizations
for each of the Yi sets. Alternatively, for the canonical U(1)_Y normalization,
we achieve string scale gauge coupling unification by considering suitable
combinations of the Yi sets or by introducing additional independent sets (Zi),
that do not affect the SU(3)_C x SU(2)_L unification at tree level, and then
choosing suitable combinations, one from the Yi sets and one from the Zi sets.
We also briefly discuss string scale gauge coupling unification in models with
higher Kac-Moody levels for SU(2)_L or SU(3)_C.


title: Instanton-Induced Polarization in Exclusive Hyperon Photoproduction

abstract:
  It is shown that instantons can provide an explanation of the strong
polarization transfer observed in exclusive hyperon photoproduction at JLab.


title:
Transverse Momentum Dependent Distributions in Hadronic Collisions:
  p(transv. polarized) p --> D + X and p(transv. polarized) p --> gamma + X

abstract:
  Our understanding of the transverse spin structure of hadrons might
definitely get improved by the information we gather on transverse momentum
dependent (TMD) distributions. These new functions could also be crucial for a
description of the observed transverse single spin asymmetries (SSA). In a hard
scattering model for inclusive hadronic reactions, based on a generalized QCD
factorization scheme, many mechanisms - namely the Sivers, Collins,
Boer-Mulders effects - might contribute to a SSA. We show how the k_T dependent
phases arising from the partonic kinematics together with a suitable choice of
experimental configurations could help in disentangling the above mentioned
effects. We discuss their potential role in two inclusive hadronic processes:
heavy meson and photon production in pp and p pbar collisions.


title: Constraints on Gluon Sivers Distribution from RHIC Results

abstract:
  We consider the recent RHIC data on the transverse single spin asymmetry
(SSA) A_N, measured in p(transv. polarized) p --> pion X processes at
mid-rapidity by the PHENIX Collaboration. We analyze this experimental
information within a hard scattering approach based on a generalized QCD
factorization scheme, with unintegrated, transverse momentum dependent (TMD),
parton distribution and fragmentation functions. In this kinematical region,
only the gluon Sivers effect could give a large contribution to A_N; its
vanishing value is thus used to give approximate upper limits on the gluon
Sivers function (GSF). Additional constraints from the Burkardt sum rule for
the Sivers distributions are also discussed.


title: Twist-3 distribution amplitudes of scalar mesons from QCD sum rules

abstract:
  We study the twist-3 distribution amplitudes for scalar mesons made up of two
valence quarks based on QCD sum rules.
  By choosing the proper correlation functions, we derive the moments of the
scalar mesons up to the first two order. Making use of these moments, we then
calculate the first two Gegenbauer coefficients for twist-3 distribution
amplitudes of scalar mesons. It is found that the second Gegenbauer
coefficients of scalar density twist-3 distribution amplitudes for $K^{*}_0$
and $f_0$ mesons are quite close to that for $a_0$, which indicates that the
SU(3) symmetry breaking effect is tiny here. However, this effect could not be
neglected for the forth Gegenbauer coefficients of scalar twist-3 distribution
amplitudes between $a_0$ and $f_0$. Besides, we also observe that the first two
Gegenbauer coefficients corresponding to the tensor current twist-3
distribution amplitudes for all the $a_0$, $K^{*}_0$ and $f_0$ are very small.
The renormalization group evolution of condensates, quark masses, decay
constants and moments are considered in our calculations. As a byproduct, it is
found that the masses for isospin I=1, ${1 \over 2}$ scalar mesons are around
$1.27 \sim 1.41$ GeV and $1.44 \sim 1.56$ GeV respectively, while the mass for
isospin state composed of $\bar{s} s$ is $1.62 \sim 1.73$ GeV.


title: Right-Handed Sneutrino as Cold Dark Matter of the Universe

abstract:
  We consider the minimal supersymmetric standard model (MSSM) extended by
introducing three right-handed (s)neutrinos to account for neutrino masses in
the oscillation experiments. Assuming that the neutrino masses are purely
Dirac-type, the lightest right-handed sneutrino $\tilde \nu_R$ can be the
lightest superparticle (LSP), which is a good candidate of cold dark matter
(CDM) of the universe. We study the possibility of realizing $\tilde
\nu_R$-CDM, paying a special attention to the production of $\tilde \nu_R$ via
decay of the next-to-lightest superparticle (NLSP) after its freeze-out time.
It is shown that the late decay of the MSSM-LSP (the LSP among superparticles
in the MSSM) can produce a sufficient amount of $\tilde \nu_R$ to explain the
observed dark-matter density, and that the $\tilde \nu_R$-CDM scenario can be
realized in a wide range of parameter space. We also consider the constraint on
the decay of MSSM-LSP from the big-bang nucleosynthesis (BBN); we found that
the case with stau being the MSSM-LSP is severely constrained.


title: Standard Model Extension with Gravity and Gravitational Baryogenesis

abstract:
  The Standard Model Extension with the inclusion of gravity is studied in the
framework of the gravitational baryogenesis, a mechanism to generate the baryon
asymmetry based on the coupling between the Ricci scalar curvature and the
baryon current (\partial_\mu R)J^\mu. We show that, during the radiation era of
the expanding Universe, a non vanishing time derivative of the Ricci curvature
arises as a consequence of the coupling between the coefficients for the
Lorentz and CPT violation and Ricci's tensor. The order of magnitude for these
coefficients are derived from current bounds on baryon asymmetry.


title: One Loop Corrections to the Rho Parameter in Higgsless Models

abstract:
  A large class of deconstructed Higgsless model is known to satisfy the
tree-level experimental bounds on the electroweak precision parameters. In
particular, an approximate custodial symmetry insures that the tree-level
$\rho$ parameter is exactly one, for arbitrary values of the model parameters,
and regardless of fermion delocalization. In this note we expand on previous
work by considering the fermionic one-loop contributions to $\rho$, which are
essentially due to loops with top and bottom modes. We analyze the dependence
on the number $N$ of internal SU(2) sites in models with a ``flat background''.
We find that the new-physics contribution rapidly increases with $N$, to
quickly stabilize for large values of $N$. Experimental upper bounds on $\rho$
translate into lower bounds on the mass of the heavy fermions. These, however,
are weakly correlated to $N$, and the three-site model (N=1) turns out to be
already an excellent approximation for the continuum model ($N\to\infty$).


title: Flavor S_4 times Z_2 symmetry and neutrino mixing

abstract:
  We present a model of the lepton masses and flavor mixing based on the
discrete group $S_4 \times Z_2$. In this model, all the charged leptons and
neutrinos are assigned to the $3_\alpha$ representation of $S_4$ in the
Yamanouchi bases. The charged lepton and neutrino masses are mainly determined
by the vacuum expectation value structures of the Higgs fields. A nearly
tri-bimaximal lepton flavor mixing pattern, which is in agreement with the
current experimental results, can be accommodated in our model. The neutrino
mass spectrum takes the nearly degenerate pattern, and thus can be well tested
in the future precise experiments.


title:
Anomalous single production of the fourth generation charged leptons at
  future ep colliders

abstract:
  Possible single productions of the fourth standard model family charged
leptons via anomalous interactions at the future ep colliders are studied.
Signatures of such anomalous processes and backgrounds are discussed in detail.


title: Upper Bound on the Mass of the Type III Seesaw Triplet in an SU(5) Model

abstract:
  We investigate correlation between gauge coupling unification, fermion mass
spectrum, proton decay, perturbativity and ultraviolet cutoff within an SU(5)
grand unified theory with minimal scalar content and an extra adjoint
representation of fermions. We find strong correlation between the upper bound
on the mass of both the bosonic and fermionic SU(2) triplets and the cutoff.
The upper bound on the mass of fermionic triplet responsible for Type III
seesaw mechanism is 10^{2.1} GeV for the Planck scale cutoff. In that case both
the idea of grand unification and nature of seesaw mechanism could be tested at
future collider experiments through the production of those particles.
Moreover, the prediction for the proton decay lifetime is at most an order of
magnitude away from the present experimental limits. If the cutoff is lowered
these predictions change significantly. In the most general scenario, if one
does (not) neglect a freedom in the quark and lepton mixing angles, the upper
bound on the fermionic triplet mass is at 10^{5.4} GeV (10^{10} GeV). Since the
predictions of the model critically depend on the presence of the
higher-dimensional operators and corresponding cutoff we address the issue of
their possible origin and also propose alternative scenarios that implement the
hybrid seesaw framework of the original proposal.


title:
On relative contributions of fusion and fragmentation mechanisms in
  J/psi photoproduction at high energy

abstract:
  We study J/psi photoproduction via the fusion and fragmentation mechanisms at
the HERA Collider within the frameworks of the collinear parton model and the
quasi-multi-Regge kinematics approach using the factorization formalism of
non-relativistic QCD at leading order in the strong-coupling constant alpha_s
and the relative velocity v of the bound quarks. It is shown that the fusion
production mechanism dominates over the fragmentation production mechanism at
the all relevant J/psi transverse momenta. The J/psi meson p_T-spectra in the
fragmentation and fusion production at the asymptotically large p_T have equal
slopes in the quasi-multi-Regge kinematics approach, oppocite the collinear
parton model.


title: The Neutralino Sector in the U(1)-Extended Supersymmetric Standard Model

abstract:
  Motivated by grand unified theories and string theories we analyze the
general structure of the neutralino sector in the USSM, an extension of the
Minimal Supersymmetric Standard Model that involves a broken extra U(1) gauge
symmetry. This supersymmetric U(1)-extended model includes an Abelian gauge
superfield and a Higgs singlet superfield in addition to the standard gauge and
Higgs superfields of the MSSM. The interactions between the MSSM fields and the
new fields are in general weak and the mixing is small, so that the coupling of
the two subsystems can be treated perturbatively. As a result, the mass
spectrum and mixing matrix in the neutralino sector can be analyzed
analytically and the structure of this 6-state system is under good theoretical
control. We describe the decay modes of the new states and the impact of this
extension on decays of the original MSSM neutralinos, including radiative
transitions in cross-over zones. Production channels in cascade decays at the
LHC and pair production at $e^+e^-$ colliders are also discussed.


title:
Model-Independent Description and Large Hadron Collider Implications of
  Suppressed Two-Photon Decay of a Light Higgs Boson

abstract:
  For a Standard Model Higgs boson with mass between 115 GeV and 150 GeV, the
two-photon decay mode is important for discovery at the Large Hadron Collider
(LHC). We describe the interactions of a light Higgs boson in a more
model-independent fashion, and consider the parameter space where there is no
two-photon decay mode. We argue from generalities that analysis of the $t\bar t
h$ discovery mode outside its normally thought of range of applicability is
especially needed under these circumstances. We demonstrate the general
conclusion with a specific example of parameters of a type I two-Higgs doublet
theory, motivated by ideas in strongly coupled model building. We then specify
a complete set of branching fractions and discuss the implications for the LHC.


title: Family symmetries and the SUSY flavour problem

abstract:
  We re-examine the constraints on continuous family symmetries coming from
flavour changing neutral current limits on the D-term contributions to squark
and slepton masses. We show that, for a restricted choice of the familon
sector, continuous family symmetries are consistent with even the most
conservative limits both for the case of gauge mediated supersymmetry breaking
and the case of gravity mediated supersymmetry breaking.


title: Supernovae, Landau Levels, and Pulsar Kicks

abstract:
  We derive the energy asymmetry given the proto-neutronstar during the time
when the neutrino sphere is near the surface of the proto-neutron star, using
the modified URCA process. The electrons produced with the anti-neutrinos are
in Landau levels due to the strong magnetic field, and this leads to asymmetry
in the neutrino momentum, and a pulsar kick. Our main prediction is that the
large pulsar kicks start at about 10 s and last for about 10 s, with the
corresponding neutrinos correlated in the direction of the magnetic field.


title:
Resolving the Octant theta(23) Degeneracy by Neutrino Oscillation
  Experiments

abstract:
  We discuss how and to what extent the degeneracy associated with theta(23),
if it's not maximal, can be resolved by future oscillation experiments which
utilize conventional neutrino beam from accelerator and/or reactor neutrinos.


title:
What is the probability that $\theta_{13}$ and CP violation will be
  discovered in future neutrino oscillation experiments?

abstract:
  The sensitivity of future neutrino oscillation experiments is determined
within a frequentist framework by using a statistical procedure based on Monte
Carlo simulations. I consider the search for a non-zero value of the mixing
angle $\theta_{13}$ at the T2K and Double-Chooz experiments, as well as the
discovery of CP violation at the example of the T2HK experiment. The
probability that a discovery will be made at a given confidence level is
calculated as a function of the true parameter values by generating large
ensembles of artificial experiments. The interpretation of the commonly used
sensitivity limits is clarified.


title:
Chiral behavior of the B(s,d)-Bbar(s,d) mixing amplitude in the Standard
  Model and beyond

abstract:
  We compute the chiral logarithmic corrections to the Bd and Bs mixing
amplitudes in the Standard Model and beyond. We then investigate the impact of
the inclusion of the lowest-lying scalar heavy-light states to the decay
constants and bag-parameters and show that this does not modify the pion chiral
logarithms, but it does produce corrections which are competitive in size with
the K- and eta-meson chiral logarithms. This conclusion is highly relevant to
the lattice studies since the pion chiral logarithms represent the most
important effect in guiding the chiral extrapolations of the lattice data for
these quantities. Also important is to stress that the pion chiral logarithmic
corrections are useful in guiding those extrapolations as long as Mpi << Delta,
where Delta is the mass gap between the scalar and pseudoscalar heavy-light
mesons.


title:
Radiative decays of the $D_{s0}(2317)$, $D_{s1}(2460)$ and the related
  strong coupling constants

abstract:
  In this article, we take the point of view that the charmed mesons
$D_{s0}(2317)$ and $D_{s1}(2460)$ with the spin-parity $0^+$ and $1^+$
respectively are the conventional $c\bar{s}$ states, and calculate the strong
coupling constants $G_S$(for $<D_s^* \phi | D_{s0}>$) and $G_A$(for $<D_s \phi
| D_{s1}>$) in the framework of the light-cone QCD sum rules approach. The
strong coupling constants $G_S$ and $G_A$ are related to the basic parameter
$\hat{\mu}$ in the heavy quark effective Lagrangian, the numerical value is
larger than the existing estimation. With the assumption of the vector meson
dominance of the intermediate $\phi(1020)$, we study the radiative decays
$D_{s0}\to D_s^* \gamma $ and $D_{s1}\to D_s \gamma $.


title: Charmonium hadronic decays and the OZI rule violation effects

abstract:
  We discuss the scalar meson mixing scenario and present an OZI rule violation
mechanism for understanding the scalar productions in charmoium hadronic
decays. We stress that the OZI violation could play a key role in disentangling
the structure of the scalars: $f_0(1370)$, $f_0(1500)$ and $f_0(1710)$.


title: Non-standard Neutrino Oscillations at Icecube

abstract:
  In this talk I review the potential of Icecube for revealing physics beyond
the standard model in the oscillation of atmospheric neutrinos.


title:
Are small neutrino masses unveiling the missing mass problem of the
  Universe?

abstract:
  We present a scenario in which a remarkably simple relation linking dark
matter properties and neutrino masses naturally emerges. This framework points
towards a low energy theory where the neutrino mass originates from the
existence of a light scalar dark matter particle in the MeV mass range. A very
surprising aspect of this scenario is that the required MeV dark matter is one
of the favoured candidates to explain the mysterious emission of 511 keV
photons in the centre of our galaxy. A possible interpretation of these
findings is that dark matter is the stepping stone of a theory beyond the
standard model instead of being an embarrassing relic whose energy density must
be accounted for in any successful model building.


title: Collider Implications of a Non-Universal Higgs

abstract:
  We consider in detail the possibility that the Higgs is wholly or partially
excluded from propagating into one otherwise universal extra dimension. This
exclusion of the Higgs from propagating into an otherwise universal extra
dimension violates tree-level Kaluza-Klein number conservation in the Yukawa
interactions. As a consequence, there is inter-mode mixing between fermions.
For example, zero-mode fermions mix with their associated Kaluza-Klein
excitations. This is in contrast to the original universal extra dimensions
scenario, in which conservation of Kaluza-Klein number prohibits such
inter-mode mixing. Inter-mode mixing is especially significant for the top
quark, since its mass (171.4 +/- 2.1 GeV) is approximately one-half the current
Tevatron mass bound (~350-400 GeV) for Kaluza-Klein excitations of quarks
propagating into universal extra dimensions. We compute the effects that mixing
among the zero-modes and lowest-lying Kaluza-Klein excitations has on the
lightest third-generation charge 2/3 quark mass eigenvalue in the non-universal
Higgs model with one otherwise universal extra dimension. Another consequence
of the inter-mode mixing is that the Kaluza-Klein excitations of the fermions
can decay to a zero-mode Higgs and a corresponding zero-mode fermion. As a
result, the pair production of Kaluza-Klein excitations of the top quark would
lead to two zero-mode Higgs bosons plus a zero-mode top quark/anti-quark pair.
We compute the cross section that the non-universal Higgs model contributes to
Higgs production at the Large Hadron Collider. The effect is quite large: For
example, the Kaluza-Klein contribution to Higgs production is comparable to or
larger than the Standard Model contribution, depending on the Higgs mass, for
compactification scales up to about 600 GeV.


title: Gauge Coupling Unification via A Novel Technicolor Model

abstract:
  We show that the recently proposed minimal walking technicolor theory
together with a small modification of the Standard Model fermionic matter
content leads to an excellent degree of unification of the gauge couplings. We
compare the degree of unification with various time-honored technicolor models
and the minimal supersymmetric extension of the Standard Model. We find that,
at the one-loop level, the new theory provides a degree of unification higher
than any of the other extensions above. The phenomenology of the present model
is very rich with various potential dark matter candidates.


title: Rare Decays as a Probe for New Physics

abstract:
  We discuss the indirect search for new degrees of freedom beyond the standard
model, within flavour physics. In particular, we analyse the minimal flavour
violation hypothesis and its phenomenological implications, especially the
large-tan beta scenario in supersymmetric models, and also compare it with the
constrained minimal flavour violation scenario. Moreover, we briefly discuss
some recent progress in inclusive b to s transitions and present a status
report of the so-called K-pi puzzle.


title:
Microphysics of Cosmic Strings in Supersymmetric and Grand Unified
  Theories

abstract:
  In this thesis we investigate the microphysics of cosmic strings in
non-minimal quantum field theories. In particular we consider theories in which
fermion fields couple to the strings, and those with larger symmetry groups,
such as grand unified and supersymmetric theories. By considering these
extensions to the minimal model, we obtain a more realistic picture of the
properties of cosmic strings.


title: Debye screening in the hot non-Abelian plasma

abstract:
  The Debye mass m_D is computed nonperturbatively in the deconfined phase of
QCD, where chromomagnetic confinement is known to be present. The latter
defines m_D to be m_D=c_D\sqrt{\sigma_s}, where c_D \approx 2 and
\sigma_s=\sigma_s(T) is the spatial string tension. The resulting magnitude of
m_D(T) and temperature dependence are in good agreement with lattice
calculations.


title: Casimir forces and non-Newtonian gravitation

abstract:
  The search for non-relativistic deviations from Newtonian gravitation can
lead to new phenomena signalling the unification of gravity with the other
fundamental interactions. Various recent theoretical frameworks indicate a
possible window for non-Newtonian forces with gravitational coupling strength
in the micrometre range. The major expected background in the same range is
attributable to the Casimir force or variants of it if dielectric materials,
rather than conducting ones, are considered. Here we review the measurements of
the Casimir force performed so far in the micrometre range and how they
determine constraints on non-Newtonian gravitation, also discussing the
dominant sources of false signals. We also propose a geometry-independent
parameterization of all data in terms of the measurement of the constant c. Any
Casimir force measurement should lead, once all corrections are taken into
account, to a determination of the constant c which, in order to assess the
accuracy of the measurement, can be compared with its more precise value known
through microscopic measurements. Although the last decade of experiments has
resulted in solid demonstrations of the Casimir force, the situation is not
conclusive with respect to being able to discover new physics. Future
experiments and novel phenomenological analysis will be necessary to discover
non-Newtonian forces or to push the window for their possible existence into
regions of the parameter space which theoretically appear unnatural.


title: Discovering SUSY with $m_0^2 < 0$ in the First LHC Physics Run

abstract:
  In minimal supergravity, the parameter space where the slepton is the LSP is
usually neglected, because of strong constraints on charged dark matter. When
the gravitino is the true LSP, this region avoids these constraints and offers
spectacular collider signals. We investigate this scenario for the LHC and find
that a large portion of the ignored mSugra parameter space can lead to
discovery within the first physics run, with 1-4 $\text{fb}^{-1}$ of data. We
find that there are regions where discovery is feasible with only 1 day of
running.


title: A Simulation of QCD Radiation in Top Quark Decays

abstract:
  In this paper we describe a theoretical framework and algorithms for
implementing QCD corrections to top quark decays in the Herwig++ event
generator. The dominant corrections, due to soft and collinear emissions, are
summed to all orders through the coherent parton branching formalism. In
addition, unenhanced first-order matrix-element corrections are included to
account for large transverse momentum emissions.


title: $\tau$ Polarization in SUSY Cascade Decays

abstract:
  $\tau$ leptons emitted in cascade decays of supersymmetric particles are
polarized. The polarization may be exploited to determine spin and mixing
properties of the neutralinos and stau particles involved.


title: Thermal decoupling of WIMPs from first principles

abstract:
  Weakly interacting massive particles (WIMPs) are arguably the most natural DM
candidates from a particle physics point of view. After their number density
has frozen out in the early universe, determining their relic density today,
WIMPs are still kept very close to thermal equilibrium by scattering events
with standard model particles. The complete decoupling from the thermal bath
happens as late as around 1-10 MeV, thereby setting an important cosmological
scale that can directly be translated into a small-scale cutoff of the spectrum
of matter density fluctuations. We present here a full analytic treatment of
the kinetic decoupling process from first principles. This allows an exact
determination of the decoupling scale, for an arbitrary WIMP candidate and any
scattering amplitude. As an application, we consider the situation of the
lightest supersymmetric particle as well as the lightest Kaluza-Klein particle
that arises in theories with universal extra dimensions; furthermore, we show
that our formalism can also easily be applied to, e.g., the evolution of the
non-relativistic electrons into the recombination regime. Finally, we comment
on the impacts for the smallest gravitationally bound structures and the
prospects for the indirect detection of dark matter.


title:
The fifth dimension as an analogue computer for strong interactions at
  the LHC

abstract:
  We present a mechanism to get S ~ 0 or even negative, without bringing into
play the SM fermion sector. This mechanism can be applied to a wide range of 5D
models, including composite Higgs and Higgsless models. As a realization of the
mechanism we introduce a simple model, although the effect on S does not rely
on the underlying dynamics generating the background. Models that include this
mechanism enjoy the following features: weakly-coupled light resonances (as
light as 600 GeV) and degenerate or inverted resonance spectrum.


title: Linear Sigma Model at finite baryonic density and symmetry breakings

abstract:
  The linear sigma model at finite baryonic density with a massive vector field
is investigated considering that all the bosonic fields develop non zero
expected classical values, eventually associated to condensates and
corresponding to dynamical symmetry breakings which might occur in the QCD
phase diagram. A modified equation for the classical vector field is proposed
with its respective solution. Some in medium properties of the model (mainly
masses) are investigated within reasonable prescriptions. In particular the
behavior of the {\it in medium} pion and sigma masses and a particular way of
calculating {\it in medium} coupling to baryons is investigated. A symmetry
radius for finite baryonic densities is proposed and calculated in different
ways in terms of the other variables of the model and these different ways of
calculating it agree quite well. However, assuming that the pion and sigma
masses go to zero close to the restoration of chiral symmetry a too high value
for the critical density is obtained $\rho_c \simeq 4.3 \rho_0$.


title: A Simple Model of Low-scale Direct Gauge Mediation

abstract:
  We construct a calculable model of low-energy direct gauge mediation making
use of the metastable supersymmetry breaking vacua recently discovered by
Intriligator, Seiberg and Shih. The standard model gauge group is a subgroup of
the global symmetries of the SUSY breaking sector and messengers play an
essential role in dynamical SUSY breaking: they are composites of a confining
gauge theory, and the holomorphic scalar messenger mass appears as a
consequence of the confining dynamics. The SUSY breaking scale is around 100
TeV nevertheless the model is calculable. The minimal non-renormalizable
coupling of the Higgs to the DSB sector leads in a simple way to a mu-term,
while the B-term arises at two-loop order resulting in a moderately large tan
beta. A novel feature of this class of models is that some particles from the
dynamical SUSY breaking sector may be accessible at the LHC.


title: Holographic Bosonic Technicolor

abstract:
  We consider a technicolor model in which the expectation value of an
additional, possibly composite, scalar field is responsible for the generation
of fermion masses. We define the dynamics of the strongly coupled sector by
constructing its holographic dual. Using the AdS/CFT correspondence, we study
the S parameter and the phenomenology of the light technihadrons. We find that
the S parameter is small over a significant region of the model's parameter
space. The particle spectrum is distinctive and includes a nonstandard Higgs
boson as well as heavier hadronic resonances. Technihadron masses and decay
rates are calculated holographically, as a function of the model's parameters.


title: Impact of Single-Top Measurement to Littlest Higgs Model with T-Parity

abstract:
  We show that a precise measurement of the single-top production cross section
at the Tevatron and the LHC can strongly constrain the model parameters of the
Littlest Higgs model with T-parity. A reduction in the single-top production
rate from the Standard Model prediction implies new physics phenomena generated
by the heavy T-parity partners of the top quark. We show that the degree of
polarization of the top quark produced from the decay of its heavy T-odd
partner ($T_{-}$) can be utilized to determine the new physics energy scale,
and the mass of $T_{-}$ can be measured from the missing transverse momentum
distribution in the $T_{-}\bar{T}_{-}$ event.


title: Multiquark states as di-hadronic molecules

abstract:
  Multiquark systems such as tetraquarks, pentaquarks and hexaquarks states are
studied as di-hadronic molecules in a nonrelativistic model. The masses of
several di-hadronic states using a molecular interaction provided by asymptotic
expression of the confined gluon exchange potential are computed. The exotic
states such as f$_0$ (0.982), f$_2$ (1.565), f$_2$ (1.950), X(3.87), D$_{sJ}$
(2.317, 2.460, 2.632), $\psi$(4.040) etc are identified as the low lying
di-mesonic states, and $\Theta^+$ (1.54) as a $K-N$ molecular state.


title: Recent Models of Neutrino Masses and Mixing

abstract:
  In this talk, I have reviewed few recent models on neutrino masses and
mixing. Particularly, I have emphasised on $A_4$ symmetric models.


title:
Electromagnetic properties of nucleons and hyperons in a Lorentz
  covariant quark model

abstract:
  We calculate magnetic moments of nucleons and hyperons and N -> Delta + gamma
transition characteristics using a manifestly Lorentz covariant chiral quark
approach for the study of baryons as bound states of constituent quarks dressed
by a cloud of pseudoscalar mesons.


title: The WIMP of a Minimal Technicolor Theory

abstract:
  We consider the possibility that a massive fourth family neutrino, predicted
by a recently proposed minimal technicolor theory, could be the source of the
dark matter in the universe. The model has two techniflavors in the adjoint
representation of an SU(2) techicolor gauge group and its consistency requires
the existence of a fourth family of leptons. By a suitable hypercharge
assignement the techniquarks together with the new leptons look like a
conventional fourth standard model family. We show that the new (Majorana)
neutrino N can be the dark matter particle if $m_N \sim 100-500$ GeV and the
expansion rate of the Universe at early times is dominated by an energy
component scaling as $\rho_\phi \sim a^{-6}$ (kination), with
$\rho_\phi/\rho_{\rm rad} \sim 10^{-6}$ during the nucleosynthesis era.


title:
Beam-helicity asymmetry in photon and pion electroproduction in the
  Delta(1232) resonance region at Q^2= 0.35 (GeV/c)^2

abstract:
  The beam-helicity asymmetry has been measured simultaneously for the
reactions (e p \to e p \gamma) and (e p \to e p \pi^0) in the $\Delta (1232)$
resonance region at $Q^2=$ 0.35 (GeV/c)$^2$. The experiment was performed at
MAMI with a longitudinally polarized beam and an out-of-plane detection of the
proton. The results are compared with calculations based on Dispersion
Relations for virtual Compton scattering and with the MAID model for pion
electroproduction. There is an overall good agreement between experiment and
theoretical calculations. The remaining discrepancies may be ascribed to an
imperfect parametrization of some $\gamma^{(*)} N \to \pi N$ multipoles, mainly
contributing to the non-resonant background. The beam-helicity asymmetry in
both channels ($\gamma$ and $\pi^0$) shows a good sensitivity to these
multipoles and should allow future improvement in their parametrization.


title:
Hunting for the Top Partner in the Littlest Higgs Model with T-parity at
  the LHC

abstract:
  We study the Littlest Higgs model with T-parity at the LHC through pair
productions of the T-odd top quark partner (T_-) which decays into the top
quark and the lightest T-odd particle. We identify the region of parameters
favored by the electroweak and cosmological considerations. The signal and
background events are simulated with fast detector simulation to study the
discovery potential at the LHC. We find that the hemisphere analysis recently
proposed by the CMS collaboration is very useful to separate the signal from
the t\bar{t} background. We discuss the observability of the top tagged signal
in the effective mass (M_{eff}) versus the transverse missing energy
(E_{Tmiss}) plane. We show that, for all our sample parameter sets with M_{T_-}
\leq 900 GeV, the excess of the signal over the background can be visible as a
bump structure in the E_{Tmiss} distribution for 50 fb^{-1} at relatively high
M_{eff} intervals.


title:
Proceedings to the 9th Workshop 'What Comes Beyond the Standard Models',
  Bled, September 16. - 26., 2006, Slovenia

abstract:
  Contents: 1. Child Universes in the Laboratory (S. Ansoldi and E.I.
Guendelman) 2. Relation between Finestructure Constants at the Planck Scale
from Multiple Point Principle (D.L. Bennett, L.V. Laperashvili and H.B.
Nielsen) 3. On the Origin of Families of Fermions and Their Mass Matrices --
Approximate Analyses of Properties of Four Families Within Approach Unifying
Spins and Charges (M. Breskvar, D. Lukman and N.S. Mankoc Borstnik) 4.
Cosmoparticle Physics: Cross-disciplinary Study of Physics Beyond the Standard
Model (M.Yu. Khlopov) 5. Discussion Section on 4th Generation (M.Yu. Khlopov)
6. Involution Requirement on a Boundary Makes Massless Fermions Compactified on
a Finite Flat Disk Mass Protected (N.S. Mankoc Borstnik and H.B. Nielsen) 7.
How Can Group Theory be Generalized so Perhaps Providing Further Information
About Our Universe? (R. Mirman) 8. FutureDependent Initial Conditions from
Imaginary Part in Lagrangian (H.B. Nielsen and M. Ninomiya) 9. Coupling
Self-tuning to Critical Lines From Highly Compact Extra Dimensions (K. Petrov)


title: Concluding talk at NOW 2006

abstract:
  This writeup summarizes the status of neutrino oscillations, including recent
fluxes and experimental data, as of summer 2006. A discussion is given on the
current status of absolute scale of neutrino mass from tritium, neutrinoless
double beta decay and cosmological observations, as well as the prospects for
the next generation of experiments, including lepton flavor violation searches,
and their theoretical significance.


title: Yukawa Textures, New Physics and Nondecoupling

abstract:
  We point out that New Physics can play an important r\^ ole in rescuing some
of the Yukawa texture zero ans\" atze which would otherwise be eliminated by
the recent, more precise measurements of $V_{CKM}$. As an example, a detailed
analysis of a four texture zero ansatz is presented, showing how the presence
of an isosinglet vector-like quark which mixes with standard quarks, can render
viable this Yukawa texture. The crucial point is the nondecoupling of the
effects of the isosinglet quark, even for arbitrary large values of its mass.


title: Color-flavor locked strangelets in a quark mass density-dependent model

abstract:
  The color-flavor locked (CFL) phase of strangelets is investigated in a quark
mass density-dependent model. Parameters are determined by stability arguments.
It is concluded that three solutions to the system equations can be found,
corresponding, respectively, to positively charged, negatively charged, and
nearly neutral CFL strangelets. The charge to baryon number of the positively
charged strangelets is smaller than the previous result, while the charge of
the negatively charged strangelets is nearly proportional in magnitude to the
cubic-root of the baryon number. However, the positively charged strangelets
are more stable compared to the other two solutions.


title: Higgs Boson Production via Gluon Fusion: Squark Loops at NLO QCD

abstract:
  The loop-induced processes gg -> h,H,A provide the dominant Higgs boson
production mechanisms at the Tevatron and LHC in a large range of the minimal
supersymmetric extension of the Standard Model. For squark masses below \sim
400 GeV squark loop contributions become important in addition to the top and
bottom quark loops. The next-to-leading order QCD corrections to the squark
contributions of these processes are determined including the full squark and
Higgs mass dependences. They turn out to be large and thus important for the
Tevatron and LHC experiments. Squark mass effects of the K factors can be of
O(20%). In addition we derive the QCD corrections to the squark contributions
of the rare photonic Higgs decays h,H -> gamma gamma, which play a role for the
Higgs searches at the LHC.


title: Shear viscosity of pion gas

abstract:
  Using chiral perturbation theory we investigate the QCD shear viscosity
($\eta $) to entropy density ($s$) ratio below the deconfinement temperature
($\sim 170$ MeV) with zero baryon number density. It is found that $\eta /s$ of
QCD is monotonically decreasing in temperature ($T$) and reaches 0.6 with
estimated $\sim 50%$ uncertainty at T=120 MeV. A naive extrapolation of the
leading order result shows that $\eta /s$ reaches the $1/4\pi $ minimum bound
proposed by Kovtun, Son, and Starinets using string theory methods at $T\sim
210$ MeV. This suggests a phase transition or cross over might occur at
$T\lesssim 210$ MeV in order for the bound to remain valid. Also, it is natural
for $\eta /s$ to stay close to the minimum bound around the phase transition
temperature as was recently found in heavy ion collisions.


title: A Heavy Quark-Antiquark Pair in Hot QCD

abstract:
  Thermodynamics of a heavy quark-antiquark pair in SU(3)-QCD is studied both
below and above the deconfinement critical temperature $T_c$. In the quenched
case, a model of the string passing through heavy valence gluons yields a
correct estimate of $T_c$ and the critical behavior of the string tension below
$T_c$. For two light flavors, entropy and internal energy below $T_c$ can be
obtained from the partition function of heavy-light mesons and baryons. To
calculate the free energy of the system above $T_c$, we apply second-order
perturbation theory in the interaction of the quark-gluon plasma constituents
with the static quark-antiquark pair. The results for the entropy and internal
energy, obtained both below and above $T_c$, are compared with recent lattice
data.


title: Antenna subtraction with hadronic initial states

abstract:
  The antenna subtraction method for the computation of higher order
corrections to jet observables and exclusive cross sections at collider
experiments is extended to include hadronic initial states. In addition to the
already known antenna subtraction with both radiators in the final state
(final-final antennae), we introduce antenna subtractions with one or two
radiators in the initial state (initial-final or initial-initial antennae). For
those, we derive the phase space factorization and discuss the allowed phase
space mappings at NLO and NNLO. We present integrated forms for all antenna
functions relevant to NLO calculations, and describe the construction of the
full antenna subtraction terms at NLO on two examples. The extension of the
formalism to NNLO is outlined.


title: TeV Scale Mirage Mediation and Natural Little SUSY Hierarchy

abstract:
  TeV scale mirage mediation has been proposed as a supersymmetry breaking
scheme reducing the fine tuning for electroweak symmetry breaking in the
minimal supersymmetric extension of the standard model. We discuss a moduli
stabilization set-up for TeV scale mirage mediation which allows an
extra-dimensional interpretation for the origin of supersymmetry breaking and
naturally gives an weak-scale size of the Higgs B-parameter. The set-up
utilizes the holomorphic gauge kinetic functions depending on both the heavy
dilaton and the light volume modulus whose axion partners are assumed to be
periodic fields. We also examine the low energy phenomenology of TeV scale
mirage mediation, particularly the constraints from electroweak symmetry
breaking and FCNC processes.


title:
Charged right-handed Higgsino field contribution to the chargino mass
  spectrum and inverse parameter problem in Left-Right Supersymmetric Models

abstract:
  The contribution of the charged right-handed higgsino fields to the chargino
mass spectrum in the context of the Left-Right Supersymmetric Model is studied.
Analytical expressions for the chargino masses assuming arbitrary CP-violating
phases are given. Also, the corresponding inverse parameter problem is studied.
Analytical disentangling of some relevant parameters is presented. A general
inversion algorithm, based on suitable measurement of cross-section type
observables associated to chargino pair production in electron positron
annihilation, is proposed.


title: Stability and Evolution of Color Skyrmions in the Quark-Gluon Plasma

abstract:
  We show the existence of unstable color skyrmions in a class of nonabelian
fluid models. Oscillating and expanding solutions are found in the
time-dependent case.


title: Next-to-leading BFKL phenomenology of forward-jet cross sections at HERA

abstract:
  We show that the forward-jet measurements performed at HERA allow for a
detailed study of corrections due to next-to-leading logarithms (NLL) in the
Balitsky-Fadin-Kuraev-Lipatov (BFKL) approach. While the description of the
d\sigma/dx data shows small sensitivity to NLL-BFKL corrections, these can be
tested by the triple differential cross section d\sigma/dxdk_T^2dQ^2 recently
measured. These data can be successfully described using a
renormalization-group improved NLL kernel while the standard
next-to-leading-order QCD or leading-logarithm BFKL approaches fail to describe
the same data in the whole kinematic range. We present a detailed analysis of
the NLL scheme and renormalization-scale dependences and also discuss the
photon impact factors.