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Evidence for X(3872) in Pb-Pb Collisions and Studies of its Prompt Production at sNN =5.02 TeVSirunyan, A.M.Tumasyan, A.Adam, W.Ambrogi, F.Bergauer, T.Dragicevic, M.Erö, J.Escalante Del Valle, A.Flechl, M.Frühwirth, R.Jeitler, M.Krammer, N.Krätschmer, I.Liko, D.Madlener, T.Mikulec, I.Rad, N.Schieck, J.Schöfbeck, R.Spanring, M.Waltenberger, W.Wulz, C.-E.Zarucki, M.Drugakov, V.Mossolov, V.Suarez Gonzalez, J.Darwish, M.R.De Wolf, E.A.Di Croce, D.Janssen, X.Kello, T.Lelek, A.Pieters, M.Rejeb Sfar, H.Van Haevermaet, H.Van Mechelen, P.Van Putte, S.Van Remortel, N.Blekman, F.Bols, E.S.Chhibra, S.S.D'Hondt, J.De Clercq, J.Lontkovskyi, D.Lowette, S.Marchesini, I.Moortgat, S.Python, Q.Tavernier, S.Van Doninck, W.Binary alloysColliding beam acceleratorsLead alloysNitrogen compoundsTellurium compoundsA-centerCenter-of-mass energiesCentre-of-mass energiesCMS detectorsDecay chainsIntegrated luminosityMomentum rangePb-Pb collisionsRelativistic heavy ion collisionTransverse momentaHeavy ionsThe first evidence for X(3872) production in relativistic heavy ion collisions is reported. The X(3872) production is studied in lead-lead (Pb-Pb) collisions at a center-of-mass energy of sNN=5.02 TeV per nucleon pair, using the decay chain X(3872)→J/ψπ+π-→μ+μ-π+π-. 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|<1.6 and 15<pT<50 GeV/c. The significance of the inclusive X(3872) signal is 4.2 standard deviations. The prompt X(3872) to ψ2S yield ratio is found to be ρPb-Pb=1.08±0.49(stat)±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. © 2022 CERN.American Physical Society2022Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/12802https://doi.org/10.1103/physrevlett.128.0320010031-9007enPhysical Review Lettersinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/12802