CMS-PAS-HIN-18-009

CMS-PAS-HIN-18-009
Production of $\Lambda_C^{+}$ baryons in proton-proton and lead-lead collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}}=$ 5.02 TeV
CMS Collaboration
May 2019

Abstract: The differential cross sections of $\Lambda_C^{+}$ baryon production are measured via the exclusive decay channel $\Lambda_C^{+}\to \mathrm{p} \mathrm{K}^{-}\pi^{+}$ , 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 with the CMS detector at the LHC. The measurement is performed within the $\Lambda_C^{+}$ 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 $\Lambda_C^{+}$ for $p_{\mathrm{T}}$ of 10-20 GeV/ $c$ suggest a possible suppression in central PbPb collisions compared to pp collisions. The $\Lambda_C^{+} / D^0$ 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.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, PLB 803 (2020) 135328. The superseded preliminary plots can be found here.

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