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Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at s=510 GeV
- Adam, J;
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- Ye, Z;
- Yi, L;
- Yip, K;
- Yoo, I-K;
- Zbroszczyk, H;
- Zha, W;
- Zhang, D;
- Zhang, J;
- Zhang, L;
- Zhang, S;
- Zhang, S;
- Zhang, XP;
- Zhang, Y;
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- Zhong, C;
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- Zyzak, M
- et al.
Published Web Location
https://doi.org/10.1103/physrevd.99.051102Abstract
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 ū and d quark helicity distributions for 0.05
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