title: Couplings of the eta and eta' Mesons to the Nucleon

abstract:
  The couplings of the eta and eta' mesons to the nucleon are obtained from the
U_A(1) Goldberger-Treiman relation. The chiral symmetry breaking corrections
are very large and bring the calculated values of the coupling constants
G_etaNN and G_eta'NN close to values obtained from potential models.


title: Improving QCD Perturbative Predictions and Transverse Momentum Effects

abstract:
  I elaborate on the implementation of analyticity of hadronic quantities at
the amplitude level and show that it amounts to the extension of Analytic
Perturbation Theory of Shirkov and Solovtsov to non-integer (fractional) powers
of the strong running coupling. I give evidence that at the NLO of the
factorized pion's electromagnetic form factor this framework diminishes the
uncertainty due to the renormalization-scheme choice and nearly removes the
dependence on both the renormalization and the factorization scale. I
supplement this discussion by considering effects caused by retaining
transverse momenta that give rise to Sudakov factors.


title:
Studying the effects of minimal length in large extra dimensional models
  in the jet + missing energy channels at hadron colliders

abstract:
  Theories of quantum gravity suggest the existence of a minimal length scale.
We study the consequences of a particular implementation of the idea of a
minimal length scale in the model of large extra dimensions, the ADD model. To
do this we have looked at real graviton production in association with a jet at
hadron colliders. In the minimal length scenario, the bounds on the effective
string scale are significantly less stringent than those derived in the
conventional ADD model, both at the upgraded Tevatron and at the Large Hadron
Collider.


title: Spin Filtering in Storage Rings

abstract:
  The spin filtering in storage rings is based on the multiple passage of a
stored beam through a polarized internal gas target. Apart from the
polarization by transmission, a unique geometrical feature of interaction with
the target in such a filtering process, pointed out by H.O. Meyer \cite{Meyer},
is a scattering of stored particles within the beam. A rotation of the spin in
the scattering process affects the polarization buildup. We derive here a
quantum-mechanical evolution equation for the spin-density matrix of the stored
beam which incorporates scattering within the beam. We show how the interplay
of transmission and scattering with the beam changes from polarized electrons
to polarized protons in the atomic target. After discussions of the FILTEX
results on the filtering of stored protons \cite{FILTEX}, we comment on the
strategy of spin filtering of antiprotons for the PAX experiment at GSI FAIR
\cite{PAX-TP}.


title: On Higgs and sphaleron effects during the leptogenesis era

abstract:
  We discuss the effects of various processes that can be active during the
leptogenesis era, and present the Boltzmann equations that take them into
account appropriately. A non-vanishing Higgs number asymmetry is always
present, enhancing the washout of the lepton asymmetry. This is the main new
effect when leptogenesis takes place at $T>10^{12}$ GeV, reducing the final
baryon asymmetry and tightening the leptogenesis bound on the neutrino masses.
If leptogenesis occurs at lower temperatures, electroweak sphalerons partially
transfer the lepton asymmetry to a baryonic one, while Yukawa interactions and
QCD sphalerons partially transfer the asymmetries of the left-handed fields to
the right-handed ones, suppressing the washout processes. Depending on the
specific temperature range in which leptogenesis occurs, the final baryon
asymmetry can be enhanced or suppressed by factors of order 20%--40% with
respect to the case when these effects are altogether ignored.


title: Top Quark Properties in Little Higgs Models

abstract:
  We study the shifts in the gauge couplings of the top quark induced in the
Littlest Higgs model with and without T parity. We find that the ILC will be
able to observe the shifts throughout the natural range of model parameters.


title: Low energy properties of color-flavor locked superconductors

abstract:
  We discuss some low energy properties of color-flavor locked (CFL)
superconductors. First, we study how an external magnetic field affects their
Goldstone physics in the chiral limit, stressing that there is a long-range
component of the field that penetrates the superconductor. We note that the
most remarkable effect of the applied field is giving a mass to the charged
pions and kaons. By estimating this effect, we see that for values $e B \sim 2
f_\pi \Delta$, where $\Delta$ is the quark gap, and $f_\pi$ the pion decay
constant, the charged Goldstone bosons become so heavy, that they turn out to
be unstable. The symmetry breaking pattern is then changed, agreeing with that
of the magnetic color-flavor locked (MCFL) phase, recently proposed in
hep-ph/0503162. Finally, we discuss the physics of the superfluid phonon of the
CFL phase, compare it with that of the phonon of a Bose-Einstein condensate,
and discuss transport phenomena at low temperature. Astrophysical implications
of all the above low energy properties are also commented.


title: Detecting an invisible Higgs boson at Fermilab Tevatron and CERN LHC

abstract:
  In this paper, we study the observability of an invisible Higgs boson at
Fermilab Tevatron and CERN LHC through the production channel $ q \bar{q} \to Z
H \to \ell^+\ell^-+ \ptmiss $, where $\ptmiss$ is reconstructed from the
$\ell^+\ell^-$ with $\ell=e$ or $\mu$. A new strategy is proposed to eliminate
the largest irreducible background, namely $ q \bar{q} \to Z(\to \ell^+\ell^-)
Z(\to \nu \bar\nu)$. This strategy utilizes the precise measurements of $ q
\bar{q} \to Z(\to \ell^+\ell^-) Z(\to \ell^+\ell^-)$. For $m_H=120$ GeV and
with luminosity $30 fb^{-1}$ at Tevatron, a $5\sigma$ observation of the
invisible Higgs boson is possible. For $m_H=114 \sim 140$ GeV with only $10
fb^{-1}$ luminosity at LHC, a discovery signal over $5\sigma$ can be achieved.


title:
Zero Modes in Electromagnetic Form Factors of the Nucleon in a
  Light-Cone Diquark Model

abstract:
  We use a diquark model of the nucleon to calculate the electromagnetic form
factors of the nucleon described as a scalar and axialvector diquark bound
state. We provide an analysis of the zero-mode contribution in the diquark
model. We find there are zero-mode contributions to the form factors arising
from the instantaneous part of the quark propagator, which cannot be neglected
compared with the valence contribution but can be removed by the choice of wave
function. We also find that the charge and magnetic radii and magnetic moment
of the proton can be reproduced, while the magnetic moment of the neutron is
too small. The dipole shape of the form factors, $G^p_M(Q^2)/\mu_p$ and
$G^n_M(Q^2)/\mu_n,$ can be reproduced. The ratio $\mu G^p_E/G^p_M$ decreases
with $Q^2,$ but too fast.


title:
Conformal invariant pomeron interaction in the perurbative QCD with
  large N_c

abstract:
  An effective non-local quantum field theory is constructed, which describes
interaction of pomerons in the high-coloured QCD. The theory includes both
splitting and merging triple pomeron vertexes and diagrams with pomeronic
loops. The Schwinger-Dyson equations for the 'physical' pomeron are written.
Conformal invariance allows to reduce the theory to the old-fashioned Gribov
pomeron theory with an infinite number of pomerons, one of which is
supercritical.


title: Four-Loop Decoupling Relations for the Strong Coupling

abstract:
  We compute the matching relation for the strong coupling constant within the
framework of QCD up to four-loop order. This allows a consistent five-loop
running (once the $\beta$ function is available to this order) taking into
account threshold effects. As a side product we obtain the effective coupling
of a Higgs boson to gluons with five-loop accuracy.


title:
Electroweak Penguin Hunting Through B -> pi pi, pi K and Rare K and B
  Decays

abstract:
  The $B\to\pi K$ decays with significant electroweak penguin contributions
show a puzzling pattern. We explore this "$B\to\pi K$ puzzle" through a
systematic strategy. The starting point, which is essentially unaffected by
electroweak penguins, is the determination of the angle $\gamma$ of the
unitarity triangle through the CP-violating $B^0_d\to\pi^+\pi^-$,
$B^0_d\to\pi^-K^+$ asymmetries, yielding $\gamma=(73.9^{+5.8}_{-6.5})^\circ$,
and the extraction of hadronic parameters through the measured $B\to\pi\pi$
branching ratios. Using arguments related to the SU(3) flavour symmetry, we
convert the hadronic $B\to\pi\pi$ parameters into their $B\to\pi K$
counterparts, allowing us to predict the $B\to\pi K$ observables in the
Standard Model. We find agreement with the data for those quantities that are
only marginally affected by electroweak penguins, while this is not the case
for the observables with sizeable electroweak penguin contributions. Since we
may also perform a couple of internal consistency checks of our working
assumptions, which are nicely satisfied for the current data, and find a small
sensitivity of our results to large non-factorizable SU(3)-breaking
corrections, the "$B\to\pi K$" puzzle may be due to new physics in the
electroweak penguin sector. We show that it can indeed be resolved through such
a kind of new physics with a large CP-violating phase. Further insights into
the electroweak penguins are provided by the $B^+\to\pi^0K^+$ and
$B_d^0\to\pi^0K_{\rm S}$ CP asymmetries, and in particular through correlations
with various rare $K$ and B decays.


title: QCD Decoupling at Four Loops

abstract:
  We present the matching condition for the strong coupling contant alpha_s at
a heavy quark threshold to four loops in the modified minimal subtraction
scheme. Our results lead to further decrease of the theoretical uncertainty of
the evolution of the strong coupling constant through heavy quark thresholds.
Using a low energy theorem we furthermore derive the effective coupling of the
Higgs boson to gluons (induced by a virtual heavy quark) in four- and
(partially) through five-loop approximation.


title:
Proceedings to the 8th Workshop 'What Comes Beyond the Standard Models',
  Bled, July 19. - 29., 2005, Slovenia

abstract:
  Contents: 1. Can MPP Together with Weinberg-Salam Higgs Provide Cosmological
Inflation? (D.L. Bennett and H.B. Nielsen) 2. Conserved Charges in 3d Gravity
With Torsion (M. Blagojevic and B. Cvetkovic) 3. Mass Matrices of Quarks and
Leptons in the Approach Unifying Spins and Charges (A. Borstnik Bracic and N.S.
Mankoc Borstnik) 4. Dark Matter From Encapsulated Atoms (C.D. Froggatt and H.B.
Nielsen) 5. Dirac Sea for Bosons Also and SUSY for Single Particles (Y. Habara,
H.B. Nielsen and M. Ninomiya) 6. Searching for Boundary Conditions in
Kaluza-Klein-like Theories (D. Lukman, N.S. Mankoc Borstnik and H. B. Nielsen)
7. Second Quantization of Spinors and Clifford Algebra Objects (N.S. Mankoc
Borstnik and H. B. Nielsen) 8. Are there Interesting Problems That Could
Increase Understanding of Physics and Mathematics? (R. Mirman) 9.
Noncommutative Nonsingular Black Holes (P. Nicolini) 10. Compactified Time and
Likely Entropy -- World Inside Time Machine: Closed Time-like Curve (H.B.
Nielsen and M. Ninomiya) + Astri Kleppe's Song.


title: On the origin of families of fermions and their mass matrices

abstract:
  We are proposing a new way of describing families of quarks and leptons,
using the approach unifying all the internal degrees of freedom, proposed by
one of us. Spinors, living in d(=1+13)-dimensional space, carry in this
approach only the spin and interact with only the gravity through vielbeins and
two kinds of the spin connection fields - the gauge fields of the Poincare
group and the second kind of the Clifford algebra objects. All the quarks and
the leptons of one family appear in one Weyl representation of a chosen
handedness of the Lorentz group, if analyzed with respect to the Standard model
gauge groups: the right handed (with respect to SO(1,3)) weak chargeless quarks
and leptons and the left handed weak charged quark and leptons. A part of the
starting Lagrange density of a Weyl spinor in d=1+13 transforms right handed
quarks and leptons into left handed quarks and leptons manifesting as the
Yukawa couplings of the Standard model. The second kind of Clifford algebra
objects generates families and contributes to diagonal and off diagonal Yukawa
couplings. The approach predicts an even number of families, treating leptons
and quarks equivalently. In this paper we investigate within this approach the
appearance of the Yukawa couplings within one family of quarks and leptons as
well as among the families (without assuming any Higgs fields). We present the
mass matrices for four families and investigate whether our way of generating
families might explain the origin of families of quarks and leptons as well as
their observed properties - the masses and the mixing matrices. Numerical
results are presented in the paper following this one.


title: TeV Mini Black Hole Decay at Future Colliders

abstract:
  It is generally believed that mini black holes decay by emitting elementary
particles with a black body energy spectrum. The original calculation lead to
the conclusion that about the 90% of the black hole mass is radiated away in
the form of photons, neutrinos and light leptons, mainly electrons and muons.
With the advent of String Theory, such a scenario must be updated by including
new effects coming from the stringy nature of particles and interactions.By
taking for granted that black holes can be produced in hadronic collisions,
then their decay must take into account that: (i) we live in a D3-Brane
embedded into an higher dimensional bulk spacetime; (ii) fundamental
interactions, including gravity, are unified at TeV energy scale. Thus, the
formal description of the Hawking radiation mechanism has to be extended to the
case of more than four spacetime dimensions and include the presence of
D-branes. Furthermore, unification of fundamental interactions at an energy
scale many order of magnitude lower than the Planck energy implies that any
kind of fundamental particle, not only leptons, is expected to be emitted. A
detailed understanding of the new scenario is instrumental for optimal tuning
of detectors at future colliders, where, hopefully, this exciting new physics
will be tested. In this article we review higher dimensional black hole decay,
considering not only the emission of particles according to Hawking mechanism,
but also their near horizon QED/QCD interactions. The ultimate motivation is to
build up a phenomenologically reliable scenario, allowing a clear experimental
signature of the event.


title: eta and eta' mesons and dimension 2 gluon condensate <A^2>

abstract:
  The study of light pseudoscalar quark-antiquark bound states in the
Dyson-Schwinger approach with the effective QCD coupling enhanced by the
interplay of the dimension 2 gluon condensate <A^2> and dimension 4 gluon
condensate <F^2>, is extended to the eta-eta' complex. We include the effects
of the gluon axial anomaly into the Dyson-Schwinger approach to mesons. The
calculated masses, mixing and two-photon decay widths of eta and eta' mesons
are in agreement with experiment. Also, in a model-independent way, we give the
modification of the Gell-Mann--Okubo and Schwinger nonet relations due to the
interplay of the gluon anomaly and SU(3) flavor symmetry breaking.


title: Supersymmetry with composite bosons

abstract:
  We note that hadronic susy (empirical quark-diquark) symmetry can be expanded
into the lepton sector, and that for three generations the counting of degrees
of freedom is the one we need to build charged supermultiplets. For this to
cure hierarchy, Higgs modeling becomes restricted.


title: Electromagnetic Logarithms in B -> X_s l+ l-

abstract:
  The B -> X_s l+ l- decay rate is known at the next-to-next-to-leading order
in QCD. It is proportional to alpha_em (mu)^2 and has a +- 4% scale uncertainty
before including the O(alpha_em log(M_W^2/m_b^2)) electromagnetic corrections.
We evaluate these corrections and confirm the earlier findings of Bobeth et al.
>. Furthermore, we complete the calculation of logarithmically enhanced
electromagnetic effects by including also QED corrections to the matrix
elements of four-fermion operators. Such corrections contain a collinear
logarithm log(m_b^2/m_l^2) that survives integration over the low dilepton
invariant mass region 1 GeV^2 < q^2 < 6 GeV^2 and enhances the integrated decay
rate in this domain. For the low-q^2 integrated branching ratio in the muonic
case, we find B (B -> X_s mu^+mu^-) = (1.59 +- 0.11) 10^(-6), where the error
includes the parametric and perturbative uncertainties only. For B (B -> X_s
e^+e^-), in the current BaBar and Belle setups, the logarithm of the lepton
mass gets replaced by angular cut parameters and the integrated branching ratio
for the electrons is expected to be close to that for the muons.


title: B -> X_s l+ l- in the Standard Model and in Two-Higgs-Doublet Models

abstract:
  We present recent results of the rare semileptonic decay B -> X_s l+ l-. We
particularly focus on higher order electroweak corrections in the Standard
Model (SM) as well as O(alpha_s) corrections in Two-Higgs-doublet models
(THDM), both of which are computed within an effective field theory approach.
  The calculation of higher order electroweak corrections reveals the presence
of enhanced electromagnetic logarithms log(m_b^2/m_l^2) in the differential
branching ratio. The inclusion of O(alpha_s) in the THDM reduces the scale
dependence of the corresponding Wilson coefficients significantly.


title: Phenomenological and Cosmological Aspects of a Minimal GUT Scenario

abstract:
  Several phenomenological and cosmological aspects of a minimal extension of
the Georgi-Glashow model, where the Higgs sector is composed by 5_H, 15_H, and
24_H, are studied. It is shown that the constraints coming from the unification
of gauge interactions up to two-loop level predict light scalar leptoquarks. In
this GUT scenario, the upper bound on the total proton decay lifetime is tau_p
< 1.4 x 10^36 years. The possibility to explain the matter-antimatter asymmetry
in the universe through the decays of SU(2)_L scalar triplets is also studied.
We find that a successful triplet seesaw leptogenesis implies an upper bound on
the scalar leptoquark mass, M_Phib < 10^{6-7} GeV. We conclude that this GUT
scenario can be tested at the next generation of proton decay experiments and
future colliders through the production of scalar leptoquarks.


title: Scale Optimisation and Event Shapes in Deep-Inelastic Scattering

abstract:
  We study the effect of optimising the renormalisation and factorisation
scales on perturbative calculations of event shape means defined in the Breit
frame of ep DIS. Unlike in the case of e^+e^- event shape means, this has only
a small effect on the NLO QCD predictions and a large power correction is still
required to fit the data. However, if separate renormalization scales are
introduced for the quark- and gluon-initiated sub-processes the optimisation
has a much larger effect and greatly reduces the size of the required power
corrections. Unfortunately, there are then problems fitting the low energy data
for some observables.


title: From HERA to the LHC

abstract:
  Some personal comments are given on some of the exciting interfaces between
the physics of HERA and the LHC. These include the quantitative understanding
of perturbative QCD, the possible emergence of saturation phenomena and the
Colour-Glass Condensate at small x and large Q^2, the link between forward
physics and ultra-high-energy cosmic rays, and new LHC opportunities opened up
by the discovery of rapidity-gap events at HERA, including the search for new
physics such as Higgs bosons in double-diffraction events.


title: Affleck-Dine baryogenesis and gravitino dark matter

abstract:
  Affleck-Dine baryogenesis in models where the gravitino is both the lightest
supersymmetric particle and the dark matter candidate is investigated. For a
high enough reheating temperature to produce sufficient gravitinos by thermal
processes, the observed baryon asymmetry can be explained by Affleck-Dine
baryogenesis as well as thermal leptogenesis. On the other hand, if the
reheating temperature is not high enough, most of the gravitinos must be
produced by the decay of the next-to-lightest supersymmetric particle (NSP).
Particularly, in the case where Q-balls cannot survive the evaporation, the
gravitino number density is given by the NSP's thermal relic density.
Interestingly, if Q-balls survive, they can be a source of gravitinos via the
NSP decay. Then, we could find a new cosmological interesting region in
parameter space because the gravitino number density does not relate to the
NSP's thermal relic density.


title: Phenomenological viability of string inspired multi-Higgs doublet models

abstract:
  We analyse the phenomenological viability of heterotic $Z_3$ orbifold models
with two Wilson lines, which naturally predict three families of matter and
Higgs fields. We study the orbifold parameter space, and discuss the
compatibility of the predicted Yukawa couplings with current experimental data,
thus evaluating the viability of the orbifold configurations. We address the
implications of tree-level flavour changing neutral processes in constraining
the Higgs sector of the model, finding that viable scenarios can be obtained
for a fairly light Higgs spectrum.


title: The Demise of Flavour Tagging and its Delta-T Dependence

abstract:
  In this work we discuss how the loss of particle-antiparticle identity due to
CPT violation affects the observables in the decay of two neutral
EPR-correlated $B$-mesons. We study this possible new effect in the context of
equal-sign flavour specific decays and we find a considerable modification in
the $\Delta t$-dependence of the equal-sign dilepton charge asymmetry,
$A_{sl}$. Although the more important changes occur right outside the $\Dt$
region that has been up-to-the-date effectively explored, we show that a deeper
experimental research may be able to distinguish a possible existence of this
new CPT violating parameter, $\w$. In any case, using the available data for
$A_{sl}$, we put the first limits on $\w$.


title: Anti-charmed pentaquark from B decays

abstract:
  We explore the possibility of observing the anti-charmed pentaquark state
from the $\Theta_c \bar{n} \pi^+$ decay of $B$ meson produced at $B$-factory
experiments. We first show that the observed branching ratio of the $B^+$ to $
\Lambda^-_c p \pi^+$, as well as its open histograms, can be remarkably well
explained by assuming that the decay proceeds first through the $\pi^+
\bar{D}^0$ (or $\bar{D}^{*0}$) decay, whose branching ratios are known, and
then through the subsequent decay of the virtual $\bar{D}^0$ or $\bar{D}^{*0}$
mesons to $\Lambda_c^- p$, whose strength are calculated using previously fit
hadronic parameters. We then note that the $\Theta_c$ can be similarly produced
when the virtual $\bar{D}^0$ or $\bar{D}^{*0}$ decay into an anti-nucleon and a
$\Theta_c$. Combining the present theoretical estimates for the ratio $g_{D N
\Lambda_c} / g_{D N \Theta_c} \sim 13 $ and $g_{D^* N \Theta_c} \sim {1/3} g_{D
N \Theta_c}$, we find that the anti-charmed pentaquark $\Theta_c$, which was
predicted to be bound by several model calculations, can be produced via $B^+
\to \Theta_c \bar{n} \pi^+$, and be observed from the $B$-factory experiments
through the weak decay of $\Theta_c \to p K^+ \pi^- \pi^- $.


title: Non-singlets in Semi-inclusive DIS and inclusive e+e- annihilation

abstract:
  We show that non-singlets in semi-inclusive DIS with pi^\pm determine without
assumptions Delta u_V, Delta d_V and D_u^{\pi+ - pi-}. Non-singlets in SIDIS
and inclusive e+e- -annihilation with K^\pm determine (s-bar s) and (Delta
s-Delta bar s), but an assumption is necessary -- we choose as most natural
D_d^{K+ - K-}=0.
  Measurements with charged K^\pm and neutral K0+bar K0 in semi-inclusive DIS
and e+e--annihilation determine
  D_{u,d,s}^{K+ + K-} without any assumptions and allow tests of LO
approximation in QCD.


title: Detecting dark energy in long baseline neutrino oscillations

abstract:
  In this paper, we discuss a possibility of studying properties of dark energy
in long baseline neutrino oscillation experiments. We consider two types of
models of neutrino dark energy. For one type of models the scalar field is
taken to be quintessence-like and for the other phantom-like. In these models
the scalar fields couple to the neutrinos to give rise to a spatially varying
neutrino masses. We will show that the two types of models predict different
behaviors of the spatial variation of the neutrino masses inside Earth and
consequently result in different signals in long baseline neutrino oscillation
experiments.


title: Multi-photon signatures at the Fermilab Tevatron

abstract:
  Fermiophobic Higgs bosons $h_f$ exhibiting large branching ratios to two
photons can arise in models with two or more scalar doublets and/or triplets.
In such models the conventional production mechanisms at hadron colliders may
be rendered ineffective due to severe mixing angle suppression. In this
scenario, double fermiophobic Higgs production may proceed via complementary
mechanisms leading to events with up to 4 photons. We perform a simulation of
the detection prospects of $h_f$ in the multi-photon (>3) channel at the
Fermilab Tevatron and show that a sizeable region of the ($m_{H^\pm},m_{h_f}$)
parameter space can be probed during Run II.


title: Higher Curvature Quantum Gravity and Large Extra Dimensions

abstract:
  We discuss effective interactions among brane matter induced by modifications
of higher dimensional Einstein gravity via the replacement of Einstein-Hilbert
term with a generic function f(R) of the curvature scalar R. After deriving the
graviton propagator, we analyze impact of virtual graviton exchanges on
particle interactions, and conclude that f(R) gravity effects are best probed
by high-energy processes involving massive gauge bosons, heavy fermions or the
Higgs boson. We perform a comparative analysis of the predictions of f(R)
gravity and of Arkani-Hamed-Dvali-Dimopoulos (ADD) scenario, and find that the
former competes with the latter when f''(0) is positive and comparable to the
fundamental scale of gravity in higher dimensions. In addition, we briefly
discuss graviton emission from the brane as well as its decays into
brane-localized matter, and find that they hardly compete with the ADD
expectations. Possible existence of higher-curvature gravitational interactions
in large extra spatial dimensions opens up various signatures to be confronted
with existing and future collider experiments.


title: Gluon propagation inside a high-energy nucleus

abstract:
  We show that, in the light-cone gauge, it is possible to derive in a very
simple way the solution of the classical Yang-Mills equations for the collision
between a nucleus and a proton. One important step of the calculation is the
derivation of a formula that describes the propagation of a gluon in the
background color field of the nucleus. This allows us to calculate observables
in pA collisions in a more straightforward fashion than already proposed. We
discuss also the comparison between light-cone gauge and covariant gauge in
view of further investigations involving higher order corrections.


title:
Minimal Walking Technicolour, the Top Mass and Precision Electroweak
  Measurements

abstract:
  We consider a minimal technicolour theory with two techniflavours in the
adjoint representation of an SU(2) technicolour gauge group which has been
argued to feature walking dynamics. We show how to naturally embed this theory
in an extended technicolour model capable of generating the top quark mass. We
investigate the precision constraints and conclude that such models, in the
light of the most recent precision data fit, are not ruled out.


title:
Low-Energy Supersymmetry Breaking from String Flux Compactifications:
  Benchmark Scenarios

abstract:
  Soft supersymmetry breaking terms were recently derived for type IIB string
flux compactifications with all moduli stabilised. Depending on the choice of
the discrete input parameters of the compactification such as fluxes and ranks
of hidden gauge groups, the string scale was found to have any value between
the TeV and GUT scales. We study the phenomenological implications of these
compactifications at low energy. Three realistic scenarios can be identified
depending on whether the Standard Model lies on D3 or D7 branes and on the
value of the string scale. For the MSSM on D7 branes and the string scale
between 10^12 GeV and 10^17 GeV we find that the LSP is a neutralino, while for
lower scales it is the stop. At the GUT scale the results of the fluxed MSSM
are reproduced, but now with all moduli stabilised. For the MSSM on D3 branes
we identify two realistic scenarios. The first one corresponds to an
intermediate string scale version of split supersymmetry. The second is a
stringy mSUGRA scenario. This requires tuning of the flux parameters to obtain
the GUT scale. Phenomenological constraints from dark matter, (g-2)_mu and
BR(b->s gamma) are considered for the three scenarios. We provide benchmark
points with the MSSM spectrum, making the models suitable for a detailed
phenomenological analysis.


title: X & Y

abstract:
  The 4-quark interpretation of the recently discovered X(3872) and Y(4260)
resonances is briefly discussed.


title: On the structure of $D_{sJ}^*(2317)$ and $D_{sJ}(2460)$

abstract:
  We discuss the structure of the narrow mesons with charm and strangeness
$D_{sJ}^*(2317)$ and $D_{sJ}(2460)$, stressing the role of the radiative decay
modes in shedding light on the quark content of these states.
  We argue that present experimental data favour the interpretation of the two
states as ordinary $\bar c s$ mesons. We suggest the existence of resonances
with similar properties and well predicted masses in the $\bar b s$ sector.


title: Reconstructing Supersymmetry at ILC/LHC

abstract:
  Coherent analyses of experimental results from LHC and ILC will allow us to
draw a comprehensive and precise picture of the supersymmetric particle sector.
Based on this platform the fundamental supersymmetric theory can be
reconstructed at the high scale which is potentially close to the Planck scale.
This procedure will be reviewed for three characteristic examples: minimal
supergravity as the paradigm; a left-right symmetric extension incorporating
intermediate mass scales; and a specific realization of string effective
theories.


title:
Running coupling at finite temperature and chiral symmetry restoration
  in QCD

abstract:
  We analyze the running gauge coupling at finite temperature for QCD, using
the functional renormalization group. The running of the coupling is calculated
for all scales and temperatures. At finite temperature, the coupling is
governed by a fixed point of the 3-dimensional theory for scales smaller than
the corresponding temperature. The running coupling can drive the quark sector
to criticality, resulting in chiral symmetry breaking. Our results provide for
a quantitative determination of the phase boundary in the plane of temperature
and number of massless flavors. Using the experimental value of the coupling at
the tau mass scale as the only input parameter, we obtain, e.g., for N_f=3
massless flavors a critical temperature of T_cr ~ 148 MeV in good agreement
with lattice simulations.


title: Relation between Lepton Flavor Violating Processes

abstract:
  We demonstrate the existence of model independent one-to-one correspondence
relations between different lepton flavor violating processes (LFV). Applying
the criterion of naturalness, based on the idea of "custodial symmetry", we
show that all the LFV processes, independently of specific mechanisms behind
them, but with the same external leptons, have a priori comparable amplitudes
modulo their kinematics and involved form factors.


title: Condition for gapless color-antitriplet excitations in NJL models

abstract:
  We present an exact condition for the existence of gapless quasiparticle
excitations in NJL models of color superconducting quark matter with a
quark-quark interaction in the scalar color-antitriplet channel. The condition
can be represented by a rotated ellipse in the plane of mass and chemical
potential differences for the paired quark fields.


title: A Twin Higgs Model from Left-Right Symmetry

abstract:
  We present twin Higgs models based on the extension of the Standard Model to
left-right symmetry that protect the weak scale against radiative corrections
up to scales of order 5 TeV. In the ultra-violet the Higgs sector of these
theories respects an approximate global symmetry, in addition to the discrete
parity symmetry characteristic of left-right symmetric models. The Standard
Model Higgs field emerges as the pseudo-Goldstone boson associated with the
breaking of the global symmetry. The parity symmetry tightly constrains the
form of radiative corrections to the Higgs potential, allowing natural
electroweak breaking. The minimal model predicts a rich spectrum of exotic
particles that will be accessible to upcoming experiments, and which are
necessary for the cancellation of one-loop quadratic divergences. These include
right-handed gauge bosons with masses not to exceed a few TeV and a pair of
vector-like quarks with masses of order several hundred GeV.


title: On the Delta I = 1/2 Rule in Holographic QCD

abstract:
  We study the $\Delta I = 1/2$ rule for kaon decays and the $B_K$ parameter
for $K^0 - {\bar K}^0$ mixing in a dual 5-dimensional holographic QCD model. We
perform, in the chiral limit, computations of the relevant four-point
current-current correlators, which depend upon self-interactions among the 5D
bulk fields. Spontaneous chiral symmetry breaking ($\chi$SB) is realized
through boundary conditions on the bulk fields. Numerical results are analyzed
in comparison with QCD, chiral perturbation theory ($\chi$PT) and data, finding
reasonable agreement with the experimental values of the $g_8$ and $g_{27}$
parameters describing the $\Delta I =1/2,3/2$ decay channels.


title: Minimal Dark Matter

abstract:
  A few multiplets that can be added to the SM contain a lightest neutral
component which is automatically stable and provides allowed DM candidates with
a non-standard phenomenology. Thanks to coannihilations, a successful thermal
abundance is obtained for well defined DM masses. The best candidate seems to
be a SU(2)_L fermion quintuplet with mass 4.4 TeV, accompanied by a charged
partner 166 MeV heavier with life-time 1.8 cm, that manifests at colliders as
charged tracks disappearing in pi^\pm with 97.7% branching ratio. The cross
section for usual NC direct DM detection is sigma_SI = f^2 1.0 10^-43 cm^2
where f ~ 1 is a nucleon matrix element. We study prospects for CC direct
detection and for indirect detection.


title:
Monte Carlo simulation of the Sivers effect in high-energy proton-proton
  collisions

abstract:
  We present Monte Carlo simulations of the Sivers effect in the polarized
Drell-Yan $pp^\uparrow \to \mu^+ \mu^- X$ process at the center-of-mass energy
$\sqrt{s}=200$ GeV reachable at the Relativistic Heavy-Ion Collider (RHIC) of
BNL. We use two different parametrizations for the Sivers function, one deduced
from the analysis of Semi-Inclusive Deep-Inelastic Scattering (SIDIS) data at
much lower energies, and another one constrained by the RHIC data for the
$pp^\uparrow \to \pi X$ process at the same energy. For a given luminosity of
$10^{32}$ cm$^{-2}$ sec$^{-1}$, we explore the necessary conditions to reach a
statistical accuracy that allows to extract unambiguous information on the
structure of the Sivers function. In particular, we consider the feasibility of
the test on its predicted universality property of changing sign when switching
from SIDIS to Drell-Yan processes.


title:
Is there exist a hadron spin-flip contribution in the Coulomb-hadron
  interference at small transfer momenta and high energies

abstract:
  The analysing power $A_N$ is examined in the range of the Coulomb-hadron
interferenceon on the basis of the experimental data from p_L = 6 GeV/c up to
200 GeV/c taking account of a phenomenological analysis at p_L = 6 GeV/c and a
dynamic high-energy spin model. The results are compared with the new RHIC data
at p_L = 100 GeV/c. The new experimental data obtained at RHIC indicate the
small contributions of the hadrons spin-flip amplitude.


title: Correlated decays of pair-produced scalar taus

abstract:
  We study the quantum mechanical correlation between two identical neutralinos
in the decays of minimal supersymmetric standard model (MSSM) scalar tau (stau)
pair produced in e+e- annihilation. Generally, the decay products of scalar
(spinless) particles are not correlated. We show that a correlation between two
neutralinos appears near pair production threshold, due to a finite stau width
and mixing of the staus and/or neutralinos, and because the neutralinos are
Majorana. Because the correlation is significant only in a specific kinematical
configuration, it can be observed only in supersymmetric models where the
neutralino momenta can be kinematically reconstructed, such as in models with
R-parity violation.


title: On solar neutrino fluxes in radiochemical experiments

abstract:
  We analyze fluctuations of the solar neutrino flux using data from the
Homestake, GALLEX, GNO, SAGE and Super Kamiokande experiments. Spectral
analysis and direct quantitative estimations show that the most stable
variation of the solar neutrino flux is a quasi-five-year periodicity. The
revised values of the mean solar neutrino flux are presented in Table 4. They
were used to estimate the observed pp-flux of the solar electron neutrinos near
the Earth. We consider two alternative explanations for the origin of a
variable component of the solar neutrino deficit.


title:
Transversity and its accompanying T-odd distribution from Drell-Yan
  processes with pion-proton collisions

abstract:
  It is studied the possibility of direct extraction of the transversity and
its accompanying T-odd parton distribution function (PDF) from Drell-Yan (DY)
processes with unpolarized pion beam and with both unpolarized and transversely
polarized proton targets. At present, such a measurement can be performed on
the COMPASS experiment at CERN. The preliminary estimations performed for
COMPASS kinematic region demonstrate that it is quite real to extract both
transversity and its accompanying T-odd PDF in the COMPASS conditions


title: Scalar sextet in the 331 model with right-handed neutrinos

abstract:
  A Higgs sextet is introduced in order to generate Dirac and Majorana neutrino
masses in the 331 model with right-handed neutrinos. As will be seen, the
present sextet introduction leads to a rich neutrino mass structure. The
smallness of neutrino masses can be achieved via, for example, a seesaw limit.
The fact that the masses of the charged leptons are not effected by their new
Yukawa couplings to the sextet is convenient for generating small neutrino
masses.


title: Towards the NNLL precision in $\bar B \to X_s \gamma$

abstract:
  The present NLL prediction for the decay rate of the rare inclusive process
$\bar B \to X_s \gamma$ has a large uncertainty due to the charm mass
renormalization scheme ambiguity. We estimate that this uncertainty will be
reduced by a factor of 2 at the NNLL level. This is a strong motivation for the
on-going NNLL calculation, which will thus significantly increase the
sensitivity of the observable $\bar B \to X_s \gamma$ to possible new degrees
of freedom beyond the SM. We also give a brief status report of the NNLL
calculation.


title:
Challenge of lepton pair production in peripheral collisions of
  relativistic ions

abstract:
  The new approach to the lepton pair production in the Coulomb field of two
highly relativistic nuclei was developed.Solving the operator equation for
lepton scattering in arbitrary Coulomb field, we obtain the amplitudes for
lepton scattering in the Coulomb potential in terms of light cone variables.
Using the Watson expansion for the amplitude of lepton scattering on two
centers we propose prescription which allows one to construct the amplitude for
lepton pair production in the Coulomb field of two highly relativistic ions. We
show that for the certain sums of finite terms of the Watson series numerous
cancellations lead to infrared stability of amplitude.


title:
Two-Loop ${\cal O}(\alpha\alpha_s)$ Corrections to the On-Shell Fermion
  Propagator in the Standard Model

abstract:
  In this paper we consider mixed two-loop electroweak corrections to the top
quark propagator in the Standard Model. In particular, we compute the on-shell
renormalization constant for the mass and wave function, which constitute
building blocks for many physical processes. The results are expressed in terms
of master integrals. For the latter practical approximations are derived. In
the case of the mass renormalization constant we find agreement with the
results in the literature.


title: The Decoherence Time in High Energy Heavy Ion Collisions

abstract:
  We calculate the decoherence time of the ground state wave function of a
nucleus in a high energy heavy ion collision. We define this time as the decay
time of the ratio Tr D^2 / (Tr D)^2 of traces of the density matrix D. We find
that this time is smaller or equal to 1/Q_s, where the saturation scale Q_s is
defined within the color glass condensate model of parton saturation. Our
result supports the notion that the extremely rapid entropy production deduced
for the early stage of heavy ion collisions at collider energies is to a large
extent caused by the decoherence of the initial-state wave functions.


title: Hard spectator-scattering in B -> pi pi decays at NNLO

abstract:
  We compute the 1-loop (NNLO) corrections to hard spectator-scattering in
tree-dominated hadronic B decays. Depending on the values of hadronic input
parameters the corrections are shown to have a significant impact on the B ->
pi pi branching fractions.


title:
Symmetries of 2HDM, different vacua, CP violation and possible relation
  to a history of time

abstract:
  The same physical reality in Two Higgs doublet model (2HDM) can be described
by different Lagrangians. We call this property the reparametrization
invariance (in space of Lagrangians) and study corresponding symmetry group and
its subgroup describing rephasing invariance. Next we consider the
$Z_2$-symmetry of the Lagrangian, which prevents a
$\phi_1\leftrightarrow\phi_2$ transitions, and the different levels of its
violation, soft and hard. We argue that the 2HDM with a soft breaking of
$Z_2$-symmetry is a natural model in the description of EWSB. We also consider
vacuum structure of the 2HDM. We find very simple condition for a CP violation
in the Higgs sector. In the Model II for Yukawa interactions we obtain the set
of relations among the couplings to gauge bosons and to fermions which allows
one to analyze different physical situations (including CP violation) in terms
of these very couplings, instead of the parameters of Lagrangian. We discuss
possible interaction of Higgs fields of SM or 2HDM with inflatory Higgs field
describing exponential expansion of Universe after Big Bang and possible
variation in the scenario of beginning of Time.


title: Tri-Bimaximal Neutrino Mixing, A4 and the Modular Symmetry

abstract:
  We formulate and discuss a 4-dimensional SUSY version of an A4 model for
tri-bimaximal neutrino mixing which is completely natural. We also study the
next-to-the-leading corrections and show that they are small, once the ratios
of A4 breaking VEVs to the cutoff are fixed in a specified interval. We also
point out an interesting way of presenting the A4 group starting from the
modular group. In this approach, which could be interesting in itself as an
indication on a possible origin of A4, the lagrangian basis where the symmetry
is formulated coincides with the basis where the charged leptons are diagonal.
If the same classification structure in A4 is extended from leptons to quarks,
the CKM matrix coincides with the unit matrix in leading order and a study of
non leading corrections shows that the departures from unity of the CKM matrix
are far too small to accomodate the observed mixing angles.


title: Single-flavour and two-flavour pairing in three-flavour quark matter

abstract:
  We study single-flavour quark pairing ("self-pairing") in
colour-superconducting phases of quark matter, paying particular attention to
the difference between scenarios where all three flavours undergo
single-flavour pairing, and scenarios where two flavours pair with each other
("2SC" pairing) and the remaining flavour self-pairs. We perform our
calculations in the mean field approximation using a pointlike four-fermion
interaction based on single gluon exchange. We confirm the result from previous
weakly-coupled-QCD calculations, that when all three flavours self-pair the
favored channel for each is colour-spin-locked (CSL) pseudoisotropic pairing.
However, we find that when the up and down quarks undergo 2SC pairing, they
induce a colour chemical potential that disfavors the CSL phase. The strange
quarks then self-pair in a "polar" channel that breaks rotational invariance,
although the CSL phase may survive in a narrow range of densities.


title: Beam normal spin asymmetry in the quasi-RCS approximation

abstract:
  The two-photon exchange contribution to the single spin asymmetries with the
spin orientation normal to the reaction plane is discussed for elastic
electron-proton scattering in the equivalent photon approximation. In this
case, hadronic part of the two-photon exchange amplitude describes real Compton
scattering (RCS). We show that in the case of the beam normal spin asymmetry,
this approximation selects only the photon helicity flip amplitudes of RCS. At
low energies, we make use of unitarity and estimate the contribution of the
$\pi N$ multipoles to the photon helicity flip amplitudes. In the Regge regime,
QRCS approximation allows for a contribution from two pion exchange, and we
provide an estimate of such contributions. We furthermore discuss the
possibility of the quark and gluon GPD's contributions in the QRCS kinematics.


title: Doubly virtual Compton scattering and the beam normal spin asymmetry

abstract:
  We construct an invariant basis for Compton scattering with two virtual
photons (VVCS). The basis tensors are chosen to be gauge invariant and
orthogonal to each other. The properties of the corresponding 18 invariant
amplitudes are studied in detail. We consider the special case of elastic VVCS
with the virtualities of the initial and final photons equal. The invariant
basis for VVCS in this orthogonal form does not exist in the literatur. We
furthermore use this VVCS tensor for a calculation of the beam normal spin
asymmetry in the forward kinematics. For this, we relate the invariant
amplitudes to the helicity amplitudes of the VVCS reaction. The imaginary parts
of these latter are related to the inclusive cross section by means of the
optical theorem. We use the phenomenological value of the transverse cross
section $\sigma_T\sim0.1$ mbarn and the Callan-Gross relation which relates the
longitudinal cross section $\sigma_L$ to the transverse one. The result of the
calculation agrees with an existing calculation and predicts the negative
values of the asymmetry $B_n$ of the order of 4-6 ppm in the energy range from
6 to 45 ppm and for very forward angles.


title: Electron-Neutrino Bremsstrahlung in Electro-Weak Theory

abstract:
  The electron-neutrino bremsstrahlung process has been considered in the
framework of electro-weak theory. The scattering cross section has been
calculated in the center of mass frame and approximated to extreme relativistic
as well as non-relativistic case. The rate of energy-loss via this type of
bremsstrahlung process has been obtained both in non-degenerate and degenerate
region. The effect of this electron-neutrino bremsstrahlung process in
different ranges of temperature and density characterizing the late stages of
stellar evolution has been discussed. It is found from our study that this
bremsstrahlung process is highly important in the non-degenerate region,
although it might have some significant effect in the extreme relativistic
degenerate region.


title:
New experimental constraints on polarizability corrections to hydrogen
  hyperfine structure

abstract:
  We present a state-of-the-art evaluation of the polarizability
corrections--the inelastic nucleon corrections--to the hydrogen ground-state
hyperfine splitting using analytic fits to the most recent data. We find a
value $\Delta_{\rm pol} = 1.3 \pm 0.3$ ppm. This is 1--2 ppm smaller than the
value of $\Delta_{\rm pol}$ deduced using hyperfine splitting data and elastic
nucleon corrections obtained from modern form factor fits.


title: Thermal photons and dileptons

abstract:
  We discuss the status of a subset of penetrating probes in relativistic
nuclear collisions. Thermal photons and dileptons are considered, as well as
the electromagnetic signature of jets.


title: Direct photon interferometry

abstract:
  We consider recent developments in the theory of the two-photon
interferometry in ultrarelativistic heavy ion collisions with emphasis on the
difference between photon and hadron interferometry. We review the available
experimental results and discuss possibilities of measurement of the photon
Bose-Einstein correlations in ongoing and future experiments.


title: Twistor String Theory and QCD

abstract:
  I review recent progress in using twistor-inspired methods to compute
perturbative scattering amplitudes in gauge theory, for application to collider
physics.


title: New solutions for the color-flavor locked strangelets

abstract:
  Recent publications rule out the negatively charged beta equilibrium
strangelets in ordinary phase, and the color-flavor locked (CFL) strangelets
are reported to be also positively charged. This letter presents new solutions
to the system equations where CFL strangelets are slightly negatively charged.
If the ratio of the square-root bag constant to the gap parameter is smaller
than 170 MeV, the CFL strangelets are more stable than iron and the normal
unpaired strangelets. For the same parameters, however, the positively charged
CFL strangelets are more stable.


title:
Chiral symmetry breaking in confining theories and asymptotic limits of
  operator product expansion

abstract:
  The pattern of spontaneous chiral symmetry breaking (CSB) in confining
background fields is analyzed. It is explicitly demonstrated how to get the
inverse square root large proper time asymptotic of the operator product
expansion which is needed for CSB.


title: Longitudinal Polarized Parton Densities Updated

abstract:
  We have re-analyzed the world data on inclusive polarized DIS, in both NLO
and LO QCD, including the new HERMES and COMPASS data. The updated NLO
polarized densities are given in both the $\rm \bar{MS}$ and JET schemes. The
impact of the new data on the results is discussed.


title:
Neutrino Bremsstrahlung Process in highly degenerate magnetized electron
  gas

abstract:
  In this article the neutrino bremsstrahlung process is considered in presence
of strong magnetic field, though the calculations for this process in absence
of magnetic field are also carried out simultaneously. The electrons involved
in this process are supposed to be highly degenerate and relativistic. The
scattering cross sections and energy loss rates for both cases, in presence and
absence of magnetic field, are calculated in the extreme-relativistic limit.
Two results are compared in the range of temperature $5.9\times 10^{9}$ K $<
T\leq 10^{11}$ K and magnetic field $10^{14} - 10^{16}$ G at a fixed density
$\sim 10^{15}$ $gm/cc$, a typical environment during the cooling of magnetized
neutron star. The interpretation of our result is briefly discussed and the
importance of this process during the stellar evolution is speculated.


title: Plasma Neutrino Process in Strong Magnetic Field

abstract:
  The decay of magneto-plasma into neutrino anti-neutrino pair has been studied
in the framework of the electro-weak interaction theory. The decay rate is
calculated and the expression for the energy-loss rate is obtained in the
extreme relativistic case. The neutrino luminosity has also been computed for a
neutron star. A comparative study between the decay of magneto-plasma and the
ordinary plasma neutrino process has been outlined in view of the cooling of
highly magnetized star. The effect of this process in the different regions
during the late stages of stellar evolution is discussed briefly.


title: Self-compression and catastrophic collapse of photon bullets in vacuum

abstract:
  Photon-photon scattering, due to photons interacting with virtual
electron-positron pairs, is an intriguing deviation from classical
electromagnetism predicted by quantum electrodynamics (QED). Apart from being
of fundamental interest in itself, collisions between photons are believed to
be of importance in the vicinity of magnetars, in the present generation
intense lasers, and in intense laser-plasma/matter interactions; the latter
recreating astrophysical conditions in the laboratory. We show that an intense
photon pulse propagating through a radiation gas can self-focus, and under
certain circumstances collapse. This is due to the response of the radiation
background, creating a potential well in which the pulse gets trapped, giving
rise to photonic solitary structures. When the radiation gas intensity has
reached its peak values, the gas releases part of its energy into `photon
wedges', similar to Cherenkov radiation. The results should be of importance
for the present generation of intense lasers and for the understanding of
localized gamma ray bursts in astrophysical environments. They could
furthermore test the predictions of QED, and give means to create ultra-intense
photonic pulses.


title: Right-Handed Sneutrino as Cold Dark Matter

abstract:
  We consider supersymmetric models with right-handed neutrinos where neutrino
masses are purely Dirac-type. In this model, right-handed sneutrino can be the
lightest supersymmetric particle and can be a viable candidate of cold dark
matter of the universe. Right-handed sneutrinos are never thermalized in the
early universe because of weakness of Yukawa interaction, but are effectively
produced by decays of various superparticles. We show that the present mass
density of right-handed sneutrino can be consistent with the observed dark
matter density.


title: Tagging the pion quark structure in QCD

abstract:
  We combine the constraints on the pion quark structure available from
perturbative QCD, nonperturbative QCD (nonlocal QCD sum rules and light cone
sum rules) with the analysis of current data on F_{\pi\gamma\gamma^*}(Q^2),
including recent high-precision lattice calculations of the second moment of
the pion's distribution amplitude. We supplement these constraints with those
extracted from the renormalon approach by means of the twist-four contributions
to the pion distribution amplitude in order to further increase stability with
respect to related theoretical uncertainties. We show which regions in the
space of the first two non-trivial Gegenbauer coefficients a_2 and a_4 of all
these constraints overlap, tagging this way the pion structure to the highest
degree possible at present.


title:
Gluon transverse momenta and charm quark-antiquark pair production in
  $p-\bar p$ collisions at Tevatron

abstract:
  We discuss and compare different approaches to include gluon transverse
momenta for heavy quark-antiquark pair production. The correlations in
azimuthal angle and in heavy quark, heavy antiquark transverse momenta are
studied in detail. The results are illustrated with the help of different
unintegrated gluon distribution functons (UGDF) from the literature. We compare
results obtained with on-shell and off-shell matrix elements and kinematics and
quantify where these effects are negligible and where they are essential. We
concentrate on the region of asymmetric transverse momenta of charm quark and
charm antiquark. Most of UGDFs lead in this corner of the phase space to almost
full decorellation in azimuthal angle. We propose correlation observables to be
best suited in order to test the existing models of UGDFs.


title:
Double Transverse-Spin Asymmetries in Drell-Yan Processes with
  Antiprotons

abstract:
  We present next-to-leading order predictions for double transverse-spin
asymmetries in Drell--Yan dilepton production initiated by proton--antiproton
scattering. The kinematic region of the proposed PAX experiment at GSI:
$30\lesssim{s}\lesssim200\GeV^2$ and $2\lesssim{M}\lesssim7\GeV$ is examined.
The Drell--Yan asymmetries turn out to be large, in the range 20--40%.
Measuring these asymmetries would provide the cleanest determination of the
quark transversity distributions.


title:
Joint description of weak radiative and nonleptonic hyperon decays in
  broken SU(3)

abstract:
  We give a joint description of weak radiative (WR) and nonleptonic (NL)
hyperon decays (HD) in broken SU(3). The two groups of decays are linked via
$SU(2)_W$ spin symmetry and vector meson dominance (VMD). We use experimental
information on the parity-conserving (p.c.) NLHD amplitudes to fix the
corresponding WRHD amplitudes. With the latter known, the data on the WRHD
branching ratios and asymmetries permit us to determine the parity-violating
(p.v.) WRHD amplitudes in terms of two parameters corresponding to the
two-quark and single-quark transitions. We obtain a good description of the
data, and in particular a large $\Sigma ^+ \to p \gamma$ asymmetry. Then, using
the $SU(2)_W$+VMD route we determine the non-soft-meson correction term in the
p.v. NLHD amplitudes. The latter is shown to subtract a substantial amount from
the current-algebra commutator thus leading towards the resolution of the S:P
discrepancy in NLHD.


title: Bypassing the axial anomalies

abstract:
  Many meson processes are related to the U_A(1) axial anomaly, present in the
Feynman graphs where fermion loops connect axial vertices with vector vertices.
However, the coupling of pseudoscalar mesons to quarks does not have to be
formulated via axial vertices. The pseudoscalar coupling is also possible, and
this approach is especially natural on the level of the quark substructure of
hadrons. In this paper we point out the advantages of calculating these
processes using (instead of the anomalous graphs) the Feynman graphs where
axial vertices are replaced by pseudoscalar vertices. We elaborate especially
the case of the processes related to the Abelian axial anomaly of QED, but we
speculate that it seems possible that effects of the non-Abelian axial anomaly
of QCD can be accounted for in an analogous way.


title: Helicity Formalism and Spin Asymmetries in Hadronic Processes

abstract:
  We present a generalized QCD factorization scheme for the high energy
inclusive polarized process, (A, S_A) + (B, S_B) -> C + X, including all
intrinsic partonic motions. This introduces many non-trivial azimuthal phases
and several new spin and k_T dependent soft functions. The formal expressions
for single and double spin asymmetries are discussed. Numerical results for
A_N[p(transv. polarized) p -> pi + X] are presented.


title: Dynamics of quark-gluon plasma from Field correlators

abstract:
  It is argued that strong dynamics in the quark-gluon plasma and bound states
of quarks and gluons is mostly due to nonperturbative effects described by
field correlators. The emphasis in the paper is made on two explicit
calculations of these effects from the first principles: one analytic using
gluelump Green's functions and another using independent lattice data on
correlators. The resulting hadron spectra are investigated in the range T_c < T
< 2T_c. The spectra of charmonia, bottomonia, light s-sbar mesons, glueballs
and quark-gluon states calculated numerically are in general agreement with
lattice MEM data. The possible role of these bound states in the thermodynamics
of quark-gluon plasma is discussed.


title: Lepton Self-Mass, Higgs Scalar and Heavy Quark Masses

abstract:
  This paper has been presented at the DESY Workshop, October 22-24, 1979.
Assuming cancellation of lepton self-mass ultraviolet divergences in the SU(2)
x U(1) gauge theory, we predict heavy quark t and Higgs scalar masses. In
Eq.(6), the mass sum rule necessary to the vanishing of quadratic divergences
is formulated.


title: New CP-odd Observable in H -> t \bar{t}

abstract:
  We study a CP-violating triple product correlation that occurs in the decay
of a neutral Higgs boson into t\bar{t} pairs when the Higgs boson does not have
a definite CP nature. We consider the H -> t \bar{t} decay channel as well as
the gluon fusion process gg -> H -> t \bar{t}. The asymmetry in Higgs decay,
normalized to the H -> t \bar{t} width, can reach the 6% percent level. In the
gluon fusion process the corresponding normalized asymmetry is smaller by an
order of magnitude. We present a crude estimate of this observable at the LHC.


title: Little Higgs Models and Their Phenomenology

abstract:
  This article reviews the Little Higgs models of electroweak symmetry breaking
and their phenomenology. Little Higgs models incorporate a light composite
Higgs boson and remain perturbative until a scale of order 10 TeV, as required
by precision electroweak data. The collective symmetry breaking mechanism,
which forms the basis of Little Higgs models, is introduced. An explicit, fully
realistic implementation of this mechanism, the Littlest Higgs model, is then
discussed in some detail. Several other implementations, including simple group
models and models with T parity, are also reviewed. Precision electroweak
constraints on a variety of Little Higgs models are summarized. If a Little
Higgs model is realized in nature, the predicted new particles should be
observable at the Large Hadron Collider (LHC). The expected signatures, as well
as the experimental sensitivities and the possible strategies for confirming
the Little Higgs origin of new particles, are discussed. Finally, several other
related topics are briefly reviewed, including the ultraviolet completions of
Little Higgs models, as well as the implications of these models for flavor
physics and cosmology.


title:
Geometric scaling violations in the central rapidity region of d+Au
  collisions at RHIC

abstract:
  We show that geometric scaling is satisfied to good accuracy in the forward
region of d+Au collisions at RHIC. Scaling violations do show up, however, at
mid-rapidity, and the anomalous dimension of the small-x gluon distribution
evolves to near its DGLAP limit for transverse momenta of a few GeV. This
represents a first consistency check of RHIC deuteron-nucleus and HERA DIS
phenomenology, and of the universality of the underlying Color Glass Condensate
(CGC) theory, which describes both phenomena. It also reconciles successful
leading-twist LO and NLO perturbative QCD computations of mid-rapidity particle
production with small-x evolution. Finally, we introduce a new parameterization
for the anomalous dimension of the small-x gluon distribution which properly
reproduces known theoretical limits at large rapidity, at large virtuality, and
on the saturation boundary, and still fits the available data from d+Au
collisions at RHIC. We find indications that sub-asymptotic terms in the
rapidity-evolution of the anomalous dimension are large.


title:
Quantum numbers of heavy neutrinos, tri-bi-maximal mixing through double
  seesaw with permutation symmetry, and comment on $\theta_{\rm
  sol}+\theta_c\simeq \frac{\pi}{4}$

abstract:
  Using the family symmetry, in the neutrino mass matrix we remove the Yukawa
coupling (arising in the Dirac type mass between the heavy neutrinos and light
lepton doublets) dependence in the double seesaw mechanism so that it is
directly proportional to the mass matrix $m^{(nn)}$ of heavy Majorana
neutrinos. The family symmetry is supposed to be broken spontaneously at high
energy scale so that the neutrino mass matrix is given by the family symmetry
at high energy scale. With the permutation symmetry $S_3$, we note a variety of
possible mass hierarchies arising distinctly in neutrinos, charged leptons,
$Q_{\rm em}=-\frac13$ quarks, and $Q_{\rm em}=\frac23$ quarks. Distinguishing
these hierarchies, we obtain a relation between the CKM angles and the MNS
angles. Finally, we comment on the approximate relation $\theta_{\rm
sol}+\theta_c\simeq \frac{\pi}{4}$.


title:
Distinguishing New Physics Scenarios at a Linear Collider with Polarized
  Beams

abstract:
  Numerous non-standard dynamics are described by contact-like effective
interactions that can manifest themselves through deviations of the cross
sections from the Standard Model predictions. If one such deviation were
observed, one should try to identify to a given confidence level the actual
source among the possible non-standard interactions that in principle can
explain it. We here estimate the potential identification reach on different
New Physics effective interactions, obtainable from the angular distributions
of lepton pair production processes at the planned International Linear
Collider with polarized beams. The models discussed are the interactions based
on gravity in large and in TeV^{-1} extra dimensions and the
compositeness-inspired four-fermion contact interactions. The availability of
both beams polarized in many cases plays an essential role in enhancing the
identification sensitivity.


title: Neutrinos, leptonic CP violation and the origin of matter

abstract:
  I review some aspects related with the connections between neutrino physics
and the thermal leptogenesis mechanism for the generation of the cosmological
baryon asymmetry of the Universe. A special attention is devoted to the problem
of establishing a bridge between leptonic CP violation at low and high
energies.


title:
Dark Matter Constraints on Gaugino/Higgsino Masses in Split
  Supersymmetry and Their Implications at Colliders

abstract:
  In split supersymmetry, gauginos and Higgsinos are the only supersymmetric
particles which are possibly accessible at foreseeable colliders. While the
direct experimental searches, such as LEP and Tevatron experiments, gave robust
lower bounds on the masses of these particles, the cosmic dark matter can give
some upper bounds and thus have important implications for the searches at
future colliders. In this work we scrutinize such dark matter constraints and
show the allowed mass range for charginos and neutralinos (the mass eigenstates
of gauginos and Higgsinos). We find that the lightest chargino must be lighter
than about 1 TeV under the popular assumption M_1=M_2/2 and about 2 or 3 TeV in
other cases. The corresponding production rates of the lightest chargino at the
CERN Large Hadron Collider (LHC) and the International Linear Colldier (ILC)
are also shown. While in some parts of the allowed region the chargino pair
production rate can be larger than 1 pb at LHC and 100 fb at the ILC, other
parts of the region correspond to very small production rates and thus there is
no guarantee to find the charginos of split supersymmetry at future colliders.


title: LEP Indications for Two Light Higgs Bosons and U(1)' Model

abstract:
  Reanalyses of LEP data have shown preference to two light CP-even Higgs
bosons. We discuss implications of such a Higgs boson spectrum for the minimal
supersymmetric model extended by a Standard Model singlet chiral superfield and
an additional Abelian gauge invariance (the U(1)' model). We, in particular,
determine parameter regions that lead to two light CP-even Higgs bosons while
satisfying existing bounds on the mass and mixings of the extra vector boson.
In these parameter regions, the pseudoscalar Higgs is found to be nearly
degenerate in mass with either the lightest or next-to-lightest Higgs boson.
Certain parameters of the U(1)' model such as the effective mu parameter are
found to be significantly bounded by the LEP two-light-Higgs signal.


title: On the Discrepancy of pp, pbar p Total Cross Sections at sqrt s = 1.8TeV

abstract:
  Based on the previous approach, we have investigated a possibility to resolve
the discrepancy between the E710, E811 and CDF at sqrt s =1.8TeV, using the
experimental data of the pp, pbar p total cross sections sigma tot(+) and
rho(+)$ ratio up to the SPS experiments (sqrt s = 0.9TeV) as inputs. We predict
sigma tot(pbar p) and rho(pbar p) at the Tevatron energy(sqrt s=1.8TeV) as
sigma tot(pbar p)=75.9+- 1.0mb, rho(pbar p)=0.136+- 0.005.
  It turns out that only the data of E710 is consistent with the prediction in
the one standard deviation. So we can conclude that E710 is preferable but we
can exclude neither CDF nor E811 results.


title: A new $N^*(1675)$ resonance in the $\gamma N\to\eta N$ reaction

abstract:
  We study the $\eta$-photoproduction focusing on the new nucleon resonance
which was observed at $\sqrt{s}=1675$ MeV with a narrow decay width ($\sim 10$
MeV) in the recent GRAAL experiment. Using an effective Lagrangian approach, we
compute differential cross sections for the $\eta$-photoproduction. In addition
to $N^*(1675)$, we employ three other nucleon resonances, i.e. $N^*(1535)$,
$N^*(1650)$ and $N^*(1710)$, and vector meson exchanges which are the most
relevant ones to this reaction process. As a result, we can reproduce the GRAAL
data qualitatively well and observe obvious isospin asymmetry between the
transition magnetic moments of $N^*(1675)$: $\mu_{\gamma nn^*}\gg\mu_{\gamma
pp^*}$.


title:
The Dilepton Q_T Spectrum in Transversely Polarized Drell-Yan Process in
  QCD

abstract:
  We discuss the transverse momentum Q_T distribution of Drell-Yan pair,
produced in collisions of transversely polarized protons. We calculate the
transversely polarized Drell-Yan cross section up to order \alpha_s in the
dimensional regularization scheme, which gives QCD prediction at large Q_T. For
small Q_T region, we include all-orders resummation of large logarithms due to
emission of soft gluons up to next-to-leading logarithmic accuracy. At
intermediate Q_T region, the resummation formula is matched with the
fixed-order \alpha_s perturbative results in a systematic way, so that we
derive the cross section with uniform accuracy over the entire range of Q_T.


title: Gauge invariant source terms in QCD

abstract:
  We discuss how to implement the source terms in Quantum Chromodynamics (QCD)
respecting gauge invariance and noncommutativity of color charge density
operators. We start with decomposing the generating functional of QCD into
constituents projected to have specified color charge density. We demonstrate
that such a projection leads to the gauge invariant source terms consisting of
a naive form accompanied by the density of states which cancels the gauge
dependence. We then illustrate that this form is equivalently rewritten into a
manifestly gauge invariant expression in terms of the Wilson line. We confirm
that noncommutativity of color charge density operators is fulfilled in both
representations of the source terms. We point out that our results are useful
particularly to consider the problems of the quantum evolution in high energy
QCD.


title: Coherent pion production by neutrinos on nuclei

abstract:
  The main part of coherent pion production by neutrinos on nuclei is
essentially determined by PCAC, provided that the leptonic momentum transferred
square Q^2 remains sufficiently small. We give the formulas for the charged and
neutral current cross sections, including also the small non-PCAC transverse
current contributions and taking into account the effect of the \mu^- mass. Our
results are compared with the experimental ones and other theoretical
treatments.


title: Transversity

abstract:
  Some general remarks on parton transverse spin distributions and transverse
motions are presented. The issue of accessing experimental information on the
transversity distributions h_1^q is discussed. In particular direct information
could be obtained from Drell-Yan processes with polarized protons and
antiprotons (planned at GSI), while indirect information, coupling h_1^q to the
Collins fragmentation function, is being gathered by HERMES and COMPASS
collaborations. The related issue of transverse Single Spin Asymmetries (SSA)
measured in several processes and the role of the Sivers distribution function
is also discussed.


title:
NLO calculation of the Delta F = 2 Hamiltonians in the MSSM and
  phenomenological analysis of the B - Bbar mixing

abstract:
  We present the NLO corrections to the Wilson coefficients of the Delta F = 2
Hamiltonians in the strong interacting sector of the MSSM, responsible for
neutral meson oscillations. Such corrections, combined with the NLO anomalous
dimension matrix for the Delta F = 2 operators and the corresponding hadronic
matrix elements calculated on the lattice, allow for the first time a full NLO
phenomenological analysis of the observables related to meson oscillations. We
present preliminary results in the B_d - B_d bar sector.


title: Rare Kaon Decays K->pi n n and KL->pi l+l-

abstract:
  Over the next years, the Flavour Physics community will be looking for
inconsistencies of the Standard Model (SM) by exploiting new and precise
measurements. In these ``indirect new physics'' searches, the key strategy is
to concentrate on observables, which are theoretically clean and preferably
suppressed in the SM. In this respect, the four golden modes K+->pi+ n n,
KL->pi n n and KL->pi0 l+l- are very promising. The pollution from hadronic
uncertainties in these decays is at present under control with good accuracy,
thanks to the interplay between theory information (Chiral Perturbation Theory
and OPE) and experimental inputs (KTeV, NA48). Their measurements might thus
give rise to some unexpected scenario. Here, we briefly review the present
situation for these four exclusive rare decays.


title:
Improved Limit on theta_{13} and Implications for Neutrino Masses in
  Neutrino-less Double Beta Decay and Cosmology

abstract:
  We analyze the impact of a measurement, or of an improved bound, on
theta_{13} for the determination of the effective neutrino mass in
neutrino-less double beta decay and cosmology. In particular, we discuss how an
improved limit on (or a specific value of) theta_{13} can influence the
determination of the neutrino mass spectrum via neutrino-less double beta
decay. We also discuss the interplay with improved cosmological neutrino mass
searches.


title: Suppressing Proton Decay in Theories with Localised Fermions

abstract:
  We calculate the contribution to the proton decay amplitude from Kaluza-Klein
lepto-quarks in theories with extra dimensions, localised fermions and gauge
fields which propagate in the bulk. Such models naturally occur within the
context of M-theory. In SU(5) models we show that carefully including all such
modes gives a distinctive pattern of decays through various channels including
a strong suppression of decays into neutrinos or right handed positrons. By
contrast there is no such suppression for SO(10).


title: On the cos 2 phi asymmetry in unpolarized leptoproduction

abstract:
  We investigate the origin of the cos 2 phi azimuthal asymmetry in unpolarized
semiinclusive DIS. The contributions to this asymmetry arising from the
intrinsic transverse motion of quarks are explicitly evaluated, and predictions
for the HERMES and COMPASS kinematic regimes are presented. We show that the
effect of the leading-twist Boer-Mulders function h_1^perp(x, k_T^2), which
describes a correlation between the transverse momentum and the transverse spin
of quarks, is quite significant and may also account for a part of the cos 2
phi asymmetry measured by ZEUS in the perturbative domain.


title: Hard diffraction -- 20 years later

abstract:
  The idea of diffractive processes with a hard scale involved, to resolve the
underlying parton dynamics, was published 1985 and experimentally verified
1988. Today hard diffraction is an active research field with high-quality data
and new theoretical models. The trend from Regge-based pomeron models to
QCD-based parton level models has given insights on QCD dynamics involving
perturbative gluon exchange mechanisms, including the predicted BFKL-dynamics,
as well as novel ideas on non-perturbative colour fields and their
interactions. Extrapolations to the LHC include the interesting possibility of
diffractive Higgs production.


title:
Comparison of Boltzmann Equations with Quantum Dynamics for Scalar
  Fields

abstract:
  Boltzmann equations are often used to study the thermal evolution of particle
reaction networks. Prominent examples are the computation of the baryon
asymmetry of the universe and the evolution of the quark-gluon plasma after
relativistic heavy ion collisions. However, Boltzmann equations are only a
classical approximation of the quantum thermalization process which is
described by the so-called Kadanoff-Baym equations. This raises the question
how reliable Boltzmann equations are as approximations to the full
Kadanoff-Baym equations. Therefore, we present in this paper a detailed
comparison between the Kadanoff-Baym and Boltzmann equations in the framework
of a scalar Phi^4 quantum field theory in 3+1 space-time dimensions. The
obtained numerical solutions reveal significant discrepancies in the results
predicted by both types of equations. Apart from quantitative discrepancies, on
a qualitative level the universality respected by the Kadanoff-Baym equations
is severely restricted in the case of Boltzmann equations. Furthermore, the
Kadanoff-Baym equations strongly separate the time scales between kinetic and
chemical equilibration. This separation of time scales is absent for the
Boltzmann equation.


title: Weak phase alpha from B^0-> a_1^{+-}(1260) pi^{-+}

abstract:
  Quasi two-body decays B^0(t)-> a_1^{+-}(1260) pi^{-+} identified by four
charged pions determine a phase alpha_eff, which is equal to the weak phase
alpha in the limit of vanishing penguin amplitudes. Applying flavor SU(3) to
these decays and to B->a_1 K and B->K_1 pi, with K_1 an admixture of K_1(1270)
and K_1(1400), we derive expressions providing bounds on alpha-alpha_{eff}.
Higher precision in alpha may be achieved by an overall fit to a complete set
of SU(3) related measurements. A method is sketched applying isospin symmetry
to time-dependent invariant mass distributions in B->pi^+ pi^- pi^0 pi^0.


title: Mathematics of complexity in experimental high energy physics

abstract:
  Mathematical ideas and approaches common in complexity-related fields have
been fruitfully applied in experimental high energy physics also. We briefly
review some of the cross-pollination that is occurring.


title: Multi-parton Cross Sections at Hadron Colliders

abstract:
  We present an alternative method to calculate cross sections for multi-parton
scattering processes in the Standard Model at leading order. The helicity
amplitudes are computed using recursion relations in the number of particles,
based on Dyson-Schwinger equations whereas the summation over colour and
helicity configurations is performed by Monte Carlo methods. The computational
cost of our algorithm grows asymptotically as 3^n, where n is the number of
particles involved in the process, as opposed to the n!-growth of the Feynman
diagram approach. Typical results for the total cross section, differential
distributions of invariant masses and transverse momenta of partons are
presented and cross checked by explicit summation over colours.


title: Odderon and Pomeron from the Vacuum Correlator Method

abstract:
  Glueball masses with J<=7 are computed both for C=+1 and C=-1 using the
string Hamiltonian derived in the framework of the Vacuum Correlator Method. No
fitting parameters are used, and masses are expressed in terms of string
tension $\sigma$ and effective value of $\alpha_s$. We extend the calculations
done for J<=3 using the same Hamiltonian, which provided glueball masses in
good agreement with existing lattice data, to higher mass states. It is shown
that 3^{--}, 5^{--} and 7^{--} states lie on the odderon trajectories with the
intercept around or below 0.14. Another odderon trajectory with 3g glueballs of
Y-shape, corresponds to 11% higher masses and low intercept. These findings are
in agreement with recent experimental data, setting limits on the odderon
contribution to the exclusive $\gamma p$ reactions.


title: Squarks and Sleptons between Branes and Bulk

abstract:
  We study gaugino-mediated supersymmetry breaking in a six-dimensional SO(10)
orbifold GUT model where quarks and leptons are mixtures of brane and bulk
fields. The couplings of bulk matter fields to the supersymmetry breaking brane
field have to be suppressed in order to avoid large FCNCs. We derive bounds on
the soft supersymmetry breaking parameters and calculate the superparticle mass
spectrum. If the gravitino is the LSP, the stau_1 or the snu_tau turns out to
be the NLSP, with characteristic signatures at future colliders and in
cosmology.


title: Corrigan-Ramond Extension of QCD at Nonzero Baryon Density

abstract:
  We investigate the Corrigan-Ramond extension of one massless flavor Quantum
Chromo Dynamics at nonzero quark chemical potential. Since the extension
requires the fermions to transform in the two index antisymmetric
representation of the gauge group, one finds that the number of possible
channels is richer than in the 't Hooft limit. We first discuss the diquark
channels and show that for a number of colors larger than three a new diquark
channel appears. We then study the infinite number of color limit and show that
the Fermi surface is unstable to the formation of the
Deryagin-Grigoriev-Rubakov chiral waves. We discover, differently from the 't
Hooft limit, the possibility of a colored chiral wave breaking the color
symmetry as well as translation invariance.


title: Potential for Higgs Physics at the LHC and Super-LHC

abstract:
  The expected sensitivity of the LHC experiments to the discovery of the Higgs
boson and the measurement of its properties is presented in the context of both
the standard model and the its minimal supersymmetric extension. Prospects for
a luminosity-upgraded ``Super-LHC'' are also presented.


title: Range of validity of transport equations

abstract:
  Transport equations can be derived from quantum field theory assuming a loss
of information about the details of the initial state and a gradient expansion.
While the latter can be systematically improved, the assumption about a memory
loss is in general not controlled by a small expansion parameter. We determine
the range of validity of transport equations for the example of a scalar $g^2
\Phi^4$ theory. We solve the nonequilibrium time evolution using the three-loop
2PI effective action. The approximation includes off-shell and memory effects
and assumes no gradient expansion. This is compared to transport equations to
lowest order (LO) and beyond (NLO). We find that the earliest time for the
validity of transport equations is set by the characteristic relaxation time
scale $t_{\rm damp} = - 2\omega/\Sigma^{\rm (eq)}_\varrho$, where $-\Sigma^{\rm
(eq)}_\varrho/2$ denotes the on-shell imaginary-part of the self-energy. This
time scale agrees with the characteristic time for partial memory loss, but is
much shorter than thermal equilibration times. For times larger than about
$t_{\rm damp}$ the gradient expansion to NLO is found to describe the ``full''
results rather well for $g^2 \lesssim 1$.


title: Quarkonia Correlators Above Deconfinement

abstract:
  We study the quarkonia correlators above deconfinement using the potential
model with screened temperature-dependent potentials. We find that while the
qualitative features of the spectral functions, such as the survival of the 1S
state, can be reproduced by potential models, the temperature dependence of the
correlators disagree with the recent lattice data.


title: Can $B -> X_c \ell \nu$ help us extract |V_{ub}| ?

abstract:
  We study radiative corrections to $\bar{B} \to X_c \ell \bar{\nu}_\ell$
decays assuming the power counting $m_c \sim \sqrt{\Lambda_QCD m_b}$ for the
charm-quark mass. Concentrating on the shape-function region, we use effective
field-theory methods to calculate the hadronic tensor at NLO accuracy. From
this we deduce a shape-function independent relation between partially
integrated $\bar{B} \to X_c\ell\bar{\nu}_\ell$ and $\bar{B} \to X_u \ell
\bar{\nu}_\ell$ spectra to leading power in $1/m_b$, including first-order
corrections in the strong coupling constant. This may provide an independent
cross-check on the determination of the CKM element |V_{ub}|.


title: Fermion Delocalization in Higgsless Models

abstract:
  In the linear moose framework, which naturally emerges in deconstruction
models, we discuss the effect of direct couplings between the left-handed
fermions living on the boundary of the chain and the gauge fields in the
internal sites. This is realized by means of a product of nonlinear sigma-model
scalar fields which, in the continuum limit, is equivalent to a Wilson line.
The effect of these new nonlocal couplings is a contribution to the S parameter
which can be of opposite sign with respect to the one coming from the gauge
fields along the string. Therefore, with some fine-tuning, it is possible to
satisfy the constraints from the electro-weak data without spoiling the
perturbative unitarity limit, which, in these models is generally postponed
with respect to the Higgsless Standard Model one.


title:
Laurent series expansion of a class of massive scalar one-loop integrals
  up to ${\cal O}(\ep^2)$ in terms of multiple polylogarithms

abstract:
  In a recent paper we have presented results for a set of massive scalar
one-loop master integrals needed in the NNLO parton model description of the
hadroproduction of heavy flavors. The one--loop integrals were evaluated in
$n=4-2\ep$ dimension and the results were presented in terms of a Laurent
series expansion up to ${\cal O}(\ep^2)$. We found that some of the $\ep^2$
coefficients contain a new class of functions which we termed the $L$
functions. The $L$ functions are defined in terms of one--dimensional integrals
involving products of logarithm and dilogarithm functions. In this paper we
derive a complete set of algebraic relations that allow one to convert the $L$
functions of our previous approach to a sum of classical and multiple
polylogarithms. Using these results we are now able to present the $\ep^2$
coefficients of the one-loop master integrals in terms of classical and
multiple polylogarithms.


title:
Flavoured leptogenesis: a successful thermal leptogenesis with N_1 mass
  below 10^8 GeV

abstract:
  We prove that taking correctly into account the lepton flavour dependence of
the CP asymmetries and washout processes, it is possible to obtain successful
thermal leptogenesis from the decays of the second right-handed neutrino. The
asymmetries in the muon and tau-flavour channels are then not erased by the
inverse decays of the lightest right-handed neutrino, N_1. In this way, we
reopen the possibility of ``thermal leptogenesis'' in models with a strong
hierarchy in the right-handed Majorana masses that is typically the case in
models with up-quark--neutrino Yukawa unification.


title:
The relativistic hydrogen atom: a theoretical laboratory for structure
  functions

abstract:
  Thanks to the Dirac equation, the hydrogen-like atom at high $Z$ offers a
precise model of relativistic bound state, allowing to test properties of
unpolarized and polarized structure functions analogous to the hadronic ones,
in particular: Sivers effect, sum rules for the vector, axial, tensor charges
and for the magnetic moment, positivity constraints, sea contributions and
fracture functions


title: Deriving the pomeron from a Euclidean-Minkowskian duality

abstract:
  After a brief review, in the first part, of some relevant analyticity
properties of the loop-loop scattering amplitudes in gauge theories, when going
from Minkowskian to Euclidean theory, in the second part we shall see how they
can be related to the still unsolved problem of the s-dependence of the
hadron-hadron total cross-sections.


title: What is the Discrete Gauge Symmetry of the MSSM?

abstract:
  We systematically study the extension of the Supersymmetric Standard Model
(SSM) by an anomaly-free discrete gauge symmetry Z_N. We extend the work of
Ibanez and Ross with N=2,3 to arbitrary values of N. As new fundamental
symmetries, we find four Z_6, nine Z_9 and nine Z_18. We then place three
phenomenological demands upon the low-energy effective SSM: (i) the presence of
the mu-term in the superpotential, (ii) baryon-number conservation upto
dimension-five operators, and (iii) the presence of the see-saw neutrino mass
term LHLH. We are then left with only two anomaly-free discrete gauge
symmetries: baryon-triality, B_3, and a new Z_6, which we call proton-hexality,
P_6. Unlike B_3, P_6 prohibits the dimension-four lepton-number violating
operators. This we propose as the discrete gauge symmetry of the Minimal SSM,
instead of R-parity.


title:
Phenomenological analysis of the CLAS data on double charged pion photo
  and electro- production

abstract:
  First comprehensive data on the evolution of nucleon resonance photocouplings
with photon virtuality Q^2 are presented for excited proton states in the mass
range from 1.4 to 2.0 GeV. N^* photocouplings were determined in
phenomenological analysis of CLAS data on 2 pi photo and electroproduction
within the framework of the JLAB-MSU phenomenological model.


title: Nonrelativistic QCD for coloured scalar fields

abstract:
  We present an effective field theory suitable to describe a non-relativistic
particle-antiparticle pair of heavy scalars based on the gauge group SU(3). Its
formulation is analogous to that of "velocity NRQCD" (vNRQCD), a
non-relativistic effective theory for heavy quark pairs. The matching
conditions with scalar QCD and the renormalization group evolution of the
effective theory are discussed. The non-relativistic framework proposed here
suffices to compute scalar-antiscalar bound state energies at
next-to-next-to-leading-logarithmic (NNLL) order and
next-to-leading-logarithmic (NLL) threshold production of squarks in $e^+e^-$
and $\gamma\gamma$ collisions, in particular of the lighter scalar top quark at
a future Linear Collider.


title: Derivative dispersion relations above the physical threshold

abstract:
  We discuss some formal and practical aspects related to the replacement of
Integral Dispersion Relations (IDR) by derivative forms, without high-energy
approximations. We first demonstrate that, for a class of functions with
physical interest as forward scattering amplitudes, this replacement can be
analytically performed, leading to novel Extended Derivative Dispersion
Relations (EDDR), which, in principle, are valid for any energy above the
physical threshold. We then verify the equivalence between the IDR and EDDR by
means of a popular parametrization for total cross sections from proton-proton
and antiproton-proton scattering and compare the results with those obtained
through other representations for the derivative relations. Critical aspects on
the limitations of the whole analysis, from both formal and practical points of
view, are also discussed in some detail.


title: Parton Distributions and the Strong Coupling Strength: CTEQ6AB PDFs

abstract:
  We study the global analysis for parton distributions as a function of the
QCD strong coupling strength alpha_s, and present a new series of distributions
that span the range 0.110 < alpha_s(m_Z) < 0.128. We use these distributions to
explore the correlation between alpha_s and the gluon distribution; the
viability of global analysis as a method to measure alpha_s; and the dependence
on alpha_s of predictions for W, Z, inclusive jet, and Higgs boson production
($b \bar{b} \to H$ and $gg \to H$) cross sections at the Tevatron and the LHC.
We find that the uncertainty in alpha_s is the dominant source of uncertainty
for inclusive jet production at moderately small p_T and for Higgs production
at intermediate masses in the standard model.


title:
A Numerical Analysis of the Supersymmetric Flavor Problem and Radiative
  Fermion Masses

abstract:
  We study the SUSY flavor problem in the MSSM, we are namely interested in
estimating the size of the SUSY flavor problem and its dependence on the MSSM
parameters. For that, we made a numerical analysis randomly generating the
entries of the sfermion mass matrices and then determinated which percentage of
the points are consistent with current bounds on the flavor violating
transitions on lepton flavor violating (LFV) decays $l_i \to l_j \gamma$. We
applied two methods, mass-insertion approximation method (MIAM) and full
diagonalization method (FDM). Furthermore, we determined which fermion masses
could be radiatively generated (through gaugino-sfermion loops) in a natural
way, using those random sfermion matrices. In general, the electron mass
generation can be done with 30% of points for large $\tan\beta$, in both
schemes the muon mass can be generated by 40% of points only when the most
precise sfermion splitting (from the FDM) is taken into account.


title: The flavor of a little Higgs with T-parity

abstract:
  We analyze flavor constraints in the littlest Higgs model with T-parity. In
particular, we focus on neutral meson mixing in the K, B, and D systems due to
one loop contributions from T-parity odd fermions and gauge bosons. We
calculate the short distance contributions to mixing for a general choice of
T-odd fermion Yukawa couplings. We find that for a generic choice of textures,
a TeV scale GIM suppression is necessary to avoid large contributions. If order
one mixing angles are allowed in the extended flavor structure, the mass
spectrum is severely constrained, and must be degenerate at the 1-5% level.
However, there are still regions of parameter space where only a loose
degeneracy is necessary to avoid constraints. We also consider the B(s) system,
and identify a scenario in which the mixing can be significantly enhanced
beyond the standard model prediction while still satisfying bounds on the other
mixing observables. We present both analytical and numerical results as
functions of the T-odd fermion mass eigenvalues.


title: U(1)_B-L: Neutrino Physics and Inflation

abstract:
  A gauged U(1)_B-L symmetry predicts three right handed handed neutrinos and
its spontaneous breaking automatically yields the seesaw mechanism. In a
supersymmetric setting this breaking can be nicely linked with inflation to
yield deltaT/ T proportional to (M_B-L / M_P)^2, where M_B-L (M_P) denote the
B-L breaking (Planck) scale. Thus M_B-L is estimated to be of order 10^16 GeV,
and the heaviest right handed neutrino mass is less than or of order 10^14 GeV.
A second right handed neutrino turns out to have a mass of order 10-10^2 T_r,
where T_r (<~10^9 GeV) denotes the reheat temperature. A U(1) R symmetry plays
an essential role in implementing inflation and leptogenesis, resolving the
MSSM mu problem and eliminating dimension five nucleon decay. An unbroken Z_2
subgroup plays the role of matter parity. The scalar spectral index
n_s=0.99+-0.01 for the simplest models, while in smooth hybrid inflation
n_s>=0.97. The tensor to scalar ratio r is negligible, and dn_s/dlnk<~10^-3.


title: Properties of Fermion Mixings in Intersecting D-brane Models

abstract:
  We consider the Yukawa couplings for quarks and leptons in the context of
Pati-Salam model using intersecting D-brane models where the Yukawa coupling
matrices are rank one in a simple choice of family replication. The CKM mixings
can be explained by perturbing the rank 1 matrix using higher order terms
involving new Higgs fields available in the model. We show that the near
bi-large neutrino mixing angles can be naturally explained, choosing the light
neutrino mass matrix to be type II seesaw dominant. The predicted value of
U_{e3} is in the range \simeq 0.05-0.15. In the quark sector, V_{cb} is
naturally close to the strange/bottom quark mass ratio and we obtain an
approximate relation V_{ub} V_{cb} \simeq (m_s/m_b)^2 V_{us}. The geometrical
interpretations of the neutrino mixings are also discussed.


title: Minimal Supergravity with m_0^2 < 0

abstract:
  We extend the parameter space of minimal supergravity to negative values of
m_0^2, the universal scalar mass parameter defined at the grand unified scale.
After evolving to the weak scale, all scalars can be non-tachyonic with masses
consistent with collider constraints. This region of parameter space is
typically considered excluded by searches for charged dark matter, since the
lightest standard model superpartner is a charged slepton. However, if the
gravitino is the lightest supersymmetric particle, the charged slepton decays,
and this region is allowed. This region provides qualitatively new
possibilities for minimal supergravity, including spectra with light sleptons
and very heavy squarks, and models in which the lightest slepton is the
selectron. We show that the m_0^2 < 0 region is consistent with low energy
precision data and discuss its implications for particle colliders. These
models may provide signals of supersymmetry in even the first year of operation
at the Large Hadron Collider.


title: Infrared Scales and Factorization in QCD

abstract:
  Effective field theory methods are used to study factorization of the deep
inelastic scattering cross-section. The cross-section is shown to factor in
QCD, even though it does not factor in perturbation theory for some choices of
the infrared regulator. Messenger modes are not required in soft-collinear
effective theory for deep inelastic scattering as x -> 1.


title: How to measure Pomeron phase and discover odderon at HERA and RHIC

abstract:
  We suggest to measure Pomeron phase and discover odderon via the measurement
of charge asymmetry of pions in the diffractive processes $ep\to e\pi^+\pi^-
p$, $eA\to e\pi^+\pi^- A$ and in the processes $AA\to AA\pi^+\pi^-$ with two
rapidity gaps.


title:
Mixing-induced CP asymmetry in B-> K* gamma decays with perturbative QCD
  approach

abstract:
  The mixing-induced CP asymmetries in B-> K* gamma -> K_S pi^0 gamma and B->
K* gamma -> K_L pi^0 gamma are expected to be small within the standard model.
So they are among the most promising decay modes to test the standard model. In
this paper, we compute the mixing-induced CP asymmetries in these decay modes,
within the framework of the standard model, using perturbative QCD, and our
conclusion is S_{K_S pi^0 gamma}=-S_{K_L pi^0 gamma}=-(3.5\pm 1.7)\times
10^{-2}.