Chekhovsky, V.Hayrapetyan, A.Makarenko, V.Tumasyan, A.Adam, W.Andrejkovic, J. W.Dutta, S.2026-01-152026-01-1520250031-90071079-711410.1103/c9wp-5tq32-s2.0-105016046382https://doi.org/10.1103/c9wp-5tq3https://hdl.handle.net/20.500.14517/8686Sano, Fonseca De Souza/0000-0001-7830-0837; Painesis, Haris/0000-0001-5061-7031; Thachayath Sugunan, Aravind/0000-0001-6545-0350; Fernández Ramos, Juan Pablo/0000-0002-0122-313X; Wilson, Jonathan/0000-0002-5672-7394; Christoforou, Konstantinos/0000-0003-2205-1100; Erice Cid, Carlos Francisco/0000-0002-6469-3200; Giacomo, Bolini/0000-0001-5490-605X; Faccioli, Pietro/0000-0003-1849-6692; Riti, Federica/0000-0002-1466-9077; Zhang, Yousen/0000-0002-6812-761X; Figueiredo, Diego/0000-0003-2514-6930; Pérez Prada, Maximilian/0000-0002-2831-463X; De Souza Lemos, Dener/0000-0003-1982-8978; Phor, Saumya/0000-0001-7842-9518; Palencia Cortezon, Jose Enrique/0000-0001-8264-0287; Fernandez Perez Tomei, Thiago Rafael/0000-0002-1809-5226; Hernández Calama, José María/0000-0001-6436-7547; Consuegra Roiguez, Sana/0000-0002-1383-1837; Ruales, Anderson/0000-0003-0826-0803; Ligabue, Franco/0000-0002-1549-7107; Agicevic, Marko/0000-0003-1967-6783; Noll, Dennis Daniel Nick/0000-0002-0176-2360; Lee, Jason/0000-0002-2153-1519; Ruiz, Jose/0000-0002-3306-0363; Lee, Jason/0000-0002-2153-1519;Bound states of charm and anticharm quarks, known as charmonia, have a rich spectroscopic structure that can be used to probe the dynamics of hadron production in high-energy hadron collisions. Here, the cross section ratio of excited (psi(2S)) and ground state (J/psi) vector mesons is measured as a function of the charged-particle multiplicity in proton-lead (pPb) collisions at a center-of-mass (CM) energy per nucleon pair of 8.16 TeV. The data corresponding to an integrated luminosity of 175 nb(-1) were collected using the CMS detector. The ratio is measured separately for prompt and nonprompt charmonia in the transverse momentum range 6.5 < p(T) < 30 GeV and in four rapidity ranges spanning -2.865 < y(CM) < 1.935. For the first time, a statistically significant multiplicity dependence of the prompt cross section ratio is observed in proton-nucleus collisions. There is no clear rapidity dependence in the ratio. The prompt measurements are compared with a theoretical model which includes interactions with nearby particles during the evolution of the system. These results provide additional constraints on hadronization models of heavy quarks in nuclear collisions.eninfo:eu-repo/semantics/openAccessArticleQ1Q11359WOS:00156937760000340952232