CERN Accelerating science

Article
Report number arXiv:2406.17006 ; LHCb-PAPER-2024-015 ; CERN-EP-2025-157 ; LHCB-PAPER-2024-015
Title Probing the nature of the χc1(3872) state using radiative decays
Author(s) LHCb Collaboration  Εμφάνιση και των 2238 συγγραφέων
Corporate Author(s) LHCb Collaboration
Publication 2024-11-21
Imprint 26 Jun 2024
Number of pages 33
Note 31 pages, 2 figures. All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2024-015.html (LHCb public pages)
In: JHEP 2411 (2024) 121
DOI 10.1007/JHEP11(2024)121
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; LHCb
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 9fb1. 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 Γχc1(3872)ψ(2S)γΓχc1(3872)Jψγ=1.67±0.21±0.12±0.04, 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¯0D0 molecule questionable and strongly indicates a sizeable compact charmonium or tetraquark component within the χc1(3872) state.
Copyright/License Preprint: © 2024-2025 CERN (License: CC-BY-4.0)



Corresponding record in: Inspire
Email contact: lhcb.secretariat@cern.ch


 Δημιουργία εγγραφής 2024-06-26, τελευταία τροποποίηση 2024-12-03


Πλήρες κείμενο:
2406.17006 - Κατέβασμα πλήρες κειμένουPDF
document - Κατέβασμα πλήρες κειμένουPDF
(πρόσθετα αρχεία)
  • Send to ScienceWise.info