XXVIII International Workshop on Deep-Inelastic Scattering and Related Subjects

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

15 Apr 2021, 11:30

20m

Virtual (Stony Brook, NY)

Contributed Talk Structure Functions and Parton Densities Structure function and parton densities

Speaker

Jae Nam (Temple University)

Description

While the unpolarized valence quark ($d$ and $u$) distributions are well determined from DIS experiments, the sea quark counterparts, $\overline{d}$ and $\overline{u}$, are much less constrained, in particular, near the valence region. Measurements of $W^{+}/W^{-}$ production ratio in $pp$ collider experiments, such as the STAR experiment at RHIC, are sensitive to the $\overline{d}/\overline{u}$ ratio at leading order at a large $Q^2$ set by the $W$ mass. This talk will discuss the recently published $W$ and $Z/{\gamma }^{\ast }$ cross section measurements via lepton-decay tagging, using the STAR $pp$ collision data at a center-of-mass energy of $\sqrt{s}=510\mathrm{GeV}$ collected during the years 2011-2013, corresponding to an integrated luminosity of $350{\mathrm{pb}}^{-1}$. A status update will be given on an analysis based on an additional data set at $\sqrt{s}=510\mathrm{GeV}$ collected in 2017, corresponding to an integrated luminosity of $350{\mathrm{pb}}^{-1}$.

Presentation materials

Nam_DIS2021_v11.pdf

Youtube Link