Chiral extrapolation of octet-baryon charge radii.
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{sub pi}{sup 2} in the range (0.1,0.7) GeV{sup 2} 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{sup -} 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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); Australian Partnership for Advanced Computing; Australian Research Council
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 963268
- Report Number(s):
- ANL/PHY/JA-62742; PRVDAQ; TRN: US0903156
- Journal Information:
- Phys. Rev. D, Vol. 79, Issue 2009; ISSN 1550-7998
- Country of Publication:
- United States
- Language:
- ENGLISH
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