Nucleon electromagnetic form factors from lattice QCD using 2+1 flavor domain wall fermions on fine lattices and chiral perturbation theory
Name
Syritsyn-2010-Nucleon electromagnetic form factors from lattice QCD using 2+1 flavor domain wall fermions on fine lattices and chiral perturbation theory.pdf
Size
1.05 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Syritsyn, Sergey Nikolaevich
Bratt, Jonathan D.
Lin, Ming Fang
Meyer, Harvey B.
Negele, John W.
Pochinsky, Andrew
Procura, Massimiliano
Engelhardt, M.
Hagler, Ph.
Hemmert, T. R.
Date Issued
February 2010
Journal
Physical Review D
Publisher
American Physical Society
Citation
Syritsyn, S. N., et al. (2010). Nucleon electromagnetic form factors from lattice QCD using $2+1$ flavor domain wall fermions on fine lattices and chiral perturbation theory. Phys. Rev. D 81: 034507/1-37. © 2010 The American Physical Society
Version
Final published version
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=0.084 fm 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 Q2≈1.05 GeV2. 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.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.81.034507
