Electron to Muon Conversion in Electron-Nucleus Scattering as a Probe of   Supersymmetry
  We suggest that $e\to \mu$ conversion in low-energy electron-nucleus scattering is a new and potentially observable indirect signal of supersymmetry and should be searched for in experiment.   We estimate the rate for this process in a straightforward calculation taking into account the existing constraint from non-observation of the $\mu\to e\gamma$ decay and find the cross-section to be $\sigma < 10^{-8} $fb. 
T.Blazek and S.F.King