Angular Distributions of Pion-induced Drell–Yan Production

The angular distributions of unpolarized pion-induced Drell–Yan process are important information from which we explore both perturbative and non-perturbative QCD effects. We measure the Drell–Yan production from a 190 GeV \(\pi ^{ - }\) beam interacting with NH$_3$ and W targets in the COMPASS experiment at CERN. We present the estimated statistical uncertainty of unpolarized azimuthal asymmetries (\(\lambda \), \(\mu \), \(\nu \)) in the pion-induced Drell–Yan process from the data taken in 2015 in comparison with results published by the past NA10 and E615 experiments.