title: Ritorno radiativo per la misura di R: come e perche

abstract:
  The measurement of the pion form factor and, more generally, of the cross
section for electron--positron annihilation into hadrons through the radiative
return has become an important task for high luminosity colliders such as the
$\Phi$- or $B$-meson factories. This quantity is crucial for predictions of the
hadronic contributions to $(g-2)_\mu$, the anomalous magnetic moment of the
muon, and to the running of the electromagnetic coupling. But the radiative
return opens also the possibility of many other physical applications. The
physics potential of this method at high luminosity meson factories is
discussed and recent results are reviewed.


title: The renormalized B-meson light-cone distribution amplitude

abstract:
  I discuss the renormalization-group equation governing the leading order
light-cone distribution amplitude of the B-meson phi^B_+(omega,mu) and its
exact analytic solution. The solution displays two features concerning the
asymptotic behaviour of phi^B_+(omega,mu) for small and large values of omega.
I comment on further applications and argue that the loss of normalizability is
not a problem in practice.


title: Universal Extra Dimensions and Charged LKPs

abstract:
  We consider the possibility of charged stable Kaluza-Klein leptons in
orbifold models in which all the Standard Model fields propagate (UED models).
At tree level the masses of the 1st mode states are nearly identical and
kinematics can prevent the decays of the 1st mode charged leptons. Perturbative
and non-perturbative affects alter this picture and allow for a range of
possibilities. For single extra dimensional UED-type models with stable
Kaluza-Klein charged leptons we calculate their production from the
all-particle incident flux of cosmic rays and find that null results in direct
searches for anomalously heavy water suggest a lower bound on the
compactification scale: 1/R > 290 GeV.


title: Fermion Masses and Coupling Unification in E6. Life in the Desert

abstract:
  We present an $E_6$ Grand Unified model with a realistic pattern of fermion
masses. All standard model fermions are unified in three fundamental 27-plets
(i.e. supersymmetry is not invoked), which involve in addition right handed
neutrinos and three families of vector like heavy quarks and leptons. The
lightest of those can lie in the low TeV range, being accessible to future
collider experiments. Due to the high symmetry, the masses and mixings of all
fermions are closely related. The new heavy fermions play a crucial role for
the quark and lepton mass matrices and the bilarge neutrino oscillations. In
all channels generation mixing and ${\cal CP}$ violation arise from a single
antisymmetric matrix. The $E_6$ breaking proceeds via an intermediate energy
region with $SU(3)_L\tm SU(3)_R\tm SU(3)_C$ gauge symmetry and a discrete
left-right symmetry. This breaking pattern leads in a straightforward way to
the unification of the three gauge coupling constants at high scales, providing
for a long proton lifetime. The model also provides for the unification of the
top, bottom and tau Yukawa couplings and for new interesting relations in
flavor and generation space.


title: Charmonium Options for the X(3872)

abstract:
  In this paper we consider all possible 1D and 2P ccbar assignments for the
recently discovered X(3872). Taking the experimental mass as input, we give
numerical results for the E1 radiative widths as well as the three principal
types of strong decays; open-charm, ccbar annihilation and closed-charm
hadronic transitions. We find that many assignments may be immediately
eliminated due to the small observed total width. The remaining viable ccbar
assignments are 3D3, 3D2, 1D2, 2 3P1 and 2 1P1. A search for the mode J/psi pi0
pi0 can establish the C-parity of the X(3872), which will eliminate many of
these possibilities. Radiative transitions can then be used to test the
remaining assignments, as they populate characteristic final states. The 3D2
and 1D2 states are predicted to have large (ca.50%) radiative branching
fractions to chi_1 gamma and h_c gamma respectively. We predict that the 3D3
will also be relatively narrow and will have a significant (ca.10%) branching
fraction to chi_2 gamma, and should also be observable in B decay. Tests for
non-ccbar X(3872) assignments are also discussed.


title: Relating Final State Interactions in $B\to D\pi$ and $B\to DK$

abstract:
  A Regge model calculation relates the strong phase in $B \to DK$ to that in
$B\to D\pi$. This provides a significant test of a hadronic picture of final
state interactions in B decays.


title:
Photoproduction of Quarkonium in Proton-Proton and Nucleus-Nucleus
  Collisions

abstract:
  We discuss the photoproduction of $\Upsilon$ and $J/\psi$ at high energy
$\bar{p}p$, $pp$ and heavy ion colliders. We predict large rates in $\bar{p}p$
interactions at the Fermilab Tevatron %and in heavy-ion interactions at the
CERN LHC. These reactions can be and in $pp$ and heavy-ion interactions at the
CERN LHC. The $J/\psi$ is also produced copiously at RHIC. These reactions can
be used to study the gluon distribution in protons and heavy nuclei. We also
show that the different CP symmetries of the initial states lead to large
differences in the transverse momentum spectra of mesons


title: Topped MAC with extra dimensions?

abstract:
  We perform the most attractive channel (MAC) analysis in the top mode
standard model with TeV-scale extra dimensions, where the standard model gauge
bosons and the third generation of quarks and leptons are put in D(=6,8,10,...)
dimensions. In such a model, bulk gauge couplings rapidly grow in the
ultraviolet region. In order to make the scenario viable, only the attractive
force of the top condensate should exceed the critical coupling, while other
channels such as the bottom and tau condensates should not. We then find that
the top condensate can be the MAC for D=8, whereas the tau condensation is
favored for D=6. The analysis for D=10 strongly depends on the regularization
scheme. We predict masses of the top (m_t) and the Higgs (m_H), m_t=172-175 GeV
and m_H=176-188 GeV for D=8, based on the renormalization group for the top
Yukawa and Higgs quartic couplings with the compositeness conditions at the
scale where the bulk top condenses. The Higgs boson in such a characteristic
mass range will be immediately discovered in H -> WW^(*)/ZZ^(*) once the LHC
starts.


title:
Probing New Physics from Top-charm Associated Productions at Linear
  Colliders

abstract:
  The top-charm associated productions via $e^+ e^-$, $e^- \gamma$ and $\gamma
\gamma$ collisions at linear colliders, which are extremely suppressed in the
Standard Model (SM), could be significantly enhanced in some extensions of the
SM. In this article we calculate the full contribution of the topcolor-assisted
technicolor (TC2) to these productions and then compare the results with the
existing predictions of the SM, the general two-Higgs-doublet model and the
Minimal Supersymmetric Model. We find that the TC2 model predicts much larger
production rates than other models and the largest-rate channel is $\gamma
\gamma \to t \bar{c}$, which exceeds 10 fb for a large part of the parameter
space. From the analysis of the observability of such productions at the future
linear colliders, we find that the predictions of the TC2 model can reach the
observable level for a large part of the parameter space while the predictions
of other models are hardly accessible.


title:
SDECAY: a Fortran code for the decays of the supersymmetric particles in
  the MSSM

abstract:
  We present the Fortran code SDECAY, which calculates the decay widths and
branching ratios of all the supersymmetric particles in the Minimal
Supersymmetric Standard Model, including higher order effects. Besides the
usual two-body decays of fermions and gauginos and the three-body decays of
charginos, neutralinos and gluinos, we have also implemented the three-body
decays of top squarks, and even the four-body decays of the top squark; the
important loop-induced decay modes are also included. The QCD corrections to
the two-body decays involving strongly interacting particles and the dominant
components of the electroweak corrections to all decay modes are implemented.


title:
Quenching of Hadron Spectra due to the Collisional Energy Loss of
  Partons in the Quark-Gluon Plasma

abstract:
  We estimate the energy loss distribution and investigate the quenching of
hadron spectra in ultrarelativistic heavy-ion collisions due to the collisional
energy loss of energetic partons from hard parton collisions in the initial
stage.


title: CP violation in production of neutralinos in e+ e- collisions

abstract:
  We propose T-odd and CP-odd odd asymmetries in order to analyze the impact of
CP violating phases in neutralino production and subsequent leptonic two-body
decays. We present numerical results of these asymmetries and of the cross
sections for complex parameters \mu, M_1 and A_\tau, which may be present in
the neutralino and stau sector of the Minimal Supersymmetric Standard Model if
CP is violated. The asymmetries arise on tree level and thus could be large
enough to be observed at a linear e+e- collider in the \sqrt{s}=500 GeV range
with high luminosity. We discuss the feasibility for measuring the asymmetries
by analyzing their statistical errors. Moreover we study the beam polarization
dependence of the asymmetries and of the cross sections and show that they both
can be enhanced considerably.


title: Learning the weak phase $\gamma$ from B decays

abstract:
  The current status of some methods to determine the weak phase $\gamma$ of
the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $V^*_{ub}$ using B decays is
discussed, and comments are made on accuracy achievable in the next few years.


title:
Testing the running of the cosmological constant with Type Ia Supernovae
  at high z

abstract:
  Within the Quantum Field Theory context the idea of a "cosmological constant"
(CC) evolving with time looks quite natural as it just reflects the change of
the vacuum energy with the typical energy of the universe. In the particular
frame of Ref.[30], a "running CC" at low energies may arise from generic
quantum effects near the Planck scale, M_P, provided there is a smooth
decoupling of all massive particles below M_P. In this work we further develop
the cosmological consequences of a "running CC" by addressing the accelerated
evolution of the universe within that model. The rate of change of the CC stays
slow, without fine-tuning, and is comparable to H^2 M_P^2. It can be described
by a single parameter, \nu, that can be determined from already planned
experiments using SNe Ia at high z. The range of allowed values for \nu follow
mainly from nucleosynthesis restrictions. Present samples of SNe Ia can not yet
distinguish between a "constant" CC or a "running" one. The numerical
simulations presented in this work show that SNAP can probe the predicted
variation of the CC either ruling out this idea or confirming the evolution
hereafter expected.


title:
Signatures of supernova neutrino oscillations in the Earth mantle and
  core

abstract:
  The Earth matter effects on supernova (SN) neutrinos can be identified at a
single detector through peaks in the Fourier transform of their ``inverse
energy'' spectrum. The positions of these peaks are independent of the SN
models and therefore the peaks can be used as a robust signature of the Earth
matter effects, which in turn can distinguish between different neutrino mixing
scenarios. Whereas only one genuine peak is observable when the neutrinos
traverse only the Earth mantle, traversing also the core gives rise to multiple
peaks. We calculate the strengths and positions of these peaks analytically and
explore their features at a large scintillation detector as well as at a
megaton water Cherenkov detector through Monte Carlo simulations. We propose a
simple algorithm to identify the peaks in the actual data and quantify the
chances of a peak identification as a function of the location of the SN in the
sky.


title: Two-hadron semi-inclusive production including subleading twist

abstract:
  We extend the analysis of two-hadron fragmentation functions to the
subleading twist, discussing also the issue of color gauge invariance. Our
results can be used anywhere two unpolarized hadrons are semi-inclusively
produced in the same fragmentation region, also at moderate values of the hard
scale Q. Here, we consider the example of polarized deep-inelastic production
of two hadrons and we give a complete list of cross sections and spin
asymmetries up to subleading twist. Among the results, we highlight the
possibility of extracting the transversity distribution with longitudinally
polarized targets and also the twist-3 distribution e(x), which is related to
the pion-nucleon sigma term and to the strangeness content of the nucleon.


title: Fixed poles, polarized glue and nucleon spin structure

abstract:
  We review the theory and present status of the proton spin problem with
emphasis on possible gluonic and sea contributions. We discuss the possibility
of a J=1 fixed pole correction to the Ellis-Jaffe sum rule for polarized deep
inelastic scattering. Fixed poles in the real part of the forward Compton
scattering amplitude have the potential to induce subtraction constant
corrections to sum rules for photon nucleon scattering.


title:
Unintegrated parton distributions and particle production in hadronic
  collisions

abstract:
  The inclusive distributions of gluons and pions for high-energy NN collisions
are calculated. The results for several unintegrated gluon distributions
(UGD's) from the literature are compared. We find huge differences in both
rapidity and $p_t$ of gluons and $\pi$'s in NN collisions for different models
of UGD's. The Karzeev-Levin UGD gives good description of momentum distribution
of charged hadrons at midrapidities. We find, however, that the gluonic
mechanism discussed does not describe the inclusive spectra of charged
particles in the fragmentation region. Some of the missing mechanisms are
calculated with the help of unintegrated parton distributions from the solution
of the CCFM equation.


title: There is no mass squared term in neutrino electric charge

abstract:
  We claim that the neutrino mass squared term cannot appear in the expansion
of the neutrino electric charge over the neutrino mass parameter at the
one-loop level of the standard model supplied with $\mathrm{SU}(2)$-singlet
right-handed neutrino.


title: Unitarity of Little Higgs Models Signals New Physics of UV Completion

abstract:
  The ``Little Higgs'' opens up a new avenue for natural electroweak symmetry
breaking in which the standard model Higgs particle is realized as a
pseudo-Goldstone boson and thus is generically light. The symmetry breaking
structure of the Little Higgs models predicts a large multiplet of
(pseudo-)Goldstone bosons and their low energy interactions below the
ultraviolet (UV) completion scale $\Lambda \sim 4\pi f \sim O(10)$ TeV, where
$f$ is the Goldstone decay constant. We study unitarity of the Little Higgs
models by systematically analyzing the high energy scatterings of these
(pseudo-)Goldstone bosons. We reveal that the collective effect of the
Goldstone scatterings via coupled channel analysis tends to push the unitarity
violation scale $\Lambda_U$ significantly below the conventional UV scale
$\Lambda \sim 4\pi f$ as estimated by naive dimensional analysis (NDA).
Specifically, $\Lambda_U \sim (3-4)f$, lying in the multi-TeV range for $f\sim
1$ TeV. We interpret this as an encouraging sign that the upcoming LHC may
explore aspects of Little Higgs UV completions, and we discuss some potential
signatures. The meanings of the two estimated UV scales $\Lambda_U$ (from
unitarity violation) and $\Lambda$ (from NDA) together with their implications
for an effective field theory analysis of the Little Higgs models are also
discussed.


title:
Broken symmetries and dilepton production from gluon fusion in a quark
  gluon plasma

abstract:
  The observational consequences of certain broken symmetries in a thermalised
quark gluon plasma are elucidated. The signature under study is the spectrum of
dileptons radiating from the plasma, through gluon fusion. Being a pure medium
effect, this channel is non-vanishing only in plasmas with explicitly broken
charge conjugation invariance. The emission rates are also sensitive to
rotational invariance through the constraints imposed by Yang's theorem. This
theorem is interpreted in the medium via the destructive interference between
various multiple scattering diagrams obtained in the spectator picture. Rates
from the fusion process are presented in comparison with those from the Born
term.


title: All-charm tetraquarks

abstract:
  We investigate four-body states with only charm quarks. Working in a large
but finite oscillator basis, we present a net binding analysis to determine if
the resulting states are stable against breakup into a pair of c-cbar mesons.
We find several close-lying bound states in the two models we examine.


title:
Determination of the longitudinal proton structure function FL at low Q2
  at HERA

abstract:
  An extraction of the longitudinal proton structure function FL(x,Q2) from H1
data at low Q2 (about 1 GeV2) and low Bjorken x (about 0.00005) is reported.
The analysis is based on the data collected in a dedicated low Q2 running
period in 1999 and during shifted vertex runs in 2000. Two methods of
extracting FL(x,Q2) are discussed and shown to give consistent results.
Theoretical predictions are compared with the data.


title: Search for teta 1 3 mixing parameter with the low power reactor

abstract:
  One of the main problems of neutrino physics is the measurement of mixing
parameter sin2(2 teta 1 3). At present time several projects of reactor
experiments with sensitivity of sin2(2 teta 1 3) ~ 0.01 are under discussion.
Practically, all of them are based on the principle 'one reactor- two
detectors'. Such approach suppose to use NPP reactor with power of several GW
as the source of neutrino and two detectors of similar configuration placed at
different distance from the reactor. The sistematic error in such experiments
may reach ~ 1% and the accuracy ~ 0.01 as the result. In this paper we propose
to use for the measurement of sin2(2 teta 1 3) the existing SuperKamiokande
(SK) set-up in combination with 'own' antineutrino source - nuclear reactor of
small thermal power ~ 300MW (LPR). Such experiment could be carried out in
relatively short time. As it was shown by the study of different detection
mechanisms, the combination LPR-SK allows to obtain the sensitivity of sin2(2
teta 1 3) ~ 0.002.


title: Introduction to Low x Physics and Saturation

abstract:
  The idea of saturation of parton densities in small x physics is briefly
introduced. Some aspects of saturation are described, mainly focusing on the
status of our knowledge on the non-linear equations describing the high parton
density regime. Implications of saturation ideas on the description of nuclear
collisions at the Relativistic Heavy Ion Collider are discussed.


title: GUT Precursors in $SU(3)^3$-Type Model and $N_{COLOUR}>3$

abstract:
  We investigate the $SU(3)^3$ GUT model when signs of the model (precursors),
due to low compactification scale, appear before the gauge couplings of the
Standard Model get unified. The Kaluza-Klein state contribution seems to lead
the gauge couplings to unification through a wide energy scale only in the case
when the colour group is augmented to SU(4).


title: NNLO parton distributions from deep-inelastic-scattering data

abstract:
  The parton distributions functions (PDFs) derived from the NNLO QCD analysis
of existing light-targets deep-inelastic-scattering data are presented. The NLO
and NNLO PDFs are compared in order to analyze perturbative stability of the
analysis and estimate impact of the higher-order QCD corrections. The main
theoretical uncertainties and experimental uncertainties in PDFs due to all
sources of experimental errors in data are estimated and used to assess
corresponding uncertainties in the cross sections of other hadronic processes.


title:
CP property of the Higgs at the gamma gamma colliders using $t \bar t$
  production

abstract:
  We present results of an investigation to study CP violation in the Higgs
sector in $t\bar t$ production at a $\gamma\gamma$-collider, via the process $
\gamgam \ra \phi \ra t \bar t$ where the $\phi$ is a scalar with indeterminate
CP parity. The study is performed in a model independent way parametrising the
CP violating couplings in terms of six form factors $\{\Re(S_{\gamma}),
\Im(S_{\gamma}), \Re(P_{\gamma}), \Im(P_{\gamma}), S_t, P_t\}$. The CP
violation is reflected in the polarisation asymmetry of the produced top quark.
We use the angular distribution of the decay lepton from $t/\bar t$ as a
diagnostic of this polarisation asymmetry and hence of the CP mixing, after
showing that the asymmetries in the angular distribution are indpendent of any
CP violation in the $tbW$ vertex. We construct combined asymmetries in the
initial state lepton (photon) polarization and the final state lepton charge
and study how well different combinations of these form factors can be probed
by measurements of these asymmetries, using circularly polarized photons. We
demonstrate the feasibility of the method to probe CP violation in the Higgs
sector at the level induced by loop effects in supersymmetric theories, using
realistic photon spectra expected for a TESLA like $e^+ e^-$ collider. We
investigate the sensitivity of our method for for different widths of the
scalar as well as for the more realistic backscattered laser photon spectrum
resulting from the inlcusion of the nonlinear effects.


title:
Two-Loop Vertices in Quantum Field Theory: Infrared Convergent Scalar
  Configurations

abstract:
  A comprehensive study is performed of general massive, scalar, two-loop
Feynman diagrams with three external legs. Algorithms for their numerical
evaluation are introduced and discussed, numerical results are shown for all
different topologies, and comparisons with analytical results, whenever
available, are performed. An internal cross-check, based on alternative
procedures, is also applied. The analysis of infrared divergent configurations,
as well as the treatment of tensor integrals, will be discussed in two
forthcoming papers.


title:
Complete bremsstrahlung corrections to the forward-backward asymmetries
  in $b\to X_s\ell^+\ell^-$

abstract:
  In a recent paper we presented a calculation of NNLL virtual corrections to
the forward-backward asymmetries in $b\to X_s\ell^+\ell^-$ decay. That result
does not include bremsstrahlung corrections which are free from infrared and
collinear singularities. In the present paper we include the remaining ${\cal
O}(\alpha_s)$ bremsstrahlung corrections to the forward-backward asymmetries in
$b\to X_s\ell^+\ell^-$ decay. The numerical effect of the calculated
contributions is found to be below 1%.


title: Photon 2003: a theorist's summary and outlook

abstract:
  In this talk I present a summary of some of the discussions at the conference
on various topics in Photon physics, selected with a view to give a theorist's
perspective, of the current status and future prospects, of the developments in
the field. After discussing some of the recent theoretical developments in the
subject of Photon Structure function, I will focus on what the photon has
helped us learn about the spin structure of a proton, aspects of perturbative
and nonperturbative QCD as well as forward and diffractive physics. I will
discuss the challenges that the data on heavy flavour production in the two
photon reactions and in photo production, seem to have presented to the
theorists. Then I discuss the direction in which photon physics is likely to go
in future and what we {\em need} the photons to still tell us. I will end by
talking about the newer developments in prospects for photon studies at future
colliders and opportunities that these will provide us to learn about the
physics beyond the Standard Model.


title: Narrowing the window for millicharged particles by CMB anisotropy

abstract:
  We calculate the cosmic microwave background (CMB) anisotropy spectrum in
models with millicharged particles of electric charge q\sim 10^{-6}-10^{-1} in
units of electron charge. We find that a large region of the parameter space
for the millicharged particles exists where their effect on the CMB spectrum is
similar to the effect of baryons. Using WMAP data on the CMB anisotropy and
assuming Big Bang nucleosynthesis value for the baryon abundance we find that
only a small fraction of cold dark matter, Omega_{mcp}h_0^2 < 0.007 (at 95%
CL), may consists of millicharged particles with the parameters (charge and
mass) from this region. This bound significantly narrows the allowed range of
the parameters of millicharged particles. In models without paraphoton
millicharged particles are now excluded as a dark matter candidate. We also
speculate that recent observation of 511 keV gamma-rays from the Galactic bulge
may be an indication that a (small) fraction of CDM is comprised of the
millicharged particles.


title:
Renormalization Group and Decoupling in Curved Space: III. The Case of
  Spontaneous Symmetry Breaking

abstract:
  We continue investigation of the renormalization group and decoupling of the
quantized massive fields in curved space. In the present work we analyze a
theory, where fields gain their masses due to the Spontaneous Symmetry Breaking
(SSB), that is the case providing a remarkable exception from the
Appelquist-Carazzone theorem in the matter fields sector. In the vacuum sector,
already at the classical level, the theory with SSB includes, in the general
case an infinite number of the non-local terms in the induced vacuum action.
Despite this surprising property, we show that the theory is renormalizable and
moreover the low-energy decoupling in the higher-derivative gravitational
sector performs similar to the AC theorem.


title:
Relating the proton, neutron and deuteron structure functions in the
  covariant Bethe-Salpeter formalism

abstract:
  The neutron structure function F2n(x) is evaluated within the kinematic range
10**(-3)<x<1 from the deuteron and proton data by employing relativistic
theoretical description of F2D(x) and several assumptions on the hihg-x
asymptotics of F2n(x)/F2p(x). It is shown that new measurements of F2D(x) in
the range 0.6<x<0.8 would substantially improve understanding of the relation
between d and u valence quarks in the limit x -> 1.


title: Diffractive Physics Results at CDF

abstract:
  Forward detectors are described together with the first physics results from
Run II. Using new data and dedicated diffractive triggers, a measurement of
single diffractive dijet production rate, with particular focus on the
diffractive structure function of the antiproton, is discussed. Upper limits on
the exclusive dijet and $\chi^0_c$ production cross sections are also
presented.


title: Resummed Transverse Momentum Distribution in b->s+gamma

abstract:
  We present the complete calculation of the transverse momentum distribution
for the decay b-> s gamma. The contributions of the leading operator O_7 are
computed: infrared logarithms are resummed with next-to-leading accuracy
according to usual techniques of resummation. Non logarithmic terms are
evaluated to O(alpha_S) by calculating one loop diagrams.


title: Q_T resummation in Higgs boson production at the LHC

abstract:
  When considering the transverse momentum distribution (q_T) of the Higgs
boson production it is necessary to separate the small q_T region (q_T << M_H)
from the medium and large (q_T > M_H) one, the former being treated by means of
resummation techniques of logaritmhically-enhanced contributions and the latter
by fixed-order perturbation theory. Then these two approaches have to be
consistently matched to avoid double-counting in the intermediate q_T region.
Here soft gluon resummation is implemented up to NNLL order and the matching to
the corresponding NLO perturbative result is performed. Numerical results are
shown for the LHC. The main features of the differential distribution turn out
to be quite stable with respect to perturbative uncertainties.


title: On the nature of $f_0$ mesons below 1.9 GeV and lower scalar nonets

abstract:
  The combined 3-channel analysis of experimental data on the coupled processes
$\pi\pi\to\pi\pi,K\bar{K},\eta\eta$ is carried out in the channel with the
vacuum quantum numbers. An approach, using only first principles (analyticity
and unitarity) and the uniformizing variable, is applied. Definite indications
of the QCD nature of the $f_0$ resonances below 1.9 GeV are obtained, among
them a surprising indication for $f_0(980)$ to be the $\eta\eta$ bound state.
An assignment of the scalar mesons below 1.9 GeV to lower nonets is proposed.


title: On the connection between classical and quantum descriptions

abstract:
  The paper develops the idea that the dynamics of both classical and quantum
processes is time reversible. It is shown how this classical analogy allows one
to define the measure for the path integral in quantum mechanics.


title:
Generalized Parton Distributions and the structure of the constituent
  quark

abstract:
  In a scenario where the constituent quarks are composite systems, Generalized
Parton Distributions (GPDs) are built from wave functions to be evaluated in a
Constituent Quark Model (CQM), convoluted with the GPDs of the constituent
quarks themselves. The approach permits to access the kinematical range
corresponding to the DGLAP and ERBL regions, so that cross sections for deeply
virtual Compton scattering could be estimated.


title:
Phenomenology of a Quark Mass Matrix from Six Dimensions and its
  implication for the Strong CP problem

abstract:
  A model of quark mass matrices from six dimensions, which is nearly democatic
in nature and which is previously constructed by two of us (PQH and MS), is
studied in detail in this manuscript. We found that not only it fits all the
six quark masses as well as the CKM matrix but also that there exists a region
in the allowed parameter space of the model where the constraint on the
parameter \bar{\theta} of the Strong CP problem is satisfied. This region
itself puts a constraint on the CKM parameters \bar{\rho} and \bar{\eta}. As
such, through our analysis, there appears to be a deep connection between
Strong and Weak CP in this model


title:
Scalar and Pseudoscalar Higgs Boson Plus One Jet Production at the LHC
  and Tevatron

abstract:
  The production of the Standard Model (SM) Higgs boson (H) in association with
a jet is compared with that of the lightest scalar Higgs boson (h^0) and the
pseudoscalar Higgs boson (A^0) of the Minimal Supersymmetric Model (MSSM) at
both the CERN Large Hadron Collider (LHC) and the Fermilab Tevatron. We include
both top and bottom quark loops to lowest order in QCD and investigate the
limits of zero quark mass and infinite quark mass.


title:
Perturbative QCD at non-zero chemical potential: Comparison with the
  large-Nf limit and apparent convergence

abstract:
  The perturbative three-loop result for the thermodynamic potential of QCD at
finite temperature and chemical potential as obtained in the framework of
dimensional reduction is compared with the exact result in the limit of large
flavor number. The apparent convergence of the former as well as possibilities
for optimization are investigated. Corresponding optimized results for full QCD
are given for the case of two massless quark flavors.


title: Constraints on lepton flavor violation in the two Higgs doublet model

abstract:
  Constraints on the whole spectrum of lepton flavor violating vertices are
shown in the context of the standard two Higgs doublet model. The vertex
involving the $e-\tau$ mixing is much more constrained than the others, and the
decays proportional to such vertex are usually very suppressed.


title:
Calculations of binding energies and masses of heavy quarkonia using
  renormalon cancellation

abstract:
  We use various methods of Borel integration to calculate the binding ground
energies and masses of b-bbar and t-tbar quarkonia. The methods take into
account the leading infrared renormalon structure of the hard+soft part of the
binding energies E(s), and of the corresponding quark pole masses m_q, where
the contributions of these singularities in M(s) = 2 m_q + E(s) cancel.
Beforehand, we carry out the separation of the binding energy into its
hard+soft and ultrasoft parts. The resummation formalisms are applied to
expansions of m_q and E(s) in terms of quantities which do not involve
renormalon ambiguity, such as MSbar quark mass, and alpha_s. The
renormalization scales are different in calculations of m_q, E(s) and E(us).
The MSbar mass of b quark is extracted, and the binding energies of t-tbar and
the peak (resonance) energies for (t+tbar) production are obtained.


title: Is the quark- mixing matrix moduli symmetric?

abstract:
  If the unitary quark- mixing matrix, $V$, is moduli symmetric then it depends
on three real parameters. This means that there is a relation between the four
parameters needed to parametrize a general $V$. It is shown that there exists a
very simple relation involving $|V_{11}|^2, |V_{33}|^2,\orh $ and $\oet$. This
relation is compared with the present experimental data. It is concluded that a
moduli symmetric $V$ is not ruled out.


title: The photon spectrum in orthopositronium decay at \omega_\gamma << m_e

abstract:
  A closed analytic expression is given for the spectrum of low energy photons
in the annihilation of orthopositronium, which expression sums all the effects
of the Coulomb interaction between the electron and the positron. The
applicability of the formula is limited only by the condition $\omega_\gamma
\ll m_e$. In the region $\omega_\gamma \gg m_e \alpha^2$ the Coulomb
interaction term gives the leading at low energy one-loop correction,
proportional to $\alpha \sqrt{m_e/\omega_\gamma}$, to the decay spectrum. The
constant in $\omega_\gamma$ radiative term in the one-loop correction to the
spectrum is also presented here in an analytic form.


title: Charmed meson resonances from chiral coupled-channel dynamics

abstract:
  Charmed meson resonances with quantum numbers J^P=0^+ and J^P=1^+ are
generated in terms of chiral coupled-channel dynamics. At leading order in the
chiral expansion a parameter-free prediction is obtained for the scattering of
Goldstone bosons off charmed pseudo-scalar and vector mesons. The recently
announced narrow open charm states observed by the BABAR and CLEO
collaborations are reproduced. We suggest the existence of states that form an
anti-triplet and a sextet representation of the SU(3) group. In particular, so
far unobserved narrow isospin-singlet states with negative strangeness are
predicted.


title: Radiative CP Phases in Supergravity Theories

abstract:
  In this letter, we point out that possible sources of CP violation originate
from radiative corrections to soft terms which are ubiquitous in supergravity
theories and also in other high-energy frameworks of supersymmetry breaking.
With these radiative phases of gaugino masses and scalar couplings, a complex
phase of Higgs holomorphic mass parameter is generated via
renormalization-group running down to low energy. It is found that its phase
value is mainly controlled by wino as well as gluino, which generally receive
different radiative corrections to their complex phases, even if the leading
part of mass parameters follow from the universality hypothesis. The
radiatively generated phases are constrained by the existing experimental
bounds on electric dipole moments, and may be detectable in future
measurements. They are also found to be available for the cancellation
mechanism to be worked.


title: History of exotic Meson (4-quark) and Baryon (5-quark) States

abstract:
  I briefly review the history of exotic meson (4-quark) and baryon (5-quark)
states, which is rooted in the formalism of Regge pole and duality. There are
robust model-independent predictions for the exchange of 4-quark (Baryonium)
Regge trajectories in several processes, which are strongly supported by
experiment. On the other hand the predictions for the spectroscopy of 4-quark
resonances are based on specific QCD inspired models, with some experimental
support. The corresponding predictions for the recently discovered exotic
baryon (Pentaquark) state are briefly discussed.


title: Herwig++ 1.0: An Event Generator for e+e- Annihilation

abstract:
  Results from the new Monte Carlo event generator Herwig++ are presented. This
first version simulates Hadron Emission Reactions With Interfering Gluons in
electron-positron annihilation. The parton shower evolution is carried out
using new evolution variables suited to describing radiation from heavy quarks
as well as light partons. The partonic final state is fragmented into hadrons
by means of an improved cluster hadronization model. The results are compared
with a wide variety of data from LEP and SLC.


title: What we have learned from direct CP violation studies in kaon decays

abstract:
  A self-consistent analysis of K --> 2pi and K --> 3pi decays within a unique
framework of chiral dynamics applied to the QCD-corrected weak nonleptonic
quark lagrangian has been performed. The results on K --> 2pi amplitudes at
O(p^6), including the value for epsilon'/epsilon, are compared with experiment
to fix phenomenological B-factors for mesonic matrix elements of nonpenguin and
penguin four-quark operators. The dependence of these B-factors on different
theoretical uncertainties and experimental errors of various input parameters
is investigated. Finally, we present our estimates at O(p^6) for the CP
asymmetry of linear slope parameters in the K+- --> 3pi Dalitz plot.


title: Rapidity gap physics at contemporary colliders

abstract:
  This thesis is concerned with the theory and the phenomenology of rapidity
gap processes. We perform perturbative calculations of energy flow observables
in jet-gap-jet processes, which consist of resummed primary emission
calculations specific to the soft gluon geometry at HERA and an estimate of
non-global (secondary emission) effects in clustered energy flow observables.
The resulting predictions agree well with H1 data. We also study hard
diffraction and use a factorised model, with a Monte Carlo event generator, to
make detailed predictions for gap-jet-gap events at the Tevatron. We find that
we can describe the data in a natural way by using HERA parton densities and a
gap surivial factor consistent with theoretical estimates.


title: Photon Total Cross-sections

abstract:
  We discuss present predictions for the total $\gamma \gamma$ and $\gamma p $
cross-sections, highlighting why predictions differ. We present results from
the Eikonal Minijet Model and improved predictions based on soft gluon
resummation.


title: Chiral Dynamics: Theory and Experiment (CD2003)

abstract:
  These are the proceedings of the fourth international workshop on "Chiral
Dynamics: Theory and Experiment" which was held at the University of Bonn,
September 8-13, 2003. The workshop concentrated on the various experimental
andtheoretical aspects of chiral dynamics, including for the first time in this
series detailed discussions of lattice gauge theory. It consisted of an
introductory lecture, plenary talks, working group talks and working group
summaries. Included is a short contribution per talk.


title:
Masses and couplings of vector mesons from the pion electromagnetic,
  weak, and \pi\gamma transition form factors

abstract:
  We analyse the pion electromagnetic, charged-current, and $\pi\gamma$
transition form factors at timelike momentum transfers $q$, $q^2=s\le 1.4$
GeV$^2$, using a dispersion approach. We discuss in detail the propagator
matrix of the photon-vector-meson system and define certain reduced amplitudes,
or vertex functions, describing the coupling of this system to final states. We
then apply the derived analytic expressions to the analysis of the recent
$e^+e^-\to \pi^+\pi^-$, $\tau^-\to \pi^-\pi^0\nu_\tau$, and $e^+e^-\to
\pi^0\gamma$ data. We find the reduced amplitudes for the coupling of the
photon and vector mesons to two pseudoscalars to be constant, independent of
$s$, in the range considered, indicating a "freezing" of the amplitudes for
$s\le 1$ GeV. The fit to the form factor data leads to the following values of
the Breit-Wigner resonance masses m_{\rho^-}=775.3\pm 0.8 MeV,
m_{\rho^0}=773.7\pm 0.6 MeV and m_\omega=782.43\pm 0.05 MeV, where the errors
are only statistical.


title: Supersymmetric grandunification and fermion masses

abstract:
  A short review of the status of supersymmetric grand unified theories and
their relation to the issue of fermion masses and mixings is given.


title: The Neutrino Mass Matrix - From A_4 to Z_3

abstract:
  With the recent experimental advance in our precise knowledge of the neutrino
oscillation parameters, the correct form of the 3 X 3 neutrino mass matrix is
now approximately known. I discuss how this may be obtained from symmetry
principles, using as examples the finite groups A_4 and Z_3, in two complete
theories of leptons (and quarks).


title:
Theoretical progress for the associated production of a Higgs boson with
  heavy quarks at hadron colliders

abstract:
  The production of a Higgs boson in association with a pair of top-antitop or
bottom-antibottom quarks plays a very important role at both the Tevatron and
the Large Hadron Collider. The theoretical prediction of the corresponding
cross sections has been improved by including the complete next-to-leading
order QCD corrections. After a brief introduction, we review the results
obtained for both the Tevatron and the Large Hadron Collider.


title: Status of neutrino oscillations II: How to reconcile the LSND result?

abstract:
  We present an analysis of the global neutrino oscillation data including the
LSND result in terms of four-neutrino mass schemes and a CPT violating
three-neutrino framework. We find that the strong preference of oscillations
into active neutrinos implied by recent solar+KamLAND as well as atmospheric
neutrino data allows to rule out (2+2) mass schemes at 5.8$\sigma$, whereas
(3+1) schemes are disfavoured at the 3.2$\sigma$ level by short-baseline
experiments. The CPT violating scenario is disfavoured at 3.4$\sigma$ by
KamLAND and atmospheric anti-neutrino data. We conclude that currently no
convincing explanation for the LSND signal exists, and it remains a puzzle how
to reconcile it with the other evidences for neutrino oscillations.


title:
The covariant structure of light-front wave functions and the behavior
  of hadronic form factors

abstract:
  We study the analytic structure of light-front wave functions (LFWFs) and its
consequences for hadron form factors using an explicitly Lorentz-invariant
formulation of the front form. The normal to the light front is specified by a
general null vector $\omega^\mu.$ The LFWFs with definite total angular
momentum are eigenstates of a {\it kinematic} angular momentum operator and
satisfy all Lorentz symmetries. They are analytic functions of the invariant
mass squared of the constituents $M^2_0= (\sum k^\mu)^2$ and the light-cone
momentum fractions $x_i= {k_i\cd \omega / p \cd \omega}$ multiplied by
invariants constructed from the spin matrices, polarization vectors, and
$\omega^\mu.$ These properties are illustrated using known nonperturbative
eigensolutions of the Wick--Cutkosky model. We analyze the LFWFs introduced by
Chung and Coester to describe static and low momentum properties of the
nucleons. They correspond to the spin-locking of a quark with the spin of its
parent nucleon, together with a positive-energy projection constraint. These
extra constraints lead to anomalous dependence of form factors on $Q$ rather
than $Q^2.$ In contrast, the dependence of LFWFs on $M^2_0$ implies that hadron
form factors are analytic functions of $Q^2$ in agreement with dispersion
theory and perturbative QCD. We show that a model incorporating the
leading-twist perturbative QCD prediction is consistent with recent data for
the ratio of proton Pauli and Dirac form factors.


title:
Precision Electroweak Data and the Mixed Radion-Higgs Sector of Warped
  Extra Dimensions

abstract:
  We derive the Lagrangian and Feynman rules up to bilinear scalar fields for
the mixed Higgs-radion eigenstates interacting with Standard Model particles
confined to a 3-brane in Randall-Sundrum warped geometry. We use the results to
compute precision electroweak observables and compare theory predictions with
experiment. We characterize the interesting regions of parameter space that
simultaneously enable a very heavy Higgs mass and a very heavy radion mass,
both masses being well above the putative Higgs boson mass limit in the
Standard Model derived from the constraints of precision electroweak
observables. For parameters consistent with the precision constraints the Higgs
boson physical eigenstate is typically detectable, but its properties may be
difficult to study at the Large Hadron Collider. In contrast, masses and
couplings are allowed for the physical radion eigenstate that make it
unobservable at the LHC. A Linear Collider will significantly improve our
ability to study the Higgs eigenstate, and will typically allow detection of
the radion eigenstate if it is within the machine's kinematical reach.


title: Nuclear Hadronization: Within or Without?

abstract:
  Nuclei are unique analyzers for the early stage of the space-time development
of hadronization. DIS at medium energies is especially suitable for this task
being sensitive to hadronization dynamics, since the production length is
comparable with the nuclear size. This was the driving motivation to propose
measurements at HERMES using nuclear targets, and to provide predictions based
on a pQCD model of hadronization [1]. Now when the first results of the
experiment are released [2,3], one can compare the predictions with the data.
The model successfully describes with no adjustment the nuclear effects for
various energies, zh, pT, and Q2, for different flavors and different nuclei.
It turns out that the main source of nuclear suppression of the hadron
production rate is attenuation of colorless pre-hadrons in the medium. An
alternative model [4] is based upon an ad hoc assumption that the colorless
pre-hadron is produced outside the nucleus. This model has apparent problems
attempting to explain certain features of the results from HERMES. A good
understanding of the hadronization dynamics is important for proper
interpretation of the strong suppression of high-pT hadrons observed in heavy
ion collisions at RHIC. We demonstrate that the production length is even
shorter in this case and keeps contracting with rising pT.


title:
Chiral-Odd Fragmentation Functions in Single Pion Inclusive
  Electroproduction

abstract:
  We consider a sub-leading twist chiral-odd pion fragmentation function and
explore its contribution in single pion semi-inclusive electroproduction. We
evaluate the single beam-spin azimuthal asymmetry $A_{LU}$ and the double spin
asymmetry $A_{LT}$ in polarized electroproduction of pions from an unpolarized
and transversely polarized nucleon respectively. The beam asymmetry is
expressed as the product of chiral-odd, and $T$-odd and even distribution and
fragmentation functions. The double spin asymmetry contains information on the
quark's transversity distribution. In a quark diquark-spectator framework we
estimate these asymmetries at $6 {\rm GeV}$, $ 12 {\rm GeV}$, and $27.5 {\rm
GeV}$ energies.


title:
Complete description of polarization effects in the nonlinear Compton
  scattering. II. Linearly polarized laser photons

abstract:
  We consider emission of a photon by an electron in the field of a strong
laser wave. Polarization effects in this process are important for a number of
physical problems. We discuss a probability of this process for linearly
polarized laser photons and for arbitrary polarization of all other particles.
We obtain the complete set of functions which describe such a probability in a
compact form.


title: LHC physics: challenges for QCD

abstract:
  I review the status of the comparisons between a few measurements at hadronic
colliders and perturbative QCD predictions, which emphasize the need for
improving the current computations. Such improvements will be mandatory for a
satisfactory understanding of high-energy collisions at the LHC


title: MSSM Higgses as the source of reheating and all matter

abstract:
  We consider the possibility that the dark energy responsible for inflation is
deposited into extra dimensions outside of our observable universe. Reheating
and all matter can then be obtained from the MSSM flat direction condensate
involving the Higgses $H_u$ and $H_d$, which acquires large amplitude by virtue
of quantum fluctuations during inflation. The reheat temperature is $T_{RH}
\lesssim 10^9$ GeV so that there is no gravitino problem. We find a spectral
index $n_s\approx 1$ with a very weak dependence on the Higgs potential.


title: Charm and beauty production at LHC

abstract:
  This note will be part of Chapter 6.5 of the ALICE Physics Performance Report
(PPR), "ALICE Physics: Charm and Beauty", where the capabilities of ALICE for
the detection of open heavy flavour particles will be described.
  We define here the present ALICE baseline for what concerns the heavy flavour
production cross sections at LHC and the kinematical distributions of the heavy
quark pairs. We start by qualitatively assessing the Bjorken x regimes
accessible with charm and beauty measurements at LHC with ALICE (Section 1). In
Section 2 we report the most recent results (and the uncertainties) of the
next-to-leading order (NLO) pQCD calculations for the cross sections in pp
collisions at LHC energies. These results are extrapolated to Pb-Pb collisions
in Section 3.1 and to p-Pb collisions in Section 3.2, taking into account
nuclear shadowing and parton intrinsic transverse momentum broadening.Heavy
quark kinematics as given by the NLO pQCD calculation are reported in Section
4. We tuned the PYTHIA event generator in order to reproduce such results for
what concerns the c and b quarks transverse momentum distributions (Section 5).
Finally, we report the yields and transverse momentum distributions for D and B
mesons (Section 6).


title: Neutrino Data, CP violation and Cosmological Implications

abstract:
  Recent experimental data provides evidence for neutrino masses and leads to
the possibility of leptonic mixing and CP violation. In this work special
attention is dedicated to CP violation in the leptonic sector both at low and
at high energies in the framework of seesaw with only three righthanded
neutrinos added to the Lagrangean of the Standard Model. It is shown that
leptogenesis is a possible and likely explanation for the observed baryon
asymmetry of the universe. In this case neutrino masses are constrained yet CP
violating phases at low energies can only be related to CP violation at high
energies in the context of specific models.


title: Nuclear parton distributions at next to leading order

abstract:
  We perform a next to leading order QCD global analysis of nuclear deep
inelastic scattering and Drell-Yan data using the convolution approach to
parameterize nuclear parton densities. We find both a significant improvement
in the agreement with data compared to previous extractions, and substantial
differences in the scale dependence of nuclear effects compared to leading
order analyses.


title: D-Matter

abstract:
  We study the properties and phenomenology of particle-like states originating
from D-branes whose spatial dimensions are all compactified. They are
non-perturbative states in string theory and we refer to them as D-matter. In
contrast to other non-perturbative objects such as 't Hooft-Polyakov monopoles,
D-matter states could have perturbative couplings among themselves and with
ordinary matter. The lightest D-particle (LDP) could be stable because it is
the lightest state carrying certain (integer or discrete) quantum numbers.
Depending on the string scale, they could be cold dark matter candidates with
properties similar to that of wimps or wimpzillas. The spectrum of excited
states of D-matter exhibits an interesting pattern which could be distinguished
from that of Kaluza-Klein modes, winding states, and string resonances. We
speculate about possible signatures of D-matter from ultra-high energy cosmic
rays and colliders.


title: Short Range Structure in the X(3872)

abstract:
  It is proposed that the newly discovered X(3872) is a $J^{PC} = 1^{++}$
$D^0\bar D^{0*}$ hadronic resonance stabilized by admixtures of $\omega J/\psi$
and $\rho J/\psi$. A specific model of the state is constructed and tests of
its internal structure are suggested via the predicted decay modes $D^0\bar
D^0\pi^0$, $D^0\bar D^0\gamma$, $\pi^+\pi^- J/\psi$, and $\pi^+\pi^-\pi^0
J/\psi$.


title:
The width of $\Theta^{+}$ for large $N_{c}$ in chiral quark soliton
  model

abstract:
  In the chiral quark soliton model the smallness of $\Theta^+$ width is due to
the cancellation of the coupling constants which are of different order in
$N_c$. We show that taking properly into account the flavor structure of
relevant SU(3) representations for arbitrary number of colors enahnces the
nonleading term by an additional factor of $N_c$, making the cancellation
consistent with the $N_c$ counting. Moreover, we show that, for the same
reason, $\Theta^+$ width is suppressed by a group-theoretical factor ${\cal
O}(1/N_c)$ with respect to $\Delta$ and discuss the $N_c$ dependence of the
phase space factors for these two decays.


title: Dijet production as a centrality trigger for p-p collisions at CERN LHC

abstract:
  We demonstrate that a trigger on hard dijet production at small rapidities
allows to establish a quantitative distinction between central and peripheral
collisions in pbar-p and p-p collisions at Tevatron and LHC energies. Such a
trigger strongly reduces the effective impact parameters as compared to minimum
bias events. This happens because the transverse spatial distribution of hard
partons (x >~ 10^{-2}) in the proton is considerably narrower than that of soft
partons, whose collisions dominate the total cross section. In the central
collisions selected by the trigger, most of the partons with x >~ 10^{-2}
interact with a gluon field whose strength rapidly increases with energy. At
LHC (and to some extent already at Tevatron) energies the strength of this
interaction approaches the unitarity ('black-body') limit. This leads to
specific modifications of the final state, such as a higher probability of
multijet events at small rapidities, a strong increase of the transverse
momenta and depletion of the longitudinal momenta at large rapidities, and the
appearance of long-range correlations in rapidity between the forward/backward
fragmentation regions. The same pattern is expected for events with production
of new heavy particles (Higgs, SUSY). Studies of these phenomena would be
feasible with the CMS-TOTEM detector setup, and would have considerable impact
on the exploration of the physics of strong gluon fields in QCD, as well as the
search for new particles at LHC.


title: Quantitative duality and quantum erasure for neutral kaons

abstract:
  The aim of this contribution is to illustrate two basic aspects of quantum
mechanics applied to the neutral kaon system. We first describe a recent
quantitative formulation of Bohr's complementarity principle for free--space
evolution of single kaons and entangled kaon pairs. We then show that the
neutral kaon system is also suitable for an optimal demonstration of the
``quantum eraser'', including its operation in the ``delayed choice'' mode. In
our discussions, strangeness oscillations play the role of the traditional
interference pattern linked to wave--like behaviour. The role of the two
interferometric paths taken by particle--like objects is played by the
differently propagating $K_S$ and $K_L$ components. Their distinct decay widths
provide a quantum ``mark'' which can be erased by appropriate strangeness
measurements.


title: The eccentric universe

abstract:
  For a universe containing cosmological constant together with uniform
arrangements of magnetic fields, strings, or domain walls, exact solutions to
the Einstein equations are shown to lead to a universe with ellipsoidal
expansion. The magnetic field case is the easiest to motivate and has the
highest possibility of finding application in observational cosmology.


title:
Nonperturbative Corrections with Nonlocal Operators to Lifetime Ratios
  of Beauty Hadrons

abstract:
  The motion of spectator quarks in decay of a beauty hadron is a
nonperturbative effect which can usually be neglected. We find that the motion
in some decay channels, which contribute total decay widths of beauty hadrons,
can not be neglected.The contributions from these decay channels to decay
widths are proportional to certain averages of the squared inverse of the
momentum carried by a spectator quark. This fact results in that these
contributions, suppressed by $1/m_b^3$ formally, are effectively suppressed by
$1/m_b$. We find these contributions can be factorized into products of
perturbative coefficients and nonperturbative parameters. We calculate these
coefficients and define these nonperturbative parameters in terms of HQET
matrix elements.Since these parameters are unknown, we are unable to give
numerical predictions in detail. But with a simple model it can be shown that
these contributions can be large.


title: Non quark-antiquark light meson spectroscopy

abstract:
  In this talk I comment on some theoretical expectations for exotic light
meson spectroscopy below 2 GeV and their potential interest for a future energy
upgrade of DAFNE.


title:
Perturbative out of equilibrium quantum field theory beyond the gradient
  approximation and generalized Boltzmann equation

abstract:
  Using the closed-time-path formalism, we construct perturbative frameworks,
in terms of quasiparticle picture, for studying quasiuniform relativistic
quantum field systems near equilibrium and non-equilibrium quasistationary
systems. We employ the derivative expansion and take in up to the second-order
term, i.e., one-order higher than the gradient approximation. After
constructing self-energy resummed propagator, we formulated two kind of
mutually equivalent perturbative frameworks: The first one is formulated on the
basis of the ``bare'' number density function, and the second one is formulated
on the basis of ``physical'' number density function. In the course of
construction of the second framework, the generalized Boltzmann equations
directly come out, which describe the evolution of the system.


title: Preheating curvature perturbations with a coupled curvaton

abstract:
  We discuss the potentially important role played by preheating in certain
variants of the curvaton mechanism in which isocurvature perturbations of a
D-flat (and F-flat) direction become converted to curvature perturbations
during reheating. We analyse the transition from inflation to reheating in some
detail, including the dynamics of the coupled curvaton and inflation fields
during this transition. We discover that preheating could be an important
source of adiabaticity where parametric resonance of the isocurvature
components amplifies the super-horizon fluctuations by a significant amount. As
an example of these effects we develop a particle physics motivated model which
we recently introduced in which the D-flat direction is identified with the
usual Higgs field. Our new results show that it is possible to achieve the
correct curvature perturbations for initial values of the curvaton fields of
order the weak scale. In this model we show that the prediction for the
spectral index of the final curvature perturbation only depends on the mass of
the curvaton during inflation, where consistency with current observational
data requires the ratio of this mass to the Hubble constant to be < 0.3.


title: Gauss-Bonnet Black Holes at the LHC : Beyond the Dimensionality of Space

abstract:
  The Gauss - Bonnet invariant is one of the most promising candidates for a
quadratic curvature correction to the Einstein action in expansions of
supersymmetric string theory. We study the evaporation of such Schwarzschild -
Gauss - Bonnet black holes which could be formed at future colliders if the
Planck scale is of order a TeV, as predicted by some modern brane world models.
We show that, beyond the dimensionality of space, the corresponding coupling
constant could be measured by the LHC. This opens new windows for physics
investigation in spite of the possible screening of microphysics due to the
event horizon.


title: Beta decay in external field and neutrino mass

abstract:
  The results of the investigation of electromagnetic field effects on the
process of beta decay are used for analyzing experimental data on direct
neutrino mass search.


title: Inflation on Moduli Space and Cosmic Perturbations

abstract:
  We show that a moduli space of the form predicted by string theory, lifted by
supersymmetry breaking, gives rise to successful inflation for large regions of
parameter space without any modification or fine tuning. This natural
realization of inflation relies crucially on the complex nature of the moduli
fields and the multiple points of enhanced symmetry, which are generic features
of moduli space but not usually considered in inflationary model building.
  Our scenario predicts cosmic perturbations with an almost exactly flat
spectrum for a wide range of scales with running on smaller, possibly
observable, scales. The running takes the form of either an increasingly steep
drop off of the spectrum, or a rise to a bump in the spectrum before an
increasingly steep drop off.


title: Theory of Neutrino Oscillations

abstract:
  We review critically the main assumptions on which the standard theory of
neutrino oscillations is based. We show that all assumptions are realistic,
except the so-called "equal momentum assumption", which however is irrelevant.
We conclude that the standard expression for the probability of neutrino
oscillations is robust.


title:
Weak Isospin Violations in Charged and Neutral Higgs Couplings from SUSY
  Loop Corrections

abstract:
  Supersymmetric QCD and supersymmetric electroweak loop corrections to the
violations of weak isospin to Yukawa couplings are investigated. Specifically
it involves an analysis of the supersymmetric loop corrections to the Higgs
couplings to the third generation quarks and leptons. Here we analyze the SUSY
loop corrections to the charged Higgs couplings which are then compared with
the supersymmetric loop corrections to the neutral Higgs couplings previously
computed. It is found that the weak isospin violations can be quite
significant, i.e, as much as 40-50% or more of the total loop correction to the
Yukawa coupling. The effects of CP phases are also studied and it is found that
these effects can either enhance or suppress the weak isospin violations. We
also investigate the weak isospin violation effects on the branching ratio
$BR(H^-\to\bar t b)/ BR(H^-\to \bar\nu_{\tau}\tau^-)$ and show that the effects
are sensitive to CP phases. Thus an accurate measurement of this branching
ratio along with the branching ratio of the neutral Higgs boson decays can
provide a measure of weak isospin violation along with providing a clue to the
presence of supersymmetry.


title: Heavy Quarkonium

abstract:
  I review heavy quarkonium physics in view of recent experimental results. In
particular, I discuss new results on spin singlet states, photon and hadronic
transitions, D-states and discovery of yet unexplained narrow X(3872) state.


title: See-Saw Induced CMSSM Lepton-Flavour Violation Post-WMAP

abstract:
  The see-saw mechanism of neutrino mass generation, when incorporated in
supersymmetric theories with supergravity mediated supersymmetry breaking,
results in low-energy lepton-flavour violation arising from the soft
supersymmetry breaking slepton masses. The parameter space of supergravity
theories with conserved R-parity is severely constrained by the requirement
that the LSP provide cold dark matter with a relic density in the range
indicated by the recent WMAP measurements, as well as by laboratory
constraints. We calculate the $\meg$ branching ratio for the constrained
minimal supersymmetric standard model, over the range of parameters consistent
with WMAP and laboratory constraints, in families of see-saw model
parameterizations which fit the low energy neutrino measurements. We find that
over much of the range of see-saw models, for supersymmetry parameters
consistent with WMAP and laboratory bounds, the resulting predicted rates for
$\meg$ (and other charged lepton flavour violating processes) are within
current experimental limits, but that these rates should be detectable with the
next generation of lepton-flavour violation experiments.


title: Experimental Limits on the Width of the Reported Theta(1540)+

abstract:
  Using data on K^+ collisions on xenon and deuterium we derive values and
limits on the width of the reported Theta(1540)^+ exotic baryon resonance. The
xenon experiment gives a width of 0.9\pm 0.3 MeV. The other experiments give
upper limits in the range 1 - 4 MeV.


title: Chiral Symmetry and Hyperfine Quark-Antiquark Splittings

abstract:
  We briefly review theoretical calculations for the pseudoscalar-vector meson
hyperfine splitting with no open flavor and also report a many body field
theoretical effort to assess the impact of chiral symmetry in the choice of
effective potentials for relativistic quark models. Our calculations predict
the missing eta_b meson to have mass near 9400 $MeV$. The radial excitation
$\eta_c(2S)$ is in agreement with the measurements of the BELLE and most
recently BABAR collaborations.


title: Automated resummation of jet observables in QCD

abstract:
  We build a computer code that fully automates the resummation of
jet-observable distributions at next-to-leading logarithmic accuracy. As an
application we present results for a jet shape in hadronic dijet production.


title:
The Constraints on CP Violating Phases in models with a dynamical gluino
  phase

abstract:
  We have analyzed the electric dipole moment and the Higgs mass constraints on
the supersymmetric model which offers dynamical solutions to the \mu and strong
CP problems. The trilinear coupling phases, and \tan\beta-|\mu| are strongly
correlated, particularly in the low-\tan\beta regime. Certain values of the
phases of the trilinear couplings are forbidden, whereas the CP violating phase
from the chargino sector is imprisoned to lie near a CP conserving point, by
the Higgs mass and electric dipole moment constraints.


title:
kt - factorization and CCFM - the solution for describing the hadronic
  final states - everywhere ?

abstract:
  The basic ideas of kt-factorization and CCFM parton evolution is discussed.
The unintegrated gluon densities, obtained from CCFM fits to the proton
structure function data at HERA are used to predict hadronic final state cross
sections like jet production at HERA, but also comparisons with recent
measurements of heavy quark production at the Tevatron are presented. Finally,
the kt-factorization approach is applied to Higgs production at high energy
hadron hadron colliders and the transverse momentum spectrum of Higgs
production at the LHC is calculated.


title:
The Invariant Mass Spectra Profile Close to Pentaquark Mass Region at
  1.54 Gev/c^2

abstract:
  Two possible reasons for the narrow peak observation in the invariant mass
spectrum of the pK^0 close to 1.54 GeV/c^2


title: The Hadronic Cross-Section in the Resonance Energy Region

abstract:
  We study the hadronic vacuum polarization in the resonance energy region,
using the framework given by the Resonance Effective Theory of QCD. We consider
the incorporation of vector-pseudoscalar meson loops that give, inclusively,
three and four pseudoscalar meson cuts. After resummation we achieve a
QCD-based inclusive parameterization of the correlator, hence of the hadronic
cross-section in the energy region populated by resonances.


title:
Central Exclusive Scalar Luminosities from the Linked Dipole Chain Model
  gluon densities

abstract:
  We investigate the implication of uncertainties in the unintegrated gluon
distribution for the predictions for central exclusive production of scalars at
hadron colliders. We use parameterizations of the kT-unintegrated gluon density
obtained from the Linked Dipole Chain model, applying different options for the
treatment of non-leading terms. We find that the luminosity function for
central exclusive production is very sensitive to details of the transverse
momentum distribution of the gluon which, contrary to the kT-integrated
distribution, is not very well constrained experimentally.


title:
Long-distance contribution to the forward-backward asymmetry in decays
  K+ --> pi+ l+ l-

abstract:
  The long-distance contribution via the two-photon intermediate state to the
forward-backward asymmetries in decays K+ --> pi+ l+ l- (l=e and mu) has been
studied within the standard model. In order to evaluate the dispersive part of
the K+ --> pi+ gamma* gamma* --> pi+ l+ l- amplitude, we employ a
phenomenological form factor to soften the ultraviolet behavior of the
transition. It is found that, this long-distance transition, although subject
to some theoretical uncertainties, can lead to significant contributions to the
forward-backward asymmetries, which could be tested in the future high-precise
experiments.


title:
Resonant slepton production at the LHC in models with an ultralight
  gravitino

abstract:
  We examine resonant slepton production at the LHC with gravitinos in the
final state. The slepton undergoes gauge decay into a neutralino and a lepton,
the neutralino decays into a photon and a gravitino. By measuring the
transverse masses of the gamma- G and the l-gamma- G subsystems it is possible
to accurately reconstruct both the slepton and neutralino masses. In some
regions of parameter space the slepton decays directly into a lepton and
gravitino, giving an identical experimental topology to W production (l missing
E_T). We present the novel matrix element squared for lepton-gravitino
production. A peak in the tail of the lepton-missing momentum transverse mass
distribution of the W provides a signature for the process and an accurate
measurement of the slepton mass. We display the search reach for the LHC and
300 fb^{-1} of integrated luminosity.


title:
The analytic value of a 4-loop sunrise graph in a particular kinematical
  configuration

abstract:
  The 4-loop sunrise graph with two massless lines, two lines of equal mass M
and a line of mass m, for external invariant timelike and equal to m^2 is
considered. We write differential equations in x=m/M for the Master Integrals
of the problem, which we Laurent-expand in the regularizing continuous
dimension d around d=4, and then solve exactly in x up to order (d-4)^3
included; the result is expressed in terms of Harmonic PolyLogarithms of
argument x and maximum weight 7. As a by product, we obtain the x=1 value,
expected to be relevant in QED 4-loop static quantities like the electron
(g-2). The analytic results were checked by an independent precise numerical
calculation


title: Lattice measurement of the rescaling of the scalar condensate

abstract:
  We have determined the rescaling of the scalar condensate $Z\equiv Z_\phi$
near the critical line of a 4D Ising model. Our lattice data, supporting
previous numerical indications, confirm the behaviour $Z_\phi\sim \ln ({\rm
cutoff})$. This result is predicted in an alternative description of symmetry
breaking where there are no upper bounds on the Higgs boson mass from
`triviality'.


title: The Top Priority: Precision Electroweak Physics from Low to High Energy

abstract:
  Overall, the Standard Model describes electroweak precision data rather well.
There are however a few areas of tension (charged current universality, NuTeV,
(g-2)_\mu, b quark asymmetries), which I review emphasizing recent theoretical
and experimental progress. I also discuss what precision data tell us about the
Higgs boson and new physics scenarios. In this context, the role of a precise
measurement of the top mass is crucial.


title: The $J=3/2$ $\Theta^*$ partner to the $\Theta(1540)$ baryon

abstract:
  If the exotic baryon $\Theta(1540)$ is $udud\bar{s}$ with $J^P =
  {1/2}^+$, we predict that there is a \10bar with $J^P = {3/2}^+$ containing a
$\Theta^*(1540-1680)$. The width $\Gamma(\Theta^* \to KN)$ is at least a factor
of three larger than $\Gamma(\Theta)$. The possibilities of $\Theta^* \to
KN\pi$ or $\Theta \gamma$ via $M1$ and $E2$ multipoles are discussed.


title: Neutrino Physics: Open Theoretical Questions

abstract:
  We know that neutrino mass and mixing provide a window to physics beyond the
Standard Model. Now this window is open, at least partly. And the questions
are: what do we see, which kind of new physics, and how far "beyond"? I
summarize the present knowledge of neutrino mass and mixing, and then formulate
the main open questions. Following the bottom-up approach, properties of the
neutrino mass matrix are considered. Then different possible ways to uncover
the underlying physics are discussed. Some results along the line of: see-saw,
GUT and SUSY GUT are reviewed.


title: Sudakov Electroweak effects in transversely polarized beams

abstract:
  We study Standard Model electroweak radiative corrections for fully inclusive
observables with polarized fermionic beams. Our calculations are relevant in
view of the possibility for Next Generation Linear colliders of having
transversely and/or longitudinally polarized beams. The case of initial
transverse polarization is particularly interesting because of the interplay of
infrared/collinear logarithms of different origins, related both to the
nonabelian SU(2) and abelian U(1) sectors. The Standard model effects turn out
to be in the 10% range at the TeV scale, therefore particularly relevant in
order to disentangle possible New Physics effects.


title: Strong CP problem, Neutron EDM and Thermal QCD sum rules

abstract:
  The behaviour of the broken CP symmetry at finite temperature is examined.
This is achieved through the investigation of the neutron electric dipole
moment $d_n$ induced by $\theta$-term.
  By using thermal QCD sum rules, we find that below the critical temperature,
the ratio $\mid {d_n \over \bar{\theta}}\mid$ slightly decreases but survives
at temperature effects. This evolution implies that CP remains broken at finite
temperature as required by Baryogenesis \cite{Chabab}.


title: Phase Transitions in the Early Universe and Defect Formation

abstract:
  In the first one of these two lectures, I give an introductory review of
phase transitions in finite temperature field theories. I highlight the
differences between theories with global and local symmetries, and the
similarities between cosmological phase transitions and phase transitions in
superconductors. In the second one, I review the theory of defect formation in
finite temperature phase transitions, emphasising the differences between
systems with broken global and local symmetries. These same principles apply to
relativistic and condensed matter systems alike.


title: SHERPA 1.alpha, a proof-of-concept version

abstract:
  The new multipurpose event-generation framework SHERPA, acronym for
Simulation for High-Energy Reactions of PArticles, is presented. It is entirely
written in the object-oriented programming language C++. In its current form,
it is able to completely simulate electron--positron and unresolved
photon--photon collisions at high energies. Also, fully hadronic collisions,
such as, e.g., proton--anti-proton, proton--proton, or resolved photon--photon
reactions, can be described on the signal level.


title: Compact Dimensions and their Radiative Mixing

abstract:
  For one and two dimensional field theory orbifolds we compute in the DR
scheme the full dependence on the momentum scale (q) of the one-loop radiative
corrections to the 4D gauge coupling. Imposing a discrete "shift" symmetry of
summing the infinite towers of associated Kaluza-Klein (KK) modes, it is shown
that higher dimension operators are radiatively generated as one-loop
counterterms for the case of two (but not for one) compact dimension(s). They
emerge as a ``radiative mixing'' of effects (Kaluza-Klein infinite sums)
associated with both compact dimensions. Particular attention is paid to the
link of the one-loop corrections with their counterparts computed in infrared
regularised 4D N=1 heterotic string orbifolds with N=2 sectors. The correction
from these sectors usually ignores higher order terms in the IR string
regulator (lambda_s->0) of type lambda_s ln(alpha'), but these become relevant
in the field theory limit alpha'->0. Such terms ultimately re-emerge in pure
field theory calculations of $\Pi(q^2)$ as higher dimension one-loop
counterterms. We stress the importance of such terms for the unification of
gauge couplings and for the predicted value of the string scale.


title: The resummed Higgs boson transverse momentum distribution at the LHC

abstract:
  We apply QCD resummation techniques to study the transverse momentum
distribution of Higgs bosons produced via gluon-gluon fusion at the LHC. In
particular we focus on the joint resummation formalism which resums both
threshold and transverse momentum corrections simultaneously. A comparison of
results obtained in the joint and the standard recoil resummation frameworks is
presented.


title:
W hadroproduction at large transverse momentum beyond next-to-leading
  order

abstract:
  We study the production of W bosons at large transverse momentum in p pbar
collisions. We show that the next-to-leading order cross section at large
transverse momentum is dominated by threshold soft-gluon corrections. We add
next-to-next-to-leading-order soft-gluon corrections to the exact
next-to-leading-order differential cross sections. We find that these
higher-order corrections provide modest enhancements to the transverse momentum
distribution of the W at the Tevatron, and reduce significantly the dependence
on the factorization and renormalization scales.


title: On the nature of thermal QCD phase transitions

abstract:
  We argue that the chiral phase transition and the deconfinement phase
transition in finite temperature QCD are just different limits of a single
crossover phase transition driven by the lightest scalar field which is a
mixture of the glueball and the sigma meson. The key mechanism, the level
repulsion between the sigma and the glueball, gives not only a unified
description of the finite temperature phase transitions, but also a consistent
characterization of the entire QCD phase diagram in the temperature-quark mass
plane.


title: Mesonic correlation lengths in high-temperature QCD

abstract:
  We consider spatial correlation lengths \xi for various QCD light quark
bilinears at temperatures above a few hundred MeV. Some of the correlation
lengths (such as that related to baryon density) coincide with what has been
measured earlier on from glueball-like states; others do not couple to
glueballs, and have a well-known perturbative leading-order expression as well
as a computable next-to-leading-order correction. We determine the latter
following analogies with the NRQCD effective theory, used for the study of
heavy quarkonia at zero temperature: we find (for the quenched case) \xi^{-1} =
2 \pi T + 0.1408 g^2 T, and compare with lattice results. One manifestation of
U_A(1) symmetry non-restoration is also pointed out.


title:
Perspectives for future neutrino oscillation experiments with
  accelerators: beams, detectors and physics

abstract:
  In recent years great progress toward the understanding of the mixing in the
leptonic sector has been made. Nonetheless, this field of research is just at
the beginning. Further advance by accelerator based neutrino oscillation
experiments requires new beams and detectors to reach the wanted physics goals.
In this paper we review the next possible steps that can be done for neutrino
oscillation experiments with accelerators


title: Event Generator for Particle Production in High-Energy Collisions

abstract:
  Event generators are an indispensable tool for the preparation and analysis
of particle-physics experiments. In this contribution, physics principles
underlying the construction of such computer programs are discussed. Results,
within and beyond the Standard Model of particle physics, obtained with a new
event generator are presented. This generator is capable to describe signal
processes for exotic physics and their backgrounds at electron-positron and
proton-(anti)proton colliders.


title:
QCD Sum Rules: Intercrossed Relations for Sigma^0 and Lambda Magnetic
  Moments

abstract:
  New relations between QCD Borel sum rules for magnetic moments of Sigma^0 and
Lambda hyperons are constructed. It is shown that starting from the sum rule
for the Sigma^0 hyperon magnetic moment it is straightforward to obtain the
corresponding sum rule for the Lambda hyperon magnetic moment et vice versa.


title: Antenna Factorization in Strongly-Ordered Limits

abstract:
  When energies or angles of gluons emitted in a gauge-theory process are small
and strongly ordered, the emission factorizes in a simple way to all orders in
perturbation theory. I show how to unify the various strongly-ordered soft,
mixed soft-collinear, and collinear limits using antenna factorization
amplitudes, which are generalizations of the Catani--Seymour dipole
factorization function.


title: Cross sections for multi-particle final states at a linear collider

abstract:
  In this paper total cross sections for signals and backgrounds of top- and
Higgs-production channels in electron-positron collisions at a future linear
collider are presented. All channels considered are characterized by the
emergence of six-particle final states. The calculation takes into account the
full set of tree-level amplitudes in each process. Two multi-purpose parton
level generators, HELAC/PHEGAS and AMEGIC++ are used, their results are found
to be in perfect agreement.


title: Isospin Breaking in $K_{\ell 4}$ Decays of the Charged Kaon

abstract:
  The charged $K_{\ell 4}$ decay, $K^+\to\pi^+\pi^-\ell^+\nu_{\ell}$ is studied
in the framework of chiral perturbation theory based on the effective
Lagrangian including mesons, photons, and leptons. We give analytic expressions
for the two vectorial form factors, $f$ and $g$, calculated at one-loop level
in the presence of Isospin breaking effects. These expressions may then be used
to disentangle the Isospin breaking part from the measured form factors and
hence improve the accuracy in the determination of $\pi\pi$ scattering
parameters from $K_{\ell 4}$ experiments.


title:
Updated analysis of meson-nucleon sigma terms in the perturbative chiral
  quark model

abstract:
  We present an updated analysis of meson-baryon sigma terms in the
perturbative chiral quark model, which is based on effective chiral Lagrangian.
The new feature concerns the inclusion of excited states in the quark
propagator. Its influence on meson loops is shown to lead in particular for the
pion-nucleon sigma term to an enhancement relevant for the current evaluation
of this quantity. We also determine various flavor combinations of the scalar
nucleon form factors and their respective low-momentum transfer limits.


title: Four-Particle Phase Space Integrals in Massless QCD

abstract:
  The inclusive four-particle phase space integral of any $1\to 4$ matrix
element in massless QCD contains divergences due to the soft and collinear
emission of up to two particles in the final state. We show that any term
appearing in this phase space integral can be expressed as linear combination
of only four master integrals. These four master integrals are all computed in
dimensional regularisation up to their fourth order terms, relevant to
next-to-next-to-leading order jet calculations, both in an analytic form and
purely numerically. New analytical and numerical techniques are developed in
this context. We introduce the tripole parametrisation of the four-parton phase
space. Furthermore, we exploit unitarity relations between multi-parton phase
space integrals and multi-loop integrals. For the numerical calculation, the
iterated sector decomposition of loop integrals is extended to phase space
integrals. The results in this paper lead to infrared subtraction terms needed
for the double real radiation contributions to jet physics in $e^+e^-$
annihilation at the next-to-next-to-leading order.


title: Analytic proof that the Quark Model complies with the PCAC theorems

abstract:
  The Weinberg theorem, the Adler self consistency zero, the Goldberger and
Treiman relation and the Gell-Mann Oakes and Renner relation are proved
analytically in full detail for Quark Models. These proofs are independent of
the particular quark-quark interaction, and they are displayed with Feynman
diagrams in a compact notation. I assume the ladder truncation, which is
natural in the Quark Model, and also detail the diagrams that must be included
in each relation. Off mass shell and finite size effects are included in the
quark-antiquark pion Bethe Salpeter vertices. The axial and vector Ward
identities, for the quark propagator and for the ladder, exactly cancel any
model dependence.


title: Saturation and Diffractive DIS

abstract:
  We review QCD based descriptions of diffractive deep inelastic scattering
emphasizing the role of models with parton saturation. These models provide
natural explanation of such experimentally observed facts as the constant ratio
of diffractive and total DIS cross sections as a function of the Bjorken
variable x and Regge factorization of diffractive parton distributions.


title: Particle Production and Propagation in Nuclei

abstract:
  We discuss the effects of gluon radiation by the struck quark and the
subsequent absorption of the produced hadron in deep inelastic lepton-nucleus
scattering. The theoretical picture is compared with HERMES results on
multiplicity ratios.


title: Learning $\gamma$ from $B \to K \pi$ decays

abstract:
  We discuss several cases of $B \to K \pi$ decays in which direct probes of
the weak phase $\gamma$ are possible, and note what improvements are possible.


title: Ultrahigh energy neutrinos and non-linear QCD dynamics

abstract:
  The ultrahigh energy neutrino-nucleon cross sections are computed taking into
account different phenomenological implementations of the non-linear QCD
dynamic s. Based on the color dipole framework, the results for the saturation
model supplemented by DGLAP evolution as well as for the BFKL formalism in the
geometric scaling regime are presented. They are contrasted with recent
calculations using NLO DGLAP and unified BFKL-DGLAP formalisms.


title:
Out-of-equilibrium evolution of quantum fields in the hybrid model with
  quantum back reaction

abstract:
  The hybrid model with a scalar "inflaton" field coupled to a "Higgs" field
with a broken symmetry potential is one of the promising models for inflation
and (p)reheating after inflation. We consider the nonequilibrium evolution of
the quantum fields of this model with quantum back reaction in the Hartree
approximation, in particular the transition of the Higgs field from the
metastable "false vacuum" to the broken symmetry phase. We have performed the
renormalization of the equations of motion, of the gap equations and of the
energy density, using dimensional regularization. We study the influence of the
back reaction on the evolution of the classical fields and of the quantum
fluctuations. We observe that back reaction plays an important role over a wide
range of parameters. Some implications of our investigation for the preheating
stage after cosmic inflation are presented.


title: Neutrino Mixing and Cosmology

abstract:
  We review the consequences of neutrino mixing in the early universe. For both
active-sterile mixing or mixing between three active neutrinos only, the
consequences of oscillations depend crucially upon the size of the universe's
lepton number (relic neutrino asymmetry.)


title:
Higgs production in association with top quark pair at e+e- colliders in
  theories of higher dimensional gravity

abstract:
  The models of large extra compact dimensions, as suggested by Arkani-Hamed,
Dimopoulos and Dvali, predict exciting phenomenological consequences with
gravitational interactions becoming strong at the TeV scale. Such theories can
be tested at the existing and future colliders. In this paper, we study the
contribution of virtual Kaluza-Klein excitations in the process $e^+e^- \to t
\bar t H $ at future linear collider (NLC). We find that the virtual exchange
KK gravitons can modify the cross-section $\sigma(e^+e^- \to t \bar t H)$
significantly from its Standard Model value and will allow the effective string
scale to be probed up to 7.9 TeV.


title:
Model Independent Results for SU(3) Violation in Light-Cone Distribution
  Functions

abstract:
  Using chiral symmetry we investigate the leading SU(3) violation in
light-cone distribution functions phi_M(x) of the pion, kaon, and eta. It is
shown that terms non-analytic in the quark masses do not affect the shape, and
only appear in the decay constants. Predictive power is retained including the
leading analytic m_q operators. With the symmetry violating corrections we
derive useful model independent relations between phi_pi, phi_eta, and phi_K.
Using the soft-collinear effective theory we discuss how factorization
generates the subleading chiral coefficients.


title: Gapless Color-Flavor-Locked Quark Matter

abstract:
  In neutral cold quark matter that is sufficiently dense that the strange
quark mass M_s is unimportant, all nine quarks (three colors; three flavors)
pair in a color-flavor locked (CFL) pattern, and all fermionic quasiparticles
have a gap. We argue that as a function of decreasing quark chemical potential
mu or increasing M_s, there is a quantum phase transition from the CFL phase to
a new ``gapless CFL phase'' in which only seven quasiparticles have a gap. The
transition occurs where M_s^2/mu is approximately equal to 2*Delta, with Delta
the gap parameter. Gapless CFL, like CFL, leaves unbroken a linear combination
Qtilde of electric and color charges, but it is a Qtilde-conductor with a
nonzero electron density. These electrons and the gapless quark quasiparticles
make the low energy effective theory of the gapless CFL phase and,
consequently, its astrophysical properties are qualitatively different from
those of the CFL phase, even though its U(1) symmetries are the same. Both
gapless quasiparticles have quadratic dispersion relations at the quantum
critical point. For values of M_s^2/mu above the quantum critical point, one
branch has conventional linear dispersion relations while the other branch
remains quadratic, up to tiny corrections.


title: Single Z' production at CLIC based on e^- gamma collisions

abstract:
  We analyze the potential of CLIC based on e- gamma collisions to search for
new $Z'$ gauge boson. Single Z' production at e-gamma colliders in two SU(3)_C
X SU(3)_L X U(1)_N models: the minimal model and the model with right-handed
(RH) neutrinos is studied in detail. Results show that new Z' gauge bosons can
be observed at the CLIC, and the cross sections in the model with RH neutrinos
are bigger than those in the minimal one.


title: Generalized Parton Distributions at x->1

abstract:
  Generalized parton distributions at large $x$ are studied in perturbative QCD
approach. As $x\to 1$ and at finite $t$, there is no $t$ dependence for the
GPDs which means that the active quark is at the center of the transverse
space. We also obtain the power behavior: $H_q^\pi(x,\xi,t)\sim
(1-x)^2/(1-\xi^2)$ for pion; $H_q(x,\xi,t)\sim (1-x)^3/(1-\xi^2)^2$ and
$E_q(x,\xi,t)\sim (1-x)^5/(1-\xi^2)^3f(\xi)$ for nucleon, where $f(\xi)$
represents the additional dependence on $\xi$.


title:
Report on the High Energy Phenomena Sessions HE 2, HE 3.2-3.4: Neutrinos
  and Muons. Interactions, Particle Physics Aspects, Astro-Particle Physics and
  Cosmology

abstract:
  The results presented at the 28th International Cosmic Ray Conference on
neutrino and muon physics are summarized. Neutrinos and muons provide a huge
amount of information on particle interactions up to very high energies and on
fundamental particle properties. Results on neutrino oscillations in the
atmospheric and solar neutrino sectors are summarized. Oscillations are well
established in both sectors, and a more precise determination of oscillation
parameters is requested in the next future. Neutrino telescopes taking data and
under construction presented numerous results. Neutrinos as probes of the
Universe are hopefully going to open, together with gravitational waves, a new
era for Astrophysics. Cosmology has entered the precision era and the Dark
Matter quest is still an open problem. Direct and indirect searches are
complementary approaches to the problem. The results presented at this
conference confirm that Astroparticle Physics and, in particular, Neutrino
Physics are leading fields in fundamental research.


title:
Unintegrated CCFM parton distributions and transverse momentum of gauge
  bosons

abstract:
  Transverse momentum distribution of gauge bosons $W^{\pm}$ and $Z^0$ is
calculated using unintegrated parton distributions obtained by solving leading
order CCFM equation(s) in the impact parameter space. For illustration we
compare the results of the fixed-order collinear, soft-gluon resummation and
CCFM approaches. A parameter of a nonperturbative form factor is adjusted to
the D0 data. In contrast to the collinear approach, the leading order
calculation based on the unintegrated CCFM parton distributions generates
transverse momentum distributions of gauge bosons, which are almost consistent
with experimental data provided the parameter of the nonperturbative form
factor is appropriately adjusted. The $W^+$-$W^-$ asymmetry is calculated as a
function of the boson rapidity and transverse momentum. Predictions are given
for RHIC and LHC.


title: Phenomenological Aspects of Heterotic Effective Models At One Loop

abstract:
  We provide a study of the phenomenology of orbifold compactifications of the
heterotic string within the context of supergravity effective theories. Our
investigation focuses on those models where the soft Lagrangian is dominated by
loop contributions to the various soft supersymmetry breaking parameters. We
consider the pattern of masses that are governed by these soft terms and
investigate the implications of certain indirect constraints on supersymmetric
models, such as flavor-changing neutral currents, the anomalous magnetic moment
of the muon and the density of thermal relic neutralinos.


title: The Color Octet Effect from $e^+ e^-\to{J/\psi}+X+\gamma$ at B Factory

abstract:
  We study the initial state radiation process $e^+ e^-\to{J/\psi}+X+\gamma$
for $J/\psi$ production at B factory, and find the cross section is 61% larger
than it's Born one for color octet part and is about half as it's Born one for
color singlet part. Furthermore, the color singlet and color octet signal are
very clearly separated in it's $E_\gamma$ spectra due to kinematics difference.
We suggest to measure this $E_\gamma$ spectra at B factory to determine the
color octet effect.


title:
Pair production in a strong electric field: an initial value problem in
  quantum field theory

abstract:
  We review recent achievements in the solution of the initial-value problem
for quantum back-reaction in scalar and spinor QED. The problem is formulated
and solved in the semiclassical mean-field approximation for a homogeneous,
time-dependent electric field. Our primary motivation in examining
back-reaction has to do with applications to theoretical models of production
of the quark-gluon plasma, though we here address practicable solutions for
back-reaction in general. We review the application of the method of adiabatic
regularization to the Klein-Gordon and Dirac fields in order to renormalize the
expectation value of the current and derive a finite coupled set of ordinary
differential equations for the time evolution of the system. Three time scales
are involved in the problem and therefore caution is needed to achieve
numerical stability for this system. Several physical features, like plasma
oscillations and plateaus in the current, appear in the solution. From the
plateau of the electric current one can estimate the number of pairs before the
onset of plasma oscillations, while the plasma oscillations themselves yield
the number of particles from the plasma frequency.
  We compare the field-theory solution to a simple model based on a
relativistic Boltzmann-Vlasov equation, with a particle production source term
inferred from the Schwinger particle creation rate and a Pauli-blocking (or
Bose-enhancement) factor. This model reproduces very well the time behavior of
the electric field and the creation rate of charged pairs of the semiclassical
calculation. It therefore provides a simple intuitive understanding of the
nature of the solution since nearly all the physical features can be expressed
in terms of the classical distribution function.


title:
Double-lepton polarization asymmetries in the (B -> K l^+ l^-) decay
  beyond the Standard Model

abstract:
  General expressions for the double-lepton polarizations in the (B -> K l^+
l^-) decay are obtained, using model independent effective Hamiltonian,
including all possible interactions. Correlations between the averaged
double-lepton polarization asymmetries and the branching ratio, as well as, the
averaged single-lepton polarization asymmetry are studied. It is observed that,
study of the double-lepton polarization asymmetries can serve as a good test
for establishing new physics beyond the Standard Model.