Strange chiral nucleon form factors

Details Strange chiral nucleon form factors Strange chiral nucleon form factors

1999-04-29

arxiv.org/abs/nucl-th/9904076v2

Phys.Rev. C60 (1999) 045501

Physics

Nuclear Physics

Nuclear Theory

7 pp, REVTeX, uses epsf, minor corrections

Scientific paper

10.1103/PhysRevC.60.045501

We investigate the strange electric and magnetic form factors of the nucleon in the framework of heavy baryon chiral perturbation theory to third order in the chiral expansion. All counterterms can be fixed from data. In particular, the two unknown singlet couplings can be deduced from the parity-violating electron scattering experiments performed by the SAMPLE and the HAPPEX collaborations. Within the given uncertainties, our analysis leads to a small and positive electric strangeness radius, $ = (0.05 \pm 0.09) fm^2$. We also deduce the consequences for the upcoming MAMI A4 experiment.

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