@article{a86c556ac1a64f70be3da80e40055db9,
title = "Nucleon axial, scalar, and tensor charges using lattice QCD at the physical pion mass",
abstract = "We report on lattice QCD calculations of the nucleon isovector axial, scalar, and tensor charges. Our calculations are performed on two 2+1-flavor ensembles generated using a 2-HEX-smeared Wilson-clover action at the physical pion mass and lattice spacings a≈0.116 and 0.093 fm. We use a wide range of source-sink separations - eight values ranging from roughly 0.4 to 1.4 fm on the coarse ensemble and three values from 0.9 to 1.5 fm on the fine ensemble - which allows us to perform an extensive study of excited-state effects using different analysis and fit strategies. To determine the renormalization factors, we use the nonperturbative Rome-Southampton approach and compare RI′-MOM and RI-SMOM intermediate schemes to estimate the systematic uncertainties. Our final results are computed in the MS scheme at scale 2 GeV. The tensor and axial charges have uncertainties of roughly 4%, gT=0.972(41) and gA=1.265(49). The resulting scalar charge, gS=0.927(303), has a much larger uncertainty due to a stronger dependence on the choice of intermediate renormalization scheme and on the lattice spacing.",
author = "Nesreen Hasan and Jeremy Green and Stefan Meinel and Michael Engelhardt and Stefan Krieg and John Negele and Andrew Pochinsky and Sergey Syritsyn",
note = "Funding Information: We thank the Budapest-Marseille-Wuppertal Collaboration for making their configurations available to us. Calculations for this project were done using the Qlua software suite , and some of them made use of the QOPQDP adaptive multigrid solver . Fixing to Landau gauge was done using the Fourier-accelerated conjugate gradient algorithm . This research used resources on the supercomputers JUQUEEN , JURECA , and JUWELS at J{\"u}lich Supercomputing Centre (JSC) and Hazel Hen at the High Performance Computing Centre Stuttgart (HLRS). We acknowledge computing time granted by the John von Neumann Institute for Computing (NIC) and by the HLRS Steering Committee. S. M. is supported by the U.S. Department of Energy (DOE), Office of Science, Office of High Energy Physics under Award No. DE-SC0009913. S. M. and S. S. are also supported by the RIKEN BNL Research Center under its joint tenure track fellowships with the University of Arizona and Stony Brook University, respectively. M. E., J. N., and A. P. are supported in part by the Office of Nuclear Physics of the U.S. Department of Energy (DOE) under Grants No. DE-FG02-96ER40965, No. DE-SC-0011090, and No. DE-FC02-06ER41444, respectively. S. K. and N. H. received support from Deutsche Forschungsgemeinschaft Grant No. SFB-TRR 55. Publisher Copyright: {\textcopyright} 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the «https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP.",
year = "2019",
month = jun,
day = "19",
doi = "10.1103/PhysRevD.99.114505",
language = "English (US)",
volume = "99",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "11",
}