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Title: Nucleon Form Factors with 2+1 Flavors of Domain Wall Fermions and All-Mode-Averaging

We report recent progress in the calculations of the isovector nucleon electromagnetic form factors using 2+1 flavors of domain wall fermions at pion masses of 170 MeV and 250 MeV. The lattice size is fixed at 323 ×64 with a lattice cutoff scale of 1.37(1) GeV. For the calculations with Mp = 170 MeV, we employed the All-Mode-Averaging (AMA) technique, which led to roughly a factor of 20 improvement in computational efficiency and has reduced the statistical errors in our results significantly. We were also able to do calculations at two different source-sink separations, at roughly 1.3 fm and 1.0 fm, without much additional cost by reusing the low eigenmodes stored for the AMA calculations. We will present results for the isovector form factors and their derived quantities, including the Dirac and Pauli radii, anomalous magnetic moment and discuss the effects of possible excited-state contaminations. Connected contributions to the isoscalar Dirac and Pauli form factors will also be shown.
Authors:
Publication Date:
OSTI Identifier:
1121840
Report Number(s):
BNL--103420-2013-CP
R&D Project: PO-3
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: 31st International Symposium on Lattice Field Theory - LATTICE 2013; Mainz Germany; 20130729 through 20130803
Research Org:
Brookhaven National Laboratory (BNL) Riken BNL Research Center
Sponsoring Org:
USDOE SC OFFICE OF SCIENCE (SC)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS riken bnl research center