SMuK 2021 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 12: Heavy-Ion Collisions and QCD Phases II
HK 12.1: Gruppenbericht
Dienstag, 31. August 2021, 16:30–17:00, H1
Charm production and hadronisation at the LHC with ALICE — •Jianhui Zhu for the ALICE collaboration — GSI Helmholtz Centre for Heavy Ion Research
Recent measurements of charm-baryon production at midrapidity by the ALICE collaboration show baryon-to-meson yield ratios significantly higher than those in e+e− collisions for different charm-hadron species, suggesting that the charm fragmentation is not universal across different collisions systems. Thus, measurements of charm-baryon production are crucial to study the charm quark hadronisation in proton–proton collisions, relevant also for the description of heavy-flavour mesons. In large systems such as Pb-Pb collisions, the charm baryon-to-meson yield ratio is expected to be further enhanced if charm quarks hadronise via recombination with the surrounding light quarks in the QGP.
In this talk, the measurements of Λc+, Ξc0,+ and the first measurement of Ωc0 baryons performed with the ALICE detector at midrapidity in pp collisions at √s=5.02 and 13 TeV, as well as the total charm cross section and charm fragmentation fractions will be presented. In Pb-Pb collisions, the measurement of Λc+ production, the nuclear modification factor and the Λc+/D0 ratio will be discussed. These results will be compared to predictions from Monte Carlo event generators and theoretical calculations based on the statistical hadronisation model and on the hadronisation via coalescence.