Ponente
Abstract
In the last years a big progress has been made in the quark sector of transverse-momentum-dependent parton distribution functions (TMDs), which encode the 3D/spin structure of the nucleon. But the gluon sector is so far much less developed, due to the difficulty to cleanly probe gluons in high-energy processes.
A very promising way to probe them, but also challenging, is quarkonia production. However, a solid theoretical framework is still lacking.
In this talk I will present new developments towards a new formalism which, based on the effective field theory approach, allows to establish the needed factorization theorems to properly access gluon TMDs in quarkonia production.
I will discuss some interesting observables which can be measured at the LHC, as double quarkonium production, and at the future Electron-Ion Collider (EIC), as J/Psi leptoproduction.
