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 Bbar → D(*)K−K_(S)^(*)0 and Bbar → D(*)D_s^- decays at Belle II
Bianchi, F.;Biswas, D.;Boschetti, A.;Destefanis, M.;Maggiora, M.;Marcello, S.;Mussa, R.;Pinna Angioni, G.;Spataro, S.;Tamponi, U.;
2024-01-01
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.| File | Dimensione | Formato | |
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JHEP08(2024)206.pdf
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