Observation of the decay B0 →j/ψω at Belle II

I Adachi; L Aggarwal; H Ahmed; H Aihara; N Akopov; M Alhakami; A Aloisio; N Althubiti; N Anh Ky; DM Asner; H Atmacan; V Aushev; M Aversano; R Ayad; V Babu; NK Baghel; S Bahinipati; P Bambade; S Banerjee; M Barrett; J Baudot; A Baur; A Beaubien; J Becker; JV Bennett; V Bertacchi; M Bertemes; E Bertholet; M Bessner; S Bettarini; B Bhuyan; F Bianchi; D Biswas; A Bobrov; D Bodrov; A Bolz; A Bondar; J Borah; A Boschetti; A Bozek; M Bračko; P Branchini; N Brenny; RA Briere; TE Browder; A Budano; S Bussino; Q Campagna; M Campajola; G Casarosa; C Cecchi; J Cerasoli; MC Chang; R Cheaib; P Cheema; C Chen; BG Cheon; K Chilikin; K Chirapatpimol; HE Cho; K Cho; SJ Cho; SK Choi; S Choudhury; J Cochran; L Corona; JX Cui; E De La Cruz-Burelo; SA De La Motte; G De Marino; G De Nardo; G De Pietro; R De Sangro; M Destefanis; S Dey; A Di Canto; F Di Capua; J Dingfelder; Z DoleŽal; I Domínguez Jiménez; TV Dong; X Dong; M Dorigo; D Dossett; K Dugic; G Dujany; P Ecker; D Epifanov; J Eppelt; P Feichtinger; T Ferber; T Fillinger; C Finck; G Finocchiaro; A Fodor; F Forti; BG Fulsom; A Gabrielli; E Ganiev; M Garcia-Hernandez

Journal article

Observation of the decay B0 →j/ψω at Belle II

I Adachi, L Aggarwal, H Ahmed, H Aihara, N Akopov, M Alhakami, A Aloisio, N Althubiti, N Anh Ky, DM Asner, H Atmacan, V Aushev, M Aversano, R Ayad, V Babu, NK Baghel, S Bahinipati, P Bambade, S Banerjee, M Barrett Show all

Physical Review D | American Physical Society (APS) | Published : 2025

DOI: 10.1103/PhysRevD.111.032012

Abstract

We measure the branching fraction of the decay B0→J/ψω using data collected with the Belle II detector at the SuperKEKB collider. The data contain (387±6)×106 BB¯ meson pairs produced in energy-asymmetric e+e- collisions at the δ(4S) resonance. The measured branching fraction B(B0→J/ψω)=(2.16±0.30±0.14)×10-5, where the first uncertainty is statistical and the second is systematic, is more precise than previous results and constitutes the first observation of the decay with a significance of 6.5 standard deviations.