Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>510</mml:mn><mml:mtext></mml:mtext><mml:mtext></mml:mtext><mml:mi>GeV</mml:mi></mml:math>

2019 authors. Published by the American Physical Society. We report new STAR measurements of the single-spin asymmetries AL for W+ and W- bosons produced in polarized proton-proton collisions at 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 and d quark helicity distributions for 0.05

Adam, J., Adamczyk, L., Adams, J. R., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., ... Zyzak, M.

Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at s=510GeV Academic Article