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High-precision calculation of the strange nucleon electromagnetic form factors

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journal contribution
posted on 2015-08-01, 00:00 authored by J Green, S Meinel, M Engelhardt, S Krieg, Jesse LaeuchliJesse Laeuchli, J Negele, K Orginos, A Pochinsky, S Syritsyn
We report a direct lattice QCD calculation of the strange nucleon electromagnetic form factors GEs and GMs in the kinematic range 0≤Q21.2GeV2. For the first time, both GEs and GMs are shown to be nonzero with high significance. This work uses closer to physical lattice parameters than previous calculations, and achieves an unprecedented 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. We compare our results to parity-violating electron-proton scattering data and to other theoretical studies.

History

Journal

Physical review D

Volume

92

Issue

3

Article number

031501

Pagination

1 - 7

Publisher

American Physical Society

Location

College Park, Md.

ISSN

1550-7998

eISSN

1550-2368

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2015, American Physical Society