LHCb CollaborationAlfonso Albero, AlejandroGarcía Moreno, PaulaGarrido Beltrán, LluísGironella Gironell, P.Gomez Fernandez, S.Graugés Pous, EugeniLobo Salvia, A.Mauricio, J.Vazquez Gomez, R.Marin Benito, Carla2022-05-102022-05-1020212469-9985https://hdl.handle.net/2445/185483This article reports the first measurement of prompt χc1 and χc2 charmonium production in nuclear collisions at Large Hadron Collider energies. The cross-section ratio σ(χc2)/σ(χc1) is measured in pPb collisions at √ sNN = 8.16 TeV, collected with the LHCb experiment. The χc1,2 states are reconstructed via their decay to a J/ψ meson, subsequently decaying into a pair of oppositely charged muons, and a photon, which is reconstructed in the calorimeter or via its conversion in the detector material. The cross-section ratio is consistent with unity in the two considered rapidity regions. Comparison with a corresponding cross-section ratio previously measured by the LHCb collaboration in pp collisions suggests that χc1 and χc2 states are similarly affected by nuclear effects occurring in pPb collisions.30 p.application/pdfeng(c) American Physical Society, 2021HadronsGran Col·lisionador d'HadronsFísica de partículesExperimentsHadronsLarge Hadron Collider (France and Switzerland)Particle physicsExperimentsinfo:eu-repo/semantics/article7210722022-05-10info:eu-repo/semantics/openAccess