[CFNS seminar] Advances in quark transverse dynamics in the proton from Lattice QCD

by Michael Engelhardt (New Mexico State University)

Thursday 20 Feb 2020, 16:00 → 17:00 US/Eastern

Room 2-38 (CFNS seminar room)

Recent progress in an ongoing program of evaluating transverse
momentum-dependent (TMD) observables in the proton within Lattice QCD
is reviewed. These lattice calculations are based on a definition of
TMDs through hadronic matrix elements of quark bilocal operators,
including an appropriate gauge connection between the quarks.
Results presented include data on the Sivers and Boer-Mulders effects,
highlighting the decisive role of the gauge connection in encoding
information about the struck quark in a deep inelastic scattering
process. First lattice data obtained directly at the physical pion
mass are exhibited, and an exploratory outlook on extracting the
dependence of the Sivers shift on the quark momentum fraction x
is given.