Speaker
Description
Measurements of heavy baryon production in $pp$, $pA$ and $AA$ collisions from RHIC to top LHC energies have recently attracted more and more attention, currently representing a challenge for the heavy-quark hadronization theoretical understanding.
The $\Lambda_c/D^0$ ratio observed in $AA$ collision at RHIC and LHC energies has a value of the order of the unity.
Recent experimental measurements in $pp$ collisions at both $\sqrt{s}=5.02 \,\rm TeV$ $\sqrt{s}=13 \,\rm TeV$ 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.
We study the hadronization after the propagation of charm quarks in the quark-gluon plasma (QGP). The propagation is described by means of a relativistic Boltzmann transport approach where the non-perturbative interaction between heavy quarks and light quarks is described by means of a quasi-particle approach.
We present a coalescence plus fragmentation model for the hadronization and 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.
We found a large $\Lambda_c$ production resulting in a baryon over meson ratio of order O(1).
We propose the $v_2$ of charmed baryons as a possible way to have a deeper insight into the hadronization mechanism.
We have furthermore extended this approach to study the production of hadrons containing multiple charm quark, i.e. $\Xi_{cc}$, $\Omega_{cc}$ and $\Omega_{ccc}$, and bottom quarks.
We present, also, results for the charmed hadron production in $pp$ collisions at top LHC energies (5 TeV, 13 TeV) assuming the formation of an hot QCD matter at finite temperature for these systems.
We calculate 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; moreover with this approach we predict also 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
