Aaij, R.Vazquez Gomez, R.Mauricio, J.Marin Benito, CarlaManera Escalero, RafelLópez Huertas, AlbertLobo Salvia, AniolGraugés Pous, EugeniGomez Fernandez, S.Gioventù, AlessandraGironella Gironell, PereGarrido Beltran, LluísGarcia Moreno, PaulaComerma-Montells, AlbertCalefice, LukasLHCb Collaboration2025-05-092025-05-092025-01-240031-9007https://hdl.handle.net/2445/220922The first study of J=ψϕ production in diffractive processes in proton-proton collisions is presented. The study is based on an LHCb dataset recorded at center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5 fb−1. The data disfavor a nonresonant J=ψϕ production but are consistent with a resonant model including several resonant states observed previously only in Bþ → J=ψϕKþ decays. The χc0ð4500Þ state is observed with a significance over 6σ and the χc1ð4274Þ is confirmed with a significance of more than 4σ12 p.application/pdfeng(c) American Physical Society, 2025Cromodinàmica quànticaCol·lisions (Física)Mesons (Física nuclear)Quantum chromodynamicsCollisions (Physics)Mesons (Nuclear physics)info:eu-repo/semantics/article7560852025-05-09info:eu-repo/semantics/openAccess