Speaker
Description
E1039/SpinQuest is a polarized fixed-target Drell-Yan experiment using the 120 GeV proton beam from the Main Injector at Fermilab. The primary goal of SpinQuest is to measure the Sivers asymmetries, aiming to shed light on the fundamental question, “Do the light sea quarks contribute to the intrinsic spin of the nucleon via their orbital angular momentum?”. The Sivers asymmetry was first introduced to explain the unexpected, significant, transverse, single-spin asymmetries observed in the hadron-scattering. The Sivers functions for $u$ and $d$ quarks have been measured and found to be similar in size but with the opposite sign, but there are no data available yet for the sea quarks Sivers functions. SpinQuest will determine the $\bar{u}$ and $\bar{d}$ Sivers asymmetries in Drell-Yan using the transversely polarized proton and deuteron targets for the first time. The overview of SpinQuest, including the recent progress toward physics data taking, will be presented.
