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76 papers · 1 filter
Next-to-Leading Order QCD Corrections to the Polarized Hadroproduction of Heavy Flavors
I. Bojak, M. Stratmann
We present the complete next-to-leading order QCD corrections to the polarized hadroproduction of heavy flavors which soon will be studied experimentally in polarized pp collisions…
Cooling for instantons and the Wrath of Nahm
S. Bilson-Thompson, F. D. R. Bonnet, D. B. Leinweber +1
The dynamics of instantons and anti-instantons in lattice QCD can be studied by analysing the action and topological charge of configurations as they approach a self-dual or anti-s…
Quark propagator from an improved staggered action in Laplacian and Landau gauges
P. O. Bowman, U. M. Heller, A. G. Williams
Studies of gauge dependent quantities are afflicted with Gribov copies, but Laplacian gauge fixing provides one possible solution to this problem. We present results for the lattic…
Quenched chiral perturbation theory for baryon form factors
Derek B. Leinweber
A new intuitive method for the rapid calculation of the leading nonanalytic behavior of hadronic observables in quenched chiral perturbation theory is presented. After proving the…
Multiple Merging Events in the Double Cluster A3128/A3125
J. A. Rose, A. E. Gaba, W. A. Christiansen +4
Multi-fiber spectroscopy has been obtained for 335 galaxies in the field of the double cluster A3128/A3125, using the 2dF multi-fiber positioner on the AAT. A total of 532 objects…
Confinement and chiral symmetry breaking via a domainlike mean field
A. C. Kalloniatis, S. N. Nedelko
Singular gauge fields in the partition function for QCD can lead to a domain-like picture for the QCD vacuum by virtue of constraints on quantum fluctuations at the singularities.…
Chiral extrapolation of lattice data for the hyperfine splittings of heavy mesons
X. -H. Guo, A. W. Thomas
Hyperfine splittings between the heavy vector (D*, B*) and pseudoscalar (D, B) mesons have been calculated numerically in lattice QCD, where the pion mass (which is related to the…
Medium modification of the nucleon axial form factor
D. H. Lu, A. W. Thomas, K. Tsushima
We study the modification of the nucleon axial form factor in nuclear matter. The internal quark substructure of the nucleon is self-consistently described by the quark meson coupl…
Improved variational description of the Wick-Cutkosky model with the most general quadratic trial action
R. Rosenfelder, A. W. Schreiber
We generalize the worldline variational approach to field theory by introducing a trial action which allows for anisotropic terms to be induced by external 4-momenta of Green's fun…
Accelerated Overlap Fermions
W. Kamleh, D. Adams, D. B. Leinweber +1
Numerical evaluation of the overlap Dirac operator is difficult since it contains the sign function of the Hermitian Wilson-Dirac operator with a negative mass term.…
Hadron Mass Extraction from Lattice QCD
S. V. Wright, D. B. Leinweber, A. W. Thomas +1
The extraction of quantities from lattice QCD calculations at realistic quark masses is of considerable importance. Whilst physical quark masses are some way off, the recent advanc…
Hyperbolic monopoles and holomorphic spheres
Michael K. Murray, Paul Norbury, Michael A. Singer
We associate to an SU(2) hyperbolic monopole a holomorphic sphere embedded in projective space and use this to uncover various features of the monopole.
The spin structure function of the neutron
Anthony W. Thomas
The neutron spin structure function, , has been of considerable interest recently in connection with the Bjorken sum rule and the proton spin crisis. Work on this problem h…
Boundary of Nuclear Physics and QCD
Anthony W. Thomas
Recent progress in lattice QCD, combined with the imminent advent of a new generation of dedicated supercomputers and advances in chiral extrapolation mean that the next few years…
Numerical study of lattice index theorem usingimproved cooling and overlap fermions
J. B. Zhang, S. O. Bilson-Thompson, F. D. R. Bonnet +3
We investigate topological charge and the index theorem on finite lattices numerically. Using mean field improved gauge field configurations we calculate the topological charge Q u…
Low-lying eigenmodes of the Wilson-Dirac operator and correlations with topological objects
Daniel-Jens Kusterer, John Hedditch, Waseem Kamleh +2
The probability density of low-lying eigenvectors of the hermitian Wilson-Dirac operator is examined. Comparisons in position and size between eigenvectors, topological charge and…
N* Masses from an Anisotropic Lattice QCD Action
F. X. Lee, D. B. Leinweber, L. Zhou +2
We report N* masses in the spin 3/2 sector from a highly-improved anisotropic action. States with both positive and negative parity are isolated via a parity projection method. The…
Pion Decay Constant, and Chiral Log from Overlap Fermions
S. J. Dong, T. Draper, I. Horvath +2
We report our calculation of the pion decay constant , the axial renormalization constant , and the quenched chiral logarithms from the overlap fermions. The calculation…
The Orevkov invariant of an affine plane curve
Walter D. Neumann, Paul Norbury
We show that although the fundamental group of the complement of an algebraic affine plane curve is not easy to compute, it possesses a more accessible quotient, which we call the…
Lattice Quark Propagator in Landau and Laplacian Gauges
P. O. Bowman, U. M. Heller, A. G. Williams
We present results for the lattice quark propagator in both Landau and Laplacian gauges using standard and improved staggered quark actions. The standard Kogut-Susskind action has…
Quenched Chiral Behavior of Hadrons with Overlap Fermions
Shao-Jing Dong, Terrence Draper, Ivan Horvath +2
We study the quenched chiral behavior of hadrons with the pseudoscalar mass as low as MeV. We look for quenched chiral logs in the pion mass, determine the renormaliz…
Topological Charge Fluctuations and Low-Lying Dirac Eigenmodes
S. J. Dong, T. Draper, I. Horvath +5
We discuss the utility of low-lying Dirac eigenmodes for studying the nature of topological charge fluctuations in QCD. The implications of previous results using the local chirali…
Structure Functions of Unstable Lithium Isotopes
K. Saito, M. Ueda, K. Tsushima +1
We study both the spin-average and spin-dependent structure functions of the lithium isotopes, Li, which could be measured at RIKEN and other nuclear facilities in the fut…
Quark-hadron duality and the nuclear EMC effect
W. Melnitchouk, K. Tsushima, A. W. Thomas
Recent data on polarized proton knockout reactions off He-4 nuclei suggest a small but nonzero modification of proton electromagnetic form factors in medium. Using model independen…