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Hyperon sigma terms for2+1quark flavors

Horsley, R. ; Nakamura, Y. ; Perlt, H. ; Pleiter, D. ; Rakow, P. E. L. ; Schierholz, G. ; Schiller, A. ; Stüben, H. ; Winter, F. ; Zanotti, J. M.



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) flavor symmetry breaking expansion gives highly constrained (i.e. few ...

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