A lattice calculation of parton distributions
Date
2016Publisher
Proceedings of Science (PoS)Source
Proceedings of Science24th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2016
Volume
11-15-April-2016Google Scholar check
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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.