1 Ocak 2019 Dergi makalesi Açık Erişim

CERN İşbirliği

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    <subfield code="a">&lt;p&gt;A measurement of the production of prompt ${\Lambda }_{c}^{+}$ baryons in Pb–Pb collisions at $\sqrt{{s}_{\mathrm{NN}}}=5.02$ TeV with the ALICE detector at the LHC is reported. The ${\Lambda }_{c}^{+}$ and ${{\stackrel{‾}{\Lambda }}_{c}}^{-}$ were reconstructed at midrapidity ($|y|&amp;lt;0.5$) via the hadronic decay channel ${\Lambda }_{c}^{+}\to p{K}_{S}^{0}$ (and charge conjugate) in the transverse momentum and centrality intervals $6&amp;lt;{p}_{T}&amp;lt;12$ GeV/c and 0–80%. The ${\Lambda }_{c}^{+}/{D}^{0}$ 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 ${p}_{T}$ interval covered by the measurements in the two collision systems. The ${{\Lambda }_{c}}^{+}/{D}^{0}$ 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 ${\Lambda }_{c}^{+}$ nuclear modification factor, ${R}_{\mathrm{AA}}$, is also presented. The measured values of the ${R}_{\mathrm{AA}}$ of ${\Lambda }_{c}^{+}$, ${D}_{s}^{+}$ and non-strange D mesons are compatible within the combined statistical and systematic uncertainties. They show, however, a hint of a hierarchy $\left({R}_{\mathrm{AA}}^{{D}^{0}}&amp;lt;{R}_{\mathrm{AA}}^{{D}_{s}^{+}}&amp;lt;{R}_{\mathrm{AA}}^{{\Lambda }_{c}^{+}}\right)$, conceivable with a contribution from coalescence mechanisms to charm hadron formation in the medium.&lt;/p&gt;</subfield>
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    <subfield code="a">CERN İşbirliği</subfield>
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    <subfield code="a">10.1016/j.physletb.2019.04.046</subfield>
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    <subfield code="a">production in Pb–Pb collisions at TeV</subfield>
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