Calculation of nucleon strange quark content with dynamical overlap quarks
Abstract
We calculate the nucleon strange quark content directly from disconnected threepoint functions. Numerical simulations are carried out in twoflavor 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 twopoint functions with the lowmode averaging technique, whereas the alltoall 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 FeynmanHellmann theorem.
 Publication:

arXiv eprints
 Pub Date:
 October 2009
 arXiv:
 arXiv:0910.5036
 Bibcode:
 2009arXiv0910.5036J
 Keywords:

 High Energy Physics  Lattice
 EPrint:
 7 pages, talk presented at The XXVII International Symposium on Lattice Field Theory (Lattice2009), July 2631 2009, Peking University, Beijing, China