Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1851680 | Physics Letters B | 2014 | 6 Pages |
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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Authors
J.R. Green, M. Engelhardt, S. Krieg, J.W. Negele, A.V. Pochinsky, S.N. Syritsyn,