Hyperon sigma terms for 2+1 quark flavours

Details Hyperon sigma terms for 2+1 quark flavours Hyperon sigma terms for 2+1 quark flavours

2011-10-22

arxiv.org/abs/1110.4971v2

Phys.Rev.D85:034506,2012

Physics

High Energy Physics

High Energy Physics - Lattice

23 pages, 12 figures, published version

Scientific paper

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.

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