May 23 – 27, 2022
Almo Collegio Borromeo, Pavia, Italy
Europe/Rome timezone

Recent results from COMPASS Drell-Yan program

May 27, 2022, 11:30 AM
20m
Almo Collegio Borromeo, Pavia, Italy

Almo Collegio Borromeo, Pavia, Italy

P.zza Borromeo 9 27100 Pavia Italy
Longer talk Plenary session

Speaker

Riccardo Longo (University of Illinois at Urbana-Champaign)

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.

Primary author

Riccardo Longo (University of Illinois at Urbana-Champaign)

Presentation materials