Update on transverse-spin azimuthal asymmetries in single-hadron SIDIS on transversely polarised deuterons at COMPASS
Over the years, the COMPASS experiment at CERN has pursued an extensive SIDIS programme aimed at a comprehensive understanding of the structure of the nucleon, using a high-energy muon beam and polarised targets. Within this programme, measurements with a transversely polarised deuteron target were performed in 2022 using the 160 GeV/c muon beam. In single-hadron SIDIS on such a target, eight transverse-spin-dependent azimuthal asymmetries arise, providing sensitivity to several transverse-momentum-dependent parton distribution functions and to subleading-twist partonic correlations. We report the simultaneous extraction of all eight asymmetries from the complete 2022 deuteron sample. The Collins and Sivers asymmetries, previously presented using about 70% of the 2022 statistics, are updated with the full sample and found consistent with the earlier result, while the six remaining asymmetries are presented for the first time with the full 2022 statistics. Combined with the existing proton results, these measurements complete a comprehensive COMPASS programme on transverse-spin effects in SIDIS, providing essential input for global analyses.