Hyperon sigma terms for 2+1 quark flavours

Roger Horsley, Yoshifumi Nakamura, Holger Perlt, Dirk Pleiter, Paul Rakow, Gerrit Schierholz, Arwed Schiller, Hinnerk Stuben, Frank Winter, James Zanotti

Research output: Contribution to journalArticlepeer-review

Abstract

QCD lattice simulations determine hadron masses as functions of the quark masses. From the gradients of these masses and using the Feynman-Hellmann theorem the hadron sigma terms can then be determined. We use here a novel approach of keeping the singlet quark mass constant in our simulations which upon using an SU(3) flavour symmetry breaking expansion gives highly constrained (i.e. few parameter) fits for hadron masses in a multiplet. This is a highly advantageous procedure for determining the hadron mass gradient as it avoids the use of delicate chiral perturbation theory. We illustrate the procedure here by estimating the light and strange sigma terms for the baryon octet
Original languageEnglish
Pages (from-to)034506
Number of pages23
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume85
Issue number3
DOIs
Publication statusPublished - 22 Feb 2012

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