title:
Relation between CKM and MNS Matrices Induced by Bi-Maximal Rotations in
  the Seesaw Mechanism

abstract:
  It is found that the seesaw mechanism not only explains the smallness of
neutrino masses but also accounts for the large mixing angles simultaneously,
even if the unification of the neutrino Dirac mass matrix with that of up-type
quark sector is realized. In this mechanism, we show that the mixing matrix of
the Dirac-type mass matrix gets extra rotations from the diagonalization of
Majorana mass matrix. Assuming that the mixing angles to diagonalize the
Majorana mass matrix are extremely small, we find that the large mixing angles
of leptonic sector found in atmospheric and long baseline reactor neutrino
oscillation experiments can be explained by these extra rotations. We also find
that provided the mixing angle around y-axis to diagonalize the Majorana mass
matrix vanishes, we can derive the information about the absolute values of
neutrino masses and Majorana mass responsible for the neutrinoless double beta
decay experiment through the data set of neutrino experiments. In the
simplified case that there is no CP phase, we find that the neutrino masses are
decided as $m_1:m_2:m_3\approx 1:2:8$ and that there are no solution which
satisfy $m_3<m_1<m_2$ (inverted mass spectrum). Then, including all CP phases,
we reanalyze the absolute values of neutrino masses and Majorana mass
responsible for the neutrinoless double beta decay experiment.


title: SU(3)_C X SU(3)_L X U(1)_X model with two Higgs triplets

abstract:
  The $SU(3)_C X SU(3)_L X U(1)_X$ gauge model with the minimal scalar sector
(two Higgs triplets) is studied in detail. One of the vacuum expectation values
$u$ is a source of lepton-number violations and a reason for the mixing among
the charged gauge bosons - the standard model $W$ and the bilepton (with L=2)
gauge bosons as well as among neutral non-Hermitian $X^0$ and neutral gauge
bosons: the photon, the $Z$ and the new $Z'$. Because of these mixings, the
lepton-number violating interactions exist in both charged and neutral gauge
boson sectors. An exact diagonalization of the neutral gauge boson sector is
derived and bilepton mass splitting is also given. The lepton-number violation
happens only in the neutrino but not in the charged lepton sector. In this
model, lepton-number changing ($\Delta L = \pm 2$) processes exist but "only"
in the neutrino sector. Constraints on VEVs of the model are estimated and $u
\simeq \emph{O}(1) \textrm{GeV}$, $v \simeq v_{weak} = 246 \textrm{GeV}$ and
$\om \simeq \emph{O}(1) \textrm{TeV}$.


title:
Curvaton Scenario in the Presence of Two Dilatons Coupled to the Scalar
  Curvature

abstract:
  The possibility of the realization of a curvaton scenario is studied in a
theory in which two dilatons are introduced along with coupling to the scalar
curvature. It is shown that when the two dilatons have an approximate O(2)
symmetric coupling, a scalar field playing the role of the curvaton may exist
in the framework of this theory without introducing any other scalar field for
the curvaton. Thus the curvaton scenario can be realized, and in the simple
version of the curvaton scenario, in which the curvaton potential is quadratic,
the curvature perturbation with a sufficient amplitude and a nearly
scale-invariant spectrum suggested by observations obtained from WMAP can be
generated.


title: Borel resummation of soft gluon radiation and higher twists

abstract:
  We show that the well-known divergence of the perturbative expansion of
resummed results for processes such as deep-inelastic scattering and Drell-Yan
in the soft limit can be treated by Borel resummation. The divergence in the
Borel inversion can be removed by the inclusion of suitable higher twist terms.
This provides us with an alternative to the standard 'minimal prescription' for
the asymptotic summation of the perturbative expansion, and it gives us some
handle on the role of higher twist corrections in the soft resummation region.


title: All Order Running Coupling BFKL Evolution from GLAP (and vice-versa)

abstract:
  We present a systematic formalism for the derivation of the kernel of the
BFKL equation from that of the GLAP equation and conversely to any given order,
with full inclusion of the running of the coupling. The running coupling is
treated as an operator, reducing the inclusion of running coupling effects and
their factorization to a purely algebraic problem. We show how the GLAP
anomalous dimensions which resum large logs of x can be derived from the
running-coupling BFKL kernel order by order, thereby obtaining a constructive
all-order proof of small x factorization. We check this result by explicitly
calculating the running coupling contributions to GLAP anomalous dimensions up
to next-to-next-to leading order. We finally derive an explicit expression for
BFKL kernels which resum large logs of Q^2 up to next-to-leading order from the
corresponding GLAP kernels, thus making possible a consistent collinear
improvement of the BFKL equation up to the same order.


title: An approach for evaluation of observables in analytic versions of QCD

abstract:
  We present two variants of an approach for evaluation of observables in
analytic QCD models. The approach is motivated by the skeleton expansion in a
certain class of schemes. We then evaluate the Adler function at low energies
in one variant of this approach, in various analytic QCD models for the
coupling parameter, and compare with perturbative QCD predictions and the
experimental results. We introduce two analytic QCD models for the coupling
parameter which reproduce the measured value of the semihadronic tau decay
ratio. Further, we evaluate the Bjorken polarized sum rule at low energies in
both variants of the evaluation approach, using for the coupling parameter the
analytic QCD model of Shirkov and Solovtsov, and compare with values obtained
by the evaluation approach of Milton et al. and Shirkov.


title:
Pseudoscalar Meson Decay Constants and Couplings, the Witten-Veneziano
  Formula beyond large N_c, and the Topological Susceptibility

abstract:
  The QCD formulae for the radiative decays $\eta,\eta'\to\c\c$, and the
corresponding Dashen--Gell-Mann--Oakes--Renner relations, differ from
conventional PCAC results due to the gluonic $U(1)_A$ axial anomaly. This
introduces a critical dependence on the gluon topological susceptibility. In
this paper, we revisit our earlier theoretical analysis of radiative
pseudoscalar decays and the DGMOR relations and extract explicit experimental
values for the decay constants. This is our main result. The flavour singlet
DGMOR relation is the generalisation of the Witten-Veneziano formula beyond
large $N_c$, so we are able to give a quantitative assessment of the
realisation of the $1/N_c$ expansion in the $U(1)_A$ sector of QCD.
Applications to other aspects of $\eta'$ physics, including the relation with
the first moment sum rule for the polarised photon structure function $g_1^\c$,
are highlighted. The $U(1)_A$ Goldberger-Treiman relation is extended to
accommodate SU(3) flavour breaking and the implications of a more precise
measurement of the $\eta$ and $\eta'$-nucleon couplings are discussed. A
comparison with the existing literature on pseudoscalar meson decay constants
using large-$N_c$ chiral Lagrangians is also made.


title: Chiral approach to phi radiative decays

abstract:
  The radiative decays of the phi meson are known to be a good source of
information about the a0(980) and f0(980) scalar mesons. We discuss these
decays starting from a non-linear model Lagrangian which maintains the (broken)
chiral symmetry for the pseudoscalar (P), scalar (S) and vector (V) nonets
involved. The characteristic feature is derivative coupling for the SPP
interaction. In an initial approximation which models all the scalar nonet
radiative processes together with the help of a point like vertex, it is noted
that the derivative coupling prevents the a0 and f0 resonance peaks from
getting washed out (by falling phase space). However, the shapes of the two
final PP mass distributions do not agree well with the experimental ones. For
improving the situation we verify that the inclusion of the charged K meson
loop diagrams in the model does reproduce the experimental spectrum shapes in
the resonance region. The derivative coupling introduces quadratic as well as
logaritmic divergneces in this calculation. Using dimensional regularization we
show that these divergences actually cancel out among the four diagrams, as
expected from gauge invariance. We point out the features which are expected to
be important for further work on this model and for learning more about the
puzzling scalar mesons.


title: Classical Cancellation of the Cosmological Constant Re-Considered

abstract:
  We revisit a scenario in which the cosmological constant is cancelled by the
potential energy of a slowly evolving scalar field, or "cosmon". The cosmon's
evolution is tied to the cosmological constant by a feedback mechanism. This
feedback is achieved by an unconventional coupling of the cosmon field to the
Ricci curvature scalar. The solutions show that the effective cosmological
constant evolves approximately as $t^{-2}$ and remains always of the same order
as the density of ordinary matter and radiation. Newton's constant varies on
cosmological time scales, with $\dot{G}_N/G_N \ll 1/t$. $G_N$ could have been
somewhat different, and possibly smaller, at the time of Big Bang
nucleosynthesis.


title:
The diffuse neutrino flux from supernovae: upper limit on the electron
  neutrino component from the non-observation of antineutrinos at
  SuperKamiokande

abstract:
  I derive an upper bound on the electron neutrino component of the diffuse
supernova neutrino flux from the constraint on the antineutrino component at
SuperKamiokande. The connection between antineutrino and neutrino channels is
due to the similarity of the muon and tau neutrino and antineutrino fluxes
produced in a supernova, and to the conversion of these species into electron
neutrinos and antineutrinos inside the star. The limit on the electron neutrino
flux is 5.5 cm^-2 s^-1 above 19.3 MeV of neutrino energy, and is stronger than
the direct limit from Mont Blanc by three orders of magnitude. It represents
the minimal sensitivity required at future direct searches, and is intriguingly
close to the reach of the Sudbury Neutrino Observatory (SNO) and of the ICARUS
experiment. The electron neutrino flux will have a lower bound if the electron
antineutrino flux is measured. Indicatively, the first can be smaller than the
second at most by a factor of 2-3 depending on the details of the neutrino
spectra at production.


title:
Thermal unpairing transitions affected by neutrality constraints and
  chiral dynamics

abstract:
  We discuss the phase structure of homogeneous quark matter under the charge
neutrality constraints, and present a unified picture of the thermal unpairing
phase transitions for a wide range of the quark density. We supplement our
discussions by developing the Ginzburg-Landau analysis.


title: New Parametrizations for the Photon Structure Function

abstract:
  In the last year four new parametrizations of the Hadronic Photon Structure
Function at Next to Leading Order have appeared. In this talk, I briefly review
the main features of three of them: the FFNS_CJK, CJK and AFG.


title:
Confinement- Deconfinement Phase Transition and Fractional Instanton
  Quarks in Dense Matter

abstract:
  We present arguments suggesting that large size overlapping instantons are
the driving mechanism of the confinement-deconfinement phase transition at
nonzero chemical potential mu. The arguments are based on the picture that
instantons at very large chemical potential in the weak coupling regime are
localized configurations with finite size \rho\sim\mu^{-1}. At the same time,
the same instantons at smaller chemical potential in the strong coupling regime
are well represented by the so-called instanton-quarks with fractional
topological charge 1/N_c. We estimate the critical chemical potential mu_c(T)
where transition between these two regimes takes place. We identify this
transition with confinement- deconfinement phase transition.
  We also argue that the instanton quarks carry magnetic charges. As a
consequence of it, there is a relation between our picture and the standard
t'Hooft and Mandelstam picture of the confinement. We also comment on possible
relations of instanton-quarks with "periodic instantons", " center vortices",
and "fractional instantons" in the brane construction. We also argue that the
variation of the external parameter mu, which plays the role of the vacuum
expectation value of a "Higgs" field at mu >> \Lambda_{QCD}, allows to study
the transition from a "Higgs -like" gauge theory (weak coupling regime, mu>>
\Lambda_{QCD}) to ordinary QCD (strong coupling regime, mu<< \Lambda_{QCD}). We
also comment on some recent lattice results on topological charge density
distribution which support our picture.


title:
Associated production of the top-pions and single top at hadron
  colliders

abstract:
  In the context of topcolor assisted technicolor(TC2) models, we study the
production of the top-pions $\pi_{t}^{0,\pm}$ with single top quark via the
processes $p\bar{p} \to t\pi_{t}^{0}+X$ and $p\bar{p} \to t\pi_{t}^{\pm}+X$,
and discuss the possibility of detecting these new particles at Tevatron and
LHC. We find that it is very difficult to observe the signals of these
particles via these processes at Tevatron, while the neutral and charged
top-pions $\pi_{t}^{0}$ and $\pi_{t}^{\pm}$ can be detecting via considering
the same sign top pair $tt\bar{c}$ event and the $tt\bar{b}$ (or $t\bar{t}b$)
event at LHC, respectively.


title:
Solution of polarised singlet DGLAP evolution equations by the method of
  characteristics

abstract:
  Polarised singlet DGLAP equations are solved by applying the method of
characteristics. The singlet equations are first transformed into a pair of
coupled partial differential equations by a Taylor series expansion valid to be
at small x. The equations are then reduced to canonical forms and the resultant
equations solved by applying the method of characteristics. Results are
compared with some exact solutions of polarised DGLAP equations available in
the literature.


title: Axial form-factor and induced pseudoscalar form-factor of the nucleons

abstract:
  In this article, we calculate the axial and the induced pseudoscalar
form-factors $G_A(t=-Q^2)$ and $G_P(t=-Q^2)$ of the nucleons in the framework
of the light-cone QCD sum-rules approach up to twist-6 three valence quark
light-cone distribution amplitudes, and observe that the form-factors
$G_A(t=-Q^2)$ and $G_P(t=-Q^2)$ at intermediate and large momentum transfers
with $Q^2> 2 GeV^2$ have significant contributions from the end-point (soft)
terms. The numerical values for the axial form-factor $G_A(t=-Q^2)$ are
compatible with the experimental data and theoretical calculations, for
example, the chiral quark models and lattice QCD. The numerical values for the
induced pseudoscalar form-factor $G_P(t=-Q^2)$ are compatible with the
calculation from the Bethe-Salpeter equation.


title:
The implications of final L3 measurement of
  $\sigma_{tot}(\gamma\gamma\to b\bar{b}

abstract:
  he excess of data on the total cross section of $\bar{b}b$ production in
$\gamma\gamma$ collisions over QCD predictions, observed by L3, OPAL and DELPHI
Collaborations at LEP2, has so far defied explanation. The recent final
analysis of L3 data has brought important new information concerning the
dependence of the observed excess on the $\gamma\gamma$ collisions energy
$W_{\gamma\gamma}$. The implications of this dependence are discussed.


title: Towards e+e- --> 3 jets at NNLO by sector decomposition

abstract:
  A method based on sector decomposition has been developed to calculate the
double real radiation part of the process e+e- to 3 jets at
next-to-next-to-leading order. It is shown in an example that the numerical
cancellation of soft and collinear poles works well. The method is flexible to
include an arbitrary measurement function in the final Monte Carlo program,
such that it allows to obtain differential distributions for different kinds of
observables. This is demonstrated by showing 3-, 4- and 5-jet rates at order
alpha_s^3 for a subpart of the process.


title: Weak boson fusion production of supersymmetric particles at the LHC

abstract:
  We present a complete calculation of weak boson fusion production of
colorless supersymmetric particles at the LHC, using the new matrix element
generator SUSY-MadGraph. The cross sections are small, generally at the
attobarn level, with a few notable exceptions which might provide additional
supersymmetric parameter measurements. We discuss in detail how to consistently
define supersymmetric weak couplings to preserve unitarity of weak gauge boson
scattering amplitudes to fermions, and derive sum rules for weak supersymmetric
couplings.


title:
On The Direct Detection of Dark Matter- Exploring all the signatures of
  the neutralino-nucleus interaction

abstract:
  Various issues related to the direct detection of supersymmetric dark matter
are reviewed. Such are: 1) Construction of supersymmetric models with a number
of parameters, which are constrained from the data at low energies as well as
cosmological observations. 2) A model for the nucleon, in particular the
dependence on the nucleon cross section on quarks other than u and d. 3) A
nuclear model, i.e. the nuclear form factor for the scalar interaction and the
spin response function for the axial current. 4) Information about the density
and the velocity distribution of the neutralino (halo model). Using the present
experimental limits on the rates and proper inputs in 3)-4) we derive
constraints in the nucleon cross section, which involves 1)-2). Since the
expected event rates are extremely low we consider some additional signatures
of the neutralino nucleus interaction, such as the periodic behavior of the
rates due to the motion of Earth (modulation effect), which, unfortunately, is
characterized by a small amplitude. This leads us to examine the possibility of
suggesting directional experiments, which measure not only the energy of the
recoiling nuclei but their direction as well. In these, albeit hard,
experiments one can exploit two very characteristic signatures: a)large
asymmetries and b) interesting modulation patterns. Furthermore we extended our
study to include evaluation of the rates for other than recoil searches such
as: i) Transitions to excited states, ii) Detection of recoiling electrons
produced during the neutralino-nucleus interaction and iii) Observation of hard
X-rays following the de-excitation of the ionized atom.


title: Microscopic origin of the magnetic field in compact stars

abstract:
  A magnetic aspect of quark matter is studied by the Fermi liquid theory. The
magnetic susceptibility is derived with the one-gluon-exchange interaction, and
the critical Fermi momentum for spontaneous spin polarization is found to be
1.4fm^{-1}. A scenario about the origin of the magnetic field in compact stars
is presented by using this result.


title:
U(1)_A Topological Susceptibility and its Slope, Pseudoscalar Gluonium
  and the Spin of the Proton

abstract:
  We review the determinations of the pseudoscalar glueball and eventual radial
excitation of the \eta' masses and decay constants from QCD spectral sum rules
(QSSR). The glueball mass is (2.05+-0.19) which one can compare with the
eventual experimental candidate X(1835), while the \eta(1400) is likely a
radial excitation of the \eta'-meson. Their effects on the estimates of U(1)_A
topological susceptibility and its slope as well as the impact of the latter in
the estimate of the spin of the proton is discussed. We predict the singlet
polarized parton distributions to be a^0(Q^2=4 GeV^2)=0.32+-0.02, which is
about a factor two smaller than the OZI value, but comparable with the COMPASS
measurement of 0.24+-0.02.


title: Thermal background can solve the cosmological moduli problem

abstract:
  It is shown that the coherent field oscillation of moduli fields with weak or
TeV scale masses can dissipate its energy efficiently if they have a derivative
coupling to standard bosonic fields in a thermal state. This mechanism may
provide a new solution to the cosmological moduli problem in some special
situations.


title: Soft gluon emission at large angles

abstract: I review recent results on soft gluon radiation at large angles


title:
NLO supersymmetric QCD corrections to the $t \bar b H^-$ associated
  production at hadron colliders

abstract:
  We present the next-to-leading order QCD corrected total cross sections and
the distributions of the transverse momenta of the final anti-bottom-quark,
top-quark and charged Higgs-boson for the processes of $p\bar p/pp \to t\bar b
H^-+X$ in the minimal supersymmetric standard model(MSSM) at the Tevatron and
the LHC. We find that the NLO QCD corrections significantly modify the
leading-order distributions of the transverse momenta of final
particles($p_T^b$, $p_T^t$ and $p_T^{H^-}$), and the total NLO QCD corrections
reduce the dependence of the cross section on the renormalization and
factorization scales, especially the NLO QCD corrected cross sections at the
LHC are nearly independent of these scales. Our results show that the relative
correction is obviously related to $m_{H^-}$ and $\tan\beta$, and the total NLO
QCD relative corrections can be beyond -50% at the Tevatron and approach -40%
at the LHC in our chosen parameter space.


title: A possible nuclear effect on the NuTeV sin^2 theta_W anomaly

abstract:
  We investigate a possible explanation for the NuTeV anomaly in terms of a
nuclear correction difference between u_v and d_v distributions. Analyzing deep
elastic scattering and Drell-Yan data for nuclear targets, we try to determine
the correction difference and its effect on the anomaly. We find that the
difference cannot be precisely determined at this stage due to the lack of data
which are sensitive to the difference. Therefore, it is difficult to draw a
solid conclusion about its effect although the anomaly could be explained, at
least partially, by this kind of nuclear correction.


title: Interacting Rarita--Schwinger Field and its Spin-Parity Content

abstract:
  We obtain in analytical form the dressed propagator of the massive
Rarita-Schwinger field and discuss its properties. The calculation of the
self-energy contributions demonstrates that besides $s=3/2$ component the
Rarita-Schwinger field contains also two $s=1/2$ components of opposite parity.


title:
Double diffractive meson production and the BFKL Pomeron at $e^+e^-$
  colliders

abstract:
  In this Letter we study the double diffractive vector meson production in
$e^+e^-$ collisions assuming the dominance of the BFKL pomeron exchange. We
consider the non-forward solution of the BFKL equation at high energy and large
momentum transfer and estimate the total cross section for the process $e^+e^-
\to e^+e^- V_1 V_2$ with antitagged $e^+$ and $e^-$, where $V_1$ and $V_2$ can
be any two vector mesons ($V_i = \rho, \omega, \phi, J/\Psi, \Upsilon$). The
event rates for the future linear colliders are given.


title: Isolated Photons in Deep Inelastic Scattering

abstract:
  Photon radiation at large transverse momenta at colliders is a detailed probe
of hard interaction dynamics. The isolated photon production cross section in
deep inelastic scattering was measured recently by the ZEUS experiment, and
found to be considerably larger than theoretical predictions obtained with
widely used event generators. To investigate this discrepancy, we perform a
dedicated parton-level calculation of this observable, including contributions
from fragmentation and large-angle radiation. Our results are in good agreement
with all aspects of the experimental measurement.


title:
Stationary phase corrections in the process of bosonization of
  multi-quark interactions

abstract:
  The functional integration over the auxiliary bosonic variables of cubic
order related with the effective action of the Nambu -- Jona-Lasinio model with
't Hooft term has recently been obtained in the form of a loop expansion. Even
numbers of loops contribute to the action, while odd numbers of loops are
assigned to the measure. We consider the two-loop corrections and analyse their
effect on the low-lying pseudoscalar and scalar mass spectra, quark condensates
and weak decay constants. The results are compared to the leading order
calculations and other approaches.


title:
Hard pion and prompt photon at RHIC, from single to double inclusive
  production

abstract:
  Single pion and prompt photon large transverse momentum spectra in p-p and
Au-Au collisions are computed in perturbative QCD at RHIC energy, s^1/2 = 200
GeV. Next-to-leading order calculations are discussed and compared with p-p
scattering data. Subsequently, quenching factors are computed to leading order
for both pions and photons within the same energy loss model. The good
agreement with PHENIX preliminary data allows for a lower estimate of the
energy density reached in central Au-Au collisions, epsilon > 10 GeV/fm^3.
Double inclusive photon-pion production in p-p and Au-Au collisions is then
addressed. Next-to-leading order corrections prove rather small in p-p
scattering. In Au-Au collisions, the quenching of momentum-correlation spectra
is seen to be sensitive to parton energy loss processes, which would help to
understand how the fragmentation dynamics is modified in nuclear collisions at
RHIC.


title: On the Observation of Vacuum Birefringence

abstract:
  We suggest an experiment to observe vacuum birefringence induced by intense
laser fields. A high-intensity laser pulse is focused to ultra-relativistic
intensity and polarizes the vacuum which then acts like a birefringent medium.
The latter is probed by a linearly polarized x-ray pulse. We calculate the
resulting ellipticity signal within strong-field QED assuming Gaussian beams.
The laser technology required for detecting the signal will be available within
the next three years.


title: Appearance of quark-hadron duality in the Rein-Sehgal model

abstract:
  Quark-hadron duality in neutrino-nucleon reactions is investigated under the
assumption that cross sections in the resonance region are given by the
Rein-Sehgal model. The quantitative analysis of the duality is done by means of
appropriate integrals of the structure functions in the Nachtmann variable. We
conclude that with the definition of the resonance region $W\in (M+m_{\pi}, 2$
GeV) the duality holds for neutrino-proton reaction $F_2$ structure function
for $Q^2\in (0.5, 3)$ GeV$^2$ and it is absent for neutrino-neutron reaction.


title:
Strong flavour changing effective operator contributions to single top
  quark production

abstract:
  We study the effects of dimension six effective operators on the production
of single top quarks at the LHC. The operator set considered includes terms
with effective gluon interactions and four-fermion terms. Analytic expressions
for the several partonic cross sections of single top production will be
presented, as well as the results of their integration on the parton density
functions.


title: Recoilless Resonant Capture of Antineutrinos from Tritium Decay

abstract:
  Monoenergetic antineutrinos emitted in the bound state beta-decay of H can be
resonantly captured in 3He. Favorable conditions are offered by tritide
technology for ultra sharp recoilless resonant capture of the 18.6 keV nubare
with sigma~5x10-32 cm2, 11 orders of magnitude larger than sigma(nubare +p).
The gravitational red shift of neutrinos and the mixing angle theta13 may be
measurable in bench scale baselines.


title: F_D-Term Hybrid Inflation with Electroweak-Scale Lepton Number Violation

abstract:
  We study F-term hybrid inflation in a novel supersymmetric extension of the
SM with a subdominant Fayet-Iliopoulos D-term. We call this particular form of
inflation, in short, F_D-term hybrid inflation. The proposed model ties the
mu-parameter of the MSSM to an SO(3)-symmetric Majorana mass m_N, through the
vacuum expectation value of the inflaton field. The late decays of the
ultraheavy particles associated with the extra U(1) gauge group, which are
abundantly produced during the preheating epoch, could lower the reheat
temperature even up to 1 TeV, thereby avoiding the gravitino overproduction
problem. The baryon asymmetry in the Universe can be explained by thermal
electroweak-scale resonant leptogenesis, in a way independent of any
pre-existing lepton- or baryon-number abundance. Further cosmological and
particle-physics implications of the F_D-term hybrid model are briefly
discussed.


title:
Radiative Corrections to Low-Energy Neutrino-Deuteron Reactions
  Revisited

abstract:
  The one-loop QED and electroweak radiative corrections to neutrino-deuteron
scattering induced by the neutral current are reexamined, paying a particular
attention to the constant term which has never been treated properly in
literature. This problem is closely related to the definition of the
axial-vector coupling constant $g_{A}$ and requires thorough calculations of
the constant terms in the charged current processes, too. We find that the
radiative corrections to the neutral current induced reactions amount to 1.7
(1.5) per cent enhancement, if the Higgs boson mass is $m_{H}=1.5 \: m_{Z}
(m_{H}=5.0 \: m_{Z})$ This number happens to be close to that given by Kurylov
et al., but we argue that this is accidental.


title: The pi pi Phase Shifts from psi' to J/psi pi^+ pi^- Decays

abstract:
  The $\psi'\to J/\psi\pi^+\pi^-$ decay process provides a new way to extract
the $\pi\pi$ $S$ wave phase shifts up to $0.59GeV$. In this paper we derive the
formulae for extracting the $\pi\pi$ $S$ wave phase shifts from the invariant
mass spectrum of $\pi\pi$ in the $\psi'\to J/\psi\pi^+\pi^-$ decay.


title: Flavour Issues in Leptogenesis

abstract:
  We study the impact of flavour in thermal leptogenesis, including the quantum
oscillations of the asymmetries in lepton flavour space. In the Boltzmann
equations we find different numerical factors and additional terms which can
affect the results significantly. The upper bound on the CP asymmetry in a
specific flavour is weaker than the bound on the sum. This suggests that --
when flavour dynamics is included -- there is no model-independent limit on the
light neutrino mass scale,and that the lower bound on the reheat temperature is
relaxed by a factor ~ (3 - 10).


title: The importance of flavor in leptogenesis

abstract:
  We study leptogenesis from the out-of-equilibrium decays of the lightest
heavy neutrino $N_1$ in the medium (low) temperature regime, $T\lsim 10^{12}$
GeV ($10^{10}$ GeV), where the rates of processes mediated by the $\tau$ (and
$\mu$) Yukawa coupling are non negligible, implying that the effects of lepton
flavors must be taken into account. We find important quantitative and
qualitative differences with respect to the case where flavor effects are
ignored: (i) The cosmic baryon asymmetry can be enhanced by up to one order of
magnitude; (ii) The sign of the asymmetry can be opposite to what one would
predict from the sign of the total lepton asymmetry $\epsilon_1$; (iii)
Successful leptogenesis is possible even with $\epsilon_1=0$.


title: Techniques for one-loop tensor integrals in many-particle processes

abstract:
  We briefly sketch the methods for a numerically stable evaluation of tensor
one-loop integrals that have been used in the calculation of the complete
electroweak one-loop corrections to $\Pep\Pem\to4 $fermions. In particular, the
improvement of the new methods over the conventional Passarino--Veltman
reduction is illustrated for some 4-point integrals in the delicate limits of
small Gram (and other kinematical) determinants.


title:
Operator Relations for SU(3) Breaking Contributions to K and K*
  Distribution Amplitudes

abstract:
  We derive constraints on the asymmetry a1 of the momentum fractions carried
by quark and antiquark in K and K* mesons in leading twist. These constraints
follow from exact operator identities and relate a1 to SU(3) breaking
quark-antiquark-gluon matrix elements which we determine from QCD sum rules.
Comparing our results to determinations of a1 from QCD sum rules based on
correlation functions of quark currents, we find that, for a1^\parallel(K*) the
central values agree well and come with moderate errors, whereas for a1(K) and
a1^\perp(K*) the results from operator relations are consistent with those from
quark current sum rules, but come with larger uncertainties. The consistency of
results confirms that the QCD sum rule method is indeed suitable for the
calculation of a1. We conclude that the presently most accurate predictions for
a1 come from the direct determination from QCD sum rules based on correlation
functions of quark currents and are given by: a1(K) = 0.06\pm 0.03,
a1^\parallel(K*) = 0.03\pm 0.02, a1^\perp(K*) = 0.04\pm 0.03.


title:
Global analysis of AAC for determining polarized parton distribution
  functions

abstract:
  We report global analysis results for polarized parton distribution functions
in the nucleon. The optimum distributions are determined by using spin
asymmetry data on polarized lepton scattering on proton, neutron, and deuteron.
Their uncertainties are estimated by the Hessian method. As a result, polarized
quark distributions are relatively well determined, whereas the polarized gluon
distribution has a large uncertainty band. We find that the obtained gluon
distribution is compatible with recent \Delta g/g measurements in high-p_T
hadron productions.


title:
Vacuum Polarization Effects in the Worldline Variational Approach to
  Quantum Field Theory

abstract:
  The worldline variational approach is extended beyond the quenched
approximation, i.e. to include virtual pair production of heavy particles. This
is achieved either by an expansion of the functional determinant to second
order or by an hybrid ansatz for the quadratic trial action consisting of
fields for the light particles and worldlines for the heavy ones as in the
linear polaron model. Numerical results and analytic approximations show a
reduction of radiative effects with increasing number of flavors.


title:
Naturalness Priors and Fits to the Constrained Minimal Supersymmetric
  Standard Model

abstract:
  We examine the effect of a prior that favours low values of fine-tuning on
Bayesian multi-dimensional fits of the constrained minimal supersymmetric
standard model (CMSSM or mSUGRA) to current data. The dark matter relic
density, the anomalous magnetic moment of the muon and the branching ratio of
b->s gamma are all used to constrain the model via a Markov Chain Monte Carlo
sampler. As a result of the naturalness prior, posterior probability
distributions skew towards lighter higgs and sparticle masses, the effect being
most pronounced in the gaugino sector. Interestingly, slepton masses are an
exception and skew towards heavier masses. The lightest CP-even Higgs h^0-pole
region becomes allowed at the 2 sigma level for the latest combination of
measurements of m_t=172.7+/-2.9 GeV, provided we allow for a theoretical error
in the prediction of its mass m_{h^0}. m_{h^0} is constrained to be less than
120 GeV at the 95% C.L. Probing the branching ratio of B_s->mu^+ mu^- to the
level of 2 x 10^{-8}, as might be achieved by the Tevatron experiments, would
cover 32% of the probability density, irrespective of which of the two priors
is used.


title: Dark matter pair-production in b -> s transitions

abstract:
  The flavour-changing neutral current transition b \to s can serve as a
sensitive probe of WIMP dark matter models, if the WIMP mass is under 2 GeV. In
this work we extend our earlier analysis to a generic class of models where the
interaction between the dark matter sector and the Standard Model matter sector
is mediated by the Higgs boson(s). We show that experimental limits on the
decays of B-mesons to K(K^*) and missing energy provide stringent constraints
on the parameter space of such models, but do not rule out sub-GeV WIMPs in a
model-independent way. We find that in the context of the NMSSM with light
pseudoscalar Higgs, the WIMP masses under a few hundred MeV are generically
excluded with the exception of few highly tuned points in the parameter space.


title: A Lithium Experiment in the Program of Solar Neutrino Research

abstract:
  The experiments sensitive to pp-neutrinos from the Sun are very perspective
for the precise measurement of a mixing angle $\theta_{12}$. A $\nu $e$^{-}$
scattering experiment (Xmass) and/or a charged-current experiment (the indium
detector) can measure the flux of electron pp-neutrinos. One can find the total
flux of pp-neutrinos from a luminosity constraint after the contribution of
$^7$Be and CNO neutrinos to the total luminosity of the Sun are measured. The
radiochemical experiment utilizing a lithium target has the high sensitivity to
the CNO neutrinos, thus, it has a good promise for the precise measurement of a
mixing angle and for the test of a current theory of the evolution of the
stars.


title:
Thermal Operator Representation of Finite-Temperature Amplitudes in the
  Presence of Chemical Potential

abstract:
  In a recent paper [Phys. Rev. D {\bf 72}, 085006 (2005)], Brandt {\em et al}.
deduced the thermal operator representation for a thermal $N$-point amplitude,
both in the imaginary-time and real-time formalisms. In the case when a
chemical potential present, however, the representation is not as simple as in
the case with vanishing chemical potential. We propose a much simpler and
transparent representation for the case of non-zero chemical potential.


title: Supernova Detection via a Network of Neutral Current Spherical TPC's

abstract:
  The coherent contribution of all neutrons in neutrino nucleus scattering due
to the neutral current offers a realistic prospect of detecting supernova
neutrinos. For a typical supernova at 10 kpc, about 1000 events are expected
using a spherical gaseous detector of radius 4 m and employing Xe gas at a
pressure of 10 Atm. We propose a world wide network of several such simple,
stable and low cost supernova detectors with a running time of a few centuries.


title: Higgs--mediated K -> pi nu nu-bar in the MSSM at large tan(beta)

abstract:
  We analyze the impact of Higgs-mediated amplitudes on the rare decays KL ->
pi0 nu nu-bar and K+ -> pi+ nu nu-bar in the MSSM with large tan(beta) and
general flavour mixing. We point out that, going beyond the minimal flavour
violation hypothesis, Z-penguin amplitudes generated by charged-Higgs exchange
can induce sizable modifications of K -> pi nu nu-bar rates. Interestingly,
these effects scale as tan^4(beta) at the amplitude level. For large values of
tan(beta), this mechanism allows deviations from the SM expectations even for
tiny (CKM-type) off-diagonal mixing terms in the right-handed squark sector.


title: Neutrino spin oscillations in gravitational fields

abstract:
  We study neutrino spin oscillations in gravitational fields. The
quasi-classical approach is used to describe the neutrino spin evolution. First
we examine the case of a weak gravitational field. We obtain the effective
Hamiltonian for the description of neutrino spin oscillations. We also receive
the neutrino transition probability when a particle propagates in the
gravitational field of a rotating massive object. Then we apply the general
technique to the description of neutrino spin oscillations in the Schwarzschild
metric. The neutrino spin evolution equation for the case of the neutrino
motion in the vicinity of a black hole is obtained. The effective Hamiltonian
and the transition probability are also derived. We examine the neutrino
oscillations process on different circular orbits and analyze the frequencies
of spin transitions. The validity of the quasi-classical approach is also
considered.


title:
Correlating Mu Parameter and Right-Handed Neutrino Masses in N=1
  Supergravity

abstract:
  The minimal supersymmetric standard model, when extended to embed the seesaw
mechanism, obtains two dimensionful parameters in its superpotential: the mu
parameter and the right-handed neutrino mass M_N. These mass parameters,
belonging to the supersymmetric sector of the theory, pose serious naturalness
problems as their scales are left completely undetermined. In fact, for correct
phenomenology, mu must be stabilized at the electroweak scale while M_N lies at
an intermediate scale. In this work we construct an explicit model of the
hidden sector of N=1 supergravity for inducing both mu and M_N at their right
scales. The model we build utilizes lepton number conservation and continuous R
invariance as two fundamental global symmetries to forbid bare mu and M_N
appearing in the superpotential, and induces them at phenomenologically desired
scales via spontaneous breakdown of the global symmetries and the supergravity.
We discuss briefly various phenomenological implications of the model.


title: Z' and the Appelquist-Carrazzone decoupling

abstract:
  We consider the electroweak theory with an additional neutral vector boson
$Z^\prime$ at one loop. We propose a renormalization scheme which makes the
decoupling of heavy $Z^\prime$ effects manifest. The proposed scheme justifies
the usual procedure of performing fits to the electroweak data by combining the
full SM loop corrections to observables with the tree level corrections due to
the extended gauge structure. Using this scheme we discuss in the model with
extra an $U(1)^\prime$ group factor 1-loop results for the $\rho$ parameters
defined in several different ways.


title: The masses of active neutrinos in the nuMSM from X-ray astronomy

abstract:
  In an extention of the Standard Model by three relatively light right-handed
neutrinos (the nuMSM model) the role of the dark matter particle is played by
the lightest sterile neutrino. We demonstrate that the observations of the
extragalactic X-ray background allow to put a strong upper bound on the mass of
the lightest active neutrino and predict the absolute values of the mass of the
two heavier active neutrinos in the nuMSM, provided that the mass of the dark
matter sterile neutrino is larger than 1.8 keV.


title: The Neutralino Mass: Correlation With The Charginos

abstract:
  As the fundamental SU(2) supersymmetric parameters can be determined in the
chargino sector, and the remaining fundamental parameters of the minimal
supersymmetric extensions of the standard model can be analyzed in the
neutralino sector, the two sectors can be correlated via these parameters. We
have shown that for the CP conserving case, the masses of all the neutralinos
can be determined in terms of the chargino masses, and $\tan\beta$. In this
case the neutralino masses are quite insensitive to the variations of
$\tan\beta$; they change by about $%15$ when $\tan\beta$ varies in the range
from 5 to 50. In the CP violating case, the neutralino masses are found to be
quite sensitive to the variations of the CP violating phase. For the heavier
neutralinos the dependence of the masses to the CP violating phase show
complementary behaviour at CP violating points.


title:
Higgs-Mediated e -> mu transitions in II Higgs doublet Model and
  Supersymmetry

abstract:
  We study the phenomenology of the e-mu lepton flavour violation (LFV) in a
general two Higgs Doublet Model (2HDM) including the supersymmetric case. We
compute the decay rate expressions of mu -> e gamma, mu -> eee, and mu -> e
conversion in nuclei at two loop level. In particular, it is shown that mu -> e
gamma is generally the most sensitive channel to probe Higgs-mediated LFV. The
correlations among the decay rates of the above processes are also discussed.


title: Quark masses without Yukawa hierarchies

abstract:
  A model based on the local gauge group SU(3)_c x SU(3)_L x U(1)_X without
particles with exotic electric charges is shown to be able to provide the quark
mass spectrum and their mixing, by means of universal see-saw mechanisms,
avoiding a hierarchy in the Yukawa coupling constants.


title:
On signatures for the Littlest Higgs model in electron-positron
  colliders

abstract:
  There is a recent proposal of identifying the Higgs particle of the Standard
Model as a pseudo Nambu-Goldstone boson. This new broken symmetry introduces
new particles and new interactions. Among these new interactions a central role
to get a new physics is played by the new neutral gauge boson. We have studied
the new neutral currents in the Littlest Higgs model and compared with other
extended models. For high energy $e^+ + e^-$ colliders we present a clear
signature for new neutral gauge bosons that can indicate the theoretical origin
of these particles. Previous analysis by other authors were done at collider
energies equal to the new gauge boson mass $M_{A_H}$. In this paper we show
that asymmetries in fermion anti-fermion production can display model
differences in the case $M_{A_H} > \sqrt{s}$. For $M_{A_H} < \sqrt{s}$ we show
that the hard photon energy distribution in $e^+ + e^- \lra \gamma + f + \bar
f$ can present a model dependence. New bounds for the new neutral gauge boson
masses are also presented.


title: A Quick Guide to SUSY Tools

abstract:
  The last decade has seen the emergence of a wide range of automated
calculations for supersymmetric extensions of the Standard Model. This guide
contains a brief summary of these, with the main focus on hadron collider
phenomenology, as well as a brief introduction to the so-called SUSY Les
Houches Accord. See also the Les Houches Web Repository for BSM Tools:
http://www.ippp.dur.ac.uk/montecarlo/BSM/


title: Lepton Mass Hierarchy and Neutrino Mixing

abstract:
  We speculate that the mass spectrum of three neutrinos might have a normal
hierarchy as that of three charged leptons or that of three up-type (or
down-type) quarks. In this spirit, we propose a novel parametrization of the
$3\times 3$ lepton flavor mixing matrix. Its mixing angles $\theta_l$ and
$\theta_\nu$ can be related to the mass ratios $m_e/m_\mu$ and $m_1/m_2$ in a
specific texture of lepton mass matrices with vanishing (1,1) elements:
$\tan\theta_l = \sqrt{m_e/m_\mu}$ and $\tan\theta_\nu = \sqrt{m_1/m_2}$. The
latter relation, together with solar and atmospheric neutrino oscillation data,
predicts 0.0030 eV $\lesssim m_1 \lesssim$ 0.0073 eV, 0.009 eV $\lesssim m_2
\lesssim $ 0.012 eV and 0.042 eV $\lesssim m_3 \lesssim$ 0.058 eV. The smallest
neutrino mixing angle is found to be $\theta_{13} \approx \theta_l/\sqrt{2}
\approx 3^\circ$, which is experimentally accessible in the near future.


title: X(1835) as a baryonium state with QCD sum rules

abstract:
  In this article, we take the point of view that the X(1835) be a baryonium
state and calculate its mass within the framework of the QCD sum rules
approach. The numerical value of the mass of the X(1835) is consistent with the
experimental data. There may be some baryonium component in the X(1835) state.


title:
Distinguishable RGE running effects between Dirac neutrinos and Majorana
  neutrinos with vanishing Majorana CP-violating phases

abstract:
  In a novel parametrization of neutrino mixing and in the approximation of
$\tau$-lepton dominance, we show that the one-loop renormalization-group
equations (RGEs) of Dirac neutrinos are different from those of Majorana
neutrinos even if two Majorana CP-violating phases vanish. As the latter can
keep vanishing from the electroweak scale to the typical seesaw scale, it makes
sense to distinguish between the RGE running effects of neutrino mixing
parameters in Dirac and Majorana cases. The differences are found to be quite
large in the minimal supersymmetric standard model with sizable $\tan\beta$,
provided the masses of three neutrinos are nearly degenerate or have an
inverted hierarchy.


title: Heavy-quark energy loss at RHIC and LHC

abstract:
  The attenuation of heavy-flavored particles in nucleus-nucleus collisions
tests the microscopic dynamics of medium-induced parton energy loss and, in
particular, its expected dependence on the identity (color charge and mass) of
the parent parton. We discuss the comparison of theoretical calculations with
recent single-electron data from RHIC experiments. Then, we present predictions
for the heavy-to-light ratios of D and B mesons at LHC energy.


title: Black hole production in tachyonic preheating

abstract:
  We present fully non-linear simulations of a self-interacting scalar field in
the early universe undergoing tachyonic preheating. We find that density
perturbations on sub-horizon scales which are amplified by tachyonic
instability maintain long range correlations even during the succeeding
parametric resonance, in contrast to the standard models of preheating
dominated by parametric resonance. As a result the final spectrum exhibits
memory and is not universal in shape. We find that throughout the subsequent
era of parametric resonance the equation of state of the universe is almost
dust-like, hence the Jeans wavelength is much smaller than the horizon scale.
If our 2D simulations are accurate reflections of the situation in 3D, then
there are wide regions of parameter space ruled out by over-production of black
holes. It is likely however that realistic parameter values, consistent with
COBE/WMAP normalisation, are safetly outside this black hole over-production
region.


title: Reply to Comment on "Surprises in threshold antikaon-nucleon physics"

abstract:
  In their Comment, Borasoy et al. [arXiv:hep-ph/0512279], criticize our
results [PRL 95 (2005) 172502] that accommodate both scattering data and the
new accurate measurement by DEAR of the shift and width of kaonic hydrogen. In
our calculations we have employed unitary chiral perturbation theory (UCHPT).
We discuss why their arguments are irrelevant or do not hold.


title: The New Heavy Mesons: A Status Report

abstract:
  A survey of the experimental, phenomenological, and theoretical status of the
new heavy mesons is presented. States discussed are the $B_c$, $h_c$,
$\eta_c'$, $D_s(2317)$, $D_s(2460)$, X(3872), X(3940), Y(3940), Z(3930), and
Y(4260). Quark models for spectra, strong decays, and hadronic interactions are
reviewed and used to interpret the new states. New results for strong decay
models, bound state decays, mesonic molecules, properties of the X(3872), and
the chiral doublet model are also presented.


title: Phenomenology of Minimal Lepton Flavor Violation

abstract:
  We extend the effective theory of Minimal Lepton Flavor Violation (MLFV) by
including four-lepton operators. We compute the rates for mu -> 3 e and tau ->
3 ell decays and point out several new ways to test the hypothesis of MLFV. We
also investigate to what extent it will be possible from (future) experimental
information to pin down the contributions of different effective operators. In
particular we look for experimental handles on quark-lepton operators of the
type $\bar{ell}_i \Gamma \ell_j \times \bar q \Gamma q$ by working out their
contribution to hadronic processes such as tau -> mu pi^0, pi^0 -> mu^- e^+, Y
-> tau^- mu^+, as well as to purely leptonic decays such as mu -> 3 e through
loop effects.


title: Report of the 2005 Snowmass Top/QCD Working Group

abstract:
  This report discusses several topics in both top quark physics and QCD at an
International Linear Collider (ILC). Issues such as measurements at the
$t\bar{t}$ threshold, including both theoretical and machine requirements, and
the determination of electroweak top quark couplings, are reviewed. New results
concerning the potential of a 500 GeV $e^+e^-$ collider for measuring $Wtb$
couplings and the top quark Yukawa coupling are presented. The status of higher
order QCD corrections to jet production cross sections, heavy quark form
factors, and longitudinal gauge boson scattering, needed for percent-level
studies at the ILC, are reviewed. A new study of the measurement of the
hadronic structure of the photon at a $\gamma\gamma$ collider is presented. The
effects on top quark properties from several models of new physics, including
composite models, Little Higgs theories, and CPT violation, are studied.


title: Neutrino Magnetic Moment

abstract:
  Current experimental and observational limits on the neutrino magnetic moment
are reviewed. Implications of the recent results from the solar and reactor
neutrino experiments for the value of the neutrino magnetic moment are
discussed. It is shown that spin-flavor precession in the Sun is suppressed.


title:
Nonlocal Condensates and Current-Current Correlators within the
  Instanton Liquid Model

abstract:
  The quark and gluon nonlocal condensates and current-current correlators are
discussed within the instanton liquid model.


title:
CP violation of the two-body charmless hadronic B decays in the minimal
  supergravity Model

abstract:
  By choosing two typical input parameter points in the minimal supergravity
(mSUGRA) model and using the QCD factorization (QCDF) approach, we studied the
supersymmetric effects to the CP violation of the two-body charmless hadronic
$B$ meson decays. We found that though the SUSY contributions can give large
corrections to the CP asymmetries for some decay channels, they could not be
distinguished experimentally from the SM values because of the large
theoretical errors dominated by calculating the annihilation contributions in
the QCDF approach.


title: Possible new source of T and CP violation in neutrino oscillations

abstract:
  A model is presented to illustrate that vacuum neutrino oscillations can be
essentially T and CP invariant up to a certain energy but strongly T and CP
noninvariant at much higher energies. Detailed model results for the vacuum
probabilities P(nu_mu to nu_e) and P(nu_e to nu_mu) are given, which may be
relevant to proposed long-baseline neutrino-oscillation experiments.


title: A proof of the reggeized form of amplitudes with quark exchanges

abstract:
  A complete proof of the quark Reggeization hypothesis in the leading
logarithmic approximation for any quark--gluon inelastic process in the
multi--Regge kinematics in all orders of $\alpha_s$ is given. First, we show
that the multi--Regge form of QCD amplitudes is guarantied if a set of
conditions on the Reggeon vertices and the trajectories is fulfilled. Then, we
examine these conditions and show that they are satisfied.


title: What Does mu-tau Symmetry Imply about Neutrino Mixings?

abstract:
  The requirement of the mu-tau symmetry in the neutrino sector that yields the
maximal atmospheric neutrino mixing is shown to yield either sin(\theta_{13})=0
(referred to as C1)) or sin(\theta_{12})=0 (referred to as C2)), where
\theta_{12(13)} stands for the solar (reactor) neutrino mixing angle. We study
general properties possessed by approximately mu-tau symmetric textures. It is
argued that the tiny mu-tau symmetry breaking generally leads to
cos(2\theta_{23}) \simsin(\theta_{13}) for C1) and cos(2\theta_{23}) \sim
\Delta m^2_\odot/\Delta m^2_{atm}(\equiv R) for C2), which indicates that the
smallness of cos(2\theta_{23}) is a good measure of the mu-tau symmetry
breaking, where \Delta m^2_{atm} (\Delta m^2_\odot) stands for the square mass
differences of atmospheric (solar) neutrinos. We further find that the relation
R \sim sin^2(\theta_{13}) arises from contributions of O(sin^2(\theta_{13})) in
the estimation of the neutrino masses (m_{1,2,3}) for C1), and that possible
forms of textures are strongly restricted to realize sin^2(2\theta_{12})=O(1)
for C2). To satisfy R \sim sin^2(\theta_{13}) for C1), neutrinos exhibit the
inverted mass hierarchy, or the quasi degenerate mass pattern with | m_{1,2,3}|
\sim O(\sqrt{\Delta m^2_{atm}}), and, to realize sin^2(2\theta_{12})=O(1) for
C2), there should be an additional small parameter \eta whose size is
comparable to that of the mu-tau symmetry breaking parameter \epsilon, giving
tan(2\theta_{12}) \sim \epsilon/\eta with \eta \sim \epsilon to be compatible
with the observed large mixing.


title: Running coupling and screening in the (s)QGP

abstract:
  Emphasizing the importance of renormalization in the context of thermal field
theory in general, it is pointed out that the Debye mass in the hot quark gluon
plasma is determined by the coupling at the scale $m_D$, not $T$ as commonly
presumed. The mended result agrees quantitatively with lattice QCD calculations
in the strong coupling regime almost down to $T_c$.


title:
On the structure of the pi pi invariant mass spectra of the
  Upsilon(4S)-->Upsilon(1S,2S) pi^+ pi^- decays

abstract:
  We perform a model-independent analysis for recently reported data of the
$\pi^+\pi^-$ invariant mass spectra in the
$\Upsilon(4S)\to\Upsilon(1S,2S)\pi^+\pi^-$ decays and point out that there does
exist a broad peak below 0.6 GeV in the data of the
$\Upsilon(4S)\to\Upsilon(1S)\pi^+\pi^-$ decay, which is analogous to that in
the $\Upsilon(3S)\to\Upsilon(1S)\pi^+\pi^-$ decay. With the data of
$\Upsilon(4S)$ decays, we further test our model developed for studying the
puzzle in the $\Upsilon(3S)\to\Upsilon(1S)\pi^+\pi^-$ decay. The result shows
that with such a model, all the $\pi^+\pi^-$ invariant mass spectra of
$\Upsilon(4S)$ decays can be described. We also predict the
$\cos\theta_{\pi}^*$ distributions of
$\Upsilon(4S)\to\Upsilon(1S,2S)\pi^+\pi^-$ decays, which can be used to justify
our model prediction.


title: No Black Holes at IceCube

abstract:
  We discuss modifications of the neutrino-nucleon cross section due to a
minimal length scale. It is shown that the enhancement of the nu-N cross
section due to new physics is suppressed. Especially the potential observation
rate of micro black holes at neutrino telescopes is strongly reduced.


title: Electroweak Corrections to e+e- --> 4 fermions

abstract:
  The calculation of the full electroweak O(alpha) corrections to the
charged-current four-fermion production processes e+e- --> nu_tau tau+ mu-
anti-nu_mu, u anti-d mu- anti-nu_mu, and u anti-d s anti-c is briefly reviewed.
The calculation is performed using the complex-mass scheme for the gauge-boson
resonances. The evaluation of the occurring one-loop tensor integrals, which
include 5- and 6-point functions, requires new techniques. The effects of the
complete O(alpha) corrections to the total cross section and to the
production-angle distribution are discussed and compared to predictions based
on the double-pole approximation, revealing that the latter approximation is
not sufficient to fully exploit the potential of a future linear collider in an
analysis of W-boson pairs at high energies.


title:
Nuclear shadowing in inclusive and tagged deuteron structure functions
  and extraction of F_2^p-F_2^n at small x from electron-deuteron collider data

abstract:
  We review predictions of the theory of leading twist nuclear shadowing for
inclusive unpolarized and polarized deuteron structure functions F_2^D, g_1^D
and b_1^D and for the tagged deuteron structure function F_2^D(x,Q^2,\vec{p}).
We analyze the possibility to extract the neutron structure function F_2^n from
electron-deuteron data and demonstrate that an account of leading twist nuclear
shadowing leads to large corrections for the extraction of F_2^n from the
future deuteron collider data both in the inclusive and in the tagged structure
function modes. We suggest several strategies to address the extraction of
F_2^n and to measure at the same time the effect of nuclear shadowing via the
measurement of the distortion of the proton spectator spectrum in the
semi-inclusive e D \to e^{\prime}NX process. We address the issue of the final
state interactions in the e D \to e^{\prime}NX process and examine how they
affect the extraction of F_2^n.


title: Top Partners at the LHC: Spin and Mass Measurement

abstract:
  If one takes naturalness seriously and also assumes a weakly coupled
extension of the Standard Model (SM) then there are predictions for
phenomenology that can be inferred in a model independent framework. The first
such prediction is that there must be some colored particle with mass O(TeV)
that cancels the top loop contribution to the quadratic divergence of the Higgs
mass. In this paper we begin a model independent analysis of the phenomenology
of this "top partner," t'. We make one additional assumption that it is odd
under a parity which is responsible for the stability of a WIMP dark matter
candidate, N. We focus on three questions to be explored at the LHC: discovery
opportunities, mass determination, and spin determination of this top partner.
We find that within a certain region of masses for the t' and N, t'\bar{t'} is
easily discovered in the t\bar{t}+2N decay with the tops decaying fully
hadronically. We show that without having to rely on other channels for new
physics that for a a given t' spin the masses of t' and N can be measured using
kinematic information (e.g. average MET or H_T) and total cross section. A
degeneracy due to the spin remains, but with several hundred inverse fb of
luminosity we demonstrate potentially useful new methods for determining the t'
spin over a wide range of masses. Our methods could be useful for
distinguishing supersymmetric and non-supersymmetric models.


title:
Connection between In Medium Nucleon Form Factors and Deep Inelastic
  Structure Functions

abstract:
  We present a connection between the modifications induced by the nuclear
medium of the nucleon form factors and of the deep inelastic structure
functions, obtained using the concept of generalized parton distributions.
Generalized parton distributions allow us to access elements of the partonic
structure that are common to both the hard inclusive and exclusive scattering
processes in nuclei.


title: Models of Little Higgs and Electroweak Precision Tests

abstract:
  The little Higgs idea is an alternative to supersymmetry as a solution to the
gauge hierarchy problem. In this note, I review various little Higgs models and
their phenomenology with emphases on the precision electroweak constraints in
these models.


title: Hadronic Parity Violation: a New View through the Looking Glass

abstract:
  Studies of the strangeness changing hadronic weak interaction have produced a
number of puzzles that have so far evaded a complete explanation within the
Standard Model. Their origin may lie either in dynamics peculiar to weak
interactions involving strange quarks or in more general aspects of the
interplay between strong and weak interactions. In principle, studies of the
strangeness conserving hadronic weak interaction using parity violating
hadronic and nuclear observables provide a complementary window on this
question. However, progress in this direction has been hampered by the lack of
a suitable theoretical framework for interpreting hadronic parity violation
measurements in a model-independent way. Recent work involving effective field
theory ideas has led to the formulation of such a framework while motivating
the development of a number of new hadronic parity violation experiments in
few-body systems. In this article, we review these recent developments and
discuss the prospects and opportunities for further experimental and
theoretical progress.


title:
Exclusive Higgs boson production at the LHC: hard rescattering
  corrections

abstract:
  We examine, as a correction to the central exclusive Higgs boson production
in $pp$ collisions at the LHC, the rescattering of gluonic ladders off the
proton. As usual, at the lowest order the hard part of this process can be
described as a fusion of two hard gluonic ladders. We calculate corrections to
this hard amplitude which are due to rescattering of these ladders. These
corrections, which contain high mass diffractive excitations of the proton,
have not yet been taken into account by the usual soft survival probabilities.
We find that the correction due to the exchange of a single hard rescattering
is negative, large and infrared sensitive. As a first step towards a more
reliable description we therefore replace the rescattering exchange by a
unitarized amplitude using the BK equation which generates the saturation scale
$Q_s(x)$. We also include a soft gap survival probability factor. We discuss
the results and outline possible future strategies.


title: Suppression of flavor symmetry breaking in B decay sum rules

abstract:
  While flavor symmetries are useful for studying hadronic B decays, symmetry
relations for amplitudes and decay rates are usually violated by first order
symmetry breaking corrections. We point out two cases in which first order
symmetry breaking is suppressed by a small ratio of amplitudes: (1) An isospin
sum rule for four $B\to K\pi$ decays, where isospin breaking is shown to be
negligible. (2) An SU(3) sum rule for pairs of $B\to K\pi$ and $B\to K\eta_8$,
generalized to pairs of $B\to K\pi, B\to K\eta$ and $B\to K\eta'$.


title: The Creation of Defects with Core Condensation

abstract:
  Defects in superfluid 3He, high-Tc superconductors, QCD colour superfluids
and cosmic vortons can possess (anti)ferromagnetic cores, and their
generalisations. In each case there is a second order parameter whose value is
zero in the bulk which does not vanish in the core. We examine the production
of defects in the simplest 1+1 dimensional scalar theory in which a second
order parameter can take non-zero values in a defect core. We study in detail
the effects of core condensation on the defect production mechanism.


title:
Heavy Quarks and Meson Production in Ultraperipheral Heavy Ion
  Collisions

abstract:
  We report on our recent investigations in photonuclear production of heavy
quarks and vector meson in ultraperipheral heavy ion collisions. In particular,
our theoretical predictions are compared with the recent experimental
measurements on coherent rho (STAR) and J/Psi (PHENIX) photoproduction at RHIC
and estimates for LHC are given.


title: On correlations and discreteness in non-linear QCD evolution

abstract:
  We consider modifications of the standard non-linear QCD evolution in an
attempt to account for some of the missing ingredients discussed recently, such
as correlations, discreteness in gluon emission and Pomeron loops. The
evolution is numerically performed using the Balitsky-Kovchegov equation on
individual configurations defined by a given initial value of the saturation
scale, for reduced rapidities $y=(\alpha_s N_c/\pi) Y<10$. We consider the
effects of averaging over configurations as a way to implement correlations,
using three types of Gaussian averaging around a mean saturation scale.
Further, we heuristically mimic discreteness in gluon emission by considering a
modified evolution in which the tails of the gluon distributions are cut-off.
The approach to scaling and the behavior of the saturation scale with rapidity
in these modified evolutions are studied and compared with the standard
mean-field results. For the large but finite values of rapidity explored, no
strong quantitative difference in scaling for transverse momenta around the
saturation scale is observed. At larger transverse momenta, the influence of
the modifications in the evolution seems most noticeable in the first steps of
the evolution. No influence on the rapidity behavior of the saturation scale
due to the averaging procedure is found. In the cut-off evolution the rapidity
evolution of the saturation scale is slowed down and strongly depends on the
value of the cut-off. Our results stress the need to go beyond simple
modifications of evolution by developing proper theoretical tools that
implement such recently discussed ingredients.


title:
Checking the Burkardt sum rule for the Sivers function by model
  calculations

abstract:
  The Sivers mechanism gives rise to a non-zero average transverse momentum of
partons inside a transversely polarized target. According to a sum rule of
Burkardt this transverse momentum vanishes when summing over all partons. We
explicitly check the Burkardt sum rule by means of one-loop calculations for a
quark target in perturbative QCD and for a diquark spectator model of the
nucleon. In both cases the sum rule is fulfilled.


title: Running Spectral Index as a Probe of Physics at High Scales

abstract:
  The WMAP results on the scalar spectral index n and its running with scale,
though preliminary, open a very interesting window to physics at very high
energies. We address the problem of finding inflaton potentials well motivated
by particle physics which can accomodate WMAP data. We make a model independent
analysis of a large class of models: those with flat tree-level potential
lifted by radiative corrections, which cause the slow rolling of the inflaton
and the running of n. This includes typical hybrid inflation models. In the
small-coupling regime the predictions for the size and running of n are
remarkably neat, e.g. -dn/dln k=(n-1)^2 << 1, and n does not cross n=1,
contrary to WMAP indications. On the other hand, n can run significantly if the
couplings are stronger but at the price of having a small number of e-folds,
Ne. We also examine the effect of mass thresholds crossed during inflation.
Finally, we show that the presence of non-renormalizable operators for the
inflaton, suppressed by a mass scale above the inflationary range, is able to
give both dn/dln k ~ O(-0.05) and Ne ~ 50.


title:
QCD Corrections to Radiative B Decays in the MSSM with Minimal Flavor
  Violation

abstract:
  We compute the complete supersymmetric QCD corrections to the Wilson
coefficients of the magnetic and chromomagnetic operators, relevant in the
calculation of b -> s gamma decays, in the MSSM with Minimal Flavor Violation.
We investigate the numerical impact of the new results for different choices of
the MSSM parameters and of the scale where the quark and squark mass matrices
are assumed to be aligned. We find that the corrections can be important when
the superpartners are relatively light, and that they depend sizeably on the
scale of alignment. Finally, we discuss how our calculation can be employed
when the scale of alignment is far from the weak scale.


title:
Isospin in $B$ Decays and the $(B^0 \bar B^0)/(B^+ B^-)$ Production
  Ratio

abstract:
  Methods are proposed for measuring the ratio $R^{+/0} = \Gamma(\Upsilon(4S)
\to B^+ B^-)/$ $\Gamma(\Upsilon(4S) \to \bo \ob)$ without assuming isospin
invariance in exclusive hadronic decays such as $B \to J/\psi K$. The validity
of isospin invariance in various B decays is discussed. Isospin violations are
expected to be especially small in inclusive semileptonic decays, so that
$\Gamma(B^+ \to X_c^0 \ell^+ \nu_\ell) = \Gamma(B^0 \to X_c^- \ell^+ \nu_\ell)$
is expected to hold at the sub-percent level. Suggestions are made for
utilizing this relation. The accuracy of a ``double-tag'' method for obtaining
$R^{+/0}$, such as that used for measuring the $D^+ D^-/D^0 \od$ ratio at the
$\psi'' \equiv \psi(3770)$, is also estimated.


title: Radiative Transitions in Charmonium from Lattice QCD

abstract:
  Radiative transitions between charmonium states offer an insight into the
internal structure of heavy-quark bound states within QCD. We compute, for the
first time within lattice QCD, the transition form-factors of various
multipolarities between the lightest few charmonium states. In addition, we
compute the experimentally unobservable, but physically interesting vector
form-factors of the $\eta_c, J/\psi$ and $\chi_{c0}$.
  To this end we apply an ambitious combination of lattice techniques,
computing three-point functions with heavy domain wall fermions on an
anisotropic lattice within the quenched approximation. With an anisotropy
$\xi=3$ at $a_s \sim 0.1 \mathrm{fm}$ we find a reasonable gross spectrum and a
hyperfine splitting $\sim 90 \mathrm{MeV}$, which compares favourably with
other improved actions.
  In general, after extrapolation of lattice data at non-zero $Q^2$ to the
photopoint, our results agree within errors with all well measured experimental
values. Furthermore, results are compared with the expectations of simple quark
models where we find that many features are in agreement; beyond this we
propose the possibility of constraining such models using our extracted values
of physically unobservable quantities such as the $J/\psi$ quadrupole moment.
  We conclude that our methods are successful and propose to apply them to the
problem of radiative transitions involving hybrid mesons, with the eventual
goal of predicting hybrid meson photoproduction rates at the GlueX experiment.


title: Transversity GPD in photo- and electroproduction of two vector mesons

abstract:
  The chiral-odd generalized parton distribution (GPD), or transversity GPD, of
the nucleon can be accessed experimentally through the photo- or
electroproduction of two vector mesons on a polarized nucleon target,
\gamma^(*) N --> \rho_1 \rho_2 N', where \rho_1 is produced at large transverse
momentum, \rho_2 is transversely polarized, and the mesons are separated by a
large rapidity gap. We predict the cross section for this process for both
transverse and longitudinal \rho_{2} production. To this end we propose a model
for the transversity GPD H_T(x,\xi,t), and give an estimate of the relative
sizes of the transverse and longitudinal \rho_{2} cross sections. We show that
a dedicated experiment at high energy should be able to measure the
transversity content of the proton.


title: Infrared safe definition of jet flavour

abstract:
  It is common, in both theoretical and experimental studies, to separately
discuss quark and gluon jets. However, even at parton level, widely-used jet
algorithms fail to provide an infrared safe way of making this distinction. We
examine the origin of the problem, and propose a solution in terms of a new
"flavour-kt" algorithm. As well as being of conceptual interest this can be a
powerful tool when combining fixed-order calculations with multi-jet
resummations and parton showers. It also has applications to studies of
heavy-quark jets.


title: Infrared finite coupling in Sudakov resummation

abstract:
  New arguments are presented to emphasize the interest of the infrared finite
coupling approach to power corrections in the context of Sudakov resummation.
The more regular infrared behavior of some peculiar combinations of Sudakov
anomalous dimensions, free of Landau singularities at large Nf, is pointed out.
A general conflict between the infrared finite coupling and infrared renormalon
approaches to power corrections is explained, and a possible resolution is
proposed, which makes use of the arbitrariness of the choice of exponentiated
constant terms. A simple ansatz for a 'universal' non-perturbative Sudakov
effective coupling at large Nf follows naturally from these considerations. In
this last version, a new result is presented: the striking emergence of an
infrared finite perturbative effective coupling in the Drell-Yan process at
large Nf (at odds with the infrared renormalon argument) within the framework
of Sudakov resummation for eikonal cross sections of Laenen, Sterman and
Vogelsang. Some suggestions for phenomenology at finite Nf, alternative to the
shape function approach, are given.


title:
Probing the Orbital Angular Momentum through the Polarized Gluon
  Asymmetry

abstract:
  The orbital angular momentum is one of the least understood of the spin
characteristics of a proton. There are no direct ways to model the orbital
angular momentum. However, the Jz=1/2 sum rule includes an angular momentum
component and can provide indirect access to its properties. One of the other
unknowns in the sum rule is the gluon polarization. We can define the gluon
spin asymmetry in a proton as the ratio of the polarized to unpolarized gluon
distributions. This can be written as a sum of a scale-invariant piece and a
small scale-dependent term. The x-dependence of the asymmetry can be calculated
and a suitable parametrization for scale-dependent term can be made to estimate
this asymmetry. When combined with the measured unpolarized gluon density, this
provides a model independent prediction for the polarized gluon distribution.
This eliminates one unknown in the Jz=1/2 sum rule and allows a reasonable
estimate for the size and evolution of the orbital angular momentum of the
constituents.


title: TeV-Scale Stringy Signatures at the Electron-positron Collider

abstract:
  We investigate the TeV-scale stringy signals of the four-fermion scattering
at the electron-positron collider with the center of mass energy 500-1000 GeV.
The nature of the stringy couplings leads to distinguishable asymmetries
comparing to the other new physics models. Specifically, the stringy states in
the four-fermion scattering at the leading-order corrections are of spin-1 and
2 with the chiral couplings inherited from the gauge bosons identified as the
zeroth-mode string states. The angular left-right, forward-backward,
center-edge asymmetries and the corresponding polarized-beam asymmetries are
investigated. The low-energy stringy corrections are compared to the ones
induced by the Kaluza-Klein (KK) gravitons. The angular left-right asymmetry of
the scattering with the final states of u and d-type quarks, namely c and b,
shows significant deviations from the Standard Model values. The center-edge
and forward-backward asymmetries for all final-states fermions also show
significant deviations from the corresponding Standard Model values. The
differences between the signatures induced by the stringy corrections and the
KK gravitons are appreciable in both angular left-right and forward-backward
asymmetries.


title: Open-charm meson spectroscopy

abstract:
  We present a theoretical framework that accounts for the new $D_J$ and
$D_{sJ}$ mesons measured in the open-charm sector. These resonances are
properly described if considered as a mixture of conventional $P-$wave
quark-antiquark states and four-quark components. The narrowest states are
basically $P-$wave quark-antiquark mesons, while the dominantly four-quark
states are shifted above the corresponding two-meson threshold, being broad
resonances. We study the electromagnetic decay widths as basic tools to
scrutiny their nature. The proposed explanation incorporates in a natural way
the most recently discovered mesons in charmonium spectroscopy.


title:
The neutron electric dipole form factor in the perturbative chiral quark
  model

abstract:
  We calculate the electric dipole form factor of the neutron in a perturbative
chiral quark model, parameterizing CP-violation of generic origin by means of
effective electric dipole moments of the constituent quarks and their
CP-violating couplings to the chiral fields. We discuss the relation of these
effective parameters to more fundamental ones such as the intrinsic electric
and chromoelectric dipole moments of quarks and the Weinberg parameter. From
the existing experimental upper limits on the neutron EDM we derive constraints
on these CP-violating parameters.


title: Antenna subtraction method for jet calculations at NNLO

abstract:
  We describe the antenna subtraction method for treating real emission
singularities in the calculation of jet observables at NNLO accuracy, in
particular in view of the computation $e^+e^- \to 3$ jets at NNLO.


title: Selfconsistent calculations of mesonic properties at nonzero temperature

abstract:
  After a brief introduction on QCD and effective models in the first chapter,
I analyze the dependence of the QCD transition temperature on the quark (or
pion) mass in the second chapter. I found that a linear sigma model, which
links the transition to chiral symmetry restoration, predicts a much stronger
dependence of T_c on m_pi than seen in present lattice data for m_pi >~ 0.4
GeV. On the other hand, an effective Lagrangian for the Polyakov loop requires
only small explicit symmetry breaking to describe T_c(m_pi) in the above mass
range. In the third and fourth chapter, I study the linear sigma model with
O(N) symmetry at nonzero temperature in the framework of the
Cornwall-Jackiw-Tomboulis formalism. Extending the set of two-particle
irreducible diagrams by adding sunset diagrams to the usual Hartree-Fock (or
Hartree) contributions, I derive a new approximation scheme which extends the
standard Hartree-Fock (or Hartree) approximation by the inclusion of nonzero
decay widths.


title: Cosmological implication of antisymmetric tensor field on D-brane

abstract:
  We discuss the cosmological implications of an antisymmetric tensor field
when it experiences a kind of ``Higgs mechanism,'' including nonlocal
interaction terms, on D-branes. Even when a huge magnetic-condensation-inducing
anisotropy is assumed in the early universe, the expansion of the universe
leads to an isotropic $B$-matter-dominated universe.


title:
Associated Production of Neutral Higgs Boson with Squark Pair in the
  Minimal Supersymmetric Standard Model with Explicit CP Violation at the CERN
  LHC

abstract:
  We investigate the associated production of neutral Higgs boson with squark
pair in the minimal supersymmetric standard model with and without explicit CP
violation, respectively. We show that the dominant productions in both cases
are always ones of the lightest neutral Higgs boson associated with the
lightest stop pair, which can reach a few pb, in the ranges of parameters
allowed by constraints from the electric dipole moment experiments. In most of
the parameter space, the total cross sections in the case with explicit CP
violation are significantly enhanced, compared with ones without explicit CP
violation. For some special parameters, several orders of magnitude enhancement
can be obtained.


title: Affleck-Dine (Pseudo)-Dirac Neutrinogenesis

abstract:
  We consider the Affleck-Dine mechanism for leptogenesis in the minimal MSSM
with Dirac or Pseudo-Dirac neutrinos. The rolling of scalars along D-flat
directions generates a left-right asymmetry in the sneutrino sector, only the
left part of which is transferred to a baryon asymmetry via sphaleron
transitions. In the pure Dirac case the baryon asymmetry of the Universe is
thus mirrored by an equal and opposite asymmetry in the leptons. The mechanism
is also found to work when the neutrinos are pseudo-Dirac. No additional field
needs to be added to the MSSM other than the right-handed neutrino.


title:
Diffusive scaling and the high-energy limit of deep inelastic scattering
  in QCD at large N_c

abstract:
  Within the limits of the large-N_c approximation (with N_c the number of
colors), we establish the high-energy behaviour of the diffractive and
inclusive cross-sections for deep inelastic scattering at fixed impact
parameter. We demonstrate that for sufficiently high energies and up to very
large values of Q^2, well above the proton average saturation momentum <Q_s^2>,
the cross-sections are dominated by dense fluctuations in the target
wavefunction, that is, by the relatively rare gluon configurations which are at
saturation on the resolution scale Q^2 of the virtual photon. This has
important physical consequences, like the emergence of a new, diffusive,
scaling, which replaces the `geometric scaling' property characteristic of the
mean field approximation. To establish this, we shall rely on a dipole version
of the Good-Walker formula for diffraction (that we shall derive here in the
context of DIS), together with the high-energy estimates for the dipole
scattering amplitudes which follow from the recently established evolution
equations with Pomeron loops and include the relevant fluctuations. We also
find that, as a consequence of fluctuations, the diffractive cross-section at
high energy is dominated by the elastic scattering of the quark-antiquark
component of the virtual photon, up to relatively large virtualities Q^2 >>
<Q_s^2>.


title: Rare Decay of the Top t -> cgg in the Standard Model

abstract:
  We calculate the one-loop flavor changing neutral current top quark decay t
-> cgg in the Standard Model. We demonstrate that the rate for t -> cgg exceeds
the rate for a single gluon emission t -> cg by about two orders of magnitude,
while the rate for t -> cq barq (q=u) is slightly smaller than for t -> cg.


title: Minimal archi-texture for neutrino mass matrices

abstract:
  The origin of the observed masses and mixing angles of quarks and leptons is
one of imperative subjects in and beyond the standard model. Toward a deeper
understanding of flavor structure, we investigate in this paper the minimality
of fermion mass (Yukawa) matrices in unified theory. That is, the simplest
matrix form is explored in light of the current experimental data for quarks
and leptons, including the recent measurements of quark CP violation and
neutrino oscillations. Two types of neutrino mass schemes are particularly
analyzed; (i) Majorana masses of left-handed neutrinos with unspecified
mechanism and (ii) Dirac and Majorana masses introducing three right-handed
neutrinos. As a result, new classes of neutrino mass matrices are found to be
consistent to the low-energy experimental data and high-energy unification
hypothesis. For distinctive phenomenological implications of the minimal
fermion mass textures, we discuss flavor-violating decay of charged leptons,
the baryon asymmetry of the universe via thermal leptogenesis, neutrino-less
double beta decay, and low-energy leptonic CP violation.


title: Proton Decay and Sub-Structure

abstract:
  The problem of elementarity of electric charge is investigated. It is known
that possible proton decay is caused by $X$ and $Y$ bosons which are
characteristic in GUTs. The charge structure of GUTs is, however, not simple,
and the five types of charge units appear. We investigate the problem of
elementarity in taking into account of the simplest model of the charge
structure known as the rishon model, where the charge units are known as 1/3
($T$) and 0 ($V$). In order to approach to sub-structure together with the
problem of simplicity of charge structure, possible rearrangements of rishons
are investigated on the basis of color and hypercolor confinement condition.
Further, possible existence of the simplest electroweak sub-structure is
discussed. Our model predicts possible proton decay mode, in which $X$ and $Y$
bosons are not concerned.


title:
Thermal and Curvature Effects to Spontaneous Symmetry Breaking in phi^4
  Theory

abstract:
  We study the thermal and curvature effect to spontaneous symmetry breaking in
phi^4 theory. The effective potential is evaluated in D-dimensional static
universe with positive curvature R X S^{D-1} or negative curvature R X H^{D-1}.
It is shown that temperature and positive curvature suppress the symmetry
breaking, while negative curvature enhances it. To consider the back-reaction
we numerically solve the gap equation and the Einstein equation simultaneously.
The solution gives the relationship between the temperature and the scale
factor.


title:
Secondary particles spectra in the decay of a polarized top quark with
  anomalous $tWb$ coupling

abstract:
  Analytic expression for energy and angular dependence of a secondary charged
lepton in the decay of a polarized top quark with anomalous $tWb$ couplings in
the presence of all anomalous couplings are derived. The angular distribution
of the b-quark is derived as well. It is presented that the charged lepton spin
correlation coefficient is not very sensitive to the anomalous couplings.
However, the b-quark spin correlation coefficient is sensitive to anomalous
couplings and could be used as a powerful tool for searching of non-SM
coupling.


title:
Evolution of coupled fermions under the influence of an external
  axial-vector field

abstract:
  The evolution of coupled fermions interacting with external axial-vector
fields is described with help of the classical field theory. We formulate the
initial conditions problem for the system of two coupled fermions in
(3+1)-dimensional space-time. This problem is solved using the perturbation
theory. We obtain in the explicit form the expressions for the leading and next
to the leading order terms in the expansion over the strength of external
fields. It is shown that in the relativistic limit the intensity of the fermion
field coincides with the transition probability in the two neutrinos system
interacting with moving and polarized matter.


title: Constraints on new interactions from neutron scattering experiments

abstract:
  Constraints for the constants of hypothetical Yukawa-type corrections to the
Newtonian gravitational potential are obtained from analysis of neutron
scattering experiments. Restrictions are obtained for the interaction range
between 10^{-12} and 10^{-7} cm, where Casimir force experiments and atomic
force microscopy are not sensitive. Experimental limits are obtained also for
non-electromagnetic inverse power law neutron-nucleus potential. Some
possibilities are discussed to strengthen these constraints.


title:
Future neutrino oscillation facilities: physics priorities and open
  issues

abstract:
  The recent discovery that neutrinos have mass opens a wide new field of
experimentation. Accelerator-made neutrinos are essential. Ideas for future
facilities include superbeams beta-beams and neutrino factories, each
associated with one or several options for detector systems. A summary of the
perceived virtues and shortcomings of these options, and a number of open
questions, are presented.


title: Nonminimal supersymmetric standard model with lepton number violation

abstract:
  We carry out a detailed analysis of the nonminimal supersymmetric standard
model with lepton number violation. The model contains a unique trilinear
lepton number violating term in the superpotential which can give rise to
neutrino masses at the tree level. We search for the gauged discrete symmetries
realized by cyclic groups which preserve the structure of the associated
trilinear superpotential of this model, and which satisfy the constraints of
the anomaly cancellation. The implications of this trilinear lepton number
violating term in the superpotential and the associated soft supersymmetry
breaking term on the phenomenology of the light neutrino masses and mixing is
studied in detail. We evaluate the tree and loop level contributions to the
neutrino mass matrix in this model. We search for possible suppression
mechanism which could explain large hierarchies and maximal mixing angles.


title: Dilepton production from hydrodynamically expanding fireball

abstract:
  A hybrid model is put forward for describing relativistic heavy ion
collisions. The early interaction stage responsible for entropy creation is
calculated within the transport Quark-Gluon String Model resulting in an
initial state. The passage to subsequent isoentropic expansion proceeds with
exact account for all conservation laws. Relativistic 3D hydrodynamics with the
mixed phase equation of state is applied to this expansion stage. Essential
differences in evolution of a fireball, described within this model and one for
the Bjorken regime, are noted. The in-medium modified $e^+e^-$ spectra are
studied and confronted with the recent CERES/NA45 data for 8% central Pb+Au
collisions at the bombarding energy 158 AGeV.


title: Constraints on UED KK-neutrino dark matter from magnetic dipole moments

abstract:
  Generically, universal extra dimension (UED) extensions of the standard model
predict the stability of the lightest Kaluza-Klein (KK) particle and hence
provide a dark matter candidate. For UED scenarios with one extra dimension, we
model-independently determine the size of the induced dimension-five magnetic
dipole moment of the KK-neutrino, $\nu^{(1)}$. We show that current
observational bounds on the interactions of dipole dark matter place
constraints on UED models with KK-neutrino dark matter.


title: Threshold Resummation for W-Boson Production at RHIC

abstract:
  We study the resummation of large logarithmic perturbative corrections to the
partonic cross sections relevant for the process pp -> W^+- X at the BNL
Relativistic Heavy Ion Collider (RHIC). At RHIC, polarized protons are
available, and spin asymmetries for this process will be used for precise
measurements of the up and down quark and anti-quark distributions in the
proton. The corrections arise near the threshold for the partonic reaction and
are associated with soft-gluon emission. We perform the resummation to
next-to-leading logarithmic accuracy, for the rapidity-differential cross
section. We find that resummation leads to relatively moderate effects on the
cross sections and spin asymmetries.


title: An Improved Analysis of $b\to s\gamma$ in Supersymmetry

abstract:
  An improved analysis of the $b\to s+\gamma$ decay in the minimal flavor
violating case is given taking into account additional contributions in the
supersymmetric sector which enter in the next-to-leading-order (NLO) and are
enhanced by $\tan\beta$ factors. Specifically, we compute a set of twenty
one-loop diagrams to give the most complete analysis to date of the NLO
supersymmetric corrections. These modifications are computed from the effective
charged Higgs and neutral Higgs couplings involving twelve loop diagrams for
the charged Higgs sector and eight loop diagrams for the neutral Higgs sector.
While the computations of these corrections are available in the literature,
their full forms including the complex phase dependence has not be considered.
  Our analysis takes account of the full allowed set of twenty one-loop
diagrams and is more general since it also includes the full dependence on CP
phases in non universal sugra and MSSM models. A numerical analysis is carried
out to estimate the size of the corrections to $b\to s+\gamma$. We also briefly
discuss the implications of these results for the search for supersymmetry.


title: Heavy Quarks: Summary Report

abstract:
  The present status of the heavy-quark production theory is critically
reviewed in the first contribution. The second contribution summarises the
present heavy flavour data from HERA and gives an outlook of what can be
expected from HERA-II. The potential of the LHC experiments for charm and
beauty physics is reviewed in the 3rd contribution. Then the relevance of
saturation and small-x effects to heavy quark production at HERA and at the LHC
are discussed. The non-perturbative aspects of heavy-quark fragmentation and
their relevance to HERA and LHC are discussed in the next contribution.
Finally, a comparison of different theoretical predictions for HERA and LHC
based on different approaches is presented.


title: ep-Finite Basis of Master Integrals for the Integration-By-Parts Method

abstract:
  It is shown that for every problem within dimensional regularization, using
the Integration-By-Parts method, one is able to construct a set of master
integrals such that each corresponding coefficient function is finite in the
limit of dimension equal to four. We argue that the use of such a basis
simplifies and stabilizes the numerical evaluation of the master integrals. As
an example we explicitly construct the ep-finite basis for the set of all
QED-like four-loop massive tadpoles. Using a semi-numerical approach based on
Pade approximations we evaluate analytically the divergent and numerically the
finite part of this set of master integrals.
  The calculations confirm the recent results of Schr\"oder and Vuorinen. All
the contributions found there by fitting the high precision numerical results
have been confirmed by direct analytical calculation without using any
numerical input.


title: Thermalization and Flow of Heavy Quarks in the Quark-Gluon Plasma

abstract:
  Elastic scattering of charm (c) and bottom (b) quarks via D- and B-meson
resonance states in an expanding, strongly interacting quark-gluon plasma is
investigated. Drag and diffusion coefficients are calculated from an effective
model based on chiral symmetry and heavy-quark effective theory, and utilized
in a relativistic Langevin simulation to obtain transverse-momentum spectra and
elliptic flow (v_2) of c- and b-quarks. The hadronization to D- and B-mesons is
described by coalescence and fragmentation, and the resulting decay-electron
spectra are compared to recent RHIC data.


title:
Flavour Dynamics & CP Violation in the SM*: A Tale in Five Parts of
  Great Successes, Little Understanding -- and Promise for the Future!

abstract:
  Our knowledge of flavour dynamics has undergone a `quantum jump' since just
before the turn of the millenium: direct \cp violation has been firmly {\em
established} in $K_L \to \pi \pi$ decays in 1999; the first \cp asymmetry
outside $K_L$ decays has been discovered in 2001 in $B_d \to \psi K_S$,
followed by $B_d \to \pi^+\pi^-$ and $B \to K^{\pm}\pi^{\mp}$, the latter
establishing direct \cp violation also in the beauty sector. Furthermore CKM
dynamics allows a description of \cp insensitive and sensitive $B$, $K$ and $D$
transitions that is impressively consistent also on the quantitative level.
Theories of flavour dynamics that could serve as {\em alternatives} to CKM have
been ruled out. Yet these novel successes of the Standard Model (SM) do not
invalidate any of the theoretical arguments for the incompleteness of the SM.
In addition we have also more direct evidence for New Physics, namely neutrino
oscillations, the observed baryon number of the Universe, dark matter and dark
energy. While the New Physics anticipated at the TeV scale is not likely to
shed any light on the SM's mysteries of flavour, detailed and comprehensive
studies of heavy flavour transitions will be essential in diagnosing salient
features of that New Physics. Strategic principles for such studies will be
outlined.


title:
Decay of Spin-One Particle into Two Photons in Presence of Uniform
  External Magnetic Field

abstract:
  Yang's theorem states that an initial J=1 state cannot decay into two
photons. Because of this result some reactions relating to elementary particles
or atomic transitions can be ruled out. The theorem is not valid in the
presence of background electric or magnetic fields. In this work we show that
the decay of a J=1 particle into two photons is permitted by Bose symmetry and
rotational invariance when the background of the decay process is not pure
vacuum but contains an external classical magnetic/electric field. We also
discuss constraints on these amplitudes from {\bf CP} invariance.


title:
The reaction e+e- --> e+e-pi+pi- and the pion form factor measurements
  via the radiative return method

abstract:
  The role of the reaction e+e- --> e+ e-pi+pi- in the pion form factor
measurements via radiative return method without photon tagging is studied in
detail. The analysis is based on the developed Monte Carlo program EKHARA,
which ingredients are also presented.