Sivers asymmetry extracted in SIDIS at the hard scale of the Drell-Yan process at COMPASS

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.

arXiv comment13 pages, 6 figures

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Cited by in corpus (30)

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• Spin Orbit Correlations and the Structure of the Nucleon
• Investigating the Transverse Single Spin Asymmetry in the Inelastic $J/\Psi$ photoproduction in $p^{\uparrow }p$ and $p^{\uparrow }A$ collisions
• Effect of sea quarks on single-spin asymmetries $A_N^{W^{\pm }}$ in transversely polarized pp collisions at RHIC
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• Mapping the internal structure of hadrons through color and spin effects
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