[séminaire] Charmed baryon production measurements with the ALICE experiment at the LHC

by NORMAN Jaime

Tuesday 23 Jan 2018, 11:00 → 12:00 Europe/Paris

Grand Amphi (LPSC)

Asymptotic freedom, a feature of Quantum Chromodynamics, leads to a phase transition of nuclear matter at high temperatures or energy densities to a phase known as the Quark-Gluon Plasma, where quarks and gluons are deconfined. This state of matter can be studied in relativistic heavy-ion collisions. Particles containing heavy quarks, i.e. charm and beauty, have been proposed as probes of the properties of the Quark Gluon Plasma, where the measurement of mesons and baryons can offer insight into the transport properties of the medium and mechanisms related to the formation of hadrons during the transition back to ‘confined’ quark states. Proton-proton and proton-lead collisions offer a crucial benchmark for these measurements, and can also reveal important insights into particle production and interaction mechanisms. This talk will present the measurement of the charmed baryon Λc in proton-proton and proton-lead collisions with the ALICE experiment at the Large Hadron Collider, focusing on the measurement via the reconstruction of the hadronic decay channel Λc -> pKπ. The production cross section of the Λc baryon and the baryon-to-meson ratio Λc/D0 in proton-proton and proton-lead collisions, and the nuclear modification factor in proton-lead collisions (RpPb) will be presented and compared to theoretical predictions. Finally, prospects for future measurements during Run 3/4 of the LHC will be shown, where a new silicon tracking system (ITS) will allow for the measurement of charmed baryons in lead-lead collisions.