Speaker
Description
The gluon momentum fraction of the nucleon is a key measure of hadronic structure. It characterises the average hadron momentum carried by gluons and is directly related to the energy-momentum tensor, which is central to the origin of mass in quantum chromodynamics (QCD). I report on a recent calculation [arXiv:2602.14260] by the HadStruc Collaboration that uses the gradient flow as a novel nonperturbative renormalisation procedure to extract the gluon momentum fraction from lattice QCD. We determined the gluon momentum fraction on a single Wilson-clover ensemble using Nf = 2+1 flavors with pion mass 358 MeV and lattice spacing 0.094 fm. Our final result, evaluated at a scale of 2 GeV in the MS-bar scheme, is <x>_g = 0.482(35), where we quote only statistical uncertainties.