Speaker
Description
We present the status for the measurement of cross sections of weak boson production as a function of the boson's kinematics, by the STAR experiment at RHIC. Results combine data from unpolarized p+p collisions at $\sqrt{s}$ = 500 and 510 GeV collected during the 2011, 2012, 2013, and 2017 runs, corresponding to an integrated luminosity of 700 pb$^{-1}$. The differential $Z^{0}$ cross section, measured as a function of the boson's $p_{T}$, provides important constraints on the energy scale dependence of transverse momentum distributions of partons inside the proton. The $W^{+}/W^{-}$ cross-section ratio as a function of the boson's rapidity is sensitive to the non-pertubative $\bar{d}/\bar{u}$ distribution. The momentum fraction range ($0.1 < x < 0.3$) covered by these measurements naturally complements the phase space accessed at the LHC, providing critical inputs to global fits.
