COMPASS reports preliminary qT-weighted Drell-Yan transverse spin asymmetries from 2015 plus half of 2018 data, and extracts the first transverse moment of the pion Boer-Mulders TMD PDF.
Sivers effect in semi-inclusive DIS and in the Drell-Yan process
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abstract
The Sivers parton distribution has been predicted to obey a particular ``universality relation'', namely to have opposite sign in semi-inclusive deeply inelastic scattering (SIDIS) and the Drell-Yan process. We discuss how, on the basis of present HERMES data, this remarkable prediction of the QCD factorization approach to the description of single spin asymmetries related to the Sivers effect could be checked experimentally in future experiments at PAX and COMPASS.
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Measurement of $\mathbf{q_T}$-weighted transverse-spin-dependent azimuthal asymmetries at COMPASS
COMPASS reports preliminary qT-weighted Drell-Yan transverse spin asymmetries from 2015 plus half of 2018 data, and extracts the first transverse moment of the pion Boer-Mulders TMD PDF.