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/ψω at Belle II / 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, V., Aversano, M., Ayad, R., Babu, V., Baghel, N. k., Bahinipati, S., Bambade, P., Banerjee, Sw., Barrett, M., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 111:3(2025), pp. 032012.1-032012.8. [10.1103/physrevd.111.032012]

Observation of the decay B0 →j/ψω at Belle II

Dorigo, M.;Gabrielli, A.;Ganiev, E.;Ghosh, D.;Lanceri, L.;Manfredi, R.;Mantovano, M.;Raiz, S.;Vitale, 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
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3121649
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