Search for the lepton number violating decay $\eta \to {\pi }^{+}{\pi }^{+}{e}^{-}{e}^{-}+c.c.$ via $J/\psi \to \varphi \eta$

Abstract

Based on a sample of $(10.087\pm 0.044)\times 10^{9}J/\psi$ events collected by the BESIII detector at the BEPCII collider, we perform the first search for the lepton number violating decay $\eta \to {\pi }^{+}{\pi }^{+}{e}^{-}{e}^{-}+\text{c.c.}$ No signal is found, and an upper limit on the branching fraction of $\eta \to {\pi }^{+}{\pi }^{+}{e}^{-}{e}^{-}+c.c.$ is set to be $4.6\times 10^{-6}$ at the 90\% confidence level.

9 pages, 2 figures

References in corpus (5)

• Search for Majorana neutrinos in $B^{-}\to {\pi }^{+}{\mu }^{-}{\mu }^{-}$ decays
• Searches for Lepton Number Violation and Resonances in $K^{\pm }\to \pi \mu \mu$ Decays
• Searches for lepton number violating $K^{+}\to {\pi }^{-}({\pi }^0)e^{+}{e}^{+}$ decays
• Search for heavy Majorana neutrino in lepton number violating decays of D-> K pi e+ e+
• Searching for ${}^{76}$Ge neutrinoless double beta decay with the CDEX-1B experiment