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Proton Isovector Helicity Distribution on the Lattice at Physical Pion Mass

Author(s)
Lin, Huey-Wen; Chen, Jiunn-Wei; Ji, Xiangdong; Jin, Luchang; Li, Ruizi; Liu, Yu-Sheng; Yang, Yi-Bo; Zhang, Jian-Hui; Zhao, Yong; ... Show more Show less
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Abstract
We present a state-of-the-art calculation of the isovector quark-helicity Bjorken-x distribution in the proton using lattice-QCD ensembles at the physical pion mass. We compute quasidistributions at proton momenta P[subscript z]∈{2.2,2.6,3.0}  GeV on the lattice and match them systematically to the physical parton distribution using the large-momentum effective theory. We reach an unprecedented precision through high statistics in simulations, large-momentum proton matrix elements, and control of excited-state contamination. The resulting distribution with combined statistical and systematic errors is in agreement with the latest phenomenological analysis of the spin-dependent experimental data, in particular, Δ[¯ over u](x)>Δd[¯ over d](x).
Date issued
2018-12
URI
http://hdl.handle.net/1721.1/119792
Department
Massachusetts Institute of Technology. Center for Theoretical Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Lin, Huey-Wen, et al. “Proton Isovector Helicity Distribution on the Lattice at Physical Pion Mass.” Physical Review Letters, vol. 121, no. 24, Dec. 2018. © 2018 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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