Published December 19, 2025 | Version v1
Journal article Open

Measurement of the branching fraction of $ \psi (3686)$ $ \to \omega \eta \eta $

  • 1. CERN

Description

Using a sample of ($ 2.712\pm 0.014$)$ \times {10}^{9}\text{}\text{}\psi (3686)$ events collected with the BESIII detector at the BEPCII collider in 2009, 2012, and 2021, the decay $ \psi (3686)\to \omega \eta \eta $ is observed for the first time. The branching fraction of the $ \psi (3686)\to \omega \eta \eta $ decay is measured to be ($ 1.65\pm 0.02\pm 0.21$)$ \times {10}^{-5}$, where the first uncertainty is statistical and the second systematic.

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