Search for the charged lepton flavour violating decay $η'\to eμ$
BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson et autres
Based on $(8998\pm40)\times10^6$ $J/ψ$ events collected in $e^+e^-$ collisions at $\sqrt{s} = 3.097$ GeV with the BESIII detector, we present a search for the charged lepton flavour violating decay $η'\to eμ$ with $J/ψ\toγη'$. No significant signal is observed, and an upper limit …
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