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Octet baryon masses and sigma terms from an SU(3) chiral extrapolation · Around

2009

Octet baryon masses and sigma terms from an SU(3) chiral extrapolation

Young, R. D., Thomas, A. W.

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We report an analysis of the impressive new lattice simulation results for octet baryon masses in 2+1-flavor QCD.

The analysis is based on a low order expansion about the chiral SU(3) limit in which the symmetry breaking arises from terms linear in the quark masses plus the variation of the Goldstone boson masses in the leading chiral loops.
The baryon masses evaluated at the physical light quark masses are in remarkable agreement with the experimental values, with a model dependence considerably smaller than the rather small statistical uncertainty.
From the mass formulae one can evaluate the sigma commutators for all octet baryons.

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