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.
|Journal||Physical Review D|
|State||Published - Nov 1 2021|
Bibliographical noteFunding Information:
We thank the RBC/UKQCD Collaboration for sharing their domain-wall gauge configurations with us. L. L. thanks the support from the Strategic Priority Research Program of Chinese Academy of Sciences with Grant No. XDB34030301, the CAS Interdisciplinary Innovation Team program and Guangdong Provincial Key Laboratory of Nuclear Science with No. 2019B121203010. J. L. thanks the support from the Guangdong Major Project of Basic and Applied Basic Research No. 2020B0301030008 and Science and Technology Program of Guangzhou No. 2019050001. This work is partially supported by the U.S. DOE Grant No. DE-SC0013065 and DOE Grant No. DE-AC05-06OR23177 which is within the framework of the TMD Topical Collaboration. This research used resources of the Oak Ridge Leadership Computing Facility at the Oak Ridge National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. This work used Stampede time under the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation Grant No. ACI-1053575. We also thank the National Energy Research Scientific Computing Center (NERSC) for providing HPC resources that have contributed to the research results reported within this paper. We acknowledge the facilities of the USQCD Collaboration used for this research in part, which are funded by the Office of Science of the U.S. Department of Energy.
© 2021 authors. Published by the American Physical Society.
ASJC Scopus subject areas
- Nuclear and High Energy Physics