Signatures for Majorana neutrinos in e-gamma colliders

J. PERESSUTTI AND O. A. SAMPAYO, J. I. ARANDA

PHYSICAL REVIEW D - PARTICLE AND FILDS

APS

Año: 2001 vol. 64 p. 1 - 5

0556-2821

We study the possibilities to detect Majorana neutrinos in e-gamma colliders for different center of mass energies. We study the W-W-lj+ (lj+ = e+,m+,t+) final states which are, due to leptonic number violation, a clear signature for an intermediate Majorana neutrino contribution. Such a signal ~final leptons have the opposite charge of initial leptons! is not possible if the heavy neutrinos are Dirac particles. In our calculation we use the helicity formalism to obtain analytic expressions for the amplitude and we have considered that the intermediate neutrinos can be either on shell or off shell. Finally we present our results for the total cross section and for the angular distribution of the final lepton. We also include a discussion on the expected events number as a function of the input parameters