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The SeaQuest experiment is being carried out at Fermi National Accelerator Lab (FNAL) to investigate the nucleon structure with the Drell-Yan process. It utilizes the 120-GeV proton beam extracted from the FNAL Main Injector and targets of liquid hydrogen, liquid deuterium, carbon, iron and tungsten. The solid targets are used to measure the nuclear effects. This paper describes the flavor asymmetry of light anti-quark distributions in the proton (d/ū) and the angular distribution of Drell-Yan process. The Boer-Mulders function (h1⊥(x,k T)) can be derived from the size (ν) of cos 2ϕ modulation. SeaQuest finished the second data-taking period in August 2014. Preliminary results of d/ū and ν are reported.

Measurement of Boer-Mulders Function via Drell-Yan Process by SeaQuest Experiment at Fermilab