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We present updates to a recent CTEQ-Jefferson Lab (CJ) global analysis ofparton distribution functions with a new set of electroweak data that provideunique access to quark flavor separation in the proton. In particular, recent$W$ and $Z$ boson measurements from the STAR experiment at RHIC put additionalconstraints on light quarks and antiquarks near the valence regime. The newmeasurement of the Drell-Yan lepton pair production ratio in $p+p$ and $p+d$collisions by the SeaQuest experiment at Fermilab extends the large-$x$coverage of the previous E866 experiment and sheds new light on the lightantiquarks distribution. In this report, the impact of these new data sets onparton distribution functions will be presented with emphasis given to theflavor asymmetry of the light antiquark sea at large values of the partonmomentum $x$.

CJ15 global PDF analysis with new electroweak data from the STAR and SeaQuest experiments