title:
Full-Phase-Space Twist Expansion in Semileptonic and Radiative B-Meson
  Decays

abstract:
  We study the Lambda_QCD/M_B corrections from subleading shape functions in
inclusive B-meson decays. We propose a natural and smooth interpolation from
the endpoint region to the full phase space, and derive expressions for the
triple differential decay rate in B -> X_u l nu and the photon energy spectrum
in B -> X_s gamma. Our results are valid to order Lambda_QCD/M_B for hadronic
invariant masses of order Lambda_QCD M_B and to order Lambda_QCD^2/M_B^2 for
larger hadronic masses. They allow a systematic investigation of the transition
between the separate regimes of the local and nonlocal expansions, and can be
used to study decay distributions in any kinematic variables. We consider
several examples of interest and point out that a combined measurement of
hadronic energy and invariant mass provides an alternative to the extraction of
|V_ub| which is largely independent of shape function effects and in principle
allows a higher accuracy than the combined measurement of leptonic and hadronic
invariant masses. We perform the expansion directly in QCD light-cone
operators, and give a discussion of the general basis of light-cone operators.
Reparametrization invariance under the change of the light-cone direction
reduces the number of independent shape functions. We show that differing
previous results for the lepton energy spectrum obtained from different choices
of light-cone coordinates are in agreement.


title:
Prospects for the Search for a Doubly-Charged Higgs in the Left-Right
  Symmetric Model with ATLAS

abstract:
  We estimate the potential for observation at the LHC of a doubly charged
Higgs boson, as predicted in Left-Right symmetric models. Single production by
vector boson fusion, $W^+W^+ \to \Delta_{L,R}^{++}$ and pair production by the
Drell-Yan process $q \bar q \to \Delta_{L,R}^{++}\Delta_{L,R}^{--}$ are
considered. Various decay channels are investigated: dileptons, including pairs
of $\tau$'s, as well as $WW$


title: Unveiling Neutrino Mixing and Leptonic CP Violation

abstract:
  We review the present understanding of neutrino masses and mixings,
discussing what are the unknowns in the three family oscillation scenario.
Despite the anticipated success coming from the planned long baseline neutrino
experiments in unraveling the leptonic mixing sector, there are two important
unknowns which may remain obscure: the mixing angle $\theta_{13}$ and the
CP-phase $\delta$. The measurement of these two parameters has led us to
consider the combination of superbeams and neutrino factories as the key to
unveil the neutrino oscillation picture.


title:
A Gauge-Mediation Model with a Light Gravitino of Mass O(10) eV and the
  Messenger Dark Matter

abstract:
  In the light of recent experimental data on gaugino searches, we revisit the
direct-transmission model of dynamical supersymmery breaking with the gravitino
mass m_{\tilde{G}}\leq 16 eV, which does not have any cosmological or
astrophysical problems. We find that in the consistent regions of parameter
space, the model predicts not only upper bounds on superparticle masses (1.1
TeV, 320 GeV, 160 GeV, 5 TeV, 1.5 TeV and 700 GeV for gluino, Wino, Bino,
squarks, left-handed sleptons and right-handed sleptons, respectively), but
also a mass of the lightest messenger particle in the range of 10-50 TeV. The
lightest messenger particle can naturally be a messenger sneutrino. Therefore,
this may suggest that the messenger sneutrino could be the dark matter, as
proposed recently by Hooper and March-Russel to account for the gamma-ray
spectrum from the galactic center observed by HESS experiment.


title: Quark asymmetries in the proton from a model for parton densities

abstract:
  Based on quantum fluctuations in momentum and of the proton into meson-baryon
pairs, we develop a physical model for the non-perturbative x-shape of parton
density functions in the proton. The model describes the proton structure
function and gives a natural explanation of observed quark asymmetries, such as
the difference between the anti-up and anti-down sea quark distributions and
between the up and down valence distributions. An asymmetry in the momentum
distribution of strange and anti-strange quarks in the nucleon is found to
reduce the NuTeV anomaly to a level which does not give a significant
indication of physics beyond the standard model.


title: The pion and kaon electromagnetic form factors

abstract:
  We use recent data on K^+ -> pi^+e^+e^-, together with known values for the
pion form factor, to derive the kaon electromagnetic form factor for 0 <q^2
<0.125 (GeV/c)^2. The results are then compared with predictions of the Linear
sigma Model, a quark-triangle model and Vector Meson Dominance. The first two
models describe the data at least qualitatively, but the simple Vector Meson
Dominance picture gives a detailed quantitative fit to the experimental
results.


title:
Future Precision Neutrino Oscillation Experiments and Theoretical
  Implications

abstract:
  Future neutrino oscillation experiments will lead to precision measurements
of neutrino mass splittings and mixings. The flavour structure of the lepton
sector will therefore at some point become better known than that of the quark
sector. This article discusses the potential of future oscillation experiments
on the basis of detailed simulations with an emphasis on experiments which can
be done in about ten years. In addition, some theoretical implications for
neutrino mass models will be briefly discussed.


title: Re (epsilon'/epsilon_K) vs. B_d -> phi K_S CP asymmetry

abstract:
  In a SUSY GUT seesaw scenario, the largeness of the atmospheric neutrino
mixing can reflect itself into an enhanced flavor changing mixing of beauty and
strange right-handed scalar quarks. If the CP violating phase in such down type
squark RR insertion is the main source of CP asymmetry in B_d -> phi K_S and
the gluino contributions to K0-K0 bar and B0-B0 bar mixing are negligible,
there is a correlation between Re (epsilon'/epsilon_K) and B_d -> phi K_S CP
asymmetry, in addition to that with the strange quark CEDM. The current data on
Re (epsilon'/epsilon_K) = (16.7 +- 2.6) 10^-4 imply that S_{phi K} should be
greater than \sim 0.5 (0.25) for mu tan beta = 1 (5) TeV, assuming the RR
dominance in b -> s transition and the minimal supergravity type boundary
conditions for soft parameters.


title:
Radiatively Generated Isospin Violations in the Nucleon and the NuTeV
  Anomaly

abstract:
  Predictions of isospin asymmetries of valence and sea distributions are
presented which are generated by QED leading ${\cal{O}}(\alpha)$ photon
bremsstrahlung effects. Together with isospin violations arising from
nonperturbative hadronic sources (such as quark and target mass differences) as
well as with even a conservative contribution from a strangeness asymmetry
($s\neq \bar{s}$), the discrepancy between the large NuTeV `anomaly' result for
$\sin^2\theta_W$ and the world average of other measurements is removed.


title: Evidence for radiative generation of lepton masses

abstract:
  We present a fit to the experimental charged lepton masses as coming from
radiative corrections in QED.


title: A Bethe-Salpeter study with the <A^2>-enhanced effective QCD coupling

abstract:
  Dyson-Schwinger equations provide a prominent approach to physics of strong
interactions. To reproduce the hadronic phenomenology well, the Dyson-Schwinger
approach in the rainbow-ladder approximation must employ an effective
interaction between quarks which is fairly strong at intermediate (Q^2 approx.
0.5 GeV^2) spacelike transferred momenta. We have recently proposed that such
an interaction may originate from the dimension 2 gluon condensate <A^2> which
has recently attracted much attention, and showed that the resulting effective
running coupling leads to the sufficiently strong dynamical chiral symmetry
breaking and successful phenomenology at least in the light sector of
pseudoscalar mesons. In the present paper, we give a more detailed
investigation of the parameter dependence of these results.


title: Chiral Symmetry Restoration through Hawking-Unruh Thermalization Effect

abstract:
  Comments on the chiral symmetry restoration through the Hawking-Unruh effect
are given.


title: Light-quark Loops in K->pi nu nu

abstract:
  We present a comprehensive analysis of the contributions to K->pi nu nu
decays not described by the leading dimension-six effective Hamiltonian. These
include both dimension-eight four-fermion operators generated at the charm
scale, and genuine long-distance contributions which can be described within
the framework of chiral perturbation theory. We show that a consistent
treatment of the latter contributions, which turn out to be the dominant
effect, requires the introduction of new chiral operators already at O(GF^2
p^2). Using this new chiral Lagrangian, we analyze the long-distance structure
of K->pi nu nu amplitudes at the one-loop level, and discuss the role of the
dimension-eight operators in the matching between short- and long-distance
components. From the numerical point of view, we find that these O(GF^2
LambdaQCD^2) corrections enhance the SM prediction of Br(K+->pi+ nu nu) by
about 6%


title: The < S P P > Green function and SU(3) breaking in K_{l3} decays

abstract:
  Using the 1/N_C expansion scheme and truncating the hadronic spectrum to the
lowest-lying resonances, we match a meromorphic approximation to the < S P P >
Green function onto QCD by imposing the correct large-momentum falloff, both
off-shell and on the relevant hadron mass shells. In this way we determine a
number of chiral low-energy constants of O(p^6), in particular the ones
governing SU(3) breaking in the K_{l3} vector form factor at zero momentum
transfer. The main result of our matching procedure is that the known loop
contributions largely dominate the corrections of O(p^6) to f_{+}(0). We
discuss the implications of our final value f_{+}^{K^0 \pi^-}(0)=0.984 \pm
0.012 for the extraction of V_{us} from K_{l3} decays.


title: Solving the leading order evolution equation for GPDs

abstract:
  An analytic method for the solution of the evolution equation for GPDs is
presented. The small x, xi asymptotics of GPDs are calculated.


title:
Using Charge Asymmetries to Measure Single Top Quark Production at the
  LHC

abstract:
  Electroweak production of single top quarks is an as-yet-unverified
prediction of the Standard model, potentially sensitive to new physics. Two of
the single top quark productions channels have significant charge asymmetries
at the LHC, while the much larger background from $t\bar{t}$ is nearly
charge-symmetric. This can be used to reduce systematic uncertainties and make
precision measurements of single top quark production.


title: Spontaneous CP Symmetry Breaking at the Electroweak Scale

abstract:
  We present a top-condensation model in which the CP symmetry is spontaneously
broken at the electroweak scale due to the condensation of two composite Higgs
doublets. In particular the CP-violating phase of the CKM matrix is generated.
A simpler model where only one quark family is included is also discussed. In
this case, for a general four-fermion interaction ($G_{tb}\neq 0$), the
particle spectrum is the one of the one Higgs doublet model.


title:
Grand Unification, Dark Matter, Baryon Asymmetry, and the Small Scale
  Structure of the Universe

abstract:
  We consider a minimal grand unified model where the dark matter arises from
non-thermal decays of a messenger particle in the TeV range. The messenger
particle compensates for the baryon asymmetry in the standard model and gives
similar number densities to both the baryon and the dark matter. The
non-thermal dark matter, if massive in the GeV range, could have a
free-streaming scale in the order of 0.1 Mpc and potentially resolve the
discrepancies between observations and the LCDM model on the small scale
structure of the Universe. Moreover, a GeV scale dark matter naturally leads to
the observed puzzling proximity of baryonic and dark matter densities.
Unification of gauge couplings is achieved by choosing a "Higgsino" messenger.


title: Neutrinospheres, resonant neutrino oscillations, and pulsar kicks

abstract:
  Pulsars are rapidly rotating neutron stars and are the outcome of the
collapse of the core of a massive star with a mass of the order of or larger
than eight solar masses. This process releases a huge gravitational energy of
about 10^{53} erg, mainly in the form of neutrinos. During the collapse the
density increases, and so does the magnetic field due to the trapping of the
flux lines of the progenitor star by the high conductivity plasma. When the
density reaches a value of around 10^{12} g cm^{-3} neutrinos become trapped
within the protoneutron star and a neutrinosphere, characterized inside by a
diffusive transport of neutrinos and outside by a free streaming of neutrinos,
is formed and lasts for a few seconds. Here we focus on the structure of the
neutrinosphere, the resonant flavor conversion that can happen in its interior,
and the neutrino flux anisotropies induced by this phenomena in the presence of
a strong magnetic field. We present a detailed discussion in the context of the
spherical Eddington model, which provides a simple but reasonable description
of a static neutrino atmosphere, locally homogenous and isotropic. Energy and
momentum are transported by neutrinos and antineutrinos flowing through an
ideal gas of nonrelativistic, nondegenerate nucleons and relativistic,
degenerate electrons and positrons. We examine the details of the asymmetric
neutrino emission driven by active-sterile neutrino oscillations in the
magnetized protoneutron star, and the possibility for this mechanism to explain
the intrinsic large velocities of pulsars respect to nearby stars and
associated supernova remnants.


title:
Neutrino Oscillations in a Supersymmetric SO(10) Model with Type-III
  See-Saw Mechanism

abstract:
  The neutrino oscillations are studied in the framework of the minimal
supersymmetric SO(10) model with Type-III see-saw mechanism by additionally
introducing a number of SO(10) singlet neutrinos. The light Majorana neutrino
mass matrix is given by a combination of those of the singlet neutrinos and the
$SU(2)_L$ active neutrinos. The minimal SO(10) model gives an unambiguous Dirac
neutrino mass matrix, which enables us to predict the masses and the other
parameters for the singlet neutrinos. These predicted masses take the values
accessible and testable by near future collider experiments under the
reasonable assumptions. More comprehensive calculations on these parameters are
also given.


title: Higgs Sector of the Left-Right Model with Explicit CP Violation

abstract:
  We explore the Higgs sector of the Minimal Left-Right (LR) Model based on the
gauge group SU(2)_L x SU(2)_R x U(1)_{B-L} with explicit CP violation in the
Higgs potential. Since flavour-changing neutral current experiments and the
small scale of neutrino masses both place stringent constraints on the Higgs
potential, we seek to determine whether minima of the Higgs potential exist
that are consistent with current experimental bounds. We focus on the case in
which the right-handed symmetry-breaking scale is only ``moderately'' large, of
order 15-50 TeV. Unlike the case in which the Higgs potential is CP-invariant,
the CP noninvariant case does yield viable scenarios, although these require a
small amount of fine-tuning. We consider a LR model supplemented by an
additional U(1) horizontal symmetry, which results in a Higgs sector consistent
with current experimental constraints and a realistic spectrum of neutrino
masses.


title: Signals for CP Violation in Split Supersymmetry

abstract:
  Split supersymmetry is characterized by relatively light chargino and
neutralino sector and very heavy sfermion sector. We study the consequence of
CP violation in this scenario by evaluating two-loop contributions to electric
dipole moments of fermions from Higgs-photon as well as $W$-$W$ diagrams. These
contributions add coherently and produce electron and neutron electric dipole
moments close to present bounds. We then explore Higgs production at a
photon-photon collider, and consider the feasibility of measuring CP violating
$h\gamma\gamma$ coupling induced by chargino loops. Methods of enhancing the
sensitivity are discussed. For lower chargino masses and lower Higgs boson
masses, the effect of the CP violation can be observed with 90% confidence
level significance.


title: Lower Limit on Dark Matter Production at the Large Hadron Collider

abstract:
  We evaluate the prospects for finding evidence of dark matter production at
the Large Hadron Collider. We consider WIMPs and superWIMPs, weakly- and
superweakly-interacting massive particles, and characterize their properties
through model-independent parameterizations. The observed relic density then
implies lower bounds on dark matter production rates as functions of a few
parameters. For WIMPs, the resulting signal is indistinguishable from
background. For superWIMPs, however, this analysis implies significant
production of metastable charged particles. For natural parameters, these rates
may far exceed Drell-Yan cross sections and yield spectacular signals.


title:
Reconstruction of the Neutrino Mixing Matrix and Leptonic Unitarity
  Triangles from Long-baseline Neutrino Oscillations

abstract:
  We derive a new set of sum rules between the neutrino mass and mixing
parameters in vacuum and their effective counterparts in matter. The moduli of
nine genuine lepton mixing matrix elements can then be calculated in terms of
the matter-corrected ones, and the latter can directly be determined from a
variety of long-baseline neutrino oscillations. We show that it is possible to
reconstruct the leptonic unitarity triangles and CP violation in a similar
parametrization-independent way.


title: From Leading Hadron Suppression to Jet Quenching at RHIC and at the LHC

abstract:
  In nucleus-nucleus collisions at the Relativistic Heavy Ion Collider (RHIC),
one generically observes a strong medium-induced suppression of high-pT hadron
production. This suppression is accounted for in models which assume a
significant medium-induced radiative energy loss of high-pT parent partons
produced in the collision. How can we further test the microscopic dynamics
conjectured to underly this abundant high-pT phenomenon? What can we learn
about the dynamics of parton fragmentation, and what can we learn about the
properties of the medium which modifies it ? Given that inelastic parton
scattering is expected to be the dominant source of partonic equilibration
processes, can we use hard processes as an experimentally well-controlled
window into QCD non-equilibrium dynamics ? Here I review what has been achieved
so far, and which novel opportunities open up with higher luminosity at RHIC,
and with the wider kinematical range accessible soon at the LHC.


title:
Possible Effects of Dark Energy on the Detection of Dark Matter
  Particles

abstract:
  We study in this paper the possible influence of the dark energy on the
detection of the dark matter particles. In models of dark energy described by a
dynamical scalar field such as the Quintessence, its interaction with the dark
matter will cause the dark matter particles such as the neutralino vary as a
function of space and time. Given a specific model of the Quintessence and its
interaction in this paper we calculate numerically the corrections to the
neutralino masses and the induced spectrum of the neutrinos from the
annihilation of the neutralinos pairs in the core of the Sun. This study gives
rise to a possibility of probing for dark energy in the experiments of
detecting the dark matter particles.


title: QCD Plasma Instabilities and Isotropization

abstract:
  We study the coupled Wong Yang-Mills equations for both U(1) and SU(2) gauge
groups and anisotropic particle momentum distributions numerically on a
lattice. For weak fields with initial energy density much smaller than that of
the particles we confirm the existence of plasma instabilities and exponential
growth of the fields which has been discussed previously. Also, the SU(2) case
is qualitatively similar to U(1), and we do find strong ``abelianization'' of
the non-Abelian fields during the period of exponential growth. However, the
effect nearly disappears when the fields are strong. This is because of the
very rapid isotropization of the particle momenta by deflection in a strong
field on time scales comparable to that for the development of Yang-Mills
instabilities. This happens without entropy production which makes it very
interesting for the phenomenology of high-energy heavy-ion collisions.


title: Lepton Flavor Violation as a Probe of Quark-Lepton Unification

abstract:
  The recent measurements of the solar neutrino mixing angle theta_{sol} and
the Cabibbo mixing angle theta_C reveal a surprising relation,
theta_{sol}+theta_C ~ pi/4. Interpreting this empirical relation as a support
of the quark-lepton unification, we find that the PMNS mixing matrix can be
decomposed into a CKM-like matrix and maximal mixing matrices, which can give
profound implications on the quark-lepton unification. We explore a possibility
to probe the implication of quark-lepton unification by considering the
relative sizes of branching ratios for the lepton flavor violating radiative
decay processes, l_i-->l_j gamma, in the context of the supersymmetric standard
model with heavy right-handed Majorana neutrinos.


title: Lepton angular asymmetries in semileptonic charmful B decays

abstract:
  We study the lepton angular distributions in $B\to D^{(*)} \ell \nu_{\ell}$
decays. The lepton angular asymmetries in the decays with the general effective
interactions are examined. We demonstrate that the asymmetries are sensitive to
new physics with a right-handed quark current.


title:
MATCHIG: A program for matching charged Higgs boson production at hadron
  colliders

abstract:
  This manual describes how to use the MatCHig code for matching the charged
Higgs boson production processes gg->tbH+/- and gb->tH+/-. A negative term,
correcting for the double-counting between these processes, is implemented as
an external process to PYTHIA, allowing the Monte Carlo generation of matched
events. Results from the matching were published in JHEP 0412, 050. The code
can be downloaded from http://www.isv.uu.se/thep/MC/matchig/ .


title:
Cross sections for production of closed superstrings at high energy
  colliders in brane world models

abstract:
  In brane world string models with large extra dimensions, there are processes
where fermion and antifermion (or two gluons) can annihilate producing a light
particle (e.g. gluon) carrying transverse momentum and a Kaluza-Klein graviton
or an excited closed string that propagates in the extra dimensions. In high
energy colliders, this process gives a missing momentum signature. We compute
the total cross section for this process within the context of type II
superstring theory in the presence of a D brane. This includes all missing
energy sources for this string theory model up to s=8M_s^2, and it can be used
to put new limits on the string scale M_s.


title:
Constraint on $B-L$ cosmic string from leptogenesis with degenerate
  neutrinos

abstract:
  In the early Universe, as a consequence of $U(1)_{B-L}$ gauge
symmetry-breaking, the so-called $B-L$ cosmic strings are expected to be
produced at the breaking scale $\eta_{B-L}$ according to the Kibble mechanism.
The decaying, collapsing closed loops of these strings can release the
right-handed neutrinos, whose subsequent decay can contribute to the baryon
asymmetry of the Universe (BAU), through the "slow death"(SD) process and/or
the "quick death"(QD) process. In this paper, we assume that the decay of the
lightest heavy Majorana neutrinos released from the $B-L$ cosmic string loops
can produce a baryon asymmetry consistent with the cosmic microwave background
(CMB) observations. Considering the fact that both the neutrinoless double beta
decay experiment and the cosmological data show a preference for degenerate
neutrinos, we give the lower limits for the breaking scale $\eta_{B-L}$ with
the neutrino masses $0.06 eV \leq \bar{m}=(m_{1}^{2}+m_{2}^{2}+m_{3}^{2})^{1/2}
\leq 1.0 eV$, where the full possible cases of degenerate neutrinos are
included. We obtain $\eta_{B-L}\gtrsim 3.3 \times 10^{15} GeV$, $5.3 \times
10^{15} GeV$ and $9.5 \times 10^{15} GeV$ for $\bar{m}=0.2 eV$, $0.4 eV$ and
$1.0 eV$ respectively in the SD process, and find the $B-L$ cosmic string has a
very small contribution to the BAU in the QD process.


title: Transverse single spin asymmetries in photon production

abstract:
  Transverse single-spin asymmetries (SSA) in inclusive reactions are now
considered to be directly related to the transverse momentum ${\bf k}_{T}$ of
the fundamental partons involved in the process. We find that the ideal probe
to extract information on the gluon Sivers function is the transverse SSA of
prompt photon production $p p^{\uparrow} \to \gamma X$, at large $p_T$. The
following related processes, $p p^{\uparrow} \to \gamma + jet + X$, $p
p^{\uparrow} \to \gamma^* + X \to \mu^+ \mu^- + X$ and $\bar{p} p^{\uparrow}
\to \gamma + X$ are also briefly discussed.


title:
Coupling constants g_a0-omega-gamma as derived from light cone QCD sum
  rules

abstract:
  We investigate the a0-omega-gamma vertex and estimate the coupling constant
in the framework of the light cone QCD sum rules. We compare our result with
the value of the coupling constant was calculated in the QCD sum rules.


title:
Regularization by Dimensional Reduction: Consistency, Quantum Action
  Principle, and Supersymmetry

abstract:
  It is proven by explicit construction that regularization by dimensional
reduction can be formulated in a mathematically consistent way. In this
formulation the quantum action principle is shown to hold. This provides an
intuitive and elegant relation between the D-dimensional Lagrangian and Ward or
Slavnov-Taylor identities, and it can be used in particular to study to what
extent dimensional reduction preserves supersymmetry. We give several examples
of previously unchecked cases.


title: On photon splitting in theories with Lorentz invariance violation

abstract:
  In a model with Lorentz invariance violation implemented through modified
dispersion relations, we estimate the rate for the decay process gamma -> 3
gamma and find that it provides a relevant bound on Lorentz invariance
violation.


title: The $b \to s$ penguin amplitude in charmless $B \to PP$ decays

abstract:
  The $b \to s$ penguin amplitude affects a number of $B$ meson decays to two
pseudoscalar ($P$) mesons in which potential anomalies are being watched
carefully, though none has yet reached a statistically compelling level. These
include (a) a rate for $B^0 \to K^0 \pi^0$ which is slightly enhanced with
respect to expectations; (b) a time-dependent CP asymmetry parameter $S$ for
$B^0 \to K^0 \pi^0$ which is low in comparison with the expected value of $\sin
2 \beta \simeq 0.73$, and (c) a similar deviation in the parameter $S$ for $B^0
\to \eta' K_S$. These and related phenomena involving vector mesons in the
final state are discussed in a unified way in and beyond the Standard Model.
Future experiments which would conclusively indicate the presence of new
physics are identified. Several of these involve decays of the strange $B$
meson $B_s$. In the Standard Model we note an approximate sum rule for CP rate
differences in $B^0\to K^+\pi^-, B^+\to K^+\pi^0$ and $B^0\to K^0\pi^0$,
predicting a negative sign for the latter asymmetry.


title: One-Loop Amplitudes Of Gluons In SQCD

abstract:
  One-loop amplitudes of gluons in supersymmetric Yang-Mills are
four-dimensional cut-constructible. This means that they can be determined from
their unitarity cuts. We present a new systematic procedure to explicitly carry
out any finite unitarity cut integral. The procedure naturally separates the
contributions from bubble, triangle and box scalar integrals. This technique
allows the systematic calculation of N=1 amplitudes of gluons. As an
application we compute all next-to-MHV six-gluon amplitudes in N=1
super-Yang-Mills.


title:
Quarkonia decays into two photons induced by the space-time
  non-commutativity

abstract:
  In this article we propose standard model strictly forbidden decay modes,
quarkonia (QQ(1^{--}) = J/psi, Upsilon) decays into two photons, as a possible
signature of the space-time non-commutativity. An experimental discovery of
J/psi -> gamma gamma and/or Upsilon -> gamma gamma processes would certainly
indicate a violation of the Landau-Pomeranchuk-Yang theorem and a definitive
appearance of new physics.


title:
Even- and Odd-Parity Charmed Meson Masses in Heavy Hadron Chiral
  Perturbation Theory

abstract:
  We derive mass formulae for the ground state, J^P = 0^- and 1^-, and first
excited even-parity, J^P = 0^+ and 1^+, charmed mesons including one loop
chiral corrections and O(1/m_c) counterterms in heavy hadron chiral
perturbation theory. We show that including these counterterms is critical for
fitting the current data. We find that certain parameter relations in the
parity doubling model are not renormalized at one loop, providing a natural
explanation for the equality of the hyperfine splittings of ground state and
excited doublets.


title: Charged Higgs Boson Pairs at the LHC

abstract:
  We compute the cross section for pair production of charged Higgs bosons at
the LHC and compare the three production mechanisms. The bottom-parton
scattering process is computed to NLO, and the validity of the bottom-parton
approach is established in detail. The light-flavor Drell-Yan cross section is
evaluated at NLO as well. The gluon fusion process through a one-loop amplitude
is then compared with these two results. We show how a complete sample of
events could look, in terms of total cross sections and distributions of the
heavy final states.


title:
Reparametrization invariance of B decay amplitudes and implications for
  new physics searches in B decays

abstract:
  When studying B decays within the Standard Model, it is customary to use the
unitarity of the CKM matrix in order to write the decay amplitudes in terms of
only two of the three weak phases which appear in the various diagrams.
Occasionally, it is mentioned that those two weak phases can be used in order
to describe any decay amplitude, even beyond the Standard Model. Here we point
out that, when describing a generic decay amplitude, the two weak phases can be
chosen completely at will, and we study the behavior of the decay amplitudes
under changes in the two weak phases chosen as a basis. Of course, physical
observables cannot depend on such reparametrizations. This has an impact in
discussions of the SM and in attempts to parametrize new physics effects in the
decay amplitudes. We illustrate these issues by looking at B --> psi K_S and
the isospin analysis in B --> pi pi.


title:
Disentangling two- and four-quark state pictures of the charmed scalar
  mesons

abstract:
  We suggest that the recently observed charmed scalar mesons $D_0^{0}(2308)$
(BELLE) and $D_0^{0,+}(2405)$ (FOCUS) are considered as different resonances.
Using the QCD sum rule approach we investigate the possible four-quark
structure of these mesons and also of the very narrow $D_{sJ}^{+}(2317)$,
firstly observed by BABAR. We use diquak-antidiquark currents and work to the
order of $m_s$ in full QCD, without relying on $1/m_c$ expansion. Our results
indicate that a four-quark structure is acceptable for the resonances observed
by BELLE and BABAR: $D_0^{0}(2308)$ and $D_{sJ}^{+}(2317)$ respectively, but
not for the resonances observed by FOCUS: $D_0^{0,+}(2405)$.


title:
Phase transition in gauge theories, monopoles and the Multiple Point
  Principle

abstract:
  This review is devoted to the Multiple Point Principle (MPP), according to
which several vacuum states with the same energy density exist in Nature. The
MPP is implemented to the Standard Model (SM), Family replicated gauge group
model (FRGGM) and phase transitions in gauge theories with/without monopoles.
Lattice gauge theories are reviewed. The lattice results for critical coupling
constants are compared with those of the Higgs Monopole Model (HMM), in which
the lattice artifact monopoles are replaced by the point-like Higgs scalar
particles with a magnetic charge. Considering our (3+1)-dimensional space-time
as discrete, for example, as a lattice with a parameter a=\lambda_P, equal to
the Planck length, we have investigated the additional contributions of
monopoles to beta-functions of renormalization group equations in the FRGGM
extended beyond the SM at high (the Planck scale) energies. We have reviewed
that, in contrast to the Anti-grand unified theory (AGUT), there exists a
possibility of unification of all gauge interactions (including gravity) near
the Planck scale due to monopoles. The unifications [SU(5)]^3 and [SO(10)]^3 at
the GUT-scale \sim 10^{18} GeV are briefly discussed.


title:
Binding Energies and Dissociations of $J/\psi$, $\Upsilon$, and Toponium
  in Quark-Gluon Plasma

abstract:
  In this work, we calculate the binding energies of the $J/\psi$, the
$\Upsilon$, and the Toponium in quark-gluon plasma. We also calculate the
temperature of the quark-gluon plasma at which these quarkonia dissociate. We
approach the problem from a quantum mechanical point of view. We use the
variational method and the screening Debye potential in order to obtain these
binding energies.


title: Role of Positivity Constraints in Determining Polarized Parton Densities

abstract:
  We have re-analyzed the world data on inclusive polarized DIS, in both NLO
and LO QCD, including the very precise JLab Hall A neutron data, and have
studied the role of positivity constraints, and demonstrated their importance,
in determining the strange and gluon densities. We have shown that higher twist
corrections are essential in the analysis of the present data on the structure
function g1. A consistent QCD analysis is achieved, and results for the
polarized parton densities are given in both the MSbare and JET schemes.


title: Circumventing the axial anomalies and the strong CP problem

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 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: A hyperbolic parametrization of lepton mixing for small $U_{e3}$

abstract:
  We use hyperbolic functions to parametrize lepton mixing matrix using only
one input parameter $\phi$. This matrix has three mixing angles as outputs
therefore giving two predictions. In particular it predicts $U_{e3}=0$ besides
predicting correct solar and atmospheric mixing. We confine us to real $\phi$.
For complex $\phi$ mixing matrix is no longer unitary. Next we accentuate this
unitary mixing matrix with an additional small parameter $\delta$ while keeping
unitarity of the matrix exact. When this second parameter is included, with
this framework, one can handle small but non-zero $U_{e3}$. In the second case
from two input parameters one obtains three mixing angles thus one prediction.


title: Minimal Mass Matrices for Dirac Neutrinos

abstract:
  We consider the possibility of neutrinos being Dirac particles and study
minimal mass matrices with as much zero entries as possible. We find that up to
5 zero entries are allowed. Those matrices predict one vanishing mass state, CP
conservation and U_{e3} either zero or proportional to R, where R is the ratio
of the solar and atmospheric \Delta m^2. Matrices containing 4 zeros can be
classified in categories predicting U_{e3} = 0, U_{e3} \neq 0 but no CP
violation or |U_{e3}| \neq 0 and possible CP violation. Some cases allow to set
constraints on the neutrino masses. The characteristic value of U_{e3} capable
of distinguishing some of the cases with non-trivial phenomenological
consequences is about R/2 \sin 2 \theta_{12}. Matrices containing 3 and less
zero entries imply (with a few exceptions) no correlation for the observables.
We outline models leading to the textures based on the Froggatt-Nielsen
mechanism or the non-Abelian discrete symmetry D_4 \times Z_2.


title: Monoenergetic Neutrino Beam for Long Baseline Experiments

abstract:
  In an electron capture process by a nucleus, emitted neutrinos are
monoenergetic. By making use of it, we study how to get a completely
monoenergetic neutrino beam in a long baseline experiment.


title: Relativistic Calculation of the Width of the Theta (1540) Pentaquark

abstract:
  We calculate the width of the Theta(1540) pentaquark in a relativistic model
in which the pentaquark is considered to be composed of a scalar diquark and a
spin 1/2 triquark. We consider both positive and negative parity for the
pentaquark. There is a single parameter in our model which we vary and which
describes the size of the pentaquark. If the pentaquark size is somewhat
smaller than that of the nucleon, we find quite small widths for the pentaquark
of about 1 MeV or less. Our model of confinement plays an important role in our
analysis and makes it possible to use Feynman diagrams to describe the decay of
the pentaquark.


title: Confronting hybrid inflation in supergravity with CMB data

abstract:
  $F$-term GUT inflation coupled to N=1 Supergravity is confronted with CMB
data. Corrections to the string mass-per-unit-length away from the Bogomolny
limit are taken into account. We find that a superpotential coupling
$10^{-7}/\mcN \lesssim \kappa \lesssim 10^{-2}/\mcN$, with $\mcN$ the dimension
of the Higgs-representation, is still compatible with the data. The parameter
space is enlarged in warm inflation, as well as in the curvaton and
inhomogeneous reheat scenario. $F$-strings formed at the end of $P$-term
inflation are also considered. Because these strings satisfy the Bogomolny
bound the bounds are stronger: the gauge coupling is constrained to the range
$10^{-7} < g <10^{-4}$.


title: The Higgs Sector on a Two-Sheeted Space Time

abstract:
  We present a general formalism based on the framework of non-commutative
geometry, suitable to the study the standard model of electroweak interactions,
as well as that of more general gauge theories. Left- and right-handed chiral
fields are assigned to two different sheets of space-time (a discretized
version of Kaluza-Klein theory). Scalar Higgs fields find themselves treated on
the same footing as the gauge fields, resulting in spontaneous symmetry
breaking in a natural and predictable way. We first apply the formalism to the
Standard Model, where one can predict the Higgs mass and the top Yukawa
coupling. We then study the left-right symmetric model, where we show that this
framework imposes constraints on the type and coefficients of terms appearing
in the Higgs potential.


title: Phenomenology Beyond the Standard Model

abstract:
  An elementary review of models and phenomenology for physics beyond the
Standard Model (excluding supersymmetry). The emphasis is on LHC physics. Based
upon a talk given at the Physics at LHC conference, Vienna, 13-17 July 2004.


title:
Lambda(1520,3/2^-) photoproduction reaction via gamma N -> K
  Lambda(1520)

abstract:
  We investigate Lambda(1520,3/2^-,D_03) photoproduction via the gamma N -> K
Lambda^* reaction process. Using effective Lagrangians, we compute the total
and differential cross sections as well as the dependence on the momentum
transfer for the photoproduction at the tree-level. We employ two different
form factors: The four-dimensional gauge-invariant type and the three
dimensional one depending on the external momenta. We find that the total cross
sections for the proton target are well reproduced as compared with the
experimental data. It turns out that the total cross sections for the neutron
target are significantly smaller than those for the proton target. We also
compare the present results with the gamma N -> bar{K} Theta^+ reaction in
order to extract information of Theta^+. Finally the role of K^*--exchange in
the production reaction is discussed.


title: Coupled QCD sum rules for positive and negative-parity nucleons

abstract:
  A new approach of the QCD sum rule is proposed in which positive and
negative-parity baryons couple with each other. With positive and
negative-parity states explicitly taken into account, sum rules are derived by
means of the dispersion relation in energy. The method is applied to the
nucleon channel and the parity splitting of the nucleon resonance states is
studied. It is found that the obtained sum rules have a very good Borel
stability. This suggests that the ansatz for the spectral function in the
present sum rule approximates the physical spectrum better than the usual
lowest pole plus continuum ansatz. The predicted masses of the positive and
negative nucleons reproduce the experimental ones fairly well. Especially, the
mass difference is extremely close to the experimental value.


title: The Pattern of CP Asymmetries in $b\to s$ Transitions

abstract:
  New CP violating physics in $b\to s$ transitions will modify the CP
asymmetries in B decays into final CP eigenstates ($\phi K_S$, $\eta^\prime
K_S$, $\pi^0 K_S$, $\omega K_S$, $\rho^0 K_S$ and $\eta K_S$) from their
Standard Model values. In a model independent analysis, the pattern of
deviations can be used to probe which Wilson coefficients get a significant
contribution from the new physics. We demonstrate this idea using several
well-motivated models of new physics, and apply it to current data.


title: Weak corrections and high $E_T$ jets at Tevatron

abstract:
  We calculate one-loop (purely) Weak (W) corrections of ${\cal
O}(\alpha_{\mathrm{S}}^2\alpha_{\mathrm{W}})$ to the partonic cross section of
two jets at Tevatron and prove that they can be larger than the tree-level
${\cal O}(\alpha_{\mathrm{S}}\alpha_{\mathrm{EW}})$ and ${\cal
O}(\alpha_{\mathrm{EW}}^2)$ Electro-Weak (EW) ones. At high transverse energy
of the jets, all such corrections may lead to detectable effects of, e.g., -10%
or so, with respect to the leading-order (LO) QCD term of ${\cal
O}(\alpha_{\mathrm{S}}^2)$, for the highest value so far probed by Run 2,
depending on the factorisation/renormalisation scale. Besides, they increase
significantly with jet transverse energy. Hence, our results show that EW
corrections may be needed to fit the Standard Model (SM) to present and future
Tevatron jet data.


title: Top quark pair production and decay at a polarized photon collider

abstract:
  Top quark pair production by (polarized) gamma gamma collisions offers an
interesting testing ground of the Standard Model and its extensions. In this
Letter we present results for differential cross sections of top quark pair
production and decay including QCD radiative corrections. We take into account
the full dependence on the top quark spins. We give analytic and numerical
results for single and double differential angular distributions of t tbar
decay products which are due to top quark polarizations and spin correlations
in the intermediate state.


title: Erratum "The Quark-Gluon-Plasma Liquid"

abstract:
  An error in the calculation of the Coulomb coupling parameter of the
quark-gluon plasma is corrected.


title: Dense-Dilute Duality at work: dipoles of the target

abstract:
  We explore the properties of the QCD high energy evolution in the limit of a
dilute target. Using the recently established property of selfduality of the
evolution operator (hep-ph/0502119), we show how to properly define the target
gluon and dipole creation operators in terms of dual Wilson lines (dual eikonal
factors). We explain how to expand these operators in terms of the functional
derivatives of the color charge density, in the situation when they act on the
eikonal factors of the projectile partons. We explicitly calculate the
expansion of the high energy evolution operator to fourth order in the
functional derivatives. Our result is infrared and ultraviolet finite, but does
not coincide with the formula given in hep-ph/0501088. We resolve this
discrepancy by showing that the identification of the dipole creation and
annihilation operators used in hep-ph/0501088 is incomplete, and provide the
required corrections to these definitions. The use of the corrected operators
in the calculational framework of hep-ph/0501088 reproduces our result. We also
prove that there is no discrepancy between the expansion of the JIMWLK equation
and the dualization of the expansion of the weak field limit.


title: Temperature dependence in random matrix models with pairing condensates

abstract:
  We address a number of issues raised by a manuscript of Klein, Toublan, and
Verbaarschot (hep-ph/0405180) in which the authors introduce a random matrix
model for QCD with two colors, two flavors, and fermions in the fundamental
representation. Their inclusion of temperature terms differs from the approach
adopted in previous work on this problem (Phys. Rev. D 64, 074016 (2001).) We
demonstrate that the two approaches are related by a transformation that leaves
the thermodynamic potential invariant and which therefore has no effect on
physical observables.


title: Basic Treatment of QCD Phase Transition Bubble Nucleation

abstract:
  Starting from the QCD Lagrangian and the surface tension of QCD bubbles we
derive the critical size of bubbles, the nucleation probability and the
nucleation site separation distance. We find the separation of sites is more
than an order of magnitude larger than previous QCD model estimates, which
could lead to observable effects.


title: Waking the Colored Plasma

abstract:
  We calculate the wake induced in a hot, dense QCD medium by a fast parton in
the framework of linear response theory. We discuss two different scenarios: a
weakly coupled quark gluon plasma (pQGP) described by hard-thermal loop (HTL)
perturbation theory and a strongly coupled QGP (sQGP), which had the properties
of a quantum liquid.


title: Neutrino 2-3 Symmetry and Inverted Hierarchy

abstract:
  Neutrino oscillation data indicate the presence of a 2-3 symmetry for the
left-handed neutrinos. We show that this symmetry between the second and third
generations cannot be extended to include the charged leptons, no matter what
basis we use. We point out that if this symmetry is also independently valid
for the right-handed neutrinos, then the active neutrino spectrum is inverted,
with $m_3=0$. This conclusion remains valid even when the left-handed 2-3
symmetry is broken by a non-maximal atmospheric mixing angle $\theta_{23}$, or
a non-zero reactor angle $\theta_{13}$. As previously shown by Mohapatra,
Nasri, and Yu, such a symmetry also gives rise to interesting consequences on
the leptogenesis asymmetry parameter $\epsilon_1$.


title: Tachyonic Squarks in Split Supersymmetry

abstract:
  The decoupling of scalar particles in split supersymmetry makes the spectrum
of squarks irrelevant for low energy processes. Nevertheless, the structure of
the vacuum is sensitive to the spectrum of squarks, even when the supersymmetry
breaking scale is large. In this note, we show that in certain regions of the
parameter space, squarks could develop radiatively tachyonic masses, thus
breaking electric charge and color. We discuss the constraints that follow from
the requirement of charge and color conservation, and we comment on the
implications for model building.


title: Transport coefficients in large N_f gauge theories with massive fermions

abstract:
  We compute the shear viscosity and the electrical conductivity in gauge
theories with massive fermions at leading order in the large N_f expansion. The
calculation is organized using the 1/N_f expansion of the 2PI effective action
to next-to-leading order. We show explicitly that the calculation is gauge
fixing independent and consistent with the Ward identity. We find that these
transport coefficients depend in a nontrivial manner on the coupling constant
and fermion mass. For large mass, both the shear viscosity and the electrical
conductivity go to zero.


title: Magnetic Color Flavor Locking Phase in High Density QCD

abstract:
  We investigate the effects of an external magnetic field in the gap structure
of a color superconductor with three massless quark flavors. Using an effective
theory with four-fermion interactions, inspired by one-gluon exchange, we show
that the long-range component $\widetilde{B}$ of the external magnetic field
that penetrates the color-flavor locked (CFL) phase modifies its gap structure,
producing a new phase of lower symmetry. A main outcome of our study is that
the $\widetilde{B}$ field tends to strengthen the gaps formed by
$\widetilde{Q}$-charged and $\widetilde{Q}$-neutral quarks that coupled among
themselves through tree-level vertices. These gaps are enhanced by the
field-dependent density of states of the $\widetilde{Q}$-charged quarks on the
Fermi surface. Our considerations are relevant for the study of highly
magnetized compact stars.


title:
Collider Production of TeV Scale Black Holes and Higher-Curvature
  Gravity

abstract:
  We examine how the production of TeV scale black holes at colliders is
influenced by the presence of Lovelock higher-curvature terms in the action of
models with large extra dimensions. Such terms are expected to arise on rather
general grounds, e.g., from string theory and are often used in the literature
to model modifications to the Einstein-Hilbert action arising from quantum
and/or stringy corrections. While adding the invariant which is quadratic in
the curvature leads to quantitative modifications in black hole properties,
cubic and higher invariants are found to produce significant qualitative
changes, e.g., classically stable black holes. We use these higher-order
curvature terms to construct a toy model of the black hole production cross
section threshold. For reasonable parameter values we demonstrate that detailed
measurements of the properties of black holes at future colliders will be
highly sensitive to the presence of the Lovelock higher-order curvature terms.


title: Chiral freedom and the scale of weak interactions

abstract:
  A second rank antisymmetric tensor field is proposed as an alternative to the
Higgs scalar. No mass term is allowed by the symmetries. At the scale where the
asymptotically free chiral couplings of the fermions grow large, condensates of
top-antitop and bottom-antibottom may induce the spontaneous breaking of the
electroweak gauge symmetry. This would solve the gauge hierarchy problem by
dimensional transmutation, similar to QCD.


title:
The Stau Neutralino Co-annihilation Region at an International Linear
  Collider

abstract:
  We probe the stau-neutralino co-annihilation domain of the parameter space
allowed by the current experimental bounds on the light Higgs mass, the b-> s
\gamma decay, and the amount of neutralino cold dark matter within the
framework of minimal SUGRA models at a 500 GeV e+e- linear collider. The most
favorable signals of SUSY are stau pair production and neutralino pair
production where the small mass difference between the lighter stau and the
lightest neutralino in the co-annihilation region is ~5-15 GeV and hence
generates low-energy tau leptons in the final state. This small mass difference
would be a striking signal of many SUGRA models. We find that a calorimeter
covering down to 1^o from the beams is crucial to reduce the two-photon
background and the mass difference could be measured at a level of 10% with 500
fb^-1 of data where an invariant mass of two-tau jets and missing energy is
used as a discriminator.


title: Spin 3/2 Pentaquarks

abstract:
  We investigate the possible existence of the spin 3/2 pentaquark states using
interpolating currents with K-N color-octet structure in the framework of QCD
finite energy sum rule (FESR). We pay special attention to the convergence of
the operator product expansion.


title:
Split supersymmetry and the role of a light fermion in a
  supergravity-based scenario

abstract:
  We investigate split supersymmetry (SUSY) within a supergravity framework,
where local SUSY is broken by the F-term of a hidden sector chiral superfield
X. With reasonably general assumptions, we show that the fermionic component of
X will always have mass within a Tev. Though its coupling to the observable
sector superfields is highly suppressed in Tev scale SUSY, we show that it can
be enhanced by many orders in split SUSY, leading to its likely participation
in accelerator phenomenology.We conclude with a specific example of such a
scenario in a string based supergravity model.


title: Poincar\'e recurrence theorem and the strong CP-problem

abstract:
  The existence in the physical QCD vacuum of nonzero gluon condensates, such
as $<g^2F^2>$, requires dominance of gluon fields with finite mean action
density. This naturally allows any real number value for the unit ``topological
charge'' $q$ characterising the fields approximating the gluon configurations
which should dominate the QCD partition function. If $q$ is an irrational
number then the critical values of the $\theta$ parameter for which CP is
spontaneously broken are dense in $\mathbb{R}$, which provides for a mechanism
of resolving the strong CP problem simultaneously with a correct implementation
of $U_{\rm A}(1)$ symmetry. We present an explicit realisation of this
mechanism within a QCD motivated domain model. Some model independent arguments
are given that suggest the relevance of this mechanism also to genuine QCD.


title:
One-loop electroweak factorizable corrections for the Higgsstrahlung at
  a linear collider

abstract:
  We present standard model predictions for a four fermion reaction e+ e- ->
mu+ mu- bar_b b being one of the best detection channels of a low mass Higgs
boson produced through the Higgsstrahlung mechanism at a linear collider. We
include leading virtual and real QED corrections to all the lowest order
Feynman diagrams of e+ e- -> mu+ mu- bar_b b and the complete O(alpha)
electroweak corrections to the Z-Higgs production and to the Z and Higgs boson
decay widths in the double pole approximation.


title:
Generalizing the DGLAP Evolution of Fragmentation Functions to the
  Smallest x Values

abstract:
  An approach which unifies the Double Logarithmic Approximation at small x and
the leading order DGLAP evolution of fragmentation functions at large x is
presented. This approach reproduces exactly the Modified Leading Logarithm
Approximation, but is more complete due to the degrees of freedom given to the
quark sector and the inclusion of the fixed order terms. We find that data from
the largest x values to the peak region can be better fitted than with other
approaches.


title:
Full one-loop QCD and electroweak corrections to sfermion pair
  production in $\gamma \gamma$ collisions

abstract:
  We have calculated the full one-loop electroweak (EW) and QCD corrections to
the third generation scalar-fermion pair production processes $e^+e^- \to
\gamma \gamma \to \tilde{f_i}\bar{\tilde{f_i}} (f=t,b,\tau)$ at an
electron-positron linear collider(LC) in the minimal supersymmetric standard
model (MSSM). We analyze the dependence of the radiative corrections on the
parameters such as the colliding energy $\sqrt{\hat s}$ and the SUSY
fundamental parameters $A_f$, $\tan \beta$, $\mu$, $M_{SUSY}$ and so forth. The
numerical results show that the EW corrections to the squark-, stau-pair
production processes and QCD corrections to the squark-pair production
processes give substantial contributions in some parameter space. The EW
relative corrections to squark-pair production processes can be comparable with
QCD corrections at high energies. Therefore, these EW and QCD corrections
cannot be neglected in precise measurement of sfermion pair productions via
$\gamma\gamma$ collision at future linear colliders.


title:
The Anatomy of Electro-Weak Symmetry Breaking. I: The Higgs boson in the
  Standard Model

abstract:
  This review is devoted to the study of the mechanism of electroweak symmetry
breaking and this first part focuses on the Higgs particle of the Standard
Model. The fundamental properties of the Higgs boson are reviewed and its decay
modes and production mechanisms at hadron colliders and at future lepton
colliders are described in detail.


title:
The Anatomy of Electro-Weak Symmetry Breaking. II: The Higgs bosons in
  the Minimal Supersymmetric Model

abstract:
  The second part of this review is devoted to the Higgs sector of the Minimal
Supersymmetric Standard Model. The properties of the neutral and charged Higgs
bosons of the extended Higgs sector are summarized and their decay modes and
production mechanisms at hadron colliders and at future lepton colliders are
reviewed.


title:
A Method to Measure $\phi_1$ Using $\bar{B}^0 \to D h^0$ With Multibody
  $D$ Decay

abstract:
  We describe a new method to measure the angle $\phi_1$ of the CKM
  Unitarity Triangle using amplitude analysis of the multibody decay of the
neutral $D$ meson produced via $\bar{B} \to D h^0$ colour-suppressed decays.
  The method employs the interference between $D^0$ and $\bar{D}^0$ to directly
extract the value of $2\phi_1$, and thus resolve the ambiguity between
$2\phi_1$ and $\pi-2\phi_1$ in the measurement of $\sin(2\phi_1)$ using
$\bar{B}^0 \to J/ \psi \ks$.
  We present a feasibility study of this method using Monte Carlo simulation.


title: Gluino decays with heavier scalar superpartners

abstract:
  We compute gluino decay widths in supersymmetric theories with arbitrary
flavor and CP violation angles. Our emphasis is on theories with scalar
superpartner masses heavier than the gluino such that tree-level two-body
decays are not allowed, which is relevant, for example, in split supersymmetry.
We compute gluino decay branching fractions in several specific examples and
show that it is plausible that the only accessible signal of supersymmetry at
the LHC could be four top quarks plus missing energy. We show another example
where the only accessible signal for supersymmetry is two gluon jets plus
missing energy.


title: The Critical Endpoint of Bootstrap and Lattice QCD Matter

abstract:
  The critical sector of strong interactions at high temperatures is explored
in the frame of two complementary approaches: Statistical Bootstrap for the
hadronic phase and Lattice QCD for the Quark-Gluon partition function. A region
of thermodynamic instability of hadronic matter was found, as a direct
prediction of Statistical Bootstrap. As a result, critical endpoint solutions
for nonzero chemical potential were traced in the phase diagram of strongly
interacting matter. These solutions are compared with recent lattice QCD
results and their proximity to the freeze-out points of experiments with nuclei
at high energies is also discussed.


title: An Introduction to Extra Dimensions

abstract:
  Models that involve extra dimensions have introduced completely new ways of
looking up on old problems in theoretical physics. The aim of the present notes
is to provide a brief introduction to the many uses that extra dimensions have
found over the last few years, mainly following an effective field theory point
of view. Most parts of the discussion are devoted to models with flat extra
dimensions, covering both theoretical and phenomenological aspects. We also
discuss some of the new ideas for model building where extra dimensions may
play a role, including symmetry breaking by diverse new and old mechanisms.
Some interesting applications of these ideas are discussed over the notes,
including models for neutrino masses and proton stability. The last part of
this review addresses some aspects of warped extra dimensions, and graviton
localization.


title:
Black holes in many dimensions at the LHC: testing critical string
  theory

abstract:
  We consider black hole production at the LHC in a generic scenario with many
extra dimensions where the Standard Model fields are confined to a brane. With
$\sim 20$ dimensions the hierarchy problem is shown to be naturally solved
without the need for large compactification radii. We find that in such a
scenario the properties of black holes can be used to determine the number of
extra dimensions, $n$. In particular, we demonstrate that measurements of the
decay distributions of such black holes at the LHC can determine if $n$ is
significantly larger than 6 or 7 with high confidence, and thus can probe one
of the critical properties of string theory compactifications.


title: Minimal gauge-Higgs unification with a flavour symmetry

abstract:
  We show that a flavour symmetry a la Froggatt-Nielsen can be naturally
incorporated in models with gauge-Higgs unification, by exploiting the heavy
fermions that are anyhow needed to realize realistic Yukawa couplings. The case
of the minimal five-dimensional model, in which the SU(2)_L x U(1)_Y
electroweak group is enlarged to an SU(3)_W group, and then broken to U(1)_em
by the combination of an orbifold projection and a Scherk-Schwarz twist, is
studied in detail. We show that the minimal way of incorporating a U(1)_F
flavour symmetry is to enlarge it to an SU(2)_F group, which is then completely
broken by the same orbifold projection and Scherk-Schwarz twist. The general
features of this construction, where ordinary fermions live on the branes
defined by the orbifold fixed-points and messenger fermions live in the bulk,
are compared to those of ordinary four-dimensional flavour models, and some
explicit examples are constructed.


title:
Angular distribution of radiation by relativistic electrons in a thin
  crystal

abstract:
  The results of theoretical investigation of angular distributions of
radiation from a relativistic electron passing through a thin crystal at a
small angle to the crystal axis are presented. The electron trajectories in
crystal were simulated using the binary collision model which takes into
account both coherent and incoherent effects at scattering. The angular
distribution of radiation was calculated as a sum of radiation from each
electron. It is shown that there are nontrivial angular distributions of the
emitted photons, which is connected to the superposition of the coherent
scattering of electrons by atomic rows (doughnut scattering effect) and the
suppression of the radiation due to the multiple scattering effect (similar to
the Landau-Pomeranchuk-Migdal effect in an amorphous matter). The orientation
dependence of angular distribution of radiation is also analyzed.


title: Energy Conservation and Saturation in Small-x Evolution

abstract:
  Important corrections to BFKL evolution are obtained from non-leading
contributions and from non-linear effects due to unitarisation or saturation.
It has been difficult to estimate the relative importance of these effects, as
NLO effects are most easily accounted for in momentum space while unitarisation
and saturation are easier in transverse coordinate space. An essential
component of the NLO contributions is due to energy conservation effects, and
in this paper we present a model for implementing such effects together with
saturation in Mueller's dipole evolution formalism. We find that energy
conservation severely dampens the small-x rise of the gluon density and, as a
consequence, the onset of saturation is delayed. Using a simple model for the
proton we obtain a reasonable qualitative description of the x-dependence of F2
at low Q^2 as measured at HERA even without saturation effects. We also give
qualitative descriptions of the energy dependence of the cross section for
gamma*-gamma* and gamma*-nucleus scattering.


title: Impact parameter profile of synchrotron radiation

abstract:
  The horizontal impact parameter profile of synchrotron radiation, for fixed
vertical angle of the photon, is calculated. This profile is observed through
an astigmatic optical system, horizontally focused on the electron trajectory
and vertically focused at infinity. It is the product of the usual angular
distribution of synchrotron radiation, which depends on the vertical angle
$\psi$, and the profile function of a caustic staying at distance $\bcl =
(\gamma^{-2} + \psi^2) \RB/2 $ from the orbit circle, $\RB$ being the bending
radius and $\gamma$ the Lorentz factor. The {\it classical impact parameter}
$\bcl$ is connected to the Schott term of radiation damping theory. The caustic
profile function is an Airy function squared. Its fast oscillations allow a
precise determination of the horizontal beam width.


title:
The effects of large extra dimensions on associated $t\bar{t} h^0$
  production at linear colliders

abstract:
  In the framework of the large extra dimensions (LED) model, the effects of
LED on the processes \rrtth and \eetth at future linear colliders are
investigated in both polarized and unpolarized collision modes. The results
show that the virtual Kaluza-Klein (KK) graviton exchange can significantly
modify the standard model expectations for these processes with certain
polarizations of initial states. The process \rrtth with $\sqrt{s}=3.5 TeV$
allows the effective scale $\Lambda_T$ to be probed up to 7.8 and 8.6 TeV in
the unpolarized and $P_{\gamma} = 0.9$, J=2 polarized $\gamma \gamma$ collision
modes, respectively. For the \eetth process with $\sqrt{s}=3.5 TeV$, the upper
limits of $\Lambda_T$ to be observed can be 6.7 and 7.0 TeV in the unpolarized
and $P_{e^+} = 0.6$, $P_{e^-} = 0.8$, $-+$ polarized $e^+e^-$ collision modes,
respectively. We find the \rrtth channel in J=2 polarized photon collision mode
provides a possibility to improve the sensitivity to the graviton tower
exchange.


title:
The phase diagram of neutral quark matter: Self-consistent treatment of
  quark masses

abstract:
  We study the phase diagram of dense, locally neutral three-flavor quark
matter within the framework of the Nambu--Jona-Lasinio model. In the analysis,
dynamically generated quark masses are taken into account self-consistently.
The phase diagram in the plane of temperature and quark chemical potential is
presented. The results for two qualitatively different regimes, intermediate
and strong diquark coupling strength, are presented. It is shown that the role
of gapless phases diminishes with increasing diquark coupling strength.


title:
Indication of asymptotic scaling in the reactions $dd\to p^3$H, $dd\to
  n^3$He and $dp\to dp$

abstract:
  It is shown that the differential cross sections of the reactions $dd\to ^3He
n$ and $dd\to ^3H p$ measured at c.m.s.scattering angle$\theta_{cm}=60^\circ$
in the interval of the deuteron beam energy 0.5 - 1.2 GeV demonstrate the
scaling behaviour,$d\sigma/d t\sim s^{-22}$, which follows from constituent
quark counting rules. It is found also that the differential cross section of
the elastic $dp\to dp$ scattering at $\theta_{cm}=125^\circ-135^\circ$ follows
the scaling regime $\sim s^{-16}$ at beam energies 0.5 - 5 GeV. These data are
parameterized here using the Reggeon exchange.


title: The Origin of a Peculiar Extra U(1)

abstract:
  The origin of a family-independent "extra U(1)", discovered by Barr, Bednarz,
and Benesh and independently by Ma, and whose phenomenology has recently been
studied by Ma and Roy, is discussed. Even though it satisfies anomaly
constraints in a highly economical way, with just a single extra triplet of
leptons per family, this extra U(1) cannot come from four-dimensional grand
unification. However, it is shown here that it can come from a Pati-Salam
scheme with an extra U(1), which explains the otherwise surprising cancellation
of anomalies.


title: High-energy limit of neutrino quasielastic cross section

abstract:
  It's a common knowledge that the quasielastic neutrino-neutron and
antineutrino-proton cross sections tend to the same constant as (anti)neutrino
energy becomes high. In this paper we calculate the exact expression of the
limit in terms of the parameters describing quasielastic scattering. We check
that even at very high energies only small absolute values of the four-momentum
transfer contribute to the cross section, hence the Fermi theory can be
applied. The dipole approximation of the form factors allows to perform
analytic calculations. Obtained results are neutrino-flavour independent.


title:
Analytic Continuation of the Harmonic Sums for the 3--Loop Anomalous
  Dimensions

abstract:
  We present for numerical use the analytic continuations to complex arguments
of those basic Mellin transforms, which build the harmonic sums contributing to
the 3--loop anomalous dimensions. Eight new basic functions contribute in
addition to the analytic continuations for the 2--loop massless Wilson
coefficients calculated previously. The representations derived have a relative
accuracy of better than $10^{-7}$ in the range $x \epsilon [10^{-6},0.98]$.


title: Final State of Hawking Radiation in Quantum General Relativity

abstract:
  We use a new approach to the UV behavior of quantum general relativity,
together with some recent results from the phenomenological asymptotic safety
analysis of the theory, to discuss the final state of the Hawking radiation for
an originally very massive black hole solution of Einstein's theory. We find
that, after the black hole evaporates to the Planck mass size, its horizon is
obviated by quantum loop effects, rendering the entire mass of the originally
massive black hole accessible to our universe.


title: Hidden LocaL Symmetry Theory as an Effective Field Theory of QCD

abstract:
  In this write-up, I summarize the recent development of the hidden local
symmetry (HLS) theory as an effective field theory of QCD. I first explain how
the systematic chiral perturbation in the HLS is justified in the large Nc
limit of QCD, and summarize the basic concept of the Wilsonian matching,
through which some of the bare parameters of the HLS are determined by matching
the HLS to the operator product expansion in QCD. Then, I briefly review how to
formulate the vector manifestation in hot matter.


title: Studies on Chargino production and decay at a photon collider

abstract:
  A Monte-Carlo analysis on production and decay of supersymmetric charginos at
a future photon-collider is presented. A photon collider offers the possibility
of a direct branching-ratio measurement. In this study, the process gamma,gamma
-> chi_1^+,chi_1^- -> W+W-chi_1^0chi_1^0 -> 4-jets,chi_1^0chi_1^0 has been
considered for a specific mSUGRA scenario. Various backgrounds and
parameterised detector simulation have been included. Depending on the
centre-of-mass energy, a statistical error for the directly measurable
branching ratio BR(chi}_1^+ ->chi}_1^0 W^+) of up to 3.5% can be reached.


title: Dynamically Induced Spontaneous Symmetry Breaking in 3-3-1 Models

abstract:
  We show that in SU(3)_C X SU(3)_L X U(1)_N (3-3-1) models embedded with a
singlet scalar playing the role of the axion, after imposing scale invariance,
dynamical symmetry breaking of Peccei-Quinn symmetry occurs through the
one-loop effective potential for the singlet field. We, then, analyze the
structure of spontaneous symmetry breaking by studying the new scalar potential
for the model, and verify that electroweak symmetry breaking is tightly
connected to the 3-3-1 breaking by the strong constraints among their vacuum
expectation values. This offers a valuable guide to write down the correct
pattern of symmetry breaking for multi-scalar theories. We also obtained that
the accompanying massive pseudo-scalar, instead of acquiring mass of order of
Peccei-Quinn scale as we would expect, develops a mass at a much lower scale, a
consequence solely of the dynamical breaking.


title: Pentaquark Decay Width in QCD Sum Rules

abstract:
  In a diquark-diquark-antiquark picture of the pentaquark we study the decay
$\Theta \rightarrow K^{+} n$ within the framework of QCD sum rules. After
evaluation of the relevant three-point function, we extract the coupling
$g_{\Theta nK}$ which is directly related to the pentaquark width. Restricting
the decay diagrams to those with color exchange between the meson-like and
baryon-like clusters reduces the coupling constant by a factor of four. Whereas
a small decay width might be possible for a positive parity pentaquark, it
seems difficult to explain the measured width for a pentaquark with negative
parity.


abstract:
  The phase diagram of three-flavor quark matter under compact star constraints
is investigated within a Nambu--Jona-Lasinio model. Local color and electric
charge neutrality is imposed for beta-equilibrated superconducting quark
matter. The constituent quark masses and the diquark condensates are determined
selfconsistently in the plane of temperature and quark chemical potential. Both
strong and intermediate diquark coupling strengths are considered. We show that
in both cases, gapless superconducting phases do not occur at temperatures
relevant for compact star evolution, i.e., below T ~ 50 MeV. The stability and
stucture of isothermal quark star configurations are evaluated. For
intermediate coupling, quark stars are composed of a mixed phase of normal (NQ)
and two-flavor superconducting (2SC) quark matter up to a maximum mass of 1.21
M_sun. At higher central densities, a phase transition to the three-flavor
color flavor locked (CFL) phase occurs and the configurations become unstable.
For the strong diquark coupling we find stable stars in the 2SC phase, with
masses up to 1.326 M_sun. A second family of more compact configurations
(twins) with a CFL quark matter core and a 2SC shell is also found to be
stable. The twins have masses in the range 1.301 ... 1.326 M_sun. We consider
also hot isothermal configurations at temperature T=40 MeV. When the hot
maximum mass configuration cools down, due to emission of photons and
neutrinos, a mass defect of 0.1 M_sun occurs and two final state configurations
are possible.


title:
Model dependent analyses on the $N_c$ dependence of the $\sigma$ pole
  trajectory

abstract:
  We explore the nature of the$\sigma$ or $f_0(600)$ meson using large $N_c$
technique, assuming that the $\sigma$ pole dominates low energy physics in the
IJ=00 channel. We trace the $N_c$ dependence of the $\sigma$ pole position
using [1,1] Pad\'e approximation of SU(3) chiral amplitude, [1,2] Pad\'e
approximation of SU(2) chiral amplitudes, and the PKU parametrization form. We
find that in all 3 cases the $\sigma$ pole moves to the real axis of the
complex $s$-plane. Finally we construct a pedagogical example using the SU(2)
Pad\'e amplitude to show that when the analyticity property of the scattering
amplitude is violated, it is possible that the $\sigma$ pole resides on the
complex $s$ plane when $N_c$ is large.


title: Mass relations among family members of quarks and leptons

abstract:
  The various mass relations among members of quark and lepton families are
given. Three mass relations for the charm, beauty, and top quark family members
are given and three mass relations for the electron, muon, and tau lepton
family members are presented.


title: Lepton mixing and seesaw mechanism

abstract:
  In the context of a typical model for fermion mass matrices, possibly based
on the horizontal U(2) symmetry, we explore the effect of the type II seesaw
mechanism on lepton mixings. We find that the combined contribution of type I
and type II terms is able to explain the large but not maximal 1-2 mixing and
the near maximal 2-3 mixing, while the 1-3 mixing angle is predicted to be
small.


title: Renormalizability of the massive Yang-Mills theory

abstract:
  It is shown that the massive Yang-Mills theory is on mass-shell
renormalizable. Thus the Standard Model of electroweak interactions can be
modified by removing terms with the scalar field from the Lagrangian in the
unitary gauge. The resulting electroweak theory without the Higgs particle is
on mass-shell renormalizable and unitary.


title:
The quark mixing matrix with manifest Cabibbo substructure and an angle
  of the unitarity triangle as one of its parameters

abstract:
  The quark mixing matrix is parameterised such that its "Cabibbo substructure"
is emphasised. One can choose one of the parameters to be an arbitrarily chosen
angle of the unitarity triangle, for example the angle $\beta$ (also called
$\Phi_1$).


title: Nontrivial Correlation between the CKM and MNS Matrices

abstract:
  We point out that the Cabibbo-Kobayashi-Maskawa (CKM) quark mixing matrix
$V_{\rm CKM}$ and the Maki-Nakagawa-Sakata (MNS) lepton mixing matrix $V_{\rm
MNS}$ can naturally be correlated in a class of seesaw models with grand
unification, but the texture of their correlation matrix ${\cal F}_\nu$ is
rather nontrivial. The bimaximal mixing pattern of ${\cal F}_\nu$ is disfavored
by current data, and other special forms of ${\cal F}_\nu$ may suffer from
fine-tuning of the free phase parameters in fitting the so-called quark-lepton
complementarity relation. A straightforward calculation of ${\cal F}_\nu$ in
terms of $V_{\rm CKM}$ and $V_{\rm MNS}$ reveals a striking feature of ${\cal
F}_\nu$: its (1,3) element cannot be zero or too small, no matter whether the
(1,3) elements of $V_{\rm CKM}$ and $V_{\rm MNS}$ are vanishing or not. We also
add some brief comments on possible radiative corrections to $V_{\rm CKM}$ and
$V_{\rm MNS}$.


title:
Non-thermal Leptogenesis and a Prediction of Inflaton Mass in a
  Supersymmetric SO(10) Model

abstract:
  The gravitino problem gives a severe constraint on the thermal leptogenesis
scenario. This problem leads us to consider some alternatives to it if we try
to keep the gravitino mass around the weak scale $m_{3/2} \sim 100$ GeV. We
consider, in this paper, the non-thermal leptogenesis scenario in the framework
of a minimal supersymmetric SO(10) model. Even if we start with the same
minimal SO(10) model, we have different predictions for low-energy
phenomenologies dependent on the types of seesaw mechanism. This is the case
for leptogenesis: it is shown that the type-I see-saw model gives a consistent
scenario for the non-thermal leptogenesis but not for type-II. The predicted
inflaton mass needed to produce the observed baryon asymmetry of the universe
is found to be $M_I \sim 5 \times 10^{11}$ GeV for the reheating temperature
$T_R = 10^6$ GeV.


title:
Remarks to the Standard Theory of Neutrino Oscillations. Corrected
  Theory of Neutrino Oscillations

abstract:
  In the Standard theory of neutrino oscillations it is supposed that physical
observed neutrino states $\nu_{e}, \nu_{\mu}, \nu_{\tau}$ have no definite
masses and that neutrinos are initially created as mixture of $\nu_{1},
\nu_{2}, \nu_{3}$ neutrino states and that neutrino oscillations are the real
ones even when neutrino masses are different. It is shown that these
suppositions lead to violation of the law of energy and momentum conservation
and then the neutrino states are unstable ones and they must disintegrate. Then
the development of the standard theory of neutrino oscillations in the
framework of particle physics is considered where the above mentioned
shortcomings are absent and the oscillations of neutrino with equal masses are
real ones and the oscillations of neutrino different masses are virtual ones.
Expressions for probabilities of neutrino transitions (oscillations) in the
correct theory are given.


title: Difficult Scenarios for NMSSM Higgs Discovery at the LHC

abstract:
  We identify scenarios not ruled out by LEP data in which NMSSM Higgs
detection at the LHC will be particularly challenging. We first review the
`no-lose' theorem for Higgs discovery at the LHC that applies if Higgs bosons
do not decay to other Higgs bosons - namely, with L=300 fb^-1, there is always
one or more `standard' Higgs detection channel with at least a 5 sigma signal.
However, we provide examples of no-Higgs-to-Higgs cases for which all the
standard signals are no larger than 7 sigma implying that if the available L is
smaller or the simulations performed by ATLAS and CMS turn out to be overly
optimistic, all standard Higgs signals could fall below 5 sigma even in the
no-Higgs-to-Higgs part of NMSSM parameter space. In the vast bulk of NMSSM
parameter space, there will be Higgs-to-Higgs decays. We show that when such
decays are present it is possible for all the standard detection channels to
have very small significance. In most such cases, the only strongly produced
Higgs boson is one with fairly SM-like couplings that decays to two lighter
Higgs bosons (either a pair of the lightest CP-even Higgs bosons, or, in the
largest part of parameter space, a pair of the lightest CP-odd Higgs bosons). A
number of representative bench-mark scenarios of this type are delineated in
detail and implications for Higgs discovery at various colliders are discussed.


title: Non-extensive Boltzmann Equation and Hadronization

abstract:
  For a general, associative addition rule defining a non-extensive
thermodynamics we construct the strict monotonic function, which transforms it
to an additive quantity. We investigate the evolution of one-particle
distributions in the framework of a two-body Boltzmann equation supported with
a non-extensive energy addition rule. In particular we study the emergence of a
Tsallis distribution as a stationary solution. We propose that for describing
the hadronization of quark matter non-extensive rules may apply.


title: The Role of hidden ambiguities in the Linear Sigma Model with fermions

abstract:
  The $U_L(3)\times U_R(3)$ Linear Sigma Model (LSM) with quark degrees of
freedom is used to show that radiative corrections generate undetermined finite
contributions. Their origin is related to surface terms which are differences
between divergent integrals with the same degree of divergence. The technique
used to detect these ambiguities is an implicit regularization on basic
divergent integrals that do not depend on external momenta. We show that such
contributions are absorbed by renormalization or fixed by symmetry
requirements. The general expression for surface terms is derived.
Renormalization group coefficients are calculated, as well as relevant
observables for this model, such as $f_{\pi}$, $f_k$ and the pion and kaon form
factors.


title: Analogy between free electron laser and channeling by crystal planes

abstract:
  The trapping of electrons in the ponderomotive potential wells, which governs
a free electron laser or inverse free electron laser at high gain, is analogous
to the channeling of charged particles by atomic planes of a crystal. A bent
crystal is analogous to a period-tapered free electron laser. This analogy is
different from the well-known one between channeling and undulator radiations.


title:
A new determination of the $\gamma \pi \to \pi\pi$ anomalous amplitude
  via $\pi^- e^- \to \pi^- e^- \pi^{0}$ data

abstract:
  We discuss the reaction $\pi^- e^- \to \pi^- e^- \pi^{0}$ with the purpose of
obtaining information on the $\gamma \pi \to \pi\pi$ anomalous amplitude ${\cal
F}_{3\pi}$. We compare a full calculation at ${\cal O}(p^6)$ in chiral
perturbation theory and various phenomenological predictions with the existing
data of Amendolia {\em et al}. By integrating our theory results using Monte
Carlo techniques we obtain $\sigma= 2.05 $ nb at ${\cal O}(p^6)$ and $\sigma=
2.17 $ nb after including the dominant electromagnetic correction. Both results
are in good agreement with the experimental cross section of $\sigma= (2.11 \pm
0.47)$ nb. On the basis of the ChPT results one would extract from the the
experimental cross section as amplitudes ${\cal F}_{3\pi}^{(0)\rm extr} = (9.9
\pm 1.1)$ GeV$^{-3}$ and ${\cal F}_{3\pi}^{(0)\rm extr} = (9.6 \pm 1.1)$
GeV$^{-3}$, respectively, which have to be compared with the low-energy theorem
${\cal F}_{3\pi}=e/(4\pi^2 F_\pi^3)=9.72 {GeV}^{-3}$. We emphasize the need for
new data to allow for a comparison of experimental and theoretical
distributions and to obtain ${\cal F}_{3\pi}$ with smaller uncertainty.


title: Aspects of the Stueckelberg Extension

abstract:
  A detailed analysis of a Stueckelberg extension of the electro-weak gauge
group with an extra U(1) factor is presented for the Standard Model as well as
for the MSSM. The extra gauge boson gets massive through a Stueckelberg type
coupling to a pseudo-scalar, instead of a Higgs effect. This new massive
neutral gauge boson Z' has vector and axial vector couplings uniquely different
from those of conventional extra abelian gauge bosons, such as appear e.g. in
GUT models. The extended MSSM furthermore contains two extra neutralinos and
one extra neutral CP-even scalar, the latter with a mass larger than that of
the Z'. One interesting scenario that emerges is an LSP that is dominantly
composed out of the new neutralinos, leading to a possible new superweak
candidate for dark matter. We investigate signatures of the Stueckelberg
extension at a linear collider and discuss techniques for the detection of the
expected sharp Z' resonance. It turns out that the substantially modified
forward-backward asymmetry around the Z' pole provides an important signal.
Furthermore, we also elaborate on generalizations of the minimal Stueckelberg
extension to an arbitrary number of extra U(1) gauge factors.


title:
High-precision epsilon expansions of single-mass-scale four-loop vacuum
  bubbles

abstract:
  In this article we present a high-precision evaluation of the expansions in
$\e=(4-d)/2$ of (up to) four-loop scalar vacuum master integrals, using the
method of difference equations developed by S. Laporta. We cover the complete
set of `QED-type' master integrals, i.e. those with a single mass scale only
(i.e. $m_i\in\{0,m\}$) and an even number of massive lines at each vertex.
Furthermore, we collect all that is known analytically about four-loop
`QED-type' masters, as well as about {\em all} single-mass-scale vacuum
integrals at one-, two- and three-loop order.


title: Dark Energy as an Inverse Problem

abstract:
  A model--independent approach to dark energy is here developed by considering
the determination of its equation of state as an inverse problem. The
reconstruction of w(z) as a non--parametric function using the current SNe Ia
data is explored. It is investigated as well how results would improve when
considering other samples of cosmic distance indicators at higher redshift.
This approach reveals the lack of information in the present samples to
conclude on the behavior of w(z) at z > 0.6. At low level of significance a
preference is found for w_{0} < -1 and w'(z) > 0 at z ~ 0.2--0.3. The solution
of w(z) along redshift never departs more than 1.95\sigma from the cosmological
constant w(z)=-1, and this only occurs when using various cosmic distance
indicators. The determination of w(z) as a function is readdressed considering
samples of large number of SNe Ia as those to be provided by SNAP. It is found
an improvement in the resolution of w(z) when using those synthetic samples,
which is favored by adding data at very high z. Though the set of degenerate
solutions compatible with the data can be retrieved through this method, these
degeneracies in the solution will difficult the physical interpretation of the
results. Through this approach, we have explored as well the gain in
information in w(z) and the quality of the inversion achieved using different
data sets of cosmic distance indicators.


title: Electroweak Baryogenesis with Embedded Domain Walls

abstract:
  We consider electroweak baryogenesis mediated by embedded domain walls.
Embedded domain walls originating from a symmetry breaking phase transition are
stabilized by thermal plasma effects, so that the electroweak symmetry is
unbroken in their cores. For this reason, the cosmological evolution of such
domain walls can generate a sufficiently large baryon asymmetry, irrespective
of the order of the electroweak phase transition. For embedded domain walls,
the condition that the energy of the universe not be dominated by the energy of
the domain walls is relaxed significantly, and it is shown to be compatible
with our scenario of electroweak baryogenesis.


title: Local Thermalization in the d + Au System

abstract:
  The extent of a locally equilibrated parton plasma in d + Au collisions at
sqrt(s_NN) = 200 GeV is investigated as a function of collision centrality in a
nonequilibrium-statistical framework. Based on a three-sources model,
analytical solutions of a relativistic diffusion equation are in precise
agreement with recent data for charged-particle pseudorapidity distributions.
The moving midrapidity source indicates the size of the local thermal
equilibrium region after hadronization. In central d + Au collisions it
contains about 19% of the produced particles, and its relative importance rises
with decreasing centrality.


title: A topological model of composite preons

abstract:
  We describe a simple model, based on the preon model of Shupe and Harari, in
which the binding of preons is represented topologically. We then demonstrate a
direct correspondence between this model and much of the known phenomenology of
the Standard Model. In particular we identify the substructure of quarks,
leptons and gauge bosons with elements of the braid group $B_3$. Importantly,
the preonic objects of this model require fewer assumed properties than in the
Shupe/Harari model, yet more emergent quantities, such as helicity,
hypercharge, and so on, are found. Simple topological processes are identified
with electroweak interactions and conservation laws. The objects which play the
role of preons in this model may occur as topological structures in a more
comprehensive theory, and may themselves be viewed as composite, being formed
of truly fundamental sub-components, representing exactly two levels of
substructure within quarks and leptons.


title:
The deuteron (nuclei) birefringence effect in a matter and in an
  electric field and the searches for an EDM of a deuteron (nucleus) rotating
  in a storage ring

abstract:
  The phenomena of deuteron birefringence in a matter and an electric field
should be accurately considered when preparing experiments for the EDM search
with a storage ring, because they could imitate the spin rotation due to the
EDM. Moreover, study of these effects in such experiments could provide to
measure both the spin-dependent part of the amplitude of the coherent elastic
scattering of a deuteron by a nucleus at the zero angle and the tensor electric
polarizability of a deuteron.


title: The Femto-experiment for the LHC: The W-boson beams and their targets

abstract:
  The LHC has been designed as a collider of proton and ion beams. However, in
its experimental program, which is focused mainly on studies of high energy
transfer collisions of Standard Model point-like particles, protons and ions
will play a backstage role. For the majority of the LHC experimentalists, their
role will be confined to providing standardized, acceleration-process-stable
envelopes for tunable-density and tunable-isospin bunches of Standard Model
constituents: quarks and gluons. The inter-bunch environment of collisions of
these Standard Model particles specific to hadronic colliders and absent in the
leptonic ones, has always been considered as a burden - an annoying but
unavoidable price to pay for increasing the collision-energy of point-like
particles in the storage rings. In this paper we shall argue that such a burden
can be converted into an important merit of the high-energy hadronic colliders
- a corner-stone for a fermi-length-scale ``collision-experiment'' employing
the bunches of spectator quarks and gluons as tunable ``femtoscopic'' targets
for the beams of short-living electroweak bosons.


title: Probing extra dimensions through the invisible Higgs decay

abstract:
  In the large extra dimension model of Arkani-Hamed, Dimopoulos and Dvali the
presence of an interaction between the Ricci scalar curvature and the Higgs
doublet of the Standard Model makes a light Higgs boson observable at LHC at
the 5 sigma level through the fusion process pp-> W*W* +X -> Higgs,
graviscalars +X -> invisible+X for the portion of the Higgs-graviscalar mixing
(xi) and effective Planck mass (M_D) parameter space where channels relying on
visible Higgs decays fail to achieve a 5 sigma signal. However even if the LHC
has a good chance of seeing a signal, it will not be able to determine the
parameters of the model with any real precision.
  This goal can be reached by adding the following LC measurements:
gamma+missing E_T, Higgs production and decay in the visible SM-like final
states and in the invisible final state.


title: The small mixing angle $\theta_{13}$ and the lepton asymmetry

abstract:
  We present the correlation of low energy CP phases, both Dirac and Majorana,
and the lepton asymmetry for the baryon asymmetry in the universe, with a
certain class of Yukawa matrices that consist of two right-handed neutrinos and
include one texture zero in themselves. For cases in which the amount of the
lepton asymmetry $Y_L$ turns out to be proportional to $\theta_{13}^2$, we
consider the relation between two types of CP phases and the relation of $Y_L$
versus the Jarlskog invariant or the amplitude of neutrinoless double beta
decay as $\theta_{13}$ varies.


title:
Geometric structures in hadronic cores of extensive air showers observed
  by KASCADE

abstract:
  The geometric distribution of high-energy hadrons >100 GeV in shower cores
measured with the KASCADE calorimeter is analyzed. The data are checked for
sensitivity to hadronic interaction features and indications of new physics as
discussed in the literature. The angular correlation of the most energetic
hadrons and in particular the fraction of events with hadrons being aligned are
quantified by means of the commonly used parameter lambda_4. The analysis shows
that the observed lambda_4 distribution is compatible with that predicted by
simulations and is not linked to an angular correlation from hadronic jet
production at high energy. Another parameter, d_4^max, describing distances
between hadrons measured in the detector, is found to be sensitive both to the
transverse momenta in secondary hadron production and the primary particle
type. Transverse momenta in high-energy hadron interactions differing by a
factor two or more from what is assumed in the standard simulations are
disfavoured by the measured d_4^max distribution.


title: A classical Odderon in QCD at high energies

abstract:
  We show that the weight functional for color sources in the classical theory
of the Color Glass Condensate includes a term which generates Odderon
excitations. Remarkably, the classical origin of these excitations can be
traced to the random walk of partons in the two dimensional space spanned by
the SU(3) Casimirs. This term is naturally suppressed for a large nucleus at
high energies.


title: CPT Symmetry and The Equality of Mass and Lifetime

abstract:
  CPT theorem has been known to imply the equality of mass and lifetime between
particle and antiparticle even if C(charge conjugation) symmetry is violated.
However, its mathematical verification is insufficient and limited as it
considers only one type of C violation. Here C, not CPT, symmetry will be shown
to imply the equality of mass and coupling constants and the lifetime could be
the same regardless of C and CPT violation. And we conclude that the equality
of mass and lifetime is prerequisite for the CPT theorem to be valid and it is
not implied by CPT symmetry.


title: Jet quenching in relativistic heavy ion collisions

abstract:
  Parton propagation in dense nuclear matter results in elastic, inelastic and
coherent multiple soft scattering with the in-medium color charges. Such
scattering leads to calculable modifications of the hadron production cross
section that is evaluated in the framework of the perturbative QCD
factorization approach. Final state medium-induced gluon bremsstrahlung is
arguably the most efficient way of suppressing large transverse momentum
particle production in nucleus-nucleus collisions. The observed hadronic
attenuation, known as jet quenching, can be related to the properties of the
medium, such as density and temperature, and carries valuable information about
the early stages of heavy ion reactions. Non-Abelian energy loss in the
quark-gluon plasma can be studied in much greater detail through the
modification of the two particle back-to-back correlations. Perturbative
calculations give good description of the redistribution of the lost energy in
lower transverse momentum particles and predict significant increase of the
correlation width of away-side di-hadrons. In contrast, energy loss in cold
nuclear matter was found to be small but for large values of Feynman-x is
expected to complement the dynamical higher twist shadowing in experimentally
observable forward rapidity hadron suppression.


title: Cabibbo Haze in Lepton Mixing

abstract:
  Quark-lepton unification suggests Cabibbo-sized effects in lepton mixings,
which we call Cabibbo haze. We give simple examples and explore possible
Wolfenstein-like parametrizations of the MNSP matrix which incorporate leptonic
Cabibbo shifts. We find that the size of the CHOOZ angle is not always
correlated with the observability of CP violation.


title:
Algebraic models for the hierarchy structure of evolution equations at
  small x

abstract:
  We explore several models of QCD evolution equations simplified by
considering only the rapidity dependence of dipole scattering amplitudes, while
provisionally neglecting their dependence on transverse coordinates. Our main
focus is on the equations that include the processes of pomeron splittings. We
examine the algebraic structures of the governing equation hierarchies, as well
as the asymptotic behavior of their solutions in the large-rapidity limit.