On the inclusive production of $J/\psi$ at the EIC in a TMD framework

par Luca Maxia (LPTHE, Sorbonne Université)

mercredi 26 nov. 2025, 11:00 → 13:00 Europe/Paris

100/2-A201 - Salle A201 (IJCLab)

In contrast with the quark counterparts, gluon distributions that include transverse momentum and spin effects are still poorly known. It is therefore important to identify observables sensitive to gluons. A proper framework to investigate these distributions is then the transverse momentum dependent (TMD) factorization. As a potential source of data to probe gluon TMDs, Higgs production is a valuable playground, but it is mostly sensitive to the high energy region. Thus, complementary information could in principle be achieved by investigating lower energy states, including quarkonia (and especially $J/\psi$). In this regard, the electron-ion collider is expected to have a crucial role in the relatively near future. However, to single out information about the initial state, it is first necessary to understand the behavior of the final state. This, in turn, requires the adoption of the proper TMD factorization which includes quarkonium formation. Recent developments have demonstrated that a novel transverse momentum dependent (TMD) quantity must be introduced: the TMD shape function (TMD-ShF). The function can be seen as a generalization of the long-distance matrix elements (LDME) that characterize the nonrelativistic QCD (NRQCD) approach. In this talk, I aim to illustrate the impact of the TMD-ShF on $J/\psi$ yields in SIDIS at the EIC. I will therefore first introduce this TMD quantity. I will then combine the TMD expression with the collinear one to obtain predictions valid at all transverse momenta. Finally, I will present numerical results based on this framework to quantify the expected impact of the TMD-ShF on $J/\psi$ cross section and asymmetries.