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Title: High-precision calculation of the strange nucleon electromagnetic form factors

We report a direct lattice QCD calculation of the strange nucleon electromagnetic form factors GsE and GsM in the kinematic range 0 ≤ Q2 ≤ 1.2GeV2. For the first time, both GsE and GsM are shown to be nonzero with high significance. This work uses closer-to-physical lattice parameters than previous calculations, and achieves an unprecented statistical precision by implementing a recently proposed variance reduction technique called hierarchical probing. We perform model-independent fits of the form factor shapes using the z-expansion and determine the strange electric and magnetic radii and magnetic moment. As a result, we compare our results to parity-violating electron-proton scattering data and to other theoretical studies.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [6] ;  [8]
  1. Johannes Gutenberg Univ., Mainz (Germany)
  2. Univ. of Arizona, Tucson, AZ (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. New Mexico State Univ., Las Cruces, NM (United States)
  4. Bergische Univ., Wuppertal (Germany); Julich Supercomputing Centre, Julich (Germany)
  5. College of William and Mary, Williamsburg, VA (United States)
  6. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  7. College of William and Mary, Williamsburg, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  8. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
OSTI Identifier:
1214828
Report Number(s):
JLAB-THY--15-2043; DOE/OR/23177--3345; arXiv:1505.01803
Journal ID: ISSN 1550-7998; PRVDAQ
DOE Contract Number:
FG02–94ER40818; FG02–96ER40965; FC02–12ER41890; FG02-04ER41302; AC05-06OR23177; AC02–05CH11231; ACI-1053575; CCF-121834; SFB–TRR
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles, Fields, Gravitation and Cosmology; Journal Volume: 92; Journal Issue: 3
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English