Measurement of CP asymmetries in B0 →η′ KS0 decays at Belle II

I Adachi; L Aggarwal; H Ahmed; H Aihara; N Akopov; A Aloisio; N Anh Ky; DM Asner; H Atmacan; T Aushev; V Aushev; M Aversano; V Babu; H Bae; S Bahinipati; P Bambade; S Banerjee; M Barrett; J Baudot; A Baur; A Beaubien; F Becherer; J Becker; JV Bennett; FU Bernlochner; V Bertacchi; M Bertemes; E Bertholet; M Bessner; S Bettarini; B Bhuyan; F Bianchi; T Bilka; S Bilokin; D Biswas; A Bobrov; D Bodrov; A Bolz; A Bondar; J Borah; 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 Chang; P Cheema; C Chen; BG Cheon; K Chilikin; K Chirapatpimol; HE Cho; K Cho; SJ Cho; SK Choi; S Choudhury; L Corona; S Das; F Dattola; E De La Cruz-Burelo; SA De La Motte; G De Nardo; M De Nuccio; G De Pietro; R De Sangro; M Destefanis; R Dhamija; A Di Canto; F Di Capua; J Dingfelder; Z DoleŽal; TV Dong; M Dorigo; K Dort; S Dreyer; S Dubey; G Dujany; P Ecker; M Eliachevitch; P Feichtinger; T Ferber; D Ferlewicz; 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 CP asymmetries in B0 →η′ KS0 decays at Belle II

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

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

DOI: 10.1103/PhysRevD.110.112002

Abstract

We describe a measurement of charge-parity (CP) violation asymmetries in B0→η′KS0 decays using Belle II data. We consider η′→η(→γγ)π+π- and η′→ρ(→π+π-)γ decays. The data were collected at the SuperKEKB asymmetric-energy e+e- collider between the years 2019 and 2022, and contain (387±6)×106 bottom-antibottom meson pairs. We reconstruct 829±35 signal decays and extract the CP violating parameters from a fit to the distribution of the proper-decay-time difference between the two B mesons. The measured direct and mixing-induced CP asymmetries are Cη′KS0=-0.19±0.08±0.03 and Sη′KS0=+0.67±0.10±0.03, respectively, where the first uncertainties are statistical and the second are systematic. These res..

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