Nucleon electromagnetic form factors from lattice QCD using 2+1 flavor domain wall fermions on fine lattices and chiral perturbation theory

S. N. Syritsyn, J. D. Bratt, M. F. Lin, H. B. Meyer, J. W. Negele, A. V. Pochinsky, M. Procura, M. Engelhardt, Ph. Hägler, T. R. Hemmert, and W. Schroers (LHPC Collaboration)
Phys. Rev. D 81, 034507 – Published 11 February 2010

Abstract

We present a high-statistics calculation of nucleon electromagnetic form factors in Nf=2+1 lattice QCD using domain wall quarks on fine lattices, to attain a new level of precision in systematic and statistical errors. Our calculations use 323×64 lattices with lattice spacing a=0.084fm for pion masses of 297, 355, and 403 MeV, and we perform an overdetermined analysis using on the order of 3600 to 7000 measurements to calculate nucleon electric and magnetic form factors up to Q21.05GeV2. Results are shown to be consistent with those obtained using valence domain wall quarks with improved staggered sea quarks, and using coarse domain wall lattices. We determine the isovector Dirac radius r1v, Pauli radius r2v and anomalous magnetic moment κv. We also determine connected contributions to the corresponding isoscalar observables. We extrapolate these observables to the physical pion mass using two different formulations of two-flavor chiral effective field theory at one loop: the heavy baryon small scale expansion and covariant baryon chiral perturbation theory. The isovector results and the connected contributions to the isoscalar results are compared with experiment, and the need for calculations at smaller pion masses is discussed.

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  • Received 31 August 2009

DOI:https://doi.org/10.1103/PhysRevD.81.034507

©2010 American Physical Society

Authors & Affiliations

S. N. Syritsyn1, J. D. Bratt1, M. F. Lin1, H. B. Meyer1, J. W. Negele1, A. V. Pochinsky1, M. Procura1, M. Engelhardt2, Ph. Hägler3, T. R. Hemmert4, and W. Schroers5 (LHPC Collaboration)

  • 1Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 2Physics Department, New Mexico State University, Las Cruces, New Mexico 88003-8001, USA
  • 3Institut für Theoretische Physik T39, Physik-Department der TU München, James-Franck-Straße, D-85747 Garching, Germany
  • 4Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany
  • 5Institute of Physics, Academia Sinica, Taipei 115, Taiwan, R.O.C.

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Vol. 81, Iss. 3 — 1 February 2010

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