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

Journal Article · Wed Sep 01 04:00:00 EDT 2010 · Nuclear Physics A

DOI:https://doi.org/10.1016/j.nuclphysa.2010.03.012· OSTI ID:982249

Allton, C. R. ^[1]; Leinweber, Derek B. ^[2]; Thomas, Anthony W. ^[3]; Young, Ross D. ^[4]

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1. Swansea University, Swansea, SA2 8PP, Wales, U.K.
2. Univ. of Adelaide, SA (Australia)
3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); College of William and Mary, Williamsburg, VA (United States)
4. Argonne National Lab. (ANL), Argonne, IL (United States)

The chiral extrapolation of the nucleon mass, Mn, is investigated using data coming from 2-flavour partially-quenched lattice simulations. The leading one-loop corrections to the nucleon mass are derived for partially-quenched QCD. A large sample of lattice results from the CP-PACS Collaboration is analysed, 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. This procedure is also compared with extrapolations based on polynomial forms, where the results are less encouraging.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 982249
• Report Number(s): JLAB-THY-08-884; DOE/OR/23177-0505
• Journal Information: Nuclear Physics A, Journal Name: Nuclear Physics A Journal Issue: 1-4 Vol. 840
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AGREEMENTS
CORRECTIONS
EXTRAPOLATION
MASS
NUCLEONS
PERTURBATION THEORY
POLYNOMIALS
QUANTUM CHROMODYNAMICS
QUENCHING
RANGE
VOLUME
WELLS