We propose lattice QCD calculations of nucleon electromagnetic form factors using pion masses mπ = 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 paid 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 mπ = 149 MeV in a large spatial volume (mπLs = 4.2) and the removal of excited-state effects yields agreement with experiment for the electric and magnetic form factors GE(Q2) and GM(Q2) up to Q2 = 0.5 GeV2.
Green, J. R., et al. "Nucleon electromagnetic form factors from lattice QCD using a nearly physical pion mass." Physical Review. D, Particles, Fields, Gravitation and Cosmology, vol. 90, no. 7, Oct. 2014. https://doi.org/10.1103/physrevd.90.074507
Green, J. R., Negele, J. W., Pochinsky, A. V., Syritsyn, S. N., Engelhardt, M., & Krieg, S. (2014). Nucleon electromagnetic form factors from lattice QCD using a nearly physical pion mass. Physical Review. D, Particles, Fields, Gravitation and Cosmology, 90(7). https://doi.org/10.1103/physrevd.90.074507
Green, J. R., Negele, J. W., Pochinsky, A. V., et al., "Nucleon electromagnetic form factors from lattice QCD using a nearly physical pion mass," Physical Review. D, Particles, Fields, Gravitation and Cosmology 90, no. 7 (2014), https://doi.org/10.1103/physrevd.90.074507
@article{osti_1505598,
author = {Green, J. R. and Negele, J. W. and Pochinsky, A. V. and Syritsyn, S. N. and Engelhardt, M. and Krieg, S.},
title = {Nucleon electromagnetic form factors from lattice QCD using a nearly physical pion mass},
annote = {We propose lattice QCD calculations of nucleon electromagnetic form factors using pion masses mπ = 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 paid 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 mπ = 149 MeV in a large spatial volume (mπLs = 4.2) and the removal of excited-state effects yields agreement with experiment for the electric and magnetic form factors GE(Q2) and GM(Q2) up to Q2 = 0.5 GeV2.},
doi = {10.1103/physrevd.90.074507},
url = {https://www.osti.gov/biblio/1505598},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
issn = {ISSN 1550-7998},
number = {7},
volume = {90},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2014},
month = {10}}
Argonne National Lab. (ANL), Lemont, IL (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); New Mexico State Univ., Las Cruces, NM (United States); Univ. of California, Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 741https://doi.org/10.1016/j.nima.2013.12.035
12TH INTERNATIONAL CONFERENCE ON MESON-NUCLEON PHYSICS AND THE STRUCTURE OF THE NUCLEON (MENU 2010), AIP Conference Proceedingshttps://doi.org/10.1063/1.3647217