Study of $\psi(3686)\rightarrow\Lambda\bar{\Lambda}\omega$

TL;DR

This paper reports the first measurement of the branching fraction for the decay of $ ext{psi}(3686)$ into $ ext{Lambda}ar{ ext{Lambda}} ext{omega}$ using BESIII data, and explores possible excited $ ext{Lambda}$ states.

Contribution

It provides the first measurement of the branching fraction for $ ext{psi}(3686) ightarrow ext{Lambda}ar{ ext{Lambda}} ext{omega}$ and investigates excited $ ext{Lambda}$ states in the invariant mass spectra.

Findings

Branching fraction measured as (3.30 ± 0.34 (stat.) ± 0.29 (syst.))×10^{-5}.

Studied $ ext{Lambda} ext{omega}$ invariant mass spectra for excited states.

First measurement of this decay mode.

Abstract

Based on a data sample of $(448.1\pm2.9)\times10^6$ $\psi(3686)$ events collected with the BESIII detector at the BEPCII collider, the branching fraction of $\psi(3686)\rightarrow\Lambda\bar{\Lambda}\omega$ is measured to be $\rm (3.30\pm0.34(stat.)\pm0.29(syst.))\times10^{-5}$ for the first time. In addition, the $\Lambda\omega$ (or $\bar{\Lambda}\omega$) invariant mass spectra is studied and the potential presence of excited $\Lambda$ states has been investigated.