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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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94 papers · 1 filter
Lattice QCD, gauge fixing, and the transition to the perturbative regime
Anthony G. Williams
Perturbative QCD uses the Faddeev-Popov gauge-fixing procedure, which leads to ghosts and the local BRST invariance of the gauge-fixed perturbative QCD action. In the asymptotic re…
Convergence of chiral effective field theory
R. D. Young, D. B. Leinweber, A. W. Thomas
We formulate the expansion for the mass of the nucleon as a function of pion mass within chiral perturbation theory using a number of different ultra-violet regularisation schemes;…
Domains in the Nonperturbative QCD Vacuum
A. C. Kalloniatis, S. N. Nedelko
QCD vacuum gluon fields are modelled by hyperspherical domains of constant field strength. The pure glue theory confines static quarks. Solutions of the Dirac operator have chirali…
Uncovering Low-Dimensional Topological Structure in the QCD Vacuum
I. Horvath, S. J. Dong, T. Draper +5
Recently, we have pointed out that sign-coherent 4-dimensional structures can not dominate topological charge fluctuations in QCD vacuum at all scales. Here we show that an enhance…
The nonperturbative quark-gluon vertex
Jonivar Skullerud, Patrick Bowman, Ayse Kizilersu
We show results for the quark-gluon vertex in the Landau gauge, using a mean-field improved Sheikholeslami-Wohlert fermion action. We compute all the three non-zero form factors of…
K-matrices for 2D conformal field theories
E. Ardonne, P. Bouwknegt, P. Dawson
In this paper we examine fermionic type characters (Universal Chiral Partition Functions) for general 2D conformal field theories with a bilinear form given by a matrix of the form…
Meson model for f_0(980) production in peripheral pion-nucleon reactions
F. P. Sassen, S. Krewald, J. Speth
The Juelich model for pion-pion-scattering, based on an effective meson-meson Lagrangian is applied to the analysis of the S-wave production amplitudes derived from the BNL E852 ex…
Improved Determination of the Electroweak Penguin Contribution to epsilon'/epsilon in the Chiral Limit
Vincenzo Cirigliano, John F. Donoghue, Eugene Golowich +1
We perform a finite energy sum rule analysis of the flavor ud two-point V-A current correlator, Delta Pi (Q^2). The analysis, which is performed using both the ALEPH and OPAL datab…
Detection of diffuse TeV gamma-ray emission from the nearby starburst galaxy NGC 253
C. Itoh, R. Enomoto, S. Yanagita +2
We report the TeV gamma-ray observations of the nearby normal spiral galaxy NGC 253. At a distance of 2.5 Mpc, NGC 253 is one of the nearest starburst galaxies. This relative…
TeV gamma rays and cosmic rays from the nucleus of M87, a mis-aligned BL Lac object
R. J. Protheroe, A. -C. Donea, A. Reimer
The unresolved nuclear region of M87 emits strong non-thermal emission from radio to X-rays. Assuming this emission to originate in the pc scale jet aligned at to…
Rapid Variability and Annual Cycles in the Characteristic Time-scale of the Scintillating Source PKS 1257-326
H. E. Bignall, D. L. Jauncey, J. E. J. Lovell +6
Rapid radio intra-day variability (IDV) has been discovered in the southern quasar PKS 1257-326. Flux density changes of up to 40% in as little as 45 minutes have been observed in…
Quantum Discontinuity for Massive Spin 3/2 with a Lambda Term
M. J. Duff, James T. Liu, H. Sati
We show that the recently demonstrated absence of the van Dam-Veltman-Zakharov discontinuity for massive spin 3/2 with a Lambda term is an artifact of the tree level approximation,…
Baryon Resonance Phenomenology
I. C. Cloet, D. B. Leinweber, A. W. Thomas
The Japan Hadron Facility will provide an unprecedented opportunity for the study of baryon resonance properties. This talk will focus on the chiral nonanalytic behaviour of magnet…
Quenched Chiral Physics in Baryon Masses
R. D. Young, D. B. Leinweber, A. W. Thomas +1
Recent work has identified that the primary differences between quenched and dynamical spectroscopy can be described by chiral loop effects. Here we highlight the features of this…
FLIC Fermions and Hadron Phenomenology
D. B. Leinweber, J. N. Hedditch, W. Melnitchouk +5
A pedagogical overview of the formulation of the Fat Link Irrelevant Clover (FLIC) fermion action and its associated phenomenology is described. The scaling analysis indicates FLIC…
Matching functions for heavy particles
S. D. Bass, R. J. Crewther, F. M. Steffens +1
We introduce matching functions as a means of summing heavy-quark logarithms to any order. Our analysis is based on Witten's approach, where heavy quarks are decoupled one at a tim…
Direct CP Violation in : Determination of without discrete ambiguity
O. Leitner, X. -H. Guo, A. W. Thomas
Direct CP violation in the hadronic decays $\Bar{B}^{0} \to π^{+}π^{-} π^{0}$ is investigated near the peak of the taking into account the effect of mixing. Branchin…
Quark Contributions to Baryon Magnetic Moments in Full, Quenched and Partially Quenched QCD
Derek B. Leinweber
The chiral nonanalytic behaviour of quark-flavor contributions to the magnetic moments of octet baryons are determined in full, quenched and partially-quenched QCD, using an intuit…
Chiral Extrapolation of Lattice Data for Heavy Baryons
X. -H. Guo, A. W. Thomas
The masses of heavy baryons containing a b quark have been calculated numerically in lattice QCD with pion masses which are much larger than its physical value. In the present work…
Spin-3/2 Baryons in Lattice QCD
J. M. Zanotti, S. Choe, D. B. Leinweber +3
We present first results for masses of spin-3/2 baryons in lattice QCD, using a novel fat-link clover fermion action in which only the irrelevant operators are constructed using fa…
Excited Baryons from the FLIC Fermion Action
W. Melnitchouk, J. N. Hedditch, D. B. Leinweber +3
Masses of positive and negative parity excited nucleons and hyperons are calculated in quenched lattice QCD using an O(a^2) improved gluon action and a fat-link clover fermion acti…
Phase transition from nuclear matter to color superconducting quark matter
W. Bentz, T. Horikawa, N. Ishii +1
We construct the nuclear and quark matter equations of state at zero temperature in an effective quark theory (the Nambu-Jona-Lasinio model), and discuss the phase transition betwe…
Moments of Isovector Quark Distributions in Lattice QCD
W. Detmold, W. Melnitchouk, A. W. Thomas
We investigate the connection of lattice calculations of moments of isovector parton distributions to the physical regime through extrapolations in the quark mass. We consider the…
Development of an atmospheric Cherenkov imaging camera for the CANGAROO-III experiment
S. Kabuki, K. Tsuchiya, K. Okumura +10
A Cherenkov imaging camera for the CANGAROO-III experiment has been developed for observations of gamma-ray induced air-showers at energies from 10 to 10 eV. The came…