{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.93882.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1848438"}},{"@id":"https://doi.org/10.1103/PhysRevLett.128.032001","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2021","description":"The first evidence for X(3872) production in relativistic heavy ion collisions is reported. The X(3872) production is studied in lead-lead (PbPb) collisions at a center-of-mass energy of $\\sqrt{s_\\mathrm{NN}} =$ 5.02 TeV per nucleon pair, using the decay chain X(3872) $\\to$ J$/\\psi\\, \\pi^+\\pi^- \\to$ $\\mu^+\\mu^-\\pi^+\\pi^-$. The data were recorded with the CMS detector in 2018 and correspond to an integrated luminosity of 1.7 nb$^{-1}$. The measurement is performed in the rapidity and transverse momentum ranges $|y|$ $\\lt$ 1.6 and 15 $\\lt$ $p_\\mathrm{T}$ $\\lt$ 50 GeV$/c$. The significance of the inclusive X(3872) signal is 4.2 standard deviations. The prompt X(3872) to $\\psi$(2S) yield ratio is found to be $\\rho^\\mathrm{PbPb} = $ 1.08 $\\pm$ 0.49 (stat) $\\pm$ 0.52 (syst), to be compared with typical values of 0.1 for pp collisions. This result provides a unique experimental input to theoretical models of the X(3872) production mechanism, and of the nature of this exotic state.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.93882.v1/t1","@type":"Dataset","description":"The yield ratio $\\rho^{\\mathrm{PbPb}}$ of prompt X(3872) over $\\psi(\\mathrm{2S})$ production in PbPb collisions at 5.02 TeV","name":"Figure 2"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1848438?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/93882"}],"inLanguage":"en","name":"Evidence for X(3872) in PbPb collisions and studies of its prompt production at $\\sqrt{s_\\mathrm{NN}}=$ 5.02 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1848438?version=1","version":1}