TY - JOUR
T1 - Nucleon form factors with light Wilson quarks
AU - Green, Jeremy
AU - Engelhardt, Michael
AU - Krieg, Stefan
AU - Meinel, Stefan
AU - Negele, John
AU - Pochinsky, Andrew
AU - Syritsyn, Sergey
N1 - Funding Information:
We thank Zoltan Fodor for useful discussions and the Budapest-Marseille-Wuppertal collaboration for making some of their configurations available to us. This research used resources of the Argonne Leadership Computing Facility at Argonne National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under contract #DE–AC02–06CH11357, resources at Forschungszentrum Jülich, and facilities of the USQCD Collaboration, which are funded by the Office of Science of the U.S. Department of Energy.
Funding Information:
During this research JG, SK, SM, JN, AP and SS were supported in part by the U.S. Department of Energy Office of Nuclear Physics under grant #DE–FG02–94ER40818, ME was supported in part by DOE grant #DE–FG02–96ER40965, SS was supported in part by DOE contract #DE– AC02–05CH11231, SK was supported in part by Deutsche Forschungsgemeinschaft through grant SFB–TRR 55, and JG was supported in part by the PRISMA Cluster of Excellence at the University of Mainz.
PY - 2013
Y1 - 2013
N2 - We present nucleon observables - primarily isovector vector form factors - from calculations using 2+1 flavors of Wilson quarks. One ensemble is used for a dedicated high-precision study of excited-state effects using five source-sink separations between 0.7 and 1.6 fm. We also present results from a larger set of calculations that include an ensemble with pion mass 149 MeV and box size 5.6 fm, which nearly eliminates the uncertainty associated with extrapolation to the physical pion mass. The results show agreement with experiment for the vector form factors, which occurs only when excited-state contributions are reduced. Finally, we show results from a subset of ensembles that have pion mass 254 MeV with varying temporal and spatial box sizes, which we use for a controlled study of finite-volume effects and a test of the "mπL = 4" rule of thumb.
AB - We present nucleon observables - primarily isovector vector form factors - from calculations using 2+1 flavors of Wilson quarks. One ensemble is used for a dedicated high-precision study of excited-state effects using five source-sink separations between 0.7 and 1.6 fm. We also present results from a larger set of calculations that include an ensemble with pion mass 149 MeV and box size 5.6 fm, which nearly eliminates the uncertainty associated with extrapolation to the physical pion mass. The results show agreement with experiment for the vector form factors, which occurs only when excited-state contributions are reduced. Finally, we show results from a subset of ensembles that have pion mass 254 MeV with varying temporal and spatial box sizes, which we use for a controlled study of finite-volume effects and a test of the "mπL = 4" rule of thumb.
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M3 - Conference article
AN - SCOPUS:84976333416
SN - 1824-8039
VL - 29-July-2013
JO - Proceedings of Science
JF - Proceedings of Science
M1 - 276
T2 - 31st International Symposium on Lattice Field Theory, LATTICE 2013
Y2 - 29 July 2013 through 3 August 2013
ER -