Speaker
Description
Measurements of heavy-flavour meson and baryon production in proton-proton (pp) collisions are crucial to study the charm quark hadronisation mechanisms and the possible difference with respect to $e^+e^-$ collisions. Measurements in p-Pb collisions are also important to investigate the role of the cold nuclear matter (CNM) effects. Furthermore, measurements in both collision systems provide important references to the measurements performed in Pb--Pb collisions. Here charm quarks, which are created at the beginning of the collision and interact with the medium during all the stages of the system evolution, are useful probes of the energy loss and their hadronisation in hadrons. In particular, the measurement of charmed baryon-to-meson ratio $\Lambda_c^+/D^0$ is sensitive to the hadronisation mechanisms and could provide further insights about the role of the different mechanisms in $e^+e^-$, pp, and Pb-Pb collisions.
In this contribution, measurements of the $\Lambda_c^+/D^0$ ratio in pp and p-Pb collisions at $\sqrt{s_{\text{NN}}}$ = 5.02 TeV are presented. The results show an increased $\Lambda_c^+/D^0$ ratio compared to that measured in $e^+e^-$ and e−p collisions, which challenges the usual assumption of quark fragmentation being independent of collision system. Furthermore, new results of $\Lambda_c^+$ production in p-Pb collisions, measured for the first time down to $p_T=0, are shown. The nuclear modification factor in p-Pb will be discussed, as well as the comparison with theoretical models.
| Collaboration / Activity | ALICE |
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