Spin physics in polarised Drell-Yan processes at COMPASS

The Drell-Yan process can be used to access Transverse Momentum Dependent Parton Distribution Functions (TMD PDFs), such as Boer-Mulders function, Sivers function and Transversity functions, providing complementary informations to what is known from Semi Inclusive Deep Inelastic Scattering (SIDIS) data. The COMPASS experiment offers the possibility to extract TMD PDFs from Drell-Yan data, using its spectrometer and its unique transversely polarisable target.