title: Surprises in threshold antikaon-nucleon physics

abstract:
  Low energy \bar{K}N interactions are studied within Unitary Chiral
Perturbation Theory at next-to-leading order with ten coupled channels. We pay
special attention to the recent precise determination of the strong shift and
width of the kaonic hydrogen 1s state by the DEAR Collaboration that has
challenged our theoretical understanding of this sector of strong interactions.
We typically find two classes of solutions, both of them reproducing previous
data, that either can or cannot accommodate the DEAR measurements. The former
class has not been previously discussed.


title: Z-Z' mixing in SU(3)_C X SU(3)_L X U(1)_X models with beta arbitrary

abstract:
  We perform a chi ^{2} fit at 95% CL to obtain model-dependent bounds to Z-Z'
mixing angle theta and Z_2-mass in the framework of SU(3)_C X SU(3)_L X U(1)_X
models with beta arbitrary. Using experimental results at the Z-pole and atomic
parity violation, we obtain allowed regions according to the value of beta and
depending on the assignment of the quark families in mass eigenstates into the
three different families in weak eigenstates that cancel anomalies.


title: Role of final state interactions in the B meson decay into two pions

abstract:
  We estimate final state interactions in the B-meson decays into two pions by
the Regge model. We consider Pomeron exchange and the leading Regge
trajectories that can relate intermediate particles to the final state. In some
cases, most notably B => pi^0 pi^0 and B => pi^+ pi^-, the effect is relevant
and produces a better agreement between theory and experiment.


title: Balance of baryon number in the quark coalescence model

abstract:
  The charge and baryon balance functions are studied in the coalescence
hadronization mechanism of quark-gluon plasma. Assuming that in the plasma
phase the $q\bar{q}$ pairs form uncorrelated clusters whose decay is also
uncorrelated, one can understand the observed small width of the charge balance
function in the Gaussian approximation. The coalescence model predicts even
smaller width of the baryon-antibaryon balance function:
$\sigma_{B\bar{B}}/\sigma_{+-}= \sqrt{2/3}$.


title: Continuum physics with quenched overlap fermions

abstract:
  We calculate $m_{ud}=(m_u+m_d)/2$, $m_s$, $f_\pi$ and $f_K$ in the quenched
continuum limit with UV-filtered overlap fermions. We see rather small scaling
violations on lattices as coarse as $a^{-1} \simeq 1 \mathrm{GeV}$ and
conjecture that similar advantages would be manifest in unquenched studies.


title: A coherent study of $\chi_{c0,2}\to VV$, $PP$ and $SS$

abstract:
  We investigate the decays of $\chi_{c0,2}$ into vector meson pairs ($VV$),
pseudoscalar pairs ($PP$), and scalar pairs ($SS$) in a general factorization
scheme. The purpose is to clarify the role played by the OZI-rule violations
and SU(3) flavour breakings in the decay transitions, and their correlations
with the final state meson wavefunctions. For $\chi_{c0,2}\to VV$ and $PP$, we
obtain an overall self-contained description of the experimental data. Applying
this factorization to $\chi_{c0}\to f_0^i f_0^j$, where $i, j=1, 2, 3$ denotes
$f_0(1710)$, $f_0(1500)$ and $f_0(1370)$, respectively, we find that specific
patterns will arise from the model predictions for the decay branching ratio
magnitudes, and useful information about the structure of those three scalars
can be abstracted.


title:
Covariant tensor formalism for partial wave analyses of $\psi$ decays
  into $\gamma B\bar B$, $\gamma\gamma V$ and $\psi(2S)\to\gamma\chi_{c0,1,2}$
  with $\chi_{c0,1,2}\to K\bar K \pi^+\pi^- $ and $2\pi^+2\pi^-$

abstract:
  With accumulation of high statistics data at BES and CLEO-c, many new
interesting channels can get enough statistics for partial wave analysis (PWA).
Among them, $\psi \to \gamma p\bar p, \gamma\Lambda\bar \Lambda, \gamma\Sigma
\bar\Sigma, \gamma\Xi\bar \Xi$ channels provide a good place for studying
baryon-antibaryon interactions; the double radiative decays
$\psi\to\gamma\gamma V$ with $V\equiv \rho,\omega,\phi$ have a potential to
provide information on the flavor content of any meson resonances (R) with
positive charge parity ($C=+$) and mass above 1 GeV through $\psi\to\gamma R
\to\gamma\gamma V$; $\psi(2S)\to\gamma\chi_{c0,1,2}$ with $\chi_{c0,1,2}\to
K\bar K \pi^+\pi^- $ and $2\pi^+2\pi^-$ decays are good processes to study
$\chi_{cJ}$ charmonium decays. Using the covariant tensor formalism, here we
provide theoretical PWA formulae for these channels.


title:
Glueball-$Q\bar{Q}$ mixing and Okuba-Zweig-Iizuka rule violation in the
  hadronic decays of heavy quarkonia

abstract:
  We investigate the correlations between the scalar meson configurations and
Okuba-Zweig-Iizuka (OZI) rule violations in the hadronic decays of heavy
quarkonia, e.g. $J/\psi$ and $\Upsilon$, into isoscalar vector meson ($\phi$
and $\omega$) and scalar mesons ($f_0(1710)$, $f_0(1500)$, and $f_0(1370)$). It
shows that the dramatic change of the values of the branching ratio fraction of
$\phi f_0/\omega f_0$ from low (e.g. in $J/\psi$ decays) to high energies (e.g.
in $\Upsilon$ decays) will not only test the glueball-$Q\bar{Q}$ mixings, but
also provide important information about the mysterious OZI-rule violations
within the scalars.


title:
Comments on the possible discovery of the Higgs boson with mass ~ 160
  GeV at the Tevatron

abstract:
  The consequences of the possible discovery of the Higgs boson with a mass
around 160 - 180 GeV at the Tevatron are discussed.


title:
A formula for the sensitivity to sin^2{2theta_13} in reactor experiments
  with a spectral analysis

abstract:
  Using an analytical approach, the sensitivity to sin^2{2theta_13} with
infinite statistics in a spectral analysis is investigated in reactor neutrino
oscillation experiments with one reactor and two identical detectors. We derive
an useful formula for the sensitivity which depends only two parameters
sigma_db/\sqrt{n} (the uncorrelated bin-to-bin systematic error over the
square-root of the number of bins) and sigma_dB (the bin-to-bin correlated
detector specific systematic error).


title:
Mixed QCD and weak corrections to top quark pair production at hadron
  colliders

abstract:
  The order $\alpha_s^2 \alpha$ mixed QCD and weak corrections to top quark
pair production by quark antiquark annihilation are computed, keeping the full
dependence on the $t$ and $\bar t$ spins. We determine the contributions to the
cross section and to single and double top spin asymmetries at the parton
level. These results are necessary ingredients for precise standard model
predictions of top quark observables, in particular of top spin-induced
parity-violating angular correlations and asymmetries at hadron colliders.


title:
Electroweak corrections to top-quark pair production in quark--antiquark
  annihilation

abstract:
  Top-quark physics plays an important role at hadron colliders such as the
Tevatron at Fermilab or the LHC at CERN. Given the planned precision at these
colliders, precise theoretical predictions are required. In this paper we
present the complete electroweak corrections to QCD-induced top-quark pair
production in quark--antiquark annihilation. In particular we provide compact
analytic expressions for the differential partonic cross section, which will be
useful for further theoretical investigations.


title: Effect of absorptive corrections on inclusive parton distributions

abstract:
  We study the effect of absorptive corrections due to parton recombination on
the parton distributions of the proton. A more precise version of the GLRMQ
equations, which account for non-linear corrections to DGLAP evolution, is
derived. An analysis of HERA F_2 data shows that the small-x gluon distribution
is enhanced at low scales when the absorptive effects are included, such that a
negative gluon distribution at 1 GeV is no longer required.


title:
Chemical Potential Dependence of Chiral Quark Condensate in
  Dyson-Schwinger Equation Approach of QCD

abstract:
  We propose a chemical potential dependent effective gluon propagator and
study the chiral quark condensate in strongly interacting matter in the
framework of Dyson-Schwinger equation approach. The obtained results manifest
that, as the effect of the chemical potential on the effective gluon propagator
is taken into account, the chiral quark condensate decreases gradually with the
increasing of the chemical potential if it is less than the critical value, and
the condensate vanishes suddenly at the critical chemical potential. The
inclusion of the chemical potential in the effective gluon propagator enhances
the decreasing rate and decreases the critical chemical potential. It indicates
that the chiral symmetry can be restored completely at a critical chemical
potential and restored partially as the chemical potential is less than the
critical value. If the effective gluon propagator is independent of the
chemical potential, the chiral symmetry can only be restored suddenly but no
gradual restoration.


title: Factorization in exclusive semileptonic radiative B decays

abstract:
  We derive a new factorization relation for the semileptonic radiative decay B
-> \pi \ell \nu \gamma in the kinematical region of a slow pion p_\pi ~ \Lambda
and an energetic photon E_\gamma >> \Lambda, working at leading order in
\Lambda/m_b. In the limit of a soft pion, the nonperturbative matrix element
appearing in this relation can be computed using chiral perturbation theory. We
present a phenomenological study of this decay, which may be important for a
precise determination of the exclusive nonradiative decay.


title: Resummation

abstract:
  We review the work discussed and developed under the topic ``Resummation'' at
Working Group 2 ``Multijet final states and energy flow'', of the HERA-LHC
Workshop. We emphasise the role played by HERA observables in the development
of resummation tools via, for instance, the discovery and resummation of
non-global logarithms. We describe the event-shapes subsequently developed for
hadron colliders and present resummed predictions for the same using the
automated resummation program CAESAR. We also point to ongoing studies at HERA
which can be of benefit for future measurements at hadron colliders such as the
LHC, specifically dijet $E_t$ and angular spectra and the transverse momentum
of the Breit current hemisphere.


title: Collider Phenomenology: Basic Knowledge and Techniques

abstract:
  This is the writeup for TASI--04 lectures on Collider Phenomenology. These
lectures are meant to provide an introductory presentation on the basic
knowledge and techniques for collider physics. Special efforts have been made
for those theorists who need to know some experimental issues in collider
environments, and for those experimenters who would like to know more about
theoretical considerations in searching for new signals at colliders.


title: Looking for a Heavy Higgsino LSP in Collider and Dark Matter Experiments

abstract:
  A large part of the mSUGRA parameter space satisfying the WMAP constraint on
the dark matter relic density corresponds to a higgsino LSP of mass $\simeq 1$
TeV. We find a promising signal for this LSP at CLIC, particularly with
polarized electron and positron beams. One also expects a viable monochromatic
$\gamma$-ray signal from its pair annihilation at the galactic center at least
for cuspy DM halo profiles. All these results hold equally for the higgsino LSP
of other SUSY models like the non-universal scalar or gaugino mass models and
the so-called inverted hierarchy and more minimal supersymmetry models.


title: Tetrahedral Family Symmetry and the Neutrino Mixing Matrix

abstract:
  In a new application of the discrete non-Abelian symmetry A_4 using the
canonical seesaw mechanism, a three-parameter form of the neutrino mass matrix
is derived. It predicts the following mixing angles for neutrino oscillations:
theta_{13}=0, sin^2 theta_{23}=1/2, and sin^2 theta_{12} close, but not exactly
equal to 1/3, in one natural symmetry limit.


title:
The sensitivity of cosmic ray air shower experiments for leptoquark
  detection

abstract:
  Leptoquarks arise naturally in models attempting the unification of the quark
and lepton sectors of the standard model of particle physics. Such particles
could be produced in the interaction of high energy quasi-horizontal cosmic
neutrinos with the atmosphere, via their direct coupling to a quark and a
neutrino. The hadronic decay products of the leptoquark, and possibly its
leptonic decay products would originate an extensive air shower, observable in
large cosmic ray experiments. In this letter, the sensitivity of present and
planned very high energy cosmic ray experiments to the production of
leptoquarks of different types is estimated and discussed.


title: A modification of minimal analytic QCD at low energies

abstract:
  We present an approach which allows for modifications of the (minimal)
analytic QCD model of Shirkov, Solovtsov et al. The discontinuity function of
the (minimal) analytic QCD coupling parameter is changed at the low time-like
momenta by a simple ansatz motivated by the vector meson dominance for the
vector channel of the e+e- hadronic decay ratio R_v(s). In this way, the
additional low energy parameters introduced in the coupling parameter make it
possible to obtain the correct value of the semihadronic tau decay ratio
without having to introduce the unusually heavy quark masses of u, d and s
quarks, in contrast to the minimal analytic QCD. Some numerical results are
presented in the leading skeleton approximation for a simple version of such a
model. We hope that a more systematic analysis of such models leads to an
approximately universal coupling parameter.


title: Sensitivity of large air shower experiments for new physics searches

abstract:
  Searches for physics beyond the Standard Model of particle physics are
performed at accelerators worldwide. Although having poorer detection
capabilities and large beam uncertainties, ultra high energy cosmic ray (UHECR)
experiments present a unique opportunity to look for new physics far beyond the
TeV. Nearly horizontal energetic neutrinos, seeing a large atmospheric target
volume and with negligible background from "ordinary" cosmic rays, are ideal to
explore rare processes.
  The sensitivity of present and planned experiments to different new physics
scenarios is estimated, including mini black-holes, excited leptons and
leptoquarks.


title:
Neutral $Z$ boson pair production due to radion resonance in the
  Randall-Sundrum model: prospects at the CERN LHC

abstract:
  The Neutral $Z$ boson pair production due to radion resonance at the Large
Hadron Collider (LHC) is an interesting process to explore the notion of warped
geometry (Randall-Sundrum model). Because of the enhanced coupling of radion
with a pair of gluons due to trace enomaly and top(quark) loop, the radion can
provide larger event rate possibility as compared to any New Physics effect.
Using the proper radion-top-antitop (with the quarks being off-shell) coupling,
we obtain the correct radion production rate at LHC and explore several
features of a heavier radion decaying into a pair of real $Z$ bosons which
subsequently decays into charged $4 l (l=e, \mu)$ leptons (the gold-plated
mode). Using the signal and background event rate, we obtain bounds on radion
mass $m_\phi$ and radion vev $\vphi$ at the $5\sigma$, $10\sigma$ discovery
level.


title:
Charmless hadronic B decays involving scalar mesons: Implications to the
  nature of light scalar mesons

abstract:
  The hadronic charmless B decays into a scalar meson and a pseudoscalar meson
are studied within the framework of QCD factorization. Although the light
scalar mesons $f_0(980)$ and $a_0(980)$ are widely perceived as primarily the
four-quark bound states, in practice it is difficult to make quantitative
predictions based on the four-quark picture for light scalars. Hence,
predictions are made in the 2-quark model for the scalar mesons. Based on the
QCD sum rule method, we have derived the leading-twist light-cone distribution
amplitudes of scalar mesons and their decay constants. The short-distance
approach suffices to explain the observed large rates of $f_0(980)K^-$ and
$f_0(980)\bar K^0$ that receive major penguin contributions from the $b\to
ss\bar s$ process. When $f_0(980)$ is assigned as a four-quark bound state,
there exist extra diagrams contributing to $B\to f_0(980)K$. Therefore, a
priori the $f_0(980)K$ rate is not necessarily suppressed for a four-quark
state $f_0(980)$. The calculated $\bar B^0\to a_0^+(980)\pi^-$ and
$a_0^+(980)K^-$ rates exceed slightly the current experimental limits. If the
branching ratio of $\bar B^0\to a_0^+(1450)\pi^-$ is measured at the level of
$(4\sim 6)\times 10^{-6}$ while $a_0^+(980)\pi^-$ is found to be smaller, say,
of order $(1\sim 2)\times 10^{-6}$ or even smaller than this, it will be likely
to imply a 2-quark nature for $a_0(1450)$ and a four-quark assignment for
$a_0(980)$. The penguin-dominated modes $a_0(980)K$ and $a_0(1450)K$ receive
dominant weak annihilation contributions.


title:
Isospin Symmetry Breaking in B->K^* \gamma Decay due to an Extra
  Generation of Vector Quarks

abstract:
  The extra contributions due to an extra generation of vector-like quarks to
the isospin symmetry breaking observable associated with the radiative B->K^*
\gamma decay is obtained. It is shown that this additional contribution is
sensitive to the nonunitarity parameter U^{sb}, which is a measure of the the
strength of the non-zero tree-level flavor changing neutral current in this
model. The significance of this result is that, once accurate experimental
resultson the isospin asymmetry becomes available, one can constrain the U^{sb}
independent of the mass of the extra quarks and so a much more stringent
acceptablemodel parameter space could be obtained.


title: Gravitational complementary principle: A new approach to quantum gravity

abstract:
  A new idea of quantum gravity is developed based on {\it Gravitational
Complementary Principle}. This principle states that gravity has dual
complement features: The quantum and classical aspects of gravity are
complement and absolutely separated by the planck length into planckian and
over-planckian domains, respectively. The classical Einstein equations are
correct at the fundamental level at over-planckian domain and general
relativity is not a low energy limit of a more fundamental theory. The quantum
gravity is totally confined to the planckian domain with a new kind of
ultra-short range interaction, mediated by massive (Planck mass) particles,
through the virtual microscopic wormholes of the Planck scale with action
$\hbar$. There is no room for gravitons or extra dimensions in this scenario.
It is shown that the hierarchy problem can solve the cosmological constant
problem via this new quantum gravity.


title: Radiative Electroweak Symmetry Breaking Beyond Leading Logarithms

abstract:
  The top-quark Yukawa coupling is too large to permit radiative electroweak
symmetry breaking to occur for small values of y, the Higgs self-coupling, to
leading-logarithm order. However, a large y solution leading to a viable Higgs
mass of approximately 220 GeV does exist, and differs from conventional
symmetry breaking by an approximately five-fold enhancement of the Higgs
self-coupling. This scenario for radiative symmetry breaking is reviewed, and
the order-by-order perturbative stability of this scenario is studied within
the scalar field theory projection of the standard model in which the Higgs
self-coupling y represents the dominant standard-model coupling.


title: Dark Matter visible by the EGRET Excess of Diffuse Galactic Gamma Rays?

abstract:
  The public data from the EGRET space telescope on diffuse galactic gamma rays
in the energy range from 0.1 to 10 GeV show an excess for energies above 1 GeV
in comparison with the expectations from conventional galactic models. This
excess shows all the key features of Dark Matter Annihilation (DMA), like being
observable in al sky directions with a shape corresponding to a WIMP mass
between 50 and 100 GeV. The intensity of the excess in various directions can
be used to reconstruct the DM profile, which - combined with the distribution
of visible matter - allows to calculate the rotation curve of our Galaxy. Its
peculiar shape, which is not flat, but shows a minimum and maximum, is indeed
reconstructed from the gamma rays, thus proving that the EGRET excess traces
the DM. Furthermore, the spectral shape of the excess is consistent with mSUGRA
and the WMAP relic density for rather heavy squarks and sleptons - O(1 TeV) -
and light charginos, neutralinos and gluinos (below 500 GeV).


title: Some Implications of Neutron Mirror Neutron Oscillation

abstract:
  We comment on a recently discussed possibility of oscillations between
neutrons and degenerate mirror neutrons in the context of mirror models for
particles and forces. It has been noted by Bento and Berezhiani that if these
oscillations occurred at a rate of $\tau^{-1}_{NN'}\sim sec^{-1}$, it would
help explain putative super GKZ cosmic ray events provided the temperature of
the mirror radiation is $\sim 0.3-0.4$ times that of familiar cosmic microwave
background radiation. We discuss how such oscillation time scales can be
realized in mirror models and find that the simplest nonsupersymmetric model
for this idea requires the existence of a low mass (30-3000 GeV) color triplet
scalar or vector boson. A supersymmetric model, where this constraint can be
avoided is severely constrained by the requirement of maintaining a cooler
mirror sector. We also find that the reheat temperature after inflation in
generic models that give fast $n-n'$ oscillation be less than about 300 GeV in
order to maintain the required relative coolness of the mirror sector.


title: The Les Houches Accord PDFs (LHAPDF) and Lhaglue

abstract:
  We describe the development of the LHAPDF library from its initial
implementation following the Les Houches meeting in 2001 to its present state
as a functional replacement for PDFLIB. Brief details are given of how to
install and use the library together with the PDF sets available. We also
describe LHAGLUE, an add-on PDFLIB look-a-like interface to LHAPDF, which
facilitates using LHAPDF with existing Monte Carlo generators such as PYTHIA
and HERWIG.


title: Phase Transition Critical Flavor Number of QCD

abstract:
  We present an entirely perturbative QCD determination of the critical phase
transition flavor number $N^{cr}_{f}$ of QCD. The results obtained are compared
with various determinations of $N^{cr}_{f}$ by non-pertrubative methods,
including lattice QCD. The wider physics implication of the existence of the
Banks-Zaks regime of QCD with only weakly interacting quarks, is discussed
briefly.


title: Estimates for Pion-Photon Transition Distributions

abstract:
  In the scaling regime, amplitudes for backward virtual Compton scattering and
hadron annihilation into two photons depend on structure functions that
describe the hadron-photon transition at the partonic level. We construct
simple analytical models for the vector and axial-vector pion-photon transition
distribution amplitudes based on double distributions. Via a sum rule, these
models are tuned to reproduce the pion-photon transition form factors. To
obtain reasonable estimates of the distributions at a low scale, we modify the
models to saturate the positivity bounds using empirically parametrized parton
distributions. We also determine a model-independent contribution to the
axial-vector transition distribution using chiral perturbation theory.


title: CP-Odd Phase Effects in a Left-Right Symmetric Chargino Sector

abstract:
  The left-right supersymmetric model contains a right-handed gaugino, as well
as several higgsinos, in addition to the minimal supersymmetric model. Thus
several CP-noninvariant phases appear in this sector. We analyze their impact
on chargino masses and find that only two combinations are physically relevant.
We then study the production of charginos in e+e- annihilation and chargino
decays into a sneutrino and a lepton, and investigate the effects of CP-phases.
We also study the CP-odd asymmetry in the production and subsequent decay at
the linear collider with longitudinally polarized beams and find a large
enhancement when the decay channel to the right sneutrino is available. The
effects of the phases in the left-right supersymmetric chargino sector are
different from the minimal supersymmetric standard model, and signals from this
sector would be able to distinguish between different gauge symmetries.


title: Flavour structure of low-energy hadron pair photoproduction

abstract:
  We consider the process $\gamma\gamma\to H_1\bar H_2$ where $H_1$ and $H_2$
are either mesons or baryons. The experimental findings for such quantities as
the $p\bar p$ and $K_SK_S$ differential cross sections, in the energy range
currently probed, are found often to be in disparity with the scaling behaviour
expected from hard constituent scattering. We discuss the long-distance
pole--resonance contribution in understanding the origin of these phenomena, as
well as the amplitude relations governing the short-distance contribution which
we model as a scaling contribution. When considering the latter, we argue that
the difference found for the $K_SK_S$ and the $K^+K^-$ integrated cross
sections can be attributed to the s-channel isovector component. This
corresponds to the $\rho\omega\to a$ subprocess in the VMD
(vector-meson-dominance) language. The ratio of the two cross sections is
enhanced by the suppression of the $\phi$ component, and is hence constrained.
We give similar constraints to a number of other hadron pair production
channels. After writing down the scaling and pole--resonance contributions
accordingly, the direct summation of the two contributions is found to
reproduce some salient features of the $p\bar p$ and $K^+K^-$ data.


title: An ivestigation of triply heavy baryon production at hadron colliders

abstract:
  The triply heavy baryons have a rather diverse mass range. While some of them
possess considerable production rates at existing facilities, others need to be
produced at future high energy colliders. Here we study the direct
fragmentation production of the$\Omega_{ccc}$ and $\Omega_{bbb}$ baryons as the
prototypes of triply heavy baryons at the hadron colliders with different
$\sqrt{s}$. We present and compare the transverse momentum distributions of the
differential cross sections, $p_T^{\rm min}$ distributions of total cross
sections and the integrated total cross sections of these states at the RHIC,
the Tevatron Run II and the CERN LHC.


title:
Comment on evidence for new interference phenomena in the decay D+ -> K-
  pi+ mu+ nu

abstract:
  The experimental determination of low energy pi K scattering phase shifts
would assist in determining scattering lengths as well as low energy constants
of chiral perturbation theory for which sum rules have been constructed. The
FOCUS collaboration has presented evidence for interference pheomena from their
analysis of D_l4 decays based on decay amplitudes suitable for a cascade decay
D -> K* -> K pi. We point out that if the well-known full five body kinematics
are taken into account, pi K scattering phases may be extracted. We also point
out that other distributions considered in the context of K_l4 decays can be
applied to charm meson decays to provide constraints on violation of |Delta
I|=1/2 rule and T-violation.


title: A NJL-based study of the QCD critical line

abstract:
  We employ a 3 flavor NJL model to stress some general remarks about the QCD
critical line. The dependence of the critical curve on $\mu_q=(\mu_u+\mu_d)/2$
and $\mu_I=(\mu_u-\mu_d)/2$ is discussed. The quark masses are varied to
confirm that, in agreement with universality arguments, the order of transition
depends on the number of active flavors $N_f$. The slope of the critical curve
vs. chemical potential is studied as a function of $N_f$. We compare our
results with those recently obtained in lattice simulations to establish a
comparison among different models.


title:
Extraction of the KK-bar isovector scattering length from pp -> d K^+
  K-bar^0 data near threshold

abstract:
  The results of a recent experiment measuring the reaction pp -> dK^+ \bar K^0
near threshold are interpreted in terms of a spectator model that encapsulates
the main features of the observed K^+ \bar K^0 invariant mass distribution. A
chi^2 fit to this data leads to an imaginary part of the isovector scattering
length in the K \bar K channel of Im(a_1) = -(0.63 \pm 0.24) fm. We then use
the Flatte representation of the scattering amplitude to infer a value Re(a_1)
= -(0.02 \pm 0.02) fm for the real part under the assumption that scaling is
approximately satisfied. We show further that it is not possible to exclude the
effects of \pi^+\eta to K^+ \bar K^0 channel coupling within the context of our
model.


title: Charged Higgs Production at Linear Colliders in Large Extra Dimensions

abstract:
  In the Two-Higgs-Doublet Model(2HDM) with large extra dimensions(LED), we
study the contributions of virtual Kaluza-Klein(KK) gravitons to 2HDM charged
Higgs production, especially in the two important production processes
$e^+e^-\to H^+H^-$ and $e^+e^-\to H^-t\bar{b}$, at future linear colliders
(LC). We find that KK graviton effects can significantly modify these total
cross sections and also their differential cross sections compared to their
respective 2HDM values and, therefore, can be used to probe the effective scale
$\Lambda_T$ up to several TeV. For example, at $\sqrt{s}=2$ TeV, the cross
sections for $e^+e^-\to H^+H^-$ and $e^+e^-\to H^-t\bar{b}$ in the 2HDM are
7.4fb for $m_{H^-}=150$ GeV and 0.003fb for $m_{H^-}=1.1$ TeV and
$\tan\beta=40$, while in LED they are 12.1fb and 0.01fb, respectively, for
$\Lambda_T=4$ Tev.


title:
Gauge coupling and fermion mass relations in low string scale brane
  models

abstract:
  We analyze the gauge coupling evolution in brane inspired models with $U(3)
\times U(2) \times U(1)^N$ symmetry at the string scale. We restrict to the
case of brane configurations with two and three abelian factors (N=2,3) and
where only one Higgs doublet is coupled to down quarks and leptons and only one
to the up quarks. We find that the correct hypercharge assignment of the
Standard Model particles is reproduced for six viable models distinguished by
different brane configurations. We investigate the third generation fermion
mass relations and find that the correct low energy $m_b/m_{\tau}$ ratio can be
obtained for $b-\tau$ Yukawa coupling equality at a string scale as low as $M_S
\sim 10^3$ TeV.


title: Resonant H and A Mixing in CP-noninvariant 2HDM and MSSM

abstract:
  In the general two--Higgs--doublet model, including the minimal
supersymmetric standard model (MSSM) as its specific realization, the two heavy
neutral Higgs bosons are nearly degenerate in the decoupling limit. If the
theory is CP--noninvariant, the mixing between the heavy states can strongly be
affected by the decay widths. We develop the formalism describing this
CP--violating non--hermitian mixing and provide some interesting experimental
signatures of the CP--violating mixing at a $\gamma\gamma$ collider with
polarized beams in the context of the CP--noninvariant MSSM.


title:
Expressions for Neutrino Wave Functions and Transition Probabilities at
  Three Neutrino Oscillations in Vacuum and Some of Their Applications

abstract:
  We have considered three neutrino transitions and oscillations in the general
case and obtained expressions for neutrino wave functions in three cases: with
CP violation, without CP violations and the case when $\nu_e \leftrightarrow
\nu_\tau$ transitions are absent (some works indicate on this possibility).
Then using the existing experimental data some analysis has been fulfilled.
This analysis definitely has shown that transitions $\nu_e \leftrightarrow
\nu_\tau$ cannot be closed for the Solar neutrinos. However, this possibility
may be realized by using the mechanism of resonance enhancement neutrino
oscillations in matter (the Sun). But this possibility is not confirmed by the
Solar neutrinos spectrum (the Solar neutrinos spectrum is not distorted) and
the Day-Night effect (this effect is not observed). It was found out that the
probability of $\nu_e \leftrightarrow \nu_e$ neutrino transitions is positive
defined value only if the angle of $\nu_e, \nu_\tau$ mixing $\beta \le 15^o
\div 17^o$.


title:
Proton Lifetime and Baryon Number Violating Signatures at the LHC in
  Gauge Extended Models

abstract:
  There exist a number of models in the literature in which the weak
interactions are derived from a chiral gauge theory based on a larger group
than SU(2)_L x U(1)_Y. Such theories can be constructed so as to be
anomaly-free and consistent with precision electroweak measurements, and may be
interpreted as a deconstruction of an extra dimension. They also provide
interesting insights into the issues of flavor and dynamical electroweak
symmetry breaking, and can help to raise the mass of the Higgs boson in
supersymmetric theories. In this work we show that these theories can also give
rise to baryon and lepton number violating processes, such as nucleon decay and
spectacular multijet events at colliders, via the instanton transitions
associated with the extended gauge group. For a particular model based on
SU(2)_1 x SU(2)_2, we find that the $B+L$ violating scattering cross sections
are too small to be observed at the LHC, but that the lower limit on the
lifetime of the proton implies an upper bound on the gauge couplings.


title: Comment on "Pulsar kicks via spin-1 color superconductivity"

abstract:
  In a recent paper, Phys. Rev. Lett. 94, 211101 (2005) [hep-ph/0502166],
Schmitt et al. have proposed a new mechanism to explain the observed velocities
of pulsars. The proposed explanation is based on anisotropic emission of
neutrinos from a cooling neutron star at temperatures below 0.1 MeV, thousands
of years after the supernova. However, while neutrinos are copiously produced
during the first minute of the supernova explosion, at later times the neutrino
emission is negligible. Therefore, the proposed mechanism is not viable.


title: High-Energy Unitarity and the Standard Model

abstract:
  High-energy unitarity is argued to select a special version of QCD as the
strong interaction. Electroweak symmetry breaking has to be due to a new sextet
quark sector - that will produce large cross-section effects at the LHC. The
sextet sector embeds, uniquely, in a massless SU(5) theory that potentially
generates the states and interactions of the Standard Model within a
bound-state S-Matrix. Infra-red chirality transitions of the massless Dirac sea
play an essential dynamical role.


title: Quark Asymmetries and Intrinsic Charm in Nucleons

abstract:
  We have developed a physical model for the non-perturbative x-shape of parton
density functions in the proton, based on Gaussian fluctuations in momenta, and
quantum fluctuations of the proton into meson-baryon pairs. The model describes
the proton structure function and gives a natural explanation of observed quark
asymmetries, such as the difference between the anti-up and anti-down sea quark
distributions and between the up and down valence distributions. We find an
asymmetry in the momentum distribution of strange and anti-strange quarks in
the nucleon, large enough to reduce the NuTeV anomaly to a level which does not
give a significant indication of physics beyond the standard model. We also
consider charmed fluctuations, and show that they can explain the excess at
large x in the EMC F2c data.


title: Two-Loop Photonic Corrections to Massive Bhabha Scattering

abstract:
  We describe the details of the evaluation of the two-loop radiative photonic
corrections to Bhabha scattering. The role of the corrections in the
high-precision luminosity determination at present and future electron-positron
colliders is discussed.


title:
Charmless non-leptonic $B \to \phi K_2^{*}$ decay with a tensor
  $K_2^{*}$ meson in the final state: A Probe to New Physics

abstract:
  This paper has been withdrawn by the author due to the following reason. One
of his(author) collaborator rightly claims that the idea of this work belongs
not from the author, but from him (the collaborator).


title: Reconciling open charm production at the Fermilab Tevatron with QCD

abstract:
  We study the inclusive hadrodroduction of D^0, D^+, D^{*+}, and D_s^+ mesons
at next-to-leading order in the parton model of quantum chromodynamics endowed
with universal non-perturbative fragmentation functions (FFs) fitted to e^+e^-
annihilation data from CERN LEP1. Working in the general-mass
variable-flavor-number scheme, we resum the large logarithms through the
evolution of the FFs and, at the same time, retain the full dependence on the
charm-quark mass without additional theoretical assumptions. In this way, the
cross section distributions in transverse momentum recently measured by the CDF
Collaboration in run II at the Fermilab Tevatron are described within errors.


title: Hadron collisions and the fifth form factor

abstract:
  Logarithmically enhanced effects due to radiation of soft gluons at large
angles in $2\to 2$ QCD scattering processes are treated in terms of the "fifth
form factor" that accompanies the four collinear singular Sudakov form factors
attached to incoming and outgoing hard partons. Unexpected symmetry under
exchange of internal and external variables of the problem is pointed out for
the anomalous dimension that governs soft gluon effects in hard gluon--gluon
scattering.


title: Einstein's contributions to quantum theory

abstract:
  Einstein's revolutionary light quantum hypothesis of 1905 and his further
contributions to quantum theory are reviewed.


title:
Effective-Lagrangian approach to gamma gamma --> WW; I: Couplings and
  amplitudes

abstract:
  We consider the gauge-boson sector of a locally SU(2) x U(1) invariant
effective Lagrangian with ten dimension-six operators added to the Lagrangian
of the Standard Model. These operators induce anomalous three- and
four-gauge-boson couplings and an anomalous gamma gamma H coupling. In the
framework of this effective Lagrangian we calculate the helicity amplitudes and
differential and total cross sections for the process gamma gamma --> WW at a
photon collider. We give relations between different parts of the amplitudes
that show which linear combinations of anomalous couplings are measurable in
this reaction. The transformation properties of the differential cross section
under CP are discussed. We find that three linear combinations of CP conserving
and of CP violating couplings can be measured independently of the photon
polarisation in gamma gamma --> WW.


title:
Effective-Lagrangian approach to gamma gamma --> WW; II: Results and
  comparison with e+e- --> WW

abstract:
  We present a study of anomalous electroweak gauge-boson couplings which can
be measured in e+e- and gamma gamma collisions at a future linear collider like
ILC. We consider the gauge-boson sector of a locally SU(2) x U(1) invariant
effective Lagrangian with ten dimension-six operators added to the Lagrangian
of the Standard Model. These operators induce anomalous three- and
four-gauge-boson couplings and an anomalous gamma gamma H coupling. We
calculate the reachable sensitivity for the measurement of the anomalous
couplings in gamma gamma --> WW. We compare these results with the reachable
precision in the reaction e+e- --> WW on the one hand and with the bounds that
one can get from high-precision observables in Z decays on the other hand. We
show that one needs both the e+e- and the gamma gamma modes at an ILC to
constrain the largest possible number of anomalous couplings and that the
Giga-Z mode offers the best sensitivity for certain anomalous couplings.


title: BFKL resummation effects in gamma* gamma* --> rho rho

abstract:
  We calculate the leading order BFKL amplitude for the exclusive diffractive
process \gamma*_L(Q1^2) \gamma*_L(Q2^2) \to \rho_L^0 \rho_L^0 in the forward
direction, which can be studied in future high energy e^+e^- linear colliders.
The resummation effects are very large compared to the fixed-order calculation.
We also estimate the next-to-leading logarithmic corrections to the amplitude
by using a specific resummation of higher order effects and find a substantial
growth with energy, but smaller than in the leading logarithmic approximation.


title:
Neutron-Electron EDM Correlations in Supersymmetry and Prospects for EDM
  Searches

abstract:
  Motivated by recent progress in experimental techniques of electric dipole
moment (EDM) measurements, we study correlations between the neutron and
electron EDMs in common supersymmetric models. These include minimal
supergravity (mSUGRA) with small CP phases, mSUGRA with a heavy SUSY spectrum,
the decoupling scenario and split SUSY. In most cases, the electron and neutron
EDMs are found to be observable in the next round of EDM experiments. They
exhibit certain correlation patterns. For example, if d_n ~ 10^{-27} e cm is
found, d_e is predicted to lie in the range 10^{-28}-10^{-29} e cm.


title: Z' Signals from Kaluza-Klein Dark Matter

abstract:
  In a minimal model of universal extra dimensions the lightest Kalzua-Klein
particle is neutral and stable because of Kaluza-Klein parity conservation and
it is a dark matter candidate.
  The corresponding level 2 mode of the lightest Kaluza-Klein particle can be
detected via KK number violating decays to Standard Model particles. The
expected sensitivity to second level Kaluza-Klein modes of neutral gauge bosons
at the ILC is studied.


title:
Hadronic form factors and the $J/\psi$ secondary production cross
  section: an update

abstract:
  Improving previous calculations, we compute the $D + \bar{D} \to J/\psi + \pi
$ cross section using the most complete effective lagrangians available. The
new crucial ingredients are the form factors on the charm meson vertices, which
are determined from QCD sum rules calculations. Some of them became available
only very recently and the last one, needed for our present purpose, is
calculated in this work.


title: Multigluonic scattering amplitudes of heavy quarks

abstract:
  We consider heavy quark and antiquark off-shell spinorial currents with
emission of an arbitrary number of gluons of positive helicity. From this
results we calculate the corresponding on-shell scattering amplitude and the
quark-antiquark vector current. Then, we show that in the heavy top quark
effective theory the holomorfic component of the Higgs $\to q \bar{q} +
n$-gluon amplitude vanish for helicity conserving configurations.


title:
Electroweak Precision Observables: Two-Loop Yukawa Corrections of
  Supersymmetric Particles

abstract:
  The dominant electroweak two-loop corrections to the precision observables
M_W and s_w^eff are calculated in the MSSM. They are obtained by evaluating the
two-loop Yukawa contributions of O(alpha_t^2), O(alpha_t alpha_b), O(alpha_b^2)
to the quantity Delta rho. The result, involving the contributions from
Standard Model fermions, sfermions, Higgs bosons and higgsinos, is derived in
the gauge-less limit for arbitrary values of the lightest CP-even Higgs boson
mass. A thorough discussion of the parameter relations enforced by
supersymmetry is given, and two different renormalization schemes are applied.
Compared to the previously known result for the quark-loop contribution we find
a shift of up to +8 MeV in M_W and -4 * 10^-5 in s_w^eff. Detailed numerical
estimates of the remaining uncertainties of M_W and s_w^eff from unknown
higher-order contributions are obtained for different values of the
supersymmetric mass scale.


title: IR-Improved DGLAP Theory

abstract:
  We show that it is possible to improve the infrared aspects of the standard
treatment of the DGLAP evolution theory to take into account a large class of
higher order corrections that significantly improve the precision of the theory
for any given level of fixed-order calculation of its respective kernels. We
illustrate the size of the effects we resum using the moments of the parton
distributions.


title: Diquark-diquark correlations in the $^1S_0$ $\Lambda \Lambda$ potential

abstract:
  We derive a $\Lambda \Lambda$ potential from a chiral constituent quark model
that has been successful in describing one, two and three nonstrange baryon
systems. The resulting interaction at low energy is attractive at all distances
due to the $\sigma $ exchange term. The attraction allows for a slightly bound
state just below the $\Lambda \Lambda $ threshold. No short-range repulsive
core is found. We extract the diquark-diquark contribution that turns out to be
the most attractive and probable at small distances. At large distances the
asymptotic behavior of the $\Lambda \Lambda $ interaction provides a prediction
for the $\sigma \Lambda \Lambda $ coupling constant.


title: Nature of the light scalar mesons

abstract:
  Despite the apparent simplicity of meson spectroscopy, light scalar mesons
cannot be accommodated in the usual $q\bar q$ structure. We study the
description of the scalar mesons below 2 GeV in terms of the mixing of a chiral
nonet of tetraquarks with conventional $q\bar q$ states. A strong
diquark-antidiquark component is found for several states. The consideration of
a glueball as dictated by quenched lattice QCD drives a coherent picture of the
isoscalar mesons.


title:
Determining SUSY model parameters and masses at the LHC using
  cross-sections, kinematic edges and other observables

abstract:
  We address the problem of mass measurements of supersymmetric particles at
the Large Hadron Collider, using the ATLAS detector as an example. By using
Markov Chain sampling techniques to combine standard measurements of kinematic
edges in the invariant mass distributions of decay products with a measurement
of a missing $p_T$ cross-section, we show that the precision of mass
measurements at the LHC can be dramatically improved, even when we do not
assume that we have measured the kinematic endpoints precisely, or that we have
identified exactly which particles are involved in the decay chain causing the
endpoints. The generality of the technique is demonstrated in a preliminary
investigation of a non-universal SUGRA model, in which we relax the
requirements of mSUGRA by breaking the degeneracy of the GUT scale gaugino
masses. The model studied is compatible with the WMAP limits on dark matter
relic density.


title: A Systematic Study on Nonrelativistic Quarkonium Interaction

abstract:
  recently proposed strictly phenomenological static quark-antiquark potential
belonging to the generality $V(r)=-Ar^{-\alpha}+\kappa r^{\beta}+V_{0}$ is
tested with heavy quarkonia in the context of the shifted large N-expansion
method. This nonrelativistic potential model fits the spin-averaged mass
spectra of the $c\bar{c},$ $b\bar{b}$ and $c% \bar{b}$ quarkonia within a few
${\rm MeV}$ and also the five experimentally known leptonic decay widths of the
$c\bar{c}$ and $b% \bar{b}$ vector states. Further, we compute the hyperfine
splittings of the bottomonium spectrum as well as the fine and hyperfine
splittings of the charmonium spectrum. We give predictions for not yet observed
$B_{c}$ splittings. The model is then used to predict the masses of the
remaining quarkonia and the leptonic decay widths of the two pseudoscalar
$c\bar{b%}$ states. Our results are compared with other models to gauge the
reliability of the predictions and point out differences.


title: What if the LSND effect gets a considerably smaller amplitude?

abstract:
  The possibility is considered that the verdict of the ongoing MiniBooNE
neutrino experiment will favor neither of the contesting sides, stating in fact
that the LSND effect with the original oscillation amplitude is not confirmed,
but a new LSND effect with a considerably smaller amplitude is found (or, at
least, strongly suggested). Then, in the framework of neutrino oscillations,
the presence in Nature of hypothetical light sterile neutrinos (mixing with
three active neutrinos with a weak strength) will be unambiguously suggested by
post-MiniBooNE neutrino data (unless the credible CPT invariance is seriously
violated). In the new situation, the 3+1 neutrino models may work all right.
The same is true also for simple 3+2 neutrino models. For illustration of this
potential developement, the simplest 3+2 model is briefly discussed.


title: Lepton number violation in Little Higgs model

abstract:
  In this note we examine the constraints imposed by muon anomalous magnetic
moment ($(g-2)_\mu$) and $\mu^- \to e^+ e^- e^-$ on lepton number violating
(LNV) couplings of the triplet Higgs in Little Higgs (LH) model.


title:
Multi-Gauge-Boson Vertices and Chiral Lagrangian Parameters in Higgsless
  Models with Ideal Fermion Delocalization

abstract:
  Higgsless models with fermions whose SU(2) properties are "ideally
delocalized," such that the fermion's probability distribution is appropriately
related to the W boson wavefunction, have been shown to minimize deviations in
precision electroweak parameters. As contributions to the S parameter vanish to
leading order, current constraints on these models arise from limits on
deviations in multi-gauge-boson vertices. We compute the form of the triple and
quartic gauge boson vertices in these models and show that these constraints
provide lower bounds only of order a few hundred GeV on the masses of the
lightest KK resonances. Higgsless models with ideal fermion delocalization
provide an example of extended electroweak gauge interactions with suppressed
couplings of fermions to extra gauge-bosons, and these are the only models for
which triple-gauge-vertex measurements provide meaningful constraints. We
relate the multi-gauge couplings to parameters of the electroweak chiral
Lagrangian, and the parameters obtained in these SU(2) x SU(2) models apply
equally to the corresponding five dimensional gauge theory models of QCD. We
also discuss the collider phenomenology of the KK resonances in models with
ideal delocalization. These resonances are found to be fermiophobic, therefore
traditional direct collider searches are not sensitive to them and measurements
of gauge-boson scattering will be needed to find them.


title:
Low-Energy Neutrino Majorana Phases and Charged-Lepton Electric Dipole
  Moments

abstract:
  If the neutrinos are Majorana fermions, there are at least three new,
potentially observable CP-odd phases that parameterize CP-invariance violating
phenomena. We currently have no information regarding any of them and know that
two out of the three, the so-called Majorana phases, are very hard to access
experimentally. Here, we discuss the effect of Majorana phases on
charged-lepton electric dipole moments (EDM), and explicitly show that neutrino
Majorana phases induce EDMs even in the absence of other sources of
CP-invariance violation. We also argue that while the Majorana neutrino
contribution to EDMs is tiny, there is one generic ultraviolet completion to
the standard model plus massive Majorana neutrinos -- the standard model plus a
triplet Higgs boson -- that leads to significantly enhanced contributions which
are still proportional to the low-energy neutrino Majorana phases. If this
particular scenario is realized in nature, it seems possible, at least in
principle, to measure the Majorana phases by precisely measuring charged-lepton
EDMs.


title: Polarization States in B -> rho K* and New Physics

abstract:
  The standard-model explanations of the anomalously-large transverse
polarization fraction fT in B -> phi K* can be tested by measuring the
polarizations of the two decays B+ -> rho+ K*0 and B+ -> rho0 K*+. For the
scenario in which the transverse polarizations of both B -> rho K* decays are
predicted to be large, we derive a simple relation between the fT's of these
decays. If this relation is not confirmed experimentally, this would yield an
unambiguous signal for new physics. The new-physics operators which can account
for the discrepancy in B -> pi K decays will also contribute to the
polarization states of B -> rho K*. We compute these contributions and show
that there are only two operators which can simultaneously account for the
present B -> pi K and B -> rho K* data. If the new physics obeys an approximate
U-spin symmetry, the B -> phi K* measurements can also be explained.


title: Flavor-singlet hybrid baryons may already have been discovered

abstract:
  The splittings between the spin 1/2 and spin 3/2 iso-singlet baryons
Lambda_s(1405) and Lambda_s(1520), and their charmed counterparts
Lambda_c(2593) and Lambda_c(2625), have been a theoretical conundrum. Here we
investigate the possibility that the QCD binding of color octets comprised of
three quarks in a flavor singlet configuration is stronger than previously
envisaged, allowing these states to be interpreted as hybrids consisting of
three quarks plus a valence gluon (udsg) and (udcg). A fit of their mass
separation allows the mass prediction of the strange and charmed flavor octet
and decuplet hybrid baryons and the prediction of the mass separation of the
beauty hybrids. Such hybrid states come in parity-doubled pairs with the even
parity state lighter by about 300 MeV. Existing data accommodates either parity
assignment for the observed states and the existence of the required unobserved
partners at either higher or lower mass. We discuss difficulties with and
strategies for observing the other states under the two cases. A corollary of
the strong-binding-in-flavor-singlet-channel hypothesis is that the H-dibaryon
may be very long lived or stable with m_H ~< 2 GeV.


title: Probing Electroweak Top Quark Couplings at Hadron and Lepton Colliders

abstract:
  The International Linear Collider (ILC) will be able to precisely measure the
electroweak couplings of the top in e+e- -> tt~. We compare the limits which
can be achieved at the ILC with those which can be obtained in tt~gamma$ and
tt~Z production at the Large Hadron Collider (LHC).


title: Analyzing the Scalar Top Co-Annihilation Region at the ILC

abstract:
  The Minimal Supersymmetric Standard Model opens the possibility of
electroweak baryogenesis provided that the light scalar top quark (stop) is
lighter than the top quark. In addition, the lightest neutralino is an ideal
candidate to explain the existence of dark matter. For a light stop with mass
close to the lightest neutralino, the stop-neutralino co-annihilation mechanism
becomes efficient, thus rendering the predicted dark matter density compatible
with observations. Such a stop may however remain elusive at hadron colliders.
Here it is shown that a future linear collider provides a unique opportunity to
detect and study the light stop. The production of stops with small
stop-neutralino mass differences is studied in a detailed experimental analysis
with a realistic detector simulation including a CCD vertex detector for flavor
tagging. Furthermore, the linear collider, by precision measurements of
superpartner masses and mixing angles, also allows to determine the dark matter
relic density with an accuracy comparable to recent astrophysical observations.


title: Couplings in SO(10) Grand Unification

abstract:
  In this thesis, we develop techniques for the analysis of SO(2N) invariant
couplings which allows a full exhibition of the SU(N) invariant content of the
spinor and tensor representations. The techniques utilize a so called Basic
Theorem which we first derive. Using this method an evaluation of the trilinear
couplings of the 16 plet of matter and of the 16 and $\bar{16}$ plets Higgs is
given. In particular, we give a full determination of couplings in their SU(5)
decomposed form, involving $16 16$ and the 10, 120 and $\bar{126}$ tensor
fields together with $\bar{16} 16$ ($16 \bar{16}$) and the 1, 45 and 210 tensor
fields. We also compute the vector couplings of $16 16$ ($\bar{16} \bar{16}$)
and the 1, 45, 210 gauge fields. Computation of dimension-5 operators formed
from 16 and $\bar {16}$ arising from the mediation of 1, 10, 45 and 210 plet of
heavy Higgs, are also analyzed. Complete supersymmetric vector couplings
belonging to the singlet and the adjoint representation of the SO(10) gauge
group are computed in the Wess-Zumino gauge. An $SU(5)\times U(1)$
decomposition of the vector couplings ${16}-16-210$ is completely carried out
using the Wess-Zumino gauge and its transition to a non linear sigma type model
is shown. The utility of these results in the analysis of quark-lepton textures
and of proton decay is briefly discussed. Possible future applications of the
techniques given here such as in the development of string landscape SO(10)
type models is briefly pointed out.


title: Analysis of Stops With Small Stop-Neutralino Mass Difference at a LC

abstract:
  A compelling framework to explain dark matter and electroweak baryogenesis is
supersymmetry with light scalar top quarks (stops) and a small mass difference
between the stop and the lightest neutralino. In this work, the stop detection
capability at the ILC for small mass differences between the stop and the
neutralino is studied. The analysis is based on a fast and realistic detector
simulation. Significant sensitivity for mass differences down to 5 GeV is
obtained. It is discussed how the relevant parameters of the scalar tops can be
extracted and used to compute the dark matter density in the universe.


title: Hadron Spectroscopy - A 2005 Snapshot

abstract: Some aspects of hadron spectroscopy are reviewed as of summer 2005.


title: MSLED, Neutrino Oscillations and the Cosmological Constant

abstract:
  We explore the implications for neutrino masses and mixings within the
minimal version of the supersymmetric large-extra-dimensions scenario (MSLED).
This model was proposed in {\tt hep-ph/0404135} to extract the phenomenological
implications of the promising recent attempt (in {\tt hep-th/0304256}) to
address the cosmological constant problem. Remarkably, we find that the
simplest couplings between brane and bulk fermions within this approach can
lead to a phenomenologically-viable pattern of neutrino masses and mixings that
is also consistent with the supernova bounds which are usually the bane of
extra-dimensional neutrino models. Under certain circumstances the MSLED
scenario can lead to a lepton mixing (PMNS) matrix close to the so-called
bi-maximal or the tri-bimaximal forms (which are known to provide a good
description of the neutrino oscillation data). We discuss the implications of
MSLED models for neutrino phenomenology.


title: SCET sum rules for heavy-to-light form factors

abstract:
  We consider a sum rule for heavy-to-light form factors in soft-collinear
effective theory (SCET). Using the correlation function given by the
time-ordered product of a heavy-to-light current and its hermitian conjugate,
the heavy-to-light soft form factor zeta_P can be related to the leading-order
B meson shape function. Using the scaling behavior of the heavy-to-light form
factor in Lambda_QCD/m_b, we put a constraint on the behavior of the $B$ meson
shape function near the endpoint. We employ the sum rule to estimate the size
of zeta_P with the model for the shape function and find that it ranges from
0.01 to 0.07.


title:
The Fermi motion contribution to J/\psi production at the hadron
  colliders

abstract:
  We investigate the relativistic Fermi motion effect in the case of $J/\psi$
production in various hadron colliders. A light-cone wave function is adopted
to represent the $J/\psi$ final state. The change in the confinement parameter
which sets a scale for the size of the final state, allows one to see the
effect in an explicit manner. While the effect has considerable influence on
the fragmentation probabilities and the differential cross sections, the total
cross sections are essentially left unchanged. such a feature is in agreement
with the momentum sum rule which the fragmentation functions should satisfy.


title: Problems in resumming interjet energy flows with k_t clustering

abstract:
  We consider the energy flow into gaps between hard jets. It was previously
believed that the accuracy of resummed predictions for such observables can be
improved by employing the $k_t$ clustering procedure to define the gap energy
in terms of a sum of energies of soft jets (rather than individual hadrons) in
the gap. This significantly reduces the sensitivity to correlated soft
large-angle radiation (non-global leading logs), numerically calculable only in
the large $N_c$ limit. While this is the case, as we demonstrate here, the use
of $k_t$ clustering spoils the straightforward single-gluon Sudakov
exponentiation that multiplies the non-global resummation. We carry out an
${\mathcal{O}}(\alpha_s^2)$ calculation of the leading single-logarithmic terms
and identify the piece that is omitted by straightforward exponentiation. We
compare our results with the full ${\mathcal{O}} (\alpha_s^2)$ result from the
program EVENT2 to confirm our conclusions. For $e^{+}e^{-} \to 2$ jets and DIS
(1+1) jets one can numerically resum these additional contributions as we show,
but for dijet photoproduction and hadron-hadron processes further studies are
needed.


title:
Unification via intermediate symmetry breaking scales with the
  quartification gauge group

abstract:
  The idea of quark-lepton universality at high energies has been introduced as
a natural extension to the standard model. This is achieved by endowing leptons
with new degrees of freedom -- leptonic colour, an analogue of the familiar
quark colour. Grand and partially unified models which utilise this new gauge
symmetry SU(3)_\ell have been proposed in the context of the quartification
gauge group SU(3)^4. Phenomenologically successful gauge coupling constant
unification without supersymmetry has been demonstrated for cases where the
symmetry breaking leaves a residual SU(2)_\ell unbroken. Though attractive,
these schemes either incorporate ad hoc discrete symmetries and
non-renormalisable mass terms, or achieve only partial unification. We show
that grand unified models can be constructed where the quartification group can
be broken fully [i.e. no residual SU(2)_\ell] to the standard model gauge group
without requiring additional discrete symmetries or higher dimension operators.
These models also automatically have suppressed nonzero neutrino masses. We
perform a systematic analysis of the renormalisation-group equations for all
possible symmetry breaking routes from SU(3)^4 --> SU(3)_q x SU(2)_L x U(1)_Y.
This analysis indicates that gauge coupling unification can be achieved for
several different symmetry breaking patterns and we outline the requirements
that each gives on the unification scale. We also show that the unification
scenarios of those models which leave a residual SU(2)_\ell symmetry are not
unique. In both symmetry breaking cases, some of the scenarios require new
physics at the TeV scale, while others do not allow for new TeV phenomenology
in the fermionic sector.


title: The impact of beamstrahlung on precision measurements at CLIC

abstract:
  We review two commonly used approximate treatments of beamstrahlung at lepton
colliders. We discuss the applicability of those approximations and show that
they are bound to fail at very high energy $e^+e^-$ colliders such as CLIC. We
model the beamstrahlung effects at CLIC by an exact numerical solution to the
evolution equation for beamstrahlung and compare to the two approximations. We
also discuss the impact of beamstrahlung on precision measurements of new
physics parameters. As an illustration we consider Kaluza-Klein lepton
production in Universal Extra Dimensions and study the deterioration of the
endpoint lepton energy spectrum caused by beamstrahlung.


title:
Electroproduction of two light vector mesons in the next-to-leading
  approximation

abstract:
  We calculate the amplitude for the forward electroproduction of two light
vector mesons in next-to-leading order BFKL. This amplitude is written as a
convolution of two impact factors for the virtual photon to light vector meson
transition with the BFKL Green's function. It represents the first
next-to-leading order amplitude ever calculated for a collision process between
strongly interacting colorless particles.


title:
Infrared degrees of freedom of Yang-Mills theory in the Schroedinger
  representation

abstract:
  We set up a new calculational framework for the Yang-Mills vacuum transition
amplitude in the Schroedinger representation. After integrating out hard-mode
contributions perturbatively, we perform a gauge invariant gradient expansion
of the ensuing soft mode action which renders a subsequent saddle point
expansion for the vacuum overlap manageable. The standard "squeezed"
approximation for the vacuum wave functional then allows for an essentially
analytical treatment of physical amplitudes. Moreover, it leads to the
identification of dominant and gauge invariant classes of gauge field orbits
which play the role of gluonic infrared (IR) degrees of freedom. Those emerge
as a rich variety of (mostly solitonic) solutions to the saddle point equations
which are characterized by a common relative gauge orientation of the
underlying gluon fields. We discuss their scale stability, guaranteed by a
virial theorem, and other general properties including topological quantum
numbers and action bounds. We then find important saddle point solutions
explicitly and examine their physical impact. Some of them are related to
tunneling solutions of the classical Yang-Mills equation, i.e. to instantons
and merons, while others appear to play unprecedented roles. A remarkable new
class of IR degrees of freedom comprises vortex and knot solutions of
Faddeev-Niemi type, potentially related to glueballs.


title: The convolution formula for a decay rate

abstract:
  The convolution formula is derived within the framework of the decay-chain
method for decay channels with three and four particles in a final state. To
get this formula exactly for unstable particle of any type one must modify the
propagators of vector and spinor fields. In this work we suggest proper
modifications and get the convolution formula by direct calculation. It was
noted that this approach naturally arises in the model of unstable particles
with random mass.


title:
The Rare Decay K^+ -> pi^+ nu nubar at the Next-to-Next-to-Leading Order
  in QCD

abstract:
  We calculate the charm quark contribution to the rare decay K+ -> pi+ nu
anti-nu in the next-to-next-to-leading order of QCD. This new contribution
reduces the theoretical uncertainty in the relevant parameter Pc from +/- 10.1%
down to +/- 2.4%, corresponding to scale uncertainties of +/- 1.3%, +/- 1.0%,
+/- 0.006 and +/- 1.2 degrees in BR(K+ -> pi+ nu anti-nu) and in |V_td|, sin(2
beta) and gamma extracted from the K -> pi nu anti-nu system. The error in Pc =
0.37 +/- 0.04 is now fully dominated by the current uncertainty of +/- 3.8% in
the charm quark mass mc. We find BR(K+ -> pi+ nu anti-nu) = (8.0 +/- 1.1) *
10^-11, where the quoted error stems almost entirely from the present
uncertainties in mc and the Cabibbo-Kobayashi-Maskawa elements.


title:
SU_L(2) X U_Y(1)-invariant description of the bilepton contribution to
  the WWV vertex in the minimal 331 model

abstract:
  We study the one-loop sensitivity of the WWV (V=gamma, Z) vertex to the new
massive gauge bosons predicted by the minimal SU_L(3) X U_X(1) model, which
have unusual couplings to the standard model (SM) gauge bosons. A gauge-fixing
procedure covariant under the SU_L(2) X U_Y(1) group was introduced for these
new gauge bosons (dubbed bileptons) in order to generate gauge-invariant Green
functions. The similarities between this procedure and the nonconventional
quantization scheme of the background field method are discussed. It is found
that, for relatively light bileptons, with a mass ranging from 2m_W to 6m_W,
the radiative corrections to the form factors associated with the WWV vertex
can be of the same order of magnitude than the SM one. In the case of heavier
bileptons, their contribution is smaller by about one and two orders of
magnitude than their SM counterpart.


title: SUSY Studies

abstract:
  This report summarizes the progress in SUSY studies performed since the last
International Linear Collider Workshop in Paris (LCWS04).


title: Physics Gain of a Precise m_t Measurement

abstract:
  The top quark mass is currently measured to delta m_t^{exp,Tevatron} = 2.9
GeV and will be measured at the LHC to a precision of delta m_t^{exp,LHC}
\approx 1-2 GeV. We show that even this impressive precision will not be
sufficient for many future physics applications. These include electroweak
precision observables, Higgs physics in extensions of the Standard Model as
well as cold dark matter predictions in Supersymmetry. The desired experimental
precision can only be reached at the ILC with delta m_t^{exp,ILC} \approx 100
MeV.


title: Sensitivities to the SUSY Scale from Electroweak Precision Observables

abstract:
  Precision measurements, now and at a future linear electron-positron collider
(ILC), can provide indirect information about the possible scale of
supersymmetry. Performing a chi^2 analysis, we illustrate the present-day and
possible future ILC sensitivities within the constrained minimal supersymmetric
extension of the Standard Model (CMSSM), varying the parameters so as to obtain
the cold dark matter density allowed by WMAP and other cosmological data. The
current data are in very good agreement with the CMSSM prediction for tan beta
= 10, with a clear preference for relatively small values of the universal
gaugino mass, m_{1/2} \sim 300 GeV. In this case, there would be good prospects
for observing supersymmetry directly at both the LHC and the ILC, and some
chance already at the Tevatron collider. For tan beta = 50, the quality of the
fit is worse, and somewhat larger m_{1/2} values are favoured. With the
prospective ILC accuracies the sensitivity to indirect effects of supersymmetry
greatly improves. This may provide indirect access to supersymmetry even at
scales beyond the direct reach of the LHC or the ILC.


title: The International Linear Collider as a Kaluza-Klein Factory

abstract:
  In the minimal Universal Extra Dimension model, single production of n = 2
gauge bosons provides a unique discriminating feature from supersymmetry. We
discuss how the proposed International Linear Collider can act as a n = 2
factory, much in the same vein as LEP. We also touch upon the potential of the
gamma-gamma mode of the collider to study the production and the decay of an
intermediate mass Higgs boson and its KK excitations.


title:
Possibility of Searching for Fourth Generation Neutrino at Future ep
  Colliders

abstract:
  We investigate the production of fourth generation neutrino in the context of
new $e \nu_4 W$ magnetic dipole moment type interaction in $ep$ collisions at
the future lepton-hadron colliders. We have obtained the mass limits of 700 GeV
for THERA ($\sqrt S$=1 TeV) and 2.8 TeV for LC$\otimes$ LHC ($\sqrt S$=3.74
TeV).


title: Hiding cosmic strings in supergravity D-term inflation

abstract:
  The influence of higher-order terms in the K\"{a}hler potential of the
supergravity D-term inflation model on the density perturbation is studied. We
show that these terms can make the inflaton potential flatter, which lowers the
energy scale of inflation under the COBE/WMAP normalization. As a result, the
mass per unit length of cosmic strings, which are produced at the end of
inflation, can be reduced to a harmless but detectable level without
introducing a tiny Yukawa coupling. Our scenario can naturally be implemented
in models with a low cut-off as in Type I or Type IIB orientifold models.


title: Evaluating massive planar two-loop tensor vertex integrals

abstract:
  Using the parallel/orthogonal space method, we calculate the planar two-loop
three-point diagram and two rotated reduced planar two-loop three-point
diagrams. Together with the crossed topology, these diagrams are the most
complicated ones in the two-loop corrections necessary, for instance, for the
decay of the Z^0 boson. Instead of calculating particular decay processes, we
present the new algorithm which allows one to calculate arbitrary NNLO
calculations for massive planar two-loop vertex functions in the general mass
case. All integration steps up to the last two ones are performed analytically
and will be implemented under xloops as part of the Mainz xloops-GiNaC project.
The last two integrations are done numerically using methods like VEGAS and
Divonne. Thresholds originating from Landau singularities are found and
discussed in detail. In order to demonstrate the numeric stability of our
methods we consider particular Feynman integrals which contribute to different
physical processes. Our results can be generalized to the case of the crossed
topology.


title: Identification of large extra spatial dimensions at the LC

abstract:
  We discuss the possibility to cleanly distinguish, in electron-positron
annihilation into fermion pairs at a high energy collider, the indirect
manifestations of graviton exchange from those of four-fermion contact
interactions. The method is based on cross section asymmetries emphasizing the
spin-2 character of graviton exchange and is explicitly applied to the ADD
scenario for gravity in extra dimensions. The availability of initial beams
longitudinal polarization is also taken into account. For typical c.m. energies
and time-integrated luminosities foreseen at the International Linear Collider
[\sqrt s=0.5-1 TeV, L_{int}=50-1000 fb^{-1}], a 5\sigma identification reach as
high as 3.5-5.8 TeV for the mass scale M_H relevant to the ADD model can be
obtained, while the size of the reach on the mass scales Lambda characterizing
four-fermion contact interactions can be of the order of 45-65 TeV.


title: Non-standard Hamiltonian effects on neutrino oscillations

abstract:
  We investigate non-standard Hamiltonian effects on neutrino oscillations,
which are effective additional contributions to the vacuum or matter
Hamiltonian. Since these effects can enter in either flavor or mass basis, we
develop an understanding of the difference between these bases representing the
underlying theoretical model. In particular, the simplest of these effects are
classified as ``pure'' flavor or mass effects, where the appearance of such a
``pure'' effect can be quite plausible as a leading non-standard contribution
from theoretical models. Compared to earlier studies investigating particular
effects, we aim for a top-down classification of a possible ``new physics''
signature at future long-baseline neutrino oscillation precision experiments.
We develop a general framework for such effects with two neutrino flavors and
discuss the extension to three neutrino flavors, as well as we demonstrate the
challenges for a neutrino factory to distinguish the theoretical origin of
these effects with a numerical example. We find how the precision measurement
of neutrino oscillation parameters can be altered by non-standard effects alone
(not including non-standard interactions in the creation and detection
processes) and that the non-standard effects on Hamiltonian level can be
distinguished from other non-standard effects (such as neutrino decoherence and
decay) if we consider specific imprint of the effects on the energy spectra of
several different oscillation channels at a neutrino factory.


title: A strongly interacting SU(2) pure gauge theory and the nature of light

abstract:
  We present quantitative and qualitative arguments in favor of the claim that,
within the present cosmological epoch, the U(1)$_Y$ factor in the Standard
Model is an effective manifestation of SU(2) pure gauge dynamics of Yang-Mills
scale $\Lambda\sim 10^{-4}$ eV. Results for the pressure and the energy density
in the deconfining phase of this theory, obtained in a nonperturbative and
analytical way, support this connection in view of large-angle features
inherent in the map of the CMB temperature fluctuations and
temperature-polarization cross correlations.


title:
Realistic search for doubly charged bileptons at linear $e^{-}e^{-}$
  collider energies

abstract:
  We search for doubly charged scalar bileptons via $
\text{e}^{-}\text{e}^{-}\to \mu^{-}\mu^{-}$ and $ \text{e}^{-}\text{e}^{-}\to
\text{e}^{-}\text{e}^{-}$ processes at linear collider energies by considering
initial and final state electromagnetic radiative corrections (ISR, FSR).
Moreover, smeared cross section is used for finite energy resolution. We show
that ISR+FSR and smearing reduce cross sections remarkably depending on the
smearing parameter due to narrow decay width of bileptons. We obtain realistic
discovery contours of couplings and masses for the lepton flavour conserving
and violating processes.


title:
A two-loop relation between inclusive radiative and semileptonic B-decay
  spectra

abstract:
  A shape-function independent relation is derived between the partial
B->X_u+l+nu decay rate with a cut on P_+=E_X-P_X<Delta and a weighted integral
over the normalized B->X_s+gamma photon-energy spectrum. The leading-power
contribution to the weight function is calculated at next-to-next-to-leading
order in renormalization-group improved perturbation theory, including exact
two-loop matching corrections at the scale mu_i^2 ~ m_b*Lambda_{QCD}. The
overall normalization of the weight function is obtained up to yet unknown
corrections of order [alpha_s(m_b)]^2. Power corrections from phase-space
factors are included exactly, while the remaining subleading contributions are
included at first order in 1/m_b. At this level unavoidable hadronic
uncertainties enter, which are estimated in a conservative way. The combined
theoretical accuracy in the extraction of |V_{ub}| is at the level of 5% if a
value of Delta near the charm threshold can be achieved experimentally.


title:
Experimental studies of Strong Electroweak Symmetry Breaking in gauge
  boson scattering and three gauge boson production

abstract:
  If no light Higgs boson exist, the interaction among the gauge bosons becomes
strong at high energies (~1TeV). The effects of strong electroweak symmetry
breaking (SEWSB) could manifest themselves as anomalous couplings before they
give rise to new physical states, thus measurement of all couplings and their
possible deviation from Standard Model (SM) values could give valuable
information for understanding the true nature of symmetry breaking sector. Here
we present a detailed study of the measurement of quartic gauge couplings in
weak boson scattering processes and a possibility for same measurement in
triple weak boson production. Expected limits on the parameters alpha_4
alpha_5,alpha_6, alpha_7 and alpha_10 in electroweak chiral Lagrangian are
given.


title:
Spontaneous Superfluid Current Generation in CFL at Nonzero Strange
  Quark Mass

abstract:
  We find that for large enough strange quark mass, $m_s^2/4 \mu
\Delta>2/3(1-0.024),$ kaon condensed CFL phase of asymptotically dense 3 flavor
quark matter is unstable with respect to spontaneous generation of currents of
Nambu Goldstone bosons due to spontaneous breaking of baryon number symmetry
and hypercharge symmetry in CFL$K^0$ ground state. The total baryon and
hypercharge currents still vanish in the ground state. We find that CFL$K^0$
and the new state are separated by the first order phase transition.


title: The LHC and the ILC

abstract:
  The synergy between the Large Hadron Collider and the International Linear
Collider during concurrent running of the two machines has the potential to
maximise the physics gain from both facilities. Some examples of detailed case
studies of the interplay between the LHC and ILC are given, with a particular
emphasis on new results that have been obtained after the first LHC / ILC Study
Group report was released.


title: New Physics at the TeV Scale and Precision Electroweak Studies

abstract:
  In this summary we review some recent developments in New Physics at the TeV
scale. We concentrate on measurements at the ILC that can distinguish between
some of the models that have recently been discussed, concentrating on results
presented at this workshop: The Little Higgs Model, models of Large Extra
Dimensions; Randall-Sundrum (RS), Arkani-Hamed Dimopoulos Dvali (ADD), and
Universal Extra Dimensions (UED). Some recent results on constraining effective
Lagrangian parametrizations of new physics are also presented.


title:
Optimal Beam Polarizations for New-Physics Search through gamma gamma ->
  t tbar -> lX/bX

abstract:
  We perform an optimal-observable analysis of the final charged-lepton/b-quark
momentum distributions in gamma+gamma -> t+tbar -> lX/bX for various beam
polarizations in order to study possible anomalous t-tbar-gamma, tbW and
gamma-gamma-H couplings, which could be generated by SU(2)xU(1) gauge-invariant
dimension-6 effective operators. We find optimal beam polarizations that will
minimize the uncertainty in determination of those non-standard couplings. We
also compare e+ebar and gamma+gamma colliders from the viewpoint of the
anomalous-top-quark-coupling determination.


title: Light-Cone Models for Intrinsic Charm and Bottom

abstract:
  Expectations for the momentum distribution of nonperturbative charm and
bottom quarks in the proton are derived from a variety of models for the Fock
space wave function on the light cone.


title: Phenomenology of Higgsless Models at the LHC and the ILC

abstract:
  We investigate the signatures of the recently proposed Higgsless models at
future colliders. We focus on tests of the mechanism of partial unitarity
restoration in the longitudinal vector boson scattering, which do not depend on
any Higgsless model-building details. We study the LHC discovery reach for
charged massive vector boson resonances and show that all of the preferred
parameter space will be probed with $100 {\rm fb}^{-1}$ of LHC data. We also
discuss the prospects for experimental verification of the Higgsless nature of
the model at the LHC. In addition, in this talk we present new results relevant
for the discovery potential of Higgsless models at the International Linear
Collider (ILC).


title: Naturally light right-handed neutrinos in a 3-3-1 Model

abstract:
  In this work we show that light right-handed neutrinos, with mass in the
sub-eV scale, is a natural outcome in a 3-3-1 model. By considering effective
dimension five operators, the model predicts three light right-handed
neutrinos, weakly mixed with the left-handed ones. We show also that the model
is able to explain the LSND experiment and still be in agreement with solar and
atmospheric data for neutrino oscillation.


title: Charged currents, color dipoles and xF_3 at small x

abstract:
  We develop the light-cone color dipole description of highly asymmetric
diffractive interactions of left-handed and right-handed electroweak bosons. We
identify the origin and estimate the strength of the left-right asymmetry
effect in terms of the light-cone wave functions. We report an evaluation of
the small-x neutrino-nucleon DIS structure functions xF_3 and 2xF_1 and present
comparison with experimental data.


title:
Correlating Strangeness Enhancement and J/psi Suppression in Heavy Ion
  Collisions at sqrt(s)_NN = 17.2 GeV

abstract:
  It is shown that the strangeness enhancement and the J/psi anomalous
suppression patterns observed in heavy ion collisions at top SPS energy,
sqrt(s)_NN = 17.2 GeV, exhibit an interesting correlation if studied as a
function of the transverse size of the interaction region. The onset of both
phenomena seems to occur when the size exceeds \approx 4 fm. Strangeness
enhancement is defined in terms of the strangeness undersaturation factor
gamma_S and J/psi anomalous suppression in terms of the deviation from the
absorption expected in a purely hadronic scenario.


title:
Radiative Kaon Decays and the Penguin Contribution to the Delta I = 1/2
  Rule

abstract:
  A consistent census of penguins in the Delta I = 1/2 rule is taken from the
eta0 pole contribution to the radiative KL to gamma gamma, KS to pi0 gamma
gamma and K+ to pi+ gamma gamma decay modes. We briefly comment on its impact
for KL to pi0 pi0 gamma gamma, KL to pi+ pi- gamma and check its compatibility
with the KL - KS mass difference and the CP violating epsilon-prime / epsilon
parameter.


title: Meson Supercurrent State in High Density QCD

abstract:
  We study the effect of a non-zero strange quark mass on the
color-flavor-locked (CFL) phase of high density quark matter. We have
previously shown that for a strange quark mass $m_s\sim m_u^{1/3}\Delta^{2/3}$
the CFL state becomes unstable toward the formation of a neutral kaon
condensate. Recently, several authors discovered that for $m_s\sim (2\Delta
p_F)^{1/2}$ the CFL state contains gapless fermions, and that the gapless modes
lead to an instability in current-current correlation functions. Using an
effective theory of the CFL state we demonstrate that this instability is
resolved by the formation of an inhomogeneous meson condensate, analogous to
Migdal's p-wave pion condensate. This state has a non-zero meson current which
is canceled by a backflow of gapless fermions.


title: Quantization as a Necessary Condition for Gauge Invariance

abstract:
  Symmetry and quantization are the two major enterprises of theoretical
physics; but some argue that quantization can be derived as a necessary
condition for symmetry. It is argued here that the Heisenberg uncertainty
principle is a necessary condition for gauge invariance in the 5-dimensional
Kaluza-Klein theory.


title: Pion-nucleon Sigma Term in the Global Color Model of QCD

abstract:
  We study the pion-nucleon sigma term in vacuum and in nuclear matter in the
framework of global color model of QCD. With the effective gluon propagator
being taken as the $\delta$-function in momentum space of Munczek-Nomirovsky
model, we estimate that the sigma term at chiral limit in the vacuum is 9/2
times the current quark mass and it decreases with the nuclear matter density.
With the presently obtained in-medium pion-nucleon sigma term, we study the
in-medium chiral quark condensate and obtain a reasonable variation behavior
against the nuclear matter density.


title: HadAtom05, Workshop on Hadronic Atoms

abstract:
  These are the proceedings of the workshop "HadAtom05", held at the University
of Bern, Switzerland, February 15 and 16, 2005. The main topics of the workshop
concerned the physics of hadronic atoms, and in this context recent results
from experiments and theory were presented. These proceedings contain the list
of participants, the scientific program and a short contribution from each
speaker.


title: Analytic epsilon-Expansion of the Scalar One-loop Bhabha Box Function

abstract:
  We derive the first three terms of the epsilon-expansion of the scalar
one-loop Bhabha box function from a representation in terms of three
generalized hypergeometric functions, which is valid in arbitrary dimensions.


title: Real-time Chern-Simons term for hypermagnetic fields

abstract:
  If non-vanishing chemical potentials are assigned to chiral fermions, then a
Chern-Simons term is induced for the corresponding gauge fields. In thermal
equilibrium anomalous processes adjust the chemical potentials such that the
coefficient of the Chern-Simons term vanishes, but it has been argued that
there are non-equilibrium epochs in cosmology where this is not the case and
that, consequently, certain fermionic number densities and large-scale
(hypermagnetic) field strengths get coupled to each other. We generalise the
Chern-Simons term to a real-time situation relevant for dynamical
considerations, by deriving the anomalous Hard Thermal Loop effective action
for the hypermagnetic fields, write down the corresponding equations of motion,
and discuss some exponentially growing solutions thereof.


title: The Missing Odderon

abstract:
  In contrast to theoretical expectations, experimental results at sqrt(s)=200
GeV for the reaction gamma p --> pi0 X show no evidence for odderon exchange.
The upper limit on the cross section is an order of magnitude smaller than the
theoretical estimate. It is argued that chiral symmetry leads to a large
suppression, taking the thoeretical estimates well below the data. Two
additional arguments are presented which may decrease the theoretical estimate
further. The calculations are more sensitive to the assumptions made in
evaluating the hadronic scattering amplitude than in the processes considered
previously and lattice gauge calculations indicate that the odderon intercept
may be appreciably lower than usually assumed. These two latter effects are
particularly relevant for the reactions gamma p --> f2(1270)X and gamma p -->
a2(1320)X for which the data upper limits are also below the theoretical
predictions, but not so dramatically as for gamma p --> pi0 X.


title: A note on color neutrality in NJL-type models

abstract:
  By referring to the underlying physics behind the color charge neutrality
condition in quark matter, we discuss how this condition should be properly
imposed in NJL-type models in a phenomenologically meaningful way. In
particular, we show that the standard assumption regarding the use of two color
chemical potentials, chosen in a very special way, is not justified in general.
When used uncritically, such an approach leads to wrong or unphysical
conclusions.


title:
Supersymmetric Benchmarks with Non-Universal Scalar Masses or Gravitino
  Dark Matter

abstract:
  We propose and examine a new set of benchmark supersymmetric scenarios, some
of which have non-universal Higgs scalar masses (NUHM) and others have
gravitino dark matter (GDM). The scalar masses in these models are either
considerably larger or smaller than the narrow range allowed for the same
gaugino mass m_{1/2} in the constrained MSSM (CMSSM) with universal scalar
masses m_0 and neutralino dark matter. The NUHM and GDM models with larger m_0
may have large branching ratios for Higgs and/or $Z$ production in the cascade
decays of heavier sparticles, whose detection we discuss. The phenomenology of
the GDM models depends on the nature of the next-to-lightest supersymmetric
particle (NLSP), which has a lifetime exceeding 10^4 seconds in the proposed
benchmark scenarios. In one GDM scenario the NLSP is the lightest neutralino
\chi, and the supersymmetric collider signatures are similar to those in
previous CMSSM benchmarks, but with a distinctive spectrum. In the other GDM
scenarios based on minimal supergravity (mSUGRA), the NLSP is the lighter stau
slepton {\tilde \tau}_1, with a lifetime between ~ 10^4 and 3 X 10^6 seconds.
Every supersymmetric cascade would end in a {\tilde \tau}_1, which would have a
distinctive time-of-flight signature. Slow-moving {\tilde \tau}_1's might be
trapped in a collider detector or outside it, and the preferred detection
strategy would depend on the {\tilde \tau}_1 lifetime. We discuss the extent to
which these mSUGRA GDM scenarios could be distinguished from gauge-mediated
models.


title:
On the Existence of Heavy Pentaquarks: The large Nc and Heavy Quark
  Limits and Beyond

abstract:
  We present a very general argument that the analogue of a heavy pentaquark (a
state with the quantum numbers of a baryon combined with an additional light
quark and a heavy antiquark) must exist as a particle stable under strong
interactions in the combined heavy quark and large Nc limits of QCD. Moreover,
in the combined limit these heavy pentaquark states fill multiplets of
SU(4)xO(8)xSU(2). We explore the question of whether corrections in the
combined 1/Nc and 1/mQ expansions are sufficiently small to maintain this
qualitative result. Since no model-independent way is known to answer this
question, we use a class of ``realistic'' hadronic models in which a pentaquark
can be formed via nucleon-heavy meson binding through a pion-exchange
potential. These models have the virtue that they necessarily yield the correct
behavior in the combined limit, and the long-distance parts of the interactions
are model independent. If the long-distance attraction in these models were to
predict bound states in a robust way (i.e., largely insensitive to the details
of the short-range interaction), then one could safely conclude that heavy
pentaquarks do exist. However, in practice the binding does depend very
strongly on the details of the short-distance physics, suggesting that the real
world is not sufficiently near the combined large Nc, mQ limit to use it as a
reliable guide. Whether stable heavy pentaquarks exist remains an open
question.


title: Near Forward pp Elastic Scattering at LHC and Nucleon Structure

abstract:
  High energy proton-proton and antiproton-proton elastic scattering are
studied first in a model where the nucleon has an outer cloud and an inner
core. Elastic scattering is viewed as due to two processes: a) diffraction
scattering originating from cloud-cloud interaction; b) a hard or large |t|
scattering originating from one nucleon core scattering off the other via
vector meson omega exchange, while their outer clouds interact independently.
The omega-exchange amplitude shows that omega behaves like an elementary vector
meson at high energy, contrary to a regge pole behavior. This behavior,
however, can be understood in the nonlinear sigma-model where omega couples to
a topological baryonic current like a gauge boson, and the nucleon is described
as a topological soliton. Further investigation shows that the underlying
effective field theory model is a gauged linear sigma-model that has not only
the pion sector and the Wess-Zumino-Witten action of the nonlinear sigma-model,
but also a quark-scalar sector. The nucleon structure that emerges is that the
nucleon has an outer cloud of quark-antiquark condensed ground state, an inner
core of topological baryonic charge probed by omega, and a still smaller
quark-bag containing massless valence quarks. Large |t| pp elastic scattering
is attributed to valence quark-quark elastic scattering, which is taken to be
due to the hard pomeron. The model is applied to predict pp elastic
differential cross section at LHC at c.m. energy 14 TeV and |t| = 0 - 10 GeV*2.
If our predicted differential cross section is quantitatively confirmed by
precise measurement at LHC by the TOTEM group, then it will indicate that
various novel ideas developed over the last four decades to describe the
nucleon combine and lead to a unique physical description of its structure.


title: Azimuthal Asymmetry of Direct Photons in High Energy Nuclear Collisions

abstract:
  We show that a sizeable azimuthal asymmetry, characterized by a coefficient
v_2, is to be expected for direct photons produced in non-central high energy
nuclear collisions. This signal is generated by photons radiated by jets
interacting with the surrounding hot plasma. The anisotropy is out of phase by
an angle $\pi/2$ with respect to that associated with the elliptic anisotropy
of hadrons, leading to negative values of v_2. Such an asymmetry, if observed,
could be a signature for the presence of a quark gluon plasma and would
establish the importance of jet-plasma interactions as a source of
electromagnetic radiation.


title:
New Test of Supernova Electron Neutrino Emission using Sudbury Neutrino
  Observatory Sensitivity to the Diffuse Supernova Neutrino Background

abstract:
  Supernovae are rare nearby, but they are not rare in the Universe, and all
past core-collapse supernovae contributed to the Diffuse Supernova Neutrino
Background (DSNB), for which the near-term detection prospects are very good.
The Super-Kamiokande limit on the DSNB electron {\it antineutrino} flux,
$\phi(E_\nu > 19.3 {\rm MeV}) < 1.2$ cm$^{-2}$ s$^{-1}$, is just above the
range of recent theoretical predictions based on the measured star formation
rate history. We show that the Sudbury Neutrino Observatory should be able to
test the corresponding DSNB electron {\it neutrino} flux with a sensitivity as
low as $\phi(22.5 < E_\nu < 32.5 {\rm MeV}) \simeq 6 $ cm$^{-2}$ s$^{-1}$,
improving the existing Mont Blanc limit by about three orders of magnitude.
While conventional supernova models predict comparable electron neutrino and
antineutrino fluxes, it is often considered that the first (and
forward-directed) SN 1987A event in the Kamiokande-II detector should be
attributed to electron-neutrino scattering with an electron, which would
require a substantially enhanced electron neutrino flux. We show that with the
required enhancements in either the burst or thermal phase $\nu_e$ fluxes, the
DSNB electron neutrino flux would generally be detectable in the Sudbury
Neutrino Observatory. A direct experimental test could then resolve one of the
enduring mysteries of SN 1987A: whether the first Kamiokande-II event reveals a
serious misunderstanding of supernova physics, or was simply an unlikely
statistical fluctuation. Thus the electron neutrino sensitivity of the Sudbury
Neutrino Observatory is an important complement to the electron antineutrino
sensitivity of Super-Kamiokande in the quest to understand the DSNB.


title: Factorization and Regularization by Dimensional Reduction

abstract:
  Since an old observation by Beenakker et al, the evaluation of QCD processes
in dimensional reduction has repeatedly led to terms that seem to violate the
QCD factorization theorem. We reconsider the example of the process gg->ttbar
and show that the factorization problem can be completely resolved. A natural
interpretation of the seemingly non-factorizing terms is found, and they are
rewritten in a systematic and factorized form. The key to the solution is that
the D- and (4-D)-dimensional parts of the 4-dimensional gluon have to be
regarded as independent partons.


title:
Constraints on Yukawa-Type Deviations from Newtonian Gravity at 20
  Microns

abstract:
  Recent theories of physics beyond the standard model have predicted
deviations from Newtonian gravity at short distances. In order to test these
theories, we have a built an apparatus that can measure attonewton-scale forces
between gold masses separated by distances on the order of 25 microns. A
micromachined silicon cantilever was used as the force sensor, and its
displacement was measured with a fiber interferometer. We have used our
measurements to set bounds on the magnitude alpha and length scale lambda of
Yukawa-type deviations from Newtonian gravity; our results presented here yield
the best experimental limit in the range of lambda=6--20 microns.