LEP $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}\gamma \gamma$ events and their consequences at future $e^{+}{e}^{-}$ colliders

The $e^{+}{e}^{-}\to l^{+}{\text{l}}^{-}\gamma \gamma$ anomalous events, detected by $L3$ de-tec-tor at $e^{+}{e}^{-}$ $CERN-LEP$ collider have been analysed. It has been shown that the interpretation of such events as a manifestation of scalar (pseudoscalar) resonance with the mass of 60 GeV contradicts other experimental data. In case of a possible existence that kind of resonance, the perspectives to discover one in some processes at future $e^{+}{e}^{-}$ colliders have been discussed.