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Chiral extrapolation of octet-baryon charge radii

Wang, P.
; 
Thomas, A. W.
; 
Leinweber, D. B.
; 
Thomas, A. W.
Abstract
The charge radii of octet-baryons obtained in quenched lattice-QCD calculations are extrapolated within heavy-baryon chiral perturbation theory. Finite-range regularization 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 m(pi)(2) in the range (0.1,0.7) GeV2 are described very well with finite-range regularization. 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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2009-01-01
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Physics
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chiral_extrapolation.pdf
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Physics
DOI
https://doi.org/10.1103/PhysRevD.79.094001
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https://scholarworks.wm.edu/handle/internal/455
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