English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Over the past several years, parton distribution functions (PDFs) have becomemore precise. However there are still kinematic regions where more data areneeded to help constrain global PDF extractions, such as the ratio of the seaquark distributions $\bar{d}$/$\bar{u}$ near the valence region. Furthermore,current measurements appear to suggest different high-$x$ behaviors of thisratio. The $W$ cross section ratio ($W^+$/$W^-$) is sensitive to theunpolarized quark distributions at large $Q^2$ set by the $W$ mass. Such ameasurement can be used to help constrain the $\bar{d}$/$\bar{u}$ ratio. TheSTAR experiment at RHIC is well equipped to measure the leptonic decays of $W$bosons, in the mid-pseudorapdity range $\left(|\eta| \leq 1 \right)$, producedin proton-proton collisions at $\sqrt{s}$ = 500/510 GeV. At these kinematicsSTAR is sensitive to quark distributions near $x$ of 0.16. STAR can alsomeasure $W^+$/$W^-$ in a more forward region ranging from 1.0 $< \eta <$1.5,which extends the sea quark sensitivity to higher $x$. RHIC runs from 2011through 2013 have collected about 350 pb$^{-1}$ of integrated luminosity, andan additional 350 pb$^{-1}$ from the 2017 run. These proceedings will presentpreliminary results of the 2011-2013 $W^+$/$W^-$ cross section ratiomeasurements. Additionally, the $W/Z$ cross section ratio, differential andtotal $W$ and $Z$ cross sections are presented.

Constraining the Sea Quark Distributions Through W$^\pm$ Cross Section Ratio Measurements at STAR