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Type: Journal article
Title: Hyperon sigma terms for 2+1 quark flavors
Author: Horsley, R.
Nakamura, Y.
Perlt, H.
Pleiter, D.
Rakow, P.
Schierholz, G.
Schiller, A.
Stüben, H.
Winter, F.
Zanotti, J.
Citation: Physical Review. D. Particles, Fields, Gravitation and Cosmology, 2012; 85(3):034506:1-034506:12
Publisher: American Physical Soc
Issue Date: 2012
ISSN: 1550-7998
Statement of
R. Horsley, Y. Nakamura, H. Perlt, D. Pleiter, P. E. L. Rakow, G. Schierholz, A. Schiller, H. Stüben, F. Winter, and J. M. Zanotti, (QCDSF-UKQCD Collaboration)
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 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.
Rights: © 2012 American Physical Society
RMID: 0020120191
DOI: 10.1103/PhysRevD.85.034506
Appears in Collections:Chemistry and Physics publications

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