Ratio of strange to u/d momentum fraction in disconnected insertions

Jian Liang, Mingyang Sun, Yi Bo Yang, Terrence Draper, Keh Fei Liu

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6 Scopus citations


The ratio of the strange quark momentum fraction aŸxaŸs+s to that of light quark u or d in disconnected insertions (DI) is calculated on the lattice with overlap fermions on four domain wall fermion ensembles. These ensembles cover three lattice spacings, three volumes and several pion masses including the physical one, from which a global fitting is carried out. A complete nonperturbative renormalization and the mixing between the quark and glue operators are taken into account. We find the ratio to be aŸxaŸs+s/aŸxaŸu+u(DI)=0.795(79)(77) at u=2 GeV in the MS scheme. This ratio can be used as a constraint to better determine the strange parton distribution especially in the small x region in the global fittings of PDFs when the connected and disconnected sea are fitted and evolved separately, demonstrating a new way that connects lattice calculations with global analyses.

Original languageEnglish
Article number034514
JournalPhysical Review D
Issue number3
StatePublished - Aug 15 2020

Bibliographical note

Publisher Copyright:
© 2020 authors. Published by the American Physical Society.

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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