We present measurements of B → K*(892)γ decays using 365 fb−1 of data collected from 2019 to 2022 by the Belle II experiment at the SuperKEKB asymmetric-energy e+e− collider. The data sample contains (387 ± 6) × 106 Υ(4S) events. We measure branching fractions () and CP asymmetries () for both B0→ K*0γ and B+→ K*+γ decays. The difference in CP asymmetries () and the isospin asymmetry (∆0+) between these neutral and charged channels are also measured. We obtain the following branching fractions and CP asymmetries:,,, and. The measured difference in CP asymmetries is, and the measured isospin asymmetry is ∆0+ = (+4.8 ± 2.0 ± 1.8)%. The first uncertainties listed are statistical and the second are systematic. These results are consistent with world-average values and theory predictions.

Measurement of B → K*(892)γ decays at Belle II / Adachi, I., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., Althubiti, N., Anh Ky, N., Asner, D.M., Atmacan, H., Aushev, T., Aushev, V., Aversano, M., Ayad, R., Babu, V., Bae, H., Baghel, N.K., Bahinipati, S., Bambade, P., Banerjee, S., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2025:9(2025). [10.1007/JHEP09(2025)024]

Measurement of B → K*(892)γ decays at Belle II

Aloisio A.;Campajola M.;De Nardo G.;Di Capua F.;Gaudino G.;Giordano R.;Merola M.;Mirra M.;Pardi S.;
2025

Abstract

We present measurements of B → K*(892)γ decays using 365 fb−1 of data collected from 2019 to 2022 by the Belle II experiment at the SuperKEKB asymmetric-energy e+e− collider. The data sample contains (387 ± 6) × 106 Υ(4S) events. We measure branching fractions () and CP asymmetries () for both B0→ K*0γ and B+→ K*+γ decays. The difference in CP asymmetries () and the isospin asymmetry (∆0+) between these neutral and charged channels are also measured. We obtain the following branching fractions and CP asymmetries:,,, and. The measured difference in CP asymmetries is, and the measured isospin asymmetry is ∆0+ = (+4.8 ± 2.0 ± 1.8)%. The first uncertainties listed are statistical and the second are systematic. These results are consistent with world-average values and theory predictions.
2025
Measurement of B → K*(892)γ decays at Belle II / Adachi, I., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., Althubiti, N., Anh Ky, N., Asner, D.M., Atmacan, H., Aushev, T., Aushev, V., Aversano, M., Ayad, R., Babu, V., Bae, H., Baghel, N.K., Bahinipati, S., Bambade, P., Banerjee, S., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2025:9(2025). [10.1007/JHEP09(2025)024]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/1011943
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