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Proton Isovector Helicity Distribution on the Lattice at Physical Pion Mass

Lin, Huey-Wen ; Chen, Jiunn-Wei ; Ji, Xiangdong ; Jin, Luchang ; Li, Ruizi ; Liu, Yu-Sheng ; Yang, Yi-Bo ; Zhang, Jian-Hui ; Zhao, Yong


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 ...


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