Test of lepton flavor universality with measurements of RðD Þ and RðD* Þ using semileptonic B tagging at the Belle II experiment

I Adachi; K Adamczyk; L Aggarwal; H Ahmed; H Aihara; N Akopov; S Alghamdi; M Alhakami; A Aloisio; N Althubiti; K Amos; M Angelsmark; N Anh Ky; C Antonioli; DM Asner; H Atmacan; T Aushev; V Aushev; M Aversano; R Ayad; V Babu; H Bae; NK Baghel; S Bahinipati; P Bambade; S Banerjee; S Bansal; M Barrett; M Bartl; J Baudot; A Beaubien; F Becherer; J Becker; JV Bennett; FU Bernlochner; V Bertacchi; M Bertemes; E Bertholet; M Bessner; S Bettarini; V Bhardwaj; B Bhuyan; F Bianchi; T Bilka; D Biswas; A Bobrov; D Bodrov; A Bolz; A Bondar; J Borah; A Boschetti; A Bozek; M Bračko; P Branchini; RA Briere; TE Browder; A Budano; S Bussino; Q Campagna; M Campajola; L Cao; G Casarosa; C Cecchi; J Cerasoli; MC Chang; P Chang; R Cheaib; 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 Nardo; G De Pietro; R de Sangro; M Destefanis; S Dey; R Dhamija; F Di Capua; J Dingfelder; Z Doležal; ID Jiménez; TV Dong; M Dorigo; D Dossett; S Dubey; K Dugic; G Dujany; P Ecker

Journal article

Test of lepton flavor universality with measurements of RðD Þ and RðD* Þ using semileptonic B tagging at the Belle II experiment

I Adachi, K Adamczyk, L Aggarwal, H Ahmed, H Aihara, N Akopov, S Alghamdi, M Alhakami, A Aloisio, N Althubiti, K Amos, M Angelsmark, N Anh Ky, C Antonioli, DM Asner, H Atmacan, T Aushev, V Aushev, M Aversano, R Ayad Show all

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

DOI: 10.1103/fmn3-h8fy

Abstract

We report measurements of the ratios of branching fractions (Formula presented), where (Formula presented) denotes either an electron or a muon. These ratios test the universality of the charged-current weak interaction. The results are based on a 365 fb−1 data sample collected with the Belle II detector at the SuperKEKB eþe− collider, which operates at a center-of-mass energy corresponding to the (Formula presented) resonance, just above the threshold for BB̄ production. Signal candidates are reconstructed by selecting events in which the companion B meson from the (Formula presented) decay is identified in semileptonic modes. The τ lepton is reconstructed via its leptonic decays. We obtain..

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