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HK: Fachverband Physik der Hadronen und Kerne

HK 32: Heavy-Ion Collisions and QCD Phases VI

HK 32.4: Talk

Tuesday, March 12, 2024, 18:30–18:45, HBR 62: EG 03

Ω_c⁰ production in pp collisions at √s = 13 TeV with ALICE — •Tiantian Cheng for the ALICE Germany collaboration — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — Central China Normal University, Wuhan, China

Recent measurements of the production of charm hadrons at midrapidity in pp collisions at √s = 5.02 and 13 TeV showed that baryon-to-meson yield ratios are significantly larger than those measured in e⁺e⁻ collisions for different charm-baryon species. These observations suggest that the charm fragmentation fractions are not universal and that the baryon-to-meson ratios depend on the collision systems.

Currently, a significant limitation to measurements of strange-charm baryon Ω_c⁰ production is the absence of precise branching ratio (BR) measurements. In this talk, the new measurement of the inclusive p_T-differential cross section times branching ratio of the Ω_c⁰ baryon measured in the decay channels Ω_c⁰ → Ω⁻e⁺ν_e and Ω_c⁰ → Ω⁻π⁺ in pp collisions at √s = 13 TeV will be reported, together with the fraction BR(Ω_c⁰ → Ω⁻e⁺ν_e)/ BR(Ω_c⁰ → Ω⁻π⁺). The final result will be compared with theoretical calculations and experimental measurements from other Collaborations.

Keywords: heavy flavour; hadronisation; branching fraction