Measurement of the hyperon weak radiative decay Ξ0 → γΣ0 at BESIII

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

doi:10.1007/jhep08(2026)017

Measurement of the hyperon weak radiative decay Ξ0 → γΣ0 at BESIII

Journal of High Energy Physics 2026 Open access

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

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K. Begzsuren, N. Berger, M. Berlowski, M. B. Bertani, D. Bettoni, F. Bianchi, E. Bianco, A. Bortone, Igor R. Boyko, Roy A. Briere, A. Brueggemann, Hao Ming Cai, M. H. Cai, Hengxing Cai, Alessandro Calcaterra, G. F. Cao, G. F. Cao, Serkant Ali Cetin, Xuedong Chai, Jin Chang, G. R. Che, Yuzhi Che, G. R. Che, Chao Chen, C. Chen, Chao Chen, G. Chen, H. S. Chen, M. L. Chen, S. J. Chen, S. L. Chen, S. M. Chen, T. Chen, X. R. Chen, X. T. Chen, Y. B. Chen, Y. Q. Chen, Z. J. Chen, W. S. Cheng, Zhuojun Chen, Z. K. Chen, S.-K. Choi, X. Chu, G. Cibinetto, F. Cossio, J. J. Cottee Meldrum, J. P. Dai, H. L. Dai, J. P. Dai, A. Dbeyssi, R. E. de Boer, Dmitri Dedovich, C. Q. Deng, Z. Y. Deng, A. G. Denig, I. Denisenko, M. Destefanis, F. De Mori, Y. Ding, J. Dong, L. Y. Dong, M. Y. Dong, X. Dong, Junyue Dong, L. Y. Dong, M. Y. Dong, X. Dong, M. C. Du, S. X. Du, S. X. Du, Yunyou Duan, P. Egorov, G. F. Fan, J. J. Fan, Y. H. Fan, Jian Fang, C. Q. Feng, J. H. Feng, Wenxing Fang, Y. Fang, R. Farinelli, L. Fava, F. Feldbauer, G. Felici, C. Q. Feng, J. H. Feng, L. Feng, Qichun Feng

DOI: 10.1007/jhep08(2026)017

Cited by: 0

References: 40

Abstract

A bstract The hyperon weak radiative decay Ξ 0 → γ Σ 0 is measured using a sample of Ξ 0 from $$ J/\psi \to {\Xi}^0{\overline{\Xi}}^0 $$ J / ψ → Ξ 0 Ξ ¯ 0 decays. The absolute branching fraction of Ξ 0 → γ Σ 0 is determined to be (3 . 66 ± 0 . 21 stat ± 0 . 10 syst ) × 10 − 3 , based on (10 . 087 ± 0 . 044) × 10 9 J/ψ events collected with the BESIII detector operating at the BEPCII collider. The decay asymmetry parameter is measured, with a complete angular analysis of the cascade decay chain, to be α γ = − 0 . 807 ± 0 . 095 stat ± 0 . 011 syst .

Fields of Study & Subjects

Quantum Chromodynamics and Particle Interactions Particle physics theoretical and experimental studies High-Energy Particle Collisions Research

Publication details

Journal / source: Journal of High Energy Physics
Publisher: Springer Science and Business Media LLC
Volume: 2026
Issue: 8
Publication date: 3 August 2026
Language: EN

References 40