• Open Access

Nucleon axial, scalar, and tensor charges using lattice QCD at the physical pion mass

Nesreen Hasan, Jeremy Green, Stefan Meinel, Michael Engelhardt, Stefan Krieg, John Negele, Andrew Pochinsky, and Sergey Syritsyn
Phys. Rev. D 99, 114505 – Published 19 June 2019

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 a0.116 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 RIMOM 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.

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  • Received 28 March 2019

DOI:https://doi.org/10.1103/PhysRevD.99.114505

Published by the American Physical Society under the terms of the 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 SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Particles & FieldsNuclear Physics

Authors & Affiliations

Nesreen Hasan1,2,*, Jeremy Green3,†, Stefan Meinel4,5, Michael Engelhardt6, Stefan Krieg1,2, John Negele7, Andrew Pochinsky7, and Sergey Syritsyn5,8

  • 1Bergische Universität Wuppertal, 42119 Wuppertal, Germany
  • 2IAS, Jülich Supercomputing Centre, Forschungszentrum Jülich, 52425 Jülich, Germany
  • 3NIC, Deutsches Elektronen-Synchroton, 15738 Zeuthen, Germany
  • 4Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
  • 5RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 6Department of Physics, New Mexico State University, Las Cruces, New Mexico 88003-8001, USA
  • 7Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 8Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA

  • *n.hasan@fz-juelich.de
  • jeremy.green@desy.de

Article Text

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Issue

Vol. 99, Iss. 11 — 1 June 2019

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