Gluon parton distribution of the pion from lattice QCD

We present the first determination of the x-dependent pion gluon distribution from lattice QCD using the pseudo-PDF approach. We use lattice ensembles with 2+1+1 flavors of highly improved staggered quarks (HISQ), generated by MILC Collaboration, at two lattice spacings a approximate to 0.12and 0.15 fm and three pion masses M-pi approximate to 220, 310 and 690 MeV. We use clover fermions for the valence action and momentum smearing to achieve pion boost momentum up to 2.29 GeV. We find that the dependence of the pion gluon parton distribution on lattice spacing and pion mass is mild. We compare our results from the lightest pion mass ensemble with the determination by JAM and xFitter global fits. (C) 2021 The Authors. Published by Elsevier B.V.

Automated summary

In this study, the x-dependent pion gluon distribution from lattice QCD using the pseudo-PDF approach is determined for the first time. The results show that the dependence of the pion gluon parton distribution on lattice spacing and pion mass is mild across different lattice spacings and pion masses. Comparisons with other global fits are also made to validate the findings.