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A Lattice Calculation of Parton Distributions

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arxiv 1609.00172 v1 pith:O76U4O6C submitted 2016-09-01 hep-lat hep-ph

A Lattice Calculation of Parton Distributions

classification hep-lat hep-ph
keywords distributionsprotonantiquarksasymmetrycalculationcasefavorhelicity
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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