Seminarium Fizyki Wielkich Energii

After nearly 60 years of extensive experimental and theoretical studies, several aspects of the nucleon structure are still poorly known. While main efforts focuse on its collinear structure, measurements of transverse parton momenta are scarce and their analysis complicated.They involve measuring cross-section asymmetries in reactions like semi-inclusive deep inelastic scattering or Drell-Yan processes.In 2015 and 2018 the COMPASS Collaboration at CERN performed measurements of the Drell-Yan process π−p → μ+μ−X at 190 GeV/c pion beam and transversely polarised NH3 target. This presentation covers a description of the measurement of Transverse Spin Asymmetries in the Drell-Yan process, and in particular of a novel approach, in contrast to the conventional one, where the asymmetries are weighted by powers of a transverse momentum of the dimuon system with respect to the beam.This presentation is an extended version of a talk given on behalf of the COMPASS Collaboration at the International Workshop on Deep Inelastic Scattering and Related Subjects, DIS2024, in Grenoble (France), 8-14 April, 2024.