The lowest-lying baryon masses in covariant SU(3)-flavor chiral perturbation theory

Details The lowest-lying baryon masses in covariant SU(3)-flavor chiral perturbation theory The lowest-lying baryon masses in covariant SU(3)-flavor chiral perturbation theory

2010-03-09

arxiv.org/abs/1003.1929v3

Phys.Rev.D82:074504,2010

Physics

High Energy Physics

High Energy Physics - Lattice

Typos in formulas corrected

Scientific paper

10.1103/PhysRevD.82.074504

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.

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