1 Ocak 2019 Dergi makalesi Açık Erişim

CERN İşbirliği

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    "description": "<p>A measurement of the production of prompt ${\\Lambda }_{c}^{+}$ baryons in Pb\u2013Pb collisions at $\\sqrt{{s}_{\\mathrm{NN}}}=5.02$ TeV with the ALICE detector at the LHC is reported. The ${\\Lambda }_{c}^{+}$ and ${{\\stackrel{\u203e}{\\Lambda }}_{c}}^{-}$ were reconstructed at midrapidity ($|y|&lt;0.5$) via the hadronic decay channel ${\\Lambda }_{c}^{+}\\to p{K}_{S}^{0}$ (and charge conjugate) in the transverse momentum and centrality intervals $6&lt;{p}_{T}&lt;12$ GeV/c and 0\u201380%. 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\u2013Pb collisions at $\\sqrt{{s}_{\\mathrm{NN}}}=5.02$ TeV. In particular, the values in p\u2013Pb and Pb\u2013Pb 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 $\\left({R}_{\\mathrm{AA}}^{{D}^{0}}&lt;{R}_{\\mathrm{AA}}^{{D}_{s}^{+}}&lt;{R}_{\\mathrm{AA}}^{{\\Lambda }_{c}^{+}}\\right)$, conceivable with a contribution from coalescence mechanisms to charm hadron formation in the medium.</p>", 
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    "journal": {
      "title": "Physics Letters B", 
      "volume": "793 C"
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    "title": "production in Pb\u2013Pb collisions at TeV"
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