Lobo Salvia, AniolGarrido Beltrán, LluísGioventù, AlessandraGironella Gironell, PereGomez Fernandez, SergioGraugés Pous, EugeniLópez Huertas, AlbertManera Escalero, RafelMarin Benito, CarlaMauricio Ferre, JoanVazquez Gomez, RicardoLHCb collaboration2025-06-172025-06-1720241126-6708https://hdl.handle.net/2445/221600The radiative decays χc1(3872) → ψ(2S)γ and χc1(3872) → J/ψγ are used to probe the nature of the χc1(3872) state using proton-proton collision data collected with the LHCb detector, corresponding to an integrated luminosity of 9 fb−1 . Using the B + → χc1(3872)K+ decay, the χc1(3872) → ψ(2S)γ process is observed for the frst time and the ratio of its partial width to that of the χc1(3872) → J/ψγ decay is measured to be Γχc1(3872)→ψ(2S)γ Γχc1(3872)→J/ψγ = 1.67 ± 0.21 ± 0.12 ± 0.04, where the frst uncertainty is statistical, the second systematic and the third is due to the uncertainties on the branching fractions of the ψ(2S) and J/ψ mesons. The measured ratio makes the interpretation of the χc1(3872) state as a pure D0D¯ ∗0 + D¯ 0D∗0 molecule questionable and strongly indicates a sizeable compact charmonium or tetraquark component within the χc1(3872) state.31 p.application/pdfengcc-by (c) Aaij, R. et al., 2024http://creativecommons.org/licenses/by/4.0/DetectorsEspectroscòpiaHadronsDetectorsSpectrum analysisHadronsinfo:eu-repo/semantics/article7565592025-06-17info:eu-repo/semantics/openAccess