Orateur
Description
Pion-induced Drell-Yan muon-pair production is one of the key processes providing information on the structure of the $\pi$ meson. In this channel, the world data set is limitted to the cross-section measurements performed by the NA10 and E615 experiments more than 30 years ago. In 2015 and 2018, the COMPASS experiment at CERN collected data sensitive to the Drell-Yan process using a 190 GeV negative pion beam scattering off an NH3 target and two nuclear targets: aluminium and tungsten. The recent results of the differential cross sections of Drell-Yan muon-pair production measured by the COMPASS Collaboration will be presented. The kinematic domain is restricted to dimuon invariant masses between 4.3 and 8.5 GeV/$c^2$ and spans the Feynman-x region from -0.2 to 0.9 and transverse momenta up to 3.6 GeV/$c$. The results are a valuable input for constraining the collinear and transverse momentum dependent parton distribution functions of the pion.
