Speaker
Description
We present our recent results for the gluon momentum fraction of the nucleon using lattice quantum chromodynamics (QCD), with a nonperturbative renormalization technique based on the gradient flow. Various techniques are used to reduce statistical and systematic uncertainties. The variational method is used to reduce excited-state contamination. Distillation is employed to reduce the costs arising from a large operator basis. To reduce systematic uncertainties, we apply Bayesian model averaging to all fit procedures. The momentum fraction is computed on gradient-flowed ensembles. We apply matching coefficients to the flow-time dependent lattice results to recover the gluon momentum fraction in the MS-bar scheme at 2 GeV. Our final result is $\langle x \rangle_g(\mu = 2 \; \mathrm{GeV}) = 0.482(35)$ computed at a single lattice spacing and pion mass.