Proton and neutron electromagnetic form factor and charge radius in lattice QCD
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We report our recent study of nucleon electromagnetic form factor and its charge radius in lattice QCD. We compute the form factor using large size of lattice volume, more than 8 fm3, at (almost) physical pion mass which is the first realistic computation by reducing the systematic errors of the finite size correction and chiral extrapolation. We present preliminary results of not only isovector form factor but also isoscalar one, and discuss a comparison with experimental result.
KeywordsProton radius puzzle Nucleon form factor Lattice QCD
Numerical calculations were performed on the K computer in RIKEN Center for Computational Science (CCS), Hokusai at Advanced Center for Computing and Communication (ACCC) in RIKEN, XC40 at YITP in Kyoto University. This computation is also supported by Interdisciplinary Computational Science Program No. xg17i008, xg18i012 in Tsukuba CCS, General use No. G17029, G18001 at ACCC, and resources of the K computer provided by the RIKEN-CCS through the HPCI System Research project (Project ID:hp170022, hp180126 and hp180072).
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