Speaker
Description
The COMPASS experiment at CERN has carried out an extensive SIDIS programme using a high-energy muon beam and polarised targets to investigate the transverse spin structure of the nucleon. In 2022, COMPASS collected data with a 160 GeV/$c$ muon beam and a transversely polarised deuteron target, complementing earlier measurements performed with a transversely polarised proton target. In SIDIS, the transverse-spin structure of the nucleon manifests itself through eight target-transverse-spin-dependent azimuthal asymmetries, providing access to different transverse-momentum-dependent parton distribution functions that encode distinct correlations between the parton transverse momentum, the nucleon transverse spin, and the parton spin. COMPASS extracts all eight asymmetries simultaneously from the same data set. We present recent updates on transverse-spin-dependent azimuthal asymmetries in single-hadron production, with particular emphasis on the Collins and Sivers effects. Together with the proton data, these results provide a comprehensive COMPASS data set on transverse-spin effects in SIDIS and offer essential input for global analyses.
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