Observation of $\chi_{cJ}\to 3K_S^0K^\pm\pi^\mp$

TL;DR

This study reports the first observation of the decay modes of $oldsymbol{ ext{chi}_cJ}$ particles into specific multi-kaon and pion final states, measuring their branching fractions with high statistical significance.

Contribution

First observation of $ ext{chi}_cJ$ decays into $3K_S^0K^\pm\pi^\mp$ with precise branching fraction measurements.

Findings

Decays observed with >10σ significance.

Branching fractions measured with statistical and systematic uncertainties.

Provides new data on $ ext{chi}_cJ$ decay channels.

Abstract

By analyzing $(2712.4\pm14.3)\times10^6$ $\psi(3686)$ events collected with the BESIII detector operating at the BEPCII collider, the decays $\chi_{c0,1,2} \to 3K_S^0K^\pm\pi^\mp$ are observed for the first time with statistical significances greater than $10\sigma$. The branching fractions of these decays are determined to be $\mathcal{B}(\chi_{c0}\to 3K_S^0K^\pm\pi^\mp )=(7.95\pm0.50\pm0.65)\times10^{-5},$ $\mathcal{B}(\chi_{c1}\to 3K_S^0K^\pm\pi^\mp)=(2.62\pm0.08\pm0.19)\times10^{-4},$ and $\mathcal{B}(\chi_{c2}\to 3K_S^0K^\pm\pi^\mp)=(1.72\pm0.07\pm0.15)\times10^{-4},$ where the first uncertainties are statistical and the second systematic.