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

Abstract

While the unpolarized parton distribution functions of the valence quarks (dd and uu) are well determined from DIS experiments, the sea quark counterparts, \bar{d}d‾ and \bar{u}u‾, are much less constrained, in particular, near the valence region. Measurements of W^+/W^-W+/W− production ratio in pppp collider experiments, such as the STAR experiment at RHIC, can probe the \bar{d}/\bar{u}d‾/u‾ ratio at a large Q^2Q2 set by the WW mass. These proceedings will discuss recent results of WW and ZZ cross-section measurements using the STAR pppp collision data at a center-of-mass energy of \sqrt{s} = 500/510\;\mathrm{GeV}s=500/510GeV collected in 2011, 2012, 2013 and 2017.