SUPERSYMMETRY AND LARGE TRANSITION MAGNETIC-MOMENT OF THE NEUTRINO

We show that the most general minimal supersymmetric standard model with le-l symmetry (li=ith lepton number) and a discrete horizontal symmetry between e and families can generate a large transition magnetic moment for the neutrino while leading to a naturally small mass. A magnetic moment of order 0.3×10-10B implies me=m1 eV. The photino, which is expected to be the lightest supersymmetric particle, is unstable in this scheme, decaying dominantly into three-lepton final states (+»e-, e+»-+charge conjugate). © 1990 The American Physical Society.