Unified explanation for the new resonance states and theμ−eevents

The existence of a new type of fermion $L$ which can be freely produced in the colliding electron-positron beam is postulated. The narrow-resonance states are interpreted as bound states of $L\overline{L}$ in an unconfined potential and the $\mu -e$ events as due to purely leptonic decays of $L$. Crucial experimental tests of these ideas are suggested.