Measurements of the Branching Fraction, Polarization, and CP Asymmetry for the Decay B0 →ωω

Y Guan; AJ Schwartz; K Kinoshita; I Adachi; H Aihara; S Al Said; DM Asner; H Atmacan; R Ayad; S Bahinipati; S Banerjee; K Belous; J Bennett; M Bessner; V Bhardwaj; B Bhuyan; D Biswas; A Bobrov; D Bodrov; J Borah; A Bozek; M Bračko; P Branchini; TE Browder; A Budano; M Campajola; L Cao; D Červenkov; MC Chang; P Chang; BG Cheon; K Chilikin; HE Cho; K Cho; SK Choi; Y Choi; S Choudhury; S Das; G De Nardo; G De Pietro; R Dhamija; F Di Capua; J Dingfelder; Z DoleŽal; TV Dong; S Dubey; P Ecker; D Epifanov; T Ferber; D Ferlewicz; BG Fulsom; V Gaur; A Giri; P Goldenzweig; E Graziani; T Gu; K Gudkova; C Hadjivasiliou; K Hayasaka; H Hayashii; S Hazra; MT Hedges; WS Hou; CL Hsu; N Ipsita; A Ishikawa; R Itoh; M Iwasaki; WW Jacobs; S Jia; Y Jin; KK Joo; T Kawasaki; CH Kim; DY Kim; KH Kim; YJ Kim; YK Kim; P Kodyš; A Korobov; S Korpar; E Kovalenko; P KriŽan; P Krokovny; T Kuhr; R Kumar; K Kumara; T Kumita; YJ Kwon; YT Lai; SC Lee; D Levit; LK Li; Y Li; YB Li; L Li Gioi; J Libby; D Liventsev; T Luo; M Masuda

Journal article

Measurements of the Branching Fraction, Polarization, and CP Asymmetry for the Decay B0 →ωω

Y Guan, AJ Schwartz, K Kinoshita, I Adachi, H Aihara, S Al Said, DM Asner, H Atmacan, R Ayad, S Bahinipati, S Banerjee, K Belous, J Bennett, M Bessner, V Bhardwaj, B Bhuyan, D Biswas, A Bobrov, D Bodrov, J Borah Show all

Physical Review Letters | Published : 2024

DOI: 10.1103/PhysRevLett.133.081801

Abstract

We present a comprehensive study of B0→ωω decays using 772×106 BB¯ pairs collected with the Belle detector at the KEKB e+e- collider. This process is a suppressed charmless decay into two vector mesons and can exhibit interesting polarization and CP violation. The decay is observed for the first time with a significance of 7.9 standard deviations. We measure a branching fraction B=(1.53±0.29±0.17)×10-6, a fraction of longitudinal polarization fL=0.87±0.13±0.13, and a time-integrated CP asymmetry ACP=-0.44±0.43±0.11, where the first uncertainties listed are statistical and the second are systematic. This is the first observation of B0→ωω and the first measurements of fL and ACP for this decay..

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