COMPASS combines 2015 and partial 2018 Drell-Yan data to measure five transverse-spin azimuthal asymmetries, finding a Sivers asymmetry consistent with the QCD sign-change prediction at about one standard deviation.
Sivers asymmetry extracted in SIDIS at the hard scale of the Drell-Yan process at COMPASS
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abstract
Proton transverse-spin azimuthal asymmetries are extracted from the COMPASS 2010 semi-inclusive hadron measurements in deep inelastic muon-nucleon scattering in those four regions of the photon virtuality $Q^2$, which correspond to the four regions of the di-muon mass $\sqrt{Q^2}$ used in the ongoing analysis of the COMPASS Drell-Yan measurements. This allows for a future direct comparison of the nucleon transverse-momentum-dependent parton distribution functions extracted from these two alternative measurements. Various two-dimensional kinematic dependences are presented for the azimuthal asymmetries induced by the Sivers transverse-momentum-dependent parton distribution function. The integrated Sivers asymmetries are found to be positive with an accuracy that appears to be sufficient to test the sign change of the Sivers function predicted by Quantum Chromodynamics.
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Transversely polarized Drell-Yan measurements at COMPASS
COMPASS combines 2015 and partial 2018 Drell-Yan data to measure five transverse-spin azimuthal asymmetries, finding a Sivers asymmetry consistent with the QCD sign-change prediction at about one standard deviation.