2026-04-17T11:57:04Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1854902025-12-05T16:47:56Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Alfonso Albero, Alejandro author García Moreno, Paula author Garrido Beltrán, Lluís author Gironella Gironell, P. author Gomez Fernandez, S. author Graugés Pous, Eugeni author Lobo Salvia, A. author Mauricio, J. author Vazquez Gomez, R. author Marin Benito, Carla author 2022-05-10T15:24:04Z 2022-05-10T15:24:04Z 2021 2022-05-10T15:24:04Z The production of χc1(3872) and ψ(2S) hadrons is studied as a function of charged particle multiplicity in pp collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2 fb−1 . For both states, the fraction that is produced promptly at the collision vertex is found to decrease as charged particle multiplicity increases. The ratio of χc1(3872) to ψ(2S) cross-sections for promptly produced particles is also found to decrease with multiplicity, while no significant dependence on multiplicity is observed for the equivalent ratio of particles produced away from the collision vertex in b-hadron decays. This behavior is consistent with a calculation that models the χc1(3872) structure as a compact tetraquark. Implications for the binding energy of the χc1(3872) state are discussed. Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments Observation of Multiplicity Dependent Prompt χc1 (3872) and ψ (2S) Production in pp Collisions