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 ð387 6Þ × 10 6 B ¯B meson pairs produced in energy-asymmetric eþe− collisions at the ϒð4SÞ resonance. The measured branching fraction BðB0 → J=ψωÞ ¼ ð2.16 0.30 0.14Þ × 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

F. Bianchi;A. Boschetti;M. Destefanis;M. Maggiora;S. Marcello;S. Spataro;
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 ð387 6Þ × 10 6 B ¯B meson pairs produced in energy-asymmetric eþe− collisions at the ϒð4SÞ resonance. The measured branching fraction BðB0 → J=ψωÞ ¼ ð2.16 0.30 0.14Þ × 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
111
3
032012-1
032012-8
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.111.032012
Decays, branching fractions, e+e− collisions
I. Adachi , L. Aggarwal , H. Ahmed , H. Aihara , N. Akopov , M. Alhakami , A. Aloisio , N. Althubiti , N. Anh Ky , D. M. Asner , H. Atmacan , V. Aush...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2070715
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