Observation of chi_{cJ} Decays to \Lambda \Lambda bar\pi^{+}\pi^{-}

TL;DR

This paper reports the first observation of chi_{cJ} decays to  final states, measuring branching ratios and confirming theoretical predictions related to the color-octet effect.

Contribution

It provides the first experimental evidence of chi_{cJ} decays to  final states and measures the branching ratios involving intermediate (1385) states, validating theoretical models.

Findings

First observation of chi_{cJ} decays to  final states

Measured branching ratios for intermediate (1385) processes

Results agree with color-octet effect predictions

Abstract

Decays of the chi_{cJ} states (J=0,\ 1,\ 2) to \Lambda \Lambda bar\ pi^{+} \pi^{-}, including processes with intermediate \Sigma(1385), are studied through the E1 transition psi'-->\gamma chi_{cJ} using 106 million psi' events collected with the BESIII detector at BEPCII. This is the first observation of chi_{cJ} decays to the final state \Lambda\Lambda bar \pi^{+}\pi^{-}. The branching ratio of the intermediate process chi_{cJ}-->\Sigma(1385)^{+/-} \bar{\Sigma}(1385)^{-/+} is also measured for the first time, and the results agree with the theoretical predictions based on the color-octet effect.