We measure the branching fraction of the decay B0→J/ψω using data collected with the Belle II detector at the SuperKEKB collider. The data contain (387±6)×106 BB¯ meson pairs produced in energy-asymmetric e+e- collisions at the δ(4S) resonance. The measured branching fraction B(B0→J/ψω)=(2.16±0.30±0.14)×10-5, where the first uncertainty is statistical and the second is systematic, is more precise than previous results and constitutes the first observation of the decay with a significance of 6.5 standard deviations.

Observation of the decay B0 →j/psi omega at Belle II

Bettarini, S.;Casarosa, G.;Corona, L.;Forti, F.;Massaccesi, L.;Mondal, S.;Rizzo, G.;Tenchini, F.;Zani, L.;
2025-01-01

Abstract

We measure the branching fraction of the decay B0→J/ψω using data collected with the Belle II detector at the SuperKEKB collider. The data contain (387±6)×106 BB¯ meson pairs produced in energy-asymmetric e+e- collisions at the δ(4S) resonance. The measured branching fraction B(B0→J/ψω)=(2.16±0.30±0.14)×10-5, where the first uncertainty is statistical and the second is systematic, is more precise than previous results and constitutes the first observation of the decay with a significance of 6.5 standard deviations.
2025
Adachi, I.; Aggarwal, L.; Ahmed, H.; Aihara, H.; Akopov, N.; Alhakami, M.; Aloisio, A.; Althubiti, N.; Anh Ky, N.; Asner, D.  m.; Atmacan, H.; Aushev,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1332172
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