Observation of the decays $\chi_{cJ}\to\Sigma^{0}\bar{p}K^{+}+{\rm c.c.}~(J=0, 1, 2)$

TL;DR

This study measures the branching fractions of specific $ ext{chi}_{cJ}$ decays into $ ext{Sigma}^0$, anti-proton, and $K^+$, using a large data sample from BESIII, and finds no significant excited baryon resonance structures.

Contribution

First precise measurements of $ ext{chi}_{cJ}$ decay branching fractions into $ ext{Sigma}^0 ar{p} K^+$ channels with a large data sample from BESIII.

Findings

Branching fractions measured with statistical and systematic uncertainties.

No evident excited baryon resonance structures observed.

Results improve understanding of charmonium decay processes.

Abstract

The decays $\chi_{cJ}\to\Sigma^{0}\bar{p}K^{+}+{\rm c.c.}~(J = 0, 1, 2)$ are studied via the radiative transition $\psi(3686)\to\gamma\chi_{cJ}$ based on a data sample of $(448.1 \pm 2.9)\times10^{6}$ $\psi(3686)$ events collected with the BESIII detector. The branching fractions of $\chi_{cJ}\to\Sigma^{0}\bar{p}K^{+}+{\rm c.c.}~(J = 0, 1, 2)$ are measured to be $(3.03 \pm 0.12\pm 0.15)\times10^{-4}$, $(1.46 \pm 0.07\pm 0.07)\times10^{-4}$, and $(0.91 \pm 0.06\pm 0.05)\times10^{-4}$, respectively, where the first uncertainties are statistical and the second are systematic. In addition, no evident structure is found for excited baryon resonances on the two-body subsystems with the limited statistics.