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Type: Journal article
Title: An analysis of the nucleon spectrum from lattice partially-quenched QCD
Author: Armour, W.
Allton, C.
Leinweber, D.
Thomas, A.
Young, R.
Citation: Nuclear Physics A, 2010; 840(1-4):97-119
Publisher: Elsevier Science BV
Issue Date: 2010
ISSN: 0375-9474
Statement of
W. Armour, C.R. Allton, D.B. Leinweber, A.W. Thomas and R.D. Young
Abstract: The chiral extrapolation of the nucleon mass, Mn, is investigated using data coming from 2-flavour partially-quenched lattice simulations. A large sample of lattice results from the CP-PACS Collaboration is analysed using the leading one-loop corrections, with explicit corrections for finite lattice spacing artifacts. The extrapolation is studied using finite-range regularised chiral perturbation theory. The analysis also provides a quantitative estimate of the leading finite volume corrections. It is found that the discretisation, finite volume and partial quenching effects can all be very well described in this framework, producing an extrapolated value of Mn in agreement with experiment. Furthermore, determinations of the low energy constants of the nucleon mass's chiral expansion are in agreement with previous methods, but with significantly reduced errors. This procedure is also compared with extrapolations based on polynomial forms, where the results are less encouraging. © 2010.
Keywords: Nucleon spectrum
Chiral perturbation theory
Lattice gauge theory
Rights: Crown Copyright. Copyright 2010 Published by Elsevier B.V. All rights reserved.
DOI: 10.1016/j.nuclphysa.2010.03.012
Grant ID: ARC
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