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The first evidence for X(3872) production in relativistic heavy ion collisions, with a significance of 4.2 standard deviations, is reported. The X(3872) production is studied in lead-lead (PbPb) collisions at a center-of-mass energy of √ S  NN  = 5.02 TeV per nucleon pair with the CMS detector. The measurement is performed in the rapidity and transverse momentum ranges | y | &lt; 1.6 and 15 &lt;  p  T  &lt; 50 GeV/ c . The prompt X(3872) to ψ(2S) yield ratio is found to be ρ PbPb  = 1.08 ± 0.49(stat.) ± 0.52(syst.), to be compared with typical values of 0.1 for pp collisions. This provides new input to theoretical models of the X(3872) production mechanism, and of the nature of this exotic state.

Evidence for X(3872) in PbPb collisions and studies of its prompt production at √SNN = 5.02 TeV with CMS

Evidence for X(3872) in PbPb collisions and studies of its prompt production at √S_NN = 5.02 TeV with CMS