We present measurements of the branching fractions of eight B¯0 → D(*)+K−KS∗0, B− → D(*)0K−KS∗0 decay channels. The results are based on data from SuperKEKB electron-positron collisions at the Υ(4S) resonance collected with the Belle II detector, corresponding to an integrated luminosity of 362 fb−1. The event yields are extracted from fits to the distributions of the difference between expected and observed B meson energy, and are efficiency-corrected as a function of m(K−KS∗0) and m(D(*)KS∗0) in order to avoid dependence on the decay model. These results include the first observation of B¯0 → D+K−KS0, B− → D*0K−KS0, and B¯0 → D*+K−KS0 decays and a significant improvement in the precision of the other channels compared to previous measurements. The helicity-angle distributions and the invariant mass distributions of the K−KS∗0 systems are compatible with quasi-two-body decays via a resonant transition with spin-parity JP = 1− for the K−KS0 systems and JP = 1+ for the K−K*0 systems. We also present measurements of the branching fractions of four B¯0 → D(*)+Ds−, B− → D(*)0Ds− decay channels with a precision compatible to the current world averages.

Measurement of the branching fractions of B¯ → D(*)K−KS∗0 and B¯ → D(*)Ds− decays at Belle II / Adachi, I., Aggarwal, L., 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., Bahinipati, S., Bambade, P., Banerjee, S., Bansal, S., Barrett, M., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2024:8(2024). [10.1007/JHEP08(2024)206]

Measurement of the branching fractions of B¯ → D(*)K−KS∗0 and B¯ → D(*)Ds− decays at Belle II

Aloisio A.;Campajola M.;De Nardo G.;Di Capua F.;Gaudino G.;Giordano R.;Merola M.;Mirra M.;Pardi S.;
2024

Abstract

We present measurements of the branching fractions of eight B¯0 → D(*)+K−KS∗0, B− → D(*)0K−KS∗0 decay channels. The results are based on data from SuperKEKB electron-positron collisions at the Υ(4S) resonance collected with the Belle II detector, corresponding to an integrated luminosity of 362 fb−1. The event yields are extracted from fits to the distributions of the difference between expected and observed B meson energy, and are efficiency-corrected as a function of m(K−KS∗0) and m(D(*)KS∗0) in order to avoid dependence on the decay model. These results include the first observation of B¯0 → D+K−KS0, B− → D*0K−KS0, and B¯0 → D*+K−KS0 decays and a significant improvement in the precision of the other channels compared to previous measurements. The helicity-angle distributions and the invariant mass distributions of the K−KS∗0 systems are compatible with quasi-two-body decays via a resonant transition with spin-parity JP = 1− for the K−KS0 systems and JP = 1+ for the K−K*0 systems. We also present measurements of the branching fractions of four B¯0 → D(*)+Ds−, B− → D(*)0Ds− decay channels with a precision compatible to the current world averages.
2024
Measurement of the branching fractions of B¯ → D(*)K−KS∗0 and B¯ → D(*)Ds− decays at Belle II / Adachi, I., Aggarwal, L., 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., Bahinipati, S., Bambade, P., Banerjee, S., Bansal, S., Barrett, M., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2024:8(2024). [10.1007/JHEP08(2024)206]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/985075
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