Study of $e^{+}e^{-}\rightarrow h^{+}h^{-}J/\psi$ ($h=\pi,K,p$) via initial-state radiation at Belle II
| Abstract | Using a data sample of $427.9~{\rm fb}^{-1}$ collected by the Belle~II detector at or near the $\Upsilon(4S)$ and $\Upsilon(10753)$ resonances, the cross sections for $e^+e^-\to h^+h^-J/\psi~(h=\pi/K/p)$ at center-of-mass energies ranging from 3.8 GeV or the production threshold to 5.5/6.0/7.0 GeV have been measured via initial-state radiation. The cross sections for the processes $e^+e^-\to\pi^+\pi^-J/\psi$ and $e^+e^-\to K^+ K^-J/\psi$ are consistent with previously published results. The cross sections for these channels obtained by combining with previous Belle results are also given. The process $e^+e^-\to p\bar{p}J/\psi$ is investigated for the first time. The yields are small and no significant structure is observed in the cross section versus energy. Searches for vector charmonium-like states in the $h^+h^-J/\psi$ systems, and for associated intermediate states in the $h^{\pm}J/\psi$ systems, are also presented. |
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| Tags | Run 1 |
| Working group | Quarkonium |
| Principal authors | @ Sen Jia, Yipu Liao, Chengping Shen, Changzheng Yuan |
| Reference | submitted to PRD |
| Links | arXiv:2602.13569, |
The distribution of $M(\pi^+\pi^-)$ in the $Y(4230/4320)$ signal region. The black dots with error bars represent the selected data and the green shaded histograms are the normalized $J/\psi$ sidebands.