Dimuon production with a transversely-polarized target in pion-induced collisions at COMPASS
March 16, 2022
The COMPASS experiment, located in the North Area of CERN, has the study of nucleon structure as one of its primary physics goals. In 2015 and 2018, COMPASS collected Drell-Yan and J/$\psi$ production data from the collisions of a 190 GeV $\pi^-$ beam with a transversely-polarized proton target and a tungsten target. Dimuon angular distributions provide valuable information about the transverse momentum dependent parton distribution functions (TMD PDFs) of the nucleon. Transverse-spin dependent azimuthal asymmetries (TSAs) are of particular interest because they can be used to test the predicted sign change of the Sivers TMD PDF when measured in Drell-Yan compared to semi-inclusive deep inelastic scattering. Additionally, TSAs in J/$\psi$ production may give access to gluon TMD PDFs and also improve our understanding of the charmonium production mechanism.
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