PoS - Proceedings of Science
Volume 380 - Particles and Nuclei International Conference 2021 (PANIC2021) - QCD, spin physics and chiral dynamics
Dimuon production with a transversely-polarized target in pion-induced collisions at COMPASS
A. Townsend*  on behalf of the COMPASS Collaboration
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Pre-published on: March 16, 2022
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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.
DOI: https://doi.org/10.22323/1.380.0375
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