Search for the lepton number violation decay ω→ π⁺ π⁺ e^-e^- +c.c.

2025/04/30 by BESIII Collaboration, Ablikim, M., Achasov, M. N. +689 · 1 citation
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2504.21539

Abstract

The lepton number violation decay ω→ π⁺ π⁺ e^-e^- +c.c. is searched for via J/ψ→ ωη using a data sample of (1.0087 ± 0.0044) × 10¹⁰ J/ψ events collected by the BESIII detector at the BEPCII collider. No significant signal is observed, and the upper limit on the branching fraction of ω→ π⁺ π⁺ e^-e^- +c.c. at the 90% confidence level is determined for the first time to be 2.8 × 10^-6.

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