Octet baryon masses and sigma terms in covariant baryon chiral perturbation theory

Abstract

We report an analysis of the octet baryon masses using the covariant baryon chiral perturbation theory up to next-to-next-to-next-to-leading order with and without the virtual decuplet contributions. Particular attention is paid to the finite-volume corrections and the finite lattice spacing effects on the baryon masses. A reasonable description of all the publicly available $n_f=2+1$ lattice QCD data is achieved.Utilyzing the Feynman-Hellmann theorem, we determine the nucleon sigma terms as ${\sigma }_{\pi N}=55(1)(4)$ MeV and ${\sigma }_{sN}=27(27)(4)$ MeV.

arXiv comment4 pages; presented by Xiu-Lei Ren at The Seventh International Symposium on Chiral Symmetry in Hadrons and Nuclei (Chiral 2013), October 27-30, 2013, Beijing, China

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• Lattice computation of the nucleon scalar quark contents at the physical point
• Nucleon and pion structure with lattice QCD simulations at physical value of the pion mass
• $\pi$N and strangeness sigma terms at the physical point with chiral fermions
• Scalar strangeness content of the nucleon and baryon sigma terms
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Cited by in corpus (1)

• Feynman-Hellmann theorem for resonances and the quest for QCD exotica