Journal
PHYSICAL REVIEW D
Volume 87, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.87.074001
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Funding
- National Natural Science Foundation of China [11005007, 11035007, 11175002]
- Ministry of Education of China [NCET-10-0029]
- Research Fund for the Doctoral Program of Higher Education [20110001110087]
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We extend a previous analysis of the lowest-lying octet baryon masses in covariant baryon chiral perturbation theory by explicitly taking into account the contribution of the virtual decuplet baryons. Up to next-to-next-to-next-to-leading order, the effects of these heavier degrees of freedom are systematically studied. Their effects on the light-quark mass dependence of the octet baryon masses are shown to be relatively small and can be absorbed by the available low-energy constants up to next-to-next-to-next-toleading order. Nevertheless, a better description of the finite-volume corrections of the lattice QCD data can be achieved, particularly those with small M phi L (<4), which is demonstrated by a careful study of the NPLQCD and QCDSF-UKQCD small-volume data. Finally, we show that the predicted pion- and strangeness-baryon sigma terms are only slightly changed by the inclusion of the virtual decuplet baryons. DOI: 10.1103/PhysRevD.87.074001
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