Polarized Drell-Yan at SpinQuest/ Fermilab E1039

The SpinQuest (Fermilab E1039) experiment will measure an azimuthal asymmetry in the Drell-Yan production of $\mu+$ $\mu-$ pairs from 120 GeV/c proton interactions with polarized nucleons to extract the Sivers function for $\bar{u}$ and $\bar{d}$. A nonzero asymmetry would be “smoking gun” evidence for orbital angular momentum of the light sea-quarks: a possible contributor to the proton’s spin. Measurements of a transverse single spin asymmetry in the J/$\Psi$ background would also serve to constrain the gluon Sivers function over $0.05 < x_{target} < 0.2$. The polarized target, developed by Los Alamos National Labs and University of Virginia, uses Dynamic Nuclear Polarization to reach an average proton target polarization over 80$\%$. After a brief introduction to the E1039 experimental apparatus and target, I will discuss upcoming physics at SpinQuest.