Observation of ψ ( 3686 ) → γ η ( 1405 ) via η ( 1405 ) → f 0 ( 980 ) π 0

M. Ablikim; Mikhail N. Achasov; P. Adlarson; X. C. Ai; R. Aliberti; A. Amoroso; Q. An; Yunhao Bai; Olga Bakina; Y. Ban; H. -R. Bao; V. Batozskaya; K. Begzsuren; N. Berger; Marcin Berlowski; M. Bertani; D. Bettoni; F. Bianchi; E. Bianco; A. Bortone; I. R. Boyko; Roy A. Briere; A. Brueggemann; H. Cai; M. H. Cai; Xiaodie Cai; Alessandro Calcaterra; G. F. Cao; Ning Cao; S. A. Cetin; X. Y. Chai; J. F. Chang; G. R.; Yuzhi Che; C. H. Chen; Chao Chen; G. Chen; H. S. Chen; H. Y. Chen; M. L. Chen; S. J. Chen; S. L. Chen; Shaomin Chen; T. Chen; Xurong Chen; X. T. Chen; X. Y. Chen; Yuanbo Chen; Y. Q. Chen; Y. Q. Chen; Z. Chen; Zhuojun Chen; Z. K. Chen; S. K. Choi; X. Chu; G. Cibinetto; F. Cossio; J. Cottee-Meldrum; J. J. Cui; H. L. Dai; J. P. Dai; A. Dbeyssi; R. E. de Boer; D. V. Dedovich; C. Q. Deng; Z. Y. Deng; A. Denig; I. Denisenko; M. Destefanis; F. De Mori; B. Ding; X. X. Ding; Y. Ding; Y. Ding; Y. X. Ding; J. Dong; L. Y. Dong; M. Y. Dong; Xiangyang Dong; M. C. Du; S. X. Du; S. X. Du; Y. Y. Duan; P. Egorov; G. F. Fan; J. J. Fan; Y. H. Fan; Jian Fang; J. Fang; S. S. Fang; W. X. Fang; Y. Q. Fang; R. Farinelli; L. Fava; F. Feldbauer; G. Felici; C. Q. Feng; J. H. Feng; L. Feng; Qichun Feng

doi:10.1103/pchp-d1x8

Observation of ψ ( 3686 ) → γ η ( 1405 ) via η ( 1405 ) → f 0 ( 980 ) π 0

Physical review. D/Physical review. D. 2026 Open access

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Authors: M. Ablikim, Mikhail N. Achasov, P. Adlarson, X. C. Ai, R. Aliberti, A. Amoroso, Q. An, Yunhao Bai, Olga Bakina, Y. Ban, H. -R. Bao, V. Batozskaya

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K. Begzsuren, N. Berger, Marcin Berlowski, M. Bertani, D. Bettoni, F. Bianchi, E. Bianco, A. Bortone, I. R. Boyko, Roy A. Briere, A. Brueggemann, H. Cai, M. H. Cai, Xiaodie Cai, Alessandro Calcaterra, G. F. Cao, Ning Cao, S. A. Cetin, X. Y. Chai, J. F. Chang, G. R., Yuzhi Che, C. H. Chen, Chao Chen, G. Chen, H. S. Chen, H. Y. Chen, M. L. Chen, S. J. Chen, S. L. Chen, Shaomin Chen, T. Chen, Xurong Chen, X. T. Chen, X. Y. Chen, Yuanbo Chen, Y. Q. Chen, Y. Q. Chen, Z. Chen, Zhuojun Chen, Z. K. Chen, S. K. Choi, X. Chu, G. Cibinetto, F. Cossio, J. Cottee-Meldrum, J. J. Cui, H. L. Dai, J. P. Dai, A. Dbeyssi, R. E. de Boer, D. V. Dedovich, C. Q. Deng, Z. Y. Deng, A. Denig, I. Denisenko, M. Destefanis, F. De Mori, B. Ding, X. X. Ding, Y. Ding, Y. Ding, Y. X. Ding, J. Dong, L. Y. Dong, M. Y. Dong, Xiangyang Dong, M. C. Du, S. X. Du, S. X. Du, Y. Y. Duan, P. Egorov, G. F. Fan, J. J. Fan, Y. H. Fan, Jian Fang, J. Fang, S. S. Fang, W. X. Fang, Y. Q. Fang, R. Farinelli, L. Fava, F. Feldbauer, G. Felici, C. Q. Feng, J. H. Feng, L. Feng, Qichun Feng

DOI: 10.1103/pchp-d1x8

Cited by: 0

References: 46

Abstract

The decay ψ ( 3686 ) → γ π + π − π 0 is studied using a sample of ( 2712.4 ± 14.3 ) × 10 6 ψ ( 3686 ) events collected with the BESIII detector. The decay η ( 1405 ) → π + π − π 0 is observed for the first time in ψ ( 3686 ) decays via the intermediate state f 0 ( 980 ) and the product branching fraction B ( ψ ( 3686 ) → γ η ( 1405 ) ) × B ( η ( 1405 ) → f 0 ( 980 ) π 0 ) × B ( f 0 ( 980 ) → π + π − ) is determined to be ( 3.77 ± 0.43 ± 0.30 ) × 10 − 7 , where the first uncertainty is statistical and the second is systematic. The branching fraction of isospin-violating decay ψ ( 3686 ) → γ f 1 ( 1285 ) → γ f 0 ( 980 ) π 0 → γ π + π − π 0 is determined to be ( 7.36 ± 2.25 ± 2.36 ) ×

Fields of Study & Subjects

Quantum Chromodynamics and Particle Interactions Particle physics theoretical and experimental studies Nuclear physics research studies

Publication details

Journal / source: Physical review. D/Physical review. D.
Volume: 113
Issue: 3
Publication date: 2 January 2026
Language: EN

References 46