273 citations · 3.9k across the 138 of their papers we have counts for
10 papers · 1 filter
Chiral Extrapolation of Lattice Data for Heavy Meson Hyperfine Splittings
X. -H. Guo, P. C. Tandy, A. W. Thomas
We investigate the chiral extrapolation of the lattice data for the light-heavy meson hyperfine splittings D^*-D and B^*-B to the physical region for the light quark mass. The chir…
Scale-free networks in complex systems
M. Bartolozzi, D. B. Leinweber, T. Surungan +2
In the past few years, several studies have explored the topology of interactions in different complex systems. Areas of investigation span from biology to engineering, physics and…
Baryon Spectroscopy and the Constituent Quark Model
A. W. Thomas, R. D. Young
We explore further the idea that the lattice QCD data for hadron properties in the region m_π^2 > 0.2 GeV^2 can be described by the constituent quark model. This leads to a natural…
KKbar photoproduction from protons
A. Sibirtsev, J. Haidenbauer, S. Krewald +2
We study the contribution of the Drell mechanism driven by K^+ and K^- exchange to the reaction gamma N -> KKbar N. Our calculation implements the full KN and KbarN reaction amplit…
Nucleon and hadron structure changes in the nuclear medium and impact on observables
K. Saito, K. Tsushima, A. W. Thomas
We review the effect of hadron structure changes in a nuclear medium using the quark-meson coupling (QMC) model, which is based on a mean field description of non-overlapping nucle…
Experimental Tests of Charge Symmetry Violation in Parton Distributions
J. T. Londergan, D. P. Murdock, A. W. Thomas
Recently, a global phenomenological fit to high energy data has included charge symmetry breaking terms, leading to limits on the allowed magnitude of such effects. We discuss two…
Running couplings for the simultaneous decoupling of heavy quarks
Steven D. Bass, R. J. Crewther, F. M. Steffens +1
Scale-invariant running couplings are constructed for several quarks being decoupled together, without reference to intermediate thresholds. Large-momentum scales can also be inclu…
The phases of isospin asymmetric matter in the two flavor NJL model
S. Lawley, W. Bentz, A. W. Thomas
We investigate the phase diagram of isospin asymmetric matter at T=0 in the two flavor Nambu-Jona-Lasinio model. Our approach describes the single nucleon as a confined quark-diqua…
Spin 3/2 Pentaquark Resonance Signature in Lattice QCD
B. G. Lasscock, D. B. Leinweber, W. Melnitchouk +4
The possible discovery of the Theta+ pentaquark has motivated a number of studies of its nature using lattice QCD. While all the analyses thus far have focussed on spin-1/2 states,…
Okubo-Zweig-Iizuka rule violation in photoproduction
A. Sibirtsev, Ulf-G. Meißner, A. W. Thomas
We investigate OZI rule violation in omega and phi-meson photoproduction off nucleons. Data on the total cross sections indicate a large phi/omega ratio of about 0.8 at the maximal…