title: Breakdown of QCD factorization at large Feynman x

abstract:
  Recent measurements by the BRAHMS collaboration of high-pT hadron production
at forward rapidities at RHIC found the relative production rate(d-Au)/(p-p) to
be suppressed, rather than enhanced. Examining other known reactions (forward
production of light hadrons, the Drell-Yan process, heavy flavor production,
etc.), one notes that all of these display a similar property, namely, their
cross sections in nuclei are suppressed at large xF. Since this is the region
where x2 is minimal, it is tempting to interpret this as a manifestation of
coherence, or of a color glass condensate, whereas it is actually a simple
consequence of energy conservation and takes place even at low energies. We
demonstrate that in all these reactions there is a common suppression mechanism
that can be viewed, alternatively, as a consequence of a reduced survival
probability for large rapidity gap processes in nuclei, Sudakov suppression, an
enhanced resolution of higher Fock states by nuclei, or an effective energy
loss that rises linearly with energy. Our calculations agree with data.


title:
Two-flavor condensates in chiral dynamics: temperature and isospin
  density effects

abstract:
  Isospin density and thermal corrections for several condensates are
discussed, at the one-loop level, in the frame of chiral dynamics with pionic
degrees of freedom. The evolution of such objects give an additional insight
into the condensed-pion phase transition, that occurs basically when
$|\mui|>m_\pi$, being $|\mui|$ the isospin chemical potential. Calculations are
done in both phases, showing a good agreement with lattice results for such
condensates.


title:
What is the Cosmological Significance of a Discovery of Wimps at
  Colliders or in Direct Experiments?

abstract:
  Although a discovery of wimps either at colliders or in direct experiments
would have enormous implications for our understanding of particle physics, it
would imply less than one would like about our understanding of the dark matter
in the universe or in the galactic halo: it surely is possible that the
discovered particles account for only a little of the total dark matter. To
establish the cosmological significance of a wimp discovery, their density must
be determined. We show that data from neither hadron colliders nor direct
detection experiments alone can be sufficient to determine the local or relic
density of discovered wimps, even allowing all needed assumptions about
cosmology and astrophysics. We provide examples of dark matter models where
nearly identical detector or collider signals correspond to very different
densities. We show, however, that it may be possible to determine the density
of wimps by combining data from both experiments; we present a general method
to do this in the case of supersymmetric dark matter, and describe how similar
studies could be made for other wimp candidates.


title: Polarization effects in the non-linear Compton scattering

abstract:
  We consider emission of a photon by an electron in the field of a strong
laser wave. A probability of this process for circularly or linearly polarized
laser photons and for arbitrary polarization of all other particles is
calculated. We obtain the complete set of functions which describe such a
probability in a compact invariant form. Besides, we discuss in some detail the
polarization effects in the kinematics relevant to the problem of electron to
photon conversion at photon-photon and electron-photon colliders.


title: Orbifold Unification for the Gauge and Higgs Fields and Their Couplings

abstract:
  We present an orbifold GUT model in which the NMSSM Higgs trilinear couplings
are unified with the three Standard Model gauge couplings. The model is
constructed as an N=2 supersymmetric SU(8) gauge theory in six dimensions,
which is reduced to the NMSSM with extra U(1) factors upon compactification.
Such an unification is in good agreement with experiments. The predicted upper
limit for the lightest CP-even neutral Higgs boson is somewhat larger than in
the MSSM, and can be tested in the upcoming Large Hadron Collider.


title: Splitting the split supersymmetry

abstract:
  In split supersymmetry, the supersymmetric scalar particles are all very
heavy, at least at the order of 10^9 GeV, but the gauginos, Higgsinos, and one
of the neutral Higgs bosons remain below a TeV. Here we further split the split
supersymmetry by taking the Higgsino mass parameter \mu to be very large. In
this case, the \mu problem is avoided and we keep the wino as a dark matter
candidate. A crude gauge coupling unification is still preserved. Dark matter
signals and collider phenomenology are discussed in this \mu-split SUSY
scenario. The most interesting dark matter signal is the annihilation into
monochromatic photons. In colliders, chargino-pair and the associated
chargino-neutralino production cross sections have a certain ratio due to gauge
couplings, and the chargino has long decays.


title:
Charge Radii of the Proton and Valence Quarks in the Quasipotential
  Model

abstract:
  The mean square radius of the proton charge distribution was studied in the
framework of the relativistic quasipotential quark model in assumption of the
SU(6)-symmetry. It was shown that the proton charge radius is represented as
function f(m/\gamma)/M^2 for point quarks (m is a quark mass, \gamma is the
scale of the coupling energy, M is the nucleon mass, f is undimentional
function, which does not depended on M). It was shown, that in the ultra
relativistic region the mean square radius of the bound system can have
negative value. To describe simultaneously nucleon magnetic moments and proton
radius in the oscillator model it is need to suppose that quark has the
negative mean square radius <r^2_{1q}> = -1.875/m^2.


title: Width of Theta - pentaquarks in relativistic quark model

abstract:
  The relativistic generalization of Faddeev-Yakubovsky approach is constructed
in the form of the dispersion relations. The five-quark amplitudes for the
low-lying pentaquarks contain u,d,s-quarks. The poles of these amplitudes
determine the masses and widths of Theta-pentaquarks.


title: Relativistic Harmonic Oscillator

abstract:
  We study the semirelativistic Hamiltonian operator composed of the
relativistic kinetic energy and a static harmonic-oscillator potential in three
spatial dimensions and construct, for bound states with vanishing orbital
angular momentum, its eigenfunctions in compact form, i. e., as power series,
with expansion coefficients determined by an explicitly given recurrence
relation. The corresponding eigenvalues are fixed by the requirement of
normalizability of the solutions.


title: $B^0 \to \phi\phi$ Decay in Perturbative QCD Approach

abstract:
  The rare decay $B^0 \to \phi\phi$ can occur only via penguin annihilation
topology in the standard model. We calculate this channel in the perturbative
QCD approach. The predicted branching ratio is very small at ($10^{-8}$). We
also give the polarization fractions, which shows that the transverse
polarization contribution is comparable to the longitudinal one, due to a big
transverse contribution from factorizable diagrams.
  The small branching ratio in SM, makes it sensitive to any new physics
contributions.


title: Energy Flow Observables

abstract:
  A few comments are made on the role of nonperturbative and perturbative power
corrections. This is followed by a description of energy flow observables and
correlations that may provide a flexible approach to rapidity distributions in
hadronic scattering.


title: Chaos in the Color Glass Condensate

abstract:
  The number of gluons in the hadron wave function is discrete, and their
formation in the chain of small $x$ evolution occurs over discrete rapidity
intervals of $\Delta y \simeq 1/\as$. We therefore consider the evolution as a
discrete quantum process. We show that the discrete version of the mean-field
Kovchegov evolution equation gives rise to strong fluctuations in the
scattering amplitude, not present in the continuous equation. We find that if
the linear evolution is as fast as predicted by the perturbative BFKL dynamics,
the scattering amplitude at high energies exhibits a chaotic behavior. As a
consequence, the properties of diffraction at high energies become universal.


title: Running Neutrino Mass Parameters in See-Saw Scenarios

abstract:
  We systematically analyze quantum corrections in see-saw scenarios, including
effects from above the see-saw scales. We derive approximate renormalization
group equations for neutrino masses, lepton mixings and CP phases, yielding an
analytic understanding and a simple estimate of the size of the effects. Even
for hierarchical masses, they often exceed the precision of future experiments.
Furthermore, we provide a software package allowing for a convenient numerical
renormalization group analysis, with heavy singlets being integrated out
successively at their mass thresholds. We also discuss applications to model
building and related topics.


title: The thermal operator representation for Matsubara sums

abstract:
  We prove in full generality the thermal operator representation for Matsubara
sums in a relativistic field theory of scalar and fermionic particles. It
states that the full result of performing the Matsubara sum associated to any
given Feynman graph, in the imaginary-time formalism of finite-temperature
field theory, can be directly obtained from its corresponding zero-temperature
energy integral, by means of a simple linear operator, which is independent of
the external Euclidean energies and whose form depends solely on the topology
of the graph.


title:
Analytic continuation of the Mellin moments of deep inelastic structure
  functions

abstract:
  We derive the analytic continuation of the Mellin moments of deep inelastic
structure functions at the next-to-next-to-leading order accuracy.


title:
Threshold Effects on Quasi-degenerate Neutrinos with High-scale Mixing
  Unification

abstract:
  We consider threshold effects on neutrino masses and mixings in a recently
proposed model for understanding large solar and atmospheric mixing angles
using radiative magnification for the case of quasi-degenerate neutrinos. We
show that the magnitude of the threshold effects is sufficient to bring
concordance between the predictions of this model and latest data from ${\rm
KamLAND}$ and ${\rm SNO}$ on observations of neutrino oscillations.


title:
Collective excitations in a superfluid of color-flavor locked quark
  matter

abstract:
  We investigate collective excitations coupled with baryon density in a system
of massless three-flavor quarks in the collisionless regime. By using the
Nambu-Jona-Lasinio (NJL) model in the mean-field approximation, we derive the
spectra both for the normal and color-flavor locked (CFL) superfluid phases at
zero temperature. In the normal phase, we obtain zero sound as a low-lying
collective mode in the particle-hole (vector) channel. In the CFL phase, when
the excitation energy, $\omega$, is smaller than the threshold given by twice
the pairing gap $\Delta$ ($\omega<2\Delta$), a phonon corresponding to
fluctuations in the U(1) phase of $\Delta$ appears as a sharp peak in the
particle-particle ($H$) channel. We reproduce the property known from low
energy effective theories that this mode propagates at a velocity of
$v_H=1/\sqrt{3}$ in the low momentum regime; the decay constant $f_H$ in the
NJL model is identical with the QCD result in the mean-field approximation. We
also find that as the momentum of the phonon increases, the excitation energy
goes up and asymptotically approaches $\omega=2\Delta$. Above the threshold for
pair excitations ($\omega>2\Delta$), zero sound manifests itself in the vector
channel. By locating the zero sound pole of the vector propagator in the
complex energy plane we investigate the attenuation and energy dispersion
relation of zero sound. In the long wavelength limit, the phonon mode has its
spectral weight in the $H$ channel alone, while the spectral function vanishes
in the vector channel. We finally extend our study to the case of nonzero
temperature.


title: Improvement of the hot QCD pressure by the minimal sensitivity criterion

abstract:
  The principles of minimal sensitivity (PMS) criterion is applied to the
perturbative free energy density, or pressure, of hot QCD, which include the
$\sim g_s^6 \ln g_s$ and part of the $\sim g_s^6$ terms. Applications are made
separately to the short- and long-distance parts of the pressure. Comparison
with the lattice results, at low temperatures, shows that the resultant ``
optimal'' approximants are substantially improved when compared to the
$\bar{MS}$ results. In particular, for the realistic case of three quark
flavors, the `` optimal'' approximants are comparable with the lattice results.


title: Magnetic moment of the pentaquark $\Theta^+(1540)$ with QCD sum rules

abstract:
  In this article, we study the magnetic moment of the pentaquark state $
\Theta^+(1540)$ with the QCD sum rules approach in the external electromagnetic
field. The numerical results indicate the magnetic moment of the pentaquark
state $ \Theta^+(1540)$ is about $\mu_{\Theta^+}=(0.24\pm0.02)\mu_N$.


title:
Next-to-leading order QCD predictions for pair production of neutral
  Higgs bosons at the CERN Large Hadron Collider

abstract:
  We present the calculations of the complete NLO inclusive total cross
sections for pair production of neutral Higgs bosons through $b\bar b$
annihilation in the minimal supersymmetric standard model at the CERN Large
Hadron Collider. In our calculations, we used both the DREG scheme and the DRED
scheme and found that the NLO total cross sections in the above two schemes are
the same. Our results show that the $b\bar b$-annihilation contributions can
exceed ones of $gg$ fusion and $q\bar q$ annihilation for $h^0H^0$, $A^0h^0$
and $A^0H^0$ productions when $\tan\beta$ is large. In the case of $\mu>0$, the
NLO corrections enhance the LO total cross sections significantly, which can
reach a few tens percent, while for $\mu<0$, the corrections are relatively
small, and are negative in most parameter space. Moreover, the NLO QCD
corrections can reduce the dependence of the total cross sections on the
renormalization/factorization scale, especially for $\mu<0$. We also use the
CTEQ6.1 PDF sets to estimate the uncertainty of LO and NLO total cross
sections, and find that the uncertainty arising from the choice of PDFs
increases with the increasing $m_{A^0}$.


title: TeV String Theories, Mini Black Holes and Trans-GZK Cosmic Rays

abstract:
  We review the proposal that trans-GZK cosmic ray interactions are caused by
neutrino primaries. The primaries cause excitations of strings and give rise to
extensive air showers (EAS) resembling EAS induced by nuclei. We also show that
in ``low scale'' string models (of characteristic energy about 70TeV) the
excited string and the mini black hole pictures are equivalent.


title: The Mysteries of the Highest Energy Cosmic Rays

abstract:
  We give a summary of the theoretical attempts to make sense of the
observational data concerning the highest energy cosmic rays, (E > 3x10^{19}
eV).


title:
Time-reversal odd distribution functions in chiral models with vector
  mesons

abstract:
  The so-called time-reversal odd distribution functions are known to be
non-vanishing in QCD due to the presence of the link operator in the definition
of these quantities. I show that T-odd distributions can be non-vanishing also
in chiral models, if vector mesons are introduced as dynamical gauge bosons of
a hidden local symmetry. Moreover, since the flavor dependence of these
distributions is different in chiral models respect to non chiral ones, the
phenomenological analysis of experimental data will be able to distinguish
between these two classes of models.


title: CNGS neutrino beam systematics for $\theta_{13}$

abstract:
  Energy spectra, intensity and composition of the CERN to Gran Sasso CNGS
neutrino beam for nu_mu-->nu_tau and nu_mu-->nu_e oscillation searches are
presented. The associated beam systematics, which is the major ingredient for
the nu_mu-->nu_e search sensitivity, are obtained from the study of the
previous CERN WANF.


title:
Shear viscosity of hot QCD from transport theory and thermal field
  theory in real time formalism

abstract:
  We study shear viscosity in weakly coupled hot pure gauge field QCD theory
basing on transport theory and the Kubo formula using the closed time path
formalism (CTP) of real time finite temperature field theory. We show that the
viscosity can be obtained as the integral of a retarded three-point function.
Non-perturbative corrections to the bare one loop result can be obtained by
solving a Schwinger-Dyson type integral equation for this vertex. This integral
equation represents the resummation of an infinite series of ladder diagrams
which all contribute to the leading-log order result. We show that this
integral equation has exactly the same form as the linearized Boltzmann
equation and explain the reason behind this formal equality.


title: Flavor-number dependence of QCD vacuum tensor susceptibilities

abstract:
  The values of quark condensate and tensor susceptibility of QCD vacuum are
calculated with different number of flavors. It is shown that, the values of
tensor susceptibility are obviously dependent on the flavor numbers while the
flavor-number dependence of quark condensate is undetermined.


title:
Phenomenological Issues in Supersymmetry with Non-holomorphic Soft
  Breaking

abstract:
  We present a through discussion of motivations for and phenomenological
issues in supersymmetric models with minimal matter content and non-holomorphic
soft-breaking terms. Using the unification of the gauge couplings and assuming
SUSY is broken with non-standard soft terms, we provide semi-analytic solutions
of the RGEs for low and high choices of tan\beta which can be used to study the
phenomenology in detail. We also present a generic form of RGIs in mSUGRA
framework which can be used to derive new relations in addition to those
existing in the literature. Our results are mostly presented with respect to
the conventional minimal supersymmetric model for ease of comparison.


title: Signatures of Axinos and Gravitinos at Colliders

abstract:
  The axino and the gravitino are well-motivated candidates for the lightest
supersymmetric particle (LSP) and also for cold dark matter in the Universe.
Assuming that a charged slepton is the next-to-lightest supersymmetric particle
(NLSP), we show how the NLSP decays can be used to probe the axino LSP scenario
in hadronic axion models as well as the gravitino LSP scenario at the Large
Hadron Collider and the International Linear Collider. We show how one can
identify experimentally the scenario realized in nature. In the case of the
axino LSP, the NLSP decays will allow one to estimate the value of the axino
mass and the Peccei-Quinn scale.


title: A review of the hard pomeron in soft diffraction

abstract:
  We review the evidence for the presence of a hard singularity in soft forward
amplitudes, and give an estimate of its trajectory and couplings.


title:
Third-order Coulomb corrections to the S-wave Green function, energy
  levels and wave functions at the origin

abstract:
  We obtain analytic expressions for the third-order corrections due to the
strong interaction Coulomb potential to the S-wave Green function, energy
levels and wave functions at the origin for arbitrary principal quantum number
n. Together with the known non-Coulomb correction this results in the complete
spectrum of S-states up to order alpha_s^5. The numerical impact of these
corrections on the Upsilon spectrum and the top quark pair production cross
section near threshold is estimated.


title:
Combination of Heavy Quark with Partons from Quark-Gluon Matter: a
  Scaling Probe

abstract:
  In relativistic heavy ion collisions, the cross section of heavy hadron
production via the combination of a heavy quark with a light one from the
quark-gluon matter can be factorized. It is the convolution of twist-4
combination matrix elements, the parameters corresponding to the parton
distributions of the quark-gluon matter, as well as the hard partonic cross
section of heavy quark production calculable in PQCD. These parton
distributions and combination matrix elements are functions of a scaling
variable which is the momentum fraction of the heavy quark w.r.t. the heavy
hadron. In the same factorization framework, the combination matrix elements
appear in other `simpler' processes and can be extracted. Taking them as
inputs, comparing with data from RHIC and (future) LHC, we can get the parton
distributions of the quark-gluon matter just as the similar way we get those of
nucleon, pion, or photon, etc..


title: Quark-Gluon Antenna Functions from Neutralino Decay

abstract:
  The computation of exclusive QCD jet observables at higher orders requires a
method for the subtraction of infrared singular configurations arising from
multiple radiation of real partons. One commonly used method at next-to-leading
order (NLO) is based on the antenna factorization of colour-ordered matrix
elements, and uses antenna functions to subtract the real radiation
singularities. Up to now, NLO antenna functions could be derived in a
systematic manner only for hard quark-antiquark pairs, while the gluon-gluon
and quark-gluon antenna functions were constructed from their limiting
behaviour. In this paper, we show that antenna functions for hard quark-gluon
pairs can be systematically derived from an effective Lagrangian describing
heavy neutralino decay. The infrared structure of the colour-ordered neutralino
decay matrix elements at NLO and NNLO is shown to agree with the structure
observed for parton radiation off a quark-gluon antenna.


title: Charm quenching in heavy-ion collisions at the LHC

abstract:
  D-meson suppression in Pb-Pb collisions at the LHC due to charm quark
in-medium energy loss is estimated within a model that describes the available
quenching measurements at RHIC. The result is compared to that previously
published by the author. The expected sensitivity of the ALICE experiment for
studying charm energy loss via fully-reconstructed D^0-meson decays is also
presented.


title: Charm and beauty of the Large Hadron Collider

abstract:
  With the acceleration of lead nuclei in the LHC, heavy-ion physics will enter
a new energy domain. One of the main novelties introduced by the 30-fold
energy-jump from RHIC to the LHC is the abundant heavy-quark production. After
discussing a few examples of physics issues that can be addressed using heavy
quarks, we present a selection of results on the expected experimental
capability of ALICE, the dedicated heavy-ion experiment at the LHC, in the
open-heavy-flavour sector.


title: Implications of Dynamical Generation of Standard-Model Fermion Masses

abstract:
  We point out that if quark and lepton masses arise dynamically, then in a
wide class of theories the corresponding running masses $m_{f_j}(p)$ exhibit
the power-law decay $m_{f_j}(p) \propto \Lambda_j^2/p^2$ for Euclidean momenta
$p >> \Lambda_j$, where $f_j$ is a fermion of generation $j$, and $\Lambda_j$
is the maximal scale relevant for the origin of $m_{f_j}$. We estimate
resultant changes in precision electroweak quantities and compare with current
data. It is found that this data allows the presence of such corrections. We
also note that this power-law decay renders primitively divergent fermion mass
corrections finite.


title: Sterile neutrinos in neutrinoless double beta decay

abstract:
  We study possible contribution of the Majorana neutrino mass eigenstate
$\nu_h$ dominated by a sterile neutrino component to neutrinoless double beta
($0\nu\beta\beta$) decay. From the current experimental lower bound on the
$0\nu\beta\beta$-decay half-life of $^{76}$Ge we derive stringent constraints
on the $\nu_h-\nu_e$ mixing in a wide region of the values of $\nu_h$ mass. We
discuss cosmological and astrophysical status of $\nu_h$ in this mass region.


title: Update on the Direct Detection of Supersymmetric Dark Matter

abstract:
  We compare updated predictions for the elastic scattering of supersymmetric
neutralino dark matter with the improved experimental upper limit recently
published by CDMS II. We take into account the possibility that the \pi-nucleon
\Sigma term may be somewhat larger than was previously considered plausible, as
may be supported by the masses of exotic baryons reported recently. We also
incorporate the new central value of m_t, which affects indirectly constraints
on the supersymmetric parameter space, for example via calculations of the
relic density. Even if a large value of \Sigma is assumed, the CDMS II data
currently exclude only small parts of the parameter space in the constrained
MSSM (CMSSM) with universal soft supersymmetry-breaking Higgs, squark and
slepton masses. None of the previously-proposed CMSSM benchmark scenarios is
excluded for any value of \Sigma, and the CDMS II data do not impinge on the
domains of the CMSSM parameter space favoured at the 90 % confidence level in a
recent likelihood analysis. However, some models with non-universal Higgs,
squark and slepton masses and neutralino masses \lappeq 700 GeV are excluded by
the CDMS II data.


title: Higgs Physics: from LEP to a Future Linear Collider

abstract:
  New preliminary combined results from the LEP experiments on searches for the
Higgs boson beyond the Standard Model are presented. The new determination of
the top quark mass at the Tevatron in 2004 influences the interpretations of
the LEP results in both, the Standard Model, and the Minimal Supersymmetric
extension of the Standard Model. Higgs boson physics will also be a major
research area at the future Linear Collider. A review including new preliminary
results on the potential for precision measurements is given.


title: Phase Transition in Asymmetrical Superfluids I: Equal Fermi Surfaces

abstract:
  In this paper, we study phase transitions in asymmetrical fermion
superfluids. In this scenario, the candidates to form pair are particles with
mismatched masses and chemical potentials. We derive an expression for the
critical temperature in terms of the gap and masses (or chemical potentials)
when the constraint of equal Fermi surfaces $m_a\mu_a = m_b\mu_b$ is imposed.


title:
Note on the Slope Parameter of the Baryonic \Lambda_b to \Lambda_c
  Isgur-Wise Function

abstract:
  Using the framework of the Heavy Quark Effective Theory we have re-analyzed
the Isgur-Wise function describing semileptonic \Lambda_b to \Lambda_c decays
in the QCD sum rule approach. The slope parameter of the Isgur-Wise function is
found to be \rho^2 = 1.35 \pm 0.12, which is consistent with an experimental
measurement and a lattice calculation. To O(1/m_b,1/m_c) of the heavy quark
expansion the integrated \Lambda_b decay width is used to extract the CKM
matrix element V_{cb} for which we obtain a value of |V_{cb}| = 0.041 \pm 0.004
in excellent agreement with the value of |V_{cb}| determined from semileptonic
B to D^* decays.


title:
Physics Beyond the Standard Model: Exotic Leptons and Black Holes at
  Future Colliders

abstract:
  The Standard Model of particle physics has been remarkably successful in
describing present experimental results. However, it is assumed to be only a
low-energy effective theory which will break down at higher energy scales,
theoretically motivated to be around 1 TeV. There are a variety of proposed
models of new physics beyond the Standard Model, most notably supersymmetric
and extra dimension models. New charged and neutral heavy leptons are a feature
of a number of theories of new physics, including the `intermediate scale'
class of supersymmetric models. Using a time-of-flight technique to detect the
charged leptons at the Large Hadron Collider, the discovery range (in the
particular scenario studied in the first part of this thesis) is found to
extend up to masses of 950 GeV. Extra dimension models, particularly those with
large extra dimensions, allow the possible experimental production of black
holes. The remainder of the thesis describes some theoretical results and
computational tools necessary to model the production and decay of these
miniature black holes at future particle colliders. The grey-body factors which
describe the Hawking radiation emitted by higher-dimensional black holes are
calculated numerically for the first time and then incorporated in a Monte
Carlo black hole event generator; this can be used to model black hole
production and decay at next-generation colliders. It is hoped that this
generator will allow more detailed examination of black hole signatures and
help to devise a method for extracting the number of extra dimensions present
in nature.


title: Induced top Yukawa coupling and suppressed Higgs mass parameters

abstract:
  In the scenarios with heavy top squarks, mass parameters of the Higgs field
must be fine-tuned due to a large logarithmic correction to the soft scalar
mass. We consider a new possibility that the top Yukawa coupling is small above
TeV scale. The large top mass is induced from strong Yukawa interaction of the
Higgs with another gauge sector, in which supersymmetry breaking parameters are
given to be small. Then it is found that the logarithmic correction to the
Higgs soft scalar mass is suppressed in spite of the strong coupling and the
fine-tuning is ameliorated. We propose an explicit model coupled to a
superconformal gauge theory which realizes the above situation.


title: Nucleon electromagnetic structure: past, present, and future

abstract:
  We present the experimental status of electromagnetic hadron form factors.
New and surprising results, based on polarization measurements, have been
recently obtained for the electric proton and neutron form factors. In
particular, the electric and magnetic distributions inside the proton appear
not to be the same, in disagreement with results extracted from the unpolarized
cross section, using the Rosenbluth separation. The new findings have given
rise to a large number of papers and different speculations, as they question
directly the models of nucleon structure and the reaction mechanism itself
(based on $1\gamma$-exchange), with a possible revision of the calculation of
radiative corrections, two-photon contribution etc. New data in time-like
region are also available, through annihilation reactions. A large interest in
this field arises, due also to the possibility of new measurements in polarized
electron nucleon elastic scattering at JLab, and also in the time-like region,
at Frascati and at the future FAIR international facility.


title: Effective Field Theories in Nuclear Particle and Atomic Physics

abstract:
  These are the proceedings of the workshop on ``Effective Field Theories in
Nuclear, Particle and Atomic Physics'' held at the Physikzentrum Bad Honnef of
the Deutsche Physikalische Gesellschaft, Bad Honnef, Germany from December 13
to 17, 2005. The workshop concentrated on Effective Field Theory in many
contexts. A first part was concerned with Chiral Perturbation Theory in its
various settings and explored strongly its use in relation with lattice QCD.
The second part consisted of progress in effective field theories in systems
with one, two or more nucleons as well as atomic physics. Included are a short
contribution per talk.


title: Search for new heavy resonances at the LHC

abstract:
  In this article we carry out an analysis of LHC potential to search for new
dimuon resonance states from extended gauge models and the Randall-Sundrum
scenario of TeV-scale gravity.


title: The Standard Model of Electroweak Interactions

abstract:
  Gauge invariance is a powerful tool to determine the dynamics of the
electroweak and strong forces. The particle content, structure and symmetries
of the Standard Model Lagrangian are discussed. Special emphasis is given to
the many phenomenological tests which have established this theoretical
framework as the Standard Theory of electroweak interactions.


title: Vector Goldstone Boson and Lorentz Invariance

abstract:
  Spontanous symmetry breaking usually gives spin 0 Goldstone bosons for the
case of internal symmetries and spin 1/2 fermions for the supersymmetry. The
spontaneous breaking of higher dimensional Lorentz symmetry can give vector
Goldstone boson in 4-dimension.


title: Concluding Remarks/Summary

abstract:
  These remarks summarize some of the discussion at the NOW 2004; in addition
some topics not touched on at the meeting are reviewed briefly.


title:
The two-photon exchange contribution to elastic electron-nucleon
  scattering at large momentum transfer

abstract:
  We estimate the two-photon exchange contribution to elastic electron-proton
scattering at large momentum transfer by using a quark-parton representation of
virtual Compton scattering. We thus can relate the two-photon exchange
amplitude to the generalized parton distributions which also enter in other
wide angle scattering processes. We find that the interference of one- and
two-photon exchange contribution is able to substantially resolve the
difference between electric form factor measurements from Rosenbluth and
polarization transfer experiments. Two-photon exchange has additional
consequences which could be experimentally observed, including nonzero
polarization effects and a positron-proton/electron-proton scattering
asymmetry. The predicted Rosenbluth plot is no longer precisely linear; it
acquires a measurable curvature, particularly at large laboratory angle.


title:
Constraining msugra parameters with mu->e gamma and mu-e conversion in
  nuclei

abstract:
  We show that, in the MSSM with msugra boundary conditions and seesaw induced
neutrino masses, the values of BR(mu->e gamma) and the mu-e conversion rate in
a nucleus determine the sign of mu and constrain tan beta in a model
independent way.


title:
Running Neutrino Masses, Leptonic Mixing Angles and CP-Violating Phases:
  From $M_{\rm Z}$ to $\Lambda_{\rm GUT}$

abstract:
  We derive renormalization group equations for neutrino masses, leptonic
mixing angles and CP-violating phases running at energies above the seesaw
threshold, both in the Standard Model and in the Minimal Supersymmetric
Standard Model extended with three right-handed neutrinos. With these
equations, we carry out a systematic study of the radiative correction that may
arise to neutrino parameters, via their renormalization group evolution from
the electroweak scale ($M_{\rm Z}$) to the scale of Grand Unified theories
($\Lambda_{\rm GUT}$). We study in detail three typically interesting neutrino
mass patterns: normal hierarchy, near degeneracy and inverted hierarchy.
Magnitudes of possible corrections in each case are carefully investigated. We
also emphasize the significance of CP-violating phases in controlling the
evolution behavior of all neutrino parameters.


title: Dyson-Schwinger equation in the global color symmetry model

abstract:
  This paper has been withdrawn by the author due to the unsure solutions to
the Dyson-Schwinger equation.


title:
The generalized parton distributions of the nucleon in the NJL model
  based on the Faddeev approach

abstract:
  We study the generalized parton distributions, including the helicity-flip
ones, using Nambu-Jona-Lasinio model based on a relativistic Faddeev approach
with `static approximation'. Sum rules relating the generalized parton
distributions to nucleon electromagnetic form factors are satisfied. Moreover,
quark-antiquark contributions in the region $-\xi<x<\xi$ are non-vanishing. Our
results are qualitatively similar to those calculated with Radyushkin's double
distribution ansatz using forward parton distribution functions calculated in
the NJL model as inputs.


title:
Nonuniversality Aspects of Nonlinear k_\perp-factorization for Hard
  Dijets

abstract:
  The origin of the breaking of conventional linear k_\perp-factorization for
hard processes in a nuclear environment is by now well established. The
realization of the nonlinear nuclear k_\perp-factorization which emerges
instead was found to change from one jet observable to another. Here we
demonstrate how the pattern of nonlinear k_\perp-factorization, and especially
the role of diffractive interactions, in the production of dijets off nuclei
depends on the color properties of the underlying pQCD subprocess.


title: Progress in bottom-quark fragmentation

abstract:
  I review recent progress on bottom-quark fragmentation in e+e- annihilation,
top-quark decay and H -> b bbar processes. I discuss the implementation of
collinear and soft resummation, and the inclusion of non-perturbative
information taken from LEP and SLD data.


title: Traveling waves and geometric scaling at non-zero momentum transfer

abstract:
  We extend the search for traveling-wave asymptotic solutions of the
non-linear Balitsky-Kovchegov (BK) saturation equation to non-forward
dipole-target amplitudes. Making use of conformal invariant properties of the
Balitsky-Fadin-Kuraev-Lipatov (BFKL) kernel, we exhibit traveling-wave
solutions in momentum space in the region where the momentum transfer q is
smaller than the characteristic scale Q of the projectile. We prove geometric
scaling in the variable Q/(q Omega_s(Y)) where Omega_s(Y) has the same energy
dependence as in the forward analysis.


title: The pentaquark $\Theta^+(1540)$ in the string model

abstract:
  We consider the $\Theta^+(1540)$ pentaquark in the string model that
correctly reproduces the linear Regge trajectories for the case of orbital
excitations of light $q\bar q$ mesons and $qqq$ baryons. Assuming (and arguing
in favour of) the diquark-antiquark-diquark ($[ud]\bar s [ud]$) clustering of
this orbitally excited object we found its mass about $290 \rm {MeV}$ above the
experimental value $1540 \rm {MeV}$. In the model considered this discrepancy
could be attributed to the change of the constituent mass of $\bar s$ antiquark
as compared to that of $s$ quark localized at the string end.


title: A Predictive Seesaw Scenario for EDMs

abstract:
  The generation of electric dipole moments (EDMs) is addressed in the
supersymmetric seesaw scenario realized through the exchange of SU(2)_W triplet
states. In particular, we show that the triplet soft-breaking bilinear term can
induce finite contributions to lepton and quark EDMs. Moreover, the peculiar
flavour structure of the model allows us to predict the EDM ratios d_e/d_mu and
d_mu/d_tau only in terms of the neutrino parameters.


title:
Light quark mass ratio from Dalitz plot of $\eta \to \pi^+\pi^-\pi^0$
  decay

abstract:
  High statistics Dalitz-plot distribution of $\eta \to \pi^+\pi^-\pi^0$ decay
obtained recently by KLOE collaboration \cite{kloe} is fitted to the results of
corresponding theoretical calculations in Chiral Perturbation Theory (ChPT)
with unitarity corrections taken into account. The quark mass ratio $Q =
\sqrt{(m^2_s - (m_d + m_u)^2/4)/(m^2_d - m^2_u)} $ can be otained from this
analysis. We get $Q= 22.8\pm 0.4$ which differs from the value $Q_{DT} = 24.2$
that follows from Dashen's theorem and agrees with recently calculated
electromagnetic kaon mass difference.


title: Triplicity of Quarks and Leptons

abstract:
  Quarks come in three colors and have electric charges in multiples of
one-third. There are also three families of quarks and leptons. Whereas the
first two properties can be understood in terms of unification symmetries such
as SU(5), SO(10), or E_6, why there should only be three families remains a
mystery. I propose how all three properties involving the number three are
connected in a fivefold application of the gauge symmetry SU(3).


title:
Constraining New Forces in the Casimir Regime Using the Isoelectronic
  Technique

abstract:
  We report the first isoelectronic differential force measurements between a
Au-coated probe and two Au-coated films, made out of Au and Ge. These
measurements, performed at submicron separations using soft
microelectromechanical torsional oscillators, eliminate the need for a detailed
understanding of the probe-film Casimir interaction. The observed differential
signal is directly converted into limits on the parameters $\alpha$ and
$\lambda$ which characterize Yukawa-like deviations from Newtonian gravity. We
find $\alpha \lsim 10^{12}$ for $\lambda \sim 200$ nm, an improvement of $\sim$
10 over previous limits.


title: Leptogenesis, $\mu-\tau$ Symmetry and $\theta_{13}$

abstract:
  We show that in theories where neutrino masses arise from type I seesaw
formula with three right handed neutrinos and where large atmospheric mixing
angle owes its origin to an approximate leptonic $\mu-\tau$ interchange
symmetry, the primordial lepton asymmetry of the Universe, $\epsilon_l$ can be
expressed in a simple form in terms of low energy neutrino oscillation
parameters as $\epsilon_l = (a \Delta m^2_\odot+ b \Delta m^2_A
\theta^2_{13})$, where $a$ and $b$ are parameters characterizing high scale
physics and are each of order $\leq 10^{-2} $ eV$^{-2}$. We also find that for
the case of two right handed neutrinos, $\epsilon_l \propto \theta^2_{13}$ as a
result of which, the observed value of baryon to photon ratio implies a lower
limit on $\theta_{13}$. For specific choices of the CP phase $\delta$ we find
$\theta_{13}$ is predicted to be between $0.10-0.15$.


title: Vector meson photoproduction studied in its radiative decay channel

abstract:
  We provide an analysis of vector meson photoproduction in the channel of the
vector meson decaying into a pseudoscalar meson plus a photon, i.e. $V\to
P\gamma$. It is shown that non-trivial kinematic correlations arise from the
measurement of the $P\gamma$ angular distributions in the overall c.m. system
in comparison with those in the vector-meson-rest frame. In terms of the vector
meson density matrix elements, the implication of such kinematic correlations
in the measurement of polarization observables is discussed. For the $\omega$
meson production, due to its relatively large branching ratios for
$\omega\to\pi^0\gamma$, additional events from this channel may enrich the
information about the reaction mechanism and improve the statistics of the
recent measurement of polarized beam asymmetries by the GRAAL Collaboration.
For $\phi\to \eta\gamma$, $\rho\to \pi\gamma$, and $K^*\to K\gamma$, we expect
that additional information about the spin structure of the vector meson
production vertex can be derived.


title: The many body problem in relativistic quantum mechanics

abstract:
  We discusse a relativistic Hamiltonian for an n-body problem in which all the
masses are equal and all spins take value 1/2. In the frame of reference in
which the total momentum $\v{P}=0$, the Foldy-Wouthuysen transformation is
applies and the positive energy part of the Hamiltonian is separated. The
Hamiltonian with unharmonic oscillator potential is applied to describe mass
differences for charmonium and bottonium states.


title:
Kaluza-Klein masses of bulk fields with general boundary conditions in
  AdS$_5$

abstract:
  Recently bulk Randall-Sundrum theories with the gauge group $SU(2)_L \times
SU(2)_R \times U(1)_{B-L}$ have drawn a lot of interest as an alternative to
electroweak symmetry breaking mechanism. These models are in better agreement
with electroweak precision data since custodial isospin symmetry on the IR
brane is protected by the extended bulk gauge symmetry. We comprehensively
study, in the $S^1/\ZZ$ orbifold, the bulk gauge and fermion fields with the
general boundary conditions as well as the bulk and localized mass terms.
Master equations to determine the Kaluza-Klein (KK) mass spectra are derived
without any approximation, which is an important basic step for various
phenomenologies at high energy colliders. The correspondence between orbifold
boundary conditions and localized mass terms is demonstrated not only in the
gauge sector but also in the fermion sector. As the localized mass increases,
the first KK fermion mass is shown to decrease while the first KK gauge boson
mass to increase. The degree of gauge coupling universality violation is
computed to be small in most parameter space, and its correlation with the mass
difference between the top quark and light quark KK mode is also studied.


title:
The generalized parton distribution functions and the nucleon spin sum
  rules in the chiral quark soliton model

abstract:
  The theoretical predictions are given for the forward limit of the
unpolarized spin-flip isovector generalized parton distribution function $(E^u
- E^d)(x, \xi, t)$ within the framework of the chiral quark soliton model, with
full inclusion of the polarization of Dirac sea quarks. We observe that $[(H^u
- H^d) + (E^u - E^d)](x,0,0)$ has a sharp peak around $x=0$, which we interpret
as a signal of the importance of the pionic $q \bar{q}$ excitation with large
spatial extension in the transverse direction. Another interesting indication
given by the predicted distribution in combination with Ji's angular momentum
sum rule is that the $\bar{d}$-quark carries more angular momentum than the
$\bar{u}$-quark in the proton, which may have some relation with the physics of
the violation of the Gottfried sum rule.


title: Probing Universal Extra Dimension at the International Linear Collider

abstract:
  In the context of an universal extra-dimensional scenario, we consider
production of the first Kaluza-Klein electron positron pair in an $e^+e^-$
collider as a case-study for the future International Linear Collider. The
Kaluza-Klein electron decays into a nearly degenerate Kaluza-Klein photon and a
standard electron, the former carrying away missing energy. The Kaluza-Klein
electron and photon states are heavy with their masses around the inverse
radius of compactification, and their splitting is controlled by radiative
corrections originating from bulk and brane-localised interactions. We look for
the signal event $e^+e^- +$ large missing energy for $\sqrt s = 1$ TeV and
observe that with a few hundred fb$^{-1}$ luminosity the signal will be readily
detectable over the standard model background. We comment on how this signal
may be distinguished from similar events from other new physics.


title:
Combining Information from $B \to \pi \pi $ and $B \to \pi \rho, \pi
  \omega $ Decays

abstract:
  We consider the $B \to \pi \pi $ and $B \to \pi \rho, \pi \omega $ decays
alongside each other, taking into account the contributions from all individual
penguin amplitudes generated by the internal $t$, $c$, and $u$ quarks. We argue
that three ratios of penguin amplitudes, each for a different internal quark,
formed by dividing the individual penguin amplitude in $B \to \pi \pi$ by the
corresponding amplitude in $B \to \pi \rho, \pi \omega $, should be equal. We
study the implications of the assumed existence of this connection between
$B\to \pi \pi$ and $B \to \pi \rho, \pi \omega $.
  First, accepting that in the $B \to \pi \pi$ decays the ratio $C/T$ of the
colour-suppressed factorization amplitude $C$ to the tree factorization
amplitude $T$ is negligible, we determine the ratio of individual penguin
amplitudes. Then, from the $B \to \pi \rho, \pi \omega$ data, we extract the
effective (i.e. possibly containing some penguin terms) tree and the effective
colour-suppressed amplitudes relevant for these processes, and the
corresponding solutions for the factorization amplitudes. Finally, we argue
that the $C/T$ ratio in $B \to \pi \pi $ should be identical to its counterpart
in $B \to \pi \rho, \pi \omega$ (relevant for pion emission from the decaying
$b$ quark). This constraint permits the determination of $C/T$ and of other
amplitude ratios directly from the data. Although the $|C/T|$ ratio extracted
from the available data still carries a substantial error, it is consistent
with the expected value of 0.25 - 0.5.


title: Study the exotic $\Theta^+$ in polarized photoproduction reactions

abstract:
  We present an analysis of a Beam-Target double polarization asymmetry in
$\gamma n\to \Theta^+ K^-$. We show that this quantity can serve as a filter
for the determination of the $\Theta^+$'s spin-parity assignment near
threshold. It is highly selective between $1/2^+$ and $1/2^-$ configurations
due to dynamical reasons.


title:
Determining the CP Violation Angle $\gamma$ in $B_s$ Decays without
  Hadronic Uncertainty

abstract:
  We study the rare decays $B_s^0\to D^\pm \pi^\mp$ and $\bar B_s^0\to D^\mp
\pi^\pm$, which can occur only via annihilation type $W$ exchange diagrams in
the standard model. The time-dependent decay rates of the four channels can
provide four CP parameters, which are experimentally measurable. We show that
the CKM angle $\phi_3=\gamma$ can be determined from these parameters without
any theoretical model dependence. These channels can be measured in future LHCb
experiments to provide a clean way for $\gamma$ measurement.


title:
Pre-critical Phenomena of Two-flavor Color Superconductivity in Heated
  Quark Matter -- diquark-pair fluctuations and non-Fermi liquid behavior --

abstract:
  We investigate the fluctuations of the diquark-pair field and their effects
on observables above the critical temperature $T_c$ in two-flavor color
superconductivity (CSC) at moderate density using a Nambu-Jona-Lasinio-type
effective model of QCD. Because of the strong-coupling nature of the dynamics,
the fluctuations of the pair field develop a collective mode, which has a
prominent strength even well above T_c. We show that the collective mode is
actually the soft mode of CSC. We examine the effects of the pair fluctuations
on the specific heat and the quark spectrum for T above but close to T_c. We
find that the specific heat exhibits singular behavior because of the pair
fluctuations, in accordance with the general theory of second-order phase
transitions. The quarks display a typical non-Fermi liquid behavior, owing to
the coupling with the soft mode, leading to a pseudo-gap in the density of
states of the quarks in the vicinity of the critical point. Some experimental
implications of the precursory phenomena are also discussed.


title: Distinguishing between MSSM and NMSSM by combined LHC and ILC analyses

abstract:
  We show that the interplay between the LHC and the e^+ e^- International
Linear Collider (ILC) with sqrt{s}=500 GeV might be crucial for the
discrimination between the minimal and next-to-minimal supersymmetric standard
model. We present an NMSSM scenario that cannot be distinguished from the MSSM
by cross sections and mass measurements if only the light neutralinos and the
lightest chargino are kinematically accessible, even if one of the neutralinos
has a significant singlino component. Mass predictions for the heavier
neutralinos from the ILC analysis and their observation at the LHC lead to an
identification of the neutralino mixing character and the underlying
supersymmetric model in a combined LHC/ILC analysis. In our numerical example
we include errors in the mass measurements and use standard methods of
supersymmetric parameter determination.


title: QCD evolution of hadron and jet multiplicity moments

abstract:
  We describe recent applications of the MLLA evolution equations to the
calculation of mean multiplicities in quark and gluon jets and the higher
moments of hadron and sub-jet multiplicity distributions in
$e^+e^-$-annihilation as function of c.m.s. energy $Q$ and resolution parameter
$y_{cut}$. The transition from jets to hadrons with increasing jet resolution
is considered.


title:
Study Pure Annihilation Decays $B_s^0(\bar B_s^0)\to D^{\pm}\pi^{\mp}$
  in PQCD Approach

abstract:
  The rare decays $B_s^0\to D^\pm \pi^\mp$ and $\bar B_s^0\to D^\mp \pi^\pm$
can occur only via annihilation type diagrams in the standard model. In this
paper, we calculate branching ratios of these decays in perturbative QCD
approach ignoring soft final state interaction. From our calculation, we find
that their branching ratios are at $\mathcal{O}(10^{-6})$ with large CP
asymmetry, which may be measured in LHC-b experiment in future.


title: The baryon static potential from lattice QCD

abstract:
  Lattice QCD simulations offer the possibility of determining the potential
between three static quarks from first principles. We review the status of such
simulations, and the relative standing of the two theoretical proposals for the
baryonic potential: the Delta law (sum of two-body terms) and the Y law (length
of three flux strings joined together at a junction). We also present new
results on the leading Luscher-like corrections to the asymptotic linear
potential.


title:
Renormalized broken-symmetry Schwinger-Dyson equations and the 2PI-1/N
  expansion for the O(N) model

abstract:
  We derive the renormalized Schwinger-Dyson equations for the one- and
two-point functions in the auxiliary field formulation of $\lambda \phi^4$
field theory to order 1/N in the 2PI-1/N expansion. We show that the
renormalization of the broken-symmetry theory depends only on the counter terms
of the symmetric theory with $\phi = 0$. We find that the 2PI-1/N expansion
violates the Goldstone theorem at order 1/N. In using the O(4) model as a low
energy effective field theory of pions to study the time evolution of
disoriented chiral condensates one has to {\em{explicitly}} break the O(4)
symmetry to give the physical pions a nonzero mass. In this effective theory
the {\em additional} small contribution to the pion mass due to the violation
of the Goldstone theorem in the 2-PI-1/N equations should be numerically
unimportant.


title:
Contrasting Supersymmetry and Universal Extra Dimensions at the CLIC
  Multi-TeV e+e- Collider

abstract:
  Universal extra dimensions and supersymmetry have rather similar experimental
signatures at hadron colliders. The proper interpretation of an LHC discovery
in either case may therefore require further data from a lepton collider. In
this paper we identify methods for discriminating between the two scenarios at
the linear collider. We study the processes of Kaluza-Klein muon pair
production in universal extra dimensions in parallel to smuon pair production
in supersymmetry, accounting for the effects of detector resolution, beam-beam
interactions and accelerator induced backgrounds. We find that the angular
distributions of the final state muons, the energy spectrum of the radiative
return photon and the total cross-section measurement are powerful
discriminators between the two models. Accurate determination of the particle
masses can be obtained both by a study of the momentum spectrum of the final
state leptons and by a scan of the particle pair production thresholds. We also
calculate the production rates of various Kaluza-Klein particles and discuss
the associated signatures.


title: Axial vector tetraquark with S=+2

abstract:
  Possibility of an axial vector isoscalar tetraquark with $ud\bar{s}\bar{s}$
is discussed. If the pentaquark $\Theta^+(1540)$ has the
$(qq)_{\bar{3}}(qq)_{\bar{3}}\bar{q}$ configuration, the isoscalar
$ud\bar{s}\bar{s}$($\vartheta^+$-meson) state with $J^P=1^+$ is expected to
exist in the mass region lower than or close to the mass of $\Theta^+(1540)$.
Within a flux-tube quark model, a possible resonant state of
$ud\bar{s}\bar{s}(J^{P}=1^{+})$ is suggested to appear around 1.4 GeV with the
width ${\cal{O}}(20\sim 50)$ MeV. We propose that the $\vartheta^+$-meson is a
good candidate for the tetraquark search, which would be observed in the
$K^+K^+\pi^-$ decay channel.


title: Can there be neutrino oscillation in Gamma-Ray Bursts fireball ?

abstract:
  The central engine which powers the Gamma-Ray Burst (GRB) fireball, produces
neutrinos in the energy range of about 5-20 MeV. Fractions of these neutrinos
may propagate through the fireball which is far away from the central engine.
We have studied the propagation of these neutrinos through the fireball which
is contaminated by baryons and have shown that, resonant conversion of
neutrinos are possible for the oscillations of nu_e to nu_{mu,tau}, nu_e to
nu_s and anti-nu_(mu,tou) to anti-nu_s if the neutrino mass square difference
and mixing angle are in the atmospheric and/or LSND range. On the other hand it
is probably difficult for neutrinos to have resonant oscillation if the
neutrino parameters are in the solar neutrino range. From the resonance
condition we have estimated the fireball temperature and the baryon load in it.


title:
Startling Equivalences in the Higgs-Goldstone Sector between Radiative
  and Lowest-Order Conventional Electroweak Symmetry Breaking

abstract:
  For the Higgs boson mass of $\sim 220$ GeV expected to arise from radiative
electroweak symmetry breaking, we find the same lowest-order expressions as
would be obtained from conventional electroweak symmetry breaking, given the
same Higgs boson mass, for Higgs-Goldstone sector scattering processes
identified with $W_L^ + W_L^- \to W_L^+ W_L^-$, $W_L^+ W_L^- \to Z_L Z_L$, as
well as for Higgs boson decay widths $H \to W_L^+ W_L^-$, $H \to Z_L Z_L$. The
radiatively broken case, however, leads to an order of magnitude enhancement
over lowest-order conventional symmetry breaking for scattering processes
$W_L^+ W_L^+ \to H H$, $Z_L Z_L \to H H$, as well as a factor of $\sim 30$
enhancement for $H H \to H H$.


title: Non-forward NLO BFKL Kernel

abstract:
  Details of the calculation of the non-forward BFKL kernel at next-to-leading
order (NLO) are offered. Specifically we show the calculation of the two-gluon
production contribution. This contribution was the last missing part of the
kernel. Together with the NLO gluon Regge trajectory, the NLO contribution of
one-gluon production and the contribution of quark-antiquark production which
were found before it defines the kernel completely for any colour state in the
$t$-channel, in particular the Pomeron kernel presented recently.


title: A Comparative Study of Two Models of QGP-Fireball Formation

abstract:
  A Comparative study of the strengths and weakness of the models of fireball
formation namely the statistical model of Ramanathan et.al (Physical Review C
70, 027903, 2004) and the approximation schemes of Kapusta et. al (Physical
Review D 46, 1379, 1992) and its subsequent improved variants is made. The way
to complement the various approximation schemes, in order to enhance their
utility in the phenomenological analysis of QGP data that are expected from
ongoing URHIC experiments, is suggested. The calculations demonstrate a
striking QCD behaviour of the surface tension of the QGP droplet resulting in
its increase with temperature, which is due to the confining nature of QCD
forces at the surface and the interface surface tension varies as the cube of
the transition temperature which is in conformity with the results of Lattice
QCD simulations.


title: Hilltop Inflation

abstract:
  We study `hilltop' inflation, in which inflation takes place near a maximum
of the potential. Viewed as a model of inflation after the observable Universe
leaves the horizon (observable inflation) hilltop inflation is rather generic.
If the potential steepens monotonically, observable hilltop inflation gives a
tiny tensor fraction (r< 0.002). The usual F- and D-term models may easily be
transmuted to hilltop models by Planck-suppressed terms, making them more
natural. The only commonly-considered model of observable inflation which is
definitely not hilltop is tree-level hybrid inflation. Viewed instead as an
initial condition, we explain that hilltop inflation is more generic than seems
to have been previously recognized, adding thereby to the credibility of the
idea that eternal inflation provides the pre-inflationary initial condition.


title: Higher-derivative gravity in brane world models

abstract:
  We investigate brane world models in higher-derivative gravity theories where
the gravitational Lagrangian is an arbitrary function of the Ricci scalar.
Making use of the conformal equivalence of such gravity models and
Einstein-Hilbert gravity with a scalar field, we deduce the main features of
higher-derivative gravity brane worlds. We solve for a gravity model that has
corrections quadratic in the Ricci scalar and show one can evade both
fine-tuning and the need for a bulk cosmological constant. An analysis of
tensor and scalar perturbations shows gravity is localized on the brane and we
recover the Newtonian limit.


title: Pentaquarks, Skyrmions and the Vector Manifestation of Chiral Symmetry

abstract:
  The structure of the pentaquark baryon $\Theta^+$ is discussed in terms of a
$K^+$-skyrmion binding where the skyrmion arises as a soliton in hidden local
symmetry approach to low-energy hadronic physics which may be considered as a
holographic dual to QCD. The "vector manifestation" of chiral symmetry encoded
in the effective theory Wilsonian-matched to QCD is proposed to play an
important role in the binding. Among the options available for understanding
the pentaquark structure is the intriguing possibility that the $\Theta^+$ is a
Feshbach resonance generated by the solitonic matter that drives the
Wess-Zumino term that in the presence of $K^\star$ acts like a magnetic field.


title:
Observability of the Higgs Boson in the Presence of Extra Standard Model
  Families at the Tevatron

abstract:
  The observability of the Higgs boson via the WW^* decay channel at the
Tevatron is discussed taking into account the enhancements due to the possible
existence of the extra standard model (SM) families. It seems that the
existence of new SM families can give the Tevatron experiments (D0 and CDF) the
opportunity to observe the intermediate mass Higgs boson before the LHC


title: Cosmology of Antisymmetric Tensor Field in D-brane Universe

abstract:
  We analyze homogeneous, anisotropic cosmology driven by a self-interacting
``massive'' antisymmetric tensor field $B_{\mu\nu}$ which is present in string
theories with D-branes. Time-dependent magnetic $B$ field existing in the early
universe can lead to the Bianchi type I universe. Evolutions of such a tensor
field are solved exactly or numerically in the universe dominated by vacuum
energy, radiation, and $B$ field itself. The matter-like behavior of the $B$
field (dubbed as ``$B$-matter'') ensures that the anisotropy disappears at late
time and thus becomes unobservable in a reasonable cosmological scenario. Such
a feature should be contrasted to the cosmology of the conventional massless
antisymmetric tensor field.


title: Infrared fixed point of the top Yukawa coupling in split supersymmetry

abstract:
  The severe constraints imposed on the parameter space of the minimal split
supersymmetry model by the infrared fixed point solution of the top Yukawa
coupling $Y_t$ are studied in detail in terms of the value of the top quark
mass measured at the Tevatron together with the lower bound on the lightest
Higgs mass established by LEP. The sensitive dependence of the higgsino mass
parameter $\mu$ and of the gaugino coupling strengths ${\tilde g}_{u,d}$,
${\tilde g}^\prime_{u,d}$ on the value of $Y_t$ in the vicinity of the Landau
pole is a remarkable consequence. A few other interesting features emerge,
though the model is found to be disfavored within the infrared fixed point
scenario because of the need to have several fine tunings at work on account of
the requirement of a low upper bound on $\tan\beta$.


title: Phase dynamics and particle production in preheating

abstract:
  We study a simple model of a massive inflaton field $\phi$ coupled to another
scalar filed $\chi$ with interaction term $g^2\phi^2\chi^2$. We use the theory
developed by Kofman {\em et al.} (Phys. Rev. D {\bf 56} (1997) 3258
[arXiv:hep-ph/9704452])for the first stage of preheating to give a full
description of the dynamics of the $\chi$ field modes, including the behaviour
of the phase, in terms of the iteration of a simple family of circle maps. The
parameters of this family of maps are a function of time when expansion of the
universe is taken into account. With this more detailed description, we obtain
a systematic study of the efficiency of particle production as a function of
the inflaton field and coupling parameters, and we find that for $g \lesssim 3
\times 10^{-4}$ the broad resonance ceases during the first stage of
preheating.


title:
Quark and Lepton Mass Matrix Structures Suggested by the Observed
  Unitary Triangle Shape

abstract:
  Under the hypothesis that the CP violating phase parameter \delta in the CKM
matrix V takes own value so that the radius R(\delta) of the circle
circumscribed about the unitary triangle takes its minimum value, possible
phase conventions of the CKM matrix are investigated. We find that two of the 9
phase conventions can give favorable predictions for the observed shape of the
unitary triangle. One of the successful two suggests phenomenologically
interesting structures of the quark and lepton mass matrices, which lead to
|V_{us}|\simeq \sqrt{m_d/m_s}=0.22, |V_{ub}|\simeq \sqrt{m_u/m_t} =0.0036 and
|V_{cb}|\simeq \sqrt{m_c/2m_t}=0.043 for the CKM matrix V, and to \sin^2
2\theta_{atm}=1, \tan^2 \theta_{solar} \simeq |m_{\nu 1}/m_{\nu 2}|$ and
|U_{13}|\simeq \sqrt{m_e/2 m_\tau} for the lepton mixing matrix U under simple
requirements for the textures.


title: Why does group theory fail to describe charge structure of particles ?

abstract:
  It is pointed out that the group theory cannot describe the charge structure
of particles. Set theory is necessary to describe the charge structure of
particles but the set of charges form group.


title:
Daemons, the "Troitsk anomaly" in tritium beta spectrum, and the KATRIN
  experiment

abstract:
  The "Troitsk anomaly" is a strange bump at the end of the tritium beta
spectrum observed in electron antineutrino mass measurements. It reveals a
half-year variation. The nature of the anomaly can be accounted for by
interaction of negative DArk Electric Matter Objects - daemons detected by us
with the Nb-containing superconducting coils of the gaseous tritium source of
the setup. In crossing the system, the daemons, whose flux varies with a
half-year period, drag away Nb-containing clusters and excite their nuclei and
electronic shells to produce emission of five Auger electron lines within E =
18566-18572 eV. This yields an estimate for the daemon flux ~10-7-10-6 cm-2s-1.
It is shown that in the KATRIN system (KArlsruhe TRItium Neutrino experiment)
presently under construction the ratio of the daemon-stimulated Auger bump
signal to the useful beta-signal should be larger than that in the Troitsk
experiment. The potential of using slightly modified systems at Troitsk and
Karlsruhe to study the daemons is pointed out.


title:
Influence of charming penguins on the extraction of gamma in B->PP
  decays

abstract:
  Charmless B->PP decays are studied using flavor SU(3) symmetry. Amplitude
with charming penguin topology is considered for two cases: with zero and with
arbitrary strong phase. Two sets of data (an older and the most recent one) are
used in the fits, so that the stability of the fits is tested. It is shown that
within the present uncertainties in the data the parameters of the fit may be
significantly modified, especially the gamma angle. The fits indicate the
strong phase of the charming penguin amplitude to be around $\pm 20^{o}$.


title: Radiative Breaking Scenario for the GUT gauge symmetry

abstract:
  The origin of the GUT scale from the top down perspective is explored. The
GUT gauge symmetry is broken by the renormalization group effects, which is an
extension of the radiative electroweak symmetry breaking scenario to the GUT
models. That is, in the same way as the origin of the electroweak scale, the
GUT scale is generated from the Planck scale through the radiative corrections
to the soft SUSY breaking mass parameters. This mechanism is applied to a
perturbative SO(10) GUT model, recently proposed by us. In the SO(10) model,
the relation between the GUT scale and the Planck scale can naturally be
realized by using order one coupling constants.


title: Significant effects of second KK particles on LKP dark matter physics

abstract:
  We point out that Kaluza-Klein (KK) dark matter physics is drastically
affected by second KK particles. In this work various interesting phenomena
caused by the second KK modes are discussed. In particular, we reevaluate the
annihilation cross section and thermal relic density of the KK dark matter
quantitatively in universal extra dimensions, in which all the standard model
particles propagate. In these models, the first KK mode of $B$ boson is a
viable dark matter candidate by virtue of KK-parity. We demonstrate that the KK
dark matter annihilation cross section can be enhanced, compared with the tree
level cross section mediated only by first KK particles. The dark matter mass
consistent with the WMAP observation is increased.


title:
Probing New Physics Via the Transverse Amplitudes of B0-> K*0(-> K- pi+)
  l+l- at Large Recoil

abstract:
  We perform an analysis of the K* polarization states in the exclusive B meson
decay B0->K*0(-> K- pi+)l+ l- (l=e, mu, tau) in the low dilepton mass region,
where the final vector meson has a large energy. Working in the transversity
basis, we study various observables that involve the K* spin amplitudes Aperp,
Apar, A0 by exploiting the heavy-to-light form factor relations in the heavy
quark and large-E_K* limit. We find that at leading order in 1/m_b and alpha_s
the form-factor dependence of the asymmetries that involve transversely
polarized K* completely drops out. At next-to-leading logarithmic order,
including factorizable and non-factorizable corrections, the theoretical errors
for the transverse asymmetries turn out to be small in the standard model (SM).
Integrating over the lower part of the dimuon mass region, and varying the
theoretical input parameters, the SM predicts A_T^(1)=0.9986+/- 0.0002 and
A_T^(2)=-0.043+/- 0.003. In addition, the longitudinal and transverse
polarization fractions are found to be (69+/-3)% and (31+/-3)% respectively, so
that Gamma_L/Gamma_T = 2.23+/-0.31. Beyond the SM, we focus on new physics that
mainly gives sizable contributions to the coefficients C_7^eff' of the
electromagnetic dipole operators. Taking into account experimental data on rare
B decays, we find large effects of new physics in the transverse asymmetries.
Furthermore, we show that a measurement of longitudinal and transverse
polarization fractions will provide complementary information on physics beyond
the SM.


title: Factorization and Non-Factorization of In-Medium Four-Quark Condensates

abstract:
  It is well-established for the vacuum case that in the limit of a large
number of colors N_c the four-quark condensates factorize into products of the
two-quark condensate. It is shown that in the combined large-N_c and
linear-density approximation four-quark condensates do not factorize in a
medium of pions (finite temperature system) but do factorize in a medium of
nucleons (nuclear system).


title: Lorentz and CPT violation: a simple neutrino-oscillation model

abstract:
  We present a three-parameter model for three flavors of massless left-handed
neutrinos with Fermi-point splitting and tri-maximal mixing angles. One of
these parameters is the T-violating phase \delta, for which the experimental
results from K2K and KamLAND appear to favor a nonzero value. Future
experiments, in particular MINOS, will be able to test this simple model.
Possible implications for neutrino factories are briefly discussed.


title:
Complete electroweak O(alpha) corrections to charged-current e+e- -->
  4fermion processes

abstract:
  The complete electroweak O(alpha) corrections are calculated for the
charged-current four-fermion production processes e+e- --> nu_tau tau+ mu-
anti-nu_mu, u anti-d mu- anti-nu_mu, and u anti-d s anti-c. The calculation is
performed using complex gauge-boson masses, supplemented by complex couplings
to restore gauge invariance. The evaluation of the occurring one-loop tensor
integrals, which include 5- and 6-point functions, requires new techniques.
Explicit numerical results are presented for total cross sections in the energy
range from the W-pair-production threshold region up to a scattering energy of
2TeV. A comparison with the predictions based on the "double-pole
approximation" (DPA) provided by the generator RacoonWW reveals corrections
beyond DPA of < 0.5% in the energy range 170-300GeV, in agreement with previous
estimates for the intrinsic DPA uncertainty. The difference to the DPA
increases to 1-2% for sqrt{s} = 1-2TeV. At threshold, where the DPA becomes
unreliable, the full O(alpha) calculation corrects an improved Born
approximation (IBA) by about 1.6%, also consistent with an error estimate of
the IBA.


title: Extremal size fluctuations in QCD dipole cascading

abstract: This paper has been superseded by hep-ph/0510352.


title: Large N_c in Chiral Resonance Lagrangians

abstract:
  In the first part of the talk, I discussed results on the determination of
the ratios of the light quark masses from large N_c chiral perturbation theory,
to be described elsewhere. The following notes contain material from the second
part of the talk, which concerns the implications of large N_c for resonance
dominance estimates of the low energy coupling constants in chiral perturbation
theory.


title:
Implications for New Physics from Fine-Tuning Arguments: II. Little
  Higgs Models

abstract:
  We examine the fine-tuning associated to electroweak breaking in Little Higgs
scenarios and find it to be always substantial and, generically, much higher
than suggested by the rough estimates usually made. This is due to implicit
tunings between parameters that can be overlooked at first glance but show up
in a more systematic analysis. Focusing on four popular and representative
Little Higgs scenarios, we find that the fine-tuning is essentially comparable
to that of the Little Hierarchy problem of the Standard Model (which these
scenarios attempt to solve) and higher than in supersymmetric models. This does
not demonstrate that all Little Higgs models are fine-tuned, but stresses the
need of a careful analysis of this issue in model-building before claiming that
a particular model is not fine-tuned. In this respect we identify the main
sources of potential fine-tuning that should be watched out for, in order to
construct a successful Little Higgs model, which seems to be a non-trivial
goal.


title:
Leptoquark Single and Pair production at LHC with CalcHEP/CompHEP in the
  complete model

abstract:
  We study combined leptoquark (LQ) single and pair production at LHC at the
level of detector simulation. A set of kinematical cuts has been worked out to
maximize significance for combined signal events.
  It was shown that combination of signatures from LQ single and pair
production not only significantly increases the LHC reach, but also allows us
to give the correct signal interpretation. In particular, it was found that the
LHC has potential to discover LQ with a mass up to 1.2 TeV and 1.5 TeV for the
case of scalar and vector LQ, respectively, and LQ single production
contributes 30-50% to the total signal rate for LQ-l-q coupling, taken equal to
the electromagnetic coupling.
  This work is based on implementation of the most general form of scalar and
vector LQ interactions with quarks and gluons into CalcHEP/CompHEP packages.
This implementation, which authors made publicly available, was one the most
important aspects of the study.


title: The interaction of slow J/psi and psi' with nucleons

abstract:
  The interaction of the charmonium resonances J/psi and psi' with nucleons at
low energies is considered using the multipole expansion and low-energy
theorems in QCD. A lower bound is established for the relevant gluonic operator
average over the nucleon. As a result we find the discussed interaction to be
significantly stronger than previously estimated in the literature. In
particular we conclude that the cross section of the J/psi - nucleon elastic
scattering at the threshold is very likely to exceed 17 millibarn and that
existence of bound states of the J/psi in light nuclei is possible. For the
psi' resonance we estimate even larger elastic scattering cross section and
also a very large cross section of the process psi'+N -> psi+N giving rise to
the decay width of tens of MeV for the psi' resonance in heavy nuclei.


title: Multiplicity and Pt Correlations in AA-interactions at High Energies

abstract:
  The theoretical description of the correlations between observables in two
separated rapidity intervals in relativistic nuclear collisions is presented.
It is shown, that the event-by-event pt-pt correlation defined as the
correlation between event mean values of transverse momenta of all particles
emitted in two different rapidity intervals does not decrease to zero with the
increase of the number of strings in contrast with two particle pt-pt
correlation - the correlation between the transverse momenta of single
particles produced in these two rapidity windows.
  In the idealized case with the homogeneous string distribution in the
transverse plane in the framework of the cellular analog of string fusion model
(SFM) the asymptotic of pt-pt correlation coefficient is analytically
calculated and compared with the results of the Monte-Carlo (MC) calculations
fulfilled both in the framework of the original SFM and in the framework of its
cellular analog, which enables to control the MC algorithms.
  In the case with the realistic nucleon distribution density of colliding
nuclei the results of the MC calculations of the pt-pt correlation function for
minimum bias nuclear collisions at SPS, RHIC and LHC energies are presented and
analysed.


title: Nature's Greatest Puzzles

abstract: Opening lecture at the 2004 SLAC Summer Institute.


title: Remarks on High Energy Evolution

abstract:
  We make several remarks on the B-JIMWLK hierarchy. First, we present a simple
and instructive derivation of this equation by considering an arbitrary
projectile wave function with small number of valence gluons. We also
generalize the equation by including corrections which incorporate effects of
high density in the projectile wave function. Second, we systematically derive
the dipole model approximation to the hierarchy. We show that in the dipole
approximation the hierarchy has a simplifying property that allows its solution
by solving the classical equation followed by averaging over the ensemble of
initial conditions.


title:
Atomic Mass Dependence of Hadron Production in Deep Inelastic Scattering
  on Nuclei

abstract:
  Hadron production in lepton-nucleus deep inelastic scattering is studied in
an absorption model. In the proposed model, the early stage of hadronization in
the nuclear medium is dominated by prehadron formation and absorption,
controlled by flavor-dependent formation lengths and absorption cross sections.
Computations for hadron multiplicity ratios are presented and compared with the
HERMES experimental data for pions, kaons, protons and antiprotons. The
mass-number dependence of hadron attenuation is shown to be sensitive to the
underlying hadronization dynamics. Contrary to common expectations for
absorption models, a leading term proportional to A^{2/3} is found. Deviations
from the leading behavior arise at large mass-numbers and large hadron
fractional momenta.


title: Structure Functions and Parton Distributions

abstract:
  I review recent progress in the determination of the parton structure of the
nucleon, in particular from deep-inelastic structure functions. I explain how
the needs of current and future precision phenomenology, specifically at the
LHC, have turned the determination of parton distributions into a quantitative
problem. I describe the results and difficulties of current approaches and
ideas to go beyond them.


title:
Dark Matter and Baryon Asymmetry of the Universe in Large-Cutoff
  Supergravity

abstract:
  We propose a consistent scenario of the evolution of the universe based on
the large cutoff supergravity (LCSUGRA) hypothesis of supersymmetry breaking,
where the gravitino and sfermion become as heavy a $\sim O(1-10 {\rm TeV})$.
With such a heavy gravitino, baryon asymmetry of the universe can be generated
by the non-thermal leptogenesis via an inflaton decay without conflicting the
serious gravitino problem. We also see that, in the LCSUGRA scenario, relic
density of the lightest superparticle becomes consistent with the WMAP value of
the dark matter density in the parameter region required for the successful
non-thermal leptogenesis.


title: A Supersymmetric Explanation of the Excess of Higgs-Like Events at LEP

abstract:
  Searches for the Standard Model Higgs boson by the four LEP experiments found
excess events in two mass ranges: a 2.3 sigma excess around 98 GeV, and an 1.7
sigma excess around 115 GeV. The latter has been discussed widely in the
literature, but the former has attracted little attention so far. In this paper
I explore the possibility of explaining the excess near 98 GeV through
production of the lighter CP--even Higgs boson in the Minimal Supersymmetric
Standard Model (MSSM). It is shown that this allows to simultaneously explain
the excess near 115 GeV through the production of the heavier CP--even MSSM
Higgs boson. The resulting light Higgs sector offers opportunities for charged
Higgs boson searches at the Tevatron and LHC. Neutral Higgs boson searches at
the LHC in the di--muon channel are also promising. However, conclusive tests
of this scenario may have to wait for the construction of a linear e+ e-
collider.


title: Flavour violation in general supergravity

abstract:
  We reappraise the flavour changing neutral currents (FCNC) problem in
string--derived supergravity models. We overview and classify possible sources
of flavour violation and find that the problem often does not arise in classes
of models which generate hierarchical Yukawa matrices. In such models,
constraints from the K- and D-meson systems leave room for substantial flavour
non-universality of the soft terms. The current B-physics experiments only
begin to probe its natural range. Correlations among different observables can
allow one to read off the chirality structure of flavour violating sources. We
briefly discuss the lepton sector where the problem of FCNC is indeed serious
and perhaps points at an additional symmetry or flavour universality.


title: ExHuME: A Monte Carlo Event Generator for Exclusive Diffraction

abstract:
  We have written the Exclusive Hadronic Monte Carlo Event (ExHuME) generator.
ExHuME implements the perturbative QCD calculation of Khoze, Martin and Ryskin
of the process pp-> p+X+p, where X is a centrally produced colour singlet
system.


title: Strong interaction and bound states in the deconfinement phase of QCD

abstract:
  Recent striking lattice results on strong interaction and bound states above
T_c can be explained by the nonperturbative Q\bar Q potential, predicted more
than a decade ago in the framework of the field correlator method. Explicit
expressions and quantitative estimates are given for Polyakov loop correlators
in comparison with lattice data. New theoretical predictions for glueballs and
baryons above T_c are given.


title:
Comparison of SUSY spectrum calculations and impact on the relic density
  constraints from WMAP

abstract:
  We compare results of four public supersymmetric (SUSY) spectrum codes,
Isajet, Softsusy, Spheno and Suspect to estimate the present-day uncertainty in
the calculation of the relic density of dark matter in mSUGRA models. We find
that even for mass differences of about 1% the spread in the obtained relic
densities can be 10%. In difficult regions of the parameter space, such as
large tan(beta) or large m_0, discrepancies in the relic density are much
larger. We also find important differences in the stau co-annihilation region.
We show the impact of these uncertainties on the bounds from WMAP for several
scenarios, concentrating on the regions of parameter space most relevant for
collider phenomenology. We also discuss the case of non-zero A_0 and the stop
co-annihilation region. Moreover, we present a web application for the online
comparison of the spectrum codes.


title:
Stability of NLO Global Analysis and Implications for Hadron Collider
  Physics

abstract:
  The phenomenology of Standard Model and New Physics at hadron colliders
depends critically on results from global QCD analysis for parton distribution
functions (PDFs). The accuracy of the standard next-to-leading-order (NLO)
global analysis, nominally a few percent, is generally well matched to the
expected experimental precision. However, serious questions have been raised
recently about the stability of the NLO analysis with respect to certain
inputs, including the choice of kinematic cuts on the data sets and the
parametrization of the gluon distribution. In this paper, we investigate this
stability issue systematically within the CTEQ framework. We find that both the
PDFs and their physical predictions are stable, well within the few percent
level. Further, we have applied the Lagrange Multiplier method to explore the
stability of the predicted cross sections for W production at the Tevatron and
the LHC, since W production is often proposed as a standard candle for these
colliders. We find the NLO predictions on sigma_W to be stable well within
their previously-estimated uncertainty ranges.


title: Study of the neutron quantum states in the gravity field

abstract:
  We have studied neutron quantum states in the potential well formed by the
earth's gravitational field and a horizontal mirror. The estimated
characteristic sizes of the neutron wave functions in the two lowest quantum
states correspond to expectations with an experimental accuracy. A
position-sensitive neutron detector with an extra-high spatial resolution of ~2
microns was developed and tested for this particular experiment, to be used to
measure the spatial density distribution in a standing neutron wave above a
mirror for a set of some of the lowest quantum states. The present experiment
can be used to set an upper limit for an additional short-range fundamental
force. We studied methodological uncertainties as well as the feasibility of
improving further the accuracy of this experiment.


title: Seesaw geometry and leptogenesis

abstract:
  The representation of the seesaw orthogonal matrix in the complex plane
establishes a graphical correspondence between neutrino mass models and
geometrical configurations, particularly useful to study relevant aspects of
leptogenesis. We first derive the CP asymmetry bound for hierarchical heavy
neutrinos and then an expression for the effective leptogenesis phase,
determining the conditions for maximal phase and placing a lower bound on the
phase suppression for generic models. Reconsidering the lower bounds on the
lightest right-handed (RH) neutrino mass M_1 and on the reheating temperature
T_reh, we find that models where one of the two heavier neutrino masses is
dominated by the lightest right-handed (RH) neutrinos, typically arising from
connections with quark masses, undergo both phase suppression and strong
wash-out such that M_1 (T_reh)\gtrsim 10^{11} (10^{10}) GeV. The window 10^9
GeV \lesssim M_1,T_reh \lesssim 10^{10}GeV is accessible only for a class of
models where m_1 is dominated by the lightest RH neutrino, with no
straightforward connections with quark masses. Within this class we describe a
new scenario of thermal leptogenesis where the baryon asymmetry of the Universe
is generated by the decays of the second lightest RH neutrino, such that the
lower bound on M_1 disappears and is replaced by a lower bound on M_2.
Interestingly, the final asymmetry is independent on the initial conditions. We
also discuss the validity of the approximation of hierarchical heavy neutrinos
in a simple analytical way.


title: Pentaquarks: Theory overview, and some more about quark models

abstract:
  After reviewing the basics, topics in this talk include an attempted survey
of theoretical contributions to this workshop, some extra specific comments on
quark models, and a summary.


title: Search for New Physics in B Decays

abstract:
  We review recent important progresses at the B factories and discuss the
future prospects. We also comment on how we might proceed to search for new
physics.


title: The interplay between high energy physics and cosmology: an example

abstract:
  Cosmology and high energy physics are two closely connected areas. In this
lecture I present an example of their rich interplay.


title: Gaps between Jets in the High Energy Limit

abstract:
  We use perturbative QCD to calculate the parton level cross section for the
production of two jets that are far apart in rapidity, subject to a limitation
on the total transverse momentum Q0 in the interjet region. We specifically
address the question of how to combine the approach which sums all leading
logarithms in Q/Q0 (where Q is the jet transverse momentum) with the BFKL
approach, in which leading logarithms of the scattering energy are summed. This
paper constitutes progress towards the simultaneous summation of all important
logarithms. Using an "all orders" matching, we are able to obtain results for
the cross section which correctly reproduce the two approaches in the
appropriate limits.


title: The lightest Higgs boson production at photon colliders in the 2HDM-III

abstract:
  The branching ratios of the lightest CP-even Higgs boson $h^0$, in the
framework of the General Two Higgs Doublet Model are calculated. Different
scenarios are presented taking into account constraints obtained in previous
works on the flavor changing neutral currents factors. Plausible scenarios with
flavour changing processes at tree level like $b \bar s$ and $t \bar c$ are
analyzed for relevant region of parameters. The loop-induced Higgs couplings to
photon pairs can be tested with a photon collider. The number of events of
$h^0$ as a resonance in photon colliders are calculated taking into account its
corresponding background signal in TESLA, CLIC and NLC.


title: Measuring the 13-mixing angle and the CP phase with neutrino telescopes

abstract:
  The observed excess of high-energy cosmic rays from the Galactic plane in the
energy range \sim 10^18 eV may be naturally explained by neutron primaries
generated in the photo-dissociation of heavy nuclei. In this scenario, neutrons
with lower energy decay before reaching the Earth and produce a detectable flux
in a 1 km^3 neutrino telescope. The initial flavor composition of these
neutrinos, \phi(\bar\nu_e):\phi(\bar\nu_\mu):\phi(\bar\nu_\tau)=1:0:0, offers
the opportunity to perform a combined \bar\nu_\mu/\bar\nu_\tau appearance and
\bar\nu_e disappearance experiment. The observable ratio
\phi(\bar\nu_\mu)/\phi(\bar\nu_e+\bar\nu_\tau) of fluxes arriving on Earth
depends appreciably on the 13-mixing angle \theta_13 and the leptonic CP phase
\delta_CP, opening thus a new experimental avenue to measure these two
quantities.


title: Fermions in odd space-time dimensions: back to basics

abstract:
  It is a well known feature of odd space-time dimensions $d$ that there exist
two inequivalent fundamental representations $A$ and $B$ of the Dirac gamma
matrices. Moreover, the parity transformation swaps the fermion fields living
in $A$ and $B$. As a consequence, a parity invariant Lagrangian can only be
constructed by incorporating both the representations. Based upon these ideas
and contrary to long held belief, we show that in addition to a discrete
exchange symmetry for the massless case, we can also define chiral symmetry
provided the Lagrangian contains fields corresponding to both the inequivalent
representations. We also study the transformation properties of the
corresponding chiral currents under parity and charge conjugation operations.
We work explicitly in 2+1 dimensions and later show how some of these ideas
generalize to an arbitrary number of odd dimensions.


title: Electromagnetic corrections to baryon masses

abstract:
  We analyze the electromagnetic contributions to the octet and decuplet baryon
masses using the heavy baryon approximation in chiral effective field theory
and methods we developed in earlier analyses of the baryon masses and magnetic
moments. Our methods connect simply to Morpurgo's general parametrization of
the electromagnetic contributions and to semirelativistic quark models. Our
calculations are carried out including the one-loop mesonic corrections to the
basic electromagnetic interactions, so to two loops overall. We find that to
this order in the chiral loop expansion there are no three-body contributions.
The Coleman-Glashow relation and other sum rules derived in quark models with
only two-body terms therefore continue to hold, and violations involve at least
three-loop processes and can be expected to be quite small. We present the
complete formal results and some estimates of the matrix elements here.
Numerical calculations will be presented separately.


title: Phenomenological Formulae for Quarks, Baryons and Mesons

abstract:
  From only two elementary quarks ($\epsilon_{u}(0) $ and $\epsilon_{d}(0)) $
and the symmetries of the regular rhombic dodecahedron, using phenomenological
formulae, we deduced the rest masses and the intrinsic quantum numbers (I, S,
C, b and Q) of a quark spectrum. The five ground quarks of the four kinds of
the deduced quarks are the five quarks of the current quark model. Then, from
the quark spectrum, using sum laws and a phenomenological binding energy
formula, we deduced a baryon spectrum. Finally, using the sum laws and a
phenomenological binding energy formula, we deduce a meson spectrum from the
quark spectrum. The intrinsic quantum numbers (I, S, C, b and Q) of the deduced
baryons and the deduced mesons are the same as those of the experimental
results. The rest masses of the deduced baryons and the deduced mesons are
consistent with the experimental results (98%). Most of the deduced quarks in
Table 11 have already been discovered by experiments. This paper infers that
there are huge constant binding energies for baryons and mesons respectively.
The huge binding energies provide a possible foundation for the confinement of
the quarks. This paper predicts many new baryons $\Lambda_{c}^{+}(6599) $,
$\Lambda {b}^{0}(9959) $ and $\Lambda ^{0}(3369) $, ...) and new mesons
(D(6231), B(9503) and $\Upsilon (17868) $, ...)


title: Cherenkov radiation in a photon gas

abstract:
  It is well-known that a charged particle moving with constant velocity in
vacuum does not radiate. In a medium the situation can be different. If the so
called Cherenkov condition is satisfied, i.e. the particle velocity exceeds the
phase speed in the medium, the particle will radiate. We show that a charge
moving with a constant velocity in a gas of photons emits Cherenkov radiation,
even in the gamma-ray regime, due to nonlinear quantum electrodynamic effects.
Our result is evaluated with respect to the radiation background in the early
universe, and it is argued that the effect can be significant.


title: Phenomenology of spin 3/2 baryons with pentaquarks

abstract:
  We examine several assignments of spin and parity for the pentaquark Theta+
state (J^P=1/2^{+,-}, 3/2^{+,-}) in connection with known baryon resonances.
Assuming that the Theta+ belongs to an antidecuplet representation which mixes
with an octet, we calculate the mass spectra of the flavor partners of the
Theta+ based on the SU(3) symmetry. The decay widths of the Theta+ and nucleon
partners are analyzed for the consistency check of the mixing angle obtained
from the masses. It is found that a suitable choice of the mixing angle
successfully reproduces the observed masses of Theta(1540) and Xi_{3/2}(1860),
when their spin and parity are assigned to be J^P=3/2^-, together with other
J^P=3/2^- resonances. The decay widths of Theta -> KN, N(1520) -> pi N, and
N(1700) -> pi N are also reproduced simultaneously.


title: On Differences Between SCET and QCDF for B->pi pi Decays

abstract:
  We give a detailed description of the differences between the factorization
and results derived from SCET and QCDF for decays B -> M1 M2. This serves as a
reply to a comment about our work "B-> M1 M2: Factorization, charming penguins,
strong phases, and polarization" [1] made by the authors in [2]. We disagree
with their criticisms.


title: Supersymmetry and precision data after LEP2

abstract:
  We study one loop supersymmetric corrections to precision observables. Adding
LEP2 e ebar --> f fbar cross sections to the data-set removes previous hints
for SUSY and the resulting constraints are in some cases stronger than direct
bounds on sparticle masses. We consider specific models: split SUSY, CMSSM,
gauge mediation, anomaly and radion mediation. Beyond performing a complete
one-loop analysis, we also develop a simple approximation, based on the Shat,
That, W, Y `universal' parameters. SUSY corrections give W,Y > 0 and mainly
depend on the left-handed slepton and squark masses, on M_2 and on mu.


title: Little-Higgs corrections to precision data after LEP2

abstract:
  We reconsider little-Higgs corrections to precision data. In five models with
global symmetries SU(5), SU(6), SO(9) corrections are (although not explicitly)
of `universal' type. We get simple expressions for the Shat, That, W, Y
parameters, which summarize all effects. In all models Shat > (W+Y)/2 and That,
W, Y\ge 0. Results differ from previous analyses, which are sometimes
incomplete, sometimes incorrect, and because we add LEP2 e ebar --> f fbar
cross sections to the data set. Depending on the model the constraint on f
ranges between 2 and 20 TeV.
  We next study the `simplest' little-Higgs model (and propose a new related
model) which is not `universal' and affects precision data due to the presence
of an extra Z' vector. By restricting the data-set to the most accurate
leptonic data we show how corrections to precision data generated by a generic
Z' can be encoded in four effective Shat, That, W, Y parameters, giving their
expressions.


title:
Probing the absolute density of the Earth's core using a vertical
  neutrino beam

abstract:
  We demonstrate that one could measure the absolute matter density of the
Earth's core with a vertical neutrino factory baseline at the per cent level
for $\sin^2 2 \theta_{13} \gtrsim 0.01$, where we include all correlations with
the oscillation parameters in the analysis. We discuss the geographical
feasibility of such an approach, and illustrate how the results change as a
function of the detector location. We point out the complementarity to
geophysics.


title: Pentaquarks in high-energy colliding experiments: perspectives from HERA

abstract:
  Several issues related to pentaquark searches relevant for current and future
high-energy colliding experiments are discussed. We make an attempt to explain
why pentaquark candidates are not seen by some experiments, and what makes the
HERA experiments so special in such searches.