Testing the Majorana nature of neutralinos in supersymmetric theories Original Research Article

We discuss selectron pair production in e−e− scattering. These processes can only occur via t-channel neutralino exchange, provided that the neutralinos are Majorana fermions. We concentrate on the processes e−e−→ẽLẽL, ẽRẽR→e−χ̃10e−χ̃20→e−χ̃10e−χ̃10ff̄, in which a complete determination of the final state momenta is possible without using the selectron masses as input. The experimental reconstruction of the selectron masses in this decay channel provides clear evidence of the Majorana character of the neutralinos, which is confirmed by the analysis of the electron energy spectrum.