Using an electron-positron collision data sample corresponding to (1.0087\pm0.0044)\times10^{10} J/\psi events collected using the BESIII detector at the BEPCII collider, we firstly search for the lepton number violation decay phi \to \pi^+ \pi^+ e^- e^-J/\psi\to \phi\eta No obviously signals are found. The upper limit on the branching fraction of phi \to \pi^+ \pi^+ e^- e^- 1.3\times10^{-5} at the 90% confidence level.
Search for the lepton number violation decay ϕ → π+π+e−e− via J/ψ → ϕη*
Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Sosio, S.;Spataro, S.;
2025-01-01
Abstract
Using an electron-positron collision data sample corresponding to (1.0087\pm0.0044)\times10^{10} J/\psi events collected using the BESIII detector at the BEPCII collider, we firstly search for the lepton number violation decay phi \to \pi^+ \pi^+ e^- e^-J/\psi\to \phi\eta No obviously signals are found. The upper limit on the branching fraction of phi \to \pi^+ \pi^+ e^- e^- 1.3\times10^{-5} at the 90% confidence level.
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