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.

Measurements of the Branching Fraction, Polarization, and CP Asymmetry for the Decay B0 →ωω / Guan, Y., Schwartz, A.J., Kinoshita, K., Adachi, I., Aihara, H., Al Said, S., Asner, D.M., Atmacan, H., Ayad, R., Bahinipati, S., Banerjee, S., Belous, K., Bennett, J., Bessner, M., Bhardwaj, V., Bhuyan, B., Biswas, D., Bobrov, A., Bodrov, D., Borah, J., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 133:8(2024). [10.1103/PhysRevLett.133.081801]

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

Campajola M.;De Nardo G.;Di Capua F.;Merola M.;Pardi S.;
2024

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.
2024
Measurements of the Branching Fraction, Polarization, and CP Asymmetry for the Decay B0 →ωω / Guan, Y., Schwartz, A.J., Kinoshita, K., Adachi, I., Aihara, H., Al Said, S., Asner, D.M., Atmacan, H., Ayad, R., Bahinipati, S., Banerjee, S., Belous, K., Bennett, J., Bessner, M., Bhardwaj, V., Bhuyan, B., Biswas, D., Bobrov, A., Bodrov, D., Borah, J., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 133:8(2024). [10.1103/PhysRevLett.133.081801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/985078
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