Speaker
Description
The investigation of the nucleon spin structure via measurements of dimuons produced in the Drell-Yan process is one of the main goals of the phase-II research program of the COMPASS experiment (M2 beamline, SPS, CERN).
In 2015 and 2018, COMPASS performed Drell-Yan measurements using a 190 GeV/c $\pi^-$ beam impinging on a transversely polarized NH$_3$ target and on an unpolarized tungsten target. The measurement of the Sivers and other transverse-spin dependent azimuthal asymmetries in Drell-Yan provides a unique opportunity to test the QCD predicted (pseudo-)universality features of related transverse momentum dependent parton distribution functions. The angular coefficients $\lambda$, $\mu$ and $\nu$ that characterize the unpolarized Drell-Yan cross-section were also extracted from the data collected using the tungsten target. The results of this analysis provide input to study various perturbative and non-perturbative QCD effects.
In this talk, recent Drell-Yan results from COMPASS will be presented along with prospects for ongoing studies.
