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Paper detail

Nucleon Structure from Lattice QCD Using a Nearly Physical Pion Mass

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.

preprint2014arXivOpen access
J. R. GreenM. EngelhardtS. KriegJ. W. NegeleA. V. PochinskyS. N. Syritsyn
hep-phhep-latnucl-th
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J. R. GreenM. EngelhardtS. KriegJ. W. NegeleA. V. PochinskyS. N. Syritsyn

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