Speaker
Description
The behavior of the valence quark PDF in the pion as the momentum fraction approaches 1 has been a long standing debate. The Jefferson Lab Angular Momentum (JAM) collaboration has tackled this problem by including both the historical fixed-target Drell-Yan (DY) data and the leading neutron (LN) electroproduction data from HERA in a simultaneous global QCD analysis. We have also introduced a systematic study of threshold resummation in the DY hard coefficients as well as the inclusion of reduced Ioffe time pseudo-distributions calculated from lattice data. Future measurements such as the 12 GeV JLab tagged deep inelastic scattering (TDIS) experiment as well as the complementary experiment at the anticipated electron-ion collider (EIC) may also be sensitive to the large momentum fraction behavior. In this talk I summarize the current JAM results as well as outline the potential impacts from the future facilities.
