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 (US)
Article numberL091102
JournalPhysical Review D
Volume103
Issue number9
DOIs
StatePublished - May 19 2021

Bibliographical note

Funding Information:
The BESIII Collaboration thanks the staff of BEPCII and the IHEP computing center for their strong support. This work is supported in part by National Key Research and Development Program of China under Contracts No. 2020YFA0406300 and No. 2020YFA0406400; National Natural Science Foundation of China (NSFC) under Contracts No. 11905179, No. 11625523, No. 11635010, No. 11735014, No. 11822506, No. 11835012, No. 11935015, No. 11935016, No. 11935018, and No. 11961141012; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. U1732263 and No. U1832207; CAS Key Research Program of Frontier Sciences under Contracts No. QYZDJ-SSW-SLH003 and No. QYZDJ-SSW-SLH040; 100 Talents Program of CAS; INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; European Union Horizon 2020 research and innovation program under Marie Skłodowska-Curie Grant Agreement No. 894790; Nanhu Scholars Program for Young Scholars of Xinyang Normal University; German Research Foundation DFG under Contracts No. 443159800, Collaborative Research Center No. CRC 1044, No. FOR 2359, No. FOR 2359, and No. GRK 214; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Science and Technology fund; Olle Engkvist Foundation under Contract No. 200-0605; STFC (United Kingdom); The Knut and Alice Wallenberg Foundation (Sweden) under Contract No. 2016.0157; The Royal Society, United Kingdom under Contracts No. DH140054 and No. DH160214; The Swedish Research Council; and U.S. Department of Energy under Contracts No. DE-FG02-05ER41374 and No. DE-SC-0012069.

Publisher Copyright:
© 2021 authors. Published by the American Physical Society.

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