[formula omitted] production in Pb–Pb collisions at [formula omitted] TeV.

A measurement of the production of prompt Λ c + baryons in Pb–Pb collisions at s NN = 5.02 TeV with the ALICE detector at the LHC is reported. The Λ c + and Λ ‾ c − were reconstructed at midrapidity (| y | < 0.5) via the hadronic decay channel Λ c + → p K S 0 (and charge conjugate) in the transverse momentum and centrality intervals 6 < p T < 12 GeV/ c and 0–80%. The Λ c + / D 0 ratio, which is sensitive to the charm quark hadronisation mechanisms in the medium, is measured and found to be larger than the ratio measured in minimum-bias pp collisions at s = 7 TeV and in p–Pb collisions at s NN = 5.02 TeV. In particular, the values in p–Pb and Pb–Pb collisions differ by about two standard deviations of the combined statistical and systematic uncertainties in the common p T interval covered by the measurements in the two collision systems. The Λ c + / D 0 ratio is also compared with model calculations including different implementations of charm quark hadronisation. The measured ratio is reproduced by models implementing a pure coalescence scenario, while adding a fragmentation contribution leads to an underestimation. The Λ c + nuclear modification factor, R AA , is also presented. The measured values of the R AA of Λ c + , D s + and non-strange D mesons are compatible within the combined statistical and systematic uncertainties. They show, however, a hint of a hierarchy (R AA D 0 < R AA D s + < R AA Λ c + ) , conceivable with a contribution from coalescence mechanisms to charm hadron formation in the medium. [ABSTRACT FROM AUTHOR]