Speaker
Description
We present recent results and future outlook for gluon parton distributions from lattice QCD, focusing primarily on the pion and nucleon gluon parton distribution functions (PDFs). The nucleon gluon PDF is a crucial input to the prediction of rare physics processes such as Higgs and $J/\psi$ production and beyond the standard model physics. The pion gluon PDF is expected to hold clues about the chiral symmetry breaking which gives rise to hadron mass. Obtaining good signal for the gluon PDFs can be challenging for both phenomenological and lattice studies due to limited experimental data and poor signal at long distances respectively. We discuss calculations of the proton and pion PDFs from the pseudo-PDF methodology at various lattice spacings and pion masses, with a continuum-physical extrapolation of the proton PDF. We present the results of a joint study with the JAM collaboration using lattice gluon data to constrain a global fit of the pion PDFs. We conclude with comments about current and future application of large momentum effective theory to the gluon PDF and new signal improvement techniques, which are expected to push towards a new generation of gluon distribution calculations from lattice QCD.
