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 12.2: Vortrag
Dienstag, 31. August 2021, 17:00–17:15, H1
Λc+ cross section in p–Pb collisions down to pT = 0 at √sNN = 5.02 TeV measured with ALICE — •Annalena Sophie Kalteyer for the ALICE collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
In this contribution, the latest ALICE measurement of Λc+ production performed down to pT=0 in p–Pb collisions at √sNN = 5.02 TeV is presented. This allows to show the first measurement of Λc+/D0 and Λc+ nuclear modification factor (RpPb) down to pT = 0 in this system. The baryon-to-meson ratio is significantly enhanced with respect to the one in e+e− collisions, suggesting that the charm fragmentation is not a universal process across different collision systems. Furthermore, the ratio as a function of the transverse momentum is shifted to higher pT in p–Pb collisions with respect to pp collisions. The reason for this momentum shift could be a modification of the charm hadronisation mechanism and/or the presence of radial flow in p–Pb collisions. Typically this is observed in heavy-ion collisions where a hot deconfined medium is created. In addition, the RpPb is useful to investigate possible initial state effects such as shadowing in the collisions of a proton with a heavy nucleus. RpPb can help disentangling initial from final state effects, which would involve the presence of a medium. The results are compared with theoretical calculations including initial and final state effects.