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Open Access item Lowest-lying baryon masses in covariant SU(3)-flavor chiral perturbation theory

Authors:Martín Cámalich, Jorge
Geng, Li Sheng
Vicente Vacas, Manuel J.
Issue Date:19-Oct-2010
Publisher:American Physical Society
Citation:Physical Review - Section D - Particles and Fields 82 (7): 074504 (2010)
Abstract:We present an analysis of the baryon-octet and -decuplet masses using covariant SU(3)-flavor chiral perturbation theory up to next-to-leading order. Besides the description of the physical masses we address the problem of the lattice QCD extrapolation. Using the PACS-CS Collaboration data we show that a good description of the lattice points can be achieved at next-to-leading order with the covariant loop amplitudes and phenomenologically determined values for the meson-baryon couplings. Moreover, the extrapolation to the physical point up to this order is found to be better than the linear one given at leading-order by the Gell-Mann-Okubo approach. The importance that a reliable combination of lattice QCD and chiral perturbation theory may have for hadron phenomenology is emphasized with the prediction of the pion-baryon and strange-baryon sigma terms.
Publisher version (URL):http://dx.doi.org/10.1103/PhysRevD.82.074504
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