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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/185490
Observation of Multiplicity Dependent Prompt χc1 (3872) and ψ (2S) Production in pp Collisions
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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.
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ALFONSO ALBERO, Alejandro, GARCÍA MORENO, Paula, GARRIDO BELTRÁN, Lluís, GIRONELLA GIRONELL, P., GOMEZ FERNANDEZ, S., GRAUGÉS POUS, Eugeni, LOBO SALVIA, A., MAURICIO, J., VAZQUEZ GOMEZ, R., MARIN BENITO, Carla. Observation of Multiplicity Dependent Prompt χc1 (3872) and ψ (2S) Production in pp Collisions. _Physical Review Letters_. 2021. Vol. 2021, núm. 1-20. [consulta: 24 de gener de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/185490]