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.
2024
2024
8
0
33
B Physics; Branching fraction; e+-e− Experiments; Particle and Resonance Production
null, null; Adachi, I.; Aggarwal, L.; Aihara, H.; Akopov, N.; Aloisio, A.; Althubiti, N.; Anh Ky, N.; Asner, D. M.; Atmacan, H.; Aushev, T.; Aushev, V...espandi
File in questo prodotto:
File Dimensione Formato  
JHEP08(2024)206.pdf

Accesso aperto

Tipo di file: PDF EDITORIALE
Dimensione 1.58 MB
Formato Adobe PDF
1.58 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2069442
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 0
social impact