Search for new decay modes of the ψ2 (3823) and the process e+e- →π0π0ψ2 (3823)

BESIII Collaboration

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Abstract

The decays ψ2(3823)→γχc0,1,2, π+π-J/ψ, π0π0J/ψ, ηJ/ψ, and π0J/ψ are searched for using the reaction e+e-→π+π-ψ2(3823) in a 19 fb-1 data sample collected at center-of-mass energies between 4.1 and 4.7 GeV with the BESIII detector. The process ψ2(3823)→γχc1 is observed in a 9 fb-1 data sample in the center-of-mass energy range 4.3-4.7 GeV, which confirms a previous observation but with a higher significance of 11.8σ, and evidence for ψ2(3823)→γχc2 is found with a significance of 3.2σ for the first time. The branching-fraction ratio B(ψ2(3823)→γχc2)B(ψ2(3823)→γχc1) is determined. No significant ψ2(3823) signals are observed for any of the other decay channels. Upper limits of branching-fraction ratios for ψ2(3823)→π+π-J/ψ, π0π0J/ψ, ηJ/ψ, π0J/ψ, γχc0 relative to ψ2(3823)→γχc1 are reported. The process e+e-→π0π0ψ2(3823) is also searched for, and we find evidence for the process with a significance of 4.3σ. The average cross-section ratio σ(e+e-→π0π0ψ2(3823))σ(e+e-→π+π-ψ2(3823)) is also determined.

Original languageEnglish
Article numberL091102
JournalPhysical Review D
Volume103
Issue number9
DOIs
Publication statusPublished - 19 May 2021

OECD FOS+WOS

  • 1.03 PHYSICAL SCIENCES AND ASTRONOMY
  • 1.03.BU ASTRONOMY & ASTROPHYSICS
  • 1.03.UP PHYSICS, PARTICLES & FIELDS

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