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07 February 2025

» arxiv » 1609.0172

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A Lattice Calculation of Parton Distributions
Constantia Alexandrou ; Krzysztof Cichy ; Kyriakos Hadjiyiannakou ; Karl Jansen ; Fernanda Steffens ; Christian Wiese ;
Date:	1 Sep 2016
Abstract:	We present results for the $x$ dependence of the unpolarized, helicity, and transversity isovector quark distributions in the proton using lattice QCD, employing the method of quasi-distributions proposed by Ji in 2013. Compared to a previous calculation by us, the errors are reduced by a factor of about 2.5. Moreover, we present our first results for the polarized sector of the proton, which indicate an asymmetry in the proton sea in favor of the $u$ antiquarks for the case of helicity distributions, and an asymmetry in favor of the $d$ antiquarks for the case of transversity distributions.
Source:	arXiv, 1609.0172
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