title: Multichannel Anomaly of the Resonance Pole Parameters Resolved

abstract:
  Inspired by anomalies which the standard scattering matrix pole-extraction
procedures have produced in a mathematically well defined coupled-channel
model, we have developed a new method based solely on the assumption of
partial-wave analyticity. The new method is simple and applicable not only to
theoretical predictions but to the empirical partial-wave data as well. Since
the standard pole-extraction procedures turn out to be the lowest-order term of
the proposed method the anomalies are understood and resolved.


title: Systems of two heavy quarks with effective field theories

abstract:
  I discuss results and applications of QCD nonrelativistic effective field
theories for systems with two heavy quarks.


title:
Single transverse-spin asymmetry in high transverse momentum pion
  production in pp collisions

abstract:
  We study the single-spin (left-right) asymmetry in single-inclusive pion
production in hadronic scattering. This asymmetry is power-suppressed in the
transverse momentum of the produced pion and can be analyzed in terms of
twist-three parton correlation functions in the proton. We present new
calculations of the corresponding partonic hard-scattering functions that
include the so-called "non-derivative" contributions not previously considered
in the literature. We find a remarkably simple structure of the results. We
also present a brief phenomenological study of the spin asymmetry, taking into
account data from fixed-target scattering and also the latest information
available from RHIC. We make additional predictions that may be tested
experimentally at RHIC.


title: A Pseudo-Photon in Non-Trivial Background Fields

abstract:
  We show that in the presence of external fields for which either
$\dot{\vb{B}}^{\mathrm{ext}}\neq 0$ or $\nabla\times\vb{E}^{\mathrm{ext}}\neq
0$ it is not possible to derive the classical Maxwell equations from an action
with only one gauge field. We suggest that one possible solution is to consider
a second physical pseudo-vector gauge field $C$. The action for this theory is
originally motivated by the inclusion of magnetic monopoles. These particles
play no role in this work and our argument is only based in, that the violation
of the Bianchi identities, cannot be accounted at the action level with only
the standard gauge field. We give a particular example for a periodic rotating
external magnetic field. Our construction holds that at classical level both
the vector and pseudo-vector gauge fields $A$ and $C$ are regular. We compare
pseudo-photon with paraphoton (graviphoton) theories concluding that, besides
the mechanisms of gauge symmetry breaking already studied, the Bianchi
identities violation are a crucial difference between both theories. We also
show that, due to Dirac's quantization condition, at quantum field theory level
the effects due to pseudo-photons and photons can be distinguished by the
respective contributions to the magnetic moment of fermions and vacuum
polarization. These effects may be relevant in astrophysical environments,
namely close and inside neutron stars and magnetars. [Erratum: The construction
in this work must, at most, be considered as a conceptual system or toy model.
Are discussed systems where the results may have relevance.]


title: New open and hidden charm spectroscopy

abstract:
  Many new results on open and hidden charm spectroscopy have been obtained
recently. We present a short review of the experimental findings in the meson
sector, of the theoretical interpretations and of the open problems, with a
discussion on the possibility that some mesons are not quark-antiquark states.


title:
NNLO QCD corrections to the B -> X_s gamma matrix elements using
  interpolation in m_c

abstract:
  One of the most troublesome contributions to the NNLO QCD corrections to B ->
X_s gamma originates from three-loop matrix elements of four-quark operators. A
part of this contribution that is proportional to the QCD beta-function
coefficient beta_0 was found in 2003 as an expansion in m_c/m_b. In the present
paper, we evaluate the asymptotic behaviour of the complete contribution for
m_c >> m_b/2. The asymptotic form of the beta_0-part matches the small-m_c
expansion very well at the threshold m_c = m_b/2. For the remaining part, we
perform an interpolation down to the measured value of m_c, assuming that the
beta_0-part is a good approximation at m_c=0. Combining our results with other
contributions to the NNLO QCD corrections, we find BR(B -> X_s gamma) = (3.15
+_ 0.23) x 10^-4 for E_gamma > 1.6 GeV in the B-meson rest frame. The indicated
error has been obtained by adding in quadrature the following uncertainties:
non-perturbative (5%), parametric (3%), higher-order perturbative (3%), and the
interpolation ambiguity (3%).


title:
Aspects of matter-antimatter asymmetries in Astrophysics and
  relativistic heavy ion collisions

abstract:
  Matter -antimatter asymmetry, expected to be very large in the Universe, is
rediscussed considering effects which might not have been considered enterely
before and which can also be relevant for (high energy densities) relativistic
heavy ions collisions. Effects from the phase diagram of strong interactions
are raised for that.


title: Models of flavour with discrete symmetries

abstract:
  We briefly review some recent developments in theoretical models of fermion
masses, mixings and CP violation with discrete non-Abelian symmetries. Then, we
explain the main ideas of a recently proposed Minimal S_3 Invariant Extension
of the Standard Model and its application to a unified analysis of masses,
mixings and CP violation in the leptonic and quark sectors as well as the
explicit computation of the V_PMNS and V_CKM mixing matrices.


title: Searching for CPT violation in top anti-top production

abstract:
  We analyze the possibility of observing CPT violation in the top sector. We
present current bounds on CPT violation in this sector, and analyze the
prospects of improving these bounds at the LHC.


title: The Nucleon Electric Dipole Moment in Light-Front QCD

abstract:
  I present an exact relationship between the electric dipole moment and
anomalous magnetic moment of the nucleon in the light-front formalism of QCD
and consider its consequences.


title: Cosmological Constraints on Gravitino LSP Scenario with Sneutrino NLSP

abstract:
  We study the scenario where a sneutrino is the next lightest supersymmetric
particle (NLSP) and decays into a gravitino and standard model particles. The
daughter particles such as neutrinos and quarks cause electro- and hadronic
showers and affect big-bang nucleosynthesis. It is found that despite a small
branching ratio, four-body processes including quarks in the final state give
the most stringent constraint on the sneutrino abundance for gravitino mass of
1 $-$ 100 GeV. Pion production by high energy neutrinos is important when the
sneutrinos decay at $\sim$ 1 sec. We also discuss the thermal leptogenesis in
the sneutrino NLSP scenario.


title:
Effects of the littlest Higgs model with T-parity on Higgs boson
  production at high energy $e^{+}e^{-}$ colliders

abstract:
  The Higgs boson production processes $e^{+}e^{-}\to
  ZH$, $e^{+}e^{-}\to \bar{\nu_{e}}\nu_{e}H$, and
  $e^{+}e^{-}\to t\bar{t}H$ are very important for studying Higgs boson
properties and further testing new physics beyond the standard model($SM$) in
the high energy linear
  $e^{+}e^{-}$ collider($ILC$). We estimate the contributions of the littlest
Higgs model with T-parity($LHT$ model) to these processes and find that the
$LHT$ model can generate significantly corrections to the production cross
sections of these processes.
  We expect the possible signals of the $LHT$ model can be detected via these
processes in the future $ILC$ experiments.


title: Transient state of matter in hadron and nucleus collisions

abstract:
  We discuss properties of the specific strongly interacting transient
collective state of matter in hadron and nuclei reactions and emphasize
similarity in their dynamics. We consider elliptic flow introduced for
description of nucleus collisions and discuss its possible behavior in hadronic
reactions.


title:
Thermodynamics of the PNJL model with nonzero baryon and isospin
  chemical potentials

abstract:
  We have extended the Polyakov-Nambu-Jona-Lasinio (PNJL) model for two
degenerate flavours to include the isospin chemical potential ($\mu_I$). All
the diagonal and mixed derivatives of pressure with respect to the quark number
(proportional to baryon number) chemical potential ($\mu_0$) and isospin
chemical potential upto sixth order have been extracted at $\mu_0 = \mu_I = 0$.
These derivatives give the generalized susceptibilities with respect to quark
and isospin numbers. Similar estimates for the flavour diagonal and
off-diagonal susceptibilities are also presented. Comparison to Lattice QCD
(LQCD) data of some of these susceptibilities for which LQCD data are
available, show similar temperature dependence, though there are some
quantitative deviations above the crossover temperature. We have also looked at
the effects of instanton induced flavour-mixing coming from the $U_A(1)$ chiral
symmetry breaking 't Hooft determinant like term in the NJL part of the model.
The diagonal quark number and isospin susceptibilities are completely
unaffected. The off-diagonal susceptibilities show significant dependence near
the crossover. Finally we present the chemical potential dependence of specific
heat and speed of sound within the limits of chemical potentials where neither
diquarks nor pions can condense.


title: Radiative B decay spectrum: DGE at NNLO

abstract:
  We compute the differential B -> X_s gamma decay width in the Standard Model
as a function of the photon energy using Dressed Gluon Exponentiation (DGE).
The resummed spectrum is matched with the fixed-order expansion, making use of
the next-to-next-to-leading order (NNLO) results for the matrix element of the
magnetic dipole interaction O_7 and NLO ones for other operators in the
effective Weak Hamiltonian. We develop a new technique to implement constraints
on the analytic structure of the Sudakov factor in moment space. This improves
the behavior of the resummed spectrum away from the Sudakov region. We also
derive an analytic expression for the Borel transform of the perturbative
series for the O_7 spectrum in the large-beta_0 limit. Using this example we
demonstrate that exponentiation in moment space is necessary for the
calculation of the spectrum for E_gamma > 2 GeV. Finally, we investigate
numerically the relation between renormalons, power corrections and support
properties. We present predictions for the branching fraction and the first few
spectral moments as a function of a cut E_gamma>E_0 and estimate the
theoretical uncertainty.


title:
Strangeness measurements of kaon pairs, CP violation and Bell
  inequalities

abstract:
  The nonlocal property of quantum mechanics can be nicely tested in high
energy physics; in particular, the neutral kaon pairs as produced at
DA$\Phi$NE, Frascati, are very well suited. The analogies of kaons as compared
to polarized photons or spin--1/2 particles --the kaonic qubit feature-- are
reviewed. However, there are also fundamental differences which occur due to
the kaon time evolution and due to internal symmetries; in particular, the
violation of CP symmetry is related to the violation of Bell inequalities. Two
type of Bell inequalities for kaons are presented, one for the variation of the
``quasi--spin'' and the other for different detection times of the kaon.


title: Probing Lepton Number Violating Interactions with Beta-beams

abstract:
  We show that a detector placed near a beta-beam storage ring can probe lepton
number violating interactions, as predicted by supersymmetric theories with
R-parity non-conservation. In the presence of such interactions, nu_tau can be
produced during beta-decay leading to tau leptons through weak interactions.
Alternatively, electron neutrinos from beta-decay of radioactive ions can
produce tau leptons in a nearby detector through these interactions. The muons
from the decay of these tau leptons can be readily identified in a small iron
calorimeter detector and will signal violation of R-parity.


title: Magnetic Moment of the Pentaquark THETA+ State

abstract:
  We consider THETA+ pentaquark as a bound state of two vector diquarks and one
anti-quark and calculate its magnetic moment.


title: Thermodynamics of AdS/QCD

abstract:
  We study finite temperature properties of four dimensional QCD-like gauge
theories in the gauge theory/gravity duality picture. The gravity dual contains
two deformed 5d AdS metrics, with and without a black hole, and a dilaton. We
study the thermodynamics of the 4d boundary theory and constrain the two
metrics so that they correspond to a high and a low temperature phase separated
by a first order phase transition. The equation of state has the standard form
for the pressure of a strongly coupled fluid modified by a vacuum energy, a bag
constant. We determine the parameters of the deformation by using QCD results
for $T_c$ and the hadron spectrum. With these parameters, we show that the
phase transition in the 4d boundary theory and the 5d bulk Hawking-Page
transition agree. We probe the dynamics of the two phases by computing the
quark-antiquark free energy in them and confirm that the transition corresponds
to confinement-deconfinement transition.


title:
The ratio of viscosity to entropy density in a pion gas satisfies the
  KSS holographic bound

abstract:
  We evaluate the ratio of shear viscosity to entropy density in a pion gas
employing the Uehling-Uehlenbeck equation and experimental phase-shifts
parameterized by means of the SU(2) Inverse Amplitude Method. We find that the
ratio for this monocomponent gas stays well above the KSS 1/(4 pi) bound. We
find similar results with other sets of phase shifts and conclude the bound is
nowhere violated.


title: On the chiral effective meson-baryon Lagrangian at third order

abstract:
  We show that the recently constructed complete and ``minimal'' third order
meson-baryon effective chiral Lagrangian can be further reduced from 84 to 78
independent operators.


title: Indirect detection of light neutralino dark matter in the NMSSM

abstract:
  We explore the prospects for indirect detection of neutralino dark matter in
supersymmetric models with an extended Higgs sector (NMSSM). We compute, for
the first time, one-loop amplitudes for NMSSM neutralino pair annihilation into
two photons and two gluons, and point out that extra diagrams (with respect to
the MSSM), featuring a potentially light CP-odd Higgs boson exchange, can
strongly enhance these radiative modes. Expected signals in neutrino telescopes
due to the annihilation of relic neutralinos in the Sun and in the Earth are
evaluated, as well as the prospects of detection of a neutralino annihilation
signal in space-based gamma-ray, antiproton and positron search experiments,
and at low-energy antideuteron searches. We find that in the low mass regime
the signals from capture in the Earth are enhanced compared to the MSSM, and
that NMSSM neutralinos have a remote possibility of affecting solar dynamics.
Also, antimatter experiments are an excellent probe of galactic NMSSM dark
matter. We also find enhanced two photon decay modes that make the possibility
of the detection of a monochromatic gamma-ray line within the NMSSM more
promising than in the MSSM.


title: High energy pA collisions in the Color Glass Condensate approach

abstract:
  We present a brief review of phenomenological applications of the gluon
saturation approach to the proton-nucleus collisions at high energies.


title: Analysis of Leptogenesis in Supersymmetric Triplet Seesaw Model

abstract:
  We analyze leptogenesis in a supersymmetric triplet seesaw scenario that
explains the observed neutrino masses, adopting a phenomenological approach
where the decay branching ratios of the triplets and the amount of
CP--violation in its different decay channels are assumed as free parameters.
We find that the solutions of the relevant Boltzmann equations lead to a rich
phenomenology, in particular much more complex compared to the
non--supersymmetric case, mainly due to the presence of an additional Higgs
doublet. Several unexpected and counter--intuitive behaviors emerge from our
analysis: the amount of CP violation in one of the decay channels can prove to
be be irrelevant to the final lepton asymmetry, leading to successful
leptogenesis even in scenarios with a vanishing CP violation in the leptonic
sector; gauge annihilations can be the dominant effect in the determination of
the evolution of the triplet density up to very high values of its mass,
leading anyway to a sizeable final lepton asymmetry, which is also a growing
function of the wash--out parameter K=Gamma_d/H, defined as usual as the ratio
between the triplet decay amplitude Gamma_d and the Hubble constant H; on the
other hand, cancellations in the Boltzmann equations may lead to a vanishing
lepton asymmetry if in one of the decay channels both the branching ratio and
the amount of CP violation are suppressed, but not vanishing. The present
analysis suggests that in the supersymmetric triplet see-saw model successful
leptogenesis can be attained in a wide range of scenarios, provided that an
asymmetry in the decaying triplets can act as a lepton--number reservoir.


title:
Generalizing Cross Products and Maxwell's Equations to Universal Extra
  Dimensions

abstract:
  In the past five years, there has been considerable research on the collider
phenomenology of TeV-scale extra compact dimensions which are universal - i.e.
accessible to all the Standard Model fields. We consider in detail a
fundamental conceptual issue in the higher-dimensional theory: Since the cross
product is only physically meaningful in three spatial dimensions, how do
traditional vector formulas involving the cross product or curl operation
generalize in the case of universal extra dimensions? For example, is angular
momentum physically meaningful, and, if so, how is it related to the position
and momentum vectors? We find that if angular velocity, torque, angular
momentum, and magnetic field, for example, are regarded as anti-symmetric
second-rank tensors instead of pseudovectors, we can construct tensor forms of
the standard cross product and curl equations that do generalize to higher
dimensions. Although Maxwell's equations have been generalized to extra
dimensions in terms of differential forms, we show that our simple technique
casts the generalized Maxwell's equations in a form very similar to the
standard vector calculus. We also provide direct integrals for the fields in a
practical tensor calculus form. We explore the electric and magnetic fields in
detail to show that there are no fundamental conceptual problems hidden in the
theory - e.g. how the Lorentz force can be meaningfully expressed in terms of
the velocity and magnetic field when the traditional cross product and
right-hand rule do not apply. Finally, we explore the effects that
compactification has on the effective form of Maxwell's equations, which could
be useful for direct tests of Coulomb's law.


title: Properties of the light scalar mesons face experimental data

abstract:
  The following topics are considered. 1) Confinement, chiral dynamics, and
light scalar mesons. 2) Chiral shielding of the \sigma(600) 3)The \phi meson
radiative decays about nature of light scalar resonances. 4) The J/\psi decays
about nature of light scalar resonances. 5) The a0(980)\to\gamma\gamma and
f0(980)\to\gamma\gamma decays about nature of light scalar resonances. 6) New
round in \gamma\gamma\to\pi^+\pi^-, the Belle data. 7) The a0(980)-f0(980)
mixing: theory and experiment. Arguments in favor of the four-quark model of
the a0(980) and f0(980) mesons are given.


title: The B -- TAU FCNC connection in SUSY Unified Theories

abstract:
  In the context of SUSY grand unification a link is established between the
hadronic and leptonic soft breaking sectors. Such relation is here exploited in
particular for FCNC processes in B physics. It is shown how bounds on leptonic
FCNC involving the third generation translate into constraints on FC B decays.
In the second part of the contribution we show that tests of lepton
universality in K and B decays can represent an interesting handle to obtain
relevant information on the amount of FCNC in the second and third fermion
generation.


title: Mass Spectrum in R-Parity Violating mSUGRA and Benchmark Points

abstract:
  We investigate in detail the low-energy spectrum of the R-parity violating
mSUGRA model using the computer program \texttt{SOFTSUSY}. We impose the
experimental constraints from the measurement of the anomalous magnetic moment
of the muon, $(g-2)_\mu$, the decay $b\ra s\gamma$ as well as the mass bounds
from direct searches at colliders, in particular on the Higgs boson and the
lightest chargino. We also include a new calculation for the R parity violating
contribution to $\Br(B_s\ra \mu^+\mu^-)$. We then focus on cases where the
lightest neutralino is {\em not} the lightest supersymmetric particle (LSP). In
this region of parameter space either the lightest scalar tau (stau) or the
scalar tau neutrino (tau sneutrino) is the LSP. We suggest four benchmark
points with typical spectra and novel collider signatures for detailed
phenomenological analysis and simulation by the LHC collaborations.


title:
Annihilation Contributions and CP Asymmetries in $B^+ \to \pi^+ K^0, K^+
  K^0$ and $B^0\to K^0 \bar K^0$

abstract:
  Recently the branching ratios for $B^+\to K^+\bar K^0$ and $B^0 \to K^0 \bar
K^0$ have been measured. Data indicate that the annihilation amplitudes in
these decays are not zero. A non-zero annihilation amplitude plays an important
role in CP violation for $B^+\to \pi^+ K^0, K^+ \bar K^0$. Using the measured
branching ratios for these decays, we show that there is an absolute bound of
5% for the size of CP asymmetry in $B^+\to \pi^+ K^0$ from a relation between
the amplitudes of these decays. The size of CP asymmetry in $B^+ \to K^+\bar
K^0$ can, however, be as large as 90%. Future experimental data will test these
predictions.


title: Dimension-2 condensates, zeta-regularization and large-Nc Regge Models

abstract: This paper has been withdrawn because it is a duplicate of [hep-ph/0609266].


abstract:
  Dimension-2 and -4 gluon condensates are re-analyzed in large-Nc Regge models
with the zeta-function regularization which preserves the spectrum in any q
qbar channel separately. We demonstrate that the signs and magnitudes of both
condensates can be properly described within the framework.


title:
Leading-twist pion and kaon distribution amplitudes in the
  gauge-invariant nonlocal chiral quark model from the instanton vacuum

abstract:
  We investigate the leading-twist light-cone distribution amplitudes for the
pion and kaon based on the gauge-invariant nonlocal chiral quark model from the
instanton vacuum in the presence of external axial-vector currents. We find
that the nonlocal contribution from the gauge invariance has much effects on
the pion distribution amplitudes, while it changes mildly the kaon ones. We
also study the Gegenbauer moments of the distribution amplitudes and compare
them with the empirical analysis of the CLEO data.


title:
Two-photon width of eta_b, eta'_b and eta''_b from Heavy-Quark Spin
  Symmetry

abstract:
  We predict the two-photon width of the pseudoscalar bottomonia, Gamma(eta_b
-> gamma gamma), Gamma(eta'_b -> gamma gamma) and Gamma(eta''_b -> gamma gamma)
within a Heavy-Quark Spin-Symmetry setting following the same line as our
recent work for the corresponding decays for charmonia. Binding-energy effects
are included for excited states and are shown to shift up the eta'_b and
eta''_b widths by 10 %. We point out that the essentially model independent
ratio Gamma(eta_b -> gamma gamma)/Gamma(Upsilon -> ll) and the branching ratio
BR(eta_b -> gamma gamma) obtained could be used to extract the coupling
constant alpha_s.


title:
New constraints on R-parity violating couplings through the measurements
  of the $B^0_{s(d)}$-${\bar{B}^0_{s(d)}}$ and $K^0$-$\bar{K}^0$ mixing

abstract:
  We calculate contributions to $B_s-\bar{B}_s$ mixing through tree-level
sneutrino exchange in the framework of the minimal supersymmetric standard
model with R-parity violation, including the next-to-leading-order QCD
corrections. We compare our results with the updated bounds on the
$B_s-\bar{B}_s$ mass difference reported by CDF collaborations, and present new
constraints on the relevant combinations of parameters of the minimal
supersymmetric standard model with R-parity violation. Our results show that
upper bound on the relevant combination of couplings of $B_s-\bar{B}_s$ mixing
is of the order $10^{-9}$. We also calculate the $B^0_d-\bar{B}^0_d$ and
$K^0-\bar{K}^0$ mass differences, and show that the upper bounds on the
relevant combinations of couplings are two and four orders of magnitude
stronger than ones reported in the literatures, respectively. We also discuss
the case of complex couplings and show that how the relevant combinations of
couplings are constrained by the updated experiment data of $B_s-\bar{B}_s$,
$B_d-\bar{B}_d$ mixing and time-dependent CP asymmetry $S_{J/\psi K_s}$, and
future possible observations of $S_{J/\psi\phi}$ at LHCb, respectively.


title: Baryons in AdS/QCD

abstract:
  We construct a holographic model for baryons in the context of AdS/QCD and
study the spin-1/2 nucleon spectra and its couplings to mesons, taking fully
account of the effects from the chiral symmetry breaking. A pair of 5D spinors
is introduced to represent both left and right chiralities. Our model contains
two adjustable parameters, the infrared cutoff and the Yukawa coupling of bulk
spinors to bulk scalars, corresponding to the order parameter of chiral
symmetry. Taking the lowest-lying nucleon mass as an input, we calculate the
mass spectrum of excited nucleons and the nucleon couplings to pions. The
excited nucleons show a parity-doubling pattern with smaller pion-nucleon
couplings.


title: Pressure of the standard model

abstract:
  We review the computation of the thermodynamic pressure of the entire minimal
standard model to three loop order, performed in hep-ph/0510375 and
hep-ph/0512177.


title: K^L_{mu3} decay: A first evidence of Right-Handed Quark Currents ?

abstract:
  The experimental results published by KTeV and the preliminary results from
NA48 concerning the slope of the Kpi scalar form factor suggest a significant
discrepancy with the prediction of the Callan-Treiman low energy theorem once
interpreted within the Standard Model. In this talk, we will show how this
discrepancy could be explained as a first evidence of the direct coupling of
right-handed quarks to W as suggested by certain type of effective electroweak
theories.


title: Diffractive parton distributions from H1 data

abstract:
  We analyse the latest H1 large rapidity gap data to obtain diffractive parton
distributions, using a procedure based on perturbative QCD, and compare them
with distributions obtained from the simplified Regge factorisation type of
analysis. The diffractive parton densities and structure functions are made
publically available.


title: The Standard Model: Alchemy and Astrology

abstract:
  An brief unconventional review of Standard Model physics, containing no
plots.


title: Axion results: what is new?

abstract:
  The PVLAS collaboration has obtained results that may be interpreted in terms
of a light axion-like particle, while the CAST collaboration has not found any
signal of such particles. Moreover, the PVLAS results are in gross
contradiction with astrophysical bounds. We develop a particle physics model
with two paraphotons and with a low energy scale in which these apparent
inconsistencies are circumvented.


title:
Probe the R-parity Violating Supersymmetry Effects in the
  $B^0_s-\bar{B}^0_s$ Mixing

abstract:
  The recent measurements of the $B_s$ mass difference $\Delta M_s$ by the CDF
and D{\O} collaborations are roughly consistent with the Standard Model
predictions, therefore, these measurements will afford an opportunity to
constrain new physics scenarios beyond the Standard Model. We consider the
impact of the R-parity violating supersymmetry in the $B^0_s-\bar{B}^0_s$
mixing, and use the latest experimental results of $\Delta M_s$ to constrain
the size of the R-parity violating tree level couplings in the
$B^0_s-\bar{B}^0_s$ mixing. Then, using the constrained R-parity violating
parameter space from $\Delta M_s$, we show the R-parity violating effects on
the $B_s$ width difference $\Delta\Gamma_{s}$.


title: SU(3)c x SU(4)L x U(1) X model with two Higgs 4-plet scalars

abstract:
  In this work we present an extension of the Standard model as a local gauge
group SU(3)c x SU(4)L x U(1)X embedded in SU(3)c x SU(4)L x U(1)Y0 x U(1)B-L
gauge group. The U(1)Y0 gauge symmetry is introduced to obtain an anomaly-free
three- generation model without exotic electric charges .A minimal scalar
sector is considered with two Higgs 4-Plet representations of SU(4)L and a
singlet scalar The 15-plet gauge bosons of SU(4)L contain two new neutral
bosons which mix with Standard model W. The (B-L) charge is assigned to U(1)B-L
gauge symmetry so thatSU(4)L gauge bosons do not contain bileptons. The model
is analyzed for mass spectrum of Higgses, fermions and gauge bosons with
results similar to an economical 3-3-1 model with two Higgs triplets. In 3-4-1
model both 4-plet scalars contain two neutral components each.There is no
lepton number violation in 3-4-1 case.


title: Thermalization of gluon matter including gg<->ggg interactions

abstract:
  Within a pQCD inspired kinetic parton cascade we simulate the space time
evolution of gluons which are produced initially in a heavy ion collision at
RHIC energy. The inelastic gluonic interactions $gg \leftrightarrow ggg$ do
play an important role: For various initial conditions it is found that
thermalization and the close to ideal fluid dynamical behaviour sets in at very
early times. Special emphasis is put on color glass condensate initial
conditions and the `bottom up thermalization' scenario. Off-equilibrium $3\to
2$ processes make up the very beginning of the evolution leading to an initial
decrease in gluon number and a temporary avalanche of the gluon momentum
distribution to higher transversal momenta.


title:
$B^0_{s(d)} - \bar{B}^0_{s(d)} $ mixing and new physics effects in a top
  quark two-Higgs doublet model

abstract:
  We calculate the new physics contributions to the neutral $B_d^0$ and $B_s^0$
meson mass splitting $\Delta M_d$ and $\Delta M_s$ induced by the box diagrams
involving the charged-Higgs bosons in the top quark two-Higgs doublet model
(T2HDM). Using the precision data, we obtain the bounds on the parameter space
of the T2HDM: (a) for fixed $M_H=400$ GeV and $\delta=[0^\circ,60^\circ]$, the
upper bound on $\tan{\beta}$ is $\tan \beta \leq 30$ after the inclusion of
major theoretical uncertainties; (b) for the case of $\tan{\beta} \leq 20$, a
light charged Higgs boson with a mass around 300 GeV is allowed; and (c) the
bounds on $\tan{\beta}$ and $M_H$ are strongly correlated: a smaller (larger)
$\tan{\beta}$ means a lighter (heavier) charged Higgs boson.


title: Decoupling of heavy quarks in HQET

abstract:
  Decoupling of c-quark loops in b-quark HQET is considered. The decoupling
coefficients for the HQET heavy-quark field and the heavy-light quark current
are calculated with the three-loop accuracy. The last result can be used to
improve the accuracy of extracting f_B from HQET lattice simulations (without
c-quark loops). The decoupling coefficient for the flavour-nonsinglet QCD
current with n antisymmetrized gamma-matrices is also obtained at three loops;
the result for the tensor current (n=2) is new.


title: Polyakov loop, diquarks and the two-flavour phase diagram

abstract:
  An updated version of the PNJL model is used to study the thermodynamics of
N_f = 2 quark flavors interacting through chiral four-point couplings and
propagating in a homogeneous Polyakov loop background. Previous PNJL
calculations are extended by introducing explicit diquark degrees of freedom
and an improved effective potential for the Polyakov loop field. The input is
fixed exclusively by selected pure-gauge lattice QCD results and by pion
properties in vacuum. The resulting (T, \mu) phase diagram is studied with
special emphasis on the critical point, its dependence on the quark mass and on
Polyakov loop dynamics. We present successful comparisons with lattice QCD
thermodynamics expanded to finite chemical potential \mu.


title:
A closed expression for the UV-divergent parts of one-loop tensor
  integrals in dimensional regularization

abstract:
  Starting from the general definition of a one-loop tensor N-point function,
we use its Feynman parametrization to calculate the UV-divergent part of an
arbitrary tensor coefficient in the framework of dimensional regularization. In
contrast to existing recursion schemes, we are able to present a general
analytic result in closed form that enables direct determination of the
UV-divergent part of any one-loop tensor N-point coefficient independent from
UV-divergent parts of other one-loop tensor N-point coefficients. Simplified
formulas and explicit expressions are presented for A-, B-, C-, D-, E-, and
F-functions.


title: Truncated first moment of the parton distribution - a modified approach

abstract:
  We derive the LO DGLAP evolution equation for the full Mellin moments of the
truncated at $x_0$ first moment of the nonsinglet parton distribution. This
"moment of moment" approach allows to determine the small-$x_0$ behaviour of
the truncated first moment. We compare our predictions to results obtained from
$x-$space solutions for parton distributions with use of the Chebyshev
polynomial method and to solutions of the evolution equations for the truncated
moments proposed by other authors. The comparison is performed for different
input parametrisations for $10^{-5}\leq x_0\leq 0.1$ and $1\leq Q^2\leq 100$
${\rm GeV}^2$. We give an example of application to the determination of the
contribution to the Bjorken Sum Rule.


title:
Another Look at the Flavour Structure of the Littlest Higgs Model with
  T-Parity

abstract:
  We discuss the mixing matrix V_Hd that describes the charged and neutral
current interactions between ordinary down-quarks and up- and down-mirror
quarks in the Littlest Higgs Model with T-parity (LHT). We point out that this
matrix in addition to three mixing angles contains three physical complex
phases and not only one as used in the present literature. We explain the
reason for the presence of two additional phases, propose a new standard
parameterization of V_Hd and briefly comment on the relevance of these new
phases for the phenomenology of FCNC processes in the LHT model. In a separate
paper we present a detailed numerical analysis, including these new phases, of
K and B physics, with particular attention to the most interesting rare decays.


title: fastNLO: Fast pQCD Calculations for PDF Fits

abstract:
  We present a method for very fast repeated computations of higher-order cross
sections in hadron-induced processes for arbitrary parton density functions. A
full implementation of the method for computations of jet cross sections in
Deep-Inelastic Scattering and in Hadron-Hadron Collisions is offered by the
"fastNLO" project. A web-interface for online calculations and user code can be
found at http://hepforge.cedar.ac.uk/fastnlo/ .


title:
Resolving Eight-Fold Neutrino Parameter Degeneracy by Two Identical
  Detectors with Different Baselines

abstract:
  We have shown in a previous paper that two identical detectors with each
fiducial mass of 0.27 megaton water, one in Kamioka and the other in Korea,
which receive the (anti-) muon neutrino beam of 4 MW power from J-PARC facility
have potential of determining the neutrino mass hierarchy and discovering CP
violation by resolving the degeneracies associated with them. In this paper, we
point out that the same setting has capability of resolving the \theta_{23}
octant degeneracy in region where sin^2 2\theta_{23} \lsim 0.97 at 2 standard
deviation confidence level even for very small values of \theta_{13}.
Altogether, it is demonstrated that one can solve all the eight-fold neutrino
parameter degeneracies in situ by using the Tokai-to-Kamioka-Korea setting if
\theta_{13} is within reach by the next generation superbeam experiments. We
also prove the property called ``decoupling between the degeneracies'', which
is valid to first order in perturbation theory of the earth matter effect, that
guarantees approximate independence between analyses to solve any one of the
three different type of degeneracies.


title:
Single top quark production at the Tevatron: threshold resummation and
  finite-order soft gluon corrections

abstract:
  I present a calculation of threshold soft-gluon corrections to single top
quark production in ppbar collisions via all partonic processes in the t and s
channels and via associated top quark and W boson production. The soft-gluon
corrections are formally resummed to all orders, and finite-order expansions of
the resummed cross section are calculated through
next-to-next-to-next-to-leading order (NNNLO) at next-to-leading logarithmic
(NLL) accuracy. Numerical results for single top quark production at the
Tevatron are presented, including the dependence of the cross sections on the
top quark mass and on the factorization and renormalization scales. The
threshold corrections in the t channel are small while in the s channel they
are large and dominant. Associated tW production remains relatively minor due
to the small leading-order cross section even though the K factors are large.


title:
Low Scale Seesaw, Electron EDM and Leptogenesis in a Model with
  Spontaneous CP Violation

abstract:
  Strong correlations between leptogenesis and low energy CP violating leptonic
processes have been shown by us to exist in the minimal left-right symmetric
model with spontaneous CP violation. In this note, we investigate the
implications of this model for the electric dipole moment of the electron. With
an additional broken U(1)_H symmetry, the seesaw scale can be lowered to close
to the electroweak scale. This additional symmetry also makes the connection
between CP violation in quark sector to that in the lepton sector possible.


title: NNLO QCD corrections to B -> X_s gamma

abstract:
  Current status of the NNLO QCD corrections to B -> X_s gamma is reviewed. The
calculations include three-loop matching conditions, four-loop anomalous
dimensions as well as two- and three-loop on-shell amplitudes. Certain parts of
the three-loop matrix elements are found by interpolation in the charm quark
mass between the large-beta_0 approximation in the m_c=0 case and the complete
result in the m_c >> m_b/2 case.


title:
Increasing the Neutralino Relic Abundance with Slepton Coannihilations:
  Consequences for Indirect Dark Matter Detection

abstract:
  We point out that if the lightest supersymmetric particle (LSP) is a
Higgsino- or Wino-like neutralino, the net effect of coannihilations with
sleptons is to increase the relic abundance, rather than producing the usual
suppression, which takes place if the LSP is Bino-like. The reason for the
enhancement lies in the effective thermally averaged cross section at
freeze-out: sleptons annihilate (and co-annihilate) less efficiently than the
neutralino(s)-chargino system, therefore slepton coannihilations effectively
act as parasite degrees of freedom at freeze-out. Henceforth, the thermal relic
abundance of LSP's corresponds to the cold Dark Matter abundance for smaller
values of the LSP mass, and larger values of the neutralino pair annihilation
cross section. In turn, at a given thermal neutralino relic abundance, this
implies larger indirect detection rates, as a result of an increase in the
fluxes of antimatter, gamma rays and neutrinos from the Sun orginating from
neutralino pair annihilations.


title: A global analysis of inclusive diffractive cross sections at HERA

abstract:
  We describe the most recent data on the diffractive structure functions from
the H1 and ZEUS Collaborations at HERA using four models. First, a Pomeron
Structure Function (PSF) model, in which the Pomeron is considered as an object
with parton distribution functions. Then, the Bartels Ellis Kowalski Wusthoff
(BEKW) approach is discussed, assuming the simplest perturbative description of
the Pomeron using a two-gluon ladder. A third approach, the Bialas Peschanski
(BP) model, based on the dipole formalism is then described. Finally, we
discuss the Golec-Biernat-W\"usthoff (GBW) saturation model which takes into
account saturation effects. The best description of all avaible measurements
can be achieved with either the PSF based model or the BEKW approach. In
particular, the BEKW prediction allows to include the highest $\beta$
measurements, which are dominated by higher twists effects and provide an
efficient and compact parametrisation of the diffractive cross section. The two
other models also give a good description of cross section measurements at
small $x$ with a small number of parameters. The comparison of all predictions
allows us to identify interesting differences in the behaviour of the effective
pomeron intercept and in the shape of the longitudinal component of the
diffractive structure functions. In this last part, we present some features
that can be discriminated by new experimental measurements, completing the HERA
program.


title:
Decays of Supersymmetric Particles: the program SUSY-HIT
  (SUspect-SdecaY-Hdecay-InTerface)

abstract:
  We present the program package SUSY-HIT for the computation of supersymmetric
particle decays within the framework of the Minimal Supersymmetric extension of
the Standard Model. The code is based on two existing programs HDECAY and
SDECAY for the calculation of the decay widths and branching ratios of,
respectively, the MSSM Higgs bosons and the SUSY particles, and calls a program
for the calculation of the SUSY particle spectrum such as SuSpect. Including
all important higher order effects, the package allows the consistent
calculation of the MSSM particle spectrum and decays with the presently highest
level of precision.


title: Same-sign top quarks as signature of light stops

abstract:
  We present a new method to search for a light scalar top (stop), decaying
dominantly into $c\tilde\chi^0_1$, at the LHC. The principal idea is to exploit
the Majorana nature of the gluino, leading to same-sign top quarks in events of
gluino pair production followed by gluino decays into top and stop. We
demonstrate the reach of our method in terms of the gluino mass and the
stop-neutralino mass difference.


title: Heavy Quark Effective Theory computation of the mass of the bottom quark

abstract:
  We present a fully non-perturbative computation of the mass of the b-quark in
the quenched approximation. Our strategy starts from the matching of HQET to
QCD in a finite volume and finally relates the quark mass to the spin averaged
mass of the Bs meson in HQET. All steps include the terms of order Lambda^2/Mb.
Expanding on [1], we discuss the computation and renormalization of correlation
functions at order 1/Mb. With the strange quark mass fixed from the Kaon mass
and the QCD scale set through r0=0.5 fm, we obtain a renormalization group
invariant mass Mb = 6.758(86) GeV or mb(mb)= 4.347(48) GeV in the MS-bar
scheme. The uncertainty in the computed Lambda^2/Mb terms contributes little to
the total error and Lambda^3/Mb^2 terms are negligible. The strategy is
promising for full QCD as well as for other B-physics observables.


title: The Dark Side of mSUGRA

abstract:
  We study the mu<0 branch of the minimal supergravity ansatz of the minimal
supersymmetric standard model. The extent to which mu<0 is disfavoured compared
to mu>0 in global fits is calculated with Markov Chain Monte Carlo methods and
bridge sampling. The fits include state-of-the-art two-loop MSSM contributions
to the electroweak observables M_W and sin^2 theta_w^l, as well as the
anomalous magnetic moment of the muon (g-2)_mu, the relic density of dark
matter and other relevant indirect observables. mu<0 is only marginally
disfavoured in global fits and should be considered in mSUGRA analyses. We
estimate that the ratio of probabilities is P(mu<0) / P(mu>0)=0.07-0.16.


title: Spin Correlations in Decay Chains Involving W Bosons

abstract:
  We study the extent to which spin assignments of new particles produced at
the LHC can be deduced in the decay of a scalar or fermion C into a new stable
(or quasi-stable) particle A through the chain C \to B^\pm q, B^\pm \to A
W^\pm, W^\pm \to \ell^\pm \nu_\ell where \ell=e,\mu. All possible spin
assignments of the particles A and B are considered in order to remain as
model-independent as possible. Explicit invariant mass distributions of the
quark and lepton are given for each set of spins, valid for all masses. We also
construct the asymmetry between the chains with a W- and those with a W+. The
Kullback-Leibler distance between the distributions is then calculated to give
a quantitative measure of our ability to distinguish the different spin
assignments.


title: A new bridge between leptonic CP violation and leptogenesis

abstract:
  Flavor effects due to lepton interactions in the early Universe may have
played an important role in the generation of the cosmological baryon asymmetry
through leptogenesis. If the only source of high-energy CP violation comes from
the left-handed leptonic sector, then it is possible to establish a bridge
between flavored leptogenesis and low-energy leptonic CP violation. We explore
this connection taking into account our present knowledge about low-energy
neutrino parameters and the matter-antimatter asymmetry observed in the
Universe. In this framework, we find that leptogenesis favors a hierarchical
light neutrino mass spectrum, while for quasi-degenerate and inverted
hierarchical neutrino masses there is a very narrow allowed window. The
absolute neutrino mass scale turns out to be m < 0.1 eV.


title:
Three body kinematic endpoints in SUSY models with non-universal Higgs
  masses

abstract:
  We derive and present expressions for the kinematic endpoints that arise in
the invariant mass distributions of visible decay products of cascade decays
featuring a two body decay followed by a three body decay. This is an extension
of a current technique that addresses chains of successive two body decays. We
then apply these to a supergravity model with Non-Universal Higgs Masses
(NUHM), having simulated a data set using the ATLFAST detector simulation. We
find that, should such a model be chosen by nature, the endpoints will be
visible in ATLAS data, and we discuss the problems associated with mass
reconstruction in models with a similar phenomenology.


title: Next-leading BFKL effects in forward-jet production at HERA

abstract:
  We show that next-leading logarithmic (NLL) Balitsky-Fadin-Kuraev-Lipatov
(BFKL) effects can be tested by the forward-jet cross sections recently
measured at HERA. For d\sigma/dx, the NLL corrections are small which confirms
the stability of the BFKL description. The triple differential cross section
d\sigma/dxdk_T^2dQ^2 is sensitive to NLL effects and opens the way for an
experimental test of the full BFKL theoretical framework at NLL accuracy.


title: Anomalous enhancement of a penguin hadronic matrix element in B->K eta'

abstract:
  We estimate the density matrix element for the pi^0, eta and eta' production
from the vacuum in the large-N_c limit. As a consequence, we find that the QCD
axial anomaly leads to highly non-trivial corrections to the usual flavour
SU(3) relations between B^0-> K^0 pi^0, B^0-> K^0 eta and B^0-> K^0 eta' decay
amplitudes. These corrections may explain why the B-> K eta' branching ratio is
about six times larger than the B-> K pi one.


title: The thermal nature of high p_T photons in high energy nuclear collisions

abstract:
  We discuss the recent status of some penetrating electromagnetic probes of
relativistic nuclear collisions, and the information contained in their
measurement. We concentrate in turn on sources that produce high p_T photons:
those of purely thermal origin, those producing direct photons, those related
to jet fragmentation, and those associated with the interaction of jets with
the colored plasma. Whenever possible, we compare with RHIC data and in some
cases we make predictions for the LHC.


title: $e^+e^- \to \gamma X(3872)$ near the $D^* {\bar D}^*$ threshold

abstract:
  We evaluate the cross section of the process $e^+e^- \to \gamma X(3872)$ in
terms of the content of the $D^{*0} {\bar D}^0$ `molecular' component in the
wave function of the resonance X(3872). If this component is dominating, the
cross section of the reaction $e^+e^- \to \gamma X(3872)$ can reach up to about
$10^{-3}$ of that for $e^+e^- \to D^* {\bar D}^*$ at energy slightly above the
$D^* {\bar D}^*$ threshold, and the considered process can be a realistic
source of the X(3872) particles for the studies of this resonance.


title: Long distance effects in semi-inclusive B decays

abstract:
  We discuss some issues on factorization of long distance effects for
semi-inclusive B decay spectra in full QCD and in the effective theory.


title:
Supergravity can reconcile dark matter with lepton number violating
  neutrino masses

abstract:
  Supersymmetry offers a cold dark matter candidate, provided that lepton
number is {\em not violated by an odd number of units}. On the other hand,
lepton number violation by even (two) units gives us an attractive mechanism of
neutrino mass generation. Here we offer an explanation of this, in a
supergravity framework underlying a supersymmetric scenario, the essential
feature being particles carrying lepton numbers, which interact only
gravitationally with all other known particles. It is shown that one can have
the right amount of $\Delta L = 2$ effect giving rise to neutrino masses,
whereas the lifetime for $\Delta L = 1$ decays of the lightest supersymmetric
particle can be prolonged beyond the present age of the universe.


title:
Study of the effect of neutrino oscillations on the supernova neutrino
  signal in the LVD detector

abstract:
  The LVD detector, located in the INFN Gran Sasso National Laboratory (Italy),
studies supernova neutrinos through the interactions with protons and carbon
nuclei in the liquid scintillator and interactions with the iron nuclei of the
support structure. We investigate the effect of neutrino oscillations in the
signal expected in the LVD detector. The MSW effect has been studied in detail
for neutrinos travelling through the collapsing star and the Earth. We show
that the expected number of events and their energy spectrum are sensitive to
the oscillation parameters, in particular to the mass hierarchy and the value
of $\theta_{13}$, presently unknown. Finally we discuss the astrophysical
uncertainties, showing their importance and comparing it with the effect of
neutrino oscillations on the expected signal.


title: Herwig++ 2.0 Release Note

abstract:
  A new release of the Monte Carlo program Herwig++ (version 2.0) is now
available. This is the first version of the program which can be used for
hadron-hadron physics and includes the full simulation of both initial- and
final-state QCD radiation.


title:
Experimental tests for the Babu-Zee two-loop model of Majorana neutrino
  masses

abstract:
  The smallness of the observed neutrino masses might have a radiative origin.
Here we revisit a specific two-loop model of neutrino mass, independently
proposed by Babu and Zee. We point out that current constraints from neutrino
data can be used to derive strict lower limits on the branching ratio of
flavour changing charged lepton decays, such as $\mu \to e \gamma$.
Non-observation of Br($\mu \to e \gamma$) at the level of $10^{-13}$ would rule
out singly charged scalar masses smaller than 590 GeV (5.04 TeV) in case of
normal (inverse) neutrino mass hierarchy. Conversely, decay branching ratios of
the non-standard scalars of the model can be fixed by the measured neutrino
angles (and mass scale). Thus, if the scalars of the model are light enough to
be produced at the LHC or ILC, measuring their decay properties would serve as
a direct test of the model as the origin of neutrino masses.


title: Inclusive and diffractive deep inelastic scattering in high-energy QCD

abstract:
  In the context of both inclusive and diffractive deep inelastic scattering,
we derive the first phenomenological consequences of the inclusion of Pomeron
loops in the QCD evolution equations towards high energy. We discuss the
transition between the well-known geometric scaling regime and the new
diffusive scaling, that emerges for sufficiently high energies and up to very
large values of Q^2, well above the proton saturation momentum.


title: Infrared finite coupling in Sudakov resummation: the precise set-up

abstract:
  I show that Sudakov resummation takes a transparent form if one deals with
the second logarithmic derivative of the short distance coefficient functions
for deep inelastic scattering and the Drell-Yan process. A uniquely defined
Sudakov exponent emerges, and the constant terms not included in the exponent
are conjectured to be given by the second logarithmic derivative of the
massless quark form factor. The precise framework for the implementation of the
dispersive approach to power corrections is set-up, yielding results in
agreement with infrared renormalon expectations, but which are not tied to the
single (dressed) gluon exchange approximation. Indications for a Banks-Zaks
type of perturbative fixed point in the Sudakov effective coupling at low N_f
are pointed out. Existence of a fixed point in the Sudakov coupling is argued
to imply its universality.


title: Photon gas dynamics in the early universe

abstract:
  Quantum electrodynamics predicts that photons undergo one-loop scattering.
The combined effect of this on the behaviour of a photon gas for temperatures
above 10^{10} K results in a softening of the equation of state. We calculate
the effect this has on the effective equation of state in the early universe,
taking into account all the species of the Standard Model. The change to the
dynamics of the early universe is discussed.


title:
Probing QCD Corrections to QED Effects Through Optical Experiments in
  Vacuum

abstract:
  A numerical estimative error of the magnitude of the vacuum polarization
effect due to electron-positron by a factor of $10^3$ in [PRL97(2006)100403;
269901(E)] invalidates the study carried in this work in its present context.


title:
The extraction of the bare triple-Pomeron vertex; a crucial ingredient
  for diffraction

abstract:
  The triple-Pomeron coupling lies at the heart of the predictions for high
energy diffractive processes. We explain why the existing determinations, which
use single-particle inclusive hadronic data a+b -> a+Y, underestimate the value
of the bare coupling, due to the neglect of soft rescattering which populates
the rapidity gaps. We describe how data for the process gamma+p -> J/psi +Y can
be used to give a much more reliable estimate of the bare coupling. We use the
existing, fragmentary, J/psi data from HERA to show that the triple-Pomeron
coupling is probably about 3 times larger than the previous determinations. We
emphasize the importance of an explicit measurement of the mass spectrum of the
Y system which accompanies J/psi production at HERA. The consequences for ultra
high energy cosmic ray showers are mentioned.


title: Matching Parton Shower and matrix elements in QED

abstract:
  We report on a high-precision calculation of the Bhabha process in QED, of
interest for precise luminosity determination of low-energy electron-positron
colliders. The calculation is based on the matching of exact next-to-leading
order corrections with a Parton Shower algorithm. The structure of the
algorithm (implemented in an improved version of the event generator BABAYAGA)
is illustrated, with a discussion on the resulting theoretical uncertainty, of
the order of 0.1 %.


title:
Kaonic Quantum Erasers at KLOE 2: ``Erasing the Present, changing the
  Past''

abstract:
  Neutral kaons are unique quantum systems to show some of the most puzzling
peculiarities of quantum mechanics. Here we focus on a quantitative version of
Bohr's complementary principle and on quantum marking and eraser concepts. In
detail we show that neutral kaons (1) are kind of double slit devices
encapsulating Bohr's complementarity principle in a simple and transparent way,
and (2) offer marking and eraser options which are not afforded by other
quantum systems and which can be performed at the DAPHNE machine.


title:
Relating seesaw neutrino masses, lepton flavor violation and SUSY
  breaking

abstract:
  We discuss a GUT realization of the supersymmetric triplet seesaw
mechanism(recently proposed by us in hep-ph/0604083 and further analyzed in
hep-ph/0607298) where the exchange of the heavy triplet states generates both
neutrino masses and soft SUSY breaking terms.


title: E$_6$SSM

abstract:
  In this talk we discuss an $E_6$ inspired supersymmetric (SUSY) model with an
extra $U(1)_{N}$ gauge symmetry under which right-handed neutrinos have zero
charge. In this exceptional supersymmetric standard model (E$_6$SSM) the
$\mu$-term is generated dynamically after the electroweak symmetry breaking. We
specify the particle content of the model and argue that the presence of a $Z'$
and exotic particles predicted by E$_6$SSM allows the lightest Higgs boson to
be significantly heavier than in the MSSM and NMSSM. Other possible
manifestations of E$_6$SSM at the LHC are also discussed.


title: Electric dipole moment constraints on minimal electroweak baryogenesis

abstract:
  We study the simplest generic extension of the Standard Model which allows
for conventional electroweak baryogenesis, through the addition of dimension
six operators in the Higgs sector. At least one such operator is required to be
CP-odd, and we study the constraints on such a minimal setup, and related
scenarios with minimal flavor violation, from the null results of searches for
electric dipole moments (EDMs), utilizing the full set of two-loop
contributions to the EDMs. The results indicate that the current bounds are
stringent, particularly that of the recently updated neutron EDM, but fall
short of ruling out these scenarios. The next generation of EDM experiments
should be sufficiently sensitive to provide a conclusive test.


title:
Perturbation theory and non-perturbative renormalization flow in scalar
  field theory at finite temperature

abstract:
  We use the non-perturbative renormalization group to clarify some features of
perturbation theory in thermal field theory. For the specific case of the
scalar field theory with O(N) symmetry, we solve the flow equations within the
local potential approximation. This approximation reproduces the perturbative
results for the screening mass and the pressure up to order g^3, and starts to
differ at order g^4. The method allows a smooth extrapolation to the regime
where the coupling is not small, very similar to that obtained from a simple
self-consistent approximation.


title:
Signals of the littlest Higgs model with T-parity at $e\gamma$ and $ep$
  collisions

abstract:
  Littlest Higgs model with T-parity predicts the existence of the neutral,
weakly interacting, new gauge boson $B_{H}$, which can be seen as an attractive
dark matter candidate. We study production of the new gauge boson $B_{H}$ via
$e\gamma$ and $ep$ collisions. We find that $B_{H}$ can be abundantly produced
via the subprocesses $e^{-}\gamma\to L^{-}B_{H}$ and $\gamma q\to B_{H}Q$,
which might give rise to characteristic signals. Some discussions about the
$SM$ backgrounds for this kind of signals are also given.


title: Neutrino masses and CDM in a non-supersymmetric model

abstract:
  We propose a model for neutrino mass generation based on both the tree-level
seesaw mechanism with a single right-handed neutrino and one-loop radiative
effects in a non-supersymmetric framework. The generated mass matrix is
composed of two parts which have the same texture and produce neutrino mass
eigenvalues and mixing suitable for the explanation of neutrino oscillations.
The model has a good CDM candidate which contributes to the radiative neutrino
mass generation. The stability of the CDM candidate is ensured by $Z_2$ which
is the residual symmetry of a spontaneously broken U(1)$^\prime$. We discuss
the values of $U_{e3}$ and also estimate the masses of the relevant fields to
realize an appropriate abundance of the CDM.


title: $\mu-\tau$ Symmetry and Radiatively Generated Leptogenesis

abstract:
  We consider a $\mu-\tau$ symmetry in neutrino sectors realized at GUT scale
in the context of a seesaw model. In our scenario, the exact $\mu-\tau$
symmetry realized in the basis where the charged lepton and heavy Majorana
neutrino mass matrices are diagonal leads to vanishing lepton asymmetries. We
find that, in the minimal supersymmetric extension of the seesaw model with
large $\tan\beta$, the renormalization group (RG) evolution from GUT scale to
seesaw scale can induce a successful leptogenesis even without introducing any
symmetry breaking terms by hand, whereas such RG effects lead to tiny
deviations of $\theta_{23}$ and $\theta_{13}$ from $\pi/4$ and zero,
respectively. It is shown that the right amount of the baryon asymmetry
$\eta_B$ can be achieved via so-called resonant leptogenesis, which can be
realized at rather low seesaw scale with large $\tan\beta$ in our scenario so
that the well-known gravitino problem is safely avoided.


title: Dynamically generated 1^+ heavy mesons

abstract:
  By using a heavy chiral unitary approach, we study the $S$ wave interactions
between heavy vector meson and light pseudoscalar meson. By searching for poles
of the unitary scattering amplitudes in the appropriate Riemann sheets, several
$1^+$ heavy states are found. In particular, a $D^*K$ bound state with a mass
of $2.462\pm0.010$ GeV which should be associated with the recently observed
$D_{s1}(2460)$ state is obtained. In the same way, a $B^*{\bar K}$ bound state
($B_{s1}$) with mass of $5.778\pm0.007$ GeV in the bottom sector is predicted.
The spectra of the dynamically generated $D_1$ and $B_1$ states in the $I=1/2$
channel are also calculated. One broad state and one narrow state are found in
both the charmed and bottom sectors. The coupling constants and decay widths of
the predicted states are further investigated.


title: Light pseudo-Goldstone bosons without explicit symmetry breaking

abstract:
  A mechanism is discussed to obtain light scalar fields from a spontaneously
broken continuous symmetry without explicitly breaking it. If there is a
continuous manifold of classical vacua in orbit space, its tangent directions
describe classically massless fields that may acquire mass from perturbations
of the potential that do not break the symmetry. We consider the simplest
possible example, involving a scalar field in the adjoint representation of
SU(N). We study the scalar mass spectrum and its RG running at one-loop level
including scalar and pseudoscalar Yukawa couplings to a massive Dirac fermion.


title: Methods and Models for the Study of Decoherence

abstract:
  We shall review methods used in the description of decoherence on particle
probes in experiments due to surrounding media. This will include conventional
media as well as a model for space-time foam arising from non-critical string
theory.


title: Prospects for Non-Standard Interactions at MiniBooNE

abstract:
  MiniBooNE is expected to soon report analysis of their closed data set, and
we here consider what effect direct non-standard neutrino interactions would
have on their observations. Current direct limits on non-standard interactions
make interpretation of a $\nu_e$ signal at MiniBooNE as three-flavor
oscillations plus direct interactions untenable. However, $\nu_\tau$ from
non-standard interactions at the source could contribute to a $\nu_\mu$ deficit
which may be observable if non-standard interactions are sizable.


title: Tevatron-for-LHC Report of the QCD Working Group

abstract:
  The experiments at Run 2 of the Tevatron have each accumulated over 1 inverse
femtobarn of high-transverse momentum data. Such a dataset allows for the first
precision (i.e. comparisons between theory and experiment at the few percent
level) tests of QCD at a hadron collider. While the Large Hadron Collider has
been designed as a discovery machine, basic QCD analyses will still need to be
performed to understand the working environment. The Tevatron-for-LHC workshop
was conceived as a communication link to pass on the expertise of the Tevatron
and to test new analysis ideas coming from the LHC community. The TeV4LHC QCD
Working Group focussed on important aspects of QCD at hadron colliders: jet
definitions, extraction and use of Parton Distribution Functions, the
underlying event, Monte Carlo tunes, and diffractive physics. This report
summarizes some of the results achieved during this workshop.


title:
Natural electroweak symmetry breaking in generalised mirror matter
  models

abstract:
  It has recently been pointed out that the mirror or twin Higgs model is more
technically natural than the standard model, thus alleviating the ``little''
hierarchy problem. In this paper we generalise the analysis to models with an
arbitrary number of isomorphic standard model sectors, and demonstrate that
technical naturalness increases with the number of additional sectors. We
consider two kinds of models. The first has $N$ standard model sectors
symmetric under arbitrary permutations thereof. The second has $p$ left-chiral
standard model sectors and $p$ right-chiral or mirror standard model sectors,
with $p$-fold permutation symmetries within both and a discrete parity
transformation interchanging left and right. In both kinds of models the
lightest scalar has an invisible width fraction 1/N, which will provide an
important means of experimentally testing this class of models.


title: The flux-tube phase transition

abstract:
  We consider the phase transition in the "hot" dual long-distances Yang-Mills
theory at finite temperature $T$. This phase transition is associated with a
change of symmetry. The dual model is formulated in terms of two-point Wightman
functions with equations of motion involving higher derivatives. The effective
mass of the dual gauge field is derived as a function of $T$-dependent gauge
coupling constant.


title: Progress in nonequilibrium quantum field theory III

abstract:
  We review recent developments and open questions for the description of
nonequilibrium quantum fields, continuing hep-ph/0302210 and hep-ph/0410330.


title:
Generalized Instantaneous Bethe-Salpeter Equation and Exact Quark
  Propagators

abstract:
  A three-dimensional reduction of the homogeneous Bethe-Salpeter equation
retaining, in contrast to the Salpeter equation, the exact propagators (crucial
for, e.g., a proper incorporation of dynamical chiral symmetry breakdown) is
proposed. This formalism may be easily extended to Bethe-Salpeter equations for
bound states composed of particles that are not, or not all, identical to
spin-1/2 fermions as well as to three-dimensional reductions of the
Bethe-Salpeter equation different from Salpeter's equation.


title: Event rates for WIMP detection

abstract:
  The event rates for the direct detection of dark matter for various types of
WIMPs are presented. In addition to the neutralino of SUSY models, we
considered other candidates (exotic scalars as well as particles in
Kaluza-Klein and technicolour theories) with masses in the TeV region. Then one
finds reasonable branching ratios to excited states. Thus the detection of the
WIMP can be made not only by recoil measurements, but by measuring the
de-excitation $\gamma$-rays as well.


title: Electroweak corrections to the charged current Drell-Yan process

abstract:
  A concise review about the status of the calculation of radiative corrections
to the Drell-Yan processes is presented. The effect of matching together exact
electroweak O(alpha) corrections with higher-order QED effects due to multiple
photon emission is displayed in some physical distributions in the charged
current channel, which have obtained with the new version of the event
generator HORACE.


title: QCD, Spin-Glass and String

abstract:
  When quarks and gluons are led to form a dense medium, like in high energy
or/and heavy-ion collisions, it is interesting to ask the question which are
the relevant degrees of freedom that Quantum Chromodynamics predict. The
present notes correspond to two lectures given at Zakopane in the (rainy)
summer of 2006, where this question is adressed concretely in two cases, one in
the regime of weak coupling, the other one at strong coupling. Each case
corresponds to the study of a dynamically important transient phase of quarks
and gluons expected to appear from Quantum Chromodynamics.
  In lecture I, we examine the dynamical phase space of gluon transverse
momenta near the so-called ``saturation'' phase including its fluctuation
pattern.
  In lecture II, we study the dynamics of strongly interacting gauge-theory
matter (modelling quark-gluon plasma) using the AdS/CFT duality between gauge
field theory at strong coupling and a gravitational background in Anti-de
Sitter space.


title: Discovery potential of radiative neutralino production at the ILC

abstract:
  We study radiative neutralino production e^+e^- \to \tilde\chi^0_1
\tilde\chi^0_1\gamma at the linear collider with longitudinally polarised
beams. We consider the Standard Model background from radiative neutrino
production e^+e^- \to \nu \bar\nu \gamma, and the supersymmetric radiative
production of sneutrinos e^+e^- \to \tilde\nu \tilde\nu^\ast \gamma, which can
be a background for invisible sneutrino decays. We give the complete tree-level
formulas for the amplitudes and matrix elements squared. In the Minimal
Supersymmetric Standard Model, we study the dependence of the cross sections on
the beam polarisations, on the parameters of the neutralino sector, and on the
selectron masses. We show that for bino-like neutralinos longitudinal polarised
beams enhance the signal and simultaneously reduce the background, such that
statistics is significantly enhanced. We point out that there are parameter
regions where radiative neutralino production is the only channel to study SUSY
particles, since heavier neutralinos, charginos and sleptons are too heavy to
be pair-produced in the first stage of the linear collider with \sqrt{s}=500
GeV.


title: Equation of State of Gluon Plasma from Local Action

abstract:
  We review recent analytic and numerical results concerning the confinement
scenario in Coulomb gauge. We then consider a local, renormalizable,
BRST-invariant action for QCD in Coulomb gauge that contains auxiliary bose and
fermi ghost fields and sources. When the auxiliary fields are integrated out,
one obtains the standard Coulomb gauge action with a cut-off at the Gribov
horizon. We use the local formulation to calculate the leading correction to
the Stefan-Boltzmann equation of state at high temperature due to the cut-off
at the Gribov horizon. It is of order $g^6$, which is precisely the order at
which the infrared divergence found by Lind\'{e} divergence first occurs. No
such divergence arises in the present calculation because the propagator of
would-be physical gluons is suppressed in the infrared due to the proximity of
the Gribov horizon in infrared directions.


title: Matrix elements and Parton Shower in the event generator BABAYAGA

abstract:
  A new version of the event generator BABAYAGA is presented, which is based on
an original matching of the Parton Shower approach with the complete exact
O(alpha) matrix element for the inclusion of the QED radiative corrections to
the Bhabha process at flavour factories. The theoretical accuracy of the
improved generator is conservatively estimated to be 0.2%, by comparison with
independent calculations. The generator is a useful tool for precise luminosity
determination at flavour factories, for center of mass energies below 10 GeV.


title:
Connecting Leptogenesis to CP Violation in Neutrino Mixings in a
  Tri-bimaximal Mixing model

abstract:
  We show that in a recently proposed $S_3$ model for tri-bimaximal mixing
pattern for neutrinos, CP violating phases in neutrino mixings are directly
responsible for lepton asymmetry $\epsilon_\ell$. In the exact tri-bimaximal
limit, $\epsilon_\ell$ is proportional to one of the Majorana phases whereas in
the presence of small deviations from tri-bimaximal pattern, there are two
contributions, one being proportional to the Dirac phase and the other to one
of the two Majorana phases. In the second case, $\theta_{13}$ is nonzero and
correlated with the deviation from maximal atmospheric mixing.


title: Properties of the Quark Gluon Plasma: A lattice perspective

abstract:
  We discuss results from lattice calculations for a few observables that are
sensitive to different length scales in the high temperature phase of QCD and
can give insight into its non-perturbative structure. We compare lattice
results with perturbative calculations at high temperature obtained for
vanishing and non-vanishing quark chemical potential.


title: Spacetime foam at a TeV

abstract:
  Motivated by recent interest in TeV-scale gravity and especially by the
possibility of fast baryon decay mediated by virtual black holes, we study
another dangerous aspect of spacetime foam interactions: lepton flavor
violation. We correlate existing limits on gravity-induced decoherence in the
neutrino sector with a lower bound on the scale of quantum gravity, and find
that if spacetime foam interactions do not allow an S-matrix description the UV
cutoff is well beyond the electroweak scale. This suggests that string theory
provides the appropriate framework for description of quantum gravity at the
TeV-scale.


title: Baryon Triality and Neutrino Masses from an Anomalous Flavor U(1)

abstract:
  We construct a concise U(1)_X Froggatt-Nielsen model in which baryon
triality, a discrete gauge Z_3 symmetry, arises from U(1)_X breaking. The
proton is thus stable, however, R-parity is violated. With the proper choice of
U(1)_X charges we can obtain neutrino masses and mixings consistent with an
explanation of the atmospheric and solar neutrino anomalies in terms of
neutrino oscillations, with no right-handed neutrinos required. The only mass
scale apart from M_grav is m_3/2 ~ m_soft.


title:
Time variation of proton-electron mass ratio and fine structure constant
  with runaway dilaton

abstract:
  Recent astrophysical observations indicate that the proton-electron mass
ratio and the fine structure constant have gone through nontrivial time
evolution. We discuss their time variation in the context of a dilaton runaway
scenario with gauge coupling unification at the string scale $M_{\rm s}$. We
show that the choice of adjustable parameters allows them to fit the same order
magnitude of both variations and their (opposite) signs in such a scenario.


title:
Numerical integration of one-loop Feynman diagrams for N-photon
  amplitudes

abstract:
  In the calculation of cross sections for infrared-safe observables in high
energy collisions at next-to-leading order, one approach is to perform all of
the integrations, including the virtual loop integration numerically. One would
use a subtraction scheme that removes infrared and collinear divergences from
the integrand in a style similar to that used for real emission graphs. Then
one would perform the loop integration by Monte Carlo integration along with
the integrations over final state momenta. In this paper, we have explored how
one can perform the numerical integration. We have studied the N-photon
scattering amplitude with a massless electron loop in order to have a case with
a singular integrand that is not, however, so singular as to require the
subtractions. We report results for N = 4, N = 5 with left-handed couplings,
and N=6.


title:
Positive and negative-parity flavor-octet baryons in coupled QCD sum
  rules

abstract:
  We apply the method of the QCD sum rule, in which positive- and
negative-parity baryons couple with each other, to the flavor-octet hyperons
and investigate the parity splittings. We also reexamine the nucleon in the
method, which was studied in our previous paper, by carefully choosing the
Borel weight. Both in the nucleon and hyperon channels the obtained sum rules
turn out to have a very good Borel stability and also have a Borel window, an
energy region in which the OPE converges and the pole contribution dominates
over the continuum contribution. The predicted masses of the positive- and
negative-parity baryons reproduce the experimental ones fairly well in the
$\Lambda$ and $\Sigma$ channels, if we assign the $\Lambda(1670)$ and the
$\Sigma(1620)$ to the parity partners of the $\Lambda$ and the $\Sigma$,
respectively. This implies that the $\Lambda(1405)$ is not the party partner of
the $\Lambda$ and may be a flavor-singlet or exotic state. In the $\Xi$
channel, the sum rule predicts the mass of the negative-parity state to be
about 1.8 GeV, which leads to two possibilities; one is that the observed state
with the closest mass, $\Xi(1690)$, is the parity partner and the other is that
the parity partner is not yet found but exists around 1.8 GeV.


title:
Static properties and semileptonic decays of doubly heavy baryons in a
  nonrelativistic quark model

abstract:
  We evaluate static properties and semileptonic decays for the ground state of
doubly heavy $\Xi, \Xi', \Xi^*$ and $\Omega, \Omega', \Omega^*$ baryons.
Working in the framework of a nonrelativistic quark model, we solve the
three--body problem by means of a variational ansazt made possible by heavy
quark spin symmetry constraints. To check the dependence of our results on the
inter-quark interaction we use five different quark-quark potentials that
include a confining term plus Coulomb and hyperfine terms coming from
one--gluon exchange. Our results for static properties (masses, charge and mass
radii, magnetic moments...) are, with a few exceptions for the magnetic
moments, in good agreement with a previous Faddeev calculation. Our much
simpler wave functions are used to evaluate semileptonic decays of doubly heavy
$\Xi,\Xi'(J=1/2)$ and $\Omega, \Omega'(J=1/2)$ baryons. Our results for the
decay widths are in good agreement with calculations done within a relativistic
quark model in the quark--diquark approximation.


title:
Crossover, Fluctuations and Anderson Transition in Quark Matter
  Formation

abstract:
  We argue that there is a unique transition state of moderate density between
the nuclear matter and superconducting quark matter alternatives. The
distinguishing features of this state are discussed.


title: Search for New Physics in Rare D Decays

abstract:
  In many extensions of the standard model an additional up-like heavy quark
appears. Its appearance induces flavour changing neutral current transition in
the up-quark region at the tree level. We investigate possible effects of these
models in the c->u l+ l- transitions. First we determine impact of new physics
on the relevant Wilson coefficients and then we reevaluate the standard model
long-distance contributions. We calculate differential branching ratio for the
D+ -> pi+ l+ l- and D0 -> rho0 l+ l- decays. Among all D decay modes these two
are the simplest ones for the experimental studies. We also determine the
forward-backward asymmetry for the D0 -> rho0 l+ l- decay and we comment on the
effects of the Littlest Higgs model in both decay modes.


title:
Two-loop electroweak corrections to Higgs production in proton-proton
  collisions

abstract:
  We study the impact of the two-loop electroweak corrections on the production
of a Higgs boson via gluon-fusion in proton-proton collisions at LHC energies.
We discuss the prescritpion to include the corrections to the hard scattering
matrix element in the calculation of the hadronic cross-section sigma (p+p\to
H+X). Under the hypothesis of factorization of the electroweak corrections with
respect to the dominant soft and collinear QCD radiation, we observe an
increase of the total cross-section from 4 to 8 %, for MH <=160 GeV. This
increase is comparable with the present QCD uncertainties originating from hard
scattering matrix elements.


title:
On Unification and Nucleon Decay in Supersymmetric Grand Unified
  Theories Based on SU(5)

abstract:
  We investigate the unification constraints in the minimal sypersymmetric
grand unified theories based on SU(5) gauge symmetry. The most general
constraints on the spectrum of minimal supersymmetric SU(5) and flipped SU(5)
are shown. The upper bound on the mass of the colored Higgs mediating proton
decay is discussed in detail in the context of the minimal supersymmetric
SU(5). In the case of the minimal SUSY SU(5) we show that if we stick to the
strongest bound on the colored triplet mass coming from dimension five proton
decay contributions there is no hope to test this model at future nucleon decay
experiments through the dimension six operators. We find a lower bound on the
partial proton decay lifetime for all relevant channels in the context of
flipped SUSY SU(5). We conclude that flipped SUSY SU(5) might be in trouble if
proton decay is found at the next generation of experiments with a lifetime
below 10^{37} years.


title: Modelling non-perturbative corrections to bottom-quark fragmentation

abstract:
  We describe B-hadron production in e+e- annihilation at the Z pole by means
of a model including non-perturbative corrections to b-quark fragmentation as
originating, via multiple soft emissions, from an effective QCD coupling
constant, which does not exhibit the Landau pole any longer and includes
absorbitive effects due to parton branching. We work in the framework of
perturbative fragmentation functions at NLO, with NLL DGLAP evolution and NNLL
large-x resummation in both coefficient function and initial condition of the
perturbative fragmentation function. We include hadronization corrections via
the effective coupling constant in the NNLO approximation and do not add any
further non-perturbative fragmentation function. As part of our model, we
perform the Mellin transforms of our resummed expressions exactly. We present
results on the energy distribution of b-flavoured hadrons, which we compare
with LEP and SLD data, in both x- and N-spaces. We find that, within the
theoretical uncertainties on our calculation, our model is able to reasonably
reproduce the data at x<0.92 and the first five moments of the B cross section.


title:
Non equilibrium dynamics of mixing, oscillations and equilibration: a
  model study

abstract:
  The non-equilibrium dynamics of mixing, oscillations and equilibration is
studied in a field theory of flavored neutral mesons that effectively models
two flavors of mixed neutrinos, in interaction with other mesons that represent
a thermal bath of hadrons or quarks and charged leptons. This model describes
the general features of neutrino mixing and relaxation via charged currents in
a medium. The reduced density matrix and the non-equilibrium effective action
that describes the propagation of neutrinos is obtained by integrating out the
bath degrees of freedom. We obtain the dispersion relations, mixing angles and
relaxation rates of ``neutrino'' quasiparticles. The dispersion relations and
mixing angles are of the same form as those of neutrinos in the medium, and the
relaxation rates are given by $\Gamma_1(k) = \Gamma_{ee}(k)
\cos^2\theta_m(k)+\Gamma_{\mu\mu}(k)\sin^2\theta_m(k)
  ; \Gamma_2(k)= \Gamma_{\mu\mu}(k)
\cos^2\theta_m(k)+\Gamma_{ee}(k)\sin^2\theta_m(k) $ where
$\Gamma_{\alpha\alpha}(k)$ are the relaxation rates of the flavor fields in
\emph{absence} of mixing, and $\theta_m(k)$ is the mixing angle in the medium.
A Weisskopf-Wigner approximation that describes the asymptotic time evolution
in terms of a non-hermitian Hamiltonian is derived. At long time
$>>\Gamma^{-1}_{1,2}$ ``neutrinos'' equilibrate with the bath. The equilibrium
density matrix is nearly diagonal in the basis of eigenstates of an
\emph{effective Hamiltonian that includes self-energy corrections in the
medium}. The equilibration of ``sterile neutrinos'' via active-sterile mixing
is discussed.


title: Lower Bounds on Delta M_{s,d} from Constrained Minimal Flavour Violation

abstract:
  We demonstrate that in the class of models with Constrained Minimal Flavour
Violation (CMFV), in which the CKM matrix is the only source of CP violation
and B^0_q-\bar B^0_q mixings (q=d,s) are described by a single operator (\bar b
q)_{V-A} (\bar b q)_{V-A}, the lower bounds on the mass differences Delta
M_{s,d} are simply given by their Standard Model values (Delta M_{s,d})_SM with
two possible exceptions that we identify. Our proof involves all possible
charged gauge boson, Goldstone boson and physical charged and neutral scalar
exchanges and assumes that the masses of new charge +2/3 singlet heavy fermions
T_i that mix with the top quark have all to be larger than m_t, which is chosen
by nature. Similarly, the additional charged gauge bosons have to satisfy
M_i>M_W, while no such bound needs to be set on the charged and neutral scalar
masses. The two possible exceptions arise in the presence of U(1) neutral gauge
bosons and Majorana fermions in box diagrams with flavour violating couplings.
However in the case of the MSSM with CMFV and low tan beta our bound is
satisfied in spite of gluino and neutralino contributions.


title: LHC String Phenomenology

abstract:
  We argue that it is possible to address the deeper LHC Inverse Problem, to
gain insight into the underlying theory from LHC signatures of new physics. We
propose a technique which may allow us to distinguish among, and favor or
disfavor, various classes of underlying theoretical constructions using
(assumed) new physics signals at the LHC. We think that this can be done with
limited data $(5-10 fb^{-1})$, and improved with more data. This is because of
two reasons -- a) it is possible in many cases to reliably go from
(semi)realistic microscopic string construction to the space of experimental
observables, say, LHC signatures. b) The patterns of signatures at the LHC are
sensitive to the structure of the underlying theoretical constructions. We
illustrate our approach by analyzing two promising classes of string
compactifications along with six other string-motivated constructions. Even
though these constructions are not complete, they illustrate the point we want
to emphasize. We think that using this technique effectively over time can
eventually help us to meaningfully connect experimental data to microscopic
theory.


title:
New Physics contributions to the lifetime difference in D0-anti-D0
  mixing

abstract:
  The first general analysis of New Physics contributions to the D0-anti-D0
lifetime difference (equivalently Delta Gamma_D} is presented. The extent to
which New Physics (NP) contributions to |Delta C|=1 processes can produce
effects in Delta Gamma_D, even if such NP contributions are undetectable in the
current round of D0 decay experiments, is studied. New Physics models which do
and do not dominate the lifetime difference in the flavor SU(3) limit are
identified. Specific examples are provided.


title: Gluon mass generation in the PT-BFM scheme

abstract:
  In this article we study the general structure and special properties of the
Schwinger-Dyson equation for the gluon propagator constructed with the pinch
technique, together with the question of how to obtain infrared finite
solutions, associated with the generation of an effective gluon mass.
Exploiting the known all-order correspondence between the pinch technique and
the background field method, we demonstrate that, contrary to the standard
formulation, the non-perturbative gluon self-energy is transverse
order-by-order in the dressed loop expansion, and separately for gluonic and
ghost contributions. We next present a comprehensive review of several subtle
issues relevant to the search of infrared finite solutions, paying particular
attention to the role of the seagull graph in enforcing transversality, the
necessity of introducing massless poles in the three-gluon vertex, and the
incorporation of the correct renormalization group properties. In addition, we
present a method for regulating the seagull-type contributions based on
dimensional regularization; its applicability depends crucially on the
asymptotic behavior of the solutions in the deep ultraviolet, and in particular
on the anomalous dimension of the dynamically generated gluon mass. A
linearized version of the truncated Schwinger-Dyson equation is derived, using
a vertex that satisfies the required Ward identity and contains massless poles
belonging to different Lorentz structures. The resulting integral equation is
then solved numerically, the infrared and ultraviolet properties of the
obtained solutions are examined in detail, and the allowed range for the
effective gluon mass is determined. Various open questions and possible
connections with different approaches in the literature are discussed.


title: Dipole description of inclusive particle production

abstract:
  The effects of multiple interactions in colliding particles (e.g. in
nucleus-nucleus collisions) are modeled using the light-cone dipole approach.
Guided by the abelian analogue of multi-photon interactions in the production
of a pair of charged particles, we relate the inclusive cross section of quark
pair production with the cross sections of interaction of a QCD dipole with
either the beam or the target.


title:
Electroproduction of two light vector mesons in next-to-leading BFKL:
  study of systematic effects

abstract:
  The forward electroproduction of two light vector mesons is the first example
of a collision process between strongly interacting colorless particles for
which the amplitude can be written completely within perturbative QCD in the
Regge limit with next-to-leading accuracy. In a previous paper we have given a
numerical determination of the amplitude in the case of equal photon
virtualities by using a definite representation for the amplitude and a
definite optimization method for the perturbative series. Here we estimate the
systematic uncertainty of our previous determination, by considering a
different representation of the amplitude and different optimization methods of
the perturbative series. Moreover, we compare our result for the differential
cross section at the minimum momentum transfer with a different approach, based
on collinear kernel improvement.


title: Experimental moments of the nucleon structure function F2

abstract:
  Experimental data on the F2 structure functions of the proton and deuteron,
including recent results from CLAS at Jefferson Lab, have been used to
construct their n<=12 moments. A comprehensive analysis of the moments in terms
of the operator product expansion has been performed to separate the moments
into leading and higher twist contributions. Particular attention was paid to
the issue of nuclear corrections in the deuteron, when extracting the neutron
moments from data. The difference between the proton and neutron moments was
compared directly with lattice QCD simulations. Combining leading twist moments
of the neutron and proton we found the d/u ratio at x->1 approaching 0,
although the precision of the data did not allow to exclude the 1/5 value. The
higher twist components of the proton and neutron moments suggest that
multi-parton correlations are isospin independent.


title:
Spin effects in rare $B \to X_s \tau^+ \tau^-$ and $B \to K^{(*)} \tau^+
  \tau^-$ decays in a single Universal Extra Dimension scenario

abstract:
  We study the branching fractions and the lepton polarization asymmetries of
rare $B \to X_s \tau^+ \tau^-$ and $B \to K^{(*)} \tau^+ \tau^-$ modes within
the Standard Model and in the Appelquist-Cheng-Dobrescu model, which is a New
Physics scenario with a single universal extra dimension. In particular, we
investigate the sensitivity of the observables to the radius $R$ of the
compactified extra-dimension, which is the only new parameter in this New
Physics model. For the exclusive transitions we study the uncertainties due to
the hadronic matrix elements using two set of form factors, finding that in
many cases such uncertainties are small. In particular, we show that the
$\tau^-$ polarization asymmetries become free of hadronic uncertainties if
Large Energy relations for the form factors, valid for low momentum transfer to
the lepton pair, are used. We also consider $K^*$ helicity fractions and their
sensitivity to the compactification parameter.


title: Energy Conservation and Pomeron Loops in High Energy Evolution

abstract:
  We present a formalism which modifies the Mueller Dipole Model such that it
incorporates energy-momentum conservation and also important colour suppressed
effects. We implement our formalism in a Monte Carlo simulation and compare the
results to inclusive data from HERA and the Tevatron, where we see that there
is a good agreement between the data and our model.


title:
Proposal for testing lepton universality in Upsilon decays at a
  B-factory running at $\Upsilon(3S)$

abstract:
  We present a proposal for detecting new physics at a B-factory running at the
$\Upsilon(3S)$ resonance by testing lepton universality to the few percent
level in the leptonic decays of the $\Upsilon(1S)$ and $\Upsilon(2S)$
resonances tagged by the dipion in the chain decay: $\Upsilon(3S) \to
pi^+\pi^-\Upsilon(1S,2S)$; $\Upsilon(1S,2S) \to \ell^+\ell^-$,
$\ell=e,\mu,\tau$.


title: Evolution of Mixed Particles Interacting with Classical Sources

abstract:
  We study the systems of scalar and spinor particles with mixing emitted by
external classical sources. The particles wave functions exactly accounting for
external sources are obtained directly from the Lorentz invariant wave
equations in (3+1)-dimensional space-time. Then we discuss sources which are
localized in space and emit harmonic radiation. We obtain that the considered
scalar and spinor fields can be converted from one type to another due to the
presence of the vacuum mixing. This phenomenon is shown to be analogous to
neutrino flavor oscillations in vacuum since the calculated transition and
survival probabilities coincide with the corresponding expressions for neutrino
oscillations. When we discuss the evolution of spinor particles, the situation
of general mass matrix, which has both Dirac and Majorana mass terms, is
studied. In this case we analyze the appearance of antiparticles in the initial
particles beam. The relevance of the developed technique to the description of
neutrino flavor oscillations is examined.


title: Probing the Earth's interior with the LENA detector

abstract:
  A future large-volume liquid scintillator detector such as the proposed 50
kton LENA (Low Energy Neutrino Astronomy) detector would provide a
high-statistics measurement of terrestrial antineutrinos originating from
$\beta$-decays of the uranium and thorium chains. Additionally, the neutron is
scattered in the forward direction in the detection reaction $\bar\nu_e+p\to
n+e^+$. Henceforth, we investigate to what extent LENA can distinguish between
certain geophysical models on the basis of the angular dependence of the
geoneutrino flux. Our analysis is based on a Monte-Carlo simulation with
different levels of light yield, considering an unloaded PXE scintillator. We
find that LENA is able to detect deviations from isotropy of the geoneutrino
flux with high significance. However, if only the directional information is
used, the time required to distinguish between different geophysical models is
of the order of severals decades. Nonetheless, a high-statistics measurement of
the total geoneutrino flux and its spectrum still provides an extremely useful
glance at the Earth's interior.


title: Deeply virtual electro-production of vector mesons and spin effects

abstract:
  We study light vector meson photoproduction at small $x$ on the basis of the
generalized parton distribution (GPD). Our results on the cross section and
spin density matrix elements (SDME) are in fair agreement with DESY experiments


title: Predictions of an A_4 model with a five-parameter neutrino mass matrix

abstract:
  We consider a model with an A_4 flavour symmetry, recently proposed by E. Ma,
and make a numerical study, through scatter plots, of its neutrino mass matrix.


title:
Chiral-Odd Generalized Parton Distributions and Transversity in
  Light-Front Constituent Quark Models

abstract:
  We present the general framework to calculate chiral-odd generalized parton
distributions in the overlap representation using the Fock-state decomposition
in the transverse spin basis. In the forward limit we derive the transversity
distribution, the tensor charge and the angular momentum sum rule for quarks
with transverse polarization in an unpolarized nucleon. Numerical results are
obtained by applying the formalism to the case of light-cone wavefunctions of
constituent quark models.


title: Strong one-pion decay of $\Sigma_c$, $\Sigma_c^*$ and $\Xi_c^*$

abstract:
  Working in the framework of a nonrelativistic quark model we evaluate the
widths for the strong one-pion decays $\Sigma_c\to\Lambda_c \pi$,
$\Sigma_c^*\to\Lambda_c \pi$ and $\Xi_c^{*}\to\Xi_c \pi$. We take advantage of
the constraints imposed by heavy quark symmetry to solve the three-body problem
by means of a simple variational ansatz. We use partial conservation of the
axial current hypothesis to get the strong vertices from weak axial current
matrix elements. Our results are in good agreement with experimental data.


title: Can we learn something more on oscillations from atmospheric neutrinos?

abstract:
  We show that for long-baseline experiments using a Mt water Cerenkov detector
atmospheric neutrino data provide a powerful method to resolve parameter
degeneracies. In particular, the combination of long-baseline and atmospheric
data increases significantly the sensitivity to the neutrino mass hierarchy and
the octant of $\theta_{23}$. Furthermore, we discuss the possibility to use
$\mu$-like atmospheric neutrino data from a big magnetized iron calorimeter to
determine the neutrino mass hierarchy.