Journal Article

FZJ-2014-03715

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Nucleon structure from Lattice QCD using a nearly physical pion mass

Green, J. R. ; Engelhardt, M. ; Krieg, S.FZJ* ; Negele, J. W. ; Pochinsky, A. V. ; Syritsyn, S. N. (Corresponding Author)

2014
North-Holland Publ. Amsterdam

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Please use a persistent id in citations: http://hdl.handle.net/2128/5824  doi:10.1016/j.physletb.2014.05.075

Abstract: We report the first Lattice QCD calculation using the almost physical pion mass mπ=149 MeVmπ=149 MeV that agrees with experiment for four fundamental isovector observables characterizing the gross structure of the nucleon: the Dirac and Pauli radii, the magnetic moment, and the quark momentum fraction. The key to this success is the combination of using a nearly physical pion mass and excluding the contributions of excited states. An analogous calculation of the nucleon axial charge governing beta decay has inconsistencies indicating a source of bias at low pion masses not present for the other observables and yields a result that disagrees with experiment.

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Contributing Institute(s):

1. Jülich Supercomputing Center (JSC)

Research Program(s):

1. 411 - Computational Science and Mathematical Methods (POF2-411) (POF2-411)

Appears in the scientific report 2014

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Database coverage:
; ; ; ; Current Contents - Social and Behavioral Sciences ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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