Speaker
Description
One of the present challenges for the theoretical understanding of heavy-quark hadronization is represented by the description of the measurements of heavy baryon production in $pp$, $pA$ and $AA$ collisions. The $\Lambda_c/D^0$ ratio observed in $AA$ collisions has a value of the order of the unity, and experimental measurements in $pp$ collisions at both $\sqrt{s}=5.02 \,\rm TeV$ and $\sqrt{s}=13 \,\rm TeV$ have shown ratios for charm baryons $\Lambda_c$, $\Xi_c^0$ and $\Omega_c^0$ respect to $D^0$ meson larger than that measured and expected in $e^+e^-$, $ep$ collisions.
Using the relativistic Boltzmann transport approach coupled to an hadronization mechanism based on the coalescence and fragmentation processes we show the results obtained in $AA$ collisions for $D^0$, $D_s$, $\Lambda_c$ spectra and the related baryon to meson ratios at RHIC and LHC. where we have found a large $\Lambda_c$ production resulting in a baryon over meson ratio of order O(1).
Extending this approach to study the production of hadrons containing multiple charm quark, i.e. $\Xi_{cc}$, $\Omega_{cc}$ and $\Omega_{ccc}$ and we present here new predictions of these productions in different collision systems (PbPb, KrKr, ArAr).
Furthermore, we present results obtained in $pp$ collisions at top LHC energies assuming the formation of an hot QCD matter at finite temperature for these systems and we show the results for the heavy baryon/meson ratio and the $p_T$ spectra of charmed hadrons with and without strangeness content: $D^{0}$, $D_{s}$, $\Lambda_{c}^{+}$, $\Sigma_{c}$ and the recently measured $\Xi_c$ baryon, finding an enhancement in comparison with the ratio observed for $e^+e^-$, $ep$ collisions; with this approach we also predict a significant production of $\Omega_c$ respect to $D^0$ such that $\Omega_c/D^0 \sim 0.15$.
[1] V. Minissale, S. Plumari and V. Greco, Physics Letters B 821 (2021) 136622.
[2] S. Plumari, V. Minissale, S.K. Das, G. Coci and V. Greco, Eur.Phys.J. C 78 (2018) no.4, 348
