Speaker
Description
We present cross sections for the weak bosons measured by the STAR experiment at
RHIC in unpolarized proton-proton collisions at $\sqrt{s}$ = 500(510) GeV. The results combine data from run 2011, 2012, and 2013, corresponding to an integrated luminosity of 350~$pb^{-1}$. The differential $Z^{0}$ cross section measured as a function of the boson's $p_{T}$, provides important constraints on the energy dependence of intrinsic transverse momentum effects of partons inside the proton. The $W^{+}/W^{-}$ cross-section ratio as function of the boson's rapidity, is sensitive to the non-pertubative $\bar{d}/\bar{u}$ distribution. The probed $x$ range ($0.1 < x < 0.3$) covered by our data naturally complements the phase space accessed at the LHC, providing critical input to global fits.
