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# EPS-HEP2021 conference

Jul 26 – 30, 2021
Zoom
Europe/Berlin timezone

## Production and ratios of heavy hadrons from large to small collision systems with a coalescence plus fragmentation approach

Jul 26, 2021, 2:30 PM
15m
Zoom

#### Zoom

Parallel session talk Heavy Ion Physics

### Speaker

Vincenzo Minissale (Università degli Studi di Catania - INFN LNS)

### 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. The recent experimental measurements in $pp$ collisions at $\sqrt{s}=5.02 \,\rm TeV$ have shown a ratio of $\Lambda_c/D^0 \sim 0.6$, about one order of magnitude larger than that measured 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.
In this talk 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). This large production has consequences for the D meson nuclear modification factor, that results dumped in the region of low momenta, as observed in STAR data.
Furthermore we present, for the first time, results for these ratios in $pp$ collisions at top LHC energies assuming the formation of an hot QCD matter at finite temperature even 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 $D^0$.

[1] V. Minissale, S. Plumari and V. Greco, arXiv:2012.12001 [hep-ph].
[2] S. Plumari, V. Minissale, S.K. Das, G. Coci and V. Greco, Eur.Phys.J. C 78 (2018) no.4, 348
[3] F. Scardina, S. K. Das, V. Minissale, S. Plumari, V. Greco, Phys.Rev. C 96 (2017) no.4, 044905

Collaboration / Activity heavy quark hadronization Vincenzo Minissale vincenzo.minissale@lns.infn.it

### Primary authors

Vincenzo Minissale (Università degli Studi di Catania - INFN LNS) Salvatore Plumari (Università degli studi di Catania - INFN LNS) Vincenzo Greco (Università degli studi di Catania - INFN LNS)