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

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.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-18-009 (CMS Public Pages)

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