@article{8bfcf7fffccb412f9bd0b8ecdec9cd55,
title = "Probing the nature of the χc1(3872) state using radiative decays",
abstract = "Abstract: The 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 first time and the ratio of its partial width to that of the χc1(3872) → J/ψγ decay is measured to be (Formula presented.) where the first 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¯0 D*0 molecule questionable and strongly indicates a sizeable compact charmonium or tetraquark component within the χc1(3872) state.",
keywords = "Exotics, Hadron-Hadron Scattering, Quarkonium, Spectroscopy",
author = "{The LHCb collaboration} and R. Aaij and Abdelmotteleb, {A. S.W.} and {Abellan Beteta}, C. and F. Abudin{\'e}n and T. Ackernley and Adefisoye, {A. A.} and B. Adeva and M. Adinolfi and P. Adlarson and C. Agapopoulou and Aidala, {C. A.} and Z. Ajaltouni and S. Akar and K. Akiba and P. Albicocco and J. Albrecht and F. Alessio and M. Alexander and Z. Aliouche and {Alvarez Cartelle}, P. and R. Amalric and S. Amato and Amey, {J. L.} and Y. Amhis and L. An and L. Anderlini and M. Andersson and A. Andreianov and P. Andreola and M. Andreotti and D. Andreou and A. Anelli and D. Ao and F. Archilli and M. Argenton and {Arguedas Cuendis}, S. and A. Artamonov and M. Artuso and E. Aslanides and {Ataide Da Silva}, R. and M. Atzeni and B. Audurier and D. Bacher and {Bachiller Perea}, I. and S. Bachmann and M. Bachmayer and Back, {J. J.} and E. Golobardes and {Valls Canudas}, N. and X. Vilasis-Cardona",
note = "Publisher Copyright: {\textcopyright} The Author(s) 2024.",
year = "2024",
month = nov,
doi = "10.1007/JHEP11(2024)121",
language = "English",
volume = "2024",
journal = "Journal of High Energy Physics",
issn = "1126-6708",
publisher = "Springer Verlag",
number = "11",
}