Indirect determination of the strange nucleon form factors from lattice QCD

Shanahan, P. E.; Zanotti, J. M.; Horsley, R.; Thomas, A. W.; Young, R. D.; Stüben, H.; Pleiter, D.; Nakamura, Y.; Schierholz, G.; Rakow, P. E. L.

Preprint/Report

DESY-2014-02613

Indirect determination of the strange nucleon form factors from lattice QCD

Shanahan, P. E. (Corresponding Author) ; Horsley, R. ; Nakamura, Y.DESY* ; Pleiter, D.Extern* ; Rakow, P. E. L. ; Schierholz, G.DESY* ; Stüben, H. ; Thomas, A. W. ; Young, R. D. ; Zanotti, J. M.

2014

(2014)

This record in other databases:

Report No.: ADP-14-10-T868; DESY-14-036; EDINBURGH-2014-08; LTH-1005; arXiv:1403.6537

Abstract: 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 $1.4\text{}\text{}{\mathrm{GeV}}^{2}$. 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: ${G}_{M}^{s}\left({Q}^{2}=0\right)=-0.07±0.03{\mu }_{N}$. At larger values of ${Q}^{2}$ both the electric and magnetic form factors are consistent with zero to within 2 standard deviations.

Keyword(s): form factor: magnetic ; nucleon: form factor ; form factor: electromagnetic ; baryon: octet ; lattice field theory ; quantum chromodynamics ; magnetic moment ; numerical calculations ; lattice ; nucleon: strangeness ; p: form factor: calculated ; n: form factor: calculated