Final SeaQuest Results on the Flavor Asymmetry of the Proton Light-Quark Sea with Proton-Induced Drell-Yan Process

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The Fermilab E906/SeaQuest collaboration performed measurements of the Drell-Yan process using 120 GeV proton beams bombarding liquid hydrogen and liquid deuterium targets. A combined analysis of all collected data was performed to obtain the final results for the σpd/2σₚₚ Drell-Yan cross section ratio covering the kinematic region of 0.13<x<0.45. The x dependencies of d[over ¯](x)/u[over ¯](x) and d[over ¯](x)-u[over ¯](x) are extracted from these cross section ratios. It is found that d[over ¯](x) is greater than u[over ¯](x) over the entire measured x range, with improved statistical accuracy compared to previous measurements. The new results on d[over ¯](x)/u[over ¯](x) and d[over ¯](x)-u[over ¯](x) are compared to various parton distribution functions and theoretical calculations.