Speaker
Description
Studies of the transverse-spin dependent azimuthal asymmetries in the Drell-Yan process permit to access the spin-dependent structure of the nucleon and in particular to test the limited universality of its transverse-momentum dependent parton distributions, which are known from deep inelastic scattering.
In 2015 and 2018 the COMPASS Collaboration at CERN performed measurements of the $\pi^-$p $\rightarrow \mu^+\mu^-$X reaction at 190 GeV/$c$ pion beam and transversely polarised NH$_3$ target. Results of the analysis will be presented and including those obtained with a novel approach where the asymmetries were weighted by powers of a transverse momentum of the dimuon system with respect to the beam. This approach overcomes the convolution over the intrinsic transverse momentum and opens an easy access to certain $k_{\rm T}^2$ moments of the transverse-momentum dependent parton distribution functions.
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