Speaker
Description
Over the last few decades, three-dimensional imaging of the nucleon, such as the transverse momentum dependent parton distribution functions (TMDs), has received much attention to better understand the structure of the nucleon. The Boer-Mulders function is one of the TMDs that represents the correlation between the transverse spin and the transverse momentum of the quark. It is suggested that the Boer-Mulders function leads to a cos2ϕ modulation in the azimuthal angular distribution of the pion induced Drell-Yan process. This suggestion was later found to be consistent with the fixed-target Drell-Yan experiment E866 using the 800 GeV proton beam from the Fermilab Main Injector. Now the azimuthal angular distributions of leptons in the Drell-Yan process are regarded as an important tool for accessing TMDs.
Compared to the E866 results, SeaQuest will extend the angular distribution to a larger x region using the 120 GeV proton beam on a LH2 target. In this talk, we will report the preliminary SeaQuest results of ν with 40% of the full SeaQuest data collected.
