Update on $e^+e^-\to\pi^+\pi^-\psi(2S)$ via Initial State Radiation at Belle

ORAL

Abstract

Using the $980~\rm fb^{-1}$ full data sample taken with the Belle detector, the cross section of $e^+e^-\to \pi^+\pi^-\psi(2S)$ between 4.0 and 5.5~$\rm GeV$ is measured via initial state radiation. The properties of the $Y(4360)$ and $Y(4660)$ are updated. Fitting the mass spectrum of $e^+e^- \to \pi^+\pi^-\psi(2S)$ with two coherent Breit-Wigner functions yields two equivalent solutions with either constructive or destructive interference. We also search for a possible charged charmoniumlike structure in the $\pi^{\pm} \psi(2S)$ intermediate state.

Authors

  • XiaoLong Wang

    Virginia Tech