Radiative neutrino decay and CP-violation in R-parity violating   supersymmetry
  We calculate the radiative decay amplitude for Majorana neutrinos in trilinear R-parity violating supersymmetric framework. Our results make no assumption regarding the masses and mixings of fermions and sfermions. The results obtained are exemplary for generic models with loop-generated neutrino masses. Comparison of this amplitude with the neutrino mass matrix shows that the two provide independent probes of CP-violating phases. 
Gautam Bhattacharyya, Palash B. Pal, Heinrich P\"as, Thomas J. Weiler