# Production of $\Lambda_\mathrm{c}^+$ baryons in proton-proton and lead-lead collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV

## TL;DR

This paper measures the production of $\\Lambda_\mathrm{c}^+$ baryons in proton-proton and lead-lead collisions at 5.02 TeV, revealing potential suppression in heavy-ion collisions and comparing baryon-to-meson ratios to theoretical models.

## Contribution

First measurement of $\\Lambda_\mathrm{c}^+$ production spectra in pp and PbPb collisions at 5.02 TeV, with insights into baryon enhancement and suppression in heavy-ion environments.

## Key findings

- Possible suppression of $\\Lambda_\mathrm{c}^+$ yields in central PbPb collisions.
- The $\\Lambda_\mathrm{c}^+$/D$^0$ ratio in PbPb is consistent with pp in the same $p_T$ range.
- Comparison of experimental results with theoretical models of charm baryon production.

## Abstract

The differential cross sections of $\Lambda_\mathrm{c}^+$ baryon production are measured via the exclusive decay channel $\Lambda_\mathrm{c}^+$ $\to$ pK$^-\pi^+$ using the CMS detector at the LHC. Spectra are measured as a function of transverse momentum ($p_\mathrm{T}$) in proton-proton (pp) and lead-lead (PbPb) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The measurement is performed within the $\Lambda_\mathrm{c}^+$ rapidity interval $|y|$ $<$ 1.0 in the $p_\mathrm{T}$ range of 5-20 GeV/$c$ in pp and 10-20 GeV/$c$ in PbPb collisions. The observed yields of $\Lambda_\mathrm{c}^+$ for $p_\mathrm{T}$ of 10-20 GeV/$c$ suggest a possible suppression in central PbPb collisions compared to pp collisions scaled by the number of nucleon-nucleon (NN) interactions. The $\Lambda_\mathrm{c}^+/$D$^0$ production ratio in pp collisions is compared to theoretical models. In PbPb collisions, this ratio is consistent with the result from pp collisions in their common $p_\mathrm{T}$ range.