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Forward Neutral Pion Transverse Single Spin Asymmetries in p+p Collisions at \sqrt{s}=200 GeV

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arxiv 0801.2990 v2 pith:UDQQWHDB submitted 2008-01-21 hep-ex

STAR Collaboration: B.I. Abelev , et al This is my paper · ORCID
classification hep-ex
keywords dependencespintransverseasymmetriescalculationscollisionsmeasurementsproton
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We report precision measurements of the Feynman-x dependence, and first measurements of the transverse momentum dependence, of transverse single spin asymmetries for the production of \pi^0 mesons from polarized proton collisions at \sqrt{s}=200 GeV. The x_F dependence of the results is in fair agreement with perturbative QCD model calculations that identify orbital motion of quarks and gluons within the proton as the origin of the spin effects. Results for the p_T dependence at fixed x_F are not consistent with pQCD-based calculations.

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  1. Single spin asymmetry in forward $pA$ collisions from Pomeron-Odderon interference

    hep-ph 2025-01 conditional novelty 7.0 of 10

    A new Pomeron-Odderon interference term in the hybrid CGC framework yields a percent-level transverse single spin asymmetry in forward pA collisions, with a characteristic sign-changing node at the saturation scale.

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