Nucleon strange quark content in 2+1-flavor QCD

Details Nucleon strange quark content in 2+1-flavor QCD Nucleon strange quark content in 2+1-flavor QCD

2010-12-09

arxiv.org/abs/1012.1907v1

Physics

High Energy Physics

High Energy Physics - Lattice

7pages, talk presented at The XXVIII International Symposium on Lattice Field Theory, Lattice2010

Scientific paper

We calculate the strange quark content of the nucleon directly from its disconnected three-point function in N_f=2+1 QCD. Chiral symmetry is crucial to avoid a possibly large contamination due to operator mixing, and is exactly preserved by employing the overlap quark action. We also use the all-to-all quark propagator and the low-mode averaging technique in order to accurately calculate the relevant nucleon correlator. Our preliminary result extrapolated to the physical point is f_{T_s} = 0.013(12)(16). This is in good agreement with our previous estimate in N_f=2 QCD as well as those from our indirect calculations using the Feynman-Hellmann theorem.

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