title: Trailing Edge Unification via an Intermediate Pati-Salam Group

abstract:
  We demonstrate to two-loop order that an intermediate symmetrically embedded
Pati-Salam $SU(2)_L \times SU(2)_R \times SU(4)$ level of symmetry is all that
is necessary to accommodate empirical values of $\alpha(M_z), \alpha_s(M_z)$
and $\sin^2\theta_w(M_z)$ within a grand unification context but with a high
(10^{14} GeV) intermediate mass scale and with a concomitant higher GUT scale.


title: Neighboring Valley in the String Landscape

abstract:
  The observation in the universe of a small but positive vacuum energy
strongly suggests, in the string landscape picture, that there will ultimately
be a phase transition to an exactly supersymmetric universe. This ground state
or "true vacuum" of the universe could be similar to the minimal supersymmetric
standard model with all the susy breaking parameters set to zero.
Alternatively, it might be similar to the prominent superstring theories with
nine flat space dimensions or to the supersymmetric anti-deSitter model that
seems to be equivalent to a conformal field theory. We propose that the
dominant phenomenological feature of these potential future universes is the
weakening of the Pauli principle due to Fermi-Bose degeneracy. Providing the
phase transition occurs in the cosmologically near future, an exact
supersymmetry could extend the life expectancy of intelligent civilizations far
beyond what would be possible in the broken susy universe.


title: Lifetimes of the Heavy Neutral Leptons in the Okamura Model

abstract:
  We study the lifetimes of TeV-scale heavy neutral leptons (Majorana
neutrinos) that appear in a model suggested by Okamura et al. [2]. We develop a
convenient way to parametrize the neutrino mass texture of the model, and
illustrate our method by calculating the mass spectrum, decay widths, and
lifetimes of the heavy particles over the entire parameter space. From the mass
spectrum, we find that for most of the parameter space, only two-body decays
are relevant in the calculation of the lifetime, with typical values falling in
the range of 10^(-26) to 10^(-24) seconds. If the particles discussed here are
created at colliders, their lifetimes are short enough for them to decay inside
the detector, while long enough to lead to a narrow peak in the invariant mass
spectrum of the decay products. However, an analysis by Dicus, Karatas, and Roy
[16] suggests that they may be difficult to observe at the LHC.


title:
DIS at low x, saturation scale, gluon structure function and
  vector-meson production

abstract:
  Deep inelastic scattering at low x can be described by essentially only two
fitted parameters. The interpretation of J/Psi photoproduction in terms of the
gluon structure function is elaborated upon.


title: Basics of inflationary cosmology

abstract:
  The early stages of the universe evolution are discussed according to the hot
big bang model and the grand unified theories. The shortcomings of big bang are
summarized and their resolution by inflationary cosmology is sketched.
Cosmological inflation, the subsequent oscillation and decay of the inflaton
field, and the resulting reheating of the universe are studied in some detail.
The density perturbations produced by inflation and the temperature
fluctuations of the cosmic microwave background radiation are introduced. The
hybrid inflationary model is described. Two natural variants of the
supersymmetric version of this model which avoid the disaster encountered in
its standard realization from the overproduction of magnetic monopoles are
presented.


title: Cross sections at NNLO

abstract:
  In this talk we report on the state of the art on the calculation of cross
section at next-to-next-to-leading (NNLO) accuracy.


title: Recursive equations for arbitrary scattering processes

abstract:
  The usefulness of recursive equations to compute scattering matrix elements
for arbitrary processes is discussed. Explicit results at tree and one-loop
order, obtained by the HELAC/PHEGAS package that is based on the
Dyson-Schwinger recursive equations approach, are briefly presented.


title: Signatures of Mach Shocks at RHIC

abstract:
  Hard partons propagating through hot and dense matter loose energy, leading
to the observed depletion of hard hadron spectra in nucleus nucleus collision
as compared to scaled proton proton collisions. This lost energy has to
reappear in the medium due to the conservation of energy. Apart from heating
the medium, there is the possibility that a propagating collective mode is
excited. We outline a formalism that can be used to track the propagation of
such a mode through the evolving medium if its dispersion relation is known and
to calculate the resulting distortion of hadronic spectra at freeze-out. Using
this formalism, we demonstrate within a detailed picture of the evolution of
the expanding system and the experimental trigger conditions that the
assumption of a sound mode being excited is in line with 2-particle correlation
measurements by PHENIX and STAR for a semi-hard trigger. In this case, the
measurement is sensitive to the averaged speed of sound in the hot matter. We
also make suggestions how this sensitivity can be improved.


title: A remark on the low mass dilepton yield in heavy ion collisions

abstract:
  The recent data on the enhancement of the low mass dilepton yield in heavy
ion collisions are interpreted as an effect of the "prolonged life" of
resonances in the hadron gas phase. The value of the enhancement factor gives
an upper limit for the duration time of this phase.


title:
Two-parton contribution to the heavy-quark A_FB at NNLO QCD in e+e-
  collisions

abstract:
  At the next generation of linear colliders, forward-backward asymmetries will
be involved again in the precise determination of the neutral current couplings
of heavy quarks in inclusive heavy-quark production. The theoretical
understanding of these observables at the level of NNLO radiative corrections
is required. We review a recent calculation of the two-parton contribution to
the heavy-quark A_FB at NNLO QCD in e+e- collisions. The results are valid for
arbitrary values of the momentum transfer and non-vanishing heavy-quark mass
m_Q.


title: Closing Talk: QCD Moriond 2006

abstract: I comment on some theoretical work presented at QCD Moriond 2006.


title: Effective Charges, Event Shapes and Power Corrections

abstract:
  We introduce and motivate the method of effective charges, and consider how
to implement an all-orders resummation of large kinematical logarithms in this
formalism. Fits for QCD \Lambda and power corrections are performed for the
e+e- event shape observables 1-thrust and heavy-jet mass, and somewhat smaller
power corrections found than in the usual approach employing the ``physical
scale'' choice.


title:
Fractional Analytic Perturbation Theory in Minkowski space and
  application to Higgs boson decay into a b\bar{b} pair

abstract:
  We work out and discuss the Minkowski version of Fractional Analytic
Perturbation Theory (FAPT) for QCD observables, recently developed and
presented by us for the Euclidean region. The original analytic approach to
QCD, initiated by Shirkov and Solovtsov, is summarized and relations to other
proposals to achieve an analytic strong coupling are pointed out. The developed
framework is applied to the Higgs boson decay into a b\bar{b} pair, using
recent results for the massless correlator of two quark scalar currents in the
\bar{MS} scheme. We present calculations for the decay width within MFAPT
including those non-power-series contributions that correspond to the
O(\alpha_{s}^{3})-terms, taking also into account evolution effects of the
running coupling and the b-quark-mass renormalization. Comparisons with
previous results within standard QCD perturbation theory are performed and the
differences are pointed out. The interplay between effects originating from the
analyticity requirement and the analytic continuation from the spacelike to the
timelike region and those due to the evolution of the heavy-quark mass is
addressed, highlighting the differences to the conventional QCD perturbation
theory.


title:
A numerical approach to the double real radiation part of e+e- to 3 jets
  at NNLO

abstract:
  We report on the sector decomposition approach to the double real radiation
part of e^+e^- to 3 jets at NNLO.


title:
Infrared structure of $e^+e^- \to 3$ jets at NNLO: QED-type
  contributions

abstract:
  The NNLO QCD corrections to the $e^+e^- \to 3$ jets can be decomposed
according to their colour factors. Out of the seven colour factors, three are
of QED-type: $1/N^2$, $N_F/N$ and $N_F^2$. We use the antenna subtraction
method to compute these contributions, providing complete expressions for the
subtraction terms in $N_F/N$ and $N_F^2$.


title:
Threshold Resummation Effects in the polarized Drell-Yan process at GSI
  and J-PARC

abstract:
  We present studies of QCD corrections to dilepton production in transversely
polarized pp and \bar{p}p scattering. In particular we briefly discuss the
effects of NNLL threshold resummation on the rapidity distribution of the
lepton pair.


title: Study of $\eta'\to\eta\pi^+\pi^-$ Dalitz plot

abstract:
  Dalitz plot of the $\eta' \to \eta\pi^+\pi^-$ decay is studied using the data
collected with the VES spectrometer in two different exclusive reactions. The
coefficients for the matrix element squared decomposition are measured on the
largest statistics of $\eta'$ decays reported so far.


title:
Neutrino tri-bi-maximal mixing from a non-Abelian discrete family
  symmetry

abstract:
  The observed neutrino mixing, having a near maximal atmospheric neutrino
mixing angle and a large solar mixing angle, is close to tri-bi-maximal. We
argue that this structure suggests a family symmetric origin in which the
magnitude of the mixing angles are related to the existence of a discrete
non-Abelian family symmetry. We construct a model in which the family symmetry
is the non-Abelian discrete group $\Delta(27)$, a subgroup of SU(3) in which
the tri-bi-maximal mixing directly follows from the vacuum structure enforced
by the discrete symmetry. In addition to the lepton mixing angles, the model
accounts for the observed quark and lepton masses and the CKM matrix. The
structure is also consistent with an underlying stage of Grand Unification.


title: QCD and Monte Carlo event generators

abstract:
  Shower Monte Carlo event generators have played an important role in particle
physics. Modern experiments would hardly be possible without them. In this talk
I discuss how QCD physics is incorporated into the mathematical structure of
these programs and I outline recent developments including matching between
events with different numbers of hard jets and the inclusion of next-to-leading
order effects.


title: Generalised leptonic colour

abstract:
  It is conceivable that there is an $SU(N)_{\ell}$ `colour' gauge group for
leptons, analogous to the gauged $SU(3)_q$ colour group of the quarks. The
standard model emerges as the low energy effective theory when the leptonic
colour is spontaneously broken. The simplest such generalised leptonic colour
models are constructed. We show that the see-saw mechanism for small neutrino
masses, along with the theoretical constraint of electric charge quantisation,
suggests that the models with $N = 3, 5, 7$ are the theoretically most
promising cases. A striking feature of generalized leptonic colour is the
physics associated with the extra leptonic degrees of freedom -- the liptons.
These particles can potentially be discovered at future colliders, such as the
LHC, making the idea testable in the near future.


title:
Neutrino Parameter Space for a Vanishing $ee$ Element in the Neutrino
  Mass Matrix

abstract:
  The consequences of a texture zero at the $ee$ entry of neutrino mass matrix
in the flavor basis, which also implies a vanishing effective Majorana mass for
neutrinoless double beta decay, have been studied for Majorana neutrinos. The
neutrino parameter space under this condition has been constrained in the light
of all available neutrino data including the CHOOZ bound on $s_{13}^{2}$.


title: Excursions into FeynArts and FormCalc

abstract:
  Programming techniques which extend the capabilities of FeynArts and FormCalc
are introduced and explained using examples from real applications.


title: Present Status of Lattice QCD at nonzero T and \mu

abstract:
  I review a few selected topics in Lattice Quantum Chromo Dynamics, focusing
more on the recent results. These include i) the equation of state and speed of
sound, ii) J/\psi suppression, iii) flavour correlations and iv) the QCD phase
diagram in the \mu-T plane.


title: Chiral freedom and electroweak symmetry breaking

abstract:
  Antisymmetric tensor fields with chiral couplings to quarks and leptons may
induce spontaneous electroweak symmetry breaking in a model without a
``fundamental'' Higgs scalar. No microscopic local mass term for the chiral
tensors or ``chirons'' is allowed by the symmetries and our model exhibits only
dimensionless couplings. However, the chiral couplings are asymptotically free
and therefore generate a mass scale where they grow large. We argue that at
this scale mass terms for the chiral tensor fields are generated
non-perturbatively - the chirons appear as new massive spin one particles.
Furthermore a scalar top-antitop condensate forms, giving mass to the weak
gauge bosons and fermions. In this scenario the longstanding gauge hierarchy
problem finds a solution similar to the mass generation in QCD. We compute the
general form of the effective action for the chiral tensors and sketch several
possibilities of their detection at LHC or through precision tests of the
electroweak standard model.


title:
Supergravity corrections to the $(g-2)_l$ factor by Implicit
  Regularization

abstract:
  We apply Implicit regularization in the calculation of the one-loop graviton
and gravitino corrections to the anomalous magnetic moment of the lepton in
unbroken supergravity, which is known to be an important test for any
regularization method. We find a null result as it is expected from
supersymmetry. We compare our results with the ones obtained by using
Differential Regularization and Dimensional Reduction, which are known to
preserve supersymmetry at one-loop order.


title: Threshold resummed spectra in semi-inclusive B decays

abstract:
  I discuss some aspects of the universality of soft gluon dynamics in
semileptonic and radiative decays at the threshold region.


title: Extra $Z$ bosons and low-energy tests of unification

abstract:
  If there is an extra U(1) gauge symmetry broken at low energies, then it may
be possible from the charges of the known quarks and leptons under this U(1) to
make inferences about how much gauge unification occurs at high scales and
about the unification group. (For instance, there are certain observed
properties of an extra $U(1)'$ that would be inconsistent with unification in
four dimensions at high scales.) A general analysis is presented. Two criteria
used in this analysis are (1) the degree to which the generator of the extra
U(1) mixes with hypercharge, and (2) the ratio of the extra U(1) charge of the
"10" and the "$\bar{5}$" of quarks and leptons.


title: Cargese Lectures on Extra Dimensions

abstract:
  I give a pedagogical introduction to the concepts and the tools that are
necessary to study particle physics models in higher dimensions. I then give a
more detailed presentation of warped compactifications and discuss their
possible relevance to the hierarchy problem.


title: Neutrino Mass Matrix from Delta(27) Symmetry

abstract:
  The discrete subgroup Delta(27) of SU(3) has some interesting properties
which may be useful for understanding charged-lepton and neutrino mass
matrices. Assigning leptons to the 3 and 3* representations of Delta(27), a
simple form of the Majorana neutrino mass matrix is obtained and compared to
present data.


title: Color-dressed recursive relations for multi-parton amplitudes

abstract:
  Remarkable progress inspired by twistors has lead to very simple analytic
expressions and to new recursive relations for multi-parton color-ordered
amplitudes. We show how such relations can be extended to include color and
present the corresponding color-dressed formulation for the Berends-Giele, BCF
and a new kind of CSW recursive relations. A detailed comparison of the
numerical efficiency of the different approaches to the calculation of
multi-parton cross sections is performed.


title: Physics Beyond the Standard Model

abstract: I review recent theoretical work on electroweak symmetry breaking.


title:
micrOMEGAs2.0: a program to calculate the relic density of dark matter
  in a generic model

abstract:
  micrOMEGAs2.0 is a code which calculates the relic density of a stable
massive particle in an arbitrary model. The underlying assumption is that there
is a conservation law like R-parity in supersymmetry which guarantees the
stability of the lightest odd particle. The new physics model must be
incorporated in the notation of CalcHEP, a package for the automatic generation
of squared matrix elements. Once this is done, all annihilation and
coannihilation channels are included automatically in any model. Cross-sections
at $v=0$, relevant for indirect detection of dark matter, are also computed
automatically. The package includes three sample models: the minimal
supersymmetric standard model (MSSM), the MSSM with complex phases and the
NMSSM. Extension to other models, including non supersymmetric models, is
described.


title: Precision calculations for the Higgs decays H-->ZZ/WW-->4leptons

abstract:
  Extending earlier work, we provide predictions obtained with the Monte Carlo
generator PROPHECY4f for the decays H-->ZZ/WW-->4l including the complete
electroweak O(alpha) corrections and some higher-order improvements. The
gauge-boson resonances are described in the complex-mass scheme. Here,
particular attention is paid to a comparison of different final states with
identical charges, such as e+e-mu+mu- and mu+mu-mu+mu-.


title: Status of baryonic B decays

abstract:
  An overview of exclusive two-body and three-body baryonic B decays is given.
The threshold enhancement effect in the dibaryon invariant mass and the angular
distributions in the dibaryon rest frame are stressed and explained. Weak
radiative baryonic B decays mediated by the electromagnetic penguin process
$b\to s\gamma$ are discussed. Apart from the first observation of the radiative
penguin decay $B^-\to\Lambda\bar p\gamma$ with the baryonic final state, the
decay $B^-\to \Xi^0\bar\Sigma^-\gamma$ at the level of $6\times 10^{-7}$ may be
accessible to B factories in the near future.


title: An AdS/CFT Calculation of Screening in a Hot Wind

abstract:
  One of the challenges in relating experimental measurements of the
suppression in the number of J/\psi mesons produced in heavy ion collisions to
lattice QCD calculations is that whereas the lattice calculations treat J/\psi
mesons at rest, in a heavy ion collision a c\bar c pair can have a significant
velocity with respect to the hot fluid produced in the collision. The putative
J/\psi finds itself in a hot wind. We present the first rigorous
non-perturbative calculation of the consequences of a wind velocity v on the
screening length L_s for a heavy quark-antiquark pair in hot N=4 supersymmetric
QCD. We find L_s(v,T) = f(v)[1-v^2]^{1/4}/\pi T with f(v) only mildly dependent
on v and the wind direction. This L_s(v,T)\sim L_s(0,T)/\sqrt{\gamma} velocity
scaling, if realized in QCD, provides a significant additional source of J/\Psi
suppression at transverse momenta which are high but within experimental reach.


title: Constraint on $\Delta g(x)$ at large $x$

abstract:
  We investigate the polarized gluon distribution \Delta g(x) by a global
analysis of current DIS data and the \pi^0 data from RHIC-Spin experiments. The
\pi^0 data provide a strong constraint on \Delta g(x), so that its uncertainty
is reduced. Furthermore, new DIS data of COMPASS and HERMES play an important
role in determining \Delta g(x) at large x.


title:
All-order Finiteness of the Higgs Boson Mass in the Dynamical
  Gauge-Higgs Unification

abstract:
  In the dynamical gauge-Higgs unification, it is shown that the mass of the
Higgs boson (4D scalar field) in U(1) gauge theory in $M^4 \times T^n$
($n=1,2,3,...$) is finite to all order in perturbation theory as a consequence
of the large gauge invariance. It is conjectured that the Higgs boson mass is
finite in non-Abelian gauge theory in $M^4 \times S^1$, $M^4 \times (S^1/Z_2)$
and the Randall-Sundrum warped spacetime to all order in the rearranged
perturbation theory where the large gauge invariance is maintained.


title: Optimal conditions for exploring high-density baryonic matter

abstract:
  Using simple parametrizations of the thermodynamic freeze-out parameters
extracted from the data over a wide beam-energy range, we reexpress the
hadronic freeze-out line in terms of the underlying dynamical quantities, the
net baryon density rhoB and the energy density epsilon, which are subject to
local conservation laws. This analysis makes it apparent that rhoB exhibits a
maximum as the collision energy is decreased. This maximum freeze-out density
has muB=400-500 MeV, which is above the critical value, and it is reached for a
fixed-target bombarding energy of 20-30 GeV/A.


title:
Effects of eight-quark interactions on the hadronic vacuum and mass
  spectra of light mesons

abstract:
  The combined effective low energy QCD Lagrangians of Nambu -- Jona-Lasinio
(NJL) and 't Hooft are supplemented with eight-quark interactions. This work is
a follow-up of recent findings, namely (i) the six quark flavour determinant 't
Hooft term destabilizes the NJL vacuum, (ii) the addition of a chiral invariant
eight-fermion contact term renders the ground state of the theory globally
stable; (iii) stability constrains the values of coupling constants of the
model, meaning that even in the presence of eight-quark forces the system can
be unstable in a certain parameter region. In the present work we study a
phenomenological output of eight-quark interactions considering the mass
spectra of pseudoscalar and scalar mesons. Mixing angles are obtained and their
equivalence to the two angle approach is derived. We show that the masses of
pseudoscalars are almost neutral to the eight-quark forces. The only marked
effect of the second order in the SU(3) breaking is found in the $\eta -\eta'$
system. The scalars are more sensitive to the eight-quark interactions. A
strong repulsion between the singlet-octet members is the reason for the
obtained low mass of the $\sigma$ state within the model considered.


title: Dark Matter candidate in a Heavy Higgs Model - Direct Detection Rates

abstract:
  We investigate direct detection rates for Dark Matter candidates arise in a
$SU(2)_L\times U(1)_Y$ with an additional doublet Higgs proposed by Barbieri,
Hall and Rychkov. We refer this model as `Heavy Higgs Model'. The Standard
Model Higgs mass comes out in this model very heavy adopting the few per cent
chance that there is no Higgs boson mass below 200 GeV. The additional Higgs
boson develops neither any VEV due to the choice of coefficient of the scalar
potential of the model nor it has any coupling with fermions due to the
incorporation of a discrete parity symmetry. Thus, the neutral components of
the extra doublet are stable and can be considered as probable candidate of
Cold Dark Matter. We have made calculations for three different types of Dark
Matter experiments, namely, $^{76}$Ge (like GENIUS), DAMA (NaI) and XENON
($^{131}$Xe). Also demonstrated the annual variation of Dark Matter detection
in case of all three detectors considered.


title:
CP violation and Leptogenesis in models with Minimal Lepton Flavour
  Violation

abstract:
  We investigate the viability of leptogenesis in models with three heavy
right-handed neutrinos, where the charged-lepton and the neutrino Yukawa
couplings are the only irreducible sources of lepton-flavour symmetry breaking
(Minimal Lepton Flavour Violation hypothesis). We show that in this framework a
specific type of resonant leptogenesis can be successfully accomplished. For
natural values of the free parameters, this mechanism requires a high
right-handed neutrino mass scale ($M_\nu \gsim 10^{12}$ GeV). By means of a
general effective field theory approach, we analyse the impact of the CP
violating phases responsible for leptogenesis on the low-energy FCNC
observables and derive bounds on the scale of flavour violating new physics
interactions. As a result of the high value of the scale of total lepton-number
violation, in this class of models the $\mu\to e\gamma$ decay is expected to be
close to the present exclusion limit (under the additional assumption of new
particles carrying lepton flavour at the TeV scale).


title: NLO perturbative QCD predictions for gamma gamma -> M+ M- (M=pi,K)

abstract:
  We report the first complete leading-twist next-to-leading-order perturbative
QCD predictions for the two-photon exclusive channels gamma gamma -> M+ M-
(M=pi,K) at large momentum transfer. The asymptotic distribution amplitude is
utilized as a candidate form for the nonperturbative dynamical input.
Comparison of the obtained results with the existing experimental data does not
provide sufficiently clear evidence to support the applicability of the
hard-scattering approach at currently accessible energies.


title: Adjoint Chiral Supermultiplets and Their Phenomenology

abstract:
  Matter fields in the MSSM are chiral supermultiplets in fundamental (or
singlet) representations of the standard model gauge group. In this paper we
introduce chiral superfields in the adjoint representation of $SU(3)_C$ and
study the effective field theory and phenomenology of them. These states are
well motivated by intersecting D-brane models in which additional massless
adjoint chiral supermultiplets appear generically in the low energy spectrum.
Although it has been pointed out that the existence of these additional fields
may make it difficult to obtain asymptotic freedom, we demonstrate that this
consideration does not rule out the existence of adjoints. The QCD gauge
coupling can be perturbative up to a sufficiently high scale, and therefore a
perturbative description for a D-brane model is valid. The full supersymmetric
and soft SUSY breaking Lagrangians and the resulting renormalization group
equations are given. Phenomenological aspects of the adjoint matter are also
studied, including the decay and production processes. The similarity in gauge
interaction between the adjoint fermion and gluino facilitates our study on
these aspects. It is found that these adjoint multiplets can give detectable
signals at colliders and satisfy the constraints from cosmology.


title: FastJet: a code for fast k_t clustering, and more

abstract:
  Two main classes of jet clustering algorithms, cone and k_t, are briefly
discussed. It is argued that the former can be often cumbersome to define and
implement, and difficult to analyze in terms of its behaviour with respect to
soft and collinear emissions. The latter, on the other hand, enjoys a very
simple definition, and can be easily shown to be infrared and collinear safe.
Its single potential shortcoming, a computational complexity believed to scale
like the number of particles to the cube (N^3), is overcome by introducing a
new geometrical algorithm that reduces it to N ln N. A practical implementation
of this approach to k_t-clustering, FastJet, is shown to be orders of magnitude
faster than all other present codes, opening the way to the use of
k_t-clustering even in highly populated heavy ion events.


title:
Extended double seesaw model for neutrino mass spectrum and low scale
  leptogenesis

abstract:
  We consider a variant of seesaw mechanism by introducing extra singlet
neutrinos, with which we show how the low scale leptogenesis is realized
without imposing the tiny mass splitting between two heavy Majorana neutrinos
required in the resonant leptogenesis. Thus, we can avoid the so-called
gravitino problem when our scenario is supersymmetrized. We show that an
introduction of the new singlet fermion leads to a new contribution which can
enhance the lepton asymmetry for certain range of parameter space. We also
examine how both the light neutrino mass spectrum and relatively light sterile
neutrinos of order a few 100 MeV can be achieved without being in conflict with
the constraints on the mixing between the active and sterile neutrinos.


title: A description of the target wave-function encoded in the source terms

abstract:
  We argue that the gauge invariant source terms in the formalism of the Color
Glass Condensate (CGC) should properly describe the target wave-function if the
microscopic structure is concerned in the regime where the parton distribution
is not quite dense. The quantum property of color charge density is
incorporated in the quantum weight function defined with the source terms. We
sketch that the logarithmic source terms encompass a meaningful picture of the
microscopic structure of the target wave-function.


title: Implications of Fritzsch-like lepton mass matrices

abstract:
  Using seesaw mechanism and Fritzsch-like texture 6 zero and 5 zero lepton
Dirac mass matrices, detailed predictions for cases pertaining to
normal/inverted hierarchy as well as degenerate scenario of neutrino masses
have been carried out. All the cases considered here pertaining to inverted
hierarchy and degenerate scenario of neutrino masses are ruled out by the
existing data. For the normal hierarchy cases, the lower limit of m_{\nu 1} and
of s_{13} as well as the range of Dirac-like CP violating phase \delta would
have implications for the texture 6 zero and texture 5 zero cases considered
here.


title: Nucleon matrix elements and baryon masses in the Dirac orbital model

abstract:
  Using the expansion of the baryon wave function in a series of products of
single quark bispinors (Dirac orbitals), the nonsinglet axial and tensor
charges of a nucleon are calculated. The leading term yields $g_A = 1.27$ in
good agreement with experiment. Calculation is essentially parameter-free and
depends only on the strong coupling constant value $\alpha_s$. The importance
of lower Dirac bispinor component, yielding 18% to the wave function
normalization is stressed. As a check, the baryon decuplet masses in the
formalism of this model are also computed using standard values of the string
tension $\sigma$ and the strange quark mass $m_s$; the results being in a good
agreement with experiment.


title: Axino Light Dark Matter and Neutrino Masses with R-parity Violation

abstract:
  Motivated by the recent observation of the 511 keV $\gamma$-ray line
emissions from the galactic bulge and an explanation for it by the decays of
light dark matter particles, we consider the light axino whose mass can be in
the 1-10 MeV range, particularly, in the context of gauge-mediated
supersymmetry breaking models. We discuss the production processes and
cosmological constraints for the light axino dark matter. It is shown that the
bilinear R-parity violating terms provide an appropriate mixing between the
axino and neutrinos so that the light axino decays dominantly to $e^+ e^- \nu$.
We point out that the same bilinear R-parity violations consistently give both
the lifetime of the axino required to explain the observed 511 keV
$\gamma$-rays and the observed neutrino masses and mixing.


title: On the existence of heavy tetraquarks

abstract:
  Previous work done in collaboration with David Brink is reviewed in the light
of the recent observation of new charmonium-like resonances which can be
interpreted as tetraquarks. In the framework of a schematic quark model the
spectrum of $c \bar c q \bar q $ tetraquarks is presented


title:
High energy neutrino in a nuclear environment: mirror asymmetry of the
  shadowing effect

abstract:
  The parity non-conservation effect in diffractive charged current DIS is
quantified in terms of color dipole sizes of left-handed and right-handed
electroweak bosons. We identify the origin and estimate the strength of the
left-right asymmetry effect and present comparison with experimental data on
the parity-odd structure function $\Delta xF_3 =xF_3^{\nu N}-xF_3^{\bar\nu N}$.
We study the shadowing effect in absorption of left-handed and right-handed
$W$-bosons by atomic nuclei. The target nucleus is found to be quite
transparent for the charmed-strange Fock component of the light-cone $W^+$ in
the helicity state $\lambda=+1$ and rather opaque for the $c\bar s$ dipole with
$\lambda=-1$.


title: Entropy of expanding QCD matter

abstract:
  Using the lattice QCD equation of state for an isentropically expanding
fireball we follow the evolution of the effective number of particles in an
ideal gas pV/T. This number reduces roughly to its third around the crossover
temperature, which helps to circumvent the entropy obstacle inherent in quark
coalescence models of the hadronization.


title: Phase-shift analysis of low-energy $\pi^{\pm}p$ elastic-scattering data

abstract:
  Using electromagnetic corrections previously calculated by means of a
potential model, we have made a phase-shift analysis of the $\pi^\pm p$
elastic-scattering data up to a pion laboratory kinetic energy of 100 MeV. The
hadronic interaction was assumed to be isospin invariant. We found that it was
possible to obtain self-consistent databases by removing very few measurements.
A pion-nucleon model was fitted to the elastic-scattering database obtained
after the removal of the outliers. The model-parameter values showed an
impressive stability when the database was subjected to different criteria for
the rejection of experiments. Our result for the pseudovector $\pi N N$
coupling constant (in the standard form) is $0.0733 \pm 0.0014$. The six
hadronic phase shifts up to 100 MeV are given in tabulated form. We also give
the values of the s-wave scattering lengths and the p-wave scattering volumes.
Big differences in the s-wave part of the interaction were observed when
comparing our hadronic phase shifts with those of the current GWU solution. We
demonstrate that the hadronic phase shifts obtained from the analysis of the
elastic-scattering data cannot reproduce the measurements of the $\pi^- p$
charge-exchange reaction, thus corroborating past evidence that the hadronic
interaction violates isospin invariance. Assuming the validity of the result
obtained within the framework of chiral perturbation theory, that the mass
difference between the $u$- and the $d$-quark has only a very small effect on
the isospin invariance of the purely hadronic interaction, the
isospin-invariance violation revealed by the data must arise from the fact that
we are dealing with a hadronic interaction which still contains residual
effects of electromagnetic origin.


title: Wroclaw neutrino event generator

abstract:
  A neutrino event generator developed by the Wroclaw Neutrino Group is
described. The physical models included in the generator are discussed and
illustrated with the results of simulations. The considered processes are
quasi-elastic scattering and pion production modelled by combining the $\Delta$
resonance excitation and deep inelastic scattering.


title: Measurement of Renyi entropies in multiparticle production: a DO-LIST II

abstract:
  Recently suggested method of measuring Renyi entropies of multiparticle
systems produced in high-energy collisions is presented in the form of a
"do-list", explaining explicitely how to perform the measurement and suggesting
improvements in the treatment of the data.


title: Hybrid mesons and auxiliary fields

abstract:
  Hybrid mesons are exotic mesons in which the color field is not in the ground
state. Their understanding deserves interest from a theoretical point of view,
because it is intimately related to nonperturbative aspects of QCD. Moreover,
it seems that some recently detected particles, such as the $\pi_1(1600)$ and
the Y(4260), are serious hybrid candidates. In this work, we investigate the
description of such exotic hadrons by applying the auxiliary fields technique
to the widely used spinless Salpeter Hamiltonian with appropriate linear
confinement. Instead of the usual numerical resolution, this technique allows
to find simplified analytical mass spectra and wave functions of the
Hamiltonian, which still lead to reliable qualitative predictions. We analyse
and compare two different descriptions of hybrid mesons, namely a two-body
$q\bar q$ system with an excited flux tube, or a three-body $q\bar q g$ system.
We also compute the masses of the $1^{-+}$ hybrids. Our results are shown to be
in satisfactory agreement with lattice QCD and other effective models.


title:
Sensitive polarimetric search for relativity violations in gamma-ray
  bursts

abstract:
  We show that the recent measurements of linear polarization in gamma rays
from GRB 930131 and GRB 960924 constrain certain types of relativity violations
in photons to less than parts in 10^{37}, representing an improvement in
sensitivity by a factor of 100,000.


title:
Measuring Modular Weights in Mirage Unification Models at the LHC and
  ILC

abstract:
  String compactification with fluxes yields MSSM soft SUSY breaking terms that
receive comparable contributions from modulus and anomaly mediation whose
relative strength is governed by a phenomenological parameter $\alpha$. Gaugino
and first/second generation (and sometimes also Higgs and third generation)
scalar mass parameters unify at a mirage unification scale $Q \not= M_{\rm
GUT}$, determined by the value of $\alpha$. The ratio of scalar to gaugino
masses at this mirage unification scale depends directly on the scalar field
modular weights, which are fixed in turn by the brane or brane intersections on
which the MSSM fields are localized. We outline a program of measurements which
can in principle be made at the CERN LHC and the International Linear $e^+e^-$
collider (ILC) which can lead to a determination of the modular weights.


title: Determining Supersymmetric Parameters With Dark Matter Experiments

abstract:
  In this article, we explore the ability of direct and indirect dark matter
experiments to not only detect neutralino dark matter, but to constrain and
measure the parameters of supersymmetry. In particular, we explore the
relationship between the phenomenological quantities relevant to dark matter
experiments, such as the neutralino annihilation and elastic scattering cross
sections, and the underlying characteristics of the supersymmetric model, such
as the values of mu (and the composition of the lightest neutralino), m_A and
tan beta. We explore a broad range of supersymmetric models and then focus on a
smaller set of benchmark models. We find that by combining astrophysical
observations with collider measurements, mu can often be constrained far more
tightly than it can be from LHC data alone. In models in the A-funnel region of
parameter space, we find that dark matter experiments can potentially determine
m_A to roughly +/-100 GeV, even when heavy neutral MSSM Higgs bosons (A, H_1)
cannot be observed at the LHC. The information provided by astrophysical
experiments is often highly complementary to the information most easily
ascertained at colliders.


title: The Casimir Force in a Lorentz Violating Theory

abstract:
  We study the effects of the minimal extension of the standard model including
Lorentz violation on the Casimir force between two parallel conducting plates
in vacuum. We provide explicit solutions for the electromagnetic field using
scalar field analogy, for both the cases in which the Lorentz violating terms
come from the CPT-even or CPT-odd terms. We also calculate the effects of the
Lorentz violating terms for a fermion field between two parallel conducting
plates and analyze the modifications of the Casimir force due to the
modifications of the Dirac equation. In all cases under consideration, the
standard formulas for the Casimir force are modified by either multiplicative
or additive correction factors, the latter case exhibiting different dependence
on the distance between the plates.


title: Determining fundamental parameters of QCD on the lattice

abstract:
  We summarize the status of determinations of fundamental parameters of QCD by
the ALPHA Collaboration.


title: How can the Odderon be detected at RHIC and LHC

abstract:
  The Odderon remains an elusive object, 33 years after its invention. The
Odderon is now a fundamental object in QCD and CGC and it has to be found
experimentally if QCD and CGC are right. In the present paper, we show how to
find it at RHIC and LHC. The most spectacular signature of the Odderon is the
predicted difference between the differential cross-sections for proton-proton
and antiproton-proton at high s and moderate t. The experiment can be done by
using the STAR detector at RHIC and by combining these future data with the
already present UA4/2 data. The Odderon could also be found by ATLAS
exeperiment at LHC by performing a high-precision measurement of the real part
of the hadron elastic scattering amplitude at small t.


title: Gravitational Gauge Mediation

abstract:
  It is often the case that the naive introduction of the messenger sector to
supersymmetry breaking models causes restoration of supersymmetry. We discuss a
possibility of stabilizing the supersymmetry breaking vacuum by gravitational
interaction.


title:
Nearly Tri-bimaximal Neutrino Mixing and CP Violation from mu-tau
  Symmetry Breaking

abstract:
  Assuming the Majorana nature of massive neutrinos, we generalize the
Friedberg-Lee neutrino mass model to include CP violation in the neutrino mass
matrix $M^{}_\nu$. We show that a favorable neutrino mixing pattern (with
$\theta^{}_{12} \approx 35.3^\circ$, $\theta^{}_{23} = 45^\circ$,
$\theta^{}_{13} \neq 0^\circ$ and $\delta = 90^\circ$) can naturally be derived
from $M^{}_\nu$, if it has an approximate or softly-broken $\mu$-$\tau$
symmetry. We point out a different way to obtain the nearly tri-bimaximal
neutrino mixing with $\delta = 0^\circ$ and non-vanishing Majorana phases. The
most general case, in which all the free parameters of $M^{}_\nu$ are complex
and the resultant neutrino mixing matrix contains both Dirac and Majorana
phases of CP violation, is also discussed.


title:
Vacuum energy reduction through destabilization: a unification of
  quintessence and a dynamical approach?

abstract:
  Although quintessence cosmologies seem to explain the amount of cosmological
constant today, the required conditions are severe. For example, an extremely
slowly varying and light scalar field that rolls toward the vanishing vacuum
energy state is needed, which must satisfy the required initial conditions so
that the energy density in matter is comparable to the energy density stored in
quintessence today. Our first question is whether it is possible to explain why
quintessence ``knows'' that the Universe is going toward the vanishing energy
state. We show from a new perspective that the conventional $O(H)$ corrections
may reproduce the required potential. Our second question is whether it is
possible to obtain plausible amount of the potential energy density today
without tuning initial conditions. Since our resultant potentials mimic
quintessence, one may solve the coincidence problem using the conventional
techniques for solving the coincidence problem in quintessence cosmology.
However, in our scenario we have another option, which is qualitatively
different from the one that have been discussed in quintessence cosmology.
Besides quintessence cosmology, we show that there is a relation between a
dynamical approach, which suggests that we can solve the coincidence problem in
a dynamical approach. As far as we know, this is the first attempt to discuss
about the unified picture and the important relations between these distinctive
scenarios.


title: A tetraquark model for the new X(1576) K+ K- resonance

abstract:
  We discuss the likely tetraquark interpretation of the X(1576) K+ K-
isovector resonance recently reported by BES with J^{PC}=1^{--}. We point out
that if this interpretation as a four-quark state is correct, the (s u sbar
dbar) tetraquark decays might have striking signatures. We also provide
predictions for possible analogous tetraquarks involving heavy quarks - (c q
cbar qbar) and (b q bbar qbar).


title: U-boson detectability, and Light Dark Matter

abstract:
  The possible existence of a new gauge boson U, light and very weakly coupled,
allows for Light Dark Matter particles, which could also be at the origin of
the 511 keV line from the galactic bulge. Independently of dark matter, and
taking into account possible Z-U mixing effects, we show that, even under
favorable circumstances (no axial couplings leading to an axionlike behavior or
extra parity-violation effects, very small coupling to neutrinos), and using
reasonable assumptions (no cancellation effect in g(mu)-2, lepton
universality), the U coupling to electrons can be at most as large as ~ 1.5
10^-3 (for m(U) < m(mu)), and is likely to be smaller (e.g. <~ 3 10^-6 m(U)
(MeV), if the U couplings to neutrinos and electrons are similar). This
restricts significantly the detectability of a light U in e+e- --> gamma U, in
particular. U exchanges can still provide annihilation cross sections of LDM
particles of the appropriate size, even if this may require that light dark
matter be relatively strongly self-interacting.


title:
Far Field Monitoring of Rogue Nuclear Activity with an Array of Large
  anti-neutrino Detectors

abstract:
  The result of a study on the use of an array of large anti-neutrino detectors
for the purpose of monitoring rogue nuclear activity is presented. Targeted
regional monitoring of a nation bordering large bodies of water with no
pre-existing legal nuclear activity may be possible at a cost of about several
billion dollars, assuming several as-yet-untested schemes pan out in the next
two decades. These are: (1) the enabling of a water-based detector to detect
reactor anti-neutrinos by doping with GdCl$_3$; (2) the deployment of a
KamLAND-like detector in a deep-sea environment; and (3) the scaling of a
Super-Kamiokande-like detector to a size of one or more megatons. The first may
well prove feasible, and should be tested by phase-III Super-Kamiokande in the
next few years. The second is more of a challenge, but may well be tested by
the Hanohano collaboration in the coming decade. The third is perhaps the least
certain, with no schedule for construction of any such device in the
foreseeable future. In addition to the regional monitoring scheme, several
global, untargeted monitoring schemes were considered. All schemes were found
to fail benchmark sensitivity levels by a wide margin, and to cost at least
several trillion dollars.


title:
Some issues about neutrino processes in color superconducting quark
  matter

abstract:
  Several relevant issues in computing neutrino emissivity in Urca processes in
color superconducting quark matter are addressed. These include: (1) The
constraint on $u$ quark abundance is given from electric neutrality and the
triangle relation among Fermi momenta for participants. (2) The phase space
defined by Fermi momentum reduction of quarks is discussed in QCD and NJL
model. (3) Fermi effective model of weak interaction is reviewed with special
focus on its form in Nambu-Gorkov basis.


title:
Signatures for Black Hole production from hadronic observables at the
  Large Hadron Collider

abstract:
  The concept of Large Extra Dimensions (LED) provides a way of solving the
Hierarchy Problem which concerns the weakness of gravity compared with the
strong and electro-weak forces. A consequence of LED is that miniature Black
Holes (mini-BHs) may be produced at the Large Hadron Collider in p+p
collisions. The present work uses the CHARYBDIS mini-BH generator code to
simulate the hadronic signal which might be expected in a mid-rapidity particle
tracking detector from the decay of these exotic objects if indeed they are
produced. An estimate is also given for Pb+Pb collisions.


title:
Distribution of multiple scatterings in proton-nucleus collisions at
  high energy

abstract:
  We consider proton-nucleus collisions at high energy in the Color Glass
Condensate framework, and extract from the gluon production cross-section the
probabilities of having a definite number of multiple scatterings in the
nucleus. Various properties of the distribution of the number of multiple
scatterings are studied, and we conclude that events in which the momentum of a
hard jet is compensated by many much softer particles on the opposite side are
very unlikely except for extreme values of the saturation momentum. In the same
framework, we also investigate the possibility to estimate the impact parameter
of a proton-nucleus collision, from the measure of the multiplicity of its
final state.


title:
The dual parameterization of the proton generalized parton distribution
  functions H and E and description of the DVCS cross sections and asymmetries

abstract:
  We develop the minimal model of a new leading order parameterization of GPDs
introduced by Shuvaev and Polyakov. The model for GPDs H and E is formulated in
terms of the forward quark distributions, the Gegenbauer moments of the D-term
and the forward limit of the GPD E. The model is designed primarely for small
and medium-size values of x_B, x_B \leq 0.2.
  We examined two different models of the t-dependence of the GPDs: The
factorized exponential model and the non-factorized Regge-motivated model.
Using our model, we successfully described the DVCS cross section measured by
H1 and ZEUS, the moments of the beam-spin A_{LU}^{\sin \phi}, beam-charge
A_{C}^{\cos \phi} and transversely-polarized target A_{UT}^{\sin \phi \cos
\phi} DVCS asymmetries measured by HERMES and A_{LU}^{\sin \phi} measured by
CLAS. The data on A_{C}^{\cos \phi} prefers the Regge-motivated model of the
t-dependence of the GPDs. The data on A_{UT}^{\sin \phi \cos \phi} indicates
that the u and d quarks carry only a small fraction of the proton total angular
momentum.


title: Meson-baryon scattering lengths in HB$\chi$PT

abstract:
  We calculate the chiral corrections to the s-wave pseudoscalar meson
octet-baryon scattering lengths $a_{MB}$ to ${\cal O}(p^3)$ in the SU(3) heavy
baryon chiral perturbation theory (HB$\chi$PT). Hopefully the obtained
analytical expressions will be helpful in the chiral extrapolation of these
scattering lengths in the future lattice simulation.


title: Percolation of color sources and critical temperature

abstract:
  We argue that clustering of color sources, leading to the percolation
transition, may be the way to achieve deconfinement in heavy ion collisions.
The critical density for percolation is related to the effective critical
temperature of the thermal bath asociated to the presence of strong color
fields inside the percolating cluster. We find that the temperature is
rapidity, centrality and energy dependent. We emphasize the similarities of
percolation of strings with color glass condensate.


title:
Spontaneous symmetry breaking in the linear sigma model at finite
  chemical potential: One-loop corrections

abstract:
  We investigate spontaneous symmetry breaking within the linear sigma model
with the SU(2)xU(1) internal symmetry at finite chemical potential, which was
suggested as a model for kaon condensation in the CFL phase of dense quark
matter. One-loop corrections to the scalar field effective potential as well as
its propagator are calculated. Particular attention is paid to the type-II
Goldstone boson that appears in the Bose--Einstein condensed phase.
Furthermore, we show that the type-I Goldstone boson -- the superfluid phonon
-- is allowed to decay due to the nonlinearity of its dispersion relation at
high momentum, and determine its decay width.


title:
Low and High Energy Phenomenology of Quark-Lepton Complementarity
  Scenarios

abstract:
  We conduct a detailed analysis of the phenomenology of two predictive see-saw
scenarios leading to Quark-Lepton Complementarity. In both cases we discuss the
neutrino mixing observables and their correlations, neutrinoless double beta
decay and lepton flavor violating decays such as mu -> e gamma. We also comment
on leptogenesis. The first scenario is disfavored on the level of one to two
standard deviations, in particular due to its prediction for U_{e3}. There can
be resonant leptogenesis with quasi-degenerate heavy and light neutrinos, which
would imply sizable cancellations in neutrinoless double beta decay. The decays
mu -> e gamma and tau -> mu gamma are typically observable unless the SUSY
masses approach the TeV scale. In the second scenario leptogenesis is
impossible. It is however in perfect agreement with all oscillation data. The
prediction for mu -> e gamma is in general too large, unless the SUSY masses
are in the range of several TeV. In this case tau -> e gamma and tau -> mu
gamma are unobservable.


title: Combined LHC/ILC analysis of a SUSY scenario with heavy sfermions

abstract:
  We discuss the potential of combined analyses at the Large Hadron Collider
and the planned International Linear Collider to explore low-energy
supersymmetry in a difficult region of the parameter space characterized by
masses of the scalar SUSY particles around 2 TeV. Precision analyses of cross
sections for light chargino production and forward--backward asymmetries of
decay leptons and hadrons at the ILC, together with mass information on chi^0_2
and squarks from the LHC, allow us to determine the underlying fundamental
gaugino/higgsino MSSM parameters and to constrain the masses of the heavy,
kinematically inaccessible sparticles. No assumptions on a specific
SUSY-breaking mechanism are imposed. For this analysis the complete spin
correlations between production and decay processes are taken into account.


title:
Mass Uncertainties of f0(600) and f0(1370) and their Effects on
  Determination of the Quark and Glueball Admixtures of the I=0 Scalar Mesons

abstract:
  Within a nonlinear chiral Lagrangian framework the correlations between the
quark and glueball admixtures of the isosinglet scalar mesons below 2 GeV and
the current large uncertainties on the mass of the f0(600) and the f0(1370) are
studied. The framework is formulated in terms of two scalar meson nonets (a
two-quark nonet and a four-quark nonet) together with a scalar glueball. It is
shown that while some properties of these states are sensitive to the mass of
f0(600) and f0(1370), several relatively robust conclusions can be made: The
f0(600), the f0(980), and the f0(1370) are admixtures of two and four quark
components, with f0(600) being dominantly a non-strange four-quark state, and
f0(980) and f0(1370) having a dominant two-quark component. Similarly, the
f0(1500) and the f0(1710) have considerable two and four quark admixtures, but
in addition have a large glueball component. For each state, a detailed
analysis providing the numerical estimates of all components is given. It is
also shown that this framework clearly favors the experimental values:
m[f0(600)] < 700 MeV and m[f0(1370)] = 1300-1450 MeV. Moreover, an overall fit
to the available data shows a reciprocal substructure for the f0(600) and the
f0(1370), and a linear correlation between their masses of the form m
[f0(1370)] = 0.29 m[f0(600)] + 1.22 GeV. The scalar glueball mass of 1.5-1.7
GeV is found in this analysis.


title: Light Kaluza-Klein States in Randall-Sundrum Models with Custodial SU(2)

abstract:
  We consider Randall-Sundrum scenarios based on SU(2)_L x SU(2)_R and a
discrete parity exchanging L with R. The custodial and parity symmetries can be
used to make the tree level contribution to the T parameter and the anomalous
couplings of the bottom quark to the Z very small. We show that the resulting
quantum numbers typically induce a negative T parameter at one loop that,
together with the positive value of the S parameter, restrict considerably
these models. There are nevertheless regions of parameter space that
successfully reproduce the fit to electroweak precision observables with light
Kaluza-Klein excitations accessible at colliders. We consider models of
gauge-Higgs unification that implement the custodial and parity symmetries and
find that the EW data singles out a very well defined region in parameter
space. In this region one typically finds light gauge boson Kaluza-Klein
excitations as well as light SU(2)_L singlet, and sometimes also doublet,
fermionic states, that mix with the top quark, and may yield interesting
signatures at future colliders.


title:
Gravitational Waves from Phase Transitions at the Electroweak Scale and
  Beyond

abstract:
  If there was a first order phase transition in the early universe, there
should be an associated stochastic background of gravitational waves. In this
paper, we point out that the characteristic frequency of the spectrum due to
phase transitions which took place in the temperature range 100 GeV - 10^7 GeV
is precisely in the window that will be probed by the second generation of
space-based interferometers such as the Big Bang Observer (BBO). Taking into
account the astrophysical foreground, we determine the type of phase
transitions which could be detected either at LISA, LIGO or BBO, in terms of
the amount of supercooling and the duration of the phase transition that are
needed. Those two quantities can be calculated for any given effective scalar
potential describing the phase transition. In particular, the new models of
electroweak symmetry breaking which have been proposed in the last few years
typically have a different Higgs potential from the Standard Model. They could
lead to a gravitational wave signature in the milli-Hertz frequency, which is
precisely the peak sensitivity of LISA. We also show that the signal coming
from phase transitions taking place at T ~ 1-100 TeV could entirely screen the
relic gravitational wave signal expected from standard inflationary models.


title:
Constraints on the form factors for K --> pi l nu and implications for
  V_us

abstract:
  Rigorous bounds are established for the expansion coefficients governing the
shape of semileptonic K-->pi form factors. The constraints enforced by
experimental data from tau-->K pi nu eliminate uncertainties associated with
model parameterizations in the determination of |V_us|. The results support the
validity of a powerful expansion that can be applied to other semileptonic
transitions.


title: Probing Dark Energy via Neutrino & Supernova Observatories

abstract:
  A novel method for extracting cosmological evolution parameters is proposed,
using a probe other than light: future observations of the diffuse
anti-neutrino flux emitted from core-collapse supernovae (SNe), combined with
the SN rate extracted from future SN surveys. The relic SN neutrino
differential flux can be extracted by using future neutrino detectors such as
Gadolinium-enriched, megaton, water detectors or 100-kiloton detectors of
liquid Argon or liquid scintillator. The core-collapse SN rate can be
reconstructed from direct observation of SN explosions using future precision
observatories. Our method, by itself, cannot compete with the accuracy of the
optical-based measurements but may serve as an important consistency check as
well as a source of complementary information. The proposal does not require
construction of a dedicated experiment, but rather relies on future experiments
proposed for other purposes.


title: Scalar Mesons a0(1450) and sigma(600) from Lattice QCD

abstract:
  We study the a0 and sigma mesons with the overlap fermion in the chiral
regime with the pion mass as low as 182 MeV in the quenched approximation.
After the eta'pi ghost states are separated, we find that the a0 mass with
q\bar{q} interpolation field to be almost independent of the quark mass in the
region below the strange quark mass. The chirally extrapolated results are
consistent with a0(1450) being the u\bar{d} meson and K0*(1430) being the
u\bar{s} meson with calculated masses at 1.42+_0.13 GeV and 1.41+_ 0.12 GeV
respectively. We also calculate the scalar mesonium with a tetraquark
interpolation field. In addition to the two pion scattering states, we find a
state at around 550 MeV. Through the study of volume dependence, we confirm
that this state is a one-particle state, in contrast to the two-pion scattering
states. This suggests that the observed state is a tetraquark mesonium which is
quite possibly the sigma(600) meson.


title: Cosmology with Light Axions from Technicolor

abstract:
  We consider cosmological consequences of the spontaneous breaking of a global
symmetry that is anomalous under technicolor interactions, leading to the
emergence of a light axion-like particle. Avoiding overclosure of the universe
by such axions yields the upper bound $f_a \lsim 10^{10}$ GeV on the symmetry
breaking scale, corresponding to keV-scale axions. However, diffuse x-ray
background data typically require larger values of $f_a$. The overclosure and
x-ray bounds can be reconciled if the axion initial amplitude of oscillations
$A_i \sim f_a/10$. In this case, a viable axionic dark matter candidate with a
mass in the 50-100 eV range emerges. The detection of this type of dark matter
may pose a challenge.


title:
A Hybrid Model of Neutrino Masses and Oscillations: Bulk Neutrinos in
  the Split-Fermion Scenario

abstract:
  Higher-dimensional models of neutrino physics with one or more right-handed
neutrinos in the bulk have attracted considerable attention in recent years.
However, a critical issue for such models is to find a way of introducing the
required flavor dependence needed for generating neutrino oscillations. In this
paper, we point out that a natural ``minimal'' framework that accomplishes this
can be constructed by combining the bulk-neutrino hypothesis for right-handed
neutrinos with the split-fermion scenario for left-handed neutrinos. This
combination leads to a unique flavor signature for neutrino phenomenology which
easily incorporates large flavor mixing angles. This hybrid scenario also has a
number of additional important features. For example, one previous difficulty
of the split-fermion scenario applied to neutrinos has been that the mass
matrix is exponentially sensitive to neutrino displacements within the brane.
However, in our hybrid scenario, the interactions between the brane and bulk
naturally convert this dependence from exponential to linear. Another important
feature is that our hybrid scenario provides its own natural regulator for
Kaluza-Klein sums. Thus, in our scenario, all Kaluza-Klein summations are
manifestly finite, even in cases with multiple extra dimensions. But most
importantly, our mechanism completely decouples the effective neutrino flavor
mixing angles from the sizes of the overlaps between the neutrino wavefunctions
within the brane. Thus, we are able to obtain large neutrino mixing angles even
when these neutrinos have significant spatial separations and their overlaps
vanish.


title: B_s^0 - \bar{B}_s^0 Mixing in Leptophobic Z^\prime Model

abstract:
  Leptophobic Z^\prime gauge boson appears naturally in many grand unified
theories, such as flipped SU(5) or string-inspired E_6 models. This elusive
particle easily escapes the direct/indirect detections because it does not
couple to charged leptons. However, it can generate flavor changing neutral
current at tree level. In this letter, we show that the recently measured mass
difference, \Delta m_s, in the B_s^0 -\bar{B}_s^0 system improves the previous
bound of flavor changing effective coupling by about one order of magnitude,
i.e irrespective of its phase, |U_{sb}^{Z^\prime}| \leq 0.036 for M_{Z^\prime}
= 700 GeV, and |U_{sb}^{Z^\prime}| \leq 0.051 for M_{Z^\prime} = 1 TeV.


title: Branching Ratio and CP-asymmetry for B-> 1^{1}P_{1}gamma decays

abstract:
  We calculate the branching ratios for B_{d}^{0}->(b_{1},h_{1})gamma at
next-to-leading order (NLO) of alpha_{s} where b_{1} and h_{1} are the
corresponding radially excited axial vector mesons of rho and omega
respectively. Using the SU(3)symmetry for the form factor, the branching ratio
for B_{d}^{0}->(b_{1},h_{1})gamma is expressed in terms of the branching ratio
of the B_{d}^{0}-> K_{1}gamma and it is found to be
B(B_{d}^{0}->b_{1}gamma)=0.71* 10^{-6} and B(B_{d}^{0}-> h_{1}gamma)
=0.74*10^{-6}. We also calculate direct CP asymmetry for these decays and find,
in confirmity with the observations made in the literature, that the hard
spectator contributions significantely reduces the asymmetry arising from the
vertex corrections alone. The value of CP-asymmetry is 10% and is negative like
rho and omega in the Standard Model.


title: Is Vtb=1 ?

abstract:
  The strongest constraint on Vtb presently comes from the 3 x 3 unitarity of
the CKM matrix, which fixes Vtb to be very close to one. If the unitarity is
relaxed, current information from top production at Tevatron still leaves open
the possibility that Vtb is sizably smaller than one. In minimal extensions of
the standard model with extra heavy quarks, the unitarity constraints are much
weaker and the EW precision parameters entail the strongest bounds on Vtb. We
discuss the experimental perspectives of discovering and identifying such new
physics models at the Tevatron and the LHC, through a precise measurement of
Vtb from the single top cross sections and by the study of processes where the
extra heavy quarks are produced.


title: The Structure Functions and Low x Working Group Summary

abstract: The structure functions and low x working group summary of DIS06.


title: Working Group Report: Heavy-Ion Physics and Quark-Gluon Plasma

abstract:
  This is the report of Heavy Ion Physics and Quark-Gluon Plasma at WHEPP-09
which was part of Working Group-4. Discussion and work on some aspects of
Quark-Gluon Plasma believed to have created in heavy-ion collisions and in
early universe are reported.


title:
Polarized Light Propagating in a Magnetic Field as a Probe of
  Millicharged Fermions

abstract:
  Possible extensions of the standard model of elementary particle physics
suggest the existence of particles with small, unquantized electric charge.
Photon initiated pair production of millicharged fermions in an external
magnetic field would manifest itself as a vacuum magnetic dichroism. We show
that laser polarization experiments searching for this effect yield, in the
mass range below 0.1 eV, much stronger constraints on millicharged fermions
than previously considered laboratory searches. Vacuum magnetic birefringence
originating from virtual pair production gives a slightly better constraint for
masses between 0.1 eV and a few eV. We comment on the possibility that the
vacuum magnetic dichroism observed by PVLAS arises from pair production of such
millicharged fermions rather than from single production of axion-like
particles. Such a scenario can be confirmed or firmly excluded by a search for
invisible decays of orthopositronium with a sensitivity of about 10^(-9) in the
corresponding branching fraction.


title: Explanation to the Problem of the Naturalness measurements

abstract:
  The sensitivity parameter is widely used in measuring the severity of
fine-tuning, while many examples show it doesn't work under certain
circumstances. The validity of the sensitivity is in question. We argue that
the dimensional effect is the reason why it fails in those scenarios. To
guarantee the sensitivity parameter correctly reflects the severity of
fine-tuning, it should be avoided to use under these specific circumstances.


title: Color strings, pomeron shadowing and Color Glass Condensate

abstract:
  I review the problem of parton saturation and its implications through three
in principal different approaches, but somewhat related: saturation in a
geometrical approach, QCD saturation through the Color Glass Condensate and
shadowing in a Pomeron approach.


title:
Resummation of Large Endpoint Corrections to Color-Octet J/psi
  Photoproduction

abstract:
  An unresolved problem in J/psi phenomenology is a systematic understanding of
the differential photoproduction cross section, dsigma/dz [gamma + p -> J/psi +
X], where z= E_psi/E_gamma in the proton rest frame. In the non-relativistic
QCD (NRQCD) factorization formalism, fixed-order perturbative calculations of
color-octet mechanisms suffer from large perturbative and nonperturbative
corrections that grow rapidly in the endpoint region, z -> 1. In this paper,
NRQCD and soft collinear effective theory are combined to resum these large
corrections to the color-octet photoproduction cross section. We derive a
factorization theorem for the endpoint differential cross section involving the
parton distribution function and the color-octet J/psi shape functions. A one
loop matching calculation explicitly confirms our factorization theorem at
next-to-leading order. Large perturbative corrections are resummed using the
renormalization group. The calculation of the color-octet contribution to
dsigma/dz is in qualitative agreement with data. Quantitative tests of the
universality of color-octet matrix elements require improved knowledge of shape
functions entering these calculations as well as resummation of the
color-singlet contribution which accounts for much of the total cross section
and also peaks near the endpoint.


title: The neural network approach to parton distribution functions

abstract:
  We introduce the neural network approach to the parametrization of parton
distributions. After a general introduction, we present in detail our approach
to parametrize experimental data, based on a combination of Monte Carlo methods
and neural networks. We apply this strategy first in three different cases: the
proton structure function, hadronic tau decays and B meson decay spectra.
Finally we describe the neural network approach applied to the parametrization
of parton distribution functions, and present results on the nonsinglet parton
distribution.


title:
Stringent bounds on the brane width from stellar interferometry and
  distant gamma ray bursts: Back to the hierarchy problem?

abstract:
  A simple idea restricting the brane width due to astronomical observations is
proposed. Not to contradict the observational data the brane width should be of
about Planck size giving therefore strict criterion in selecting the realistic
braneworld models.


title: A Three Site Higgsless Model

abstract:
  We analyze the spectrum and properties of a highly-deconstructed Higgsless
model with only three sites. Such a model contains sufficient complexity to
incorporate interesting physics issues related to fermion masses and
electroweak observables, yet remains simple enough that it could be encoded in
a Matrix Element Generator program for use with Monte Carlo simulations. The
gauge sector of this model is equivalent to that of the BESS model; the new
physics of interest here lies in the fermion sector. We analyze the form of the
fermion Yukawa couplings required to produce the ideal fermion delocalization
that causes tree-level precision electroweak corrections to vanish. We discuss
the size of one-loop corrections to b \to s \gamma, the weak-isospin violating
parameter \alpha T and the decay Z \to b \bar{b}. We find that the new
fermiophobic vector states (the analogs of the gauge-boson KK modes in a
continuum model) can be reasonably light, with a mass as low as 380 GeV, while
the extra (approximately vectorial) quark and lepton states (the analogs of the
fermion KK modes) must be heavier than 1.8 TeV.


title:
Saturation Physics in Ultra High Energy Cosmic Rays: Heavy Quark
  Production

abstract:
  In this work we estimate the heavy quark production in the interaction of
ultra high energy cosmic rays in the atmosphere, considering that the primary
cosmic ray is a proton or a photon. At these energies the saturation momentum
Q_{sat}^2 stays above the hard scale \mu_c^2=4m_c^2, implying charm production
probing the saturation regime. In particular, we show that the ep HERA data
presents a scaling on \tau_c = (Q^2+\mu_c^2)/Q_{sat}^2. We derive our results
considering the dipole picture and the Color Glass Condensate formalism, which
one shows to be able to describe the heavy quark production in photon-proton
and proton-proton collisions. Nuclear effects are considered in computation of
cross sections for scattering on air nuclei. Implications on the flux of prompt
leptons at the earth are analyzed and a large suppression is predicted.


title: CGC formalism with two sources

abstract:
  In this work we extend the JIMWLK formalism to the two-source problem. The
S-matrix for the forward scattering can be written in a double functional
integral representation which involves the usual functional integral for the
gluon field and the spin path integral for the external color sources.
Modifications needed in the light-cone gauge are discussed. Using our source
term we compute the produced gluon field and discuss the duality of the high
energy evolution kernel in the pA collision.


title: NLO Event Generation for Chargino Production at the ILC

abstract:
  We present a Monte-Carlo event generator for simulating chargino
pair-production at the International Linear Collider (ILC) at next-to-leading
order in the electroweak couplings. By properly resumming photons in the soft
and collinear regions, we avoid negative event weights, so the program can
simulate physical (unweighted) event samples. Photons are explicitly generated
throughout the range where they can be experimentally resolved. Inspecting the
dependence on the cutoffs separating the soft and collinear regions, we
evaluate the systematic errors due to soft and collinear approximations. In the
resummation approach, the residual uncertainty can be brought down to the
per-mil level, coinciding with the expected statistical uncertainty at the ILC.


title: Gluon propagator in diffractive scattering

abstract:
  In this work, we perform a comparison of the employ of distinct gluon
propagators with the experimental data in diffractive processes, $pp$ elastic
scattering and light meson photo-production. The gluon propagators are
calculated through non-perturbative methods, being justified their use in this
class of events, due to the smallness of the momentum transfer. Our results are
not able to select the best choice for the modified gluon propagator among the
analyzed ones, showing that the application of this procedure in this class of
high energy processes, although giving a reasonable fit to the experimental
data, should be taken with same caution.


title: Flux of Primordial Monopoles

abstract:
  We discuss how in supersymmetric models with D and F-flat directions, a
primordial monopole flux of order 10^{-16} - 10^{-18} cm^{-2} sec^{-1} sr^{-1}
can coexist with the observed baryon asymmetry. A modified Affleck-Dine
scenario yields the desired asymmetry if the monopoles are superheavy (~
10^{13}-10^{18} GeV). For lighter monopoles with masses ~ 10^{9}-10^{12} GeV,
the baryon asymmetry can arise via TeV scale leptogenesis.


title: Backward DVCS and Proton to Photon Transition Distribution Amplitudes

abstract:
  We analyse deeply-virtual Compton scattering on a proton target, gamma* P ->
P' gamma in the backward region and in the scaling regime. We define the
transition distribution amplitudes which describe the proton to photon
transition. Model-independent predictions are given to test this description,
for current or planned experiments at JLab or by Hermes.


title:
The correction of the littlest Higgs model to the Higgs production
  process $e^+e^-\to e^+e^-H$ at the ILC

abstract:
  The littlest Higgs model is the most economical one among various little
Higgs models. In the context of the littlest Higgs model, we study the process
$e^{+}e^{-}\to e^{+}e^{-}H$ at the ILC and calculate the correction of the
littlest Higgs model to the cross section of this process. The results show
that, in the favorable parameter spaces preferred by the electroweak precision
data, the value of the relative correction is in the range from a few percent
to tens percent. In most case, the correction is large enough to reach the
measurement precision of the ILC. Therefore, the correction of the littlest
Higgs model to the process $e^{+}e^{-}\to e^{+}e^{-}H$ might be detected at the
ILC which will give an ideal way to test the model.


title: Hard exclusive reactions and hadron structure

abstract:
  The generalized Bjorken regime of exclusive reactions opens new ways to
explore the hadron structure. We shortly review the present status of this
domain where generalized parton distributions, generalized distribution
amplitudes and transition distribution amplitudes describe various aspects of
confinement physics.


title:
The K^*_0(800) scalar resonance from Roy-Steiner representations of pi K
  scattering

abstract:
  We discuss the existence of the light scalar meson K^*_0(800) (also called
kappa) in a rigorous way, by showing the presence of a pole in the pi K --> pi
K amplitude on the second Riemann sheet. For this purpose, we study the domain
of validity of two classes of Roy-Steiner representations in the complex energy
plane. We prove that one of them is valid in a region sufficiently broad in the
imaginary direction. From this representation, we compute the l=0 partial wave
in the complex plane with neither additional approximation nor model
dependence, relying only on experimental data. A scalar resonance with
strangeness S=1 is found with the following mass and width: E_kappa = 658 \pm
13 MeV and Gamma_kappa = 557 \pm 24 MeV.


title:
On radiative QCD backgrounds to exclusive H -> b bbar production at the
  LHC and a photon collider

abstract:
  Central exclusive Higgs boson production, pp -> p + H + p, at the LHC and
s-channel resonant Higgs production in the photon-collider option of the ILC
can provide a very important contribution to the comprehensive study of the
Higgs sector. Especially attractive is the b bbar Higgs decay mode, which for
certain MSSM scenarios may become the discovery channel in exclusive Higgs
production at the LHC and the Photon Collider (PC). Strongly suppressed and
controllable backgrounds is an obvious requirement for the success of these
exclusive measurements. One of the main sources of background comes from
additional gluon radiation which leads to a three-jet b bbar g final state. We
perform an explicit calculation of the subprocesses gg -> q qbar g and gamma
gamma -> q qbar g, where the incoming particles are required to be in a J_z=0
state and the two gluons form a colour singlet, and investigate the salient
properties of these potentially important background processes.


title:
Structure and decay constant of the \rho meson with Bethe-Salpeter
  equation

abstract:
  In this article, we study the structure of the \rho meson in the framework of
the coupled rainbow Schwinger-Dyson equation and ladder
  Bethe-Salpeter equation with a confining effective potential. The u and d
quark propagators get significantly modified, the mass poles are absent in the
timelike region, which implements confinement naturally. The Bethe-Salpeter
amplitudes of the \rho meson center around zero momentum and extend to the
energy scale about $q^2=1GeV^2$, which happens to be the energy scale of chiral
symmetry breaking, strong interactions in the infrared region result in bound
state. The numerical results of the mass and decay constant of the \rho meson
are in agreement with the experimental data.


title: On Kolmogorov Wave Turbulence in QCD

abstract:
  We investigate Kolmogorov wave turbulence in QCD or, in other words, we
calculate the spectrum of gluons as a function of time, f_k(t), in the presence
of a source which feeds in energy density in the infrared region at a constant
rate. We find an early, an intermediate and a late time form for the gluon
spectrum. Wave turbulence in QCD turns out to be somewhat different than the
turbulence in the case of \phi^4-type theories studied by Zakharov, L'vov and
Falkovich. The hope is that a good understanding of QCD wave turbulence might
lead to a better understanding of the instability problem in the early stages
of the evolution after a heavy ion collision.


title:
Quantum fluctuations of braneworld background versus the TeV fundamental
  scale

abstract:
  Quantum fluctuations of gravitational field with respect to the ADD
braneworld background turns out to be large enough spoiling the TeV scale
physics as well. In view of this observation it becomes important to look for
some protecting mechanism. The most natural such mechanism in the case of
braneworld model with compactified extra dimensions can be the shape moduli of
extra space. Quantum fluctuations of braneworld background affect significantly
the production as well as evaporation of mini black holes studied very actively
during the las few years. The enormous amplification of quantum fluctuations of
the background space-time due to lowering the fundamental scale to the TeV
range, is characteristic to other phenomenological braneworld models as well
and correspondingly calls for attention.


title: Seeing the Invisible Axion in the Sparticle Spectrum

abstract:
  I describe how under favourable circumstances the invisible axion may
manifest its existence at the LHC through the sparticle spectrum; in particular
through a gluino \sim \ln (M_P/m_{3/2}) times heavier than other gauginos.


title:
One-loop helicity amplitudes for H -> gluons: the all-minus
  configuration

abstract:
  We use twistor inspired rules to compute the one-loop amplitude for a Higgs
boson coupling to any number of negative helicity gluons in the large top mass
limit.


title: Two Photon Decays of Charmonia from Lattice QCD

abstract:
  We make the first calculation in lattice QCD of two-photon decays of mesons.
Working in the charmonium sector, using the LSZ reduction to relate a photon to
a sum of hadronic vector eigenstates, we compute form-factors in both the
space-like and time-like domains for the transitions $\eta_c \to \gamma^*
\gamma^*$ and $\chi_{c0} \to \gamma^* \gamma^*$. At the on-shell point we find
approximate agreement with experimental world-average values.


title: Four-Loop Tadpoles: Applications in QCD

abstract:
  Recent applications of single-scale four-loop tadpoles are briefly reviewed.
An algorithm for the evaluation of current correlators based on differential
equations is described and applied to obtain high moments of the vacuum
polarization function at O(alphas^2) as a preparation of O(alphas^3)
calculations.


title: Supersymmetric Model of Radiative Seesaw Majorana Neutrino Masses

abstract:
  The radiative seesaw mechanism proposed recently is minimally extended to
include supersymmetry in a specific model. Relevant related issues such as
leptogenesis and dark matter are discussed.


title: Polarized sea measurements at JPARC

abstract:
  Large double spin-asymmetries can be foreseen for Drell-Yan production in $p
p$ scattering at JPARC energies. The sign of the asymmetries can be used to
discriminate between different model calculations of sea quark distributions.


title: Custodial Symmetry and Extensions of the Standard Model

abstract:
  We show that the extension of the approximate custodial $SU(2)_{L+R}$ global
symmetry to all the Yukawa interactions of the standard model Lagrangian
implies the introduction of sterile right-handed neutrinos and the seesaw
mechanism in this sector. In this framework, the observed quark and lepton
masses may be interpreted as an effect of physics beyond the standard model.
The mechanism used for breaking this symmetry in the Yukawa sector could be
different from the one at work in the vector boson sector. We give three model
independent examples of these mechanisms.


title:
GRBs Neutrinos as a Tool to Explore Quantum Gravity induced Lorentz
  Violation

abstract:
  Lorentz Invariance Violation (LIV) arises in various quantum-gravity
theories. As the typical energy for quantum gravity is the Planck mass,
$M_{pl}$, LIV will, most likely, be manifested at very high energies that are
not accessible on Earth in the foreseeable future. One has to turn to
astronomical observations. Time of flight measurement from different
astronomical sources set current limits on the energy scale of possible LIV to
$> 0.01 M_{pl}$ (for n=1 models) and $> 10^{-9} M_{pl}$ (for n=2). According to
current models Gamma-Ray Bursts (GRBs) are accompanied by bursts of high energy
($\gsim 100$TeV) neutrinos. At this energy range the background level of
currently constructed neutrino detectors is so low that a detection of a single
neutrino from the direction of a GRB months or even years after the burst would
imply an association of the neutrino with the burst and will establish a
measurement of a time of flight delay. Such time of flight measurements provide
the best way to observe (or set limits) on LIV. Detection of a single GRB
neutrino would open a new window on LIV and would improve current limits by
many orders of magnitude.


title: A New Custodian for a Realistic Higgsless Model

abstract:
  We present an example of a realistic Higgsless model that makes use of
alternative $SU(2)_R$ assignments for the top and bottom quarks recently
proposed by Agashe et al. which results in an enhanced custodial symmetry.
Using these new representat ions reduces the deviations in the
$Zb_\ell\bar{b}_\ell$ coupling to $\sim 4%$ for a wide range of parameters,
while this remaining correction can also be eliminated by varying the
localization parameter (bulk mass) for $b_r$.


title: B(s)-B(s)bar Mixing in Supersymmetric Grand Unified Models

abstract:
  We study B_s-\bar{B}_s mixing in grand unified SO(10), SU(5) models where the
mixings among the second and third generation squarks arise due to the
existence of flavor violating sources in the Dirac and Majorana couplings which
are responsible for neutrino mixings. We find that when the branching ratio of
tau->mu gamma decay is enhanced to be around the current experimental bound,
B_s-\bar{B}_s mixing may also contain large contribution from supersymmetry in
the SO(10) boundary condition. Consequently, the phase of B_s-\bar{B}_s mixing
is large (especially for small tan beta and large scalar mass m_0) and can be
tested by measuring CP asymmetries of B_s decay modes.


title: Heavy flavor diffusion in weakly coupled N=4 Super Yang-Mills theory

abstract:
  We use perturbation theory to compute the diffusion coefficient of a heavy
quark or scalar moving in N=4 SU(N_c) Super Yang-Mills plasma to leading order
in the coupling and the ratio T/M<<1. The result is compared both to recent
strong coupling calculations in the same theory and to the corresponding weak
coupling result in QCD. Finally, we present a compact and simple formulation of
the Lagrangian of our theory, N=4 SYM coupled to a massive fundamental N=2
hypermultiplet, which is well-suited for weak coupling expansions.


title: Moriond Electroweak 2006: Theory Summary

abstract:
  A concise look at the big picture of particle physics, including the status
of the Standard Model, neutrinos, supersymmetry, extra dimensions and
cosmology. Based upon the theoretical summary presented at the XLIst Rencontres
de Moriond on Electroweak Interactions and Unified Theories, La Thuile, 11-18
March 2006.


title:
Study of exclusive semileptonic and nonleptonic decays of $B_c^-$ in a
  nonrelativistic quark model

abstract:
  We present results for different observables measured in semileptonic and
non-leptonic decays of the $B_c^-$ meson. The calculations have been done
within the framework of a nonrelativistic constituent quark model. In order to
check the sensitivity of all our results against the inter-quark interaction we
use five different quark--quark potentials. We obtain form factors, decay
widths and asymmetry parameters for semileptonic $B_c^-\to c\bar c$ and
$B_c^-\to \bar B$ decays. In the limit of infinite heavy quark mass our model
reproduces the constraints of heavy quark spin symmetry. For the actual heavy
quark masses we find nonetheless large corrections to that limiting situation
for some form factors. We also analyze exclusive non-leptonic two--meson decay
channels within the factorization approximation.


title:
T-odd correlations in radiative K_l3^+ decays and chiral perturbation
  theory

abstract:
  The charged kaon decay channel K_l3gamma^+ allows for studies of direct CP
violation, possibly due to non-standard mechanisms, with the help of T-odd
correlation variables. In order to be able to extract a CP-violating signal
from experiment, it is necessary to understand all possible standard model
phases that also produce T-odd asymmetries. We complement earlier studies by
considering strong interaction phases in hadronic structure functions that
appear at higher orders in chiral perturbation theory, and compare our findings
to other potential sources of asymmetries.


title: On the relation between low-energy constants and resonance saturation

abstract:
  Although there are phenomenological indications that the low-energy constants
in the chiral lagrangian may be understood in terms of a finite number of
hadronic resonances, it remains unclear how this follows from QCD. One of the
arguments usually given is that low-energy constants are associated with chiral
symmetry breaking, while QCD perturbation theory suggests that at high energy
chiral symmetry is unbroken, so that only low-lying resonances contribute to
the low-energy constants. We revisit this argument in the limit of large Nc,
discussing its validity in particular for the low-energy constant L8, and
conclude that QCD may be more subtle that what this argument suggests. We
illustrate our considerations in a simple Regge-like model which also applies
at finite Nc.


title: Recent developments in perturbative QCD

abstract:
  A brief overview of some recently active topics in perturbative QCD,
including: string-inspired recursion techniques at tree level; recursion
approaches and automation of standard techniques for 1-loop calculations; the
status of NNLO jet calculations; and non-trivial structures that appear in
higher-order calculations.


title: Magnetic monopoles in hot QCD

abstract:
  In this talk we review how a dilute gas of magnetic monopoles in the adjoint
describes the spatial k-Wilson loops. We formulate an effective theory from
  $S_{MQCD}$ by integrating out dof's down to scales in between the magnetic
screening mass and the string tension and relate the 3d pressure and the string
tension. Lattice data are consistent with the gas being dilute for all
temperatures.


title:
Precision measurement of solar neutrino oscillation parameters by a
  long-baseline reactor neutrino experiment in Europe

abstract:
  We consider the determination of the solar neutrino oscillation parameters
$\Delta m^2_{21}$ and $\theta_{12}$ by studying oscillations of reactor
anti-neutrinos emitted by nuclear power plants (located mainly in France) with
a detector installed in the Frejus underground laboratory. The performances of
a water Cerenkov detector of 147 kt fiducial mass doped with 0.1% of Gadolinium
(MEMPHYS-Gd) and of a 50 kt scale liquid scintillator detector (LENA) are
compared. In both cases 3$\sigma$ uncertainties below 3% on $\Delta m^2_{21}$
and of about 20% on $\sin^2\theta_{12}$ can be obtained after one year of data
taking. The Gadolinium doped Super-Kamiokande detector (SK-Gd) in Japan can
reach a similar precision if the SK/MEMPHYS fiducial mass ratio of 1 to 7 is
compensated by a longer SK-Gd data taking time. Several years of reactor
neutrino data collected by MEMPHYS-Gd or LENA would allow a determination of
$\Delta m^2_{21}$ and $\sin^2\theta_{12}$ with uncertainties of approximately
1% and 10% at 3$\sigma$, respectively. These accuracies are comparable to those
that can be reached in the measurement of the atmospheric neutrino oscillation
parameters $\Delta m^2_{31}$ and $\sin^2\theta_{23}$ in long-baseline superbeam
experiments.


title: Multi-Jet Processes in the High Energy Limit of QCD

abstract:
  We discuss how the multi-Regge factorisation of QCD amplitudes can be used in
the study of multi-jet processes at colliders. We describe how the
next-to-leading logarithmic (NLL) BFKL evolution can be combined with energy
and momentum conservation. By recalculating the quark contribution to the
next-to-leading logarithmic corrections to the BFKL kernel we can study several
properties of the NLL corrections. We demonstrate that in the standard
analysis, the NLL corrections to a single gluon emission includes contributions
from significantly more energetic quark--anti-quark configurations, something
that could contribute to the sizable NLL corrections in the standard BFKL
analysis.


title:
The Minimal Phantom Sector of the Standard Model: Higgs Phenomenology
  and Dirac Leptogenesis

abstract:
  We propose the minimal, lepton-number conserving, SU(3)xSU(2)xU(1)
gauge-singlet, or phantom, extension of the Standard Model. The extension is
natural in the sense that all couplings are of O(1) or forbidden due to a
phantom sector global U(1)_D symmetry, and basically imitates the standard
Majorana see-saw mechanism. Spontaneous breaking of the U(1)_D symmetry
triggers consistent electroweak gauge symmetry breaking only if it occurs at a
scale compatible with small Dirac neutrino masses and baryogenesis through
Dirac leptogenesis. Dirac leptogenesis proceeds through the usual
out-of-equilibrium decay scenario, leading to left and right-handed neutrino
asymmetries that do not fully equilibrate after they are produced. The model
contains two physical Higgs bosons and a massless Goldstone boson. The
existence of the Goldstone boson suppresses the Higgs to bb branching ratio and
instead the Higgs bosons will mainly decay to invisible Goldstone and/or to
visible vector boson pairs. In a representative scenario, we estimate that with
30 fb^-1 integrated luminosity, the LHC could discover this invisibly decaying
Higgs, with mass ~120 GeV. At the same time a significantly heavier, partner
Higgs boson with mass ~210 GeV could be found through its vector boson decays.
Electroweak constraints as well as astrophysical and cosmological implications
are analysed and discussed.


title: Gravitational Waves from Warped Spacetime

abstract:
  We argue that the RSI model can provide a strong signature in gravitational
waves. This signal is a relic stochastic background generated during the
cosmological phase transition from an AdS-Schwarschild phase to the RS1
geometry that should occur at a temperature in the TeV range. We estimate the
amplitude of the signal in terms of the parameters of the potential stabilizing
the radion and show that over much of the parameter region in which the phase
transition completes, a signal should be detectable at the planned space
interferometer, LISA.


title: Shape and soft functions of HQET and SCET in the 't Hooft Model

abstract:
  The main application of Heavy Quark Effective Theory (HQET) and of Soft
Collinear Effective Theory (SCET) is in establishing factorization theorems for
exclusive and semi-inclusive decays of heavy mesons. However, the calculation
of the soft factors from the HQET or SCET factorization relations is, as usual,
impeded by the non-perturbative aspect of the strong interactions. In the hope
of gaining some insights into some of these quantities we compute them in the
't Hooft model. We find that the B-meson shape function is exactly given by the
square of the B-meson light-cone wave-function. The structure of the B-pi
structure function is more complicated: it is given by the product of
wave-functions or by a resonant sum depending on the kinematics. The result
simplifies dramatically in the chiral limit, where it can be compared with
general arguments based on Heavy Meson-Chiral Perturbation theory. No attempt
is made to use these results for applications to phenomenology.


title: Possible Effects of a Hidden Valley on Supersymmetric Phenomenology

abstract:
  A hidden valley sector may havea profound impact on the classic phenomenology
of supersymmetry. This occurs if the LSP lies in the valley sector. In addition
to reducing the standard missing energy signals and possibly providing
displaced vertices (phenomena familiar from gauge-mediated and
R-parity-violating models) it may lead to a variable multiplicity of new
neutral particles, whose decays produce soft jets and/or leptons, and perhaps
additional displaced vertices. Combined, these issues might obscure
supersymmetric particle production from search strategies used on current
Tevatron data and planned for the LHC. The same concerns arise more generally
for any model that has a symmetry (such as T-parity or KK-parity) realized
nontrivially in both the standard-model and the hidden-valley sectors. Possible
strategies for experimental detection are discussed, and the potential
importance of the LHCb detector is noted.


title:
Transverse double-spin asymmetries for small $Q_T$ Drell-Yan pair
  production in $pp$ and $p\bar{p}$ collisions

abstract:
  We discuss transverse double-spin asymmetries for dimuon production at small
transverse-momentum $Q_T$ in $pp$ and $p\bar{p}$ collisions. All order
resummation of large logarithms relevant in small $Q_T$ region is performed at
next-to-leading logarithmic (NLL) accuracy, and asymmetries at RHIC, J-PARC and
GSI are calculated.


title:
Vector form factor in K_l3 semileptonic decay with two flavors of
  dynamical domain-wall quarks

abstract:
  We calculate the vector form factor in K \to \pi l \nu semileptonic decays at
zero momentum transfer f_+(0) from numerical simulations of two-flavor QCD on
the lattice. Our simulations are carried out on 16^3 \times 32 at a lattice
spacing of a \simeq 0.12 fm using a combination of the DBW2 gauge and the
domain-wall quark actions, which possesses excellent chiral symmetry even at
finite lattice spacings. The size of fifth dimension is set to L_s=12, which
leads to a residual quark mass of a few MeV. Through a set of double ratios of
correlation functions, the form factor calculated on the lattice is accurately
interpolated to zero momentum transfer, and then is extrapolated to the
physical quark mass. We obtain f_+(0)=0.968(9)(6), where the first error is
statistical and the second is the systematic error due to the chiral
extrapolation. Previous estimates based on a phenomenological model and chiral
perturbation theory are consistent with our result. Combining with an average
of the decay rate from recent experiments, our estimate of f_+(0) leads to the
Cabibbo-Kobayashi-Maskawa (CKM) matrix element |V_{us}|=0.2245(27), which is
consistent with CKM unitarity. These estimates of f_+(0) and |V_{us}| are
subject to systematic uncertainties due to the finite lattice spacing and
quenching of strange quarks, though nice consistency in f_+(0) with previous
lattice calculations suggests that these errors are not large.