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

2021/08/02 by Jae Nam, Nam, Jae
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Nuclear Experiment (nucl-ex) #hep-ex #nucl-ex

paper · pdf · doi:10.48550/arxiv.2108.01029

Proceedings for the XXVIII International Workshop on Deep-Inelastic Scattering and Related Subjects Comments: changed the aspect ratio of the picture on the right panel of Figure 3 as per a request made by the editor (Feb 14, 2022)

arxiv created 2022/02/14 · arxiv updated 2022/02/15

Abstract

While the unpolarized parton distribution functions of the valence quarks (d and u) are well determined from DIS experiments, the sea quark counterparts, d and 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, can probe the d/u ratio at a large Q² set by the W mass. These proceedings will discuss recent results of W and Z cross-section measurements using the STAR pp collision data at a center-of-mass energy of √(s) = 500/510 GeV collected in 2011, 2012, 2013 and 2017.

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