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Measurement of the transverse single-spin asymmetry in $p^\uparrow+p \to W^{\pm}/Z^0$ at RHIC

The collaboration
Phys.Rev.Lett. 116 (2016) 132301, 2016

Abstract (data abstract)
BNL-RHIC. We present the measurement of the transverse single-spin asymmetry of weak boson production in transversely polarized proton-proton collisions at $\sqrt{s} = 500~\text{GeV}$ by the STAR experiment at RHIC. The measured observable is sensitive to the Sivers function, one of the transverse momentum dependent parton distribution functions, which is predicted to have the opposite sign in proton-proton collisions from that observed in deep inelastic lepton-proton scattering. These data provide the first experimental investigation of the non-universality of the Sivers function, fundamental to our understanding of QCD.

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Data from Figure 1

10.17182/hepdata.73263.v1/t1

$P_{T}$ Recoil distribution of events simulated with PYTHIA 6.4 and reconstructed before and after the boson's PT correction has been...

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Data from Figure 2 (Upper)

10.17182/hepdata.73263.v1/t2

Estimated background contributions for the $W^+ -> ev$ data yields.

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Data from Figure 2 (lower)

10.17182/hepdata.73263.v1/t3

Estimated background contributions for the $W^- -> ev$ data yields.

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Data from Figure 3

10.17182/hepdata.73263.v1/t4

The amplitude of the transverse single-spin asymmetry for $W^{+-}$ boson production as a function of $P_T^W$, in the |$y^W$| <...

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Data from Figure 3

10.17182/hepdata.73263.v1/t5

The amplitude of the transverse single-spin asymmetry for $W^{+-}$ boson production as a function of $y^W$, in the 0.5 GeV/c...

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Data from Figure 3

10.17182/hepdata.73263.v1/t6

The amplitude of the transverse single-spin asymmetry for $Z^0$ boson production, measured by STAR in proton+proton collisions at $\sqrt{s}=500$ GeV...

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