Measurements of the branching fractions of,, and at Belle and Belle II

I Adachi; JK Ahn; Y Ahn; N Akopov; S Alghamdi; M Alhakami; N Althubiti; K Amos; N Anh Ky; C Antonioli; DM Asner; M Aversano; R Ayad; V Babu; NK Baghel; P Bambade; S Banerjee; M Barrett; M Bartl; J Baudot; A Beaubien; F Becherer; J Becker; JV Bennett; V Bertacchi; M Bertemes; E Bertholet; M Bessner; S Bettarini; B Bhuyan; F Bianchi; D Biswas; D Bodrov; A Bondar; G Bonvicini; A Boschetti; A Bozek; M Bračko; P Branchini; RA Briere; A Budano; S Bussino; Q Campagna; M Campajola; L Cao; G Casarosa; C Cecchi; MC Chang; P Cheema; BG Cheon; K Chilikin; J Chin; K Chirapatpimol; HE Cho; K Cho; SJ Cho; SK Choi; S Choudhury; J Cochran; I Consigny; L Corona; JX Cui; E De La Cruz-Burelo; SA De La Motte; G De Pietro; R de Sangro; M Destefanis; S Dey; A Di Canto; J Dingfelder; Z Doležal; I Domínguez Jiménez; TV Dong; M Dorigo; G Dujany; P Ecker; P Feichtinger; T Ferber; T Fillinger; C Finck; G Finocchiaro; A Fodor; F Forti; BG Fulsom; A Gabrielli; A Gale; M Garcia-Hernandez; R Garg; G Gaudino; V Gaur; V Gautam; A Gaz; A Gellrich; D Ghosh; H Ghumaryan; R Giordano; A Giri; P Gironella Gironell; A Glazov; B Gobbo

Journal article

Measurements of the branching fractions of,, and at Belle and Belle II

I Adachi, JK Ahn, Y Ahn, N Akopov, S Alghamdi, M Alhakami, N Althubiti, K Amos, N Anh Ky, C Antonioli, DM Asner, M Aversano, R Ayad, V Babu, NK Baghel, P Bambade, S Banerjee, M Barrett, M Bartl, J Baudot Show all

Journal of High Energy Physics | Springer Science and Business Media LLC | Published : 2025

DOI: 10.1007/JHEP08(2025)195

Abstract

Using 983.0 fb−1 and 427.9 fb−1 data samples collected with the Belle and Belle II detectors at the KEKB and SuperKEKB asymmetric energy e+e− colliders, respectively, we present studies of the Cabibbo-favored decays and, and the singly Cabibbo-suppressed decay. The ratios of branching fractions of and relative to that of are measured for the first time, while the ratio is also determined and improved by an order of magnitude in precision. The measured branching fraction ratios are Additionally, the ratio is measured to be 0.068 ± 0.010 ± 0.004. Here, the first and second uncertainties are statistical and systematic, respectively. Multiplying the ratios by the branching fraction of the normal..

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