[Theory-seminars] Theory Seminar Monday (remote) - Luca Maxia

[Zheng-Yang Li]

Dear all,

On Monday, April 7th, 2025 at 1:00PM EDT, we will have a virtual seminar given by Luca Maxia of Laboratoire de Physique Théorique et Hautes Energies on the following Zoom link:

https://jlab-org.zoomgov.com/j/1618582025?pwd=HPpbhG5cVhyCdhK8oDjH9ASKbnFc6v.1

Although it’s not an in-person seminar, you can also join your colleagues for a remote streaming of the seminar in CEBAF Center F224-225.

Please see below for the title and abstract.

Theory Seminar: April 7th, 1pm EDT (virtual)

Speaker: Luca Maxia (LPTHE Paris)

Title: The impact of the TMD-ShF in J/ψ production at the EIC


Abstract: In contrast with the quark counterparts, gluon distributions that include transverse momentum and spin effects are still poorly known. Although Higgs production is a valuable playground to access them, it provides information mostly on the high energy region. Hence, to probe lower energies, one can study processes that involve the production of quarkonia, in particular J/ψ. In this regard, the EIC 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 factorization to describe J/ψ production, especially at low transverse momentum. 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, for instance, 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/ψ yields in SIDIS at the EIC. I will therefore first introduce this TMD quantity, highlighting the discrepancies between different works in the literature. 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/ψ cross section.

See you on Monday.

Best regards,

Joe, Zheng-Yang, Gloria and Adam
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