Centrality dependence of high-$p_{\mathrm{T}}$ D meson suppression in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV

Abstract

The nuclear modification factor, $R_{\mathrm{AA}}$, of the prompt charmed mesons ${\mathrm{D}}^0$, ${\mathrm{D}}^{+}$ and ${\mathrm{D}}^{\ast +}$, and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at a centre-of-mass energy $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV in two transverse momentum intervals, $5<p_{\mathrm{T}}<8$ GeV/$c$ and $8<p_{\mathrm{T}}<16$ GeV/$c$, and in six collision centrality classes. The $R_{\mathrm{AA}}$ shows a maximum suppression of a factor of 5-6 in the 10% most central collisions. The suppression and its centrality dependence are compatible within uncertainties with those of charged pions. A comparison with the $R_{\mathrm{AA}}$ of non-prompt $\mathrm{J}/\psi$ from B meson decays, measured by the CMS Collaboration, hints at a larger suppression of D mesons in the most central collisions.

21 pages, 5 figures, 1 table, authors from page 16, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1643. Addendum to this paper published on JHEP 6 (2017) 1, also available at http://cds.cern.ch/record/2265113

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