Report/Journal Article

PUBDB-2020-00412

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Nucleon axial, scalar, and tensor charges using lattice QCD at the physical pion mass

Hasan, N. (Corresponding author)Extern* ; Green, J.DESY* ; Meinel, S. ; Engelhardt, M. ; Krieg, S. ; Negele, J. ; Pochinsky, A. ; Syritsyn, S.

2019
Inst.302363 Melville, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevD.99.114505  doi:10.3204/PUBDB-2020-00412

Report No.: DESY 19-044; DESY-19-044; arXiv:1903.06487

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.

Keyword(s): nucleon: charge ; charge: axial ; charge: scalar ; charge: tensor ; quark: mass dependence ; quantum chromodynamics ; lattice field theory ; numerical calculations ; quark: Wilson ; fermion: clover ; quark: flavor: 3 ; renormalization: nonperturbative ; current: vector ; continuum limit ; nucleon ; lattice ; nonperturbative ; excited state ; isovector

Note: 24 pages, 13 figures, 9 tables. v2: added references. v3: additional discussion of systematics and summary plot showing calculations by other groups ; publication: Phys.Rev. D99 11 (2019) 114505 ; ;

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Contributing Institute(s):

1. NIC (ZEU-NIC)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2019

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Database coverage:
; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint/Report Hasan, N. ; Green, J. (Corresponding author)DESY* ; Meinel, S. ; Engelhardt, M. ; Krieg, S. ; Negele, J. ; Pochinsky, A. ; Syritsyn, S.
Nucleon axial, scalar, and tensor charges using lattice QCD at the physical pion mass
[10.3204/PUBDB-2019-01785]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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