  Over the past several years, parton distribution functions (PDFs) have become
more precise. However there are still kinematic regions where more data are
needed to help constrain global PDF extractions, such as the ratio of the sea
quark distributions $\bar{d}$/$\bar{u}$ near the valence region. Furthermore,
current measurements appear to suggest different high-$x$ behaviors of this
ratio. The $W$ cross section ratio ($W^+$/$W^-$) is sensitive to the
unpolarized quark distributions at large $Q^2$ set by the $W$ mass. Such a
measurement can be used to help constrain the $\bar{d}$/$\bar{u}$ ratio. The
STAR experiment at RHIC is well equipped to measure the leptonic decays of $W$
bosons, in the mid-pseudorapdity range $\left(|\eta| \leq 1 \right)$, produced
in proton-proton collisions at $\sqrt{s}$ = 500/510 GeV. At these kinematics
STAR is sensitive to quark distributions near $x$ of 0.16. STAR can also
measure $W^+$/$W^-$ in a more forward region ranging from 1.0 $< \eta <$1.5,
which extends the sea quark sensitivity to higher $x$. RHIC runs from 2011
through 2013 have collected about 350 pb$^{-1}$ of integrated luminosity, and
an additional 350 pb$^{-1}$ from the 2017 run. These proceedings will present
preliminary results of the 2011-2013 $W^+$/$W^-$ cross section ratio
measurements. Additionally, the $W/Z$ cross section ratio, differential and
total $W$ and $Z$ cross sections are presented.
