Calculation of nucleon strange quark content with dynamical overlap quarks
Abstract
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.
- Publication:
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arXiv e-prints
- Pub Date:
- October 2009
- DOI:
- 10.48550/arXiv.0910.5036
- arXiv:
- arXiv:0910.5036
- Bibcode:
- 2009arXiv0910.5036J
- Keywords:
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- High Energy Physics - Lattice
- E-Print:
- 7 pages, talk presented at The XXVII International Symposium on Lattice Field Theory (Lattice2009), July 26-31 2009, Peking University, Beijing, China