Determination of the strange nucleon form factors

The strange contribution to the electric and magnetic form factors of the nucleon is determined at a range of discrete values of Q^{2} up to 1.4  GeV^{2}. This is done by combining a recent analysis of lattice QCD results for the electromagnetic form factors of the octet baryons with experimental de...

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Veröffentlicht in:Physical review letters 2015-03, Vol.114 (9), p.091802-091802, Article 091802
Hauptverfasser: Shanahan, P E, Horsley, R, Nakamura, Y, Pleiter, D, Rakow, P E L, Schierholz, G, Stüben, H, Thomas, A W, Young, R D, Zanotti, J M
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Sprache:eng
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Zusammenfassung:The strange contribution to the electric and magnetic form factors of the nucleon is determined at a range of discrete values of Q^{2} up to 1.4  GeV^{2}. This is done by combining a recent analysis of lattice QCD results for the electromagnetic form factors of the octet baryons with experimental determinations of those quantities. The most precise result is a small negative value for the strange magnetic moment: G_{M}^{s}(Q^{2}=0)=-0.07±0.03μ_{N}. At larger values of Q^{2} both the electric and magnetic form factors are consistent with zero to within 2 standard deviations.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.114.091802