Mainz 2022 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 12: Heavy-Ion Collisions and QCD Phases III
HK 12.1: Group Report
Monday, March 28, 2022, 16:00–16:30, HK-H1
Measurements of Heavy-flavour Baryon Production with ALICE at the LHC — •Jeremy Wilkinson for the ALICE collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt
The measurement of charmed baryons in hadronic collision systems at the LHC has recently shown an enhancement of the charmed baryon-to-meson ratios (Λc+/D0 and Ξc/D0) with respect to previous measurements in e+e− and e−p collisions, challenging previous assumptions about the universality of charm hadronisation processes between different collision systems. This in turn has a significant effect on the measured total charm cross section, where previously the relative contributions of charmed baryons had to be assumed based on results from leptonic collision experiments.
This talk will present the latest measurements performed by the ALICE Collaboration for charmed baryon production at mid-rapidity in pp and p–Pb collisions at the LHC. In particular, we highlight recent developments in analysis techniques using the XGBoost algorithm for machine learning selections, and the KFParticle package, which uses a Kalman filter to re-fit the decay tracks from baryon candidates and provide constraints to improve the mass resolution. These methods provide unprecedented experimental access to the low-pT region for Λc+ to serve as a constraint on the charm fragmentation fractions. In addition, they can be used to give indirect access to the beauty sector through non-prompt Λc+, as well as previously inaccessible decays such as Ωc0→ Ω−π+ and Ξc+→Ξ−π+π+.