Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-10-14
Phys.Rev.D78:094003,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, 10 figures, to be published in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.78.094003
The pion-baryon sigma terms and the strange-quark condensates of the octet and the decuplet baryons are calculated by employing the method of quantum chromodynamics (QCD) sum rules. We evaluate the vacuum-to-vacuum transition matrix elements of two baryon interpolating fields in an external isoscalar-scalar field and use a Monte Carlo-based approach to systematically analyze the sum rules and the uncertainties in the results. We extract the ratios of the sigma terms, which have rather high accuracy and minimal dependence on QCD parameters. We discuss the sources of uncertainties and comment on possible strangeness content of the nucleon and the Delta.
Erkol Guray
Oka Makoto
Turan Gursevil
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