title:
SUSY Resonances from UHE neutralinos in Neutrino Telescopes and in the
  Sky

abstract:
  In the Top-down scenarios, the decay of super-heavy particles
(m~10^{12-16}GeV), situated in dark-matter halos not very far from our Galaxy,
can explain the ultra-high-energy (UHE) cosmic-ray spectrum beyond the
Griesen-Zatasepin-Kuzmin cut-off. In the MSSM, a major component of the UHE
cosmic-ray flux at PeV-EeV energies could be given by the lightest neutralino
\chi, that is the lightest stable supersymmetric particle. Then, the signal of
UHE \chi's on earth might emerge over the interactions of a comparable neutrino
component. We compute the event rates for the resonant production of "right"
selectrons and "right" squarks in mSUGRA, when UHE neutralinos of energy larger
than 10^5 GeV scatter off electrons and quarks in an earth-based detector like
IceCube. When the resonant channel dominates in the total \chi-e,\chi-q
scattering cross section, the only model parameters affecting the corresponding
visible signal rates turn out to be the physical masses of the resonant
right-scalar and of the lightest neutralino. We compare the expected number of
supersymmetric events with the rates corresponding to the expected Glashow W
resonance and to the continuum UHE \nu-N scattering for realistic power-law
spectra. We find that the event rate in the leptonic selectron channel is
particularly promising, and can reach a few tens for a one-year exposure in
IceCube. Finally, we note that UHE neutralinos at much higher energies (up to
hundreds ZeV) may produce sneutrino resonances by scattering off relic
neutrinos in the Local Group hot dark halo. The consequent \tilde{\nu}-burst
into hadronic final states could mimic Z-burst events, although with quite
smaller conversion efficiency.


title: Electroweak Fits and Constraints on the Higgs Mass

abstract:
  The current status of the quantities entering into the global electroweak
fits is reviewed, highlighting changes since Summer 2003. These data include
the precision electroweak properties of the Z and W bosons, the top-quark mass
and the value of the electromagnetic coupling constant, at the scale of the Z
boson mass. Using these Z and W (high Q^2) data, the value of the Higss mass is
extracted, within the context of the Standard Model (SM). The consistency of
the data, and the overall agreement with the SM, are discussed.


title: SuperWIMP Cosmology and Collider Physics

abstract:
  Dark matter may be composed of superWIMPs, superweakly-interacting massive
particles produced in the late decays of other particles. We focus here on the
well-motivated supersymmetric example of gravitino LSPs. Gravitino superWIMPs
share several virtues with the well-known case of neutralino dark matter: they
are present in the same supersymmetric frameworks (supergravity with R-parity
conservation) and naturally have the desired relic density. In contrast to
neutralinos, however, gravitino superWIMPs are impossible to detect by
conventional dark matter searches, may explain an existing discrepancy in Big
Bang nucleosynthesis, predict observable distortions in the cosmic microwave
background, and imply spectacular signals at future particle colliders.


title: Complete CKM quark mixing via dimensional deconstruction

abstract:
  It is shown that the deconstruction of $[SU(2)\times U(1)]^N$ into
$[SU(2)\times U(1)]$ is capable of providing all necessary ingredients to
completely impliment the complex CKM mixing of quark flavors. The hierarchical
structure of quark masses originates from the difference in the deconstructed
chiral zero-mode distribution in theory space, while the CP-violating phase
comes from the genuinely complex vacuum expectation value of link fields. The
mixing is constructed in a specific model to satisfy experimental bounds on
quarks' masses and CP violation.


title:
Autocorrelations from the scale dependence of transverse-momentum
  fluctuations in Hijing-simulated Au-Au collisions at $\sqrt{s_{NN}} = $ 200
  GeV

abstract:
  We present measurements of the scale (bin-size) dependence of event-wise mean
transverse momentum $<p_{t}>$ fluctuations for Au-Au collisions at
$\sqrt{s_{NN}} = 200$ GeV simulated with the Hijing-1.37 Monte Carlo. We invert
those scale distributions to obtain autocorrelation distributions on
pseudorapidity $\eta$ and azimuth $\phi$ difference variables
$(\eta_\Delta,\phi_\Delta)$. The autocorrelations have a simple structure
dominated by a same-side (on azimuth) peak with similar widths on the two
difference variables. With jet quenching imposed, the same-side peak widths
increase slightly in both directions, and the amplitude is substantially
reduced. The same-side peaks are attributed to minijets, observed in this study
as local {\em velocity} correlations of charged particles with $p_t < $ 2
GeV/c.


abstract:
  We discuss B-meson signatures of a Supersymmetric U(2) flavor model, with
relatively light (electroweak scale masses) third generation right-handed
scalars. We impose current B and K meson experimental constraints on such a
theory, and obtain expectations for B->X_s gamma, B->X_s glue, B->X_s l+ l-,
B->phi K_s, B_s-B_sbar mixing, and the dilepton asymmetry in B_s. We show that
such a theory is compatible with all current data, and furthermore, could
reconcile the apparent deviations from Standard Model predictions that have
been found in some experiments.


title: Autocorrelations from fluctuation scale dependence by inversion

abstract:
  Fluctuations in nuclear collisions can be measured as a function of
momentum-space binning scale over a scale interval bounded by detector
two-track resolution and acceptance. Fluctuation scale dependence is related to
two-particle correlations by a Fredholm integral equation. That equation can be
inverted by standard numerical methods to yield an autocorrelation distribution
on difference variables as a projection of the full two-particle distribution
which retains most of the correlation information in a more compact form.
Autocorrelation distributions are typically more easily interpreted in terms of
physical mechanisms than fluctuation measurements.


title: Towards Resolution of Hierarchy Problems in a Cosmological Context

abstract:
  A cosmological scenario is proposed, which simultaneously solves the mass
hierarchy and the small dark energy problem. In the present scenario an
effective gravity mass scale (inverse of the Newton's constant) increases
during the inflationary period. The small cosmological constant or the dark
energy density in the present universe is dynamically realized by introducing
two, approximately O(2) symmetric dilatons, taking the fundamental mass scale
at TeV.


title:
$\sigma_{DIS}(\nu N)$, NLO Perturbative QCD and O(1 GeV) Mass
  Corrections

abstract:
  The deep-inelastic neutrino-nucleon cross section is one of the components of
few GeV neutrino interactions. We present here our results for
neutrino-isoscalar nucleon charged current scattering including perturbative
next-to-leading order QCD corrections, target mass corrections, charm mass and
lepton mass corrections.


title: Clan structure analysis and new physics signals in pp collisions at LHC

abstract:
  The study of possible new physics signals in global event properties in pp
collisions in full phase space and in rapidity intervals accessible at LHC is
presented. The main characteristic is the presence of an elbow structure in
final charged particle MD's in addition to the shoulder observed at lower c.m.
energies.


title:
Scenarios for multiplicity distributions in pp collisions in the TeV
  energy region

abstract:
  Possible scenarios based on available experimental data and phenomenological
knowledge of the GeV energy region are extended to the TeV energy region in the
framework of the weighted superposition mechanism of soft and semi-hard events.
KNO scaling violations, forward-backward multiplicity correlations, Hq vs. q
oscillations and shoulder structures are discussed.


title:
A lattice determination of moments of unpolarised nucleon structure
  functions using improved Wilson fermions

abstract:
  Within the framework of quenched lattice QCD and using O(a) improved Wilson
fermions and non-perturbative renormalisation, a high statistics computation of
low moments of the unpolarised nucleon structure functions is given. Particular
attention is paid to the chiral and continuum extrapolations.


title:
Small-x Behaviour of Lightcone Wavefunctions in Transverse Lattice Gauge
  Theory

abstract:
  We study the behaviour of lightcone wavefunctions, in coarse transverse
lattice gauge theory, when one or more parton lightcone momenta are small. This
probes the limit of hadron structure at large and small Bjorken x.
Finite-energy boundary conditions on boundstates allow one to derive the
analytic form of wavefunctions in this region. This leads to simple, universal
predictions for the behaviour of quark generalised parton distributions near
their endpoints. For the first few meson wavefunctions at large N_c, we give
the simplest ansatz that incorporates all the boundary conditions.


title: Challenges in calculations for multi-particle processes

abstract:
  The physics of high-energy collider experiments asks for delicate comparisons
between theoretical predictions and experimental data. Signals and potential
backgrounds for new physics have to be predicted at sufficient accuracy. The
accuracy as well as the computational complexity of the calculations leading to
the predictions depend on both the number of external particles in the process
analyzed and the order of the quantum corrections, the number of loops,
included in the calculation. We present some approaches to problems occurring
in these calculations regarding the integration of phase-space and the
inclusion of one-loop corrections.


title: Searching for Extra Dimensions in High Energy Cosmic Rays

abstract:
  We present a study of the decay of an intermediate mini black hole at the
first impact of a cosmic ray particle with the atmosphere, in the context of
D-brane world scenarios with TeV scale gravity and large extra dimensions. We
model the decay of the black hole using the semiclassical approximation and
include the corrections coming from energy loss into the bulk. Extensive
simulations show that mini black hole events are characterized by essentially
different multiplicities and wider lateral distributions of the air showers as
a function of the energy of the incoming primary, as compared to standard
events. Implications for their detection and some open issues on their possible
discovery are also briefly addressed.


title:
Helicity-dependent generalized parton distributions and composite
  constituent quarks

abstract:
  An approach, recently proposed to calculate the nucleon generalized parton
distributions (GPDs) in a constituent quark model (CQM) scenario, in which the
constituent quarks are taken as complex systems, is used to obtain
helicity-dependent GPDs. They are obtained from the wave functions of the non
relativistic CQM of Isgur and Karl, convoluted with the helicity-dependent GPDs
of the constituent quarks themselves. The latter are modelled by using the
polarized structure functions of the constituent quark, the double distribution
representation of GPDs, and a phenomenological constituent quark form factor.
The present approach permits to access a kinematical range corresponding to
both the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi and the
Efremov-Radyushkin-Brodsky-Lepage regions, for small values of the momentum
transfer and of the skewedness parameter. In this kinematical region, the
present calculation represents a prerequisite for the evaluation of cross
sections relevant to deeply virtual Compton scattering. In particular, we have
calculated the leading twist helicity-dependent GPD \tilde H and, from our
expressions, its general relations with the non relativistic definition of the
axial form factor and with the leading twist polarized quark density are
consistently recovered.


title: Search for New Physics at a Super-B Factory

abstract:
  The importance of a Super-B Factory in the search for New Physics, in
particular, due to CP-od phase(s) from physics beyond the Standard Model is
surveyed. The first point to emphasize is that we know now how to directly
measure all three angles of the unitarity triangle very cleanly, {\it i.e.
without theoretical assumptions} with {\it irreducible theory error $ \lsim
1%$}; however this requires much more luminosity than is currently available at
B-factories. Direct searches via penguin-dominated hadronic modes as well as
radiative, pair-leptonic and semi-leptonic decays are also discussed. {\bf Null
tests of the SM} are stressed as these will play a crucial role especially if
the effects of BSM phase(s) on B-physics are small.


title: Dynamical Gauge-Higgs Unification in the Electroweak Theory

abstract:
  $SU(2)_L$ doublet Higgs fields are unified with gauge fields in the $U(3)_s
\times U(3)_w$ model of Antoniadis, Benakli and Quir\'{o}s' on the orbifold
$M^4 \times (T^2/Z_2)$. The effective potential for the Higgs fields (the
Wilson line phases) is evaluated. The electroweak symmetry is dynamically
broken to $U(1)_{EM}$ by the Hosotani mechanism. There appear light Higgs
particles. There is a phase transition as the moduli parameter of the complex
structure of $T^2$ is varied.


title: Restoration of chiral symmetry in excited hadrons

abstract:
  Physics of the low-lying and high-lying hadrons in the light flavor sector is
reviewed. While the low-lying hadrons are strongly affected by the spontaneous
breaking of chiral symmetry, in the high-lying hadrons the chiral symmetry is
restored. A manifestation of the chiral symmetry restoration in excited hadrons
is a persistence of the chiral multiplet structure in both baryon and meson
spectra. Meson and baryon chiral multiplets are classified. A relation between
the chiral symmetry restoration and the string picture of excited hadrons is
discussed.

categories: hep-ph hep-ex hep-lat hep-th nucl-ex nucl-th


title: Some Results in M-Theory Inspired Phenomenology

abstract:
  We consider string phenomenological models based on 11D Horava-Witten
M-theory with 5 branes in the bulk. If the 5-branes cluster close to the
distant orbifold plane (d_n\equiv 1-z_n\simeq 0.1) and if the topological
charges of the physical plane vanish (\beta^{(0)}_i=0), then the Witten
\epsilon terms (to first order) are correctly small and a qualitative picture
of the quark and lepton mass hierarchy arises without significant fine tuning.
If right handed neutrinos exist, a possible gravitationally induced cubic
holomorphic contribution to the Kahler potential can exist scaled by the 11D
Planck mass. These terms give rise to Dirac neutrino masses at the electroweak
scale. This mechanism (different from the see-saw mechanism) is seen to account
for both the atmospheric and solar neutrino oscillations. The model also gives
rise to possible non-universal soft breaking A parameters in the u and d second
and third generation quark sector (A_{2,3}^{(u,d)}) which naturally can account
for the possible (2.4\sigma) break down of the Standard Model predictions in
the recent B-factory data for the B->\phi K_s decays.


title:
Disentangling perturbative and power corrections in precision tau decay
  analysis

abstract:
  Hadronic tau decay precision data are analyzed with account of both
perturbative and power corrections of high orders within QCD. It is found that
contributions of high order power corrections are essential for extracting a
numerical value for the strange quark mass from the data on Cabibbo suppressed
tau decays. We show that with inclusion of new five-loop perturbative
corrections in the analysis the convergence of perturbation theory remains
acceptable only for few low order moments. We obtain m_s(M_\tau) =130\pm 27 MeV
in agreement with previous estimates.


title: Investigation of Top quark spin correlations at hadron collider

abstract:
  We report on our results about hadronic $t\bar t$ production at NLO QCD
including $t, \bar t$ spin effects, especially on $t\bar t$ spin correlations.


title: How Long Could We Live?

abstract:
  We investigate model independent upper bounds on total proton lifetime in the
context of Grand Unified Theories with the Standard Model matter content. We
find them to be $\tau_p \leq 1.5^{+0.5}_{-0.3} \times 10^{39} \
\frac{(M_X/10^{16} \textrm{GeV})^4}{\alpha_{GUT}^2} (0.003 \textrm{GeV}^3 /
\alpha)^2 \textrm{years}$ and $\tau_p \leq 7.1^{+0.0}_{-0.0} \times 10^{36} \
\frac{(M_X/10^{16} \textrm{GeV})^4}{\alpha_{GUT}^2} (0.003 \textrm{GeV}^3 /
\alpha)^2 \textrm{years}$ in the Majorana and Dirac neutrino case,
respectively. These bounds, in conjunction with experimental limits, put lower
limit on the mass $M_X$ of gauge bosons responsible for the proton and
bound-neutron decay processes. For central values of relevant input parameters
we obtain $M_X \geq 4.3 \times 10^{14} \sqrt{\alpha_{GUT}} \textrm{GeV}$. Our
result implies that a large class of non-supersymmetric Grand Unified models,
with typical values $\alpha_{GUT} \sim 1/39$, still satisfies experimental
constraints on proton lifetime. Our result is independent on any CP violating
phase and the only significant source of uncertainty is associated with
imprecise knowledge of $\alpha$--the nucleon decay matrix element.


title: Heavy quark photoproduction in proton-proton collisions

abstract:
  We calculate the photoproduction of heavy quarks in proton-proton collisions
at RHIC, Tevatron and LHC energies. The integrated cross section and the
rapidity distributions for open charm and bottom production are computed
employing sound high energy QCD formalisms. For the linear pQCD approaches we
consider both the usual collinear factorization and the k_T-factorization
formalisms, whereas for the nonlinear QCD (saturation) calculations one
considers the Golec-Biernat-Wuesthoff and the Iancu-Itakura-Munier
parameterizations for the dipole cross section within the color dipole picture.


title:
Tying in CP and Flavor Violations with Fermion Masses and Neutrino
  Oscillations

abstract:
  In this paper we explore the possibility that (a) fermion masses, (b)
neutrino oscillations, (c) CP non-conservation and (d) flavor violations get
intimately linked to each other within supersymmetric grand unification based
on SO(10) or an effective G(224) = SU(2)_L\times SU(2)_R\times SU(4)^c
symmetry. We extend the framework proposed previously by Babu, Pati and Wilczek
(BPW) which successfully described fermion masses and neutrino oscillations, to
include CP violation. Assuming flavor universal SUSY breaking parameters at M^*
>~ M_{GUT}, and that CP violation arises through phases in the fermion mass
matrices, we show how the presence of GUT threshold induces new and calculable
CP and flavor violations. Including SM and SUSY contributions, we find that the
BPW framework can correctly account for the observed flavor and/or CP
violations in \Delta m_K, \Delta m_{B_d}, S(B_d-> J/\psi K_S) and \epsilon_K.
While SUSY-contribution is small (<~ few%) for the first three quantities, that
to \epsilon_K is sizable (~ 20-25%) and negative (as desired) compared to that
of the SM. The model predicts S(B_d-> \phi K_S) to be in the range
+(0.65-0.73), close to the SM prediction. The model yields
Re(\epsilon'/\epsilon)_{SUSY}\approx +(4-14)\times 10^{-4}; the relevance of
this contribution can be assessed only when the associated matrix elements are
known reliably. The model also predicts that the electric dipole moments of the
neutron and the electron should be discovered with improvements in current
limits by factors of 10 to 100.


title:
Phenomenology of Not-so-heavy Neutral Leptons: The NuTeV Anomaly, Lepton
  Universality, and Non-Universal Neutrino-Gauge Couplings

abstract:
  Talk presented by Takeuchi at the YITP workshop "Progress in Particle
Physics" 2004.


title:
Main results of a search on multiplicity distributions in pp collisions:
  is anybody afraid of a new class of hard events?

abstract:
  After an introduction on possible scenarios in the TeV energy region in pp
collisions, extrapolated from the knowledge of the GeV energy region, attention
is focused on the onset of a third class of events, harder than the semi-hard
and soft ones identified at SpS and Tevatron. The expected features and
signatures in multiplicity fluctuations, forward-backward correlations and
collision energy density are discussed.


title: The Intense Radiation Gas

abstract:
  We present a new dispersion relation for photons that are nonlinearly
interacting with a radiation gas of arbitrary intensity due to photon-photon
scattering. It is found that the photon phase velocity decreases with
increasing radiation intensity, it and attains a minimum value in the limit of
super-intense fields. By using Hamilton's ray equations, a self-consistent
kinetic theory for interacting photons is formulated. The interaction between
an electromagnetic pulse and the radiation gas is shown to produce pulse
self-compression and nonlinear saturation. Implications of our new results are
discussed.


title:
Heavy Quarkonium \pi^+\pi^- Transitions and a Possible b\bar{b}q\bar{q}
  State

abstract:
  $\pi^+\pi^-$ transitions of heavy quarkonia, especially the $
\Upsilon(3S)\to\Upsilon(1S)\pi^+\pi^-$ decay process, are revisited. In the
framework of the Chiral Unitary Theory (ChUT), the $S$ wave $\pi\pi$ final
state interaction (FSI) is included. It is found that when an additional
intermediate state with $J^P=1^+$ and I=1 is introduced, not only the $ \pi\pi$
invariant mass spectrum and the $cos\theta_\pi^*$ distribution in the
$\Upsilon(3S)\to\Upsilon(1S)\pi^+\pi^-$ process can simultaneously be
well-explained, but also a consistent description for other bottomonia $
\pi^+\pi^-$ transitions can be obtained. As a consequence, the mass and the
width of the intermediate state are predicted. From the quark content analysis,
this state should be a $b\bar bq\bar q$ state.


title:
Perturbative Heavy Quark Fragmentation Function through O(\alpha_s^2):
  Gluon Initiated Contribution

abstract:
  We derive the gluon initiated contribution to the initial condition for the
perturbative fragmentation function of a heavy quark through order
O(\alpha_s^2) in the MS-bar scheme. This result is needed for the resummation
with next-to-next-to-leading logarithmic accuracy of quasi-collinear logarithms
ln^k(m^2) in heavy quark differential distributions by solving the complete
DGLAP equation. Together with the previously evaluated fermion initiated
components, this result completes the derivation of the initial condition for
the perturbative fragmentation function at next-to-next-to-leading order.


title: Indirect Detection of Dark Matter WIMPs in a Liquid Argon TPC

abstract:
  We assess the prospects for indirect detection of Weakly Interacting Massive
Particles using a large Liquid Argon TPC detector. Signal events will consist
of energetic electron (anti)neutrinos coming from the decay of $\tau$ leptons
and $b$ quarks produced in WIMP annihilation in the core of the Sun. Background
contamination from atmospheric neutrinos is expected to be low, thanks to the
superb angular resolution and particle identification capabilities provided by
the considered experimental set-up. We evaluate the event rates predicted for
an annihilating WIMP as a function of its elastic scattering cross section with
nucleons. This technique is particularly useful for WIMPs lighter than
$\sim100$ GeV


title: Value of color charges and structure of gauge bosons

abstract:
  The values of color and anticolor charges are proposed. The structure of
gluons is predicted relative to their color and anticolor charges. It is shown
that the gauge bosons of lower order theories can be used as it is for higher
order theories. Various mass relations between the gauge bosons are also given.


title: Gauge boson couplings at LEP

abstract:
  A review is given of the measurements of triple and quartic couplings among
the electroweak gauge bosons performed at LEP by the four experiments ALEPH,
DELPHI, L3 and OPAL. Emphasis is placed on recently published results and on
combinations of results performed by the LEP electroweak gauge-couplings group.
All measurements presented are consistent with the Standard Model expectations.


title:
Higgs boson decays into charginos and neutralinos including full
  one-loop corrections

abstract:
  We present the one-loop corrected decay widths of a neutral (charged) Higgs
boson into a chargino or neutralino pair (chargino and neutralino) in the
CP-conserving MSSM. The chargino and neutralino parameters are renormalized in
the on-shell scheme and it is shown that the correction due to the
chargino/neutralino mass matrix renormalization is comparable to the
conventional vertex correction. The full corrections are typically of the order
of 10%.


title: Analytical Calculation of Two-Loop Feynman Diagrams

abstract:
  We review the Laporta algorithm for the reduction of scalar integrals to the
master integrals and the differential equations technique for their evaluation.
We discuss the use of the basis of harmonic polylogarithms for the analytical
expression of the results and some generalization of this basis to wider sets
of transcendental functions.


title: Orthopositronium Decay Spectrum using NRQED

abstract:
  As noticed in Ref.[1], the Ore-Powell's classical calculation of the o-Ps ->
3 gamma decay amplitude does not fulfill Low's theorem requirements for the low
energy end of the photon spectrum. We reanalyze the implications of Low's
theorem applied to this decay considering the interplay between the soft photon
limit and the energy scales present in the e+e- system. For energetic photons,
the spectrum agrees with the Ore-Powell result, but deviates from it when the
photon energy is comparable to the positronium binding energy. In this region
it is found that bound states effects are essential to reach agreement with
Low's theorem and can be accounted for in the framework of non-relativistic
QED.


title:
CP violating effects in the decay Z -> mu^+mu^-gamma induced by ZZgamma
  and Zgammagamma couplings

abstract:
  We analyze possible CP-violating effects induced in the $Z$ decay with hard
photon radiation by $\gamma ZZ$ and $\gamma\gamma Z$ anomalous vertices. We
estimate the sensibility of future linear collider experiments on these
couplings coming from CP-odd asymmetries associated to angular correlations of
the three particle final state in $e^+e^- \to Z \to \mu^+\mu^-\gamma$. We find
that a linear collider with an integrated luminosity of 500 $fb^{-1}$ and
$\sqrt{s} = 0.05$ TeV can place the bound $|h_1^{\gamma,Z}| < 0.92$ at the 90%
confidence level for these couplings.


title:
Charge asymmetry in $\bm{\gamma\gamma \to \mu^+\mu^- + neutrinos}$ with
  polarized photons

abstract:
  The difference in distributions of $\mu^+$ and $\mu^-$ in reactions $\gamma
\gamma \to \mu^+\mu^-+\nu\bar\nu$ and $\gamma \gamma \to W^\pm\mu^\mp
+\nu(\bar\nu)$ with polarized photons at $\sqrt{s}>200$ GeV is a large
observable effect which is sensitive to New Physics phenomena.


title:
The $\bm{e^- e^-}$ mode of LC: opportunities to discover loop-level
  lepton flavor (number) violation

abstract:
  The $e^- e^-$ mode with lepton number $L=+2$ of the initial state is
particularly suitable for studying lepton and flavor number violating reactions
(LFV). In this brief report we give a summary of the study of two loop-level
reactions which violate lepton and flavor numbers: we first consider seesaw
type models with heavy Majorana neutrinos at the TeV scale and study the
reactions $e^{-}e^{-} \to \ell^{-}\ell^{-}$, and then similar reactions
$e^{-}e^{-} \to \ell^{-}e^{-}$ ($\ell=\mu,\tau$) in supersymmetric models where
LFV is due to slepton mixing.


title: Epsilon'/Epsilon in the Standard Model: Theoretical Update

abstract:
  A complete analysis of isospin breaking in K to 2 pion amplitudes, including
both strong and electromagnetic corrections at next-to-leading order in chiral
perturbation theory, has been achieved recently.We discuss the implication of
these effects, together with the previously known chiral loop corrections, on
the direct CP-violating ratio epsilon'/epsilon. One finds Re(epsilon'/epsilon)
= (19^{+11}_{-9}) 10^{-4}.


title:
Three-Loop Electroweak Correction to the Rho Parameter in the Large
  Higgs Mass Limit

abstract:
  We present an analytical calculation of the leading three-loop radiative
correction to the rho-parameter in the Standard Model in the large Higgs mass
limit. This correction, of order g^6 m_H^4/M_W^4, is opposite in sign to the
leading two-loop correction of order g^4 m_H^2/M_W^2. The two corrections
cancel each other for a Higgs mass of approximately 480 GeV. The result shows
that it is extremely unlikely that a strongly interacting Higgs sector could
fit the data of electroweak precision measurements.


title: History and new ideas for exotic particles

abstract:
  Basic 1966 physics of Sakharov, Zeldovich and Nambu updated by QCD with
constituent-quark quasiparticles having effective masses fits all masses and
magnetic moments of ground state meson and baryons having no more than one
strange or heavy quark Flavor antisymmetry explains absence of low-lying
exotics and suggests diquark-triquark model and two-state model for $\Theta^+$
pentaquark. Variational approach gives mass bounds for other pentaquarks.


title:
Coherent multiple scattering and dihadron correlations in heavy ion
  collisions

abstract:
  We present a systematic calculation of the coherent multiple parton
scattering with several nucleons in lepton-nucleus and hadron-nucleus
collisions. We show that in l+A reactions coherence leads to nuclear shadowing
in the structure functions and a modification of the QCD sum rules. In p+A
reactions we evaluate the nuclear suppression of single and double inclusive
hadron production at moderate transverse momenta. We demonstrate that both
spectra and dihadron correlations in p+A collisions at RHIC are sensitive
measures of such dynamical nuclear attenuation effects.


title: Fragmentation of Partons

abstract:
  The concept of parton fragmentation in QCD hard scattering phenomenology as
well as NLO pQCD analysis of fragmentation functions are outlined.
Hadroproduction of pions of a few GeV pT is discussed through the example of
recent measurements at \sqrt{S_{RHIC}}=200 GeV.


title: Bottonium mass - evaluation using renormalon cancellation

abstract:
  We present a method of calculating the bottonium mass M[Upsilon(1S)] = [2 mb
+ E(b barb)]. The binding energy is separated into the soft and ultrasoft
components E(b barb)=[E(s)+E(us)] by requiring the reproduction of the correct
residue parameter value of the renormalon singularity for the renormalon
cancellation in the sum [2 mb + E(s)]. The Borel resummation is then performed
separately for (2 mb) and E(s), using the infrared safe MSbar mass [bar mb] as
input. E(us) is estimated. Comparing the result with the measured value of
M[Upsilon(1S)], the extracted value of the quark mass is [bar mb](mu=[bar mb])
= 4.241 +- 0.068 GeV (for the central value alphas(MZ)=0.1180). This value of
[bar mb] is close to the earlier values obtained from the QCD spectral sum
rules, but lower than from pQCD evaluations without the renormalon structure
for heavy quarkonia.


title:
Narrow Pentaquark States in a Quark Model with Antisymmetrized Molecular
  Dynamics

abstract:
  The exotic baryon $\Theta^+(uudd\bar{s})$ is studied with microscopic
calculations in a quark model by using a method of antisymmetrized molecular
dynamics(AMD). We predict narrow states, $J^\pi=1/2^+(I=0)$,
$J^\pi=3/2^+(I=0)$, and $J^\pi=3/2^-(I=1)$, which nearly degenerate in a
low-energy region of the $uudd\bar{s}$ system. We discuss $NK$ decay widths and
estimate them to be $\Gamma< 7$ for the $J^\pi=\{1/2^+,3/2^+\}$, and $\Gamma<1$
MeV for the $J^\pi=3/2^-$ state.


title: Lattice-QCD based Schwinger-Dyson approach for Chiral Phase Transition

abstract:
  Dynamical chiral-symmetry breaking in QCD is studied with the Schwinger-Dyson
(SD) formalism based on lattice QCD data, i.e., LQCD-based SD formalism. We
extract the SD kernel function $K(p^2)$ in an Ansatz-independent manner from
the lattice data of the quark propagator in the Landau gauge. As remarkable
features, we find infrared vanishing and intermediate enhancement of the SD
kernel function $K(p^2)$. We apply the LQCD-based SD equation to thermal QCD
with the quark chemical potential $\mu_q$. We find chiral symmetry restoration
at $T_c \simeq 100{\rm MeV}$ for $\mu_q=0$. The real part of the quark mass
function decreases as $T$ and $\mu_q$. At finite density, there appears the
imaginary part of the quark mass function, which would lead to the width
broadening of hadrons.


title: Searching for new physics at future accelerators

abstract:
  I overview the status of the Electroweak Symmetry Breaking problem, paying
special attention to the possible signals of new physics at the Large Hadron
Collider (and at a Linear Collider)


title: Coloured s-wave quark clusters with flavour symmetry breaking

abstract:
  We study the properties of coloured three particle s-wave quark clusters when
flavour symmetry is broken. The relevance of such clusters for models of
pentaquarks is shortly mentioned.


title: Pentaquark Baryons in String Theory -- Talk at Pentaquark 04

abstract:
  Pentaquark baryons $\Theta^{+}$ and $\Xi^{--}$ are studied in the dual
gravity theory of QCD in which simple mass formulae of pentaquarks are derived
in the Maldacena prototype model for supersymmetric QCD and a more realistic
model for ordinary QCD. In this approach it is possible to explain the
extremely narrow decay widths of pentaquarks. With the aim of constructing more
reliable mass formulae, a sketch is given on spin and the hyperfine interaction
in the string picture.


title: Tadpoles and Symmetries in Higgs-Gauge Unification Theories

abstract:
  In theories with extra dimensions the Standard Model Higgs fields can be
identified with internal components of bulk gauge fields (Higgs-gauge
unification). The bulk gauge symmetry protects the Higgs mass from quadratic
divergences, but at the fixed points localized tadpoles can be radiatively
generated if U(1) subgroups are conserved, making the Higgs mass UV sensitive.
We show that a global symmetry, remnant of the internal rotation group after
orbifold projection, can prevent the generation of such tadpoles. In particular
we consider the classes of orbifold compactifications T^d/Z_N (d even, N>2) and
T^d/Z_2 (arbitrary d) and show that in the first case tadpoles are always
allowed, while in the second they can appear only for d=2 (six dimensions).


title:
The Higgs and Neutralino Sectors of the Next-to-Minimal Supersymmetric
  Standard Model

abstract:
  The Next-to-Minimal Supersymmetric Standard Model (NMSSM) includes a Higgs
iso-singlet superfield in addition to the two Higgs doublet superfields of the
minimal supersymmetric extension. The Higgs sector and neutralino sectors of
this model are examined within the context of a future linear collider.


title: QCD radiative and power corrections and Generalized GDH sum rules

abstract:
  We extend the earlier suggested QCD-motivated model for the $Q^2$-dependence
of the generalized Gerasimov-Drell-Hearn (GDH) sum rule which assumes the
smooth dependence of the structure function $g_T$, while the sharp dependence
is due to the $g_2$ contribution and is described by the elastic part of the
Burkhardt-Cottingham sum rule. The model successfully predicts the low crossing
point for the proton GDH integral, but is at variance with the recent very
accurate JLAB data. We show that, at this level of accuracy, one should include
the previously neglected radiative and power QCD corrections, as boundary
values for the model. We stress that the GDH integral, when measured with such
a high accuracy achieved by the recent JLAB data, is very sensitive to QCD
power corrections. We estimate the value of these power corrections from the
JLAB data at $Q^2 \sim 1 {GeV}^2$. The inclusion of all QCD corrections leads
to a good description of proton, neutron and deuteron data at all $Q^2$.


title: Physics prospects of future neutrino oscillation experiments in Asia

abstract:
  The three neutrino model has 9 physical parameters, 3 neutrino masses, 3
mixing angles and 3 CP violating phases. Among them, neutrino oscillation
experiments can probe 6 parameters: 2 mass squared differences, 3 mixing
angles, and 1 CP phase. The experiments performed so far determined the
magnitudes of the two mass squared differences, the sign of the smaller mass
squared difference, the magnitudes of two of the three mixing angles, and the
upper bound on the third mixing angle. The sign of the larger mass squared
difference (the neutrino mass hierarchy pattern), the magnitude of the third
mixing angle and the CP violating phase, and a two-fold ambiguity in the mixing
angle that dictates the atmospheric neutrino oscillation should be determined
by future oscillation experiments. In this talk, I introduce a few ideas of
future long baseline neutrino oscillation experiments which make use of the
super neutrino beams from J-PARC (Japan Proton Accelerator Research Complex) in
Tokai village. We examine the potential of HyperKamiokande (HK), the proposed 1
Mega-ton water Cerenkov detector, and then study the fate and possible
detection of the off-axis beam from J-PARC in Korea. We also show that very
long baseline experiments with higher energy beams from J-PARC and a water
Cerenkov calorimeter detector (BAND) proposed in Beijing can resolve the
neutrino mass hierarchy, and lift all the degeneracies in the three neutrino
model parameters.


title: Physical Gluons and High $E_T$ Jets

abstract:
  We propose a more physical parameterization of the gluon distribution for
global parton analyses of deep inelastic and related hard scattering data. In
the new parameterization the gluon distribution at large x in the MSbar-scheme
is driven by the valence quarks, which naturally produces a shoulder-like form
at high x, and hence produces a better description of the Tevatron inclusive
jet data. We perform the new analysis at both NLO and NNLO. The improvement is
found to be even better at NNLO than at NLO. We make available the new sets of
NLO and NNLO partons, which we denote by MRST2004.


title: Neutral Pion-like Resonances at Photon Colliders

abstract:
  Two photons can annihilate into a neutral pion-like resonance via the anomaly
coupling, just like $\pi^0\gamma\gamma$ in QCD. In some strongly interacting
electroweak symmetry breaking models, e.g., technicolor type models, there
often exist neutral pion-like resonances. TeV photon colliders have a strong
capability to discover such particles, because the standard model background in
photon scattering goes through box diagrams and is therefore highly suppressed.
In this study, we perform a signal-background comparison. We show that $e^+
e^-$ linear colliders running in $\gamma\gamma$ mode can discover such
neutral-pion-like resonances with a decent sensitivity.


title: Diffractive physics: from the Tevatron to the LHC

abstract:
  Measurements of soft and hard diffractive processes have been performed at
the Tevatron p-pbar collider during the past decade. Diffractive events are
studied by means of identification of one or more rapidity gaps and/or a
leading antiproton. Here, results are discussed within the Tevatron data and
compared to those obtained at the HERA ep collider. The traditional ``pomeron''
is described within the framework of QCD and the issues discussed include
pomeron structure, diffractive cross section factorization, and universality of
rapidity gap formation. Exclusive dijet and low-mass state production in
double-pomeron exchange processes, including predictions for Higgs production
at the LHC from dijet measurements at the Tevatron.


title: The role of strange sea quarks in chiral extrapolations on the lattice

abstract:
  Since the strange quark has a light mass of order Lambda_QCD, fluctuations of
sea s-s bar pairs may play a special role in the low-energy dynamics of QCD by
inducing significantly different patterns of chiral symmetry breaking in the
chiral limits N_f=2 (m_u=m_d=0, m_s physical) and N_f=3 (m_u=m_d=m_s=0). This
effect of vacuum fluctuations of s-s bar pairs is related to the violation of
the Zweig rule in the scalar sector, described through the two O(p^4)
low-energy constants L_4 and L_6 of the three-flavour strong chiral lagrangian.
In the case of significant vacuum fluctuations, three-flavour chiral expansions
might exhibit a numerical competition between leading- and
next-to-leading-order terms according to the chiral counting, and chiral
extrapolations should be handled with a special care. We investigate the impact
of the fluctuations of s-s bar pairs on chiral extrapolations in the case of
lattice simulations with three dynamical flavours in the isospin limit.
Information on the size of the vacuum fluctuations can be obtained from the
dependence of the masses and decay constants of pions and kaons on the light
quark masses. Even in the case of large fluctuations, corrections due to the
finite size of spatial dimensions can be kept under control for large enough
boxes (L around 2.5 fm).


title:
Contribution of Instanton Induced Interaction for Penta-quarks in MIT
  Bag Model

abstract:
  Roles of instanton induced interactions (III) in the masses of pentaquark
baryons, Theta^+ (J=1/2 and 3/2) and Xi^{--}, and a dibaryon, H, are discussed
using the MIT bag model. It is shown that the two-body terms in III give a
strong attraction mainly due to the increase of the number of pairs in
multi-quark systems. In contrast, the three-body $u$-$d$-$s$ interaction is
repulsive. It is found that III lowers the mass of negative-parity Theta^+ as
much as 100 MeV from the mass predicted by the bag model without III.


title: QCD Green functions in a gluon field

abstract:
  We formulate a dressed perturbative expansion of QCD, where the standard
diagrams are evaluated in the presence of a constant external gluon field whose
magnitude is gaussian distributed. The approach is Poincar{\'e} and gauge
invariant, and modifies the usual results for hard processes only by power
suppressed contributions. Long distance propagation of quarks and gluons turns
out to be inhibited due to a branch point singularity instead of a pole at
$p^2=0$ in the quark and gluon propagators. The dressing keeps the (massless)
quarks in q qbar fluctuations of the photon at a finite distance from each
other.


title: Quark-Hadron Critical Point consistent with Bootstrap and Lattice QCD

abstract:
  The critical sector of strong interactions at high temperatures is explored
in the frame of two complementary paradigms: Statistical Bootstrap for the
hadronic phase and Lattice QCD for the Quark-Gluon partition function. A region
of thermodynamic instability of hadronic matter was found, as a direct
prediction of Statistical Bootstrap. As a result, critical end point solutions
for nonzero chemical potential were traced in the phase diagram of strongly
interacting matter, consistently with chiral QCD and recent lattice
calculations. The relevance of these solutions for current and future
experiments with nuclei at high energies is also discussed.


title: Effects of CP phases on the Phenomenology of SUSY Particles

abstract:
  We review our recent studies on the effects of CP-violating supersymmetric
(SUSY) parameters on the phenomenology of neutralinos, charginos and third
generation squarks. The CP-even branching ratios of the squarks show a
pronounced dependence on the phases of A_t, A_b, mu and M_1 in a large region
of the supersymmetric parameter space, which can be used to get information on
these phases. In addition we have studied CP-odd observables, like asymmetries
based on triple product correlations. In neutralino and chargino production
with subsequent three-body decays these asymmetries can be as large as 20%.


title:
The Virtual Correction to Bremsstrahlung in High-Energy e+ e-
  Annihilation: Comparison of Exact Results

abstract:
  We have compared the virtual corrections to single hard bremsstrahlung as
calculated by S. Jadach, M. Melles, B.F.L. Ward and S.A. Yost to several other
expressions. The most recent of these comparisons is to the leptonic tensor
calculated by J.H. Kuhn and G. Rodrigo for radiative return. Agreement is found
to within a part in 10^5 or better, as a fraction of the Born cross section,
for most of the range of photon energies. The massless limits have been shown
to agree analytically to NLL order.


title: Gauge/String-Gravity Duality and Froissart Bound

abstract:
  The gauge/string-gravity duality correspondence opened renewed hope and
possibility to address some of the fundamental and non-perturbative QCD
problems in particle physics, such as hadron spectrum and Regge behavior of the
scattering amplitude at high energies. One of the most fundamental and
long-standing problem is the high energy behavior of total cross-sections.
According to a series of exhaustive tests by the COMPETE group, (1). total
cross-sections have a universal Heisenberg behavior in energy corresponding to
the maximal energy behavior allowed by the Froissart bound, i.e., $A + B ln^2
(s/s_0)$ with $B \sim 0.32 mb$ and $s_0 \sim 34.41 GeV^2$ for all reactions,
and (2). the factorization relation among $\sigma_{pp, even}, \sigma_{\gamma
p}, and \sigma_{\gamma \gamma}$ is well satisfied by experiments. I discuss the
recent interesting application of the gauge/string-gravity duality of $AdS/CFT$
correspondence with a deformed background metric so as to break the conformal
symmetry that can lead to the Heisenberg behavior of rising total
cross-sections, and present some preliminary results on the high energy QCD
from Planckian scattering in $AdS$ and black-hole production.


title:
Glue content and mixing angle of the eta - eta' system. The effect of
  the isoscalar 0- continuum

abstract:
  Masses and topological charges of the eta and eta' mesons are expressed in
terms of the singlet-octet mixing angle theta. Contributions of the
pseudoscalar 0- continuum are evaluated in a model independant way.
Applications to the decay eta --> 3pi and to the radiative decay of vector
mesons involving eta and eta' are considered. Agreement with experiment is in
general good and the results quite stable for -30.5 <= theta <= -18.5


title: Exotic Challenges

abstract:
  We list and discuss theoretical consequences of recent discovery of
$\Theta^+$.


title: Neutrino Mass from R-parity Violation in Split Supersymmetry

abstract:
  We investigate how the observed neutrino data can be accommodated by R-parity
violation in Split Supersymmetry. The atmospheric neutrino mass and mixing are
explained by the bilinear parameters $\xi_i$ inducing the neutrino-neutralino
mixing as in the usual low-energy supersymmetry. Among various one-loop
corrections, only the quark-squark exchanging diagrams involving the order-one
trilinear couplings $\lambda'_{i23,i32}$ can generate the solar neutrino mass
and mixing if the scalar mass $m_S$ is not larger than $10^9$ GeV. This scheme
requires an unpleasant hierarchical structure of the couplings, e.g.,
$\lambda_{i23,i32}\sim 1$, $\lambda'_{i33} \lesssim 10^{-4}$ and $\xi_i
\lesssim 10^{-6}$. On the other hand, the model has a distinct collider
signature of the lightest neutralino which can decay only to the final states,
$l_i W^{(*)}$ and $\nu Z^{(*)}$, arising from the bilinear mixing. Thus, the
measurement of the ratio; $\Gamma(e W^{(*)}) : \Gamma(\mu W^{(*)}) :
\Gamma(\tau W^{(*)})$ would provide a clean probe of the small reactor and
large atmospheric neutrino mixing angles as far as the neutralino mass is
larger than 62 GeV.


title:
A New Bound State $6t + 6\bar t$ and the Fundamental-Weak Scale
  Hierarchy in the Standard Model

abstract:
  The multiple point principle, according to which several vacuum states with
the same energy density exist, is put forward as a fine-tuning mechanism
predicting the exponentially huge ratio between the fundamental and weak scales
in the Standard Model (SM). Using renormalisation group equations for the SM,
we obtain the effective potential in the 2-loop approximation and investigate
the existence of its postulated second minimum at the fundamental scale. A
prediction is made of the existence of a new bound state of 6 top quarks and 6
anti-top quarks, formed due to Higgs boson exchanges between pairs of
quarks/anti-quarks. This bound state is supposed to condense in a new phase of
the SM vacuum. The existence of three vacuum states (new, weak and fundamental)
solves the hierarchy problem in the SM.


title: On Distinguishing Radions From Higgs Bosons

abstract:
  Radion couplings are almost identical to Higgs boson couplings, making it
very difficult to distinguish the two states when the radion mass and vacuum
expectation value are similar to those of the Higgs boson. The only real
difference lies in the fact that the coupling of radions to off-shell fermions
is proportional to the momentum rather than the mass of the fermion. This extra
contribution gets cancelled in all tree-level processes and shows up only in
loop-induced processes like Phi -> gamma gamma and Phi -> gg. We perform a
careful calculation of the branching ratios and establish that they can prove
crucial in clearly distinguishing a radion from a Higgs boson. This claim is
made concrete by evaluating the exclusive cross-sections in a radiative process
involving elementary scalars.


title: Pion form factor analysis using NLO analytic perturbation theory

abstract:
  I present results for the pion's electromagnetic form factor in the spacelike
region, which implement the most advanced perturbative information currently
available for this observable in conjunction with a pion distribution amplitude
that agrees with the CLEO data on the pion-photon transition form factor at the
$1\sigma$ level. I show that using for the running strong coupling and its
powers their analytic versions in the sense of Shirkov and Solovtsov, the
obtained predictions become insensitive to the renormalization scheme and scale
setting adopted. Joining the hard contribution with the soft part on account of
local duality and respecting the Ward identity at $Q^2=0$, the agreement with
the available experimental data, including expectations from planned
experiments at JLab, is remarkable both in trend and magnitude. I also comment
on Sudakov resummation within the analytic approach.


title: Electroweak Baryogenesis in the Next-to-MSSM

abstract:
  Next-to-MSSM is a viable model which is equipped with two features suited for
electroweak baryogensis (EWBG): first-order phase transition not restricted by
the Higgs spectrum and tree-level CP violation in the Higgs sector free from
the nEDM constraints. We study the model when the expectation value of the
singlet scalar is of the weak scale. Then the vacuum stability condition puts a
novel upper bound on the charged Higgs mass. We determined allowed parameter
region by requiring that the each Higgs boson is heavier than 114GeV or its
coupling to Z boson is smaller than 0.1.


title: Are black holes over-produced during preheating?

abstract:
  We provide a simple but robust argument that primordial black hole (PBH)
production generically does {\em not} exceed astrophysical bounds during the
resonant preheating phase after inflation. This conclusion is supported by
fully nonlinear lattice simulations of various models in two and three
dimensions which include rescattering but neglect metric perturbations. We
examine the degree to which preheating amplifies density perturbations at the
Hubble scale and show that at the end of the parametric resonance, power
spectra are universal, with no memory of the power spectrum at the end of
inflation. In addition we show how the probability distribution of density
perturbations changes from exponential on very small scales to Gaussian when
smoothed over the Hubble scale -- the crucial length for studies of primordial
black hole formation -- hence justifying the standard assumption of
Gaussianity.


title: Large 2HDM(II) one-loop corrections in leptonic tau decays

abstract:
  The one-loop contributions to the branching ratios for leptonic tau decays
are calculated in the CP conserving 2HDM(II). We found that these one-loop
contributions, involving both neutral and charged Higgs bosons, dominate over
the tree-level H^+ exchange, the latter one being totally negligible for the
decay into electron. The analysis is focused on large tanbeta enhanced
contributions to the considered branching ratios. We derive a simple analytical
expression for the one-loop contribution which holds in this case. We show that
the leptonic branching ratios of tau are complementary to the Higgsstrahlung
processes for h(H) and have a large potential on constraining parameters of the
model. In this work we provide upper limits on Yukawa couplings for both light
h and light A scenarios and we derive new lower limit on mass of M_{H^+} as a
function of tanbeta, which differs significantly from what was considered as
standard constraint based on the tree-level H^{+} exchange only. Interestingly
we obtain also an upper limit on M_{H^+}. For a SM-like h scenario, with heavy
and degenerate additional Higgs bosons, one-loop corrections disappear.


title:
Supersymmetry Tests from a Combined Analysis of Chargino, Neutralino,
  and Charged Higgs Boson Pair Production at a 1 TeV Linear Collider

abstract:
  We consider the production of chargino, neutralino and charged Higgs boson
pairs at future linear colliders for c. m. energies in the one TeV range within
the MSSM. We compute the leading (double) and next-to leading (linear)
supersymmetric logarithmic terms of the so-called "Sudakov expansion" at
one-loop level. We show that a combined analysis of the slopes of the chargino,
neutralino, and charged Higgs boson pair production cross sections would offer
a simple possibility for determining \tan\beta for large (\gsim 10) values, and
the parameters M_1, M_2, and \mu. This test could provide a strong consistency
check of the considered supersymmetric model.


title: Pion and kaon condensation in a 3-flavor NJL model

abstract:
  We analyze the phase diagram of a three-flavor Nambu-Jona-Lasinio model at
finite temperature $T$ and chemical potentials $\mu_u, \mu_d, \mu_s$. We study
the competition of pion and kaon condensation and we propose a physical
situation in which kaon condensation could be led only by light quark finite
densities.


title: Nucleon Form Factors from Generalized Parton Distributions

abstract:
  We discuss the links between Generalized Parton Distributions (GPDs) and
elastic nucleon form factors. These links, in the form of sum rules, represent
powerful constraints on parametrizations of GPDs. A Regge parametrization for
GPDs at small momentum transfer, is extended to the large momentum transfer
region and it is found to describe the basic features of proton and neutron
electromagnetic form factor data. This parametrization is used to estimate the
quark contribution to the nucleon spin.


title: Axion Models with High-Scale Supersymmetry Breaking

abstract:
  Inspired by the possibility of high-scale supersymmetry breaking in the
string landscape where the cosmological constant problem and the gauge
hierarchy problem can be solved while the strong CP problem is still a
challenge for naturalness, we propose a supersymmetric KSVZ axion model with an
approximate universal intermediate-scale ($\sim 10^{11}$ GeV) supersymmetry
breaking. To protect the global Peccei--Quinn (PQ) symmetry against quantum
gravitational violation, we consider the gauged discrete $Z_N$ PQ symmetry. In
our model the axion can be a cold dark matter candidate, and the intermediate
supersymmetry breaking scale is directly related to the PQ symmetry breaking
scale. Gauge coupling unification can be achieved at about $2.7\times 10^{16}$
GeV. The Higgs mass range is 130 GeV to 160 GeV. We briefly discuss other axion
models with high-scale supersymmetry breaking where the stabilization of the
axion solution is similar.


title:
Higher twists in spin structure functions from a "constituent quark"
  point of view

abstract:
  We discuss the implications of a "constituent quark" structure of the nucleon
for the leading (1/Q^2-) power corrections to the spin structure functions. Our
basic assumption is the presence of quark-gluon correlations in the nucleon
wave function, whose size, rho ~ 0.3 fm, is small compared to the nucleon
radius, R (two-scale picture). We argue that in this picture the isovector
twist-4 matrix element in the proton has a sizable negative value, M_N^2
|f_2^{u - d}| ~ rho^{-2}, while the twist-3 matrix elements are small, M_N^2
d_2 ~ R^{-2}. These findings are in agreement with the result of a QCD fit to
the g_1 world data, including recent neutron data from HERMES and Jefferson Lab
Hall A, which gives M_N^2 f_2^{u - d} = -0.28 +/- 0.08 GeV^2.


title: Neutrino mass constraints on beta decay

abstract:
  Using the general connection between the upper limit on the neutrino mass and
the upper limits on certain types of non-Standard Model interaction that can
generate loop corrections to the neutrino mass, we derive constraints on some
non-Standard Model $d\to ue^-\bar{\nu}$ interactions. When cast into limits on
$n\to pe^-\bar{\nu}$ coupling constants, our results yield constraints on
scalar and tensor weak interactions improved by more than an order of magnitude
over the current experimental limits. When combined with the existing limits,
our results yield $|C_S/C_V|\alt 5\times 10^{-3}$, $|C'_S/C_V|\alt 5\times
10^{-3}$, $|C_T/C_A| \alt 1.2\times 10^{-2}$ and $|C'_T/C_A| \alt 1.2\times
10^{-2}$.


title: rho^0 mass in a hot hadron gas

abstract:
  We study the behavior of the rho^0 vector mass during the hadronic phase of
an ultra-relativistic heavy-ion collision at finite temperature. We show that
scattering with the most abundant particles during this stage, namely, pions,
kaons and nucleons, leads to an overall temperature dependent, decrease of the
rho^0 intrinsic mass at rest, compared to its value in vacuum. The main
contributions arise from s-channel scattering with pions through the formation
of a_1 resonances as well as with nucleons through the formation of even
parity, spin 3/2 [N(1720)] and 5/2 [$\Delta$(1905)] nucleon resonances. We show
that it is possible to achieve a shift in the intrinsic rho^0 mass of order -
40 MeV, when including the contributions of all the relevant mesons and baryons
that take part in the scattering, for temperatures between chemical and kinetic
freeze-out.


title:
Physics beyond the Standard Model and its Minimal Supersymmetric
  extension at large colliders

abstract:
  New large colliders will probe scales up to few TeV, indicating the way
Nature has chosen to extend the Standard Model. We review alternative scenarios
to the traditional Minimal Supersymmetric Standard Model: the little Higgs
model, split supersymmetry and extra dimensional models with low energy
signals.


title:
The four-group Z_2 x Z_2 as a discrete invariance group of effective
  neutrino mass matrix

abstract:
  Two sets of four 3x3 matrices 1^(3), varphi_1, varphi_2, varphi_3 and 1^(3),
mu_1, mu_2, mu_3 are constructed, forming two unitarily isomorphic reducible
representations 3 of the group Z_2 x Z_2 called often the four-group. They are
related to each other through the effective neutrino mixing matrix U with
s_{13} = 0, and generate four discrete transformations of flavor and mass
active neutrinos, respectively. If and only if s_{13} = 0, the generic form of
effective neutrino mass matrix M becomes invariant under the subgroup Z_2 of
Z_2 x Z_2 represented by the matrices 1^(3) and varphi_3. In the approximation
of m_1 = m_2, the matrix M becomes invariant under the whole Z_2 x Z_2
represented by the matrices 1^(3), varphi_1, varphi_2, varphi_3. The effective
neutrino mixing matrix U with s_{13} = 0 is always invariant under the whole
Z_2 x Z_2 represented in two ways, by the matrices 1^(3), varphi_1, varphi_2,
varphi_3 and 1^(3), mu_1, mu_2, mu_3.


title: On the quark-gluon plasma search

abstract:
  We report on the effect of the quantum statistics on the two-proton spin
correlation (SC) in cold and thermal nuclear matter. We have found that two
nucleons SC function can be well approximated by a guassian with correlations
length $\sigma\sim1.2$ fm. We have proposed SC measurement on low protons
energy as test of the quark-gluon plasma formation in relativistic heavy ions
collisions.


title: Numerical evaluation of multiple polylogarithms

abstract:
  Multiple polylogarithms appear in analytic calculations of higher order
corrections in quantum field theory. In this article we study the numerical
evaluation of multiple polylogarithms. We provide algorithms, which allow the
evaluation for arbitrary complex arguments and without any restriction on the
weight. We have implemented these algorithms with arbitrary precision
arithmetic in C++ within the GiNaC framework.


title: Constraints on the parity-violating couplings of a new gauge boson

abstract:
  High-energy particle physics experiments allow for the possible existence of
a new light, very weakly coupled, neutral gauge boson (the U boson). This one
permits for light (spin-1/2 or spin-0) particles to be acceptable Dark Matter
candidates, by inducing sufficient (stronger than weak) annihilation cross
sections into e+e-. They could be responsible for the bright 511 keV gamma ray
line observed by INTEGRAL from the galactic bulge.
  Such a new interaction may have important consequences, especially at lower
energies. Parity-violation atomic-physics experiments provide strong
constraints on such a U boson, if its couplings to quarks and electrons violate
parity. With the constraints coming from an unobserved axionlike behaviour of
this particle, they privilegiate a pure vector coupling of the U boson to
quarks and leptons, unless the corresponding symmetry is broken sufficiently
above the electroweak scale.


title:
Is it still worth searching for lepton flavor violation in rare kaon
  decays?

abstract:
  Prospective searches for lepton flavor violation (LFV) in rare kaon decays at
the existing and future intermediate-energy accelerators are considered. The
proposed studies are complementary to LFV searches in muon-decay experiments
and offer a unique opportunity to probe models with approximately conserved
fermion-generation quantum number with sensitivity superior to that in other
processes. Consequently, new searches for LFV in kaon decays are an important
and independent part of the general program of searches for lepton flavor
violation in the final states with charged leptons.


title: Characteristics of the chiral phase transition in nonlocal quark models

abstract:
  The characteristics of the chiral phase transition are analyzed within the
framework of chiral quark models with nonlocal interactions in the mean field
approximation. In the chiral limit, we develop a semi-analytic framework which
allows us to explicitly determine the phase transition curve, the position of
the critical points, some relevant critical exponents, etc. For the case of
finite current quark masses, we show the behavior of various thermodynamical
and chiral response functions across the phase transition.


title:
Multiple exchanges in lepton pair production in high--energy heavy ion
  collisions

abstract:
  The recent analysis of nuclear distortions in DIS off nuclei revealed a
breaking of the conventional hard factorization for multijet observable. The
related pQCD analysis of distortion effects for jet production in
nucleus-nucleus collisions is as yet lacking. As a testing ground for such an
analysis we consider the Abelian problem of higher order Coulomb distortions of
the spectrum of lepton pairs produced in peripheral nuclear collisions. We
report an explicit calculation of the contribution to the lepton pair
production in the collision of two photons from one nucleus with two photons
from the other nucleus, $2\gamma + 2\gamma \to \m{l}^+\m{l}^-$. The dependence
of this amplitude on the transverse momenta has a highly nontrivial form the
origin of which can be traced to the mismatch of the conservation of the
Sudakov components for the momentum of leptons in the Coulomb field of the
oppositely moving nuclei.
  The result suggests that the familiar eikonalization of Coulomb distortions
breaks down for the oppositely moving Coulomb centers, which is bad news from
the point of view of extensions to the pQCD treatment of jet production in
nuclear collisions. On the other hand, we notice that the amplitude for the
$2\gamma + 2\gamma \to \m{l}^+\m{l}^-$ process has a logarithmic enhancement
for the lepton pairs with large transverse momentum, which is absent for
$n\gamma + m\gamma \to \m{l}^+\m{l}^-$ processes with $m,n > 2$.
  We discuss the general structure of multiple exchanges and show how to deal
with higher order terms which cannot be eikonalized.


title: Is X(3872) a possible candidate of hybrid meson

abstract:
  The associate productions of X(3872) and J/\psi in hadron collisions and
flavor independence of hadrons in ee^+\to X(3872)+hadrons and the decays
X(3872)\to \gamma+hadrons are discussed. It is pointed out X(3872)\to
J/\psi+\sigma could be a significant decay channel.


title: Wounded nucleon model and Deuteron-Gold collisions at RHIC

abstract:
  It is shown that the wounded nucleon model describes very well the recent
PHOBOS data on particle production in D-Au collisions at 200 GeV. Contribution
to particle production from a single wounded nucleon is determined. A
two-component model is formulated and shown to account for most of the
important features of the data.


title: Detecting matter effects in long baseline experiments

abstract:
  Experiments strongly suggest that the flavour mixing responsible for the
atmospheric neutrino anomaly is very close to being maximal. Thus, it is of
great theoretical as well as experimental importance to measure any possible
deviation from maximality. In this context, we reexamine the effects of matter
interactions in long baseline neutrino oscillation experiments. Contrary to
popular belief, the muon neutrino survival probability is shown to be quite
sensitive to matter effects. Moreover, for moderately long baselines, the
difference between the survival probilities for $\nu_\mu$ and $\bar\nu_\mu$ is
shown to be large and sensitive to the deviation of $|U_{\mu 3}|$ from
maximality. Performing a realistic analysis, we demonstrate that a muon-storage
ring $\nu$-source alongwith an iron calorimeter detector can measure such
deviations. (Contrary to recent claims, this is not so for the NuMI--{\sc
minos} experiment.) We also discuss the possible correlation in measuring
$U_{\mu 3}$ and $U_{e3}$ in such experiment.


title:
Prospects of a Search for Neutral, Long-Lived Particles using Photon
  Timing at CDF

abstract:
  We present the prospects of searches for neutral, long-lived particles which
decay to photons using their time of arrival measured with a newly installed
EMTiming system at CDF. Using GMSB $\tilde{\chi}_{1}^{0}\to\gamma\tilde{G}$
models we estimate the expected 95% confidence level exclusion regions as a
function of the neutralino mass and lifetime. We find that a combination of
single photon and diphoton analyses should allow the Tevatron in run II to
easily extend the exclusion regions from ALEPH at LEP II, and cover parts of
the theoretically favored $m_{\tilde{G}}$ < few keV/c^2 GMSB parameter space.


title:
Rare top quark and Higgs boson decays in Alternative Left-Right
  Symmetric Models

abstract:
  Top quark and Higgs boson decays induced by flavor-changing neutra currents
(FCNC) are very much suppressed in the Standard Model (SM). Their detection in
colliders like the Large Hadron Collider (LHC), Next Linear Collider (NLC) or
Tevatron would be a signal of new physics. We evaluate the FCNC decays t \to
H^0 + c, t \to Z + c, and H^0 \to t + {\bar c} in the context of Alternative
Left-Right symmetric Models (ALRM) with extra isosinglet heavy fermions; in
this case, FCNC decays occurs at tree-level and they are only suppressed by the
mixing between ordinary top and charm quarks, which is poorly constraint by
current experimental values. This provides the possibility for future
colliders, either to detect new physics, or to improve present bounds on the
parameters of the model.


title: Fermionic states in pure 4D deconstruction

abstract:
  We study the structure of fermionic mass eigenstates in a pure
four-dimensional deconstruction approach. Unlike the case with the usual higher
dimensional deconstruction (or latticized extra dimension), here the doubling
of fermionic degrees of freedom is physical, thus there is no need to invoke
Wilson terms to eliminate them. The fermionic structure is shaped by two key
factors, namely the boundary conditions on fermions and the ratio of two
breaking scales involved. The singular value decomposition theorem of linear
algebra is employed to shed light into the phenomenologically crucial role of
chiral boundary conditions. In this approach, we can explain the "localization"
or "delocalization" nature of fermionic zero mode in flavor space and obtain
analytically all higher modes. The application of boundary conditions on
fermions to the implementation of CKM quark mixing is also found.


title:
Explicit Breaking of SO(3) with Higgs Fields in the Representations L =2
  and L =3

abstract:
  A gauged SO(3) symmetry is broken into its little groups of the
representations L=2 and L=3. Explicit Higgs potentials leading to the
spontaneous symmetry breaking are constructed. The masses of the gauge bosons
and Higgs particles are calculated in terms of the renormalizable potentials.
Emergence of Goldstone bosons arising from the absence of certain potential
terms is also discussed. Analogous structures between the cosmic strings and
disclinations of liquid crystals are noted.


title:
The Skyrme Model Revisited: An Effective Theory Approach and Application
  to the Pentaquarks

abstract:
  The Skyrme model is reconsidered from an effective theory point of view.
Starting with the most general Lagrangian up to including terms of order $p^4$,
$N_c$ and $\delta m^2$ ($\delta m\equiv m_s-m$), we obtain new interactions,
which have never been discussed in the literature. We obtain the parameter set
best fitted to the low-lying baryon masses by taking into account the
representation mixing up to $\bm{27}$. A prediction for the mainly
anti-decuplet excited nucleon $N'$ and $\Sigma'$ is given.


title: B Physics and Hadronic Matrix Elements

abstract:
  In a mini workshop on B Physics which were held at Dalian, China, a number of
lectures was given. Around 40 participants joined the workshop. In this
workshop, people discussed the heavy quark effective field theory, light cone
QCD sum rules and light cone wave functions. Much discussion was devoted to the
currently popular QCD factorization and perturbative QCD approaches in the
hadronic B decays. The physics of CP violation and physics beyond standard
model were also discussed.


title: Massive Elementary Particles and Black Holes in Resummed Quantum Gravity

abstract:
  We use exact results in a new approach to quantum gravity to show that the
classical conclusion that a massive elementary point particle is a black hole
is obviated by quantum loop effects. Further phenomenological implications are
discussed.


title: Strong Decays of Baryons

abstract:
  A Poincare-invariant description of mesonic baryon resonance decays is
presented following the point form of relativistic quantum mechanics. In this
contribution we focus on pionic decay modes. It is found that the theoretical
results in general underestimate the experimental ones considerably.
Furthermore, the problem of a nontrivial normalization factor appearing in the
definition of the decay operator is investigated. The present results for decay
widths suggest a normalization factor that is consistent with the choice
adopted for the current operator in the studies of electroweak nucleon form
factors.


title: Jet-shape observables

abstract:
  Studies of jet-shape observables in hard processes are summarized together
with future developments


title:
Deep Elastic Processes of Composite Particles in Field Theory and
  Asymptotic Freedom

abstract:
  This is an English translation of my 1977 Russian preprint. It contains the
first explicit definition of the pion distribution amplitude (DA), the
expression for the pion form factor asymptotics in terms of the pion DA, and
formulates the pQCD parton picture for hard exclusive processes.
  Abstract of the original paper:
  The large Q^2 behavior of the pion electromagnetic form factor is explicitly
calculated in the non-Abelian gauge theory to demonstrate a field-theoretical
approach to the deep elastic processes of composite particles. The approach is
equivalent to a new type of parton model.


title: Threshold Corrections in QED otimes QCD at the LHC

abstract:
  In some processes at the LHC, theoretical precisions of 1 percent are
desired. With an eye toward such precisions, we introduce the theory of the
simultaneous YFS resummation of QED and QCD to compute the size of the expected
resummed soft radiative threshold effects in precision studies of heavy
particle production at the LHC. Our results, that the soft QED threshold
effects are at the level of 0.3 percent whereas the soft QCD threshold effects
enter at the level of 20 percent, show that both must be controlled to be on
the conservative side to achieve such precision goals.


title:
Impact Parameter Dependent Parton Distributions for a Composite
  Relativistic System

abstract:
  We investigate the impact parameter dependent parton distributions for a
relativistic composite system in light-front framework. We take an effective
two-body spin-1/2 state, namely an electron dressed with a photon in QED. We
express the impact parameter dependent parton distributions in terms of
overlaps of light-cone wave functions. We obtain the scale dependence of both
fermion and gauge boson distributions and show the distortion of the pdfs in
the transverse space for transverse polarization of the state at one loop
level.


title:
Softly broken lepton number L_e - L_\mu - L_\tau with non-maximal solar
  neutrino mixing

abstract:
  We consider the most general neutrino mass matrix which leads to $\theta_{13}
= 0$, and present the formulae needed for obtaining the neutrino masses and
mixing parameters in that case. We apply this formalism to a model based on the
lepton number $\bar L = L_e - L_\mu - L_\tau$ and on the seesaw mechanism. This
model needs only one Higgs doublet and has only two right-handed neutrino
singlets. Soft $\bar L$ breaking is accomplished by the Majorana mass terms of
the right-handed neutrinos; if the $\bar L$-conserving and $\bar L$-breaking
mass terms are of the same order of magnitude, then it is possible to obtain a
consistent $\bar L$ model with a solar mixing angle significantly smaller than
$45^\circ$. We show that the predictions of this model, $m_3 = 0$ and
$\theta_{13} = 0$, are invariant under the renormalization-group running of the
neutrino mass matrix.


title:
Ultraviolet cascade in the thermalization of the classical phi^4 theory
  in 3+1 dimensions

abstract:
  We investigate the dynamics of thermalization and the approach to equilibrium
in the classical phi^4 theory in 3+1 spacetime dimensions. The non-equilibrium
dynamics is studied by numerically solving the equations of motion in a light-
cone-like discretization of the model for a broad range of initial conditions
and energy densities.A smooth cascade of energy towards the ultraviolet is
found to be the basic mechanism of thermalization.After an initial transient
stage,at a time scale of several hundreds inverse masses,the squared of the
field gradient becomes larger than the nonlinear term and a stage of universal
cascade emerges. As the cascade progresses, the modes with higher wavenumbers
exhibit weaker and weaker nonlinearities well described by the Hartree
approximation while the infrared modes retain strong selfinteractions. Two
timescales for equilibration appears.For k^2><phi^2>(t) we observe an effective
thermalization with a time scale in the thousands of inverse masses and the
Hartree approximation holds. By effective thermalization we mean that the
observable acquires the equilibrium functional form with an effective time
dependent temperature Teff, which slowly decreases with time. Infrared modes
with k^2 < <phi^2>(t) equilibrate only by time scales in the millions of
inverse masses. Infrared modes with k^2 < <phi^2>(t) equilibrate only by time
scales in the millions.Virialization and the equation of state start to set
much earlier than effective thermalization.The applicability of these results
in quantum field theory for large occupation numbers and small coupling is
analyzed.

categories: hep-ph astro-ph cond-mat.stat-mech hep-th


title: Status of the CKM Matrix

abstract:
  The experimental status and theoretical uncertainties of the
Cabibbo--Kobayashi--Maskawa (CKM) matrix describing the charge-changing weak
transitions between quarks with charges -1/3 ($d, s, b$) and 2/3 ($u, c, t$)
are reviewed. Some recent methods of obtaining phases of CKM elements are
described.


title: Photon emission in a hot QCD plasma

abstract:
  Various mechanisms of thermal photon production are reviewed and their
implications for heavy ion collisions are briefly sketched.


title:
High Precision Measurements of $\theta_{\odot}$ in Solar and Reactor
  Neutrino Experiments

abstract:
  We discuss the possibilities of high precision measurement of the solar
neutrino mixing angle $\theta_\odot \equiv \theta_{12}$ in solar and reactor
neutrino experiments. The improvements in the determination of
$\sin^2\theta_{12}$, which can be achieved with the expected increase of
statistics and reduction of systematic errors in the currently operating solar
and KamLAND experiments, are summarised. The potential of LowNu $\nu-e$ elastic
scattering experiment, designed to measure the $pp$ solar neutrino flux, for
high precision determination of $\sin^2\theta_{12}$, is investigated in detail.
The accuracy in the measurement of $\sin^2\theta_{12}$, which can be achieved
in a reactor experiment with a baseline $L \sim (50-70)$ km, corresponding to a
Survival Probability MINimum (SPMIN), is thoroughly studied. We include the
effect of the uncertainty in the value of $\sin^2\theta_{13}$ in the analyses.
A LowNu measurement of the $pp$ neutrino flux with a 1% error would allow to
determine $\sin^2\theta_{12}$ with an error of 14% (17%) at 3$\sigma$ from a
two-generation (three-generation) analysis. The same parameter
$\sin^2\theta_{12}$ can be measured with an uncertainty of 2% (6%) at 1$\sigma$
(3$\sigma$) in a reactor experiment with $L \sim60 $ km, statistics of $\sim$60
GWkTy and systematic error of 2%. For the same statistics, the increase of the
systematic error from 2% to 5% leads to an increase in the uncertainty in
$\sin^2\theta_{12}$ from 6% to 9% at 3$\sigma$. The inclusion of the
$\sin^2\theta_{13}$ uncertainty in the analysis changes the error on
$\sin^2\theta_{12}$ to 3% (9%). The effect of $\sin^2\theta_{13}$ uncertainty
on the $\sin^2\theta_{12}$ measurement in both types of experiments is
considerably smaller than naively expected.


title: Molecular Interpretation of the X(3872)

abstract:
  The discovery of the X(3872) in the 3\pi J/\psi mode is compelling evidence
for its molecular nature. A successful prediction of this decay mode and other
predictions are reviewed here.


title:
Study of a Neutrino Mass Texture Generated in Supergravity with Bilinear
  R-Parity Violation

abstract:
  We study a particular texture of the neutrino mass matrix generated in
supergravity with bilinear R-Parity violation. The relatively high value of
$\tan\beta$ makes the one-loop contribution to the neutrino mass matrix as
important as the tree-level one. The atmospheric angle is nearly maximal, and
its deviation from maximal mixing is related to the smallness of the ratio
between the solar and atmospheric mass scales. There is also a common origin
for the small values of the solar and reactor angles, but the later is much
smaller due the large mass ratio between the lightest two neutrinos. There is a
high dependence of the neutrino mass differences on the scalar mass $m_0$ and
the gaugino mass $M_{1/2}$, but a smaller one of the mixing angles on the same
sugra parameters. Measurements of branching ratios for the neutralino decays
can give important information on the parameters of the model. There are good
prospects at a future Linear Collider for these measurements, but a more
detailed analysis is necessary for the LHC.


title: Pentaquark as a NK^* bound state with TJ^P=0{3/2}^-

abstract:
  We have investigated negative-parity uudd\bar{s} pentaquarks by employing a
quark model with the meson exchange and the effective gluon exchange as qq and
q\bar{q} interactions. The system for the five quarks is dynamically solved;
the effects of qq and q\bar{q} correlations on the wave function are taken into
account.
  It is found that the masses of the pentaquarks are reasonably low. The
lowest-mass state is found to be TJ^P=0{1/2}^-, and the next lowest one is
0{3/2}^-. The former is reported to have a large width. We argue the observed
narrow peak corresponds to the latter state. It is still necessary to introduce
an extra attraction to reduce the mass further by 140 -- 280 MeV to reproduce
the observed \Theta^+ mass. Since their level splitting is found to be less
than 80 MeV, the lower level will not become a bound state below the NK
threshold even after such an attraction is introduced.
  It is also found that the relative distance of two quarks with the attractive
interaction is found to be by about 1.2 -- 1.3 times closer than that of the
repulsive one. The two-body correlation seems important in the pentaquark
systems.


title:
Hadronic decay of the gravitino in the early universe and its
  implications to inflation

abstract:
  We discuss the effects of the gravitino on the big-bang nucleosynthesis
(BBN), paying particular attention to the hadronic decay mode of the gravitino.
We will see that the hadronic decay of the gravitino significantly affect the
BBN and, for the case where the hadronic branching ratio is sizable, very
stringent upper bound on the reheating temperature after inflation is obtained.


title: Neutral pion decay in dense skyrmion matter

abstract:
  We study the density dependence of the decay $\pi^0\to \gamma \gamma$ using
the Skyrme Lagrangian to describe simultaneously both the matter background and
mesonic fluctuations. Pion properties such as mass and decay constant are
modified by the medium. This leads to large suppression at high density of both
photo-production from the neutral pion and the reverse process. The in-medium
effective charge of $\pi^{\pm}$ are also discussed in the same framework.


title:
Inclusive D^{*+-} Production in p p-bar Collisions with Massive Charm
  Quarks

abstract:
  We calculate the next-to-leading order cross section for the inclusive
production of D^{*+-} mesons in p p-bar collisions as a function of the
transverse momentum and the rapidity in two approaches using massive or
massless charm quarks. For the inclusive cross section, we derive the massless
limit from the massive theory. We find that this limit differs from the genuine
massless version with MS-bar factorization by finite corrections. By adjusting
subtraction terms, we establish a massive theory with MS-bar subtraction which
approaches the massless theory with increasing transverse momentum. With these
results and including the contributions due to the charm and anti-charm content
of the proton and anti-proton, we calculate the inclusive D^{*+-} cross section
in p p-bar collisions using realistic evolved non-perturbative fragmentation
functions and compare with recent data from the CDF Collaboration at the
Fermilab Tevatron at center-of-mass energy root(S) = 1.96 TeV. We find
reasonable, though not perfect, agreement with the measured cross sections.


title: Quantum statistics in multiple particle production

abstract:
  Effects of quantum statistics are clearly seen in the final states of
high-energy multiparticle production processes. These effects are being widely
used to obtain information about the regions where the final state hadrons are
produced. Here we briefly present and discuss the assumptions underlying most
of these analyses.


title:
Model-Independent Determination of CP Violation from Angular
  Distributions in Higgs Boson Decays to WW and ZZ at the Photon Collider

abstract:
  The model-independent determination of the Higgs-boson CP properties at the
Photon Collider at TESLA has been studied in detail, for masses between 200 and
350 GeV, using realistic luminosity spectra and detector simulation. We
consider a generic model with the CP violating Higgs tensor couplings to gauge
bosons. We introduce a new variable describing angular distributions of the
secondary WW and ZZ decay products which is very sensitive to the CP properties
of the Higgs-boson. Understanding of the detector performance turns out to be
crucial, as the influence of the acceptance corrections is similar to the
effects of CP violation. From the combined measurement of invariant mass
distributions and various angular distributions the phase describing a CP
violation can be determined to about 50 mrad after one year of Photon Collider
running.


title: Interacting Dark Energy

abstract:
  In this paper I discuss some of the phenomenologies of models of the dark
energy interacting with the ordinary matter. After a very brief review about
the current constraint on the equation of the state of the dark energy from the
SN and a new scenario of dark energy {\it the Quintom}, I present models of
Quintessential Baryo(Lepto)genesis, Quintessino dark matter and mass varying
neutrinos in details.


title: Remarks on the parity determination of narrow resonances

abstract:
  Recently several proposals were put forward to determine the parity of narrow
baryonic resonances, in particular the $\Theta^+$. In these proceedings we will
briefly comment on the general problems in this task and then discuss in detail
the potential of reactions of the type $\vec N\vec N\to\Theta^+Y$, where $Y$
denotes a hyperon (either $\Sigma$ or $\Lambda$) and the arrows indicate that a
polarized initial state is required. Besides reiterating the model--independent
properties of this class of reactions we discuss the physics content of some
model calculations.


title: Deconfinement in Matrix Models about the Gross--Witten Point

abstract:
  We study the deconfining phase transition in SU(N) gauge theories at nonzero
temperature using a matrix model of Polyakov loops. The most general effective
action, including all terms up to two spatial derivatives, is presented. At
large N, the action is dominated by the loop potential: following Aharony et
al., we show how the Gross--Witten model represents an ultra-critical point in
this potential. Although masses vanish at the Gross--Witten point, the
transition is of first order, as the fundamental loop jumps only halfway to its
perturbative value. Comparing numerical analysis of the N=3 matrix model to
lattice simulations, for three colors the deconfining transition appears to be
near the Gross--Witten point. To see if this persists for N >= 4, we suggest
measuring within a window ~1/N^2 of the transition temperature.


title: Heavy-quarkonium interaction in QCD at finite temperature

abstract:
  We explore the temperature dependence of the heavy-quarkonium interaction
based on the Bhanot-Peskin leading order perturbative QCD analysis. The Wilson
coefficients are computed solving the Schrodinger equation in a screened
Coulomb heavy-quark potential. The inverse Mellin transform of the Wilson
coefficients then allows for the computation of the 1S and 2S heavy-quarkonium
gluon and pion total cross section at finite screening/temperature. As a
phenomenological illustration, the temperature dependence of the 1S charmonium
thermal width is determined and compared to recent lattice QCD results.


title: Generalized Dirac-Pauli equation and neutrino quantum states in matter

abstract:
  Starting with the Dirac-Pauli equation for a massive neutrino in an external
magnetic field, we propose a new quantum equation for a neutrino in the
presence of the background matter. On this basis the quantum theory of a
neutrino moving in the background matter is developed: i) for the particular
case of the matter with a constant density the exact solutions of this new
equation are found and classified over the neutrino spin states, ii) the
corresponding energy spectrum is also derived accounting for the neutrino
helicity. Using these solutions we develop the quantum theory of the spin light
of neutrino ($SL\nu$) in the matter. The $SL\nu$ radiation rate and total power
are derived for different linear and circular polarizations of the emitted
photons. Within the solid base of the developed quantum approach, the existence
of the neutrino self-polarization effect in the matter is also shown.


title: Neutrino quantum states in matter

abstract:
  We propose a modified Dirac equation for a massive neutrino moving in the
presence of the background matter. The effects of the charged and
neutral-current interactions with the matter as well as the matter motion and
polarization are accounted for. In the particular case of the matter with a
constant density the exact solutions of this equation are found, the neutrino
energy spectrum in the matter is also determined. On this basis the effects of
the neutrino trapping and reflection, the neutrino-antineutrino pair
annihilation and creation in a medium are studied. The quantum theory of the
spin light of neutrino in matter ($SL\nu$) is also developed.


title:
Implications for New Physics from Fine-Tuning Arguments: I. Application
  to SUSY and Seesaw Cases

abstract:
  We revisit the standard argument to estimate the scale of new physics (NP)
beyond the SM, based on the sensitivity of the Higgs mass to quadratic
divergences. Although this argument is arguably naive, the corresponding
estimate, Lambda_SM < 2-3 TeV, works reasonably well in most cases and should
be considered a conservative bound, as it ignores other contributions to the
Higgs mass which are potentially large. Besides, the possibility of an
accidental Veltman-like cancellation does not raise significantly Lambda_SM.
One can obtain more precise implications from fine-tuning arguments in specific
examples of NP. Here we consider SUSY and right-handed (seesaw) neutrinos. SUSY
is a typical example for which the previous general estimate is indeed
conservative: the MSSM is fine-tuned a few %, even for soft masses of a few
hundred GeV. In contrast, other SUSY scenarios, in particular those with
low-scale SUSY breaking, can easily saturate the general bound on Lambda_SM.
The seesaw mechanism requires large fine-tuning if M_R > 10^7 GeV, unless there
is additional NP (SUSY being a favourite option).


title: Electroweak Symmetry Breaking: with Dynamics

abstract:
  In this note I provide a brief description of models of dynamical electroweak
symmetry breaking, including walking technicolor, top-color assisted
technicolor, the top-quark seesaw model, and little higgs theories.


title:
Possible large branching fraction of psi(3770) decays to charmless final
  states

abstract:
  The branching fraction of the psi(3770) decays into charmless final states is
estimated in the S- and D-wave charmonia mixing scheme. With the information of
the hadronic decays of J/psi and psi(3686), it is found that a large branching
fraction, up to 13% of the total psi(3770) decays may go to charmless final
states. The experimental search for these decays is also discussed.


title: Decay Constants of $D_{sJ}^*$(2317) and $D_{sJ}$(2460)

abstract:
  The resonances $D_{sJ}^*$(2317) and $D_{sJ}$(2460) which are considered to be
the $(0^+,1^+)$ doublet composed of charm and strange quarks have been
discovered recently. Using the method of Rosner which is based on the
factorization hypothesis, we calculate the lower bounds of the decay constants
of these states from the branching ratios of $B\to D D_{sJ}$ measured by Belle
and Babar.Our result shows that the decay constant of $D_{sJ}$(2460) is about
twice that of $D_{sJ}^*$(2317) on the contrary to the naive expectation of the
heavy quark symmetry which gives their equality. We show that this big
deviation originates from the large internal motion of quarks inside these
$P$-wave states and that our result is in good accord with the relativistic
quark model calculation.


title:
Hierarchical Quark Masses and Small Mixing Angles from Warped
  Intersecting Brane Models

abstract:
  We propose a novel mechanism for reproducing the realistic hierarchical
structure of the observed CKM mixing matrix and quark masses by means of
introducing a warped metric. We illustrate the method on the basis of a
specific Type IIA intersecting brane model proposed by Ibanez et al. The model
is compactified on a direct product of three tori, on which four D-brane stacks
wrap, and the intersections between two stacks collectively provide three
generations of quarks and leptons. The exponential of the area formed by the
intersection points corresponding to three matter fields is interpreted as the
Yukawa coupling among them. It is known, however, that the Yukawa matrices for
quarks are generically singular, and that it does not give definite mixing
angles nor hierarchically suppressed quark masses. We show that the newly
introduced warp effect on the internal manifold modifies the Yukawa matrix
elements and generate hierarchical quark masses and CKM mixing angles.


title: Measurement of SUSY masses via cascade decays for SPS 1a

abstract:
  If R-parity conserving supersymmetry exists below the TeV-scale, new
particles will be produced and decay in cascades at the LHC. The lightest
supersymmetric particle will escape the detectors, thereby complicating the
full reconstruction of the decay chains. In this paper we expand on existing
methods for determining the masses of the particles in the cascade from
endpoints of kinematical distributions. We perform scans in the mSUGRA
parameter space to delimit the region where this method is applicable. From the
examination of theoretical distributions for a wide selection of mass scenarios
it is found that caution must be exerted when equating the theoretical
endpoints with the experimentally obtainable ones. We provide analytic formulae
for the masses in terms of the endpoints most readily available. Complications
due to the composite nature of the endpoint expressions are discussed in
relation to the detailed analysis of two points on the SPS~1a line. Finally we
demonstrate how a Linear Collider measurement can improve dramatically on the
precision of the masses obtained.


title: Are There Diquarks in the Nucleon?

abstract:
  This work is devoted to the study of diquark correlations inside the nucleon.
We analyze some matrix elements which encode information about the
non-perturbative forces, in different color anti-triplet diquark channels. We
suggest a lattice calculation to check the quark-diquark picture and clarify
the role of instanton-mediated interactions. We study in detail the physical
properties of the 0+ diquark, using the Random Instanton Liquid Model. We find
that instanton forces are sufficiently strong to form a diquark bound-state,
with a mass of ~500 MeV, which is compatible with earlier estimates. We also
compute its electro-magnetic form factor and find that the diquark is a broad
object, with a size comparable with that of the proton.


title: Kaonic hydrogen and K^- p scattering

abstract:
  Chiral SU(3) effective field theory in combination with a relativistic
coupled channels approach is used to perform a novel analysis of the strong
interaction shift and width in kaonic hydrogen in view of the new accurate DEAR
measurements. Questions of consistency with previous K^- p data are examined.
Coulomb and isospin breaking effects turn out to be important and are both
taken into account in this work.


title: Linear Collider Physics

abstract:
  The International Linear Collider has a rich physics programme, whatever lies
beyond the standard model. Accurate measurement of the top quark mass is needed
to constrain the model or its extensions. If there is a light Higgs boson the
LHC should see it, but the ILC will pin down its characteristics and test them
against model predictions. If Supersymmetric particles appear the ILC will
measure a complementary set of them to those seen at the LHC, and may allow
extrapolation to the Grand Unified scale. And if a strong electroweak sector is
indicated the ILC will be sensitive to the presence of new structures in
difermion and diboson systems up to higher masses than the direct search range
of the LHC. Beyond the LHC and ILC there could be need for a multi TeV lepton
collider.


title: 3D parton imaging of the nucleon in high-energy pp and pA collisions

abstract:
  We discuss several examples of how the transverse spatial distribution of
partons in the nucleon, as well as multiparton correlations, can be probed by
observing hard processes (dijets) in high-energy pp (pbar p) and pA (dA)
collisions. Such studies can complement the information gained from
measurements of hard exclusive processes in ep scattering. The transverse
spatial distribution of partons determines the distribution over pp impact
parameters of events with hard dijet production. Correlations in the transverse
positions of partons can be studied in multiple dijet production. We find that
the correlation cross section measured by the CDF Collaboration, sigma_eff =
14.5 +/- 1.7^{+ 1.7}_{-2.3} mb, can be explained by "constituent quark" type
quark-gluon correlations with r_q ~ r_N / 3, as suggested by the instanton
liquid model of the QCD vacuum. Longitudinal and transverse multiparton
correlations can be separated in a model-independent way by comparing multiple
dijet production in pp and pA collisions. Finally, we estimate the cross
section for exclusive diffractive Higgs production in pp collisions at LHC
(rapidity gap survival probability), by combining the impact parameter
distribution implied by the hard partonic process with information about soft
interactions gained in pp elastic scattering.