Speaker
Description
We study the Sivers azimuthal asymmetry for $J/\psi$ production in semi-inclusive deeply inelastic scattering, with the aim of gaining information on the poorly known gluon Sivers function. We concentrate on the $J/\psi$ low transverse momentum region, adopting the transverse-momentum dependent generalized parton model (GPM), and its color gauge invariant extension (CGI-GPM), which includes final state interactions at leading order. We consider the nonrelativistic QCD (NRQCD) scheme for the quarkonium formation mechanism. We compare our results for unpolarized cross sections and the Sivers asymmetry with available data, respectively from HERA and COMPASS, giving estimates for the asymmetry in the kinematical regime of the future Electron-Ion Collider (EIC).
