Investigating the Transverse Momentum Dependent Gluon Sivers Function in Quarkonium Production at pp Colliders

D'Alesio U.;Murgia F.;Pisano C.

2021-01-01

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Abstract

In this contribution, we will present a short overview of the transverse momentum dependent (TMD) approach as a tool for studying the 3-dimensional structure of hadrons in high-energy (un)polarized hadron collisions. We will then summarize the present status of a running research programme that aims at constraining the poorly known transverse momentum dependent gluon Sivers function, through the study of single spin asymmetries in quarkonium (mainly J / ψ), pion, and D-meson production in polarized proton-proton collisions at RHIC. Finally, we will shortly discuss perspectives for this field of research, emphasizing in particular its role in the physics programme of LHC in the fixed-target setup and NICA-SPD at JINR.