Observation of the Radiative Decay Ds0∗ (2317) → Ds∗ γ

M Abumusabh; I Adachi; L Aggarwal; H Ahmed; Y Ahn; H Aihara; N Akopov; S Alghamdi; M Alhakami; A Aloisio; N Althubiti; K Amos; N Anh Ky; C Antonioli; DM Asner; H Atmacan; T Aushev; R Ayad; V Babu; NK Baghel; S Bahinipati; P Bambade; S Banerjee; M Barrett; M Bartl; J Baudot; A Beaubien; J Becker; JV Bennett; FU Bernlochner; V Bertacchi; M Bertemes; E Bertholet; M Bessner; S Bettarini; F Bianchi; T Bilka; D Biswas; A Bobrov; D Bodrov; A Bondar; G Bonvicini; J Borah; A Boschetti; A Bozek; M Bračko; P Branchini; RA Briere; TE Browder; A Budano; S Bussino; Q Campagna; M Campajola; G Casarosa; C Cecchi; P Chang; P Cheema; L Chen; BG Cheon; C Cheshta; H Chetri; K Chilikin; K Chirapatpimol; HE Cho; K Cho; SJ Cho; SK Choi; S Choudhury; S Chutia; JA Colorado-Caicedo; I Consigny; L Corona; JX Cui; E De La Cruz-Burelo; SA De La Motte; G De Nardo; G De Pietro; R De Sangro; M Destefanis; S Dey; A Di Canto; Z DoleŽal; I Domínguez Jiménez; TV Dong; X Dong; M Dorigo; G Dujany; P Ecker; J Eppelt; R Farkas; P Feichtinger; T Ferber; T Fillinger; C Finck; G Finocchiaro; F Forti; BG Fulsom; A Gabrielli; E Ganiev; M Garcia-Hernandez

Journal article

Observation of the Radiative Decay Ds0∗ (2317) → Ds∗ γ

M Abumusabh, I Adachi, L Aggarwal, H Ahmed, Y Ahn, H Aihara, N Akopov, S Alghamdi, M Alhakami, A Aloisio, N Althubiti, K Amos, N Anh Ky, C Antonioli, DM Asner, H Atmacan, T Aushev, R Ayad, V Babu, NK Baghel Show all

Physical Review Letters | American Physical Society (APS) | Published : 2026

DOI: 10.1103/vcld-225s

Open access

Abstract

We report the first observation of the radiative decay Ds0∗(2317)+→ Ds∗+γ with a statistical significance exceeding 10 standard deviations. The signal is observed in the continuum e+e-→cc¯ process, using combined data samples of 980.4 fb-1 from Belle and 427.9 fb-1 from Belle II, collected at the KEKB and SuperKEKB asymmetric-energy e+e- colliders, respectively. The branching fraction ratio B[Ds0∗(2317)+→Ds∗+γ]/B[Ds0∗(2317)+→Ds+π0] is measured to be [7.13±0.70(stat)±0.26(syst)]%. This result provides crucial discrimination between theoretical models of the Ds0∗(2317)+ structure.