Measurement of prompt and nonprompt charmonium suppression in PbPb collisions at 5.02 TeV

Abstract

The nuclear modification factors of J/$\psi$ and $\psi$(2S) mesons are measured in PbPb collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV. The analysis is based on PbPb and pp data samples collected by CMS at the LHC in 2015, corresponding to integrated luminosities of 464 $\mu$b${}^{-1}$ and 28 pb${}^{-1}$, respectively. The measurements are performed in the dimuon rapidity range of $|y|<$ 2.4 as a function of centrality, rapidity, and transverse momentum (p${}_{\mathrm{T}}$) from p${}_{\mathrm{T}}=$ 3 GeV/$c$ in the most forward region and up to 50 GeV/$c$. Both prompt and nonprompt (coming from b hadron decays) mesons are observed to be increasingly suppressed with centrality, with a magnitude similar to the one observed at $\sqrt{s_{\mathrm{NN}}}=$ 2.76 TeV for the two J/$\psi$ meson components. No dependence on rapidity is observed for either prompt or nonprompt J/$\psi$ mesons. An indication of a lower prompt J/$\psi$ meson suppression at p${}_{\mathrm{T}}>$ 25 GeV/$c$ is seen with respect to that observed at intermediate p${}_{\mathrm{T}}$. The prompt $\psi$(2S) meson yield is found to be more suppressed than that of the prompt J/$\psi$ mesons in the entire p${}_{\mathrm{T}}$ range.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-16-025 (CMS Public Pages)

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