论文编号:
第一作者所在部门:
论文题目:	Proton Isovector Helicity Distribution on the Lattice at Physical Pion Mass
论文题目英文:
作者:	Lin, Huey-Wen; Chen, Jiunn-Wei; Ji, Xiangdong; Jin, Luchang; Li, Ruizi; Liu, Yu-Sheng; Yang, Yi-Bo; Zhang, Jian-Hui; Zhao, Yong
论文出处:
刊物名称:	PHYSICAL REVIEW LETTERS
年:	2018
卷:	121
期:	24
页:	242003
联系作者:	Yang, YB (reprint author)
收录类别:
影响因子:
摘要:	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).
英文摘要:
外单位作者单位:
备注: