Measurements of W and Z/γ^* cross sections and their ratios in p+p collisions 
at RHIC

STAR Collaboration,; Adam, J.; Schmitz, N.; Seyboth, P.; et al.,

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学術論文

Measurements of W and Z/γ^* cross sections and their ratios in p+p collisions at RHIC

MPS-Authors

STAR Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Adam, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Schmitz, N.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Seyboth, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

et al.,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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引用

STAR Collaboration, Adam, J., Schmitz, N., Seyboth, P., & et al., (2021). Measurements of W and Z/γ^* cross sections and their ratios in p+p collisions at RHIC. Physical Review D, 103, 012001. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2021-262.

引用: https://hdl.handle.net/21.11116/0000-000A-1A56-9

要旨

We report on the W and Z/\gamma^* differential and total cross sections as well as the W^+/W^- and $W^+ + W^-)/(Z/\gamma^*) cross-section ratios measured by the STAR experiment at RHIC in p+p collisions at \sqrt{s} = 500 GeV and 510 GeV. The cross sections and their ratios are sensitive to quark and antiquark parton distribution functions. In particular, at leading order, the W cross-section ratio is sensitive to the \bar{d}/\bar{u} ratio. These measurements were taken at high Q^2 \sim M_W^2,M_Z^2 and can serve as input into global analyses to provide constraints on the sea quark distributions. The results presented here combine three STAR data sets from 2011, 2012, and 2013, accumulating an integrated luminosity of 350 pb^{-1}. We also assess the expected impact that our W^+/W^- cross-section ratios will have on various quark distributions, and find sensitivity to the \bar{u}-\bar{d} and \bar{d}/\bar{u} distributions.