@article{10902/28688,
year = {2022},
url = {https://hdl.handle.net/10902/28688},
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 √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.},
publisher = {American Physical Society},
publisher = {Physical Review Letters, 2022, 128, 032001},
title = {Evidence for X(3872) in Pb-Pb collisions and studies of its prompt production at sNN =5.02 TeV},
author = {Sirunyan, A. M. and Cabrillo Bartolomé, José Iban and Calderón Tazón, Alicia and Chazin Quero, Bárbara and Duarte Campderros, Jorge and Fernández García, Marcos and Fernández Manteca, Pedro José and García Alonso, Andrea and Gómez Gramuglio, Gervasio and Martínez Rivero, Celso and Martínez Ruiz del Árbol, Pablo and Matorras Weinig, Francisco and Piedra Gómez, Jonatan and Prieëls, Cedric and Ricci-Tam, Francesca Shun-Ning Annarosa and Rodrigo Anoro, Teresa and Ruiz Jimeno, Alberto and Russo, Lorenzo and Scodellaro, Luca and Vila Álvarez, Iván  and Vizán García, Jesús Manuel},
}