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Lin, Huey-Wen; Chen, Jiunn-Wei; Ji, Xiangdong; Jin, Luchang; Li, Ruizi; Liu, Yu-Sheng; Yang, Yi-Bo; Zhang, Jian-Hui; Zhao, Yong (, Physical review letters)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 quasi-distributions at proton momenta $$P_z \in \{2.2, 2.6, 3.0\}$$~GeV on the lattice, and match them systematically to the physical parton distribution using large-momentum effective theory (LaMET). We reach an unprecedented precision through high statistics in simulations, large-momentum proton matrix elements, and control of excited-state contamination. The resulting distribution is in agreement within $$2\sigma$$ with the latest phenomenological analysis of the spin-dependent experimental data; in particular, $$\Delta \bar{u}(x)>\Delta \bar{d}(x)$$.more » « less
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Lin, Huey-Wen; Chen, Jiunn-Wei; Ji, Xiangdong; Jin, Luchang; Li, Ruizi; Liu, Yu-Sheng; Yang, Yi-Bo; Zhang, Jian-Hui; Zhao, Yong; Collaboration (, Physical Review Letters)
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Xia, Jingkai; Abdukerim, Abdusalam; Chen, Wei; Chen, Xun; Chen, Yunhua; Cui, Xiangyi; Fang, Deqing; Fu, Changbo; Giboni, Karl; Giuliani, Franco; et al (, Physics Letters B)
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