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Nucleon Structure from Lattice QCD Using a Nearly Physical Pion Mass

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arxiv 1209.1687 v2 pith:ITUPJAZG submitted 2012-09-08 hep-lat hep-phnucl-th

J. R. Green , M. Engelhardt , S. Krieg , J. W. Negele , A. V. Pochinsky , S. N. Syritsyn This is my paper · ORCID
classification hep-lathep-phnucl-th
keywords pionmassnucleonphysicalcalculationexperimentlatticenearly
verification ladder T0 review T1 audit T2 compute T3 formal
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We report the first Lattice QCD calculation using the almost physical pion mass mpi=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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  1. Moments of nucleon generalized parton distributions from lattice QCD simulations at physical pion mass

    hep-lat 2019-08 conditional novelty 6.0 of 10

    The paper reports the first controlled lattice QCD extraction of the nucleon's second Mellin moments and vector and axial generalized form factors at the physical pion mass.

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