Nucleon electromagnetic form factors from lattice QCD using a nearly physical pion mass
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We present lattice QCD calculations of nucleon electromagnetic form factors using pion masses m[subscript π] = 149, 202, and 254 MeV and an action with clover-improved Wilson quarks coupled to smeared gauge fields, as used by the Budapest-Marseille-Wuppertal Collaboration. Particular attention is given to the removal of the effects of excited-state contamination by calculations at three source-sink separations and the use of the summation and generalized pencil-of-function methods. The combination of a calculation at the nearly physical mass m[subscript π] = 149 MeV in a large spatial volume (m[subscript π]L[subscript s] = 4.2) and the removal of excited-state effects yields agreement with experiment for the electric and magnetic form factors G[subscript E](Q[superscript 2]) and G[subscript M](Q[superscript 2]) up to Q[superscript 2] = 0.5 GeV[superscript 2].
Date issued
2014-10Department
Massachusetts Institute of Technology. Center for Theoretical Physics; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical Review D
Publisher
American Physical Society
Citation
Green, J. R., J. W. Negele, A. V. Pochinsky, S. N. Syritsyn, M. Engelhardt, and S. Krieg. “Nucleon Electromagnetic Form Factors from Lattice QCD Using a Nearly Physical Pion Mass.” Phys. Rev. D 90, no. 7 (October 2014). © 2014 American Physical Society
Version: Final published version
ISSN
1550-7998
1550-2368