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G. and Spanier, S. and Bouhali, O. and and Dalchenko, M. and De Mattia, M. and Delgado, A. and Eusebi, R. and and Gilmore, J. and Huang, T. and Kamon, T. and Kim, H. and Luo, S. and and Malhotra, S. and Marley, D. and Mueller, R. and Overton, D. and Pernie, and L. and Rathjens, D. and Safonov, A. and Akchurin, N. and Damgov, J. and and De Guio, F. and Hegde, V and Kunori, S. and Lamichhane, K. and Lee, S. and W. and Mengke, T. and Muthumuni, S. and Peltola, T. and Undleeb, S. and and Volobouev, I and Wang, Z. and Whitbeck, A. and Greene, S. and Gurrola, and A. and Janjam, R. and Johns, W. and Maguire, C. and Melo, A. and Ni, H. and and Padeken, K. and Romeo, F. and Sheldon, P. and Tuo, S. and Velkovska, and J. and Verweij, M. and Arenton, M. W. and Barria, P. and Cox, B. and and Cummings, G. and Hakala, J. and Hirosky, R. and Joyce, M. and Ledovskoy, and A. and Neu, C. and Tannenwald, B. and Wang, Y. and Wolfe, E. and Xia, F. and and Harr, R. and Karchin, P. E. and Poudyal, N. and Sturdy, J. and and Thapa, P. and Black, K. and Bose, T. and Buchanan, J. and Caillol, C. and and Carlsmith, D. and Dasu, S. and De Bruyn, I and Dodd, L. and Galloni, and C. and He, H. and Herndon, M. and Herve, A. and Hussain, U. and Lanaro, and A. and Loeliger, A. and Loveless, R. and Sreekala, J. Madhusudanan and and Mallampalli, A. and Pinna, D. and Ruggles, T. and Savin, A. and Sharma, and V and Smith, W. H. and Teague, D. and Trembath-reichert, S. and CMS and Collaboration", journal = "Physical Review and Physical Review Letters Index", year = "2022", volume = "128", number = "3", publisher = "AMER PHYSICAL SOC", issn = "0094-0003", doi = "10.1103/PhysRevLett.128.032001", abstract = "The 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 root s(NN) = 5.02 TeV per nucleon pair, using the decay chain X(3872) -> J/psi pi(+)pi(-) -> 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 vertical bar y vertical bar < 1.6 and 15 < p(T) < 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(Pb-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." }