title: Leptonic CP Violation and Baryon Asymmetry

abstract:
  The observation of neutrino masses leads to the possibility of leptonic
mixing and CP violation. One of the simplest extensions of the Standard Model
giving rise to neutrino masses consists of the introduction of one righthanded
neutrino field per generation, singlet of SU(2). In the context of the seesaw
mechanism this leads to three light and three heavy neutrinos. The charged
current interactions couple the charged leptons to both the light and the heavy
physical neutrinos and leptonic CP violation may occur at low energies as well
as at high energies giving rise to the possibility of leptogenesis. There are
special scenarios where it is possible to establish a connection between CP
violation at the two different scales, an interesting example is included in
this work. Furthermore, we describe how the conjecture that all phenomena of CP
violation present in nature could have a common origin can be realized in the
framework of a further minimal extension of the Standard Model with CP broken
through the phase of the vacuum expectation value of a complex Higgs singlet.


title:
Phenomenology of non-universal gaugino masses in supersymmetric grand
  unified theories

abstract:
  Grand unified theories can lead to non-universal boundary conditions for the
gaugino masses at the unification scale. We consider the implications of such
non-universal boundary conditions for the composition of the lightest
neutralino as well as for the upper bound on its mass in the simplest
supersymmetric grand unified theory based on the SU(5) gauge group. We derive
sum rules for neutralino and chargino masses in different representations of
SU(5) which lead to different non-universal boundary conditions for the gaugino
masses at the unification scale. We also consider the phenomenological
implications of the non-universal gaugino masses arising from a grand unified
theory in the context of Large Hadron Collider. In particular we investigate
the detection of heavy neutral Higgs bosons $H^0, A^0$ from $H^0, A^0 \to
\tilde{\chi}_2^0 \tilde{\chi}_2^0 \to 4l $, and study the possibilities of
detecting the neutral Higgs bosons in cascade decays, including the decays
$\tilde{\chi}_i^0 \to h^0 (H^0, A^0) \tilde{\chi}_1^0 \to b\bar{b}
\tilde{\chi}_1^0$.


title: g_phi-pion-gamma coupling constant in light cone QCD sum rules

abstract:
  The coupling constant of g_phi-pion-gamma decay is calculated using light
cone QCD sum rules. A comparison of our result with the ones existing in the
literature is presented.


title:
Remarks on Limits on String Scale from Proton Decay and Low-Energy
  amplitudes in Braneworld Scenario

abstract:
  We discuss IR limit of four-fermion scattering amplitudes in braneworld
models including intersecting-branes and SUSY SU(5) GUT version of it. With
certain compactification where instanton effect is negligible, grand
unification condition in D6-D6 intersecting-branes scenario subject to
experimental constraint on proton decay provides possibility for upper limit on
the string scale, $M_S$, through relationship between the string coupling,
$g_s$, and the string scale. We discuss how IR divergence is related to number
of twisted fields we have to introduce into intersection region and how it can
change IR behaviour of tree-level amplitudes in various intersecting-branes
models. Using number of twisted fields, we identify some intersecting-branes
models whose tree-level amplitudes are purely stringy in nature and
automatically proportional to $g_s/M^2_{S}$ at low energy. They are
consequently suppressed by the string scale. For comparison, we also derive
limit on the lower bound of the string scale from experimental constraint on
proton decay induced from purely stringy contribution in the coincident-branes
model, the limit is about $10^5$ TeV.


title: New features of two-particle correlations

abstract:
  We show that a recently proposed derivation of Bose-Einstein correlations
(BEC) by means of thermal Quantum Field Theory, supplemented by operator-field
evolution of Langevin type, allows a deeper understanding of a possible
coherent behaviour of the emitting source and a clear identification of the
origin of the observed shape of the 2-particle BEC function $C_2(Q)$. We
explain the origin of the dependence of the measured correlation radius on the
hadron mass. The lower bound of the particle source size is estimated.


title: Black Holes and Massive Elementary Particles in Resummed Quantum Gravity

abstract:
  Einstein's general theory of relativity poses many problems to the quantum
theory of point particle fields. Among them is the fate of a massive point
particle. Since its rest mass exists entirely within its Schwarzschild radius,
in the classical solutions of Einstein's theory, the respective system should
be a black hole. We address this issue using exact results in a new approach to
quantum gravity based upon well-tested resummation methods in point particle
quantum field theory. We show that the classical conclusion is obviated by
quantum loop effects. We show that our new approach already passes two
theoretical checks with the published literature; for, it reproduces known
results on the one-loop correction to the graviton self-energy in scaler matter
coupled to Einstein's gravity as analyzed by 't Hooft and Veltman and it is
consistent with the asymptotic safety results of Bonnanno and Reuter on the
behavior of Newton's constant in the deep Euclidean regime. Indeed, our
approach is consistent with the black hole phenomenology of the latter authors,
including their results on the final state of the Hawking radiation for an
originally massive black hole. Further black hole related phenomenological
implications are also discussed.


title:
Escaping the Large Fine Tuning and Little Hierarchy Problems in the Next
  to Minimal Supersymmetric Model and h-> aa Decays

abstract:
  We demonstrate that the NMSSM can have small fine tuning and modest light
stop mass while still evading all experimental constraints. For small tan(beta)
[large tan(beta)], the relevant scenarios are such that there is always (often)
a SM-like Higgs boson that decays to two lighter -- possibly much lighter --
pseudoscalar Higgses.


title: Supersymmetry and the Lorentz Fine Tuning Problem

abstract:
  If physics at the Planck scale requires new conceptions of space-time, then
generic renormalizable field theories predict observable violations of Lorentz
invariance in the low energy sector. The little recognized ``Lorentz Fine
Tuning Problem'' comes from logarithmic loop corrections which are not
suppressed to the enormous extent commonly assumed. Fine-tuning of parameters
at the Planck scale is one possible but unpalatable solution. Here we show that
violation of Lorentz invariance is highly suppressed in a supersymmetric
theory, the Wess-Zumino model. We conjecture that supersymmetry may be further
motivated by yet another fine tuning problem of ordinary quantum field
theories.


title:
Evaluation of the isospin asymmetry of the nucleon structure functions
  with CLAS++

abstract:
  The possibility to estimate the isospin symmetry breaking effects in the
non-perturbative part of F_2 structure function of the chargeg lN
deep-pnelastic scattering, which will provide CLAS++ dewtector of the upgraded
TJNAF machine at $Q^2\approx 2 GeV^2$, is discussed. The problems of the
Gottfried sum rule extraction are also considered.


title: Understanding transversity: present and future

abstract:
  I review the present state of knowledge concerning transversity distributions
and related observables. In particular, I discuss the phenomenology of
transverse asymmetries in e p\uparrow, p p\uparrow, p\uparrow p\uparrow and
pbar \uparrow p\uparrow scattering, and the perspectives of ongoing and future
research.


title: Excited hadrons as a signal for quark-gluon plasma formation

abstract:
  At the quark-hadron transition, when quarks get confined to hadrons, certain
orbitally excited states, namely those which have excitation energies above the
respective $L = 0$ states of the same order as the transition temperature
$T_c$, may form easily because of thermal velocities of quarks at the
transition temperature. We propose that the ratio of multiplicities of such
excited states to the respective $L = 0$ states can serve as an almost model
independent signal for the quark-gluon plasma formation in relativistic
heavy-ion collisions. For example, the ratio $R^*$ of multiplicities of
$D_{SJ}^{*\pm}(2317)(J^P = 0^+)$ and $D_S^{*\pm}(2112)(J^P = 1^-)$ when plotted
with respect to the center of mass energy of the collision $\sqrt{s}$ (or vs.
centrality/number of participants), should show a jump at the value of
$\sqrt{s}$ beyond which the QGP formation occurs. This should happen
irrespective of the shape of the overall plot of $R^*$ vs. $\sqrt{s}$. Recent
data from RHIC on $\Lambda^*/\Lambda$ vs. N$_{part}$ for large values of
N$_{part}$ may be indicative of such a behavior, though there are large error
bars. We give a list of several other such candidate hadronic states.


title: Gluon-Gluon Antenna Functions from Higgs Boson Decay

abstract:
  Antenna functions describe the infrared singular behaviour of colour-ordered
QCD matrix elements due to the emission of unresolved partons inside an antenna
formed by two hard partons. In this paper, we show that antenna functions for
hard gluon-gluon pairs can be systematically derived from the effective
Lagrangian describing Higgs boson decay into gluons, and compute the the
infrared structure of the colour-ordered Higgs boson decay matrix elements at
NLO and NNLO.


title:
The value of B_K from the experimental data on CP-violation in K-mesons
  and up-to-date values of CKM matrix parameters

abstract:
  The difference between induced by box diagram quantity \tilde \epsilon and
experimentally measured value of \epsilon is determined and used to obtain the
value of \tilde \epsilon with high precision. Present day knowledge of CKM
matrix elements (including B-factory data), allows us to obtain from the
Standard Model expression for \tilde \epsilon the value of parameter B_K: B_K =
0.89 \pm0.16. It turns out to be very close to the result of vacuum insertion,
B_K = 1.


title: CP-violating asymmetry in chargino decay into neutralino and W boson

abstract:
  In the MSSM with complex parameters, loop corrections to $\cha_i^\pm \to
\neu_j^0 W^\pm$ lead to a CP violating asymmetry $\ACP = (\Gamma(\cha_i^+ \to
\neu_j^0 W^+) - \Gamma(\cha_i^- \to \neu_j^0 W^-))/ (\Gamma(\cha_i^+ \to
\neu_j^0 W^+) + \Gamma(\cha_i^- \to \neu_j^0 W^-))$. We calculate this
asymmetry at full one-loop level. We perform a detailed numerical analysis for
$\cha_1^\pm \to \neu_1^0 W^\pm$ and $\cha_2^\pm \to \neu_1^0 W^\pm$ analyzing
the dependence on the parameters and phases involved. Asymmetries of several
percent are obtained. We also discuss the feasability of measuring these
asymmtries at LHC.


title: Asymptotic Freedom: From Paradox to Paradigm

abstract:
  Asymptotic freedom was developed as a response to two paradoxes: the
weirdness of quarks, and in particular their failure to radiate copiously when
struck; and the coexistence of special relativity and quantum theory, despite
the apparent singularity of quantum field theory. It resolved these paradoxes,
and catalyzed the development of several modern paradigms: the hard reality of
quarks and gluons, the origin of mass from energy, the simplicity of the early
universe, and the power of symmetry as a guide to physical law.


title: From Classical to Quantum Saturation in the Nuclear Gluon Distribution

abstract:
  We study the gluon content of a large nucleus (i) in the semi-classical
McLerran-Venugopalan model and (ii) in the high energy limit as given by the
quantum evolution of the Color Glass Condensate. We give a simple and
qualitative description of the Cronin effect and high-pT suppression in
proton-nucleus collisions.


title: Models for Light-Cone Meson Distribution Amplitudes

abstract:
  Leading-twist distribution amplitudes (DAs) of light mesons like pi,rho etc.
describe the leading nonperturbative hadronic contributions to exclusive QCD
reactions at large energy transfer, for instance electromagnetic form factors.
They also enter B decay amplitudes described in QCD factorisation, in
particular nonleptonic two-body decays. Being nonperturbative quantities, DAs
cannot be calculated from first principles, but have to be described by models.
Most models for DAs rely on a fixed order conformal expansion, which is
strictly valid for large factorisation scales, but not always sufficient in
phenomenological applications. We derive models for DAs that are valid to all
orders in the conformal expansion and characterised by a small number of
parameters which are related to experimental observables.


title:
Electroweak phase transition and Higgs self-couplings in the
  two-Higgs-doublet model

abstract:
  We calculate both the cubic and the quartic self-couplings of the lighter
scalar Higgs boson without assuming the decoupling limit in the
two-Higgs-doublet model (THDM). In some regions of parameter space of the THDM
where the electroweak phase transition is strongly first order, it is possible
that the quartic self-coupling of the lighter scalar Higgs boson might be
deviated by at least 40 % from the standard model prediction.


title:
Why does set theory necessary to describe charge structure of particles
  ?

abstract:
  It is pointed out that the set theory gave the exact symmetry while the group
theory did not. The triplicity of quarks and leptons is also pointed out. The
reason of seven families of particles and in each family eight number of
particles is elaborated.


title: CP-odd invariants in models with several Higgs doublets

abstract:
  We present CP-odd Higgs-basis invariants, which can be used to signal CP
violation in a multi-Higgs system, written in an arbitrary Higgs basis. It is
shown through specific examples how these CP-odd invariants can also be useful
to determine the character of CP breaking (i.e. whether it is hard or soft CP
breaking) in a given Higgs Lagrangian. We analyse in detail the cases of two
and three Higgs doublets.


title:
From target to projectile and back again: selfduality of high energy
  evolution

abstract:
  We prove that the complete kernel for the high energy evolution in QCD must
be selfdual. The relevant duality transformation is formulated in precise
mathematical terms and is shown to transform the charge density into the
functional derivative with respect to the single-gluon scattering matrix. This
transformation interchanges the high and the low density regimes. We demostrate
that the original JIMWLK kernel, valid at large density is indeed dual to the
low denisity limit of the complete kernel derived recently in hep-ph/0501198.


title: New physics upper bound on the branching ratio of B_s --> l+ l-

abstract:
  We consider the most general new physics effective Lagrangian for b --> s l+
l-. We derive the upper limit on the branching ratio for the processes B_s -->
l+ l- where l=e, mu, subject to the current experimental bounds on related
processes, B --> K l+ l- and B --> K* l+ l-. If the new physics interactions
are of vector/axial-vector form, the present measured rates for B --> (K,K*) l+
l- constrain B(B_s --> l+ l-) to be of the same order of magnitude as their
respective Standard Model predictions. On the other hand, if the new physics
interactions are of scalar/pseudo-scalar form, B --> (K,K*) l+ l- rates do not
impose any constraint on B_s --> l+ l- and the branching ratios of these decays
can be as large as present experimental upper bounds. If future experiments
measure B(B_s --> l+ l-) to be > 10^{-8} then the new physics giving rise to
these decays has to be of the scalar/pseudo-scalar form.


title: Singlet fermions on curved extra dimension tori

abstract:
  A model with two curved compact extra dimensions is introduced. The model is
based on a four-brane immersed in a six dimensional space, where the extra
dimensions are compact but not flat. They have topology of torus. The form of
the metric in the empty bulk is studied and the gauge singlet fermion structure
showed to be very simple. It contain only one massless low energy mode which
couples to brane matter, while the massive modes are not related to the volume
of torus while the Planck mass is related to the volume of extra dimensions. In
the model "our" brane is situated on a nearly singular line of the torus.


title:
Operator product expansion coefficient functions in terms of composite
  operators only. Nonsinglet case

abstract:
  A new method for calculating the coefficient functions of the operator
product expansion is proposed which does not depend explicitly on elementary
fields. Coefficient functions are defined entirely in terms of composite
operators. The method is illustrated in the case of QCD nonsinglet operators.


title: Rapidity equilibration and longitudinal expansion at RHIC

abstract:
  The evolution of net-proton rapidity spectra with sqrt(s_NN) in heavy
relativistic systems is proposed as an indicator for local equilibration and
longitudinal expansion. In a Relativistic Diffusion Model, bell-shaped
distributions in central collisions at AGS energies and double-humped
nonequilibrium spectra at SPS show pronounced longitudinal collective expansion
when compared to the available data. The broad midrapidity valley recently
discovered at RHIC in central Au+Au collisions at sqrt(s_NN) = 200 GeV
indicates rapid local equilibration which is most likely due to deconfinement,
and fast longitudinal expansion of the locally equilibrated subsystem. A
prediction is made for Au+Au at sqrt(s_NN)= 62.4 GeV.


title:
Signature of the Minimal Supersymmetric Standard Model with Right-Handed
  Neutrinos in Long Baseline Experiments

abstract:
  The effective interactions which violate a lepton flavor accompanied with
neutrinos (nLFV) are considered. Such a new physics effect is expected to be
measured in future neutrino oscillation experiments with long baseline. They
are induced by radiative correction in the framework of the minimal
supersymmetric standard model with right-handed neutrinos. We numerically
evaluate the size of the couplings for nLFV interactions in this framework. The
slepton mixing is not only the origin of the lepton flavor violation in the
charged lepton sector (cLFV) but also that of the nLFV. We find that the nLFV
couplings are strongly correlated with the corresponding cLFV process, and they
are constrained at $\mathcal{O}(10^{-5})$ times smaller than the standard
four-Fermi couplings.


title:
Unitarity condition method for global fits of the
  Cabibbo-Kobayashi-Maskawa matrix

abstract:
  We report on an exact method for global fits of the CKM matrix by using the
necessary and sufficient conditions the data have to satisfy in order to find a
unitary matrix compatible with them, and this method can be applied to both
quark and lepton CKM matrices. The key condition writes $-1\le\cos\delta\le 1$
where $\delta$ is the phase that encodes the CP violation, and it is obtained
when one describes the CKM matrix in terms of four moduli of its entries. We
use it to reconstruct many approximate unitary matrices from the PDG data, and
by using the double stochasticity property of the unitary matrices we find a
strong dependence of $\sin 2\beta$ on $|U_{ub}|$, that implies also strong
correlations between $|U_{ij}|$ themselves, proving the constraining power of
this approach.


title: ADD extra dimensional gravity and di-muon production at LHC

abstract:
  A possibility to observe TeV-scale gravity signals at the LHC is discussed.
The ADD scenario with large extra dimensions is considered and its LHC
discovery potential is derived studying by muon pairs with large invariant
masses.


title: Proton-Antiproton Annihilation in Baryonium

abstract:
  A possible interpretation of the near-threshold enhancement in the
$(p\bar{p})$-mass spectrum in $J/\psi{\to}\gamma p{\bar p}$ is the of existence
of a narrow baryonium resonance X(1860). Mesonic decays of the
$(p\bar{p})$-bound state X(1860) due to the nucleon-antinucleon annihilation
are investigated in this paper. Mesonic coherent states with fixed $G$-parity
and $P$-parity have been constructed . The Amado-Cannata-Dedoder-Locher-Shao
formulation(Phys Rev Lett. {\bf 72}, 970 (1994)) is extended to the decays of
the X(1860). By this method, the branch-fraction ratios of $Br(X\to \eta
4\pi)$, $Br(X\to \eta 2\pi)$ and $Br(X\to 3\eta)$ are calculated. It is shown
that if the X(1860) is a bound state of $(p\bar{p})$, the decay channel ($X\to
\eta 4\pi)$ is favored over $(X\to \eta 2\pi)$. In this way, we develop
criteria for distinguishing the baryonium interpretation for the near-threshold
enhancement effects in $(p\bar{p})$-mass spectrum in $J/\psi{\to}\gamma p{\bar
p}$ from other possibilities. Experimental checks are expected. An intuitive
picture for our results is discussed.


title:
Two-Photon-Exchange Correction to Parity-Violating Elastic
  Electron-Proton Scattering

abstract:
  Higher-order QED effects play an important role in precision measurements of
nucleon elastic form factors in electron scattering. Here we introduce a
two-photon exchange QED correction to the parity-violating polarization
asymmetry of elastic electron-proton scattering. We calculate this correction
in the parton model using the formalism of generalized parton distributions,
and demonstrate that it can reach several per cent in certain kinematics,
becoming comparable in size with existing experimental measurements of
strange-quark effects in the proton neutral weak current.


title: How a Non-hierarchical Neutrino Mass Matrix Can Arise

abstract:
  One puzzle of neutrino masses and mixings is that they do not exhibit the
kind of strong "hierarchy" that is found for the quarks and charged leptons.
Neutrino mass ratios and mixing angles are not small. A possible reason for
this is proposed here. It is based on the fact that typical realistic grand
unified models contain particles with unification-scale masses which, when
integrated out, can yield a neutrino mass matrix that is not of the standard
seesaw form.


title: Pion-pion scattering and the K->3pi decay amplitudes

abstract:
  We revisit the recently proposed method for the determination of the pi-pi
scattering length combination a_{0}-a_{2}, based on the study of the pi0 pi0
spectrum in K+ -> pi+ pi0 pi0. In view of a precision measurement, we discuss
here the effects due to smaller absorptive contributions to the K+ -> pi+ pi0
pi0 and K+ -> pi+ pi+ pi- amplitudes. We outline a method of analysis that can
lead to a precision determination of a_{0}-a_{2} and is based on very general
properties of the S matrix. The discussion of final-state rescattering and cusp
effects is also extended to the two K_L -> 3pi coupled channels. Thanks to the
present work, the theoretical error on the a_{0}-a_{2} combination extracted
from the K+ -> pi+ pi0 pi0 spectrum is reduced to about 5%. A further reduction
requires the evaluation of the effects arising from radiative corrections.


title: Locating the QCD Critical Point in the Phase Diagram

abstract:
  It is shown that the hadronic matter formed at high temperatures, according
to the prescription of the statistical bootstrap principle, develops a critical
point at nonzero baryon chemical potential, associated with the end point of a
first-order, quark-hadron phase-transition line. The location of the critical
point is evaluated as a function of the MIT bag constant.


title: Phenomenological guide to physics beyond the Standard Model

abstract:
  Various aspects of physics beyond the Standard Model are discussed from the
perspective of the fantastic phenomenological success of the Standard Model,
its simplicity and predictive power


title: New Physics and Evidence for a Complex CKM

abstract:
  We carefully analyse the present experimental evidence for a complex CKM
matrix, even allowing for New Physics contributions to $\epsilon_{K}$,
$a_{J/\Psi K_S}$, $\Delta M_{B_{d}}$, $\Delta M_{B_{s}}$, and the $\Delta
I=1/2$ piece of $B\to\rho\rho$ and $B\to\rho\pi$. We emphasize the crucial r\^
ole played by the angle $\gamma$ in both providing irrefutable evidence for a
complex CKM matrix and placing constraints on the size of NP contributions. It
is shown that even if one allows for New Physics a real CKM matrix is excluded
at a 99.92% C.L., and the probability for the phase $\gamma$ to be in the
interval $[-170^\circ;-10^\circ]\cup [10^\circ;170^\circ]$ is 99.7%.


title:
Perturbative corrections to the determination of Vub from the P+
  spectrum in B->X_u l nu

abstract:
  We investigate the relation between the E_gamma spectrum in B->X_s gamma
decay and the P+ spectrum in semileptonic B->X_u l nu decay (P+ is the hadronic
energy minus the absolute value of the hadronic three-momentum), which provides
in principle the theoretically simplest determination of Vub from any of the
"shape function regions" of B->X_u l nu spectra. We calculate analytically the
P+ spectrum to order alpha_s^2 beta_0, and study its relation to the B->X_s
gamma photon spectrum to eliminate the leading dependence on nonperturbative
effects. We compare the result of fixed order perturbation theory to the
next-to-leading log renormalization group improved calculation, and argue that
fixed order perturbation theory is likely to be a more appropriate expansion.
Implications for the perturbative uncertainties in the determination of Vub
from the P+ spectrum are discussed.


title:
Constraints on Flavor Neutrino Masses and
  sin^2(2theta_{12})>>sin^2(theta_{13}) in Neutrino Oscillations

abstract:
  To realize the condition of sin^2(2theta_{12})>>sin^2(theta_{13}), we find
constraints on flavor neutrino masses M_{ij} (ij=e,\mu,\tau): C1) c_{23}^2
M_{\mu\mu} + s_{23}^2 M_{\tau\tau} \approx 2 s_{23} c_{23}M_{\mu\tau} + M_{ee}
and/or C2) |c_{23}M_{e\mu} -s_{23}M_{e\tau}|>> |s_{23}M_{e\mu}
+c_{23}M_{e\tau}|, where c_{23}=cos(theta_{23}) (s_{23}=sin(theta_{23})) and
theta_{12}, theta_{13} and theta_{23} are the mixing angles for three flavor
neutrinos. The applicability of C1) and C2) is examined in models with one
massless neutrino and two massive neutrinos suggested by \det(M)=0, where M is
a mass matrix constructed from M_{ij} (i,j=e,\mu,\tau). To make definite
predictions on neutrino masses and mixings, especially on sin(theta_{13}), that
enable us to trace C1) and C2), M is assumed to possess texture zeros or to be
constrained by textures with M_{\mu\mu}=M_{\tau\tau} or M_{e\tau}=\pm M_{e\mu}
which turn out to ensure the emergence of the maximal atmospheric neutrino
mixing at sin(theta_{13})->0. It is found that C1) is used by textures such as
M_{e\mu}=0 or M_{e\tau}=0 while C2) is used by textures such as M_{e\tau}=\pm
M_{e\mu}.


title: New Parameterization in Muon Decay and the Type of Emitted Neutrino

abstract:
  Normal muon decay, $\mu^{+} \to e^{+}\nu_{e}\bar{\nu_{\mu}}$, is studied as a
tool to discriminate between the Dirac and Majorana types of neutrinos and to
survey the structure of the weak interaction. It is assumed that massive
neutrinos mix with one another and that the interaction Hamiltonian consists of
the $V-A$ and $V+A$ charged currents. A new set of parameters used in place of
the Michel parameters is proposed for the positron distribution. Explicit forms
of these new parameters are obtained by assuming that the masses are less than
10 eV for light neutrinos and sufficiently large for heavy Majorana neutrinos,
which are not emitted in the muon decay. It is shown that a possible method to
discriminate between the Dirac and Majorana cases is to use a characterization
given by the $\chi^2$ fitting of their spectra. It is also confirmed that the
theoretical predictions in the Majorana neutrino case are almost the same as
those obtained from the standard model. Indeed, their differences cannot be
distinguished within the present experimental precision.


title:
Hadron Spin Structure: Novel Effects from Transverse Single Spin
  Asymmetries

abstract:
  Transverse single spin asymmetries can be a challenging tool in our
understanding of the internal structure of hadrons. Some aspects and recent
results are discussed.


title: The hot non-perturbative gluon plasma is an almost ideal colored liquid

abstract:
  We study properties of a gluon plasma above the critical temperature $T_c$ in
a generalized quasi-particle approach with a Lorentz spectral function. The
model parameters are determined by a fit of the entropy $s$ to lattice QCD
data. The effective degrees of freedom are found to be rather heavy and of a
sizeable width. With the spectral width being closely related to the
interaction rate, we find a large effective cross section, which is comparable
to the typical distance squared of the quasiparticles. This suggests that the
system should be viewed as a liquid as also indicated by an estimate of the
plasma parameter $\Gamma$. Furthermore, within the quasiparticle approach we
find a very low viscosity to entropy ratio, $\eta/s \sim 0.2$ for $T > 1.05
T_c$, supporting the recent conjecture of an almost ideal quark-gluon liquid
seen at RHIC.


title:
Isospin-breaking effects on alpha extracted in B --> pi pi, rho rho, rho
  pi

abstract:
  Isospin-breaking in B --> pi pi caused by pi^0-eta-eta' mixing is studied in
a model-independent way using flavor SU(3). Measured branching ratios for B^+
--> pi^+ pi^0, B^+ --> pi^+ eta^(') and B^0 --> pi^0 eta^(') imply an
uncertainty in alpha smaller than 1.4 degree. We find a negligible effect of
pi^0-eta-eta' mixing on alpha in B --> rho pi. Characterizing the effect of
rho^0-omega mixing in B --> rho rho and in B --> rho pi by the two-pion
invariant mass dependence, we point out a way of constraining this effect
experimentally or eliminating it altogether. We show that a model-independent
shift in alpha caused by electroweak penguin amplitudes in B --> pi pi and B
--> rho rho, \Delta alpha_{EWP}=1.5+- 0.3 degree, may be slightly different in
B --> rho pi. Other sources of isospin-breaking in these processes are briefly
discussed.


title:
Generalized parton distributions of the nucleon in constituent quark
  models

abstract:
  Generalized parton distributions (GPDs) are studied at the hadronic
(nonperturbative) scale within different assumptions based on a relativistic
constituent quark model. In particular, by means of a meson-cloud model we
investigate the role of nonperturbative antiquark degrees of freedom and the
valence quark contribution. A QCD evolution of the obtained GPDs is used to add
perturbative effects and to investigate the GPDs' sensitivity to the
nonperturbative ingredients of the calculation at larger (experimental) scale.


title: Theory of hadronic B decays

abstract:
  I give an overview of the theory of hadronic nonleptonic B decays into two
light mesons. Using the soft-collinear effective theory (SCET), a factorization
theorem for these processes has been proven to leading order in 1/mb. The
phenomenological implications of this factorization relation for B-> \pi\pi
decays are discussed, together with the prospects for determining the weak
phase \alpha(\phi_2) from these modes.


title: Lorentz violation of the standard model

abstract:
  Though the standard model of electroweak interactions is commonly believed to
provide a successful unification of electromagnetic and weak interactions, the
approximation in the massless limit and the assumption of massless fermion in
this model should be investigated further with rigorousness. Here it will be
shown that this approximation violates Lorentz invariance and it is still
necessary even with the assumption of a massless fermion and the Higgs
mechanism. We conclude that the unification of electroweak interactions is only
valid with the assumption of Lorentz violation.


title: Photoproduction of Lambda(1520,3/2^-)

abstract:
  We investigate the photoproduction of Lambda(1520,3/2^-) via the gamma N -> K
Lambda^* reaction using the Born approximation and the Rariata-Schwinger
vector-spinor field for the spin 3/2 particle. We reproduce the experimental
data of the total cross section and the angular dependence for the proton
target qualitatively well and estimate them for the neutron target. For the
neutron target, we find much smaller total cross section than that of the
proton and the significant K^*-exchange contribution.


title: Single spin asymmetries in elastic electron-nucleon scattering

abstract:
  We discuss the target and beam normal spin asymmetries in elastic
electron-nucleon scattering which depend on the imaginary part of two-photon
exchange processes between electron and nucleon. In particular, we estimate
these transverse spin asymmetries for beam energies below 2 GeV, where
thetwo-photon exchange process is dominated from the resonance contribution to
the doubly virtual Compton scattering tensor on the nucleon.


title: Color Superconductivity via Supersymmetry

abstract:
  In this talk, a supersymmetric (SUSY) composite model of color
superconductivity is discussed. In this model, quark and diquark
supermultiplets are dynamically generated as massless composites by a newly
introduced confining gauge dynamics. It is analytically shown that the scalar
component of diquark supermultiplets develops vacuum expectation value (VEV) at
a certain critical chemical potential. We believe that our model well captures
aspects of the diquark condensate behavior and helps our understanding of its
dynamics in real QCD. The results obtained here might be useful when we
consider a theory composed of quarks and diquarks.


title: Gapless Hartree-Fock Resummation Scheme for the O(N) Model

abstract:
  A modified selfconsistent Hartree-Fock approximation to the lambda*phi^4
theory with spontaneously broken O(N) symmetry is proposed. It preserves all
the desirable features, like conservation laws and thermodynamic consistency,
of the selfconsistent Dyson scheme generated from a 2PI functional, also known
as the Phi-derivable scheme, while simultaneously respecting the
Nambu-Goldstone theorem in the chiral-symmetry broken phase. Various
approximate resummation schemes are discussed.


title: Damping signatures in future neutrino oscillation experiments

abstract:
  We discuss the phenomenology of damping signatures in the neutrino
oscillation probabilities, where either the oscillating terms or the
probabilities can be damped. This approach is a possibility for tests of
non-oscillation effects in future neutrino oscillation experiments, where we
mainly focus on reactor and long-baseline experiments. We extensively motivate
different damping signatures due to small corrections by neutrino decoherence,
neutrino decay, oscillations into sterile neutrinos, or other mechanisms, and
classify these signatures according to their energy (spectral) dependencies. We
demonstrate, at the example of short baseline reactor experiments, that damping
can severely alter the interpretation of results, e.g., it could fake a value
of $\sin(2\theta_{13})$ smaller than the one provided by Nature. In addition,
we demonstrate how a neutrino factory could constrain different damping models
with emphasis on how these different models could be distinguished, i.e., how
easily the actual non-oscillation effects could be identified. We find that the
damping models cluster in different categories, which can be much better
distinguished from each other than models within the same cluster.


title: QCD at Low Energies

abstract:
  The modern status of basic low energy QCD parameters is reviewed. It is
demonstrated, that the recent data allows one to determine the light quark mass
ratios with an accuracy 10-15%. The general analysis of vacuum condensates in
QCD is presented, including those induced by external fields. The QCD coupling
constant alpha_s is found from the tau-lepton hadronic decay rate. V-A spectral
functions of tau-decay are used for construction of the V-A polarization
operator Pi_{V-A}(s) in the complex s-plane. The operator product expansion
(OPE) is used up to dimension D=10 and the sum rules along the rays in the
complex s-plane are constructed. The best values of quark condensate and
alpha_s<0|qq|0>^2 are found. The value of quark condensate is confirmed by
considering the sum rules for baryon masses. Gluon condensate is found in four
ways: by considering of V+A polarization operator based on the tau-decay data,
by studying the sum rules for polarization operators momenta in charmonia in
vector, pseudoscalar and axial channels. All of these determinations are in
agreement and result in <(alpha_s/pi)G^2 > =0.005 \pm 0.004 GeV^4. Valence
quark distributions in proton are calculated in QCD using the OPE in proton
current virtuality. The quark distributions agree with those found from the
deep inelastic scattering data. The same value of gluon condensate is favoured.


title: Hunting for the alpha: $B\to \rho\rho$, $B \to \pi\pi$, $B \to\pi\rho$

abstract:
  The hypothesis of the smallness of penguin contribution to charmless
strangeless $B_d (\bar B_d)$ decays allows to determine with high accuracy the
value of angle $\alpha$ from the currently available $B \to \rho\rho$, $B \to
\pi\pi$ and $B\to \rho\pi$ decay data.


title: Pulsar Kicks from Majoron Emission

abstract:
  We show that Majoron emission from a hot nascent neutron star can be
anisotropic in the presence of a strong magnetic field. If Majorons carry a
non-negligible fraction of the supernova energy, the resulting recoil velocity
of a neutron star can explain the observed velocities of pulsars.


title: Phenomenology of a Fluxed MSSM

abstract:
  We analyze the phenomenology of a set of minimal supersymmetric standard
model (MSSM) soft terms inspired by flux-induced supersymmetry (SUSY)-breaking
in Type IIB string orientifolds. The scheme is extremely constrained with
essentially only two free mass parameters: a parameter M, which sets the scale
of soft terms, and the mu parameter. After imposing consistent radiative
electro-weak symmetry breaking (EWSB) the model depends upon one mass parameter
(say, M). In spite of being so constrained one finds consistency with EWSB
conditions. We demonstrate that those conditions have two solutions for mu<0,
and none for mu>0. The parameter tan beta results as a prediction and is
approximately 3-5 for one solution, and 25-40 for the other, depending upon M
and the top mass. We examine further constraints on the model coming from b->s
gamma, the muon g-2, Higgs mass limits and WMAP constraints on dark matter. The
MSSM spectrum is predicted in terms of the single free parameter M. The low tan
beta branch is consistent with a relatively light spectrum although it is
compatible with standard cosmology only if the lightest neutralino is unstable.
The high tan beta branch is compatible with all phenomenological constraints,
but has quite a heavy spectrum. We argue that the fine-tuning associated to
this heavy spectrum would be substantially ameliorated if an additional
relationship mu=-2M were present in the underlying theory.


title: Lepton Flavor Violation within a realistic SO(10)/G(224) Framework

abstract:
  Lepton flavor violation (LFV) is studied within a realistic unified
framework, based on supersymmetric SO(10) or an effective G(224) =
SU(2)_L\times SU(2)_R\times SU(4)^c symmetry, that successfully describes (i)
fermion masses and mixings, (ii) neutrino oscillations, as well as (iii) CP
violation. LFV emerges as an important prediction of this framework, bringing
no new parameters, barring the few SUSY parameters, which are assumed to be
flavor-universal at M^*>= M_{GUT}. We study LFV (i.e. \mu -> e\gamma, \tau ->
\mu\gamma, \tau -> e\gamma and \mu N -> e N) within this framework by including
contributions both from the presence of the right handed neutrinos as well as
those arising from renormalization group running in the post-GUT regime (M^* to
M_{GUT}). Typically the latter, though commonly omitted in the literature, is
found to dominate. Our predicted rates for \mu -> e\gamma show that while some
choices of (m_o, m_{1/2}) are clearly excluded by the current empirical limit,
this decay should be seen with an improvement of the current sensitivity by a
factor of 10--100, even if sleptons are moderately heavy (<= 800 GeV, say). For
the same reason, \mu-e conversion (\mu N -> e N) should show in the planned
MECO experiment. Implications of WMAP and (g-2)_{\mu}-measurements are noted,
as also the significance of the measurement of parity-odd asymmetry in the
decay of polarized \mu^+ into e^+ \gamma.


title:
The WA56 Experiment at CERN: How Does It Look in the Unified Picture for
  Hadron Spectra?

abstract:
  In this note we demonstrate how the experimental material taken from WA56
Experiment at CERN looks in the recently developed unified picture for hadron
spectra. Our analysis shows that baryonium states observed in the WA56
Experiment are the states living in the corresponding KK tower built in
according to the earlier established general, physical law.


title: Geotomography with solar and supernova neutrinos

abstract:
  We show how by studying the Earth matter effect on oscillations of solar and
supernova neutrinos inside the Earth one can in principle reconstruct the
electron number density profile of the Earth. A direct inversion of the
oscillation problem is possible due to the existence of a very simple analytic
formula for the Earth matter effect on oscillations of solar and supernova
neutrinos. From the point of view of the Earth tomography, these oscillations
have a number of advantages over the oscillations of the accelerator or
atmospheric neutrinos, which stem from the fact that solar and supernova
neutrinos are coming to the Earth as mass eigenstates rather than flavour
eigenstates. In particular, this allows reconstruction of density profiles even
over relatively short neutrino path lengths in the Earth, and also of
asymmetric profiles. We study the requirements that future experiments must
meet to achieve a given accuracy of the tomography of the Earth.


title: The Color-Octet Contributions to $P$-wave $B_c$ Meson Hadroproduction

abstract:
  The contributions from the color-octet components $|(c\bar b)_{\bf
8}(^{1}S_{0}) g>$ and $|(c\bar b)_{\bf 8}(^{3}S_{1}) g>$ to the $h_{B_c}$ or
$\chi_{B_c}^J$ (the $P$-wave $B_c$ meson) hadroproduction are estimated in
terms of the complete ${\cal O}(\alpha_s^4)$ calculation. As necessary inputs
in the estimate, we take the values of the octet matrix elements according to
the NRQCD scaling rules, and as a result, we have found that the contributions
to the $P$-wave production may be the same in order of magnitude as those from
the color-singlet ones, $|(c\bar b)_{\bf 1}(^{1}P_{1})>$ and $|(c\bar b)_{\bf
1}(^{3}P_{J})>$ ($J=1,2,3$). Especially, our result indicates that the
observation of the color-octet contributions to the $P$-wave production in the
low transverse momentum region is not very far from the present experimental
capability at Tevatron and LHC.


title:
Small Yukawa Couplings from Type I String Theory and the Inflationary
  Solution to the Strong CP and $\mu$ Problems

abstract:
  We investigate the origin of phenomenologically interesting small Yukawa
couplings in Type I string theory. Utilising the framework of intersecting sets
of D9 and orthogonal D5 branes we demonstrate the connection between extra
dimensional volumes and Yukawa couplings. For example, we show that extra
dimensions with inverse lengths of $10^8$ GeV can lead to $10^{-10}$ Yukawa
couplings. String selection rules, arising from the D-Brane setup, impose
non-trivial constraints on the set of allowed superpotentials. As a
phenomenological application of these results we construct a type I string
model of inflationary particle physics which involves small Yukawa couplings of
order $10^{-10}$, and simultaneously solves the strong CP and $\mu$ problem of
the MSSM, via the vacuum expectation value of the inflaton field.


title: Schemes of Quark Mixings (Oscillations) and Their Mixing Matrices

abstract:
  Three schemes of quark mixings (oscillations) together with their mixing
matrices (analogous to Kabibbo-Kobayashi-Maskawa matrices) are considered. In
these schemes quark transitions are virtual since quark masses are different.
Two of them belong to the so called mass mixing schemes (mixing parameters are
expressed by elements of mass matrices) and the third scheme belongs to the
charge mixings one (mixing parameters are expressed through charges). For these
schemes the expressions for transition probabilities between $d, s, b$ quarks
are obtained. The analysis of situation with the quark mixing parameters in
these schemes is fulfilled.


title: New insight in global QCD fits using Regge theory

abstract:
  In global QCD fits, one has to choose an initial parton distribution at
Q^2=Q_0^2. I shall argue that the initial condition choses in usual standard
sets is inconsistent with analytic S-matrix theory. I shall show how one can
combine these two approaches, leading to a Regge-compatible next-to-leading
order global QCD fit. This allows one to extend the parametrisation in the
low-Q^2 region. Finally, I shall discuss how it it possible to use the
Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equation to obtain
information on Regge models at high Q^2.


title: Taming the B --> X(s) gamma spectrum by Dressed Gluon Exponentiation

abstract:
  We show that the B \to X(s) gamma photon energy (E_gamma) spectrum can be
reliably computed by resummed perturbation theory. Our calculation is based on
Dressed Gluon Exponentiation (DGE) incorporating Sudakov and renormalon
resummation. It is shown that the resummed spectrum does not have the
perturbative support properties: it smoothly extends to the non-perturbative
region E_gamma > m/2, where m is the quark pole mass, and tends to zero near
the physical endpoint. The calculation of the Sudakov factor, which determines
the shape of the spectrum in the peak region, as well as that of the pole mass,
which sets the energy scale, are performed using Principal-Value Borel
summation. By using the same prescription in both, the cancellation of the
leading renormalon ambiguity is respected. Furthermore, in computing the
Sudakov exponent we go beyond the formal next-to-next-to-leading logarithmic
accuracy using the large-order asymptotic behavior of the series, which is
accurately determined from the relation with the pole mass. Upon matching the
resummed result with the next-to-leading order expression we compute the
spectrum, obtain its moments as a function of a minimum photon energy cut,
analyze sources of uncertainty and show that our predictions are in good
agreement with Belle data.


title: Prospects of detecting the QCD critical point

abstract:
  We investigate the possibility to observe the QCD critical point in A+A
collisions at the SPS. Guided by the QCD phase diagram expressed in
experimentally accessible variables we suggest that the process C+C at 158
GeV/n freezes out very close to the critical point. We perform an analysis of
the available preliminary experimental data for a variety of SPS processes. The
basic tool in our efforts is the reconstruction of the critical isoscalar
sector which is formed at the critical point. Our results strongly support our
proposition regarding the C+C system.


title:
Bounds on the Neutrino Mixing Angles and CP Phase for an SO(10) Model
  with Lopsided Mass Matrices

abstract:
  The bounds on the neutrino mixing angles and CP Dirac phase for an SO(10)
model with lopsided mass matrices, arising from the presence of ${\bf 16}_H$
and $\bar{\bf 16}_H$ Higgs representations, are studied by variation of the one
real and three unknown complex input parameters for the right-handed Majorana
neutrino mass matrix. The scatter plots obtained favor nearly maximal
atmospheric neutrino mixing, while the reactor neutrino mixing lies in the
range $10^{-5} \lsim \sin^2 \theta_{13} \lsim 1 \times 10^{-2}$ with values
greater than $10^{-3}$ most densely populated. A rather compelling scenario
within the model follows, if we restrict the three unknown complex parameters
to their imaginary axes and set two of them equal. We then find the scatter
plots are reduced to narrow bands, as the mixing angles and CP phase become
highly correlated and predictive. The bounds on the mixing angles and phase
then become $0.45 \lsim \sin^2 \theta_{23} \lsim 0.55$, $0.38 \lsim \tan^2
\theta_{12} \lsim 0.50$, $0.002 \lsim \sin^2 \theta_{13} \lsim 0.003$, and
$60^\circ \lsim \pm \delta_{CP} \lsim 85^\circ$. Moreover, successful
leptogenesis and subsequent baryogenesis are also obtained, with $\eta_B$
increasing from $(2.7 to 6.3) \times 10^{-10}$ as $\sin^2 \theta_{23}$
increases from 0.45 to 0.55.


title: Deconstructed Higgsless Models with One-Site Delocalization

abstract:
  In this note we calculate the form of electroweak corrections in
deconstructed Higgsless models for the case of a fermion whose weak properties
arise from two adjacent SU(2) groups on the deconstructed lattice. We show
that, as recently proposed in the continuum, it is possible for the value of
the electroweak parameter alpha S to be small in such a model. In addition, by
working in the deconstructed limit, we may directly evaluate the size of
off-Z-pole electroweak corrections arising from the exchange of Kaluza-Klein
modes; this has not been studied in the continuum. The size of these
corrections is summarized by the electroweak parameter alpha delta. In one-site
delocalized Higgsless models with small values of alpha S, we show that the
amount of delocalization is bounded from above, and must be less than 25% at
95% CL. We discuss the relation of these calculations to our previous
calculations in deconstructed Higgsless models, and to models of extended
technicolor. We present numerical results for a four-site model, illustrating
our analytic calculations.


title: Upper Bounds on Lepton-number Violating Processes

abstract:
  We consider four lepton-number violating (\lv) processes: (a) neutrinoless
double-beta decay (0\nu\beta\beta), (b) Delta L = 2 tau decays, (c) Delta L = 2
rare meson decays and (d) nuclear muon-positron conversion. In the absence of
exotic \lv interactions, the rates for these processes are determined by
effective neutrino masses <m>_{\ell_1\ell_2}, which can be related to the sum
of light neutrino masses, the neutrino mass-squared differences, the neutrino
mixing angles, a Dirac phase and two Majorana phases. We sample the
experimentally allowed ranges of <m>_{\ell_1\ell_2} based on neutrino
oscillation experiments as well as cosmological observations, and obtain a
stringent upper bound <m>_{\ell_1\ell_2} \lsim 0.14 eV. We then calculate the
allowed ranges for <m>_{\ell_1\ell_2} from the experimental rates of direct
searches for the above Delta L = 2 processes. Comparing our calculated rates
with the currently or soon available data, we find that only the
$0\nu\beta\beta$ experiment may be able to probe <m>_{ee} with a sensitivity
comparable to the current bound. Muon-positron conversion is next in
sensitivity, while the limits of direct searches for the other Delta L = 2
processes are several orders of magnitude weaker than the current bounds on
<m>_{\ell_1\ell_2}. Any positive signal in those direct searches would indicate
new contributions to the \lv interactions beyond those from three light
Majorana neutrinos.


title: S_3 Flavor Symmetry and Leptogenesis

abstract:
  We consider leptogenesis in a minimal
  S_3 extension of the standard model with an additional Z_2 symmetry in the
leptonic sector. It is found that the CP phase appearing in the neutrino mixing
is the same as that for the CP asymmetries responsible for leptogenesis.
Because of the discrete S_3 x Z_2 flavor symmetries, the CP asymmetries are
strongly suppressed. We therefore assume that the resonant enhancement of the
CP asymmetries takes place to obtain a realistic size of baryon number
asymmetry in theuniverse. Three degenerate right-handed neutrino masses of
O(10) TeV are theoretically expected in this model.


title: Automated computation of one-loop integrals in massless theories

abstract:
  We consider one-loop tensor and scalar integrals, which occur in a massless
quantum field theory and we report on the implementation into a numerical
program of an algorithm for the automated computation of these one-loop
integrals. The number of external legs of the loop integrals is not restricted.
All calculations are done within dimensional regularization.


title: Pulsar kicks via spin-1 color superconductivity

abstract:
  We propose a new neutrino propulsion mechanism for neutron stars which can
lead to strong velocity kicks, needed to explain the observed bimodal velocity
distribution of pulsars. The spatial asymmetry in the neutrino emission is
naturally provided by a stellar core containing spin-1 color-superconducting
quark matter in the A phase. The neutrino propulsion mechanism switches on when
the stellar core temperature drops below the transition temperature of this
phase.


title:
Nuclear size and rapidity dependence of the saturation scale from QCD
  evolution and experimental data

abstract:
  The solutions of the Balitsky-Kovchegov evolution equations are studied
numerically and compared with known analytical estimations. The rapidity and
nuclear size dependences of the saturation scale are obtained for the cases of
fixed and running coupling constant. These same dependences are studied in
experimental data, on lepton-nucleus, deuteron-nucleus and nucleus-nucleus
collisions, through geometric scaling and compared with the theoretical
calculations.


title:
Two-loop scalar self-energies and pole masses in a general
  renormalizable theory with massless gauge bosons

abstract:
  I present the two-loop self-energy functions for scalar bosons in a general
renormalizable theory, within the approximation that vector bosons are treated
as massless or equivalently that gauge symmetries are unbroken. This enables
the computation of the two-loop physical pole masses of scalar particles in
that approximation. The calculations are done simultaneously in the
mass-independent \bar{MS}, \bar{DR}, and \bar{DR}' renormalization schemes, and
with arbitrary covariant gauge fixing. As an example, I present the two-loop
SUSYQCD corrections to squark masses, which can increase the known one-loop
results by of order one percent. More generally, it is now straightforward to
implement all two-loop sfermion pole mass computations in supersymmetry using
the results given here, neglecting only the electroweak vector boson masses
compared to the superpartner masses in the two-loop parts.


title: Leptogenesis as the origin of matter

abstract:
  We explore in some detail the hypothesis that the generation of a primordial
lepton-antilepton asymmetry (Leptogenesis) early on in the history of the
Universe is the root cause for the origin of matter. After explaining the
theoretical conditions for producing a matter-antimatter asymmetry in the
Universe we detail how, through sphaleron processes, it is possible to
transmute a lepton asymmetry -- or, more precisely, a (B-L)-asymmetry -- into a
baryon asymmetry. Because Leptogenesis depends in detail on properties of the
neutrino spectrum, we review briefly existing experimental information on
neutrinos as well as the seesaw mechanism, which offers a theoretical
understanding of why neutrinos are so light. The bulk of the review is devoted
to a discussion of thermal Leptogenesis and we show that for the neutrino
spectrum suggested by oscillation experiments one obtains the observed value
for the baryon to photon density ratio in the Universe, independently of any
initial boundary conditions. In the latter part of the review we consider how
well Leptogenesis fits with particle physics models of dark matter. Although
axionic dark matter and Leptogenesis can be very naturally linked, there is a
potential clash between Leptogenesis and models of supersymmetric dark matter
because the high temperature needed for Leptogenesis leads to an overproduction
of gravitinos, which alter the standard predictions of Big Bang
Nucleosynthesis. This problem can be resolved, but it constrains the
supersymmetric spectrum at low energies and the nature of the lightest
supersymmetric particle (LSP). Finally, as an illustration of possible other
options for the origin of matter, we discuss the possibility that Leptogenesis
may occur as a result of non-thermal processes.


title:
Unitarity triangle test of the extra factor of two in particle
  oscillation phases

abstract:
  There are claims in the literature that in neutrino oscillations and
oscillations of neutral kaons and B-mesons the oscillation phase differs from
the standard one by a factor of two. We reconsider the arguments leading to
this extra factor and investigate, in particular, the non-relativistic regime.
We actually find that the very same arguments lead to an ambiguous phase and
that the extra factor of two is a special case. We demonstrate that the
unitarity triangle (UT) fit in the Standard Model with three families is a
suitable means to discriminate between the standard oscillation phase and the
phase with an extra factor of two. If $K_L - K_S$ and $B_{dH} - B_{dL}$ mass
differences are extracted from the $K^0 - \bar K^0$ and $B_d^0 - \bar B_d^0$
data, respectively, with the extra factor of two in the oscillation phases,
then the UT fit becomes significantly worse in comparison with the standard fit
and the extra factor of two is disfavoured by the existing data at the level of
more than 3 $\sigma$.


title: Non local lagrangians(I): the pion

abstract:
  We define a family of non local and chirally symmetric low energy lagrangians
motivated by theoretical studies on Quantum Chromodynamics. These models lead
to quark propagators with non trivial momentum dependencies. We define the
formalism for two body bound states and apply it to the pion. We study the
coupling of the photon and W bosons with special attention to the
implementation of local gauge invariance. We calculate the pion decay constant
recovering the Goldberger-Treiman and the Gell-Mann-Oakes-Renner relations. We
recover a form of the axial current consistent with PCAC. Finally we study the
pion form factor and we construct the operators involved in its parton
distribution.


title: Density perturbations from both the inflaton and the curvaton

abstract:
  We consider a supersymmetric grand unified model which leads to hybrid
inflation and solves the strong CP and mu problems via a Peccei-Quinn symmetry,
with the Peccei-Quinn field acting as a curvaton generating together with the
inflaton the curvature perturbation. The model yields an isocurvature
perturbation too of mixed correlation with the adiabatic one. Two choices of
parameters are confronted with the Wilkinson microwave anisotropy probe and
other cosmic microwave background radiation data. For the choice giving the
best fitting, the curvaton contribution to the amplitude of the adiabatic
perturbation must be smaller than 67% at 95% confidence level and the best-fit
power spectra are dominated by the adiabatic inflaton contribution. This case
is disfavored relative to the pure inflaton scale-invariant case with odds of
50 to 1. For the second choice, the adiabatic mode is dominated by the
curvaton, but this case is strongly disfavored relative to the pure inflaton
case (with odds of 10^7 to 1). Thus, in this model, the perturbations must be
dominated by the adiabatic component from the inflaton.


title: Quark-model study of few-baryon systems

abstract:
  We review the application of non-relativistic constituent quark models to
study one, two and three non-strange baryon systems. We present results for the
baryon spectra, potentials and observables of the NN, N$\Delta$, $\Delta\Delta$
and NN$^*(1440)$ systems, and also for the binding energies of three
non-strange baryon systems. We make emphasis on observable effects related to
quark antisymmetry and its interplay with quark dynamics.


title: From Entropy and Jet Quenching to Deconfinement?

abstract:
  The challenge of demonstrating that the matter produced in heavy ion
collisions is a deconfined quark-gluon plasma, as predicted by lattice QCD
calculations, is the challenge of measuring the number of thermodynamic degrees
of freedom \nu ~ \epsilon/T^4 at the time t0 at which the matter comes into
approximate local thermal equilibrium and begins to behave like a hydrodynamic
fluid. Data from experiments done at the Relativistic Heavy Ion Collider have
been used to estimate t0 and to put a lower bound on the energy density
\epsilon(t0). However, measuring \nu has seemed out of reach, because no
current data serve even as qualitative proxies for the temperature T(t0). We
point out that \nu may equally appropriately be defined via \nu ~s^4/epsilon^3,
where s is the entropy density, which can be estimated from the measured final
state entropy. This estimate is based on the testable assumption of an
isentropic expansion. The observation of jet quenching has the potential to
provide an upper bound on the energy density at early times. Our goal is to
motivate such an analysis by pointing out that it would set a lower bound on
\nu.


title: Little Technicolor

abstract:
  Inspired by the AdS/CFT correspondence, we show that any G/H symmetry
breaking pattern can be described by a simple two-site moose diagram. This
construction trivially reproduces the CCWZ prescription in the context of
Hidden Local Symmetry. We interpret this moose in a novel way to show that many
little Higgs theories can emerge from ordinary chiral symmetry breaking in
scaled-up QCD. We apply this reasoning to the simple group little Higgs to see
that the same low energy degrees of freedom can arise from a variety of UV
complete theories. We also show how models of holographic composite Higgs
bosons can turn into brane-localized little technicolor theories by
"integrating in" the IR brane.


title: Models of Neutrino Mass with a Low Cutoff Scale

abstract:
  In theories with a low quantum gravity scale, global symmetries are expected
to be violated, inducing excessive proton decay or large Majorana neutrino
masses. The simplest cure is to impose discrete gauge symmetries, which in turn
make neutrinos massless. We construct models that employ these gauge symmetries
while naturally generating small neutrino masses. Majorana (Dirac) neutrino
masses are generated through the breaking of a discrete (continuous) gauge
symmetry at low energies, e.g., 2 keV to 1 GeV. The Majorana case predicts
\Delta N_\nu \simeq 1 at BBN, neutrinoless double beta decay with scalar
emission, and modifications to the CMB anisotropies from domain walls in the
universe as well as providing a possible Dark Energy candidate. For the Dirac
case, despite the presence of a new light gauge boson, all laboratory,
astrophysical, and cosmological constraints can be avoided.


title: Inflating with the QCD Axion

abstract:
  We show that the QCD axion can drive inflation via a series of tunneling
events. For axion models with a softly broken $Z_N$ symmetry, the axion
potential has a series of $N$ local minima and may be modeled by a tilted
cosine. Chain inflation results along this tilted cosine: the field tunnels
from an initial minimum near the top of the potential through a series of ever
lower minima to the bottom. This results in sufficient inflation and reheating.
QCD axions, potentially detectable in current searches, may thus simultaneously
solve problems in particle physics and provide inflation.


title: Scales of Mass Generation for Quarks, Leptons and Majorana Neutrinos

abstract:
  We study 2 --> n inelastic fermion-(anti)fermion scattering into multiple
longitudinal weak gauge bosons and derive universal upper bounds on the scales
of fermion mass generation by imposing unitarity of the S-matrix. We place new
upper limits on the scales of fermion mass generation, independent of the
electroweak symmetry breaking scale. We find that the strongest 2 --> n limits
fall in a narrow range, 3-170 TeV (with n=2-24), depending on the observed
fermion masses.


title:
Search for the vector-like top quark $T$ at the future linac-ring type
  $ep$ collider

abstract:
  The little Higgs models typically contain a new vector-like top quark $T$,
which plays a key role in breaking the electroweak symmetry. In the context of
the littlest Higgs (LH) model, we study single production of this kind of new
particle via the process $ep\to eb\to \nu_{e}T$ in the future linac-ring type
$ep$ collider (LC$\bigotimes LHC$). We find that the production cross section
is in the range of $1.2\times 10^{-4}$-- 0.48 $pb$ at the $LC\bigotimes LHC$
with $\sqrt{s}=3.7$ $TeV$.


title: The statistical parton distributions: status and prospects

abstract:
  New experimental results on polarized structure functions, cross sections for
$e^{\pm}p$ neutral and charge current reactions and $\nu$ ($\bar{\nu}$) charge
current on isoscalar targets are compared with predictions using the
statistical parton distributions, which were previously determined. New data on
cross sections for Drell-Yan processes, single jet in $p\bar{p}$ collisions and
inclusive $\pi^0$ production in $pp$ collisions are also compared with
predictions from this theoretical approach. The good agreement which we find
with all these tests against experiment, strenghtens our opinion on the
relevance of the role of quantum statistics for parton distributions. We will
also discuss the prospects of this physical framework.


title: Two predictive supersymmetric S3 x Z2 models for the quark mass matrices

abstract:
  We propose two simple models for the quark mass matrices which may be
implemented through an S3 x Z2 symmetry in a supersymmetric context. Each model
has eight parameters and, therefore, makes two independent predictions for the
quark mixing matrix. The first model predicts |Vub / Vcb| approx sqrt{m_u /
m_c} sim 0.06 and |Vtd / Vts| approx sqrt{m_d / m_s} sim 0.23. The second
model, in which the forms of the up-type-quark and down-type-quark mass
matrices are interchanged relative to the first one, predicts |Vub / Vcb| sim
0.11 and |Vtd / Vts| sim 0.33. Both models have sin(2 beta) sim 0.5.


title: Little Higgs Review

abstract:
  Recently there has been renewed interest in the possibility that the Higgs
particle of the Standard Model is a pseudo-Nambu-Goldstone boson. This
development was spurred by the observation that if certain global symmetries
are broken only by the interplay between two or more coupling constants, then
the Higgs mass-squared is free from quadratic divergences at one loop. This
"collective symmetry" breaking is the essential ingredient in little Higgs
theories, which are weakly coupled extensions of the Standard Model with little
or no fine tuning, describing physics up to an energy scale ~10 TeV. Here we
give a pedagogical introduction to little Higgs theories. We review their
structure and phenomenology, focusing mainly on the SU(3) theory, the Minimal
Moose, and the Littlest Higgs as concrete examples.


title: Constraining gamma from K* pi and rho K Decays

abstract:
  We show that information on the weak phase gamma can be extracted from the K*
pi and rho K decays. Less hadronic uncertainty is involved when the observables
of four of these modes are combined together. We further point out two
approximate relations in these decay modes can help determine whether there are
new physics contributions in Delta I = 1 transitions, as hinted in the K pi
modes.


title:
On the inclusive gluon jet production off the nucleus in the
  perturbative QCD

abstract:
  In the perturbative QCD approach single and double inclusive cross-sections
for gluon production off the nucleus are studied from the relevant reggeized
gluon diagrams. Various terms corresponding to emission of gluons from the
triple Pomeron vertex are found. Among them the term derived by Kovchegov and
Tuchin emerges as a result of transition from the diffractive to effective
high-energy vertex. However it does not exhaust all the vertex contributions to
the inclusive cross-section. In the double inclusive cross-section a
contribution violating naive AGK rules is found, in which one gluon is emitted
from the vertex and the other from one of the Pomerons below the vertex. But
then this contribution is subdominant at high energies and taking it into
account seems to be questionable.


title: Modified Boltzmann Transport Equation

abstract:
  Recently several works have appeared in the literature in which authors try
to describe Freeze Out (FO) in energetic heavy ion collisions based on the
Boltzmann Transport Equation (BTE). The aim of this work is to point out the
limitations of the BTE, when applied for the modeling of FO or other very fast
process, and to propose the way how the BTE approach can be generalized for
such a processes.


title: Unstable particle's wave-function renormalization prescription

abstract:
  We strictly define two set Wave-function Renormalization Constants (WRC)
under the LSZ reduction formula for unstable particles at the first time. Then
by introducing antiparticle's WRC and the CPT conservation law we obtain a new
wave-function renormalization condition which can be used to totally determine
the two set WRC. We calculate two physical processes to manifest the
consistence of the present wave-function renormalization prescription with the
gauge theory in standard model. We also prove that the conventional
wave-function renormalization prescription which discards the imaginary part of
unstable particle's WRC leads to physical amplitude gauge dependent.


title: A scale-invariant "discrete-time" Balitsky Kovchegov equation

abstract:
  We consider a version of QCD dipole cascading corresponding to a finite
number n of discrete steps Delta Y of branching in rapidity. The discretization
scheme preserving the holomorphic factorizability and scale-invariance in
position space of the dipole splitting function, we derive an exact recurrence
formula from step to step which plays the role of a ``discrete-time''
Balitsky-Kovchegov equation. The BK solutions are recovered in the limit
n=infinity and Delta Y=0.


title:
Fragmentation Functions for Light Charged Hadrons with Complete Quark
  Flavour Separation

abstract:
  We present new sets of next-to-leading order fragmentation functions
describing the production of charged pions, kaons and protons from the gluon
and from each of the quarks, obtained by fitting to all relevant data sets from
e+ e- annihilation. The individual light quark flavour fragmentation functions
are obtained phenomenologically for the first time by including in the data the
light quark tagging probabilities obtained by the OPAL Collaboration.


title: Flavour and polarisation in heavy neutrino production at e+ e- colliders

abstract:
  We analyse l W nu production at ILC, paying special attention to the role of
the final lepton flavour and beam polarisation in the search for a new heavy
neutrino N. We show that a sizeable coupling to the electron V_eN ~ 10^-2 is
necessary to have an observable signal in any of the channels, despite the fact
that the signal may be more visible in muon or tau final states. The
non-observation of a heavy neutrino at ILC will improve the present upper bound
on its mixing with the electron by more than one order of magnitude, V_eN <
0.007 for m_N between 200 and 400 GeV.


title: The Color Glass Condensate: an overview

abstract:
  The Color Glass Condensate is a theory of the dynamical properties of partons
in the Regge limit of QCD: x_{\rm Bj}\to 0$, $Q^2 >> \Lambda_{\rm QCD}^2={\rm
fixed} and the center of mass energy squared s\to \infty. We provide a brief
introduction to the theoretical ideas underlying the Color Glass Condensate and
discuss the application of these ideas to high energy scattering in QCD.


title:
Rare t-quark decays $t \to c l_j^{+} l_k^{-}$, $t \to c \tilde{\nu_j}
  \nu_k$ in the minimal four color symmetry model

abstract:
  The rare t-quark decays $t \to c l_j^{+} l_k^{-}$, $t \to c \tilde{\nu_j}
\nu_k$ via the scalar leptoquark doublets are investigated in the minimal four
color symmetry model with the Higgs mechanism of the quark-lepton mass
splitting. The partial widths of these decays are calculated and the total
width of the charged lepton mode $ \Gamma(t \to c {l^{+}}' l^{-})= \sum_{j,k}
\Gamma(t \to c l_{j}^{+} l_{k}^{-})$ and the total width of the neutrino mode $
\Gamma(t \to c \tilde{\nu}' \nu)= \sum_{j,k} \Gamma(t \to c \tilde{\nu_{j}}
\nu_{k})$ are found. The corresponding branching ratios are shown to be $ Br(t
\to c {l^{+}}' l^{-}) \approx (3.5 - 0.4) 10^{-5}, $ $ Br(t \to c
{\tilde{\nu}}' \nu) \approx (7.1 - 0.8) 10^{-5} $ for the scalar leptoquark
masses $ m_{S}= 180 - 250 GeV $ and for the appropriate values $ (\sin{\beta}
\approx 0.2) $ of the mixing angle of the model. The search for such decays at
LHC may be of interest.


title: Scale dependence of the UHECR neutrino flux in extra-dimension models

abstract:
  Ultra high energy cosmic ray (UHECR) neutrino fluxes measured in a fixed
target detector can have a scale dependence. In the usual standard model or any
extensions of this model (which are renormalizable), the effect is
observationally very small. However, this need not be the case in models with
extra-spatial dimensions, where the neutrino mass parameter can receive large
corrections due to a power-law running. Hence, the scale dependence may lead to
a measurable deviation from the standard prediction for the neutrino flux
ratio.


title: Exotic Baryons in Two-Dimensional QCD

abstract:
  Two-dimensional QCD has often been used as a laboratory for studying the full
four-dimensional theory, providing, for example, an explicit realization of
baryons as solitons. We review aspects of conventional baryons in
two-dimensional QCD, including the classical and quantum contributions to their
masses. We then discuss the spectrum of exotic baryons in two-dimensional QCD,
commenting on the solitonic radius inferred from the excitation spectrum as
well as the two-dimensional version of the Goldberger-Treiman relation relating
meson couplings to current matrix elements. Two-dimensional QCD provides strong
overall support to the chiral-soliton picture for the structure of normal and
exotic baryons in four dimensions.


title: Collinear Subtractions in Hadroproduction of Heavy Quarks

abstract:
  We present a detailed discussion of the collinear subtraction terms needed to
establish a massive variable-flavour-number scheme for the one-particle
inclusive production of heavy quarks in hadronic collisions. The subtraction
terms are computed by convoluting appropriate partonic cross sections with
perturbative parton distribution and fragmentation functions relying on the
method of mass factorization. We find (with one minor exception) complete
agreement with the subtraction terms obtained in a previous publication by
comparing the zero-mass limit of a fixed-order calculation with the genuine
massles results in the MSbar scheme. This presentation will be useful for
extending the massive variable-flavour-number scheme to other processes.


title:
Associated production of A^0 and Z^0 bosons and Rare Pseudoscalar Higgs
  Decays

abstract:
  We study the production of a pseudoscalar Higgs boson A^0 in association with
a Z^0 boson at a future international linear collider (ILC). We consider the
contributions to this process at the one loop level in the Minimal
Supersymmetric Standard Model (MSSM) from top and bottom quarks as well as stop
and sbottom squarks. We also study the squark contributions to the decay widths
of the pseudoscalar Higgs boson for the decays A^0 --> \gamma Z^0$ and A^0 -->
Z^0 Z^0. The contribution from the supersymmetric loops are found to be
directly proportional to the squark mixing and potentially large due to the
massive pseudoscalar Higgs coupling to squarks.


title: Solar mass-varying neutrino oscillations

abstract:
  We propose that the solar neutrino deficit may be due to oscillations of
mass-varying neutrinos (MaVaNs). This scenario elucidates solar neutrino data
beautifully while remaining comfortably compatible with atmospheric neutrino
and K2K data and with reactor antineutrino data at short and long baselines
(from CHOOZ and KamLAND). We find that the survival probability of solar MaVaNs
is independent of how the suppression of neutrino mass caused by the
acceleron-matter couplings varies with density. Measurements of MeV and lower
energy solar neutrinos will provide a rigorous test of the idea.

categories: hep-ph astro-ph gr-qc hep-ex nucl-ex nucl-th


title:
New allowed mSUGRA parameter space from variations of the trilinear
  scalar coupling A0

abstract:
  In minimal Supergravity (mSUGRA) models the lightest supersymmetric particle
(assumed to be the lightest neutralino) provides an excellent cold dark matter
(CDM) candidate. The supersymmetric parameter space is significantly reduced,
if the limits on the CDM relic density, obtained from WMAP data, are used.
Assuming a vanishing trilinear scalar coupling A0 and fixed values of
tan(beta), these limits result in narrow lines of allowed regions in the
m0-m1/2 plane, the so called WMAP strips. In this analysis the trilinear
coupling A0 has been varied within +/-4 TeV. A fixed non vanishing A0 value
leads to a shift of the WMAP strips in the m0-m1/2 plane.


title: Quark Number Susceptibilities & The Wroblewski Parameter

abstract:
  The Wroblewski parameter is a convenient indicator of strangeness production
and can be employed to monitor a signal of quark-gluon plasma production :
enhancement of strangeness production. It has been shown to be about a factor
two higher in heavy ion collisions than in hadronic collisions. Using a method
proposed by us earlier, we obtained lattice QCD results for the Wroblewski
parameter from our simulations of QCD with two light quarks both below and
above the chiral transition. Our first principles based and parameter free
result compare well with the A-A data from SPS and RHIC.


title: Analyticity and the $N_c$ counting rule of $S$ matrix poles

abstract:
  By studying $\pi\pi$ scattering amplitudes in the large $N_c$ limit, we
clarify the $N_c$ dependence of the $S$ matrix pole position. It is
demonstrated that analyticity and the $N_c$ counting rule exclude the existence
of $S$ matrix poles with ${\cal M}, \Gamma\sim O(1)$. Especially the properties
of $\sigma$ and $f_0(980)$ with respect to the $1/N_c$ expansion are discussed.
We point out that in general tetra-quark resonances do not exist.


title: An Interesting Fitting of Quark Masses

abstract:
  In this note we show an empirical formula of quark masses, which is found by
implementing a least squares fit. In this formula the measured QCD coupling is
almost a "best fitting coupling".


title:
Origin of magnetic field in compact stars and magnetic properties of
  quark matter

abstract:
  Microscopic origin of the magnetic field observed in compact stars is studied
in quark matter. Spontaneous spin polarization appears in high-density region
due to the Fock exchange term. On the other hand, quark matter becomes unstable
to form spin density wave in the moderate density region, where restoration of
chiral symmetry plays an important role. Coexistence of the magnetism and color
superconductivity is briefly discussed.


title: Symmetric reggeon interaction in perturbative QCD

abstract:
  Integral kernels describing the pair interaction of reggeized gluons and
quarks are reconstructed in terms of conformal symmetric 4-point functions in
the transverse plane of impact parameters.


title: QCD Predictions for Charm and Bottom Production at RHIC

abstract:
  We make up-to-date QCD predictions for open charm and bottom production at
RHIC in nucleon-nucleon collisions at \sqrt{S} = 200 GeV. We also calculate the
electron spectrum resulting from heavy flavor decays to allow direct comparison
to the data. A rigorous benchmark, including the theoretical uncertainties, is
established against which nuclear collision data can be compared to obtain
evidence for nuclear effects.


title: Quark production in high energy proton-nucleus collisions

abstract:
  In this note, we discuss the problem of quark-antiquark pair production in
the framework of the color glass condensate. The cross-section can be
calculated in closed form for the case of proton-nucleus collisions, where the
proton can be considered to be a dilute object. We find that kt-factorization
is broken by rescattering effects.


title: Some Relations between Hadron Masses

abstract:
  The mass of some hadrons are reproduced in terms of the mass of the nucleon.
A possible reason for emission of soft gammas is proposed.


title: The mass gap and gluon confinement

abstract:
  In our previous publication [1-3] it has been proven that the general
iteration solution of the Shwinger-Dyson equation for the full gluon propagator
(i.e., when the skeleton loop integrals, contributing into the gluon
self-energy, have to be iterated, which means that no any
truncations/approximations have been made) can be algebraically (i.e., exactly)
decomposed as the sum of the two principally different terms. The first term is
the Laurent expansion in integer powers of severe (i.e., more singular than
$1/q^2$) infrared singularities accompanied by the corresponding powers of the
mass gap and multiplied by the corresponding residues. The standard second term
is always as much singular as $1/q^2$ and otherwise remaining undetermined.
Here it is explicitly shown that the infrared renormalization of the mass gap
only is needed to render theory free of all severe infrared singularities in
the gluon sector. Moreover, this leads to the gluon confinement criterion in a
gauge-invariant way. As a result of the infrared renormalization of the mass
gap in the initial Laurent expansion, that is dimensionally regularized, the
simplest severe infrared singularity $(q^2)^{-2}$ survives only. It is
multiplied by the mass gap squared, which is the scale responsible for the
large scale structure of the true QCD vacuum. The $\delta$-type regularization
of the simplest severe infrared singularity (and its generalization for the
multi-loop skeleton integrals) is provided by the dimensional regularization
method correctly implemented into the theory of distributions. This makes it
possible to formulate exactly and explicitly the full gluon propagator (up to
its unimportant perturbative part).


title: Parton Propagation in a Gluon Field

abstract:
  The phenomenological success of PQCD is based on processes where the effects
of the color field environment on parton propagation can be eliminated or is
universal. In hard diffraction and quarkonium production the PQCD subprocess is
the same as in fully inclusive scattering, but the sensitivity to
reinteractions is different. I discuss how this may be exploited to give new
information on the dynamics of hard collisions.


title: Quark Coalescence and Charm(onium) in QGP

abstract:
  The potential of heavy quarks as probes of the environment produced in
hadronic and heavy-ion reactions is discussed. A key role is played by
coalescence processes and/or resonance formation which are promising candidates
to provide a comprehensive understanding of phenomena associated with
reinteractions of both open and hidden heavy-quark states.


title: Playing with fermion couplings in Higgsless models

abstract:
  We discuss the fermion couplings in a four dimensional SU(2) linear moose
model by allowing for direct couplings between the left-handed fermions on the
boundary and the gauge fields in the internal sites. This is realized by means
of a product of non linear $\sigma$-model scalar fields which, in the continuum
limit, is equivalent to a Wilson line. The effect of these new non local
couplings is a contribution to the $\epsilon_3$ parameter which can be of
opposite sign with respect to the one coming from the gauge fields along the
string. Therefore, with some fine tuning, it is possible to satisfy the
constraints from the electroweak data.


title:
Generalized Dirac-Pauli equation and spin light of neutrino in
  magnetized matter

abstract:
  We consider propagation of a massive neutrino in matter within the quantum
approach based on the two equations for the neutrino field: the first one is
the Dirac-Pauli equation for a massive neutrino in an external magnetic field
generalized on the inclusion of effects of the background matter; the second
one is the modified Dirac equation derived directly from the neutrino-matter
interaction Lagrangian. On the basis of these two equations the quantum theory
of a neutrino moving in the background matter is developed (the exact solutions
of these equations are found and classified over the neutrino spin states, the
corresponding energy spectra are also derived). Using these solutions we study
within the quantum approach the spin light of neutrino ($SL\nu$) in matter with
the effect of a longitudinal magnetic field being also incorporated. In
particular, the $SL\nu$ radiation rate and total power are derived. The use of
the generalized Dirac-Pauli equation also enables us to consider the $SL\nu$ in
matter polarized under the influence of strong magnetic field.


title: Neutralino Dark Matter from Heavy Gravitino Decay

abstract:
  We propose a new scenario of non-thermal production of neutralino cold dark
matter, in which the overproduction problem of lightest supersymmetric
particles (LSPs) in the standard thermal history is naturally solved. The
mechanism requires a heavy modulus field which decays mainly to ordinary
particles releasing large entropy to dilute gravitinos produced just after
inflation and thermal relics of LSPs. Significant amount of gravitinos are also
pair-produced at the decay, which subsequently decay into the neutralinos. We
identify the regions of the parameter space in which the requisite abundance of
the neutralino dark matter is obtained without spoiling the big-bang
nucleosynthesis by injection of hadronic showers from gravitino decay. The
neutralino abundance obtained in this mechanism is insensitive to the details
of the superparticle mass spectrum, unlike the standard thermal abundance. We
also briefly mention the testability of the scenario in future experiments.


title: A Determination of the Lambda Parameter from Full Lattice QCD

abstract:
  We present a determination of the QCD parameter Lambda in the quenched
approximation (n_f=0) and for two flavours (n_f=2) of light dynamical quarks.
The calculations are performed on the lattice using O(a) improved Wilson
fermions and include taking the continuum limit. We find Lambda_{n_f=0} =
259(1)(20) MeV and Lambda_{n_f=2} = 261(17)(26) MeV}, using r_0 = 0.467 fm to
set the scale. Extrapolating our results to five flavours, we obtain for the
running coupling constant at the mass of the Z boson alpha_s(m_Z) =
0.112(1)(2). All numbers refer to the MSbar scheme.


title: Structure of split supersymmetry and simple models

abstract:
  We derive in detail a condition on the Higgs mass parameters that is
necessary for the recently proposed ``split supersymmetry''
  (split SUSY) scenario to provide a realistic magnitude of $\tan \beta$. The
nature of this condition can be understood by showing how the Higgs sector of
the minimal supersymmetric Standard Model reduces to that of the Standard Model
in the heavy limit of the soft supersymmetry breaking
  Higgs mass parameters. Based on this condition, we present some simple
supersymmetry breaking models that each provides a realistic split-SUSY mass
spectrum, in accordance with the scale of the gravitino mass ($m_{3/2}$) in
relation to those of the soft scalar mass ($\tilde{m}$) and the gaugino mass
($M_{1/2}$) employed in each, namely $m_{3/2} \geq \tilde{m}$, $\tilde{m} \geq
m_{3/2} \geq M_{1/2}$ and $M_{1/2} \geq m_{3/2}$, respectively, with the
relation $\tilde{m} \gg M_{1/2}$ of the split-SUSY mass spectrum.


title: Pair Production of Charged Higgs Bosons from Bottom-Quark Fusion

abstract:
  For very large values of $\tan\beta$, charged Higgs boson pair production at
the Large Hadron Collider (LHC) from the scattering of two bottom quarks can
proceed dominantly. We investigated the cross sections of charged Higgs boson
pair production via the subprocess $b\bar{b} \to H^+H^-$ at the LHC including
the next-to-leading order (NLO) QCD corrections in the minimal supersymmetric
standard model (MSSM). We find that the NLO QCD corrections can significantly
reduce the dependence of the cross sections on the renormalization and
factorization scales.


title: Sfermion production at a Linear Collider at one-loop

abstract:
  We present the complete one-loop corrections to the sfermion pair production
process e+e- -> sf_i sf_j (f = t, b, tau, nu_tau, u, d, s, c) in the Minimal
Supersymmetric Standard Model. Our results also include the previously
calculated SUSY-QCD corrections. We present some details of the renormalization
scheme used. It is found that the weak corrections are of the same magnitude as
the SUSY-QCD corrections at higher energies (sqrt(s) ~ 1 Tev). At these
energies an important part of the weak corrections stems from the box
contribution. We also include cross-sections for polarized beams and left-right
asymmetry.


title: Hadron-quark matter phase transition in neutron stars

abstract:
  A structured mixed phase consisting of quark and hadron phases is numerically
studied with the Coulomb screening effect and the surface effect. We carefully
introduced the Coulomb potential, so that a geometrical structure becomes
mechanically unstable when the surface tension is large. Charge densities are
largely rearranged by the screening effect, and thereby the equation of state
shows the similar behavior to that given by the Maxwell construction.
Therefore, although bulk calculations with the Gibbs conditions show that the
mixed phase may exist in a wide density region, we can see it is restricted to
a narrow density region by the surface effect and the Coulomb screening effect.


title:
Restoration of U$_A$(1) symmetry and meson spectrum in hot or dense
  matter

abstract:
  We explore the effects of breaking and restoration of chiral and axial
symmetries using an extended three-flavor Nambu-Jona-Lasinio model that
incorporates explicitly the axial anomaly through the 't Hooft interaction. We
implement a temperature (density) dependence of the anomaly coefficient
motivated by lattice results for the topological susceptibility. The spectrum
of scalar and pseudoscalar mesons is analyzed bearing in mind the
identification of chiral partners and the study of its convergence. We also
concentrate on the behavior of the mixing angles that give us relevant
information on the issue under discussion. The results suggest that the axial
part of the symmetry is restored before the possible restoration of the full
U(3)$\otimes$U(3) chiral symmetry might occur.


title: Multiple photon corrections to the neutral-current Drell-Yan process

abstract:
  Precision studies of single W and Z production processes at hadron colliders
require progress in the calculation of electroweak radiative corrections. To
this end, higher-order QED corrections to the neutral-current Drell-Yan
process, due to multiple photon radiation in Z leptonic decays, are calculated.
Particular attention is paid to the effects induced by such corrections on the
experimental observables which are relevant for high-precision measurements of
the W-boson mass at the Tevatron Run II and the LHC. The calculation is
implemented in the Monte Carlo event generator HORACE, which is available for
data analysis.


title:
Study of the leptonic decays of pseudoscalar $B, D$ and vector $B^*,
  D^*$ mesons and of the semileptonic $B\to D$ and $B\to D^*$ decays

abstract:
  We present results for different observables in weak decays of pseudoscalar
and vector mesons with a heavy $c$ or $b$ quark. The calculations are done in a
nonrelativistic constituent quark model improved at some instances by heavy
quark effective theory constraints. We determine pseudoscalar and vector meson
decay constants that within a few per cent satisfy $f_V M_V/f_P M_P=1$, a
result expected in heavy quark symmetry when the heavy quark masses tend to
infinity. We also analyze the semileptonic $B\to D$ and $B\to D^*$ decays for
which we evaluate the different form factors. Here we impose heavy quark
effective theory constraints among form factors that are not satisfied by a
direct quark model calculation. The value of the form factors at zero recoil
allows us to determine, by comparison with experimental data, the value of the
$|V_{cb}|$ Cabbibo-Kobayashi-Maskawa matrix element. From the $B\to D$
semileptonic decay we get $|V_{cb}|=0.040\pm0.006$ in perfect agreement with
our previous determination based on the study of the semileptonic $\Lambda_b\to
\Lambda_c$ decay and also in excellent agreement with a recent experimental
determination by the DELPHI Collaboration. We further make use of the partial
conservation of axial current hypothesis to determine the strong coupling
constants $g_{B^*B\pi}(0)=60.5\pm 1.1$ and $g_{D^*D\pi}(0)=22.1\pm0.4$. The
ratio $R=(g_{B^*B\pi}(0) f_{B^*}\sqrt{M_D})/ (g_{D^*D\pi}(0)
f_{D^*}\sqrt{M_B})=1.105\pm0.005$ agrees with the heavy quark symmetry
prediction of 1.


title:
The role of dissipation in biasing the vacuum selection in quantum field
  theory at finite temperature

abstract:
  We study the symmetry breaking pattern of an O(4) symmetric model of scalar
fields, with both charged and neutral fields, interacting with a photon bath.
Nagasawa and Brandenberger argued that in favourable circumstances the vacuum
manifold would be reduced from S^3 to S^1. Here it is shown that a selective
condensation of the neutral fields, that are not directly coupled to photons,
can be achieved in the presence of a minimal ``external'' dissipation, i.e. not
related to interactions with a bath. This should be relevant in the early
universe or in heavy-ion collisions where dissipation occurs due to expansion.


title:
Duality and Pomeron effective theory for QCD at high energy and large
  N_c

abstract:
  We propose an effective theory which governs Pomeron dynamics in QCD at high
energy, in the leading logarithmic approximation, and in the limit where N_c,
the number of colors, is large. In spite of its remarkably simple structure,
this effective theory generates precisely the evolution equations for
scattering amplitudes that have been recently deduced from a more complete
microscopic analysis. It accounts for the BFKL evolution of the Pomerons
together with their interactions: dissociation (one Pomeron splitting into two)
and recombination (two Pomerons merging into one). It is constructed by
exploiting a duality principle relating the evolutions in the target and the
projectile, more precisely, splitting and merging processes, or fluctuations in
the dilute regime and saturation effects in the dense regime. The simplest
Pomeron loop calculated with the effective theory is free of both ultraviolet
or infrared singularities.


title: Top Compositeness and Precision Unification

abstract:
  The evolution of Standard Model gauge couplings is studied in a
non-supersymmetric scenario in which the hierarchy problem is resolved by Higgs
compositeness above the weak scale. It is argued that massiveness of the top
quark combined with precision tests of the bottom quark imply that the
right-handed top must also be composite. If, further, the Standard Model gauge
symmetry is embedded into a simple subgroup of the unbroken composite-sector
flavor symmetry, then precision coupling unification is shown to occur
at~10^{15} GeV, to a degree comparable to supersymmetric unification.


title:
Physics Reach of High-Energy and High-Statistics IceCube Atmospheric
  Neutrino Data

abstract:
  This paper investigates the physics reach of the IceCube neutrino detector
when it will have collected a data set of order one million atmospheric
neutrinos with energies in the 0.1 \sim 10^4 TeV range. The paper consists of
three parts. We first demonstrate how to simulate the detector performance
using relatively simple analytic methods. Because of the high energies of the
neutrinos, their oscillations, propagation in the Earth and regeneration due to
\tau decay must be treated in a coherent way. We set up the formalism to do
this and discuss the implications. In a final section we apply the methods
developed to evaluate the potential of IceCube to study new physics beyond
neutrino oscillations. Not surprisingly, because of the increased energy and
statistics over present experiments, existing bounds on violations of the
equivalence principle and of Lorentz invariance can be improved by over two
orders of magnitude. The methods developed can be readily applied to other
non-conventional physics associated with neutrinos.


title: Study of multiparticle production by Gluon Dominance Model

abstract:
  The gluon dominance model offers a description of multiparticle production in
e^+e- - annihilation and proton-proton collisions. The multiplicity
distributions in e^+e^- annihilation are well described. The energy dependence
of model parameters gives the dynamic parton stage and hadronisation picture.
It is shown that this model has confirmed oscillations in sign of the ratio of
factorial cumulant moments over factorial moments of the increasing order. The
collective behavior of secondary particles in $pp$-interactions at 70 GeV/c is
studied in the project "Thermalization". An active role of gluons is shown in
the multiparticle dynamics. This paper gives a simple thermodynamic
interpretation of interactions mentioned above.


title:
The $s\bar s$ component of the proton and the strangeness magnetic
  moment

abstract:
  A complete analysis is given of the implications of the empirical indications
for a positive strangeness magnetic moment $\mu_s$ of the proton on the
possible configurations of the $uuds\bar s$ component of the proton. A positive
value for $\mu_s$ is obtained in the $s\bar s$ configuration where the $uuds$
subsystem is in an orbitally excited state with $[4]_{[FS]}[22]_F[22]_S$
flavor-spin symmetry, which is likely to have the lowest energy. The
configurations in which the $\bar s$ is orbitally excited, which include the
conventional $K^+\Lambda^0$ configuration, with exception of that in which the
$uuds$ component has spin 2, yield negative values for $\mu_s$. The hidden
strangeness analogues of recently proposed quark cluster models for the
$\theta^+$ pentaquark give differing signs for $\mu_s$.


title:
Matching of Singly- and Doubly-Unresolved Limits of Tree-level QCD
  Squared Matrix Elements

abstract:
  We describe how to disentangle the singly- and doubly-unresolved (soft and/or
collinear) limits of tree-level QCD squared matrix elements. Using the
factorization formulae presented in this paper, we outline a viable general
subtraction scheme for computing next-to-next-to-leading order corrections for
electron-positron annihilation into jets.