Strange quark momentum fraction from overlap fermion

Mingyang Sun, Yi Bo Yang, Keh Fei Liu, Ming Gong

Research output: Contribution to journalConference articlepeer-review


We present a calculation of (x)s for the strange quark in the nucleon. We also report the ratio of the strange (x) to that of u/d in the disconnected insertion which will be useful in constraining the global fit of parton distribution functions at small x. We adopt overlap fermion action on 2 + 1 flavor domain-wall fermion configurations on the 243 x 64 lattice with a light sea quark mass which corresponds to mπ = 330 MeV. Smeared grid Z3 sources are deployed to calculate the nucleon propagator with low-mode substitution. Even-odd grid sources and time-dilution technique with stochastic noises are used to calculate the high mode contribution to the quark loop. Low mode averaging (LMA) for the quark loop is applied to reduce the statistical error of the disconnected insertion calculation. We find the ratio (x)s/(x)DIu/d = 0.78(3) in this study.

Original languageEnglish
Article number142
JournalProceedings of Science
VolumePart F130500
StatePublished - 2014
Event32nd International Symposium on Lattice Field Theory, LATTICE 2014 - New York, United States
Duration: Jun 23 2014Jun 28 2014

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ASJC Scopus subject areas

  • General


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