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.

References in corpus (5)

• An Introduction to PYTHIA 8.2
• Measurement of the resonant and CP components in ${\overline{B}}^0\to J/\psi {\pi }^{+}{\pi }^{-}$ decays
• The Design, Construction, Operation and Performance of the Belle II Silicon Vertex Detector
• In Pursuit of New Physics with $B_d^0\to J/\psi K^0$ and $B_s^0\to J/\psi \varphi$ Decays at the High-Precision Frontier
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