Calculation of nucleon strange quark content with dynamical overlap quarks

Details Calculation of nucleon strange quark content with dynamical overlap quarks Calculation of nucleon strange quark content with dynamical overlap quarks

2009-10-27

arxiv.org/abs/0910.5036v1

PoS LAT2009:141,2009

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, talk presented at The XXVII International Symposium on Lattice Field Theory (Lattice2009), July 26-31 2009, Peking Un

Scientific paper

We calculate the nucleon strange quark content directly from disconnected three-point functions. Numerical simulations are carried out in two-flavor QCD using the overlap quark action with up and down quark masses down to a fifth of the physical strange quark mass. To improve the statistical accuracy, we calculate the nucleon two-point functions with the low-mode averaging technique, whereas the all-to-all quark propagator is used for the disconnected quark loop. We obtain the y parameter, which is the ratio of the strange and light quark contents, y = 0.024(45) at the physical point. This is in a good agreement with our earlier calculation from the nucleon spectrum through the Feynman-Hellmann theorem.

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