PoS - Proceedings of Science
Volume 398 - The European Physical Society Conference on High Energy Physics (EPS-HEP2021) - T06: QCD and Hadronic Physics
Studies of charmonium-like states at Belle II (12'+3')
R. Dhamija
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The Belle II experiment has accumulated data corresponding to 213 $\mathrm{fb}^{-1}$ integrated luminosity in the past two years. Belle II plans to accumulate 50 $\mathrm{ab}^{-1}$ of data which is expected to bring a large impact to the field of hadron spectroscopy. We present here the analysis of $B \rightarrow K J/\psi \pi^+\pi^-$ and $B\rightarrow K\psi(2S)$ using 62.8 $\mathrm{fb}^{-1}$ of data at Belle II. We find evidence of $X(3872) \rightarrow J/\psi \pi^+ \pi^-$ with a signal yield of $14.4 \pm 4.6$ and a statistical significance of 4.6 $\sigma$.
We also present the preliminary results of $e^{+}e^{-} \rightarrow \pi^+\pi^-J/\psi$ via ISR using 37.8 $\mathrm{fb}^{-1}$ of data at Belle II.
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