Nucleon helicity and transversity parton distributions from lattice QCD

作者：Chen, Jiunn-Wei; Cohen, Saul D.; Ji, Xiangdong; Lin, Huey-Wen^*; Zhang, Jian-Hui

来源：Nuclear Physics B, 2016, 911: 246-273.

DOI：10.1016/j.nuclphysb.2016.07.033

• BOSON

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 pi approximate to 310 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.

• 出版日期2016-10
• 单位上海交通大学