SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 17: Heavy-Ion Collisions and QCD Phases IV

HK 17.2: Vortrag

Dienstag, 21. März 2023, 17:30–17:45, SCH/A315

Prompt and non-prompt J/ψ production as a function of multiplicity in pp collisions with ALICE — •Gauthier Legras for the ALICE Germany collaboration — Institut für Kernphysik, WWU Münster

J/ψ production involves a hard scale for the creation of the charm-anticharm pair, and a soft scale for its hadronization. Correlating it with the multiplicity, mainly determined by soft particle production processes, in small systems allows to investigate the interplay between hard and soft scales. However, a substantial part of the J/ψ, called non-prompt J/ψ, comes from the decay of open-beauty hadrons. Since open-beauty hadron production mechanism is different from the one for prompt J/ψ, it becomes necessary to disentangle the prompt contribution from the non-prompt one in order to know if the non-prompt fraction could impact the inclusive (prompt + non-prompt) distribution of J/ψ as a function of multiplicity.

This study aims at determining the fraction of non-prompt J/ψ as a function of multiplicity in pp collisions at √s = 13 TeV, through its decay of J/ψ to an electron-positron pair at midrapidity. The fraction is determined from the study of displaced J/ψ decay vertices, using a Boosted Decision Tree algorithm for the identification of the J/ψ and its classification.