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We discuss muon and electron lepton-number nonconservation due to renormalization effects of the scalar-lepton mass matrix in spontaneously broken $N=1$ supergravity theories. Differently from the case of massless or Dirac neutrinos, we find that if neutrinos are Majorana particles in a "seesaw" scheme the couplings photino-lepton-scalar-lepton lead to sizable rates for the processes μ→eγ and μ+nucleus→e+nucleus. We discuss the constraints derived from the present experimental bounds.
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Borzumati et al. (1986) studied this question.
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