Observation of the decay $B^0\to J/\psi \omega$ at Belle II

Abstract

We measure the branching fraction of the decay $B^0\to J/\psi \omega$ using data collected with the Belle II detector at the SuperKEKB collider. The data contain $(387\pm 6)\times 10^6$ $B\overline{B}$ meson pairs produced in energy-asymmetric $e^{+}{e}^{-}$ collisions at the ${\rm Y}(4S)$ resonance. The measured branching fraction $\mathcal{B}(B^0\to J/\psi \omega )=\left(2.16\pm 0.30\pm 0.14\right)\times 10^{-5}$, 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.

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Cited by in corpus (2)

• Search for a Dark Higgs Boson Produced in Association with Inelastic Dark Matter at the Belle II Experiment
• How to tame penguins: Advancing to high-precision measurements of ${\varphi }_d$ and ${\varphi }_s$