A/Prof Iraj
Afnan:
Address:
Flinders University
School of Chemistry, Physics & Earth Sciences
Flinders University
GPO Box 2100
Adelaide, SA 5001
AUSTRALIA
Email :
iraj.afnan@flinders.edu.au
Phone: + (61) 8 8201 2322
Prof
Reinhard Alkofer:
Address: Institute of
Theoretical Physics, Tuebingen University
Auf der Morgenstelle 14
D-72076 Tuebingen
GERMANY
Email :
Reinhard.Alkofer@uni-tuebingen.de
Phone: + (49) 7071 297 5850
Title: Analytic structure of the
gluon and quark propagators in Landau gauge QCD
Abstract : In Landau gauge QCD the
infrared behavior of the
propagator of transverse gluons can be determined analytically from
Dyson-Schwinger equations to be a power law. This propagator clearly
shows positivity violation indicating the absence of the transverse
gluons from the physical spectrum, i.e. gluon confinement. A simple
analytic structure for the gluon propagator is proposed capturing all
of its features. We provide arguments that the Landau gauge quark
propagator possesses a singularity on the real timelike axis. For this
propagator we find a positive definite Schwinger function.
Dr Chris
Allton
Adress: University of Wales Swansea
Department of Physics
Swansea SA2 8PP
U.K.
Email :
c.allton@swan.ac.uk
Phone: (+ 44) 1792 295 738
Title: QCD at non-zero
temperature and density
Abstract: We discuss the equation of state
for 2 flavor QCD at non-zero
temperature and density. Derivatives of the partition function with
respect to quark chemical potential are calculated, enabling estimates
of the pressure, quark number density and associated susceptibilities.
The phase transition line for 2 and 3-flavor QCD and the critical
endpoint in the temperature, chemical potential plane are investigated
in the low density regime.
Prof Rajeev BHALERAO
Address: Department of Theoretical
Physics,
Tata Inst. of Fundamental Research,
Homi Bhabha Road, Colaba,
Mumbai 400 005
INDIA
Email :
bhalerao@tifr.res.in
Phone: ( +91) 22 2280 4545 ext. 2219
Prof Wolfgang BENTZ
Address: Dept. of Physics, School
of Science, Tokai University
1117 Kitakaname, Hiratsuka-shi
Kanagawa 259-1292,
JAPAN
Email:
bentz@keyaki.cc.u-tokai.ac.jp
Phone: ( + 81 )463-58-1211 (ext. 3703)
Title:
Matter at normal and high densities in an effective
chiral quark theory
Abstract: We use a chiral effective quark theory to
describe the nucleon as a quark-diquark state, the equation of state
of normal nuclear matter, the properties of nucleons bound in the
medium, and the phase transition to color superconducting quark
matter at high densities.
Dr Francois BISSEY
Address: Massey University
Institute of Fundamental Sciences
Private Bag 11 222
Palmerston North
New Zealand
Email:
F.R.Bissey@massey.ac.nz
Phone:
Title: Preliminary results on the flux tube
of the 3 quark potential
Abstract: We present our first results on the
formation and shape of the gluon
flux tube linking a three quark system on the lattice. We investigate
several kinds of paths on the lattice to connect the quarks together
and study the possible dependence of the flux tube shape on those paths.
Prof David BLASCHKE
Address: Rostock University
Department of Physics
University of Rostock
Universitaetsplatz 3
D-18051 Rostock
Germany
Email:
david.blaschke@physik.uni-rostock.de
Phone: ( + 49) 381-498 6960
Title: Exploring the QCD phase diagram
Abstract: A nonlocal chiral quark model is
introduced which reproduces meson
masses and decay constants as well as lattice results for the quark
propagator
in the vacuum. The extension to nonzero temperatures and chemical potentials
is
performed within the Matsubara formalism in order to obtain the critical
lines
for chiral symmetry restoration, deconfinement and color superconductivity
in
the phase diagram. Implications for observables in heavy-ion collisions and
compact stars are presented.
Mrs Sharada BOINEPALLI
Address: The University of Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
AUSTRALIA
Email Address:
sboinepa@physics.adelaide.edu.au
Phone: ( + 61) 8 83033424
Prof Stanley BRODSKY
Address: SLAC Stanford University
5725 Sand Hill Road
Menlo Park, CA 94025
USA
Email :
sjbth@slac.stanford.edu
Phone: (+ 1 ) 650 926 2644 01
Title: Introduction and
Applications of Light-Front QCD
Abstarct: The concept of a wave
function of a hadron as a composite of relativistic
quarks and gluons is naturally formulated in terms of the light-front Fock
expansion at fixed light-front time. The freedom to choose the
light-like quantization four-vector provides an explicitly covariant
formulation of light-front quantization and can be used to determine the
analytic structure of light-front wave functions. LFWFs with definite
total angular momentum are eigenstates of a kinematic angular momentum
operator and satisfy all Lorentz symmetries. The analytic dependence of
LFWFs on invariant mass implies that hadron form factors are analytic
functions of the momentum transfer squared in agreement with dispersion
theory and perturbative QCD. A model incorporating leading-twist
perturbative QCD constraints is consistent with recent data for the
ratio of proton Pauli and Dirac form factors.
A remarkable consequence of AdS/CFT correspondence is the
nonperturbative derivation of dimensional counting rules for hard
scattering processes. String/gauge duality also predicts the QCD
power-law behavior of light-front Fock-state hadronic wavefunctions
with arbitrary orbital angular momentum at high momentum transfer.
The form of these wavefunctions can be used as an initial ansatz for a
variational treatment of the light-front QCD Hamiltonian.
It is usually assumed that the structure functions measured in deep
inelastic lepton-proton scattering are simply the probability
distributions for finding quarks and gluons in the target nucleon defined
from light-front wavefunctions. In fact, gluon exchange between the
fast outgoing quark and the target spectator effects leading-twist
structure functions in a profound way, leading to diffractive
leptoproduction processes, shadowing of nuclear structure functions, and
target spin asymmetries. In particular, the final-state interactions
from gluon exchange lead to single-spin asymmetries in semi-inclusive
deep inelastic lepton-proton scattering which are not power-law
suppressed in the Bjorken limit.
A. Prof Matthias BURKHARDT
Address: New Mexico State
University
Department of Physics
Box 30001, MSC 3D
New Mexico State University
Las Cruces, NM 88003
USA
Email :
burkardt@nmsu.edu
Phone: 1 505 646 1928
Title: Quark Correlations and Single Spin
Asymmetries
Abstract: A simple physical mechanism to
explain the Sivers effect is proposed.
The average transverse momentum of the quarks in gauge invariant Sivers
distributions is related to correlations work the gauge field at
$x^-=\infty$. Using finiteness conditions for light-cone Hamiltonians we
are thus able to relate the average transverse momentum of the quarks to
quark correlations in the transverse plane. This result has a nice
semi-classical interpretation where the average transverse momentum of the
outgoing quark arises from the Lorentz force due to the chromo electric
field of the spectators. As a byproduct, we develop a simple rule to
relate the sign of the generalized parton distribution E with the sign of
the Sivers effect.
Mr Ian
Cloet
Address: The University of Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
Email :
icloet@physics.adelaide.edu.au
Phone: (+ 61) 8 8303 3427
Dr
Rodney
Crewther
Address: Department of
Physics,
University of Adelaide,
Adelaide, SA 5005
AUSTRALIA
Email :
rcrewthe@physics.adelaide.edu.au
Phone: ( +61 )
8 8303 4576/3993
Title:
Heavy quarks decoupled simultaneously
Abstract: If there is more
than one large mass scale, large scale-invariant
logarithms occur, so conventional methods
for evolving through thresholds are not applicable. The problem can be
circumvented by introducing several
running couplings, one for each heavy quark, and requiring that
scale-invariant expressions for simultaneous
decoupling agree with known results for quarks decoupled one at a time. The
classic case of heavy quarks
decoupling from the weak neutral current is solved explicitly to NLO
accuracy.
Mr Benjamin CROUCH
Address: The University of Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
Email:
bcrouch@physics.adelaide.edu.au
Phone: ( + 61) 8 8303 3428
Prof. Robert DELBOURGO
Address: School of
Mathematics and Physics
University of Tasmania
GPO Box 252-21, Hobart
Tasmania, 7001
AUSTRALIA
Email:
Bob.Delbourgo@utas.edu.au
Phone: ( + 61) 3 6226 2403
Title: Nonperturbative
characteristics of Green functions
Abstract: I will describe a
method of deriving a "nonperturbative" Green function
in a manner whichcaptures the topology of the corresponding Feynman
diagram, via the skeleton expansion. This allows one to determine the
anomalous dimensions of the field theory as a function of the coupling
constants.
Dr Will DETMOLD
Address: University of Washington
Department of Physics, Box 351560
University of Washington
Seattle, WA 98195
USA
Email:
wdetmold@phys.washington.edu
Phone: ( + 1) 2065437482
Title: Electroweak properties of two-nucleon
systems in lattice QCD
Abstract: We discuss how to determine the
short-distance contributions to
electroweak matrix elements in the two-nucleon sector from lattice
QCD. Such contributions result from meson-exchange currents in
potential models, and from local four-nucleon operators in nuclear
effective field theory.
We make use of the energy shifts that two nucleons undergo when
restricted to a finite (periodic) volume. By analyzing these shifts in
the presence of a background electroweak field, we can determine the
short-distance contribution to the deuteron magnetic moment, the near
threshold cross-section of $n p \rightarrow d \gamma$, and neutrino
induced deuteron breakup. The last of these is only poorly known
experimentally and will be the leading source of uncertainty in the
SNO determination of neutrino mass and mixing matrices and a direct
calculation in lattice QCD would be invaluable.
Dr Christian FISCHER
Address: University of Tuebingen
Institut fuer Theoretische Physik
Auf der Morgenstelle 14
72076 Tuebingen
Germany
Email:
chfi@tphys.physik.uni-tuebingen.de
Phone: ( + 49) 7071 2978641
Title: Dynamical Chiral Symmetry
Breaking in Landau Gauge QCD
Abstract: We present approximate, non-perturbative
solutions for the
gluon, ghost and quark propagators as well as the running coupling
from a coupled system of Dyson--Schwinger equations (DSE) in Landau
gauge QCD. In the infrared we find a weakly vanishing gluon
propagator and a singular ghost propagator in accordance with the
Kugo-Ojima confinement criterion. In the quark mass function we
obtain a sizeable amount of dynamical chiral symmetry breaking. The
generated quark masses agree well with phenomenological values. In
the infrared momentum regime the propagators are determined
analytically from the DSEs. This allows us to continue our results
into the time-like momentum regime. We obtain a cut on the real
time-like momentum axis corresponding to negative norm contributions
in the gluon spectral function. On the other hand the quark
propagator satisfies positivity and possesses a singularity on the
real time-like momentum axis.
Mr Marco GHIOTTI
Address: The University of Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
AUSTRALIA
Email:
mghiotti@physics.adelaide.edu.au
Phone: (+61) 8 8303 3427
Prof Jeff GREENSITE
Address: Physics and Astronomy
Dept.
San Francisco State University
1600 Holloway Ave
San Francisco CA 94132
USA
Email :
greensit@stars.sfsu.edu
Phone: ( +1) 415 338 1600
Title: Coulomb Energy and the Phase
Structure of Non-Abelian Gauge Theories
Abstract: The confining property of
the gluon propagator in Coulomb
gauge is related to the unbroken realization of a certain global
remnant gauge symmetry. We introduce an order parameter for this
symmetry, and investigate its behavior in various gauge theories, with
and without matter, at zero and high temperatures.
Assist. Prof. Chris HAMER
Address: UNSW
School of Physics
University of NSW
Sydney NSW 2052
AUSTRALIA
Email :
C.Hamer@unsw.edu.au
Phone: ( +61) 2 9385 4590
Title: The Hamiltonian Limit of
(3+1)D SU(3) lattice gauge theory on anisotropic lattices
Abstract: The extreme anisotropic
limit of Euclidean SU(3) Yang-Mills
theory is examined to extract the Hamiltonian limit, using standard
path integral Monte Carlo (PIMC) methods. We examine the mean
plaquette and string tension and compare them to results obtained
within the Hamiltonian framework of Kogut and Susskind. The results
are a significant improvement upon previous Hamiltonian estimates,
despite the extrapolation procedure necessary to extract
observables. We conclude that the PIMC method is a reliable method of
obtaining results for the Hamiltonian version of the theory. Our
results also clearly demonstrate the universality between the
Hamiltonian and Euclidean formulations of lattice gauge theory. It is
particularly important to take into account the renormalization of
both the anisotropy and the Euclidean coupling in obtaining these results.
Mr John HEDDITCH
Address: The University of Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
AUSTRALIA
Email Address:
jhedditc@physics.adelaide.edu.au
Phone: ( +61) 8 8303 3428
Title: FLIC
Mesons: Hybrids and Exotics
Abstract: We investigate a variety of
interpolating fields for mesons, including a
number that include contributions from excited glue, using the FLIC fermion
action and an improved gluonic action. We show that these
operators do generate mesons whose masses are equivalent to the standard
operators within errors. We also find a signal for the $J^{PC} = 1^{-+}$
exotic meson.
Mr Hideaki IIDA
Address: Tokyo Institute of
Technology
Ohkayama 2-12-1, Meguro, Tokyo 152-8551
JAPAN
Email:
iida@th.phys.titech.ac.jp
Phone: (+ 81) 3-5734-3546
Title: Lattice-QCD based Schwinger-Dyson
approach for Chiral Phase Transition
Abstract: We propose the
Schwinger-Dyson(SD) formalism based on
lattice QCD, i.e., LQCD-based SD formalism, for the study of dynamical
chiral-symmetry breaking in QCD. We extract the kernel function
$K(p^2)$ in the SD equation from the lattice data of the quark
propagator in the Landau gauge. As remarkable features, we find
infrared vanishing and intermediate enhancement of the kernel function
$K(p^2)$ in the SD equation. We apply the LQCD-based SD equation to
thermal QCD, and calculate the quark mass function and quark
condensate at the finite temperature. We find chiral symmetry
restoration at the critical temperature $T_c \sim 100MeV$.
Dr Alexander KALLONIATIS
Address: The University of Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
Email:
akalloni@physics.adelaide.edu.au
Phone: (+ 61 ) 8 8303 3426
Title: Axial U(1) symmetry in the
domain model
Abstract: The domain model is
briefly reviewed including the mechanism
of confinement and the properties of quark fluctuations in the
model. The logarithm of the quark determinant displays the abelian
anomaly. This in turn allows for spontaneous breaking of
SU(3,L)xSU(3,R) without an axial U(1) degeneracy in the ground
state. The manifestation of these properties in pseudoscalar
correlation functions is discussed.
Dr Waseem KAMLEH
Address: The University of Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
AUSTRALIA
Email:
wkamleh@physics.adelaide.edu.au
Phone: (+ 61) 8 8303 3425
Title: FLIC Overlap Quark Propagator
Abstract: Chiral symmetry on the
lattice has been realised with overlap
fermions. The use of the FLIC fermion action as the overlap kernel has
been shown to have computational benefits. The FLIC overlap propagator in
quenched QCD is studied to gain insight into its physical properties. The
recently developed means of moving to full QCD is also discussed.
Dr Ayse KIZILERSU
Address: The University of Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
AUSTRALIA
Email:
akiziler@physics.adelaide.edu.au
Phone: (+ 61) 8303 3549
Title:
Unquenched Fermion -Gauge Boson Vertex in the
Covariant Gauge
Abstract: I will be discussing
unquenched fermion-gauge boson vertex in the
general covariant gauge. I will also discuss the the importance
of the vertex.
Mr
Ben LASSCOCK
Address: The University of
Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
AUSTRALIA
Email:
blasscoc@physics.adelaide.edu.au
Phone: (+ 61) 8 8388 2193
Ms Sarah LAWLEY
Address: The University of
Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
AUSTRALIA
Email:
slawley@physics.adelaide.edu.au
Phone: (+ 61) 8 8303 3543
Assoc Prof Derek
LEINWEBER
Address: The University of
Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
AUSTRALIA
Email:
dleinweb@physics.adelaide.edu.au
Phone: (+ 61) 8 8303 3423
Title:
Precise
Determination of the Strangeness Magnetic Moment of the Nucleon
Abstarct: By combining the
constraints of charge symmetry with modern chiral
extrapolation techniques and recent low-mass FLIC-fermion
lattice-QCD simulations of the individual quark contributions to
the magnetic moments of the nucleon octet, a precise determination
of the strange magnetic moment of the proton is obtained. The
result is consistent with the latest experimental measurements but
is an order of magnitude more precise. This poses a tremendous
challenge for future experiments.
Dr Max LOHE
Address: The University of
Adelaide
Department of Physics and Mathematical Physics
SA 5005
AUSTRALIA
Email:
Max.Lohe@adelaide.edu.au
Phone: (+ 61) 8 8303 5315
Prof Tim
LONDERGAN
Address: Indiana University
Wells Scholars Program
1331 E 10th St
Bloomington, IN, 47408-3964
USA
Email :
tlonderg@indiana.edu
Phone: (+ 1) 812-855-9491
Title: The NuTeV Anomaly:
Something Old? Something New?
Abstract: The NuTeV collaboration
has measured both charged-
and neutral-current cross sections for neutrinos on iron. They
have extracted a value of the Weinberg angle that differs by 3
standard deviations from the best value obtained in EW reactions.
We will review possible explanations for this result, both within
and outside the Standard Model.
Prof. Bruce
MCKELLAR
Address: University of Melbourne
School of Physics
Vic 3010
AUSTRALIA
Email:
b.mckellar@ph.unimelb.edu.au
Phone: (+ 61 ) 3 - 8344 5122
Title: Harmonic Oscillator spectrum for glueball states in 2+1 D in large N limit
Abstract: Hamiltonian lattice gauge theory and analytic variational
techniques are used
to calculate glueball masses for finite values of N < 26, in the SU(N) theory in 2 + 1
dimensions. The results are then extrapolated to infinite N, and a simple oscillator
spectrum is found in that limit.
Dr Wally MELNITCHOUK
Address: Jefferson Lab
12000 Jefferson Avenue,
MS12H2,
Newport News, VA 23606,
USA
Email:
wmelnitc@jlab.org
Phone: (+ 1) 757 269 5854
Title: Jefferson Lab Phenomenology: an overview
Abstract: I review some recent highlights from the experimental program at
Jefferson Lab, and their impact on our understanding of the structure
of hadrons. One of the most exciting developments of recent years
in hadronic physics has been the discovery of the Theta+ pentaquark.
I discuss the current status of pentaquark searches, as well as other
results from excited nucleon spectroscopy. The study of exclusive
reactions has provided some unexpected results for electromagnetic form
factors of the nucleon. As a byproduct, it has led to a re-evaluation of
the validity of the one-photon exchange approximation in electron-hadron
scattering. In inclusive scattering, I review the surprising findings
of a quark-hadron duality in both spin-averaged and spin-dependent
structure functions measured in the nucleon resonance and deep-inelastic
regions. Finally, I preview future plans for CEBAF at 12 GeV, and the
prospects of a high-luminosity polarised electron-ion collider.
Dr Hirobumi MINEO
Address: National Taiwan
University
1 Roosevelt road, Section 4, Taipei, Dept. of Physics,
Taiwan
Email :
mineo@phys.ntu.edu.tw
Phone: 886 2-3366-5154
Title: Generalized parton
distributions of the nucleon based on the Faddeev approach to the NJL model
Abstract: Recently, there have
been much theoretical studies on the generalized
parton distributions (GPDs). They contain
Information on the parton correlations and the internal spin structure of
the
nucleon.. Some of the important properties of the GPDs are that that first
moments give the form factors and, in the forward limit they give back to
forward parton distributions. There are two approaches to model the nucleon
GPDs. One is using the Radyushkin^ %G $,3u= (B %@ ansatz to construct the
nucleon GPDs
phenomenologically in terms of the forward parton distributions and meson
distribution amplitudes. Another approach is a direct calculation of nucleon
GPDs using quark models . For example, GPDs have been calculated with MIT
bag
model, which does not respect chiral symmetry, and show a quite weak
xi-dependence. Calculation has also been performed with chiral quark soliton
model in large N_c limit. It should be noted that the resulting GPDs in the
latter model preserves the sum rules and !
positivity, while it is not the case in the bag model calculation. In this
work
we calculate the nucleon GPDs in the NJL model based on the quark-diquark
Faddeev approach. The NJL model is an effective quark theory of low energy
QCD,
and exhibits the spontaneous breaking of chiral symmetry. Since NJL model is
a
field-theoretic one, the obtained GPDs will satisfy the sum rules.
Previously
we have calculated forward parton distributions in the same approach, and
reproduced the qualitative features of forward parton distributions. In this
talk we will present our results for the nucleon GPDs and discuss their
xi-dependence.
Prof. Hideo NAKAJIMA
Address: Utsunomiya
University
Department of Information Science
Fac. of Engineering
7-1-2 Yoto, Utsunomiya
Tochigi Pref. 321-8585
JAPAN
Email:
nakajima@is.utsunomiya-u.ac.jp
Phone: (+ 81)-
28-689-6245
Title:
Numerical Study of
Lattice Landau Gauge QCD and the Gribov Copy Problem
Abstract: The
infrared properties of lattice Landau gauge QCD of SU(3)
are studied by measuring gluon propagator, ghost propagator, QCD
running coupling and Kugo-Ojima parameter of $\beta=6.0,
16^4,24^4,32^4$ and $\beta=6.4, 32^4, 48^4, 56^4$
lattices. $\beta=6.4, 48^4$ and $56^4$ lattices allow measuring the
ghost propagator in the momentum range 0.48 GeV/c $\leq q\leq$ 14.6
GeV/c, and 0.41 GeV/c $\leq q\leq$ 14.6 GeV/c, respectively. By the
larger lattice measurements, it becomes clearer that (1) the infrared
singularity of gluon is weaker than the tree level, and it looks
approaching constant, and that of ghost is stronger than the tree
level, but weaker than $q^{-3}$, (2) the runnning coupling measured by
the product of the gluon dressing function and the ghost dressing
function squared has the maximum of about 1.2 at around $q=0.5$ GeV/c,
and behaves either approaching constant or even decreasing as $q$
approaches zero, and (3) magnitude of the Kugo-Ojima parameter is
getting larger but staying around $-0.8$ in contrast to the expected
value $-1$ in the continuum theory.
Gribov noise problem was studied by performing the fundamental modular
gauge (FMG) fixing with use of the parallel tempering method of
$\beta=2.2, 16^4$ SU(2) configurations. Findings are that the gluon
propagator almost does not suffer noises, but the Kugo-Ojima parameter
and the ghost propagator in the FMG becomes about 6 \% less in the
infrared region than those suffering noises. It is expected that these
qualitative aspects seen in SU(2) will reflect in the infrared
properties of SU(3) QCD as well.
Mrs Maria PARAPPILLY
Address: The University of
Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
AUSTRALIA
Email:
mparappi@physics.adelaide.edu.au
Phone: 61 8 -83033424
Prof Byung-Yoon PARK
Address: Chungnam National
University
Department of Physics
Taejeon 305-764
KOREA
Email:
bypark@cnu.ac.kr
Phone: 82 42-821-6557
Title: A unified approach to
dense matter
Abstract: We present a
summary of work done on dense hadronic matter, based on
the Skyrme model, which provides a unified approach to high density, valid
in
the large N_c limit. In our picture, dense hadronic matter is described by
the classical soliton
configuration with minimum energy for the given
baryon number density. By incorporating the meson fluctuations on
such ground state we obtain an effective Lagrangian for meson
dynamics in a dense medium. Our starting point has been the Skyrme
model defined in terms of pions, thereafter we have extended and
improved the model by incorporating other degrees of freedom such
as dilaton, kaons and vector mesons.
Prof. Michael
PENNINGTON
Address:
University of Durham
Institute for Particle Physics Phenomenology,
Physics Department,
Durham DH1 3LE
UK
Email:
m.r.pennington@durham.ac.uk
Phone: (+ 44) 191 334 3668
Title: Building bridges in strong physics
Abstract:
The strong physics regime of QCD is responsible for confinement,
the hadron spectrum, dynamical symmetry breaking and the structure of
the QCD vacuum. The solution of these problems requires bridges to be built
connecting models to QCD,
connecting the lattice to the continuum,
connecting the unphysical to physics, and
connecting theory with experiment.
A sketch of these connections using the Schwinger-Dyson/
Bethe-Salpeter Equations will be given in an attempt to provide
insight into the strong physics regime of QCD.
Dr Michele
PEPE
Address: University of Bern
Institute of Theoretical Physics Sidlerstrasse 5
CH-3012 Bern
Switzerland
Email: pepe@itp.unibe.ch
Phone: (+ 41) 31 631 86 21
Title: The deconfinement phase
transition in Yang-Mills theory with general gauge
group G
Abstract: We consider Yang-Mills theories with main sequence Lie
groups G = SU(N),
SO(N), Sp(N) or with exceptional Lie groups G = G(2),
F(4), E(6), E(7), and E(8). The groups G(2), F(4), and E(8) have a
trivial
center and need not have a deconfinement phase transition at all. As
conjectured by Svetistky and Yaffe, the deconfinement phase
transition of
a (d+1)-dimensional Yang-Mills theory with gauge symmetry G is in the
universality class of a center(G)-symmetric d-dimensional spin model,
provided the transition is second order.
For rank 1, i.e. for SU(2)=SO(3)=Sp(1), this is well established.
We have investigated the symplectic groups Sp(2)=SO(5) and Sp(3)
finding
a first order phase transition in d=3. Hence, for rank 2, i.e. for
SU(3),
Sp(2), and G(2), the Svetitsky-Yaffe conjecture does not apply. The
same
is true for the rank 3 groups SU(4)=SO(6) and Sp(3), as well as for
SU(6)
and SU(8) in d=3. We expect that in d=3 the Svetitsky-Yaffe
conjecture
only applies to SU(2). Interestingly, for d=2 several groups lead to
second order phase transitions. Indeed, using a finite-size scaling
analysis, we confirm the Svetitsky-Yaffe conjecture beyond SU(N)
groups,
namely for Sp(2). However, for Sp(3) Yang-Mills theory, we find again
a
first order phase transition.
Based on these results, we conjecture that the size of the group -
and
not the center symmetry - determines the order of the phase
transition.
Dr Alfredo
RAYA
Address: Universidad de
Colima
Bernal Diaz del Castillo #340, Colonia Villa San Sebastian.
Colima, Colima, C. P. 28045
MEXICO
Email
:
raya@ucol.mx
Phone:
( + 52) 312-316-1000 ext
48005
Title: Fermion Propagator in
quenched QED3 in the light of its Landau-Khalatnikov-Fradkin transformation
Abstract: We study the
gauge dependence of the fermion propagator in
quenched QED3 with and without dynamical symmetry breaking in the
light of its Landau-Khalatnikov-Fradkin Transformation (LKFT). In the
former case, starting with the massive bare propagator in the Landau
gauge, we obtain non perturbative propagator in an arbitrary covariant
gauge. At the one-loop level it yields exact wavefunction
renormalization and correct $(\alpha \xi)$ terms for the mass
function. Also, we obtain valuable information for the higher order
perturbative expansion of the propagator. As for the case of
dynamical chiral symmetry breaking, we start by approximating the
numerical solution to the Schwinger-Dyson equation in Landau gauge in
the rainbow approximation in terms of analytic functions. We then LKF
transform this result to obtain the dynamically generated fermion
propagator in an arbitrary covariant gauge. We find that the results
obtained have nice qualitative features. We also extend this exercise
to the cases involving more reliable ansatze for the vertex and
encounter similar (and improved) qualitative features
Prof. Hugo
Reinhardt
Address: Tuebungen University
Institut fuer Theoretische Physik
Auf der Morgenstelle 14
D-72076 Tuebingen
GERMANY
Email:
h.reinhardt@uni-tuebingen.de
Phone: ( + 49) 70712978632
Title: Quark and gluon
confinement in Coulomb gauge
Abstract: The Yang-Mills
Schrdinger equation is variationally solved
in Coulomb gauge for the vacuum sector using a trial wave functional,
which is strongly peaked at the Gribov horizon. We find the absence of
gluons in the infrared and also a confining quark potential.
Dr Craig
Roberts
Address: Physics Division
Argonne National Laboratory
9700 South Cass Avenue
Argonne, IL 60439 - 4843
USA
Email:
cdroberts@anl.gov
Phone: (+ 1) 630 252 4095
Title: Confinement,
Dynamical Chiral Symmetry Breaking, Bound States, and the Quark-Gluon
Vertex.
Abstract: Dyson-Schwinger
equations furnish a Poincare' covariant approach to
hadron physics. They reveal that dynamical chiral symmetry breaking
is tied to the long-range behaviour of the strong interaction and
make predictions corroborated by modern lattice-QCD simulations. A
hallmark in the contemporary use of DSEs is the existence of a
nonperturbative, symmetry preserving truncation that enables the
proof of exact results; e.g., the leptonic decay constant of every
pseudoscalar meson except the pion vanishes in the chiral limit.
Moreover, this scheme allows features of the dressed-quark-gluon
vertex and their role in the gap and Bethe-Salpeter equations to be
explored. It may be argued that quenched lattice data indicate the
existence of net attraction in the colour-octet projection of the
quark-antiquark scattering kernel. The presence of such attraction
impacts upon the uniformity with which solutions of truncated
equations converge pointwise to solutions of the complete gap a nd
vertex equations. For current-quark masses less than the scale set
by dynamical chiral symmetry breaking in the chiral limit, the
dependence of the dressed-quark-gluon vertex on the current-quark
mass is weak. A vertex model whose diagrammatic content is
explicitly enumerable enables the systematic construction of a
vertex-consistent Bethe-Salpeter kernel and thereby an exploration of
the consequences of net attraction in the colour-octet channel for
the strong interaction spectrum. With rising current-quark mass the
rainbow-ladder truncation provides an increasingly accurate estimate
of a bound state's mass. Furthermore, the splitting between vector
and pseudoscalar meson masses vanishes as the current-quark mass
increases. The absence of colour-antitriplet diquarks from the
strong interaction spectrum is contingent upon the net amount of
attraction in the colour-octet projected quark-antiquark scattering
kernel. There is a window within which diquarks appear. The am ount
of attraction suggested by lattice results is outside this domain.
Prof. Gerrit
Schierholz
Address: DESY
Platanenallee 6
15738 Zeuthen
Germany
Email:
Gerrit.Schierholz@desy.de
Phone: (+ 49) 33762 77238
Title: Lattice QCD: From
Basics to Quark Masses
Abstract: After a brief
introduction to lattice QCD, and a review of
recent developments in the field, I will present a truely unquenched
and nonperturbative determination of the light quark masses.
Dr Edward
Shuryak
Address: State
University of New York at Stony Brook
Department of Physics and Astronomy,
Stony Brook, NY, 11790
USA
Email:
shuryak@tonic.physics.sunysb.edu
Phone: 631-6328127
Title: The QCD Vacuum
Abstract: In this
introductory lecture we review the tools and results obtained
by non-perturbative methods about properties of the ground state of QCD.
It is a very complicated medium, made of virtual quarks and gluons, and
including complicated topological objects -- instantons, monopoles and
vortices. Since hadrons can be viewed as its collective excitations,
a lot of information -- in form of the so called vacuum condensates and
correlations functions -- can be deduced from experiment. We will emphasize
the phenomenon of chiral symmetry breaking, which is now understood in
significant details. As theoretical and numerical methods show, the instantons
play a leading role here. We will briefly review consequences of that
for hadronic structure.
Dr Jonivar
Skullerud
Adress:
School of Mathematics
Trinity College
Dublin 2
IRELAND
Email :
jonivar@skullerud.name
Phone: 353 1
608 3566
Title:
Quark-gluon vertex in arbitrary kinematics
Abstract: The
vector part of the Landau-gauge quark-gluon vertex is
computed on the lattice for arbitrary kinematics, using an
O(a)-improved Wilson fermion action.
Prof Josef
Speth
Address:
Institute Fuer Kernphysik
FZ-Juelich
D-52425 Juelich
Germany
Email :
j.speth@fz-juelich.de
Phone:
(+ 49) 2461
614168
Assoc. Prof. Hideo
Suganuma
Address:
Faculty of Science
Tokyo Institute of Technology
Ohokayama 2-12-1,Meguro,
Tokyo 152-8551
Japan
Email :
suganuma@th.phys.titech.ac.jp
Phone:
(+ 81)
3-5734-3546
Title:
Study of Quark Confinement in Baryons with Lattice QCD
Abstract:
We study the ground-state three-quark (3Q) potential and the
excited-state 3Q potential using SU(3) lattice QCD. From the accurate
and thorough calculation for more than 300 different patterns of 3Q
systems, the static ground-state 3Q potential is found to be well
described by the Coulomb plus Y-type linear potential, i.e., Y-ansatz,
within 1%-level deviation. This fact indicates that quark confinement
in baryons is realized through the Y-type flux-tube formation among
quarks. With lattice QCD, we calculate also the excited-state
potential in the 3Q system, and find the gluonic excitation energy to
be about 1 GeV. This large gluonic-excitation energy would play an
essential role to the success of the quark model for the low-lying
hadrons in terms of the absence of the gluonic mode.
Prof. Adam
Szczepaniak
Address:
Department of Physics
Indiana University
Bloomington, IN 47405
USA
Email :
aszczepa@indiana.edu
Phone: 812-855-3977
Title: Flux tubes in the
Coulomb gauge
Abstract: I will discuss
aspects of confinement in the Coulomb gauge and patterns
of the gauge field distributions near static sources. Comparison with
lattice and phenomenological models will made and spectroscopy will be
discussed.
Dr Peter
Tandy
Address:
Department of Physics
Kent State University
Kent, OH 44242
USA
Email :
tandy@cnr2.kent.edu
Phone:
(+ 1)
330-672-2246
Title:
Nonperturbative QCD Phenomenology and Light Quark Physics
Abstract: We
prresent recent results and developments in understanding
the extent to which nonperturbative QCD dynamics is reflected in
light quark meson physics. In particular, aspects dominated by
dynamical chiral symmetry breaking are emphasized.
Prof Anthony
Thomas
Address: The
University of Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
AUSTRALIA
Email :
athomas@physics.adelaide.edu.au
Phone: (+ 61) 8 8303 3547
Title:
Fundamentals of Nuclear Physics
Abstract : The
powerful combination of lattice QCD with modern chiral
extrapolation techniques is providing us with tremendous insight into
hadron structure. One of the fundamental questions for nuclear physics
is the extent to which this understanding can shed new light onto the
properties of nuclear matter - at high as well as normal densities. We
shall outline a recent advance which links the structure of the nucleon
with the saturation of nuclear matter. We also review recent
contributions to cosmology and physics beyond the Standard Model which
follow from the new and deeper understanding of how QCD works.
Prof E.
Terry
Tomboulis
Address: UCLA-
University of California
Dept. of Physics and Astronomy
Box 951547
Los Angeles, CA 90095-1547
USA
Email :
tombouli@physics.ucla.edu
Phone:(+ 1) 310 -
825 4674
Title:
RG
decimations and confinement in SU(N) LGT
Abstract:
Confinement in SU(N) LGT is studied via approximate RG
decimations that connect the short to long distance regimes. The
decimations turn out to provide both upper and lower bounds on the
exact partition function. This leads to a representation of the exact
partition function in terms of successive decimations whose effective
couplings flows are related to those of the computable approximate
decimations. The implications for a derivation of confinement from
first principles will be discussed.
Dr Ping
Wang
Address: The
University of Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
AUSTRALIA
Email :
pwang@physics.adelaide.edu.au
Phone:
(+ 61) 8
8303 3545
Title: Hadronic
matter at finite temperature and density
Abstract: We
propose a chiral SU(3) quark mean field model and apply
it to the hadronic matter at finite temperature and density. The
liquid-gas phase transition of nuclear matter and strange hadronic
matter, comloub instability of finite nuclei and chiral symmetry
restoration are investigated in this model. The phase transition from
hadronic matter to quark matter are also discussed.
Prof. Uwe-Jens
Wiese
Address: Institut
fuer Theoretische Physik
Universitaet Bern
Sidlerstrasse 5
3012 Bern
Switzerland
Email :
wiese@itp.unibe.ch
Phone:
(+ 41) 31
631 8504
Title:
Pions
versus Magnons: From QCD to Antiferromagnets and Quantum Hall Ferromagnets
Abstract: The
low-energy dynamics of pions and magnons are analogous
in many surprising ways. Pions couple to photons through the
Goldstone-Wilczek current representing the baryon number of
Skyrmions. This gives rise to the decay of the neutral pion into two
photons. Magnons in ferro- and antiferromagnets couple to a
Goldstone-Wilczek current for Baby-Skyrmions, which again induces
their decay into two photons. Photon-magnon conversion in a magnetic
field (the condensed matter analog of photon-axion conversion) may
shed some light on the mechanism for high-temperature
superconductivity. In QCD with more than two flavors the
Wess-Zumino-Witten term arises with a quantized prefactor --- the
number of colors N_c. In multi-layer quantum Hall ferromagnets an
analog of the Wess-Zumino-Witten term arises. Its prefactor is the
unquantized anyon statistics angle. Both Skyrmions and Baby-Skyrmions
can decay through electromagnetic interactions. For example, the
condensed matter an! alog of a monopole catalyzing baryon decay is a
charged wire transporting charge out of a magnet.
Prof. Anthony
Williams
Address : The University of
Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
AUSTRALIA
Email :
Anthony.Williams@adelaide.edu.au
Phone: (+ 61) 8 8303
3546
Title: On defining QCD nonperturbatively: lattice QCD, Dyson-Schwinger
equations and BRST invariance
Abstract: While there is
general agreement on the definition of
perturbative QCD, the relevant degrees of freedom,
quarks and gluons, have no corresponding aymptotic states.
In order to define QCD, one must define it nonperturbatively.
Lattice, Dyson-Schwinger equation, and BRST definitions
are all fundamentally different definitions of nonperturbative
QCD in their standard implementations. This difference has its
origins in how gauge-fixing is implemented and in how Gribov
copies are treated. An overview of these issues will be
presented and the implications discussed.
Dr Stewart
Wright
Address :
Division of Theoretical Physics
Department of Mathematical Sciences
The University of Liverpool
Liverpool, L69 3BX
U.K.
Email :
svwright@liv.ac.uk
Phone:
(+ 44) 151
794 3778
Title :
The
Pseudoscalar Decay Constant
Abstract :
Recent results will be presented from the UKQCD collaboration in
calculating the pseudoscalar decay constant in Lattice QCD. The
discussion will include issues and insights gained from investigating the
extrapolation and interpolation to the pion and kaon experimental points.
Dr Ross
Young
Address : The University of Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
AUSTRALIA
Email :
ryoung@physicsl.adelaide.edu.au
Phone : (+ 61) 8303 3428
Title : Finite Range Regularisation of Chiral
Effective Field Theory
Abstract : I will review the renormalization
procedure connecting the
unrenormalized parameters of finite-range regularised (FRR) chiral
effective field theory with the low-energy constants of
dimensionally-regulated chiral perturbation theory. After
highlighting the improved convergence properties of the FRR expansion,
focus will be placed on results from recent lattice simulations of
quenched QCD where unmistakeable signatures of quenched chiral
nonanalytic behaviour has been observed. Here the magnetic moment of
the Delta+ baryon is of particular interest. Finally, methods to
quantitatively estimate the corrections anticipated upon unquenching
the simulations will be presented, with specific applications to the
low-lying baryon mass spectrum and octet-baryon magnetic moments.
Dr Valentin
Zakharov
Address : MPI-Max-Planck Institut fuer Physik
Werner-Heisenberg Institut
Foehringer Ring 6
80805 Muenchen
Germany
Email : xxz@mppmu.mpg.de
Phone:
(+
49) 89 32 354 238
Title : Non-perturbative match of ultraviolet renormalon
Abstract : The paper is motivated by observation of a kind of branes in
the vacuum state of the lattice SU(2) gluodynamics. The branes
represent two-dimensional vortices whose total area scales in physical
units while the non-Abelian action diverges in the ultraviolet. We
consider the question whether effects of the branes can be
accommodated into the continuum theory. We demonstrate that at least
in case of the gluon condensate (plaquette action) and of the heavy
quark potential the contribution of the branes corresponds to the
ultraviolet renormalon. Thus, the vortices might represent a
non-perturbative match of the ultraviolet renormalon. Such an
identification constrains, in turn, properties of the branes.
Dr Jianbo
Zhang
Address : The University
of Adelaide
CSSM-Department of Physics and Mathematical Physics
5005, Adelaide
AUSTRALIA
Email :
jzhang@physics.adelaide.edu.au
Phone: (+ 61) 8-83033544
Title:
The Scaling behavior of the overlap quark propagator in Landau gauge
Abstract: The properties
of the momentum space quark propagator in
Landau gauge are examined for the overlap quark action in quenched
lattice QCD. Numerical calculations are done on three lattices with
different lattice spacings and similar physical volumes to explore the
approach of the quark propagator towards the continuum limit. We have
calculated the nonperturbative momentum-dependent wavefunction
renormalization function $Z(p)$ and the nonperturbative mass function
$M(p)$ for a variety of bare quarks masses and perform a simple linear
extrapolation to the chiral limit. We find the behavior of $Z(p)$ and
$M(p)$ are in reasonable agreement between the two finer lattices in
the chiral limit, however the data suggest that an even finer lattice
is desirable. The large momentum behavior is examined in terms of the
quark condensate.
Dr Daniel
Zwanziger
Address: Physics
Department
New York University
4 Washington Place
New York, NY 10003
USA
Email :
daniel.zwanziger@nyu.edu
Phone:
(+ 1)
212-998-7732
Title:
Gauss's law,
boundary conditions, color-confinement
Abstract: We
discuss discuss Gauss's law and the boundary conditions
that hold in the hamiltonian formulation of QCD in the Coulomb
gauge. We develop a Schwinger-Dyson type calculation scheme, and
present a simple calculation of the color-Coulomb potential.