Measurement of the longitudinal spin asymmetries for weak boson production in 
proton-proton collisions at sqrt{s} = 510 GeV

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

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Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at sqrt{s} = 510 GeV

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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Citation

STAR Collaboration, Adam, J., Schmitz, N., Seyboth, P., & et al. (2019). Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at sqrt{s} = 510 GeV. Physical Review D, 99, 051102. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2019-289.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D6D7-7

Abstract

We report new STAR measurements of the single-spin asymmetries $A_L$ for $W^+$ and $W^-$ bosons produced in polarized proton--proton collisions at $\sqrt{s}$ = 510 GeV as a function of the decay-positron and decay-electron pseudorapidity. The data were obtained in 2013 and correspond to an integrated luminosity of 250 pb$^{-1}$. The results are combined with previous results obtained with 86 pb$^{-1}$. A comparison with theoretical expectations based on polarized lepton-nucleon deep-inelastic scattering and prior polarized proton--proton data suggests a difference between the $\bar{u}$ and $\bar{d}$ quark helicity distributions for $0.05 < x < 0.25$. In addition, we report new results for the double-spin asymmetries $A_{LL}$ for $W^\pm$, as well as $A_L$ for $Z/\gamma^*$ production and subsequent decay into electron--positron pairs.