First observations of $\psi(2S)$ and $\chi_{cJ}(1P)$ decays to four-body final states $h^+h^- K^0_S K^0_S$

TL;DR

This paper reports the first measurements of decay modes of $\\psi(2S)$ and $\\chi_{cJ}(1P)$ particles into specific four-body final states, providing new data on their branching fractions with improved precision.

Contribution

It presents the first observations and measurements of these decay channels, improving the statistical accuracy of certain branching fractions.

Findings

Branching fractions of $\\chi_{c0}$ and $\\chi_{c2}$ to $K^0_S K^0_S$ are measured with better precision.

First observations of $\\psi(2S)$ and $\\chi_{cJ}$ decays to these four-body states.

Data collected from 14 million $\\psi(2S)$ events at BESII/BEPC.

Abstract

$\chi_{c0}$, $\chi_{c1}$, and $\chi_{c2}$ decays to $\pi^+\pi^-K^0_SK^0_S$ and $K^+K^-K^0_SK^0_S$, as well as $\psi(2S)$ decay to $\pi^+\pi^-K^0_SK^0_S$ are presented. The branching fractions of these decay channels are determined using $14\times 10^6$ $\psi(2S)$ events collected at BESII/BEPC. The branching fractions of $\chi_{c0},\chi_{c2}\to K^0_SK^0_S$ are measured with improved statistical precision.