An analysis of the nucleon spectrum from lattice partially-quenched QCD.

Journal Article · Wed Sep 01 04:00:00 EDT 2010 · Nucl. Phys. A

DOI:https://doi.org/10.1016/j.nuclphysa.2010.03.012· OSTI ID:982640

Armour, W; Allton, C R; Leinweber, D B; Thomas, A W; Young, R D

The chiral extrapolation of the nucleon mass, M{sub n}, 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.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; Australian Research Council
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 982640
• Report Number(s): ANL/PHY/JA-62947
• Journal Information: Nucl. Phys. A, Journal Name: Nucl. Phys. A Journal Issue: Sep. 1, 2010 Vol. 840; ISSN 0375-9474
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CORRECTIONS
DATA
ENERGY
ERRORS
EXPANSION
EXTRAPOLATION
MASS
NUCLEONS
PERTURBATION THEORY
POLYNOMIALS
QUANTUM CHROMODYNAMICS
QUENCHING
VOLUME