Lin, Huey-Wen and Chen, Jiunn-Wei and Ji, Xiangdong and Jin, Luchang and Li, Ruizi and Liu, Yu-Sheng and Yang, Yi-Bo and Zhang, Jian-Hui and Zhao, Yong (2018) Proton Isovector Helicity Distribution on the Lattice at Physical Pion Mass. PHYSICAL REVIEW LETTERS, 121 (24): 242003. ISSN 0031-9007, 1079-7114
Full text not available from this repository. (Request a copy)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-z is an element of {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, Delta(u) over bar (x) > Delta(d) over bar (x).
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Oct 2019 06:34 |
| Last Modified: | 04 Oct 2019 06:34 |
| URI: | https://pred.uni-regensburg.de/id/eprint/13355 |
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