Orateur
Description
Heavy baryon production in pp, pA, and AA collisions from RHIC to top LHC energies presents a challenge for the theoretical understanding of heavy-quark hadronization. An hybrid approach of coalescence plus fragmentation has been successful in accurately predicting the large baryon-to-meson ratio $\Lambda_c/D^0\sim O(1)$ observed in both AA collisions at RHIC and LHC [1], as well as in pp collisions at $5.02$ and $13 \rm ;TeV$ [2]. Generally, the obtained ratio is significantly larger than those measured and expected in $e^+e^-$ and $ep$ collisions. Additionally, the same approach predicts a significant $\Xi_c/D^0\sim 0.15$ and $\Omega_c/D^0\sim 0.05$ enhancement in $pp$ collisions at $5.02 \rm ;TeV$, showing promising agreement with early ALICE measurements [2]. Furthermore, we discuss the extension of the hadronization approach to provide the first predictions for the multi-charmed baryon: $\Xi_{cc}$, $\Omega_{cc}$ and $\Omega_{ccc}$. Furthermore, we explore the evolution of the yield over a wide system size scan from $PbPb$ to $KrKr$, $ArAr$ and $OO$ as planned by ALICE3 [3].
This study allow to investigate the impact on the production coming from non-equilibrium in the charm quark distribution. We find that, generally, the predicted yield in $PbPb$ collision are quite similar to SHM if full thermalization is assumed, but on the other hand multi-charmed baryon, especially $\Omega_{ccc}$, are particularly sensitive to the degree of thermalization of the charm quark distribution. Finally, we present the predictions of the hybrid hadronization via coalescence and fragmentation for bottom hadrons $B$ meson $\Lambda_b$ and $\Xi_b$baryons and their ratios for PbPb and pp collision at top LHC energies [4].
The comparison between charm and bottom hadron production will provide a novel and more powerful insight not only into the hadronization mechanism but also into the charm and bottom quark equilibration dynamics versus the system size of colliding nuclei.
[1] S. Plumari, V. Minissale, S.K. Das, G. Coci and V. Greco, Eur.Phys.J. C 78 (2018) no.4, 348
[2] V. Minissale, S. Plumari and V. Greco, Physics Letters B 821 (2021) 136622.
[3] V. Minissale, S. Plumari, Y. Sun and V. Greco, arXiv:2305.03687.
[4] V. Minissale, S. Plumari and V. Greco, in preparation.
