Journal Article

FZJ-2015-05432

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png High-precision calculation of the strange nucleon electromagnetic form factors

Green, J. (Corresponding author) ; Meinel, S. (Corresponding author) ; Engelhardt, M. ; Krieg, S.FZJ* ; Laeuchli, J. ; Negele, J. ; Orginos, K. ; Pochinsky, A. ; Syritsyn, S.

2015
Soc. [S.l.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/11126  doi:10.1103/PhysRevD.92.031501

Abstract: We report a direct lattice QCD calculation of the strange nucleon electromagnetic form factors $G_E^s$ and $G_M^s$ in the kinematic range 0≤Q²≲1.2GeV². For the first time, both $G_E^s$ and $G_M^s$ 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.

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Contributing Institute(s):

1. Jülich Supercomputing Center (JSC)

Research Program(s):

1. 511 - Computational Science and Mathematical Methods (POF3-511) (POF3-511)

Appears in the scientific report 2015

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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