Speaker
Description
Recent works on pion structures through the JAM framework introduce both Drell-Yan (DY) and leading neutron (LN) electroproduction observables to constrain parton distribution functions (PDFs) in the pion. Extending to the transverse direction, we make use of low energy transverse momentum dependent DY data to extract pion transverse momentum dependent (TMD) PDFs. In these fixed target DY experiments, we additionally extract proton and nuclear TMDs. Using TMD factorization in the Collins, Soper, Sterman formalism, we also have access to dependence on the collinear PDF through the operator product expansion. Because of this, for the first time, we simultaneously analyzed TMD and collinear PDFs in the pion. Our results show a significant diRerence in the pion and proton TMDs, quantified by the first moment of the TMDs in transverse coordinate space. We indicate this diRerence comes from a nontrivial diRerence in the nonperturbative TMD structure.
