Chiral extrapolation of octet-baryon charge radii

Details Chiral extrapolation of octet-baryon charge radii Chiral extrapolation of octet-baryon charge radii

2008-10-06

arxiv.org/abs/0810.1021v2

Phys.Rev.D79:094001,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 14 figures

Scientific paper

10.1103/PhysRevD.79.094001

The charge radii of octet-baryons obtained in quenched lattice-QCD calculations are extrapolated within heavy-baryon chiral perturbation theory. Finite-range regularization (FRR) is applied to improve the convergence of the chiral expansion and to provide estimates of quenching artifacts. Lattice values of quark distribution radii and baryon charge radii for $\mpi^2$ in the range (0.1, 0.7)$\gev^2$ are described very well with FRR. Upon estimating corrections for both finite-volume and quenching effects, the obtained charge radii of the proton, neutron and $\Sigma^-$ are in good agreement with experimental measurements. The predicted charge radii of the remaining octet-baryons have not yet been measured and present a challenge to future experiments.

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