3–7 juin 2024
Université de Strasbourg / Palais de la Musique et des Congrès
Fuseau horaire Europe/Paris

Probing a new regime of ultra-dense gluonic matter using high-energy photons with the CMS experiment

4 juin 2024, 16:50
20m
Room Rome (Palais de la Musique et des Congrès)

Room Rome

Palais de la Musique et des Congrès

Talk Heavy-Flavours & Quarkonia Track2-HF&Q

Orateur

Pranjal Verma

Description

In ultraperipheral collisions (UPCs) involving relativistic heavy ions, the production of heavy-flavor coherent vector mesons through photon-nuclear interactions is a key focus due to its direct sensitivity to the nuclear gluon density. Experimental measurements, however, face a two-way ambiguity as each of the symmetric UPC nuclei can act as both a photon-emitter projectile and a target. This ambiguity hinders the separation of contributions from high- and low-energy photon-nucleus interactions, restricting our ability to probe the extremely small-(x) regime where nonlinear QCD effects are anticipated. The presentation will unveil the measurement of coherent heavy quarkonium photoproduction, addressing the two-way ambiguity by employing a forward neutron tagging technique in UPC PbPb collisions at 5.02 TeV. Overall these studied focus on the dominance of gluons in nuclear matter probed at higher energies.

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