A variety of lepton number violating processes related to Majorana   neutrino masses
  A Majorana type of the neutrino mass matrix induces a class of lepton number violating processes. Cross sections of these reactions are given in terms of the neutrino mass matrix element, and a semi-realistic event rate is estimated. These processes provide mass and mixing parameters not directly accessible by the neutrino oscillation experiments. If these processes are discovered with a larger rate than given here, it would imply a new physics of the lepton number violation not directly related to the Majorana neutrino mass, such as R-parity violating operators in SUSY models. 
C.S. Lim (Kobe U.), E. Takasugi (Osaka U.), M. Yoshimura (Okayama U.)