Nucleon helicity and transversity parton distributions from lattice QCD

DOI10.1016/J.NUCLPHYSB.2016.07.033zbMATH Open1346.81152arXiv1603.06664OpenAlexW2309199192MaRDI QIDQ318755

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Publication date: 5 October 2016

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Abstract: We present the first lattice-QCD calculation of the isovector polarized parton distribution functions (both helicity and transversity) using the large-momentum effective field theory (LaMET) approach for direct Bjorken-$x$ dependence. We first review the detailed steps of the procedure in the unpolarized case, then generalize to the helicity and transversity cases. We also derive a new mass-correction formulation for all three cases. We then compare the effects of each finite-momentum correction using lattice data calculated at $M_{p}iapprox310$ MeV. Finally, we discuss the implications of these results for the poorly known antiquark structure and predict the sea-flavor asymmetry in the transversely polarized nucleon.

Full work available at URL: https://arxiv.org/abs/1603.06664

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