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[en] The COMPASS Collaboration measured Transverse Spin Asymmetries in the Drell-Yan process. The measurement was done with a 190 GeV/c negative pion beam and a transversely polarized ammonia target. The data were taken during 2015 and 2018. The measured asymmetries, related to Transverse Momentum Dependent Parton Distribution Functions will be presented with a special focus on the Sivers asymmetry, which is related to the orbital angular momenta of the quarks inside the nucleon. The Sivers function was also accessed in COMPASS Semi-Inclusive Deep Inelastic Scattering measurement and is theoretically predicted to be of opposite sign compared to that in Drell-Yan. The results from the 2015 data analysis, which will be presented, favor the sign change scenario. The joint analysis of 2015 and 2018 Drell-Yan data will improve the experimental uncertainty. (author)
Source
Dote, Akinobu; Morimatsu, Osamu (High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki (Japan)) (eds.); Goto, Yuji (ed.) (RIKEN, Wako, Saitama (Japan)) (and others); [780 p.]; ISBN 978-4-89027-136-8; 
; 2019; p. 021010.1-021010.4; QNP2018: 8. international conference on quarks and nuclear physics; Tsukuba, Ibaraki (Japan); 13-17 Nov 2018; Available from https://doi.org/10.7566/JPSCP.26.021010; 5 refs., 5 figs.
; 2019; p. 021010.1-021010.4; QNP2018: 8. international conference on quarks and nuclear physics; Tsukuba, Ibaraki (Japan); 13-17 Nov 2018; Available from https://doi.org/10.7566/JPSCP.26.021010; 5 refs., 5 figs.