Nucleon isovector scalar charge from overlap fermions

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2 Scopus citations


We calculate the nucleon isovector scalar charge in lattice QCD using overlap fermions on five ensembles of gauge configurations generated by the RBC/UKQCD collaboration using the domain-wall quark action with 2+1 dynamical flavors. The five ensembles cover five pion masses, mπ≈139, 171, 302, 337 and 371 MeV, and four lattice spacings, a≈0.06, 0.08, 0.11 and 0.14 fm. Three to six valence quark masses are computed on each ensemble to investigate the pion mass dependence. The extrapolation to the physical pion mass, continuum and infinite volume limits is obtained by a global fit of all data to a formula originated from partially quenched chiral perturbation theory. The excited-states contamination is carefully analyzed with 3-5 sink-source separations and multi-state fits. Our final result, in the MS¯ scheme at 2 GeV, is gSu-d=0.94(10)stat(8)sys, where the first error is the statistical error and the second is the systematic error.

Original languageEnglish
Article number094503
JournalPhysical Review D
Issue number9
StatePublished - Nov 1 2021

Bibliographical note

Publisher Copyright:
© 2021 authors. Published by the American Physical Society.

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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