Measurement of the branching fraction of the decay B- →d0ρ (770)- at Belle II

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

Journal article

Measurement of the branching fraction of the decay B- →d0ρ (770)- at Belle II

I Adachi, L Aggarwal, H Aihara, N Akopov, A Aloisio, N Anh Ky, DM Asner, H Atmacan, V Aushev, M Aversano, R Ayad, V Babu, H Bae, S Bahinipati, P Bambade, S Banerjee, S Bansal, M Barrett, J Baudot, A Baur Show all

Physical Review D | American Physical Society (APS) | Published : 2024

DOI: 10.1103/PhysRevD.109.L111103

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Abstract

We measure the branching fraction of the decay B-→D0ρ(770)- using data collected with the Belle II detector. The data contain 387 million BB¯ pairs produced in e+e- collisions at the ϒ(4S) resonance. We reconstruct 8360±180 decays from an analysis of the distributions of the B- energy and the ρ(770)- helicity angle. We determine the branching fraction to be (0.939±0.021(stat)±0.050(syst))%, in agreement with previous results. Our measurement improves the relative precision of the world average by more than a factor of two.