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While the unpolarized parton distribution functions of the valence quarks($d$ and $u$) are well determined from DIS experiments, the sea quarkcounterparts, $\bar{d}$ and $\bar{u}$, are much less constrained, inparticular, near the valence region. Measurements of $W^+/W^-$ production ratioin $pp$ collider experiments, such as the STAR experiment at RHIC, can probethe $\bar{d}/\bar{u}$ ratio at a large $Q^2$ set by the $W$ mass. Theseproceedings will discuss recent results of $W$ and $Z$ cross-sectionmeasurements using the STAR $pp$ collision data at a center-of-mass energy of$\sqrt{s} = 500/510\;\mathrm{GeV}$ collected in 2011, 2012, 2013 and 2017.

Measurements of $W$ and $Z/\gamma^*$ cross sections and their ratios in $pp$ collisions at STAR