Nucleon isovector scalar charge from overlap fermions

Liu, Liuming; Chen, Ting; Draper, Terrence; Liang, Jian; Liu, Keh-Fei; Wang, Geng; Yang, Yi-Bo

doi:10.1103/PhysRevD.104.094503

Title: Nucleon isovector scalar charge from overlap fermions

Journal Article · Tue Nov 09 00:00:00 EST 2021 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.104.094503· OSTI ID:1829519

Liu, Liuming; Chen, Ting; Draper, Terrence;

;

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, m_π ≈ 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 $$g$$$^{u–d}_{S}$$ = 0.94(10)_stat(8)_sys, where the first error is the statistical error and the second is the systematic error.

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Research Organization:: Univ. of Kentucky, Lexington, KY (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0013065; AC05-06OR23177; AC05-00OR22725

OSTI ID:: 1829519

Alternate ID(s):: OSTI ID: 1831085

Report Number(s):: DOE-UKY-13065-2103.1293; PRVDAQ; 094503

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 104 Journal Issue: 9; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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