title: Resonant production of diquarks at high energy pp, ep and e+e- colliders

abstract:
  Resonant productions of the first generation scalar and vector diquarks at
high energy hadron-hadron (pp), lepton-hadron (ep) and lepton-lepton (e+e-)
colliders are investigated. Taking into account the hadronic component of the
photon, diquarks can be produced resonantly in the lepton-hadron and
lepton-lepton collisions. Production rates, decay widths and signatures of
diquarks are discussed using the general, SU(3)_{C} x SU(2)_{W} x U(1)_{Y}
invariant, effective Lagrangian. The corresponding dijet backgrounds are
examined in the interested invariant mass regions. The attainable mass limits
and couplings are obtained for the diquarks that can be produced in hadron
collisions and in resolved photon processes. It is shown that hadron collider
with center of mass energy sqrt(s)=14 TeV will be able to discover scalar and
vector diquarks with masses up to m_{DQ}=9 TeV for quark-diquark-quark coupling
alpha_{DQ}=0.1. Relatively, lighter diquarks can be probed at ep and e+e-
collisions in more clear environment.


title: Stability of domain walls coupled to Abelian gauge fields

abstract:
  Rozowsky, Volkas and Wali recently found interesting numerical solutions to
the field equations for a gauged U1xU1 scalar field model. Their solutions
describe a reflection-symmetric domain wall with scalar fields and coupled
gauge configurations that interpolate between constant magnetic fields on one
side of the wall and exponentially decaying ones on the other side. This
corresponds physically to an infinite sheet of supercurrent confined to the
domain wall with a linearly rising gauge potential on one side and Meissner
suppression on the other. While it was shown that these static solutions
satisfied the field equations, their stability was left unresolved. In this
paper, we analyse the normal modes of perturbations of the static solutions to
demonstrate their perturbative stability.


title: Thermalisation in Thick Wall Electroweak Baryogenesis

abstract:
  In models of thick wall electroweak baryogenesis a common assumption is that
the plasma interacting with the expanding Higgs bubble wall during the
electroweak phase transition is in kinetic equilibrium (or close to it). We
point out that, in addition to the requirement of low wall velocity, kinetic
equilibrium requires that the change in the momentum of the particles due to
the force exerted by the wall should be much less than that due to scattering
as the plasma passes through the wall. We investigate whether this condition is
satisfied for charginos and neutralinos participating in thick wall
supersymmetric electroweak baryogenesis


title: Baryogenesis with Superheavy Squarks

abstract:
  We consider a setup where R-parity is violated in the framework of split
supersymmetry. The out-of-equilibrium decays of heavy squarks successfully lead
to the generation of a baryon asymmetry. We restrict the R-parity violating
couplings to the baryon number violating subset to keep the neutralino
sufficiently stable to provide the dark matter. The observed baryon asymmetry
can be generated for squark masses larger than 10^11 GeV, while neutralino dark
matter induces a stronger bound of 10^13 GeV. Some mass splitting between left-
and right-handed squarks may be needed to satisfy also constraints from gluino
cosmology.


title:
Higher Derivative Operators as Counterterms in Orbifold
  Compactifications

abstract:
  In the context of 5D N=1 supersymmetric models compactified on S_1/Z_2 or
S_1/(Z_2 x Z_2') orbifolds and with brane-localised superpotential, higher
derivative operators are generated radiatively as one-loop counterterms to the
mass of the (brane or zero mode of the bulk) scalar field. It is shown that the
presence of such operators which are brane-localised is not related to the
mechanism of supersymmetry breaking considered (F-term, discrete or continuous
Scherk-Schwarz breaking) and initial supersymmetry does not protect against the
dynamical generation of such operators. Since in many realistic models the
scalar field is commonly regarded as the Higgs field, and the higher derivative
operators seem a generic presence in orbifold compactifications, we stress the
importance of these operators for solving the hierarchy problem.


title: Pentaquark Theta^+ production via gamma N ->K^*bar Theta^+(3/2^(+-))

abstract:
  We study the photoproduction of the exotic pentaquark Theta^+ baryon with the
vector kaon, assuming that the quantum numbers of the Theta^+ to be
J^P=3/2^(+-) and J^P=1/2^+. Scalar meson kappa(800)-exchange is also taken into
account. In contrast with the gamma N -> Kbar Theta^+(3/2^(+-)) process, the
large suppression from the proton target is not observed in the total cross
sections. We also suggest a method to determine which meson exchange is the
most dominant by analyzing the polarizations of incident photon and outgoing
K^*. We find that kappa-exchange turns out to be prominent when the
polarizations of the photon and K^* are aligned to be parallel, whereas
K-exchange does when they are perpendicular to each other.


title:
Meson-loop contributions to the quark condensate from the instanton
  vacuum

abstract:
  We investigate the quark condensate of the QCD vacuum within the instanton
vacuum model. We calculate the meson-loop contributions to the dynamical quark
mass and quark condensate to ${\cal O}(1/N_c)$-, ${\cal O}(m/N_c)$-, and ${\cal
O}((m\ln m) /N_c)$-order corrections. We find that the meson (especially pion)
loops provide substantial contributions to the dynamical quark mass and as a
result to the quark condensate. The results indicate that the $1/N_c$
corrections should be reconsidered in the systematical way. The present results
are consistent with those from chiral perturbation theory.


title: Harmonic polylogarithms for massive Bhabha scattering

abstract:
  One- and two-dimensional harmonic polylogarithms, HPLs and GPLs, appear in
calculations of multi-loop integrals. We discuss them in the context of
analytical solutions for two-loop master integrals in the case of massive
Bhabha scattering in QED. For the GPLs we discuss analytical representations,
conformal transformations, and also their transformations corresponding to
relations between master integrals in the s- and t-channel.


title: Aspects of thermal leptogenesis in braneworld cosmology

abstract:
  The mechanism of thermal leptogenesis is investigated in the high-energy
regime of braneworld cosmology. Within the simplest seesaw framework with
hierarchical heavy Majorana neutrinos, we study the implications of the
modified Friedmann equation on the realization of this mechanism. In contrast
with the usual leptogenesis scenario of standard cosmology, where low-energy
neutrino data favors a mildly strong washout regime, we find that leptogenesis
in the braneworld regime is successfully realized in a weak washout regime.
Furthermore, a quasi-degenerate light neutrino mass spectrum is found to be
compatible with this scenario. For an initially vanishing heavy Majorana
neutrino abundance, thermal leptogenesis in the brane requires the decaying
heavy Majorana neutrino mass to be M1 > 10^10 GeV and the fundamental
five-dimensional gravity scale 10^12 < M5 < 10^16 GeV, which corresponds to a
transition from brane to standard cosmology at temperatures 10^8 < Tt < 10^14
GeV.


title: Constraint equations for heavy-to-light currents in SCET

abstract:
  A complete basis for the next-to-next-to leading order heavy-to-light
currents in the soft-collinear effective theory is constructed.
Reparameterization invariance is imposed by deriving constraint equations.
Their solutions give the set of allowed Dirac structures as well as relations
between the Wilson coefficients of operators that appear at different orders in
the power expansion. The completeness of reparameterization invariance
constraints derived on a projected surface is investigated. We also discuss the
universality of the ultrasoft Wilson line with boundary conditions.


title: q_T Uncertainties for W and Z Production

abstract:
  Analysis of semi-inclusive DIS hadroproduction suggests broadening of
transverse momentum distributions at small x below 1E-3 ~ 1E-2 which can be
modeled in the Collins-Soper-Sterman formalism by a modification of impact
parameter dependent parton densities. We investigate these consequences for the
production of electroweak bosons at the Tevatron and the LHC. If substantial
small-x broadening is observed in forward Z boson production in the Tevatron
Run-2, it will strongly affect the predicted q_T distributions for W and Z
boson production at the LHC.


title: Heavy Quark Parton Distribution Functions

abstract:
  We present the CTEQ6HQ parton distribution set which is determined in the
general variable flavor number scheme which incorporates heavy flavor mass
effects; hence, this set provides advantages for precision observables which
are sensitive to charm and bottom quark masses. We describe the analysis
procedure, examine the predominant features of the new distributions, and
compare with previous distributions. We also examine the uncertainties of the
strange quark distribution and how the the recent NuTeV dimuon data constrains
this quantity.


title:
Fit to the Bjorken, Ellis-Jaffe and Gross-Llewellyn-Smith sum rules in a
  renormalon based approach

abstract:
  We study the large order behaviour in perturbation theory of the Bjorken,
Ellis-Jaffe and Gross-Llewellyn-Smith sum rules. In particular, we consider
their first infrared renormalons, for which we obtain their analytic structure
with logarithmic accuracy and also an approximate determination of their
normalization constant. Estimates of higher order terms of the perturbative
series are given. The Renormalon subtracted scheme is worked out for these
observables and compared with experimental data. Overall, good agreement with
experiment is found. This allows us to obtain {\hat a}_0 and some higher-twist
non-perturbative constants from experiment: {\hat a}_0=0.141\pm 0.089;
f_{3,RS}(1 GeV)=-0.124^{+0.137}_{-0.142} GeV^2.


title:
On the behaviour of single scale hard small $x$ processes in QCD near
  the black disc limit

abstract:
  We argue that at sufficiently small Bjorken $x$ where pQCD amplitude rapidly
increases with energy and violates probability conservation the shadowing
effects in the single-scale small $x$ hard QCD processes can be described by an
effective quantum field theory of interacting quasiparticles. The
quasiparticles are the perturbative QCD ladders. We find, within the WKB
approximation, that the smallness of the QCD coupling constant ensures the
hierarchy among many-quasiparticle interactions evaluated within physical
vacuum and in particular, the dominance in the Lagrangian of the triple
quasiparticle interaction. It is explained that the effective field theory
considered near the perturbative QCD vacuum contains a tachyon relevant for the
divergency of the perturbative QCD series at sufficiently small $x$. We solve
the equations of motion of the effective field theory within the WKB
approximation and find the physical vacuum and the transitions between the
false (perturbative) and physical vacua. Classical solutions which dominate
transitions between the false and physical vacua are kinks that cannot be
decomposed into perturbative series over the powers of $\alpha_s$. These kinks
lead to color inflation and the Bose-Einstein condensation of quasiparticles.
The account of the quantum fluctuations around the WKB solution reveals the
appearance of the "massless" particles-- "phonons". It is explained that
"phonons" are relevant for the black disc behaviour of small $x$ processes,
leading to a Froissart rise of the cross-section. The condensation of the
ladders produces a color network occupying a "macroscopic" longitudinal volume.
We discuss briefly the possible detection of new QCD effects.


title:
Color Ferromagnetism of Quark Matter ; a Possible Origin of Strong
  Magnetic Field in Magnetars

abstract:
  We show a possibility that strong ``magnetic field'' $\sim 10^{15} $G is
produced by color ferromagnetic quark matter in neutron stars. In the quark
matter a color magnetic field is generated spontaneously owing to Savvidy
mechanism and a gluon condensate arises for the stabilization of the field.
Since the quark matter is electrically charged in the neutron stars, the
rotation of the quarks around the color magnetic field produces the strong
``magnetic field''.


title:
Ultra-Relativistic Expansion of Ideal Fluid with Linear Equation of
  State

abstract:
  We study solutions of the relativistic hydrodynamical equations, which
describe spherical or cylindrical expansion of ideal fluid. We derived
approximate solutions involving two arbitrary functions, which describe
asymptotic behavior of expanding fireballs in ultra-relativistic limit. In case
of a sufficiently stiff linear equation of state the solution may be
represented in form of an asymptotic series.


title:
Higher Derivative Operators from Scherk-Schwarz Supersymmetry Breaking
  on T^2/Z_2

abstract:
  In orbifold compactifications on T^2/Z_2 with Scherk-Schwarz supersymmetry
breaking, it is shown that (brane-localised) superpotential interactions and
(bulk) gauge interactions generate at one-loop higher derivative counterterms
to the mass of the brane (or zero-mode of the bulk) scalar field. These
brane-localised operators are generated by integrating out the bulk modes of
the initial theory which, although supersymmetric, is nevertheless
non-renormalisable. It is argued that such operators, of non-perturbative
origin and not protected by non-renormalisation theorems, are generic in
orbifold compactifications and play a crucial role in the UV behaviour of the
two-point Green function of the scalar field self-energy. Their presence in the
action with unknown coefficients prevents one from making predictions about
physics at (momentum) scales close to/above the compactification scale(s). Our
results extend to the case of two dimensional orbifolds, previous findings for
S^1/Z_2 and S^1/(Z_2 x Z_2') compactifications where brane-localised higher
derivative operators are also dynamically generated at loop level, regardless
of the details of the supersymmetry breaking mechanism. We stress the
importance of these operators for the hierarchy and the cosmological constant
problems in compactified theories.


title:
Uncertainties of the Inclusive Higgs Production Cross Section at the
  Tevatron and the LHC

abstract:
  We study uncertainties of the predicted inclusive Higgs production cross
section due to the uncertainties of parton distribution functions (PDF).
Particular attention is given to bbH Yukawa coupling enhanced production
mechanisms in beyond SM scenarios, such as MSSM. The PDF uncertainties are
determined by the robust Lagrange Multiplier method within the CTEQ global
analysis framework. We show that PDF uncertainties dominate over theoretical
uncertainties of the perturbative calculation (usually estimated by the scale
dependence of the calculated cross sections), except for low Higgs masses at
LHC. Thus for the proper interpretation of any Higgs signal, and for better
understanding of the underlying electroweak symmetry breaking mechanism, it is
important to gain better control of the uncertainties of the PDFs.


title: The impact of QCD plasma instabilities on bottom-up thermalization

abstract:
  QCD plasma instabilities, caused by an anisotropic momentum distributions of
the particles in the plasma, are likely to play an important role in
thermalization in heavy ion collisions. We consider plasmas with two different
components of particles, one strongly anisotropic and one isotropic or nearly
isotropic. The isotropic component does not eliminate instabilities but it
decreases their growth rates. We investigate the impact of plasma instabilities
on the first stage of the ``bottom-up'' thermalization scenario in which such a
two-component plasma emerges, and find that even in the case of non-abelian
saturation instabilities qualitatively change the bottom-up picture.


title: Energy from the nonperturbative QCD vacuum

abstract:
  Using the effective potential approach for composite operators, we have
formulated a general method of calculation of the truly nonperturbative
Yang-Mills vacuum energy density (the Bag constant apart from the sign, by
definition). It is the main dynamical characteristic of the QCD ground state.
We define it as an integration of the truly nonperturbative effective charge
over the nonperturbative region (soft momentum region). It is free of all types
of the perturbative contributions, by construction. For the considered truly
nonperturbative effective charge it is finite, negative and it has no imaginary
part (stable vacuum), as well as it is a manifestly gauge-invariant, i.e., not
explicitly depending on the gauge-fixing parameter. A nontrivial minimization
procedure makes it possible to determine the Bag constant as a function either
of the mass gap, which is responsible for the large-scale structure of the true
QCD vacuum, or of the effective scale, which separates the nonperturbative
region from the perturbative one. We have also argued that the Bag constant is
a quant of energy density which can be released from the QCD vacuum, which, in
its turn, is considering as an infinite and permanent reservoir of energy.


title: Singularity of Feynman propagator and Cutkosky's cutting rules

abstract:
  We improve on Cutkosky's cutting rules which is used to calculate the
contribution of the singularities of Feynman propagators to Feynman amplitude.
The correctness of the improved cutting rules is verified by the calculations
of the conventional loop momentum integral algorithm. We also find that only
the process of the intermediate on shell particles that is same as real
physical process can exist in quantum vacuum.


title: Charged Higgs Production in Association with W Boson at Photon Colliders

abstract:
  It is important to explore the Higgs sector in order to identify the model
beyond the standard model. We study the charged Higgs production in the
$\gamma\gamma$ mode of a linear collider (LC) with 1000 GeV center of mass
energy. We show that the cross sections for the $\gamma \gamma \to H^\pm W^\mp$
processes can be significantly enhanced in the two Higgs doublet model (THDM).
The cross section can reach 0.1 - 100 fb which is comparable to other charged
Higgs boson production processes at a photon collider. While for other
processes the cross sections are too small for $m_H^\pm \geq 500$ GeV, $0.1 -
100$ fb can be expected in the $\gamma\gamma \to H^\pm W^\mp$ processes for
$m_H^\pm \geq 570$ GeV when $m_{A^0}=800$ GeV. Therefore, even if the charged
Higgs bosons can not be detected at the Large Hadron Collider (LHC), and even
if the charged Higgs bosons are too heavy to be detected in other charged Higgs
boson production processes at the LC, it may be possible to detect them in this
process.


title: Gauge dependence of on-shell and pole mass renormalization prescriptions

abstract:
  We discuss the gauge dependence of physical parameter's definitions under the
on-shell and pole mass renormalization prescriptions. By two-loop-level
calculations we prove for the first time that the on-shell mass renormalization
prescription makes physical result gauge dependent. On the other hand, such
gauge dependence doesn't appear in the result of the pole mass renormalization
prescription. Our calculation also implies the difference of the physical
results between the two mass renormalization prescriptions cannot be neglected
at two-loop level.


title:
Single production of the gauge boson $W$ via polarized $e^{-}\gamma$
  collisions in the littlest Higgs model

abstract:
  In the framework of the littlest Higgs($LH$) model, we study single
production of the standard model($SM$) gauge boson $W_{s}^{-}$ and the heavy
gauge boson $W_{H}^{-}$ via polarized $e^{-}\gamma$ collisions. We find that
the corrections of the $LH$ model to the cross section $\sigma(W_{s}^{-})$
might be observed only for the scale parameter $f\leq 1.5TeV$ and the mixing
parameter $c'\geq 0.4$ in future high energy linear $e^{+}e^{-}$ collider($LC$)
experiment with the center-of-mass($CM$) energy $\sqrt{S}=500GeV$ and a yearly
integrated luminosity $\pounds=100fb^{-1}$. However, with a suitably chosen
polarization of the initial electron and position beams, the possible signals
of the heavy gauge boson $W_{H}^{-}$ can be easily detected via $e^{-}\gamma$
collisions in future $LC$ experiment with $\sqrt{S}=3TeV$ and
$\pounds=500fb^{-1}$.


title: Chemical thermalization in relativistic heavy ion collisions

abstract:
  We compute by numerical integration of the Dirac equation the number of
quark-antiquark pairs initially produced in the classical color fields of
colliding ultrarelativistic nuclei. While the number of qqbar pairs is
parametrically suppressed in the coupling constant, we find that in this
classical field model their production rate is comparable to the thermal ratio
of gluons/pairs = 9 N_f/32. After isotropization one thus would have
quark-gluon plasma in chemical equilibrium.


title:
W-exchange/Annihilation amplitudes in LCSR - $B_d^0 \to D_s^-K^+$ as an
  example

abstract:
  We evaluate the W-exchange diagram within the framework of light cone sum
rules (LCSR), taking $B_d^0 \to D_s^-K^+$ as an example. This decay mode,
though proceeding via the W-exchange diagram only and therefore expected to be
highly suppressed, has the branching ratio $3.2 \times 10^{-5}$. We estimate
the W-exchange amplitude within LCSR, including soft gluon corrections, to
twist-3 accuracy. The calculation naturally brings out the features which
suggest that such an amplitude is expected to be small in cases when both the
final state mesons are light, without relying on any kind of an assumption.
With minor changes, it is also possible to have a rough estimate of the
exchange/annihilation type contributions to other processes like $B \to \pi
\pi,~\pi K, KK$. We find that though it appears as if the sum rule method
yields a fair agreement with the observed value, a careful analysis of
individual terms shows that the method, in its present form, is inadequate to
capture the correct physical answer for the case of heavy final states.


title: Neutrino Mass Matrix from S_4 Symmetry

abstract:
  The cubic symmetry S_4 contains A_4 and S_3, both of which have been used to
study neutrino mass matrices. Using S_4 as the family symmetry of a complete
supersymmetric theory of leptons, it is shown how the requirement of breaking
S_4 at the seesaw scale without breaking supersymmetry enforces a special form
of the neutrino mass matrix which exhibits maximal nu_mu - nu_tau mixing as
well as zero U_e3. In addition, (nu_e + nu_mu + nu_tau)/sqrt{3} is naturally
close to being a mass eignestate, thus predicting tan^2 theta_12 to be near but
not equal to 1/2.


title: High Energy Evolution - The Wave Function Point of View

abstract:
  These lectures discuss aspects of high energy evolution in QCD. This includes
the derivation of the JIMWLK equation, basic physics of its solutions and
recent work on inclusion of Pomeron loops. The entire discussion is given in
the Hamiltonian framework which gives direct access to the evolution of
hadronic wave function under Lorentz boost.


title: Through the Looking-Glass: Alice's Adventures in Mirror World

abstract:
  We briefly review the concept of a parallel `mirror' world which has the same
particle physics as the observable world and couples to the latter by gravity
and perhaps other very weak forces. The nucleosynthesis bounds demand that the
mirror world should have a smaller temperature than the ordinary one. By this
reason its evolution should substantially deviate from the standard cosmology
as far as the crucial epochs like baryogenesis, nucleosynthesis etc. are
concerned. In particular, we show that in the context of certain baryogenesis
scenarios, the baryon asymmetry in the mirror world should be larger than in
the observable one. Moreover, we show that mirror baryons could naturally
constitute the dominant dark matter component of the Universe, and discuss its
cosmological implications.


title: Near threshold expansion of Feynman diagrams

abstract:
  The near threshold expansion of Feynman diagrams is derived from their
configuration space representation, by performing all x integrations. The
general scalar Feynman diagram is considered, with an arbitrary number of
external momenta, an arbitrary number of internal lines and an arbitrary number
of loops, in n dimensions and all masses may be different. The expansions are
considered both below and above threshold. Rules, giving real and imaginary
part, are derived. Unitarity of a sunset diagram with I internal lines is
checked in a direct way by showing that its imaginary part is equal to the
phase space integral of I particles.


title: Loop corrections to the form factors in $ B \to \pi l \nu$ decay

abstract:
  In this paper we study the semileptonic decay $B\to\pi l \nu$ and in
particular the factorizable contribution to symmetry breaking corrections to
the form factors at large recoil. This contribution is a convolution of the
coefficient function, which can be calculated in perturbation theory, and of
the nonperturbative light-cone distribution amplitudes of the mesons. The
coefficient function, in turn, can also be represented as convolution of the
hard Wilson coefficient and of the jet function. Loop corrections to the hard
Wilson coefficient and jet function are calculated. We use the method of
expanding by regions to calculate these corrections. The results obtained
coincide with the ones calculated in the framework of the soft-collinear
effective theory (SCET). Factorization of soft and collinear singularities into
the light-cone distribution amplitudes is demonstrated at one-loop level
explicitly. It is also demonstrated that the contribution of the so-called
soft-messenger modes vanishes; this fact is of critical importance to the
factorization approach to this decay.


title:
Can Measurements of Electric Dipole Moments Determine the Seesaw
  Parameters?

abstract:
  In the context of the supersymmetrized seesaw mechanism embedded in the
Minimal Supersymmetric Standard Model (MSSM), complex neutrino Yukawa couplings
can induce Electric Dipole Moments (EDMs) for the charged leptons, providing an
additional route to seesaw parameters. However, the complex neutrino Yukawa
matrix is not the only possible source of CP violation. Even in the framework
of Constrained MSSM (CMSSM), there are additional sources, usually attributed
to the phases of the trilinear soft supersymmetry breaking couplings and the
mu-term, which contribute not only to the electron EDM but also to the EDMs of
neutron and heavy nuclei. In this work, by combining bounds on various EDMs, we
analyze how the sources of CP violation can be discriminated by the present and
planned EDM experiments.


title:
Enhanced KL to pi0 nu nubar from Direct CP Violation in B to K pi with
  Four Generations

abstract:
  Recent CP violation results in B decays suggest that Z penguins may have
large weak phase. This can be realized by the four generation (standard) model.
Concurrently, B to Xs l+ l- and Bs mixing allow for sizable Vt's* Vt'b only if
it is nearly imaginary. Such large effects in b to s transitions would affect s
to d transitions, as kaon constraints would demand Vt'd different from zero.
Using Gamma(Z to b bbar) to bound |Vt'b|, we infer sizable |Vt's| < |Vt'b| <
|Vus|$. Imposing epsilon_K, K+ to pi+ nu nubar and epsilon'/epsilon
constraints, we find Vt'd* Vt's = few x 10^(-4) with large phase, enhancing KL
to pi0 nu nubar to 5x10^(-10) or even higher. Interestingly, Delta_mBd and
sin(2PhiBd) are not much affected, as |Vt'd* Vt'b| << |Vtd* Vtb| = 0.01.


title: Calculating four-loop tadpoles with one non-zero mass

abstract:
  An efficient method to calculate tadpole diagrams is proposed. Its capability
is demonstrated by analytically evaluating two four-loop tadpole diagrams of
current interest in the literature, including their $O(\epsilon)$ terms in
$D=4-2\epsilon$ space-time dimensions.


title:
Present and Future Experiments in Non-equilibrium Reactor Antineutrino
  Energy Spectrum

abstract:
  Considerable efforts that have been undertaken in the recent years in low
energy antineutrino experiments require further systematic investigations in
line of reactor antineutrino spectroscopy as a metrological basis of these
experiments. We consider some effects associated with the non-equilibrium of
reactor antineutrino radiation and residual antineutrino emission from spent
reactor fuel in contemporary antineutrino experiments.


title: Nucleon QCD sum rules with the radiative corrections

abstract:
  QCD sum rules for the nucleon are considered in complex q^2 plane with
inclusion of the radiative corrections of the order alpha_s. It is shown that
the radiative corrections affect mainly the residue lambda^2 of the nucleon
pole. Their influence on the value of the nucleon mass is much smaller.
Following the ideas of Ioffe and Zyablyuk we expand the analysis to complex
values of q^2. This provides a more stable solution. Varying the weights of the
contributions of different dimensions by changing the value of the angle in the
complex plane we find the value of the six-quark condensate which insures the
best consistency of the right hand sides and left hand sides of the sum rules.
The corresponding value of the six-quark condensate appears to be only about
10% smaller then the one, provided by the factorization approximation. The
value of the four-quark condensate also appears to be close to the one,
corresponding to the factorization assumption. The role of the gluon condensate
and its possible values are discussed.


title: MW and sin^2\theta_eff in Split SUSY: present and future expectations

abstract:
  We analyse the precision electroweak observables MW and sin^2\theta_eff and
their correlations in the recently proposed Split SUSY model. We compare the
results with the Standard Model and Minimal Supersymmetric Standard Model
predictions, and with present and future experimental accuracies. Present
experimental accuracies in (MW, sin^2\theta_eff) do not allow constraints to be
placed on the Split SUSY parameter space. We find that the shifts in (MW,
sin^2\theta_eff) induced by Split SUSY can be larger than the anticipated
accuracy of the GigaZ option of the International Linear Collider, and that the
most sensitive observable is sin^2\theta_eff. These large shifts are possible
also for large chargino masses in scenarios with small tan(\beta) =~ 1.


title: Lectures on QED and QCD

abstract:
  The lectures are a practical introduction to perturbative calculations in QED
and QCD. I discuss methods of calculation of one- and two-loop diagrams in
dimensional regularization, MSbar and on-shell renormalization schemes,
decoupling of heavy-particle loops.


title:
Majorana CP-Violating Phases, RG Running of Neutrino Mixing Parameters
  and Charged Lepton Flavour Violating Decays

abstract:
  We consider the MSSM with see-saw mechanism of neutrino mass generation and
soft SUSY breaking with flavour-universal boundary conditions at the GUT scale,
in which the lepton flavour violating (LFV) decays \mu\to e + \gamma, \tau\to
\mu + \gamma, etc.,are predicted with rates that can be within the reach of
present and planned experiments. These predictions depend critically on the
matrix of neutrino Yukawa couplings \bf{Y_{\nu}} which can be expressed in
terms of the light and heavy right-handed (RH) neutrino masses, neutrino mixing
matrix U_{PMNS}, and an orthogonal matrix \bf{R}. We investigate the effects of
Majorana CP-violation phases in U_{PMNS}, and of the RG running of light
neutrino masses and mixing angles from M_Z to the RH Majorana neutrino mass
scale M_R, on the predictions for the rates of LFV decays \mu\to e + \gamma,
\tau \to \mu + \gamma and \tau\to e + \gamma. Results for neutrino mass
spectrum with normal hierarchy, values of the lightest \nu-mass in the range 0
\leq m_1 \leq 0.30 eV, and quasi-degenerate heavy RH Majorana neutrinos in the
cases of \bf{R} = \bf{1} and complex matrix \bf{R} are presented. We find that
the effects of the Majorana CP-violation phases and of the RG evolution of
neutrino mixing parameters can change by few orders of magnitude the predicted
rates of the LFV decays \mu \to e + \gamma and \tau \to e + \gamma. The impact
of these effects on the \tau \to \mu + \gamma decay rate is typically smaller
and only possible for m_1 > 0.10 eV. If the RG running effects are negligible,
in a large region of soft SUSY breaking parameter space the ratio of the
branching ratios of the \mu \to e + \gamma and \tau \to e + \gamma (\tau \to
\mu + \gamma) decays is entirely determined in the case of \bf{R} \cong \bf{1}
by the values of the neutrino mixing parameters at M_Z.


title: Particle Ratios in Heavy-Ion Collisions

abstract:
  In framework of statistical models, different particle ratios at energies
ranging from $3.5 $ to $200 $GeV are calculated. Assuming that the particle
production takes place along the freeze-out curve, we study the sharp peak in
$K^+/\pi^+$ ratio observed at SPS energy. We study the responsibility of
non-equilibrium quark occupancy of phase space $\gamma_i$ for particle
production. Allowing $\gamma_i$ to take values other than that of equilibrium,
we got a very well description for $K^+/\pi^+$ ratio at all energies. Using the
resulting parameter set, we analyzed the $K^-/\pi^-$, $\Lambda/\pi^+$ and
\hbox{$\Lambda/<\pi>$} ratios. We found that the corresponding peaks all are
located at the same value of energy, $\sqrt{s_{NN}}^{(c)}\simeq7.5 $GeV. At
this energy, the entropy per particle is singular. The saddle-point in entropy
per particle likely refers to critical phenomenon and change in the phase
space.


title:
Bremsstrahlung neutrinos from electron-electron scattering in a
  relativistic degenerate electron plasma

abstract:
  We present a calculation of neutrino pair bremsstrahlung due to
electron-electron scattering in a relativistic degenerate plasma of electrons.
Proper treatment of the in-medium photon propagator, i.e., inclusion of Debye
screening of the longitudinal part and Landau damping of the transverse part,
leads to a neutrino emissivity which is several orders of magnitude larger than
when Debye screening is imposed for the tranverse part. Our results show that
this in-medium process can compete with other sources of neutrino radiation and
can, in some cases, even be the dominant neutrino emission mechanism. We also
discuss the natural extension to quark-quark bremsstrahlung in gapped and
ungapped quark matter.


title: Optical theorem and cutting rules

abstract: This manuscript has been withdrawn at 17 April, 2007.


title: Reconstructing sleptons in cascade-decays at the linear collider

abstract:
  A method to reconstruct sleptons in cascade-decays at the FLC is presented.
It is shown that experimental mass-resolutions as low as 8.7 MeV/c^2 are
attainable.


title: Parton distribution functions from the precise NNLO QCD fit

abstract:
  We report the parton distribution functions (PDFs) determined from the NNLO
QCD analysis of the world inclusive DIS data with account of the precise NNLO
QCD corrections to the evolution equations kernel. The value of strong coupling
constant \alpha_s^{NNLO}(M_Z)=0.1141(14), in fair agreement with one obtained
using the earlier approximate NNLO kernel by van Neerven-Vogt. The intermediate
bosons rates calculated in the NNLO using obtained PDFs are in agreement to the
latest Run II results.


title: Central Exclusive Di-jet Production at the Tevatron

abstract:
  We perform a phenomenological analysis of dijet production in double pomeron
exchange at the Tevatron. We find that the CDF Run I results do not rule out
the presence of an exclusive dijet component, as predicted by Khoze, Martin and
Ryskin (KMR). With the high statistics CDF Run II data, we predict that an
exclusive component at the level predicted by KMR may be visible, although the
observation will depend on accurate modelling of the inclusive double pomeron
exchange process. We also compare to the predictions of the DPEMC Monte Carlo,
which contains a non-perturbative model for the central exclusive process. We
show that the perturbative model of KMR gives different predictions for the
di-jet ET dependence in the high di-jet mass fraction region than
non-perturbative models.


title:
Heavy-to-light B meson form factors at large recoil energy --
  spectator-scattering corrections

abstract:
  We complete the investigation of loop corrections to hard
spectator-scattering in exclusive B meson to light meson transitions by
computing the short-distance coefficient (jet-function) from the hard-collinear
scale. Adding together the two coefficients from matching QCD to SCET_I to
SCET_II, we investigate the size of loop effects on the ratios of
heavy-to-light meson form factors at large recoil. We find the corrections from
the hard and hard-collinear scales to be of approximately the same size, and
significant, but the perturbative expansions appear to be well-behaved. Our
calculation provides a non-trivial verification of the factorization arguments.
We observe considerable differences between the predictions based on
factorization in the heavy-quark limit and current QCD sum rule calculations of
the form factors. We also include the hard-collinear correction in the B -> pi
pi tree amplitudes, and find an enhancement of the colour-suppressed amplitude
relative to the colour-allowed amplitude.


title: D_s (2317) as a four-quark state in QCD sum rules

abstract:
  We perform a QCD sum rule study of the open-charmed $D_s (2317)$ as a
four-quark state. Using the diquark-antidiquark picture for the four-quark
state, we consider four possible interpolating fields for $D_s (2317)$, namely,
scalar-scalar, pseudoscalar-pseudoscalar, vector-vector, and
axial-vector--axial-vector types. We test all four currents by constructing
four separate sum rules. The sum rule with the scalar-scalar current gives a
stable value for the $D_s$ mass which qualitatively agrees with the
experimental value, and the result is not sensitive to the continuum threshold.
The vector-vector sum rule also gives a stable result with small sensitivity to
the continuum threshold and the extracted mass is somewhat lower than the
scalar-scalar current value. On the other hand, the two sum rules in the
pseudoscalar and axial-vector channels are found to yield the mass highly
sensitive to the continuum threshold, which implies that a four-quark state
with the combination of pseudoscalar-pseudoscalar or axial-vector--axial-vector
type would be disfavored. These results would indicate that $D_s (2317)$ is a
bound state of scalar-diquark and scalar-antidiquark and/or vector-diquark and
vector-antidiquark.


title:
Effects of the CP Odd Dipole Operators on Gluino Production at Hadron
  Colliders

abstract:
  We present the cross sections for the hadroproduction of gluinos by taking
into account the CP odd dipole operators in supersymmetric QCD. The dependence
of the cross sections on these operators is analyzed for the hadron colliders
the Tevatron ($\sqrt S$=1.8 TeV) and the Cern LHC ($\sqrt{S}$=14 TeV). The
enhancement of the hadronic cross section is obviously mass dependent and for a
500 GeV gluino, is up to 16 % (over 73 pb) at the LHC while it is 8 % (over
0.63 fb) at the Tevatron.


title:
Electroweak corrections to hadronic photon production at large
  transverse momenta

abstract:
  We study the impact of electroweak radiative corrections on direct production
of photons with high transverse momenta at hadron colliders. Analytic results
for the weak one-loop corrections to the parton scattering reaction $\bar q q
\to \gamma g$ and its crossed variants are presented. For the high-energy
region, where the corrections are strongly enhanced by logarithms of $\hat
s/M_W^2$, we derive simple asymptotic expressions which approximate the exact
one-loop results with high precision. The dominant two-loop electroweak
contributions are also calculated. Numerical results are presented for the LHC
and the Tevatron. The corrections are negative and their size increases with
transverse momentum. For the LHC, where transverse momenta of 2 TeV or more can
be reached, the size of the one- and two-loop effects amounts up to -17% and
+3%, respectively. At the Tevatron, with transverse momenta up to 400 GeV, the
one-loop corrections do not exceed -4% and the two-loop effects are negligible.
Finally we compare the cross sections for hadronic production of photons and Z
bosons and find that the electroweak corrections have an important impact on
their ratio.


title:
Decays of Scalar and Pseudoscalar Higgs Bosons into Fermions: Two-loop
  QCD Corrections to the Higgs-Quark-Antiquark Amplitude

abstract:
  As a first step in the aim of arriving at a differential description of
neutral Higgs boson decays into heavy quarks, $h \to Q {\bar Q}X$, to second
order in the QCD coupling $\alpha_S$, we have computed the $hQ{\bar Q}$
amplitude at the two-loop level in QCD for a general neutral Higgs boson which
has both scalar and pseudoscalar couplings to quarks. This amplitude is given
in terms of a scalar and a pseudoscalar vertex form factor, for which we
present closed analytic expressions in terms of one-dimensional harmonic
polylogarithms of maximum weight 4. The results hold for arbitrary
four-momentum squared, $q^2$, of the Higgs boson and of the heavy quark mass,
$m$. Moreover we derive the approximate expressions of these form factors near
threshold and in the asymptotic regime $m^2/q^2 \ll 1$.


title: Probing the Color Glass Condensate in an electron-ion collider

abstract:
  Perturbative Quantum Chromodynamics (pQCD) predicts that the small-$x$ gluons
in a hadron wavefunction should form a Color Glass Condensate (CGC),
characterized by a saturation scale $Q_s (x, A)$ which is energy and atomic
number dependent. In this paper we study the predictions of CGC physics for
electron - ion collisions at high energies. We consider that the nucleus at
high energies acts as an amplifier of the physics of high parton densities and
estimate the nuclear structure function $F_2^A(x,Q^2)$, as well as the
longitudinal and charm contributions, using a generalization for nuclear
targets of the Iancu-Itakura-Munier model which describes the $ep$ HERA data
quite well. Moreover, we investigate the behavior of the logarithmic slopes of
the total and longitudinal structure functions in the kinematical region of the
future electron - ion collider eRHIC.


title: Testing SUSY models of lepton flavor violation at a photon collider

abstract:
  The loop level lepton flavor violating signals $\gamma \gamma \to \ell \ell'
  (\ell=e,\mu,\tau, \ell \neq \ell^\prime)$ are studied in a scenario of
low-energy, R-parity conserving, supersymmetric seesaw mechanism within the
context of a high energy photon collider. Lepton flavor violation is due to off
diagonal elements in the left s-lepton mass matrix induced by renormalization
group equations. The average slepton masses ${\widetilde{m}}$ and the off
diagonal matrix elements $\Delta m$ are treated as model independent free
phenomenological parameters in order to discover regions in the parameter space
where the signal cross section may be observable. At the energies of the
$\gamma \gamma$ option of the future high-energy linear collider the signal has
a potentially large standard model background, and therefore particular
attention is paid to the study of kinematical cuts in order to reduce the
latter at an acceptable level. We find, for the ($e\tau$) channel,
non-negligible fractions of the parameter space ($\delta_{LL}=\Delta
m^2/\widetilde{m}^2 \gtrsim 10^{-1}$) where the statistical significance ($SS$)
is $SS \gtrsim 3$.


title:
Magnetic Monopoles and Duality Symmetry Breaking in Maxwell's
  Electrodynamics

abstract:
  It is shown how to break the symmetry of a Lagrangian with duality symmetry
between electric and magnetic monopoles, so that at low energy, electric
monopole interactions continue to be observed but magnetic monopole
interactions become very highly suppressed to the point of effectively
vanishing. The "zero-charge" problem of source-free electrodynamics is solved
by requiring invariance under continuous, local, duality transformations, while
local duality symmetry combined with local U(1)EM gauge symmetry leads
naturally and surprisingly to an SU(2)D duality gauge group.


title: The X(3872) boson: Molecule or charmonium

abstract:
  It has been argued that the mystery boson X(3872) is a molecule state
consisting of primarily D0-D0*bar + D0bar-D*0. In contrast, apparent puzzles
and potential difficulties have been pointed out for the charmonium assignment
of X(3872). We examine several aspects of these alternatives by
semiquantitative methods since quantitatively accurate results are often hard
to reach on them. We find that some of the observed properties of X(3872), in
particualr, the binding and the production rates are incompatible with the
molecule interpretation. Despite puzzles and obstacles, X(3872) may fit more
likely to the excited triplet P_1 charmonium than to the molecule after mixing
of cc-bar with DD*-bar +Dbar-D* is taken into account. One simple experimental
test is pointed out for distinguishing between a charmonium and an
isospin-mixed molecule in the neutral B decay.


title: The SVZ-Expansion and Beyond

abstract:
  I discuss the standard SVZ-expansion of the QCD two-point correlators in
terms of the QCD vacuum condensates and beyond it due to a new unflavoured
1/Q^2-term (tachyonic gluon mass squared \lambda^2) which modelizes the effects
of uncalculated higher order perturbative terms. The approach is confronted
with low-energy and lattice data. One can notice that, in the different
examples studied here, high-dimension condensates are expected to deviate
largely from their vacuum saturation (large N_c) values, while the new
1/Q^2-term due to \lambda^2 solves the hadronic mass scale hierarchy-puzzle
encountered in the early SVZ-sum rule analysis and improves the low-energy
phenomenology. From tau-decay data, one can extract the running strange quark
mass m_s(2 GeV)=(93^{+29}_{-32}) MeV and a more accurate value of the QCD
coupling \alpha_s(M_Z)=0.117+- 0.002.


title:
The Riddle of the f0(980) and a0(980): Are They the Quark-Antiquark
  States?

abstract:
  A list of arguments favouring quark-antiquark nature of a0(980) and f0(980)
is presented.


title: A Comprehensive Approach to Structure Functions

abstract:
  A model is presented based on a dipole picture with a hard and a soft
pomeron. It is assumed that large dipoles couple to the soft pomeron and small
dipoels couple to the hard pomeron. Most of the parameters of the model are
predetermined from proton-proton scattering and the only free parameter is the
radius Rc, defining the transition from small to large dipoles. This is fixed
by the proton structure function. The model then successfully predicts the
proton charm and longitudinal structure functions, J/psi photoproduction, the
DVCS cross section, the total gamma-p and gamma-gamma cross sections and the
photon structure function.


title: Quark Spin-flip in Pomeron Exchange

abstract:
  It has been shown that the energy dependence of the reaction gamma p -->
b1(1235) requires a contribution from pomeron exchange. This necessitates
spin-flip at the quark level as the transition is from a 3S1 state to a 1P1
state. The same mechanism occurs in the reaction pi p --> a1(1260) p, which is
a 1S0 to 3P1 transition.


title: Forty-fifth anniversary of the Nambu-Jona-Lasinio model

abstract:
  A short review of the development of the Nambu-Jona-Lasinio (NJL) model is
given. The SU(2)x SU(2) and U(3)x U(3) local quark NJL models are considered.
The mechanisms of spontaneous breaking of chiral symmetry and vector dominance
are shown. The local NJL model allows us to describe the mass spectrum and main
strong and electroweak decays of the four ground-state nonets of pseudoscalar,
scalar, vector and axial-vector mesons. Applications of this model to the
description of mesons in hot and dense medium are discussed. It is shown that
for solving problems connected with the description of the meson radial
excitations and quark confinement it is necessary to consider a nonlocal
extension of the NJL model. The main attention is attracted to the description
of the methods used in different versions of the NJL model. Physical results
for low-energy hadron physics obtained in these models can be found in the
cited works.


title: Scalar sigma meson at finite temperature in nonlocal quark model

abstract:
  Properties and temperature behavior of pi and sigma bound states are studied
in the framework of the nonlocal model with a separable interaction kernel
based on the quark Dyson-Schwinger and the meson Bethe-Salpeter equations.
M_pi(T), f_pi(T), M_sigma(T) and Gamma_{sigma -> pi pi}(T) are considered above
and below the deconfinement and chiral restoration transitions.


title: Higher-Order Soft Corrections to Lepton Pair and Higgs Boson Production

abstract:
  Utilizing recent three-loop results on the quark and gluon splitting
functions and form factors, we derive the complete threshold-enhanced
third-order (N^3LO) QCD corrections to the total cross sections for the
production of lepton pairs and the Higgs boson in hadron collisions. These
results, for the latter case obtained in the heavy top-quark limit, are
employed to extend the threshold resummation for these processes to the fourth
logarithmic order. We investigate the numerical impact of the higher-order
corrections for Higgs boson production at the Tevatron and the LHC. Our
results, suitably treated in Mellin N-space, provide a sufficiently accurate
approximation to the full N^3LO contributions. Corrections of about 5% at the
LHC and 10% at the Tevatron are found for typical Higgs masses. The N^3LO
predictions exhibit a considerably reduced dependence on the renormalization
scale with, for the first time, stationary points close to the Higgs mass.


title: Higgs bosons in Left-Right symmetric Randall-Sundrum models

abstract:
  We study the corrections to Higgs physics in a model of a single warped extra
dimension with all fields except the Higgs in the bulk, and a gauge symmetry
extended to $SU(2)_L\times SU(2)_R \times U(1)_{B-L}$. We find that generically
the Higgs coupling to electroweak gauge boson pairs is suppressed, the coupling
to gluons is enhanced, and the coupling to photons is often suppressed, but can
be enhanced.


title:
Higgs boson interference in mu^+ mu^- ->chargino_i chargino_j with
  longitudinally polarized beams

abstract:
  We study chargino production at a muon collider with longitudinally polarized
beams and center of mass energies around the heavy neutral Higgs boson
resonances. We show that the interference of the CP even and CP odd Higgs
bosons can be analyzed using the energy distributions of the lepton or W boson
from the chargino two-body decays \tilde\chi^\pm_j\to\ell^\mp\tilde\nu_\ell or
\tilde\chi^\pm_j \to W^\pm \neutralino_1, respectively. The energy
distributions depend on the longitudinal polarization of the decaying chargino,
which are correlated to the muon beam polarizations. We define asymmetries in
these energy distributions which allow a determination of the H and A couplings
to the charginos and in particular of their relative phase. We analyze the
asymmetries, cross sections and branching ratios in CP conserving Minimal
Supersymmetric Standard Model scenarios. For nearly degenerate Higgs bosons we
find maximal asymmetries which can be measured with high statistical
significance.


title:
Collective Flow Distributions and Nuclear Stopping in Heavy-ion
  Collisions at AGS, SPS and RHIC

abstract:
  We study the production of proton, antiproton and net-proton at \AGS, \SPS
and \RHIC within the framework non-uniform flow model(NUFM) in this paper. It
is found that the system of RHIC has stronger longitudinally non-uniform
feature than AGS and SPS, which means that nuclei at RHIC energy region is much
more transparent. The NUFM model provides a very good description of all proton
rapidity at whole AGS, SPS and RHIC. It is shown that our analysis relates
closely to the study of nuclear stopping and longitudinally non-uniform flow
distribution of experiment. This comparison with AGS and SPS help us to
understand the feature of particle stopping of thermal freeze-out at RHIC
experiment.


title: Generation Mixing of Sneutrinos in Heavier Chargino Decay

abstract:
  The heavier chargino decay could yield two charged leptons of different
generations, owing to generation mixing of sneutrinos. We discuss the
possibility of producing $e$ and $\mu$ through this process in near future
collider experiments. The analyses are made systematically in the
supersymmetric extension of the standard model without assuming a specific
scenario for the mixing. Production of the heavier chargino is evaluated in
$e^+e^-$ collisions. In the parameter region consistent with nonobservation of
the radiative $\mu$ decay, sizable parts lead to a detectable branching ratio
for the generation-changing decay of the heavier chargino.


title: Do current WIMP direct measurements constrain light relic neutralinos?

abstract:
  New upper bounds on direct detection rates have recently been presented by a
number of experimental collaborations working on searches for WIMPs. In this
paper we analyze how the constraints on relic neutralinos which can be derived
from these results is affected by the uncertainties in the distribution
function of WIMPs in the halo. Various different categories of velocity
distribution functions are considered, and the ensuing implications for
supersymmetric configurations derived. We conservatively conclude that current
experimental data do not constrain neutralinos of small mass (below 50 GeV).


title:
About possibility to search the electron EDM at the level $10^{-28} \div
  10^{-30}$ e$\cdot$cm and the constant of T-odd, P-odd scalar weak interaction
  of an electron with a nucleus at the level $10^{-5} \div 10^{-7}$ in the
  heavy atoms and ferroelectrics

abstract:
  The T-odd phenomenon of induction of the magnetic field by a static electric
field provides to study the electron EDM and constants of T-odd, P-odd
interaction of an electron with a nucleus. Measurement of this magnetic field
for ferroelectric materials (like PbTiO_3) at the level B~3 10^{-18} G allows
to derive the electric dipole moment of an electron at the level d_e ~ 10^{-30}
e cm and the constant of T-odd scalar weak interaction of an electron with a
nucleus at the level k_1^{nuc}10^{-9}. The atomic magnetometry makes possible
to measure fields ~ 10^{-13} G/\sqrt{Hz} now. This means that for 10 days
operation one can expect to obtain B at the level B ~ 10^{-16}G, and,
therefore, the limits for d_e in PbTiO_3 at the level d_e ~ 10^{-28} and
k_1^{nuc}~10^{-7}. that makes the discussed method beneficial for measuring d_e
and k_1^{nuc}.


title: Heavy cosmic strings

abstract:
  We argue that cosmic strings with high winding numbers generally form in
first-order gauge symmetry breaking phase transitions, and we demonstrate this
using computer simulations. These strings are heavier than single-winding
strings and therefore more easily observable. Their cosmological evolution may
also be very different.


title:
A universal description for the freezeout parameters in heavy-ion
  collisions

abstract:
  It is shown that the freezeout parameters estimated in the heavy-ion
collisions all are well described by a constant value of the entropy density
$s$ divided by $T^3$. The value of $s/T^3$ has been taken from the lattice QCD
simulations at zero baryo-chemical potential $\mu_B$ and assumed to remain
constant for finite $\mu_B$. This implies that the hadronic matter in rest
frame of produced system can be determined by constant degrees of freedom.
Furthermore, this condition has been used to predict the freezeout parameters
at low temperatures.


title: Diffractive Higgs production: theory

abstract:
  We review the calculation for Higgs production via the exclusive reaction pp
-> p+H+p. In the first part we review in some detail the calculation of the
Durham group and emphasise the main areas of uncertainty. Afterwards, we
comment upon other calculations.


title: Testing universality of the Color Glass Condensate descriptions

abstract:
  Perturbative Quantum Chromodynamics (pQCD) predicts that the small-$x$ gluons
in a hadron wavefunction should form a Color Glass Condensate (CGC), which has
universal properties, which are the same for all hadrons or nuclei. Assuming
this property, in this paper we cross relate the current CGC descriptions of
the $ep$ HERA data and $dAu$ RHIC data. In particular, we use the quark dipole
scattering amplitude recently proposed by Kharzeev, Kovchegov and Tuchin (KKT)
to explain the high $p_T$ particle suppression observed in $dAu$ collisions at
RHIC in our calculations of the proton and longitudinal structure functions. We
present a detailed comparison between this parameterization and those proposed
to describe the $ep$ HERA data. We find out that, due to its peculiar
dependence on the energy and dipole separation, the KKT parameterization is
able to describe the experimental $ep$ data only in a limited kinematical range
of photon virtualities.


title: Inclusive Gluon Production In High Energy Onium-Onium Scattering

abstract:
  We calculate the inclusive single-gluon production cross section in high
energy onium-onium scattering including pomeron loop effects. The resulting
inclusive cross section is given by the k_T-factorization formula with one of
the unintegrated gluon distribution functions depending on the total
onium-onium scattering cross section, which includes all pomeron loops and has
to be found independently. We discuss the limits of applicability of our result
and argue that they are given by the limits of applicability of pomeron loop
resummation approach. Since the obtained k_T-factorization formula is infrared
divergent we conclude that, in order to consistently calculate the
(infrared-finite) gluon production cross section in onium-onium scattering, one
has to include corrections going beyond the pomeron loop approximation.


title: Large Rapidity Gap Processes in Proton-Nucleus Collisions

abstract:
  The cross sections for a variety of channels of proton-nucleus interaction
associated with large gaps in rapidity are calculated within the Glauber-Gribov
theory. We found inelastic shadowing corrections to be dramatically enhanced
for such events. We employ the light-cone dipole formalism which allows to
calculate the inelastic corrections to all orders of the multiple interaction.
Although Gribov corrections are known to make nuclear matter more transparent,
we demonstrate that in some instances they lead to an opaqueness. Numerical
calculations are performed for the energies of the HERA-B experiment, and the
RHIC-LHC colliders.


title: Obtaining the Neutrino Mixing Matrix with the Tetrahedral Group

abstract:
  We discuss various "minimalist'' schemes to derive the neutrino mixing matrix
using the tetrahedral group $A_{4}.$


title: Off-the-Wall Higgs in the Universal Randall-Sundrum Model

abstract:
  We outline a consistent Randall-Sundrum (RS) framework in which a fundamental
5-dimensional Higgs doublet induces electroweak symmetry breaking (EWSB). In
this framework of a warped Universal Extra Dimension, the lightest Kaluza-Klein
(KK) mode of the bulk Higgs is tachyonic leading to a vacuum expectation value
(vev) at the TeV scale. The consistency of this picture imposes a set of
constraints on the parameters in the Higgs sector. A novel feature of our
scenario is the emergence of an adjustable bulk profile for the Higgs vev. We
also find a tower of non-tachyonic Higgs KK modes at the weak scale. We
consider an interesting implementation of this ``Off-the-Wall Higgs'' mechanism
where the 5-dimensional curvature-scalar coupling alone generates the tachyonic
mode responsible for EWSB. In this case, additional relations among the
parameters of the Higgs and gravitational sectors are established. We discuss
the experimental signatures of the bulk Higgs in general, and those of the
``Gravity-Induced'' EWSB in particular.


title: Need for fully unintegrated parton densities

abstract:
  Associated with the use of conventional integrated parton densities are
kinematic approximations on parton momenta which result in unphysical
differential distributions for final-state particles. We argue that it is
important to reformulate perturbative QCD results in terms of fully
unintegrated parton densities, differential in all components of the parton
momentum.


title:
Glueball and hybrid mass and decay with string tension below Casimir
  scaling

abstract:
  Lattice computations with excited SU(3) representations suggest that the
confining gluon-gluon interaction complies with the Casimir scaling. The
constituent gluon models have also been assuming the Casimir scaling. Inspired
in type-II superconductors, we explore a new scenario for the gluon-gluon
interaction where the adjoint string is replaced by a pair of fundamental
strings, resulting in a factor of 2, smaller than 9/4. To test our proposal we
construct a simple constituent gluon model, extrapolated from the funnel
potential for quarkonium, and apply it to compute the wave-function of
glueballs and of hybrid gluelumps. From the decay widths of quarkonium, we also
extrapolate the decay widths of the glueballs and hybrid gluelumps. Our
predictions apply to charmonia, lightonia, glueballs and hybrid gluelumps with
large angular momentum.


title: Total Cross Section at Cosmic Ray Energies

abstract:
  Recent analysis of the cosmic ray data together with earlier experimental
measurements at ISR and SPS provides us a sound footing to discuss the behavior
of total cross section at asymptotic energies. We will study the growth of
total cross section at high energies in the light of various theoretical
approaches with special reference to measurements at RHIC and LHC.


title:
Relic Abundance of LKP Dark Matter in UED model including Effects of
  Second KK Resonances

abstract:
  We reevaluate the thermal relic density of the Kaluza-Klein (KK) dark matter
in universal extra dimension models. In particular, we consider the effect of
the resonance caused by second KK particles on the density. We find that the
annihilation cross sections relevant to the density are significantly enhanced
due to the resonance when the Higgs boson mass is large enough (m_h \gtrsim 200
GeV). As a result, the mass of the dark matter particle consistent with the
WMAP observation is increased compared to the result which does not include any
resonance.


title: Threshold resummation for electroweak annihilation from DIS data

abstract:
  We show that higher-order coefficients required to perform threshold
resummation for electroweak annihilation processes, such as Drell-Yan or Higgs
production via gluon fusion, can be computed using perturbative results derived
in Deep Inelastic Scattering. As an example, we compute the three-loop
coefficient D_3, generating most of the fourth tower of threshold logarithms
for the Drell-Yan cross section in the MSbar scheme, using the recent
three-loop results for splitting functions and for the quark form factor, as
well as a class of exponentiating two-loop contributions to the Drell-Yan
process.


title:
Suppression of the neutralino relic density with supersymmetric CP
  violation

abstract:
  We study pair annihilations of the neutralino dark matter in the minimal
supersymmetric standard model with CP violation. We consider the case that the
higgsino mass and the trilinear scalar couplings have CP-violating phases of
order unity, taking a scenario that the scalar fermions in the first two
generations are much heavier than those in the third generation to avoid a
severe constraint from experimental limits on electric dipole moments. It is
found that, when the lightest neutralino ($\chi$) is bino-like, the cross
sections of the $W$-boson pair production $\chi\chi$ $\to$ $W^+W^-$ and the
lightest Higgs boson pair production $\chi\chi$ $\to$ $H^0_2 H^0_2$ for
nonrelativistic neutralinos can be significantly enhanced by the phase of the
higgsino mass. The relic density of the neutralino can be considerably
suppressed by this effect. However, even this suppression is not enough to make
bino-like dark matter consistent with a cosmological constraint. We also
discuss the effect of CP violation on the positron flux from neutralino pair
annihilations in the galactic halo.


title: More about soft terms and FCNC in realistic string constructions

abstract:
  In realistic four-dimensional string constructions the presence of anomalous
U(1)'s is generic. In addition, the associated Fayet-Iliopoulos contribution to
the D-term can break the extra gauge symmetries. As a consequence, physical
particles can appear combined with other states. We show that even if a
three-generation standard-like model has originally flavour-independent soft
scalar masses, the particle mixing contribution may generate non-universality
among them. Thus FCNC effects which were apparently absent reappear. We also
discuss the size of these contributions in an explicit model, and how they can
be suppressed.


title: QCD Factorization and Rare B Meson Decays

abstract:
  Some recent progress in China in the study of charmless B decays with QCD
factorization is reviewed. Chirally enhanced power corrections and infrared
divergence problem are stressed.


title: X(1835) as the Lowest Mass Pseudoscalar Glueball and Proton Spin Problem

abstract:
  We consider the parity doublet structure observed in high hadronic
excitations within the instanton model for the QCD vacuum. In the conventional
approach this doubling phenomenon is treated as a manifestation of the partial
restoration of chiral or $U(1)_A$ symmetry. We demonstrate that the suppression
of direct instanton contribution to the masses of excited hadrons leads to the
partial $U(1)_A$ symmetry restoration in hadron spectrum. The origin of X(1835)
resonance observed by BES Collaboration is studied upon the doublet structure.
We argue also how X(1835) be interpreted as the lowest pseudoscalar glueball
state, and derive its coupling constant to proton. It turns out that this
coupling is large and negative. Demonstrated is how this large coupling affects
the gluonic contribution to the proton spin.


title:
Moments of the particle phase-space density at freeze-out and
  coincidence probabilities

abstract:
  It is pointed out that the moments of phase-space particle density at
freeze-out can be determined from the coincidence probabilities of the events
observed in multiparticle production. A method to measure the coincidence
probabilities is described and its validity examined.


title:
Associated single photons as signals for a doubly charged scalar at
  linear e-e- colliders

abstract:
  Doubly charged scalars, predicted in many models having exotic Higgs
representations, can in general have lepton-number violating (LFV) couplings.
The basis of most searches for this charged scalar has been to look for its
direct production and its subsequent decay to like-sign final state leptons. In
this work we show that by using an associated monoenergetic final state photon
seen at a future linear e-e- collider, we can have a clear and distinct
signature for a doubly-charged resonance and also determine its mass rather
precisely. We also estimate the strength of the Delta L=2 coupling which can be
probed in this way at sqrt{s}=1 TeV, as a function of the recoil mass of the
doubly-charged scalar.


title: Multi-Particle Processes in QCD without Feynman Diagrams

abstract:
  A way to efficiently compute helicity amplitudes for arbitrary tree-level
scattering processes in QCD is presented. The scattering amplitude is evaluated
recursively through a set of Dyson-Schwinger equations. The computational cost
of this algorithm grows asymptotically as 3^n, where n is the number of
particles involved in the process, compared to n! in the traditional Feynman
graphs approach. Unitary gauge is used and mass effects are available as well.
Additionally,the color and helicity structures are appropriately transformed so
the usual summation is replaced by the Monte Carlo techniques.


title:
Determination of $\gamma$ from the $\eta - \eta'$ mixing within QCD
  Factorization

abstract:
  The charmless nonleptonic $B\to \eta K$ decay is an useful probe to test the
strong interaction dynamics part of the Standard Model. Within the QCD
factorization framework, we analyse this particular decay by using the most
recent data of $BR(B^+ \to \eta K^+)$ and $A_{cp}(B^+ \to \eta K^+)$ available
in the Heavy Flavour Averaging Group (HFAG) webcite. Using these data we
constraint the unitarity angle $\gamma$ and $\eta-\eta'$ mixing angle $\theta$.
We find that such constraint is scale dependent, e.g. for $\gamma = 70^o$, the
data for $BR(B^+ \to \eta K^+)$ (= $(2.6 \pm 0.5)\times 10^{-6}$) suggests that
$\theta$ should lie in between $-46^o$ and $-44^o$, $-30^o$ and $-26^o$ for
$\mu = m_b/2$. For $\mu = m_b$, the same $BR$ data (with the same $\gamma$)
suggests that $\theta$ should lie in between $-54^o$ and $-50^o$, $-30^o$ and
$-26^o$. The allowed region followed from $A_{cp}=-0.25\pm 0.14$, is found to
be rather wider than that obtained from the $BR(B^+ \to \eta K^+)$ data. For
$\gamma=70^o$ and $\theta = -21.3^o$, we find $BR(B^-(+) \to \eta K^-(+))=
2.93(4.91) \times 10^{-6}$ and $A_{cp}=-0.252$ at $\mu=m_b$, and about $
2.98(5.72) \times 10^{-6}$ and -0.315 corresponding to $\mu=m_b/2$. We
investigate the role of the power corrections in such constraints.


title: Higgs Production in Association with Bottom Quarks at Hadron Colliders

abstract:
  We review the present status of the QCD corrected cross sections and
kinematic distributions for the production of a Higgs boson in association with
bottom quarks at the Fermilab Tevatron and CERN Large Hadron Collider. Results
are presented for the Minimal Supersymmetric Standard Model where, for large
tan beta, these production modes can be greatly enhanced compared to the
Standard Model case. The next-to-leading order QCD results are much less
sensitive to the renormalization and factorization scales than the lowest order
results, but have a significant dependence on the choice of the renormalization
scheme for the bottom quark Yukawa coupling. We also investigate the
uncertainties coming from the Parton Distribution Functions and find that these
uncertainties can be comparable to the uncertainties from the remaining scale
dependence of the next-to-leading order results. We present results separately
for the different final states depending on the number of bottom quarks
identified.


title: Neutrino Oscillations in the Early Universe: A Real Time Formulation

abstract:
  Neutrino oscillations in the early Universe prior to the epoch of primordial
nucleosynthesis is studied by implementing real time non-equilibrium field
theory methods. We focus on two flavors of Dirac neutrinos, however, the
formulation is general. We obtain the equations of motion for neutrino
wavepackets of either chirality and helicity in the plasma allowing for CP
asymmetry. Contributions non-local in space-time to the self-energy dominate
over the asymmetry for $T \gtrsim 3-5 \mathrm{MeV}$ if the lepton and neutrino
asymmetries are of the same order as the baryon asymmetry. We find a new
contribution which cannot be interpreted as the usual effective potential. The
mixing angles and dispersion relations in the medium depend on \emph{helicity}.
We find that resonant transitions are possible in the temperature range $ 10
\lesssim T \ll 100 \mathrm{MeV} $. Near a resonance in the mixing angle, the
oscillation time scale in the medium as compared to the vacuum is
\emph{slowed-down} substantially for small vacuum mixing angle. The time scale
of oscillations \emph{speeds-up} for off resonance high energy neutrinos for
which the mixing angle becomes vanishingly small. The equations of motion
reduce to the familiar oscillation formulae for negative helicity
ultrarelativistic neutrinos, but include consistently both the \emph{mixing
angle and the oscillation frequencies in the medium}. These equations of motion
also allow to study the dynamics of right handed as well as positive helicity
neutrinos.


title: Two-boson truncation of Pauli-Villars-regulated Yukawa theory

abstract:
  We apply light-front quantization, Pauli-Villars regularization, and
numerical techniques to the nonperturbative solution of the dressed-fermion
problem in Yukawa theory in 3+1 dimensions. The solution is developed as a
Fock-state expansion truncated to include at most one fermion and two bosons.
The basis includes a negative-metric heavy boson and a negative-metric heavy
fermion in order to provide the necessary cancellations of ultraviolet
divergences. The integral equations for the Fock-state wave functions are
solved by reducing them to effective one-boson--one-fermion equations for
eigenstates with J_z=1/2. The equations are converted to a matrix equation with
a specially tuned quadrature scheme, and the lowest mass state is obtained by
diagonalization. Various properties of the dressed-fermion state are then
computed from the nonperturbative light-front wave functions. This work is a
major step in our development of Pauli-Villars regularization for the
nonperturbative solution of four-dimensional field theories and represents a
significant advance in the numerical accuracy of such solutions.


title:
Probing small $x$ parton densities in ultraperipheral $AA$ and $pA$
  collisions at the LHC

abstract:
  We calculate production rates for several hard processes in ultraperipheral
proton-nucleus and nucleus-nucleus collisions at the LHC. The resulting high
rates demonstrate that some key directions in small $x$ research proposed for
HERA will be accessible at the LHC through these ultraperipheral processes.
Indeed, these measurements can extend the HERA $x$ range by roughly a factor of
10 for similar virtualities. Nonlinear effects on the parton densities will
thus be significantly more important in these collisions than at HERA.


title: Proposal for a Supersymmetric Standard Model

abstract:
  The fact that neutrinos are massive suggests that the minimal supersymmetric
standard model (MSSM) might be extended in order to include three gauge-singlet
neutrino superfields with Yukawa couplings of the type $H_2 L \nu^c$. We
propose to use these superfields to solve the $\mu$ problem of the MSSM without
having to introduce an extra singlet superfield as in the case of the
next-to-MSSM (NMSSM). In particular, terms of the type $\nu^c H_1 H_2$ in the
superpotential may carry out this task spontaneously through sneutrino vacuum
expectation values. In addition, terms of the type $(\nu^c)^3$ avoid the
presence of axions and generate effective Majorana masses for neutrinos at the
electroweak scale. On the other hand, these terms break lepton number and
R-parity explicitly implying that the phenomenology of this model is very
different from the one of the MSSM or NMSSM. For example, the usual neutralinos
are now mixed with the neutrinos. For Dirac masses of the latter of order
$10^{-4}$ GeV, eigenvalues reproducing the correct scale of neutrino masses are
obtained.


title: Baryon asymmetry in the Universe resulting from Lorentz violation

abstract:
  We analyze the phenomenological consequences of a Lorentz violating
energy-momentum dispersion relation in order to give a simple explanation for
the baryon asymmetry in the Universe. By assuming very few hypotheses, we
propose a straightforward mechanism for generating the observed
matter-antimatter asymmetry which entails a Lorentz-breakdown energy scale of
the order of the Greisen-Zatsepin-Kuzmin cut-off.


title: Probing new physics with coherent neutrino scattering off nuclei

abstract:
  The possibility off measuring for the first time neutrino-nuclei coherent
scattering has been recently discussed by several experimental collaborations.
It is shown that such a measurement may be very sensitive to non-standard
interactions of neutrinos with quarks and might set better constraints than
those coming from future neutrino factory experiments. We also comment on other
types of new physics tests, such as extra heavy neutral gauge bosons, where the
sensitivity to some models is slightly better than the Tevatron constraint and,
therefore, could give complementary bounds.


title:
CP Asymmetry, Branching ratios and Isospin breaking effects in B-> rho
  gamma and B-> omega gamma decays with the pQCD approach

abstract:
  The radiative B-> rho gamma, B-> omega gamma decay modes are caused by the
FCNC process, so they give us good insight towards probing the standard model
in order to search for new physics. In this paper, we compute the branching
ratio, direct CP asymmetry, and isospin breaking effects using the perturbative
QCD approach within the standard model.


title:
Seesaw Mass Matrix Model of Quarks and Leptons with Flavor-Triplet Higgs
  Scalars

abstract:
  In a seesaw mass matrix model M_f = m_L M_F^{-1} m_R^\dagger with a universal
structure of m_L \propto m_R, as the origin of m_L (m_R) for quarks and eptons,
flavor-triplet Higgs scalars whose vacuum expectation values v_i are
proportional to the square roots of the charged lepton masses m_{ei}, i.e. v_i
\propto \sqrt{m_{ei}}, are assumed. Then, it is investigated whether such a
model can explain the observed neutrino masses and mixings (and also quark
masses and mixings) or not.


title:
A new approach for calculating the Nambu-Gorkov propagator in color
  superconductivity theory

abstract:
  In this article, we propose a new approach to calculate the Nambu-Gorkov
propagator intuitively with some linear algebra techniques in presence of the
scalar diquark condensates. With the help of energy projective operators, we
can obtain relatively simple expressions for the quark propagators, which
greatly facilitate the calculations in solving the Schwinger-Dyson equation to
obtain the gap parameters.


title: Generalized S-matrix in Mixed Representations

abstract:
  A generalized scattering amplitude where momenta of incoming-particles and
outgoing-particles as well as positions of incoming-particles and
outgoing-particles are specified is formulated. Idealistic beams and idealistic
measuring instruments where momenta and positions satisfy minimum uncertainty
are studied with a use of minimum wave packets, coherent states. In the present
work, we show general features of the generalized scattering amplitudes based
on ${\phi}^4$ theory. We give a proof of completeness of many body states,
asymptotic behaviors in the large distance region, and factorization of the
amplitudes. Despite of the non-orthogonal properties of wave packets, we found
that the probability interpretation is verified. A differential probability
depends upon the wave packet size but a total probability that is integrated in
the final states is independent from the size of final state wave packet and
becomes universal. Few body amplitudes are studied as examples.


title: Comparison and combination of ZEUS and H1 PDF analyses

abstract:
  The H1 and ZEUS published PDF analyses are compared, including a discussion
of the different treatments of correlated systematic uncertainties. Differences
in the data sets and the analyses are investigated by putting the H1 data set
through both PDF analyses and by putting the ZEUS and H1 data sets through the
same (ZEUS) analysis, separately. Finally the HERA averaged data set is put
through the ZEUS PDF analysis and the result is compared to that obtained when
putting the ZEUS and H1 data sets through this analysis together, using both
the
  Offset and the Hessian methods of treating correlated systematic
uncertainties.


title:
Symmetry of Anomalous Dimension Matrices for Colour Evolution of Hard
  Scattering Processes

abstract:
  In a recent paper, Dokshitzer and Marchesini rederived the anomalous
dimension matrix for colour evolution of $gg \to gg$ scattering, first derived
by Kidonakis, Oderda and Sterman. They noted a weird symmetry that it possesses
under interchange of internal (colour group) and external (scattering angle)
degrees of freedom and speculated that this may be related to an embedding into
a context that correlates internal and external variables such as string
theory.
  In this short note, I point out another symmetry possessed by all the colour
evolution anomalous dimension matrices calculated to date. It is more prosaic,
but equally unexpected, and may also point to the fact that colour evolution
might be understood in some deeper theoretical framework. To my knowledge it
has not been pointed out elsewhere, or anticipated by any of the authors
calculating these matrices. It is simply that, in a suitably chosen colour
basis, they are complex symmetric matrices.


title: Energy loss of muons and taus through inelastic scattering on nuclei

abstract:
  A hybrid model is used to describe the energy loss of very high-energy taus
and muons in matter due to inelastic scattering on nuclei. The model involves
soft and semihard photonuclear interactions as well as the deep inelastic
scattering including the weak neutral current processes. For the lepton
scattering on nuclei all important nuclear effects, the shadowing,
anti-shadowing, EMC and the nucleon binding, were taken into account.
Approximating formulas for the muon and tau energy loss portion by the
inelastic scattering on nuclei in water are given for wide energy range up to
$10^9$ GeV.


title: Gauge invariance in two-particle scattering

abstract:
  It is shown how gauge invariance is obtained for the coupling of a photon to
a two-body state described by the solution of the Bethe-Salpeter equation. This
is illustrated both for a complex scalar field theory and for interaction
kernels derived from chiral effective Lagrangians.


title: Semi-Numerical Evaluation of One-Loop Corrections

abstract:
  We present a semi-numerical algorithm to calculate one-loop virtual
corrections to scattering amplitudes. The divergences of the loop amplitudes
are regulated using dimensional regularization. We treat in detail the case of
amplitudes with up to five external legs and massless internal lines, although
the method is more generally applicable. Tensor integrals are reduced to
generalized scalar integrals, which in turn are reduced to a set of known basis
integrals using recursion relations. The reduction algorithm is modified near
exceptional configurations to ensure numerical stability. To test the procedure
we apply these techniques to one-loop corrections to the Higgs to four quark
process for which analytic results have recently become available.


title: B-Meson Mixing and Lifetimes

abstract:
  $B_d$ and $B_s$ meson systems play a fundamental role to test and improve our
understanding of Standard Model flavor dynamics. The mixing parameters $\Delta
m_{d,s}$ represent important constraints in the unitarity triangle analysis.
Their theoretical estimates require non-perturbative calculations of B-meson
decay constants and B-parameters; accurate results, recently obtained from the
lattice, are reviewed. Other phenomenologically interesting quantities are the
beauty hadron lifetime ratios and, the width differences and CP-violation
parameters in $B_d$ and $B_s$ systems. We discuss their theoretical predictions
which, in the last four years, have been improved thanks to accurate lattice
calculations and next-to-leading order perturbative computations.


title:
Nonlinear k_\perp-factorization for Gluon-Gluon Dijets Produced off
  Nuclear Targets

abstract:
  The origin of the breaking of conventional linear k_\perp-factorization for
hard processes in a nuclear environment is by now well established. The
realization of the nonlinear nuclear k_\perp-factorization which emerges
instead was found to change from one jet observable to another. Here we report
on an important technical progress, the evaluation of the four-gluon color
dipole cross section operator. It describes the coupled seven-channel
non-Abelian intranuclear evolution of the four-gluon color-singlet states. An
exact diagonalization of this seven-channel problem is possible for large
number of colors N_c and allows a formulation of nonlinear
k_\perp-factorization for production of gluon-gluon dijets. The momentum
spectra for dijets in all possible color representations are reported in the
form of explicit quadratures in terms of the collective nuclear unintegrated
glue. Our results fully corroborate the concept of universality classes.


title:
Enhancement of "CP-odd" Higgs Boson Production in the Minimal
  Supersymmetric Standard Model with Explicit CP Violation

abstract:
  We calculate the production cross section of the ``CP-odd'' Higgs boson via
gluon fusion in the minimal supersymmetric standard model with explicit CP
violation in the stop sector. We show that there is a parameter region in which
the cross section is enhanced by a factor of about 1000, as compared to the
case without CP violation in the stop sector. In the parameter region where the
``CP-odd'' Higgs boson can decay into a stop pair, the stop pair events will be
the important signature of the enhanced ``CP-odd'' Higgs boson. In the case
where the ``CP-odd'' Higgs boson cannot decay into any superparticles, the
gamma gamma and tau tau decay channels could become important for discovering
the ``CP-odd'' Higgs boson. We also discuss the constraints from electric
dipole moments of electron, neutron and mercury on the viable parameter space
mentioned above.


title: Exotic Neutrino Interactions at the Pierre Auger Observatory

abstract:
  The Pierre Auger Observatory for cosmic rays provides a laboratory for
studying fundamental interactions at energies well beyond those available at
colliders. In addition to hadrons or photons, Auger is sensitive to ultra-high
energy neutrinos in the cosmic radiation and models for new physics can be
explored by observing neutrino interactions at center-of-mass energies beyond
the TeV scale. By comparing the rate for quasi-horizontal, deeply penetrating
air showers triggered by all types of neutrinos with the rate for slightly
upgoing showers generated by Earth-skimming tau neutrinos, any deviation of the
neutrino-nucleon cross-section from the Standard Model expectation can be
constrained. We show that this can test models of low-scale quantum gravity
(including processes such as Kaluza-Klein graviton exchange, microscopic black
hole production and string resonances), as well as non-perturbative electroweak
instanton mediated processes. Moreover, the observed ratios of neutrino flavors
would severely constrain the possibility of neutrino decay.


title: Identifying the NMSSM by the interplay of LHC and ILC

abstract:
  The interplay between the LHC and the $e^+ e^-$ International Linear Collider
(ILC) with $\sqrt{s}=500$ GeV might be crucial for the discrimination between
the minimal and next-to-minimal supersymmetric standard model. We present an
NMSSM scenario, where the light neutralinos have a significant singlino
component, that cannot be distinguished from the MSSM by cross sections and
mass measurements. Mass and mixing state predictions for the heavier
neutralinos from the ILC analysis at different energy stages and comparison
with observation at the LHC, lead to clear identification of the particle
character and identify the underlying supersymmetric model.


title:
The 2-3 symmetry: Flavour Changing $b$, $\tau$ Decays and Neutrino
  Mixing

abstract:
  The observed pattern of neutrino mixing may be the result of a 2-3($ \mu-
\tau$) symmetry in the leptonic sector. We consider a two Higgs doublet model
with a 2-3 symmetry in the down type quark and the charged lepton sector. The
breaking of the 2-3 symmetry by the strange quark mass and the muon mass leads
to FCNC in the quark sector and the charged lepton sector that are suppressed
by ${m_s \over m_b}$ and ${m_{\mu} \over m_{\tau}}$ in addition to the mass of
the heavy Higgs boson of the second Higgs doublet. A Higgs boson mass of $ m_H
\sim 600 - 900$ GeV can explain the deviation from standard model reported in
several rare B decays. Predictions for other B decays are made and a new CP
phase is predicted in $B_{s}-{\bar{B}_{s}}$ mixing. The lepton flavour
violating decays $ \tau \to \mu \bar{l}(\bar{q}) l(q)$ are below the
experimental limits. The breaking of 2-3 symmetry in the lepton sector can lead
to deviations of the atmospheric neutrino mixing angle from the maximal value
by $ \sim 2$ degrees.


title: Event generator for the LHC

abstract:
  In this contribution the new event generation framework Sherpa will be
presented. It aims at the full simulation of events at current and future
high-energy experiments, in particular the LHC. Some results related to the
production of jets at the Tevatron will be discussed.


title: Cosmology and spacetime symmetries

abstract:
  Cosmological models often contain scalar fields, which can acquire global
nonzero expectation values that change with the comoving time. Among the
possible consequences of these scalar-field backgrounds, an accelerated
cosmological expansion, varying couplings, and spacetime-symmetry violations
have recently received considerable attention. This talk studies the interplay
of these three key signatures of cosmologically varying scalars within a
supergravity framework.


title:
Study of the gluon propagator in the large-N_f limit at finite
  temperature and chemical potential for weak and strong couplings

abstract:
  At finite temperature and chemical potential, the leading-order
(hard-thermal-loop) contributions to the gauge-boson propagator lead to
momentum-dependent thermal masses for propagating quasiparticles as well as
dynamical screening and Landau damping effects. We compare the
hard-thermal-loop propagator with the complete large-N_f gluon propagator, for
which the usually subleading contributions, such as a finite width of
quasiparticles, can be studied at nonperturbatively large effective coupling.
We also study quantitatively the effect of Friedel oscillations in
low-temperature electrostatic screening.


title:
Contour-improved versus fixed-order perturbation theory in hadronic tau
  decays

abstract:
  The hadronic decay rate of the tau lepton serves as one of the most precise
determinations of the QCD coupling alpha_s. The dominant theoretical source of
uncertainty at present resides in the seeming disparity of two approaches to
improving the perturbative expansion with the help of the renormalisation
group, namely fixed-order and contour-improved perturbation theory. In this
work it is demonstrated that in fact both approaches yield compatible results.
However, the fixed-order series is found to oscillate around the
contour-improved result with an oscillation frequency of approximately six
perturbative orders, approaching it until about the 30th order, after which the
expansion reveals its asymptotic nature. Additionally, the renormalisation
scale and scheme dependencies of the perturbative series for the tau hadronic
width are investigated in detail.


title: Dynamically Warped Theory Space and Collective Supersymmetry Breaking

abstract:
  We study deconstructed gauge theories in which a warp factor emerges
dynamically and naturally. We present nonsupersymmetric models in which the
potential for the link fields has translational invariance, broken only by
boundary effects that trigger an exponential profile of vacuum expectation
values. The spectrum of physical states deviates exponentially from that of the
continuum for large masses; we discuss the effects of such exponential towers
on gauge coupling unification. We also present a supersymmetric example in
which a warp factor is driven by Fayet-Iliopoulos terms. The model is peculiar
in that it possesses a global supersymmetry that remains unbroken despite
nonvanishing D-terms. Inclusion of gravity and/or additional messenger fields
leads to the collective breaking of supersymmetry and to unusual phenomenology.


title: QEDXQCD Exponentiation and Shower/ME Matching at the LHC

abstract:
  We present the elements of QEDXQCD exponentiation and its interplay with
shower/ME matching in precision LHC physics scenarios. Applications to single
heavy gauge boson production at hadron colliders are illustrated.


title:
A new determination of the electromagnetic nucleon form factors from QCD
  Sum Rules

abstract:
  We obtain the electromagnetic form factors of the nucleon, in the space-like
region, using three-point function Finite Energy QCD Sum Rules. The QCD
calculation is performed to leading order in perturbation theory in the chiral
limit, and also to leading order in the non-perturbative power corrections. For
the Dirac form factor, $F_1(q^2)$, we get a very good agreement with the data
for both the proton and the neutron, in the currently accessible experimental
region of momentum transfers. Unfortunately this is not the case, though, for
the Pauli form factor $F_2(q^2)$, which has a soft $q^2$-dependence
proportional to the quark condensate $<0|\bar{q}q|0>$.


title: Measurement of lepton flavor violating Yukawa couplings at ILC

abstract:
  We discuss lepton flavor violation (LFV) associated with tau leptons in the
general framework of the two Higgs doublet model, in which LFV couplings are
introduced as a deviation from Model II Yukawa interaction. Parameters of the
model are constrained from experimental results and also from requirements of
theoretical consistencies such as vacuum stability and perturbative unitarity.
Current data for LFV rare tau decays provide substantial upper limits on the
LFV Yukawa couplings in the large $\tan\beta$ region, which are comparable with
predictions in fundamental theories. Here $\tan\beta$ is the ratio of vacuum
expectation values of the two Higgs doublets. A search for the LFV decays
$\phi^{0} \to \tau^\pm \mu^\mp$ $(\tau^\pm e^\mp)$ of neutral Higgs bosons
($\phi^{0} =h,H$ and $A$) at future collider experiments can be useful to
further constrain the LFV couplings, especially in the relatively small
$\tan\beta$ region ($\tan\beta \lesssim 30 $), where rare tau decay data cannot
give any strong limit.


title: Baryon Number Violation Involving Higher Generations

abstract:
  Proton stability seems to constrain rather strongly any baryon number
violating process. We investigate the possibility of baryon number violating
processes involving right-handed dynamics or higher generation quarks. Our
results strongly suggest that there will be no possibility to observe baryon
number violation in tau or higher generation quark decays, at any future
machine.


title: Surface Integral of Babu Diagram

abstract:
  We point out that the surface integral of the Babu diagram gives non-trivial
main contribution independent of the charged lepton masses and the scale of new
physics. It can fit the experimental data on both solar and atmospheric
neutrino oscillations. However, then the coupling constants of the new Higgs
singlets with the leptons gain values smaller than that in the usual two-loop
radiative analyses. This yields distinction between our consideration on
ultraviolet-behaviors and the former based on the infrared radiative
corrections.


title: The multiplets of finite width 0++ mesons and encounters with exotics

abstract:
  Complex-mass (finite-width) $0^{++}$ nonet and decuplet are investigated by
means of exotic commutator method. The hypothesis of vanishing of the exotic
commutators leads to the system of master equations (ME). Solvability
conditions of these equations define relations between the complex masses of
the nonet and decuplet mesons which, in turn, determine relations between the
real masses (mass formulae), as well as between the masses and widths of the
mesons. Mass formulae are independent of the particle widths. The masses of the
nonet and decuplet particles obey simple ordering rules. The nonet mixing angle
and the mixing matrix of the isoscalar states of the decuplet are completely
determined by solution of ME; they are real and do not depend on the widths.
All known scalar mesons with the mass smaller than $2000MeV$ (excluding
$\sigma(600)$) and one with the mass $2200\div2400MeV$ belong to two
multiplets: the nonet $(a_0(980), K_0(1430), f_0(980), f_0(1710))$ and the
decuplet $(a_0(1450), K_0(1950), f_0(1370), f_0(1500), f_0(2200)/f_0(2330))$.
It is shown that the famed anomalies of the $f_0(980)$ and $a_0(980)$ widths
arise from an extra "kinematical" mechanism, suppressing decay, which is not
conditioned by the flavor coupling constant. Therefore, they do not justify
rejecting the $q\bar{q}$ structure of them. A unitary singlet state (glueball)
is included into the higher lying multiplet (decuplet) and is divided among the
$f_0(1370)$ and $f_0(1500)$ mesons. The glueball contents of these particles
are totally determined by the masses of decuplet particles. Mass ordering rules
indicate that the meson $\sigma(600)$ does not mix with the nonet particles.


title: Precision Empirical Mass Formulae for Baryon Octet and Decuplet

abstract:
  Empirical mass formulae for the baryon octet and decuplet are presented.
These formulae are functions of one integer variable and charge state of the
baryons. With an exception of Lambda(1116), the formulae generate masses within
0.1% of the observed masses. The formulae also generate the same
electromagnetic mass splittings predicted by SU(6)model. Spin 1/2 octet
resonances and its relation to the octet mass formula is described.


title:
Precision physics of simple atoms: QED tests, nuclear structure and
  fundamental constants

abstract:
  Quantum electrodynamics is the first successful and still the most successful
quantum field theory. Simple atoms, being essentially QED systems, allow highly
accurate theoretical predictions. Because of their simple spectra, such atoms
have been also efficiently studied experimentally frequently offering the most
precisely measured quantities. Our review is devoted to comparison of theory
and experiment in the field of precision physics of light simple atoms. In
particular, we consider the Lamb shift in the hydrogen atom, the hyperfine
structure in hydrogen, deuterium, helium-3 ion, muonium and positronium, as
well as a number of other transitions in positronium. Additionally to a
spectrum of unperturbed atoms, we consider annihilation decay of positronium
and the g factor of bound particles in various two-body atoms. Special
attention is paid to the uncertainty of the QED calculations due to the
uncalculated higher-order corrections and effects of the nuclear structure. We
also discuss applications of simple atoms to determination of several
fundamental constants.