Measurement of the B0 lifetime and flavor-oscillation frequency using hadronic decays reconstructed in 2019-2021 Belle II data

F Abudinén; I Adachi; L Aggarwal; H Ahmed; H Aihara; N Akopov; A Aloisio; N Anh Ky; DM Asner; H Atmacan; T Aushev; V Aushev; H Bae; S Bahinipati; P Bambade; S Banerjee; S Bansal; M Barrett; J Baudot; M Bauer; A Baur; A Beaubien; J Becker; JV Bennett; E Bernieri; FU Bernlochner; V Bertacchi; M Bertemes; E Bertholet; M Bessner; S Bettarini; V Bhardwaj; B Bhuyan; F Bianchi; T Bilka; S Bilokin; D Biswas; A Bobrov; D Bodrov; J Borah; A Bozek; M Bračko; RA Briere; TE Browder; A Budano; S Bussino; M Campajola; L Cao; G Casarosa; C Cecchi; J Cerasoli; P Chang; P Cheema; V Chekelian; C Chen; BG Cheon; K Chilikin; K Chirapatpimol; HE Cho; K Cho; SJ Cho; SK Choi; S Choudhury; J Cochran; L Corona; S Cunliffe; 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; A De Yta-Hernandez; R Dhamija; A Di Canto; F Di Capua; J Dingfelder; Z DoleŽal; I Domínguez Jiménez; TV Dong; M Dorigo; K Dort; D Dossett; S Dreyer; S Dubey; G Dujany; P Ecker; M Eliachevitch; D Epifanov; P Feichtinger; T Ferber; D Ferlewicz; T Fillinger; G Finocchiaro; A Fodor; F Forti; A Frey

Journal article

Measurement of the B0 lifetime and flavor-oscillation frequency using hadronic decays reconstructed in 2019-2021 Belle II data

F Abudinén, I Adachi, L Aggarwal, H Ahmed, H Aihara, N Akopov, A Aloisio, N Anh Ky, DM Asner, H Atmacan, T Aushev, V Aushev, H Bae, S Bahinipati, P Bambade, S Banerjee, S Bansal, M Barrett, J Baudot, M Bauer Show all

Physical Review D | American Physical Society (APS) | Published : 2023

DOI: 10.1103/PhysRevD.107.L091102

Abstract

We measure the B0 lifetime and flavor-oscillation frequency using B0→D(∗)-π+ decays collected by the Belle II experiment in asymmetric-energy e+e- collisions produced by the SuperKEKB collider operating at the ϒ(4S) resonance. We fit the decay-time distribution of signal decays, where the initial flavor is determined by identifying the flavor of the other B meson in the event. The results, based on 33000 signal decays reconstructed in a data sample corresponding to 190 fb-1, are τB0=(1.499±0.013±0.008) ps, Δmd=(0.516±0.008±0.005) ps-1, where the first uncertainties are statistical and the second are systematic. These results are consistent with the world-average values.