${\Lambda }_{\mathrm{c}}^{+}$ production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

Abstract

A measurement of the production of prompt ${\Lambda }_{\mathrm{c}}^{+}$ baryons in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ALICE detector at the LHC is reported. The ${\Lambda }_{\mathrm{c}}^{+}$ and ${\overline{\Lambda }}_{\mathrm{c}}^{-}$ were reconstructed at midrapidity ($|y|<0.5$) via the hadronic decay channel ${\Lambda }_{\mathrm{c}}^{+}\to \mathrm{p}{\mathrm{K}}_{\mathrm{S}}^0$ (and charge conjugate) in the transverse momentum and centrality intervals $6<p_{\mathrm{T}}<12$ GeV/$c$ and 0-80%. The ${\Lambda }_{\mathrm{c}}^{+}$/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 $\sqrt{s}=7$ TeV and in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ 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 $p_{\mathrm{T}}$ interval covered by the measurements in the two collision system. The ${\Lambda }_{\mathrm{c}}^{+}$/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 ${\Lambda }_{\mathrm{c}}^{+}$ nuclear modification factor, $R_{\mathrm{AA}}$, is also presented. The measured values of the $R_{\mathrm{AA}}$ of ${\Lambda }_{\mathrm{c}}^{+}$, D${}_{\mathrm{s}}$ and non-strange D mesons are compatible within the combined statistical and systematic uncertainties. They show, however, a hint of a hierarchy $(R_{\mathrm{AA}}^{{\mathrm{D}}^0}<R_{\mathrm{AA}}^{{\mathrm{D}}_{\mathrm{s}}}<R_{\mathrm{AA}}^{{\Lambda }_{\mathrm{c}}^{+}})$, conceivable with a contribution of recombination mechanisms to charm hadron formation in the medium.

19 pages, 3 captioned figures, 1 table, authors from page 14, published, figures at http://alice-publications.web.cern.ch/node/4694

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