Study of the decays $\chi_{cJ}\to\Lambda\bar{\Lambda}\omega$

TL;DR

This study reports the first observation of specific chi_cJ decays into Lambda, anti-Lambda, and omega particles, measuring their branching fractions with high statistical significance using a large data sample.

Contribution

First observation and measurement of the branching fractions for chi_cJ to Lambda anti-Lambda omega decays with detailed statistical analysis.

Findings

Branching fractions measured for chi_c0, chi_c1, chi_c2 decays.

Statistical significances exceed 11 sigma for all three decays.

No intermediate structures observed in the decay processes.

Abstract

Using $(27.12\pm 0.14)\times10^{8}$ $\psi(3686)$ events collected with the BESIII detector, we present the first observation of the decays $\chi_{cJ}\to\Lambda\bar{\Lambda}\omega$, where $J=0, 1, 2$, with statistical significances of $11.7 \sigma, 11.2 \sigma$, and $11.8 \sigma$. The branching fractions of these decays are determined to be $\mathcal{B}(\chi_{c0}\to\Lambda\bar{\Lambda}\omega)=({2.37 \pm 0.22 \pm 0.23}) \times 10^{-4}$, $\mathcal{B}(\chi_{c1}\to\Lambda\bar{\Lambda}\omega)=({1.01 \pm 0.10 \pm 0.11}) \times 10^{-4}$, and $\mathcal{B}(\chi_{c2}\to\Lambda\bar{\Lambda}\omega)=({1.40 \pm 0.13 \pm 0.17}) \times 10^{-4}$, where the first uncertainties are statistical and the second are systematic. We observe no clear intermediate structures.