Signatures for Majorana neutrinos in $e^- γ$ collider

Details Signatures for Majorana neutrinos in $e^- γ$ collider Signatures for Majorana neutrinos in $e^- γ$ collider

2001-05-16

arxiv.org/abs/hep-ph/0105162v1

Phys.Rev. D64 (2001) 073007

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex file with 12 pages and 6 figures. Submited to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.64.073007

We study the possibilities to detect Majorana neutrinos in $e^- \gamma$ colliders for different center of mass energies. We study the $W^- W^- l_j^{+}(l_j^+\equiv e^+ ,\mu^+ ,\tau^+)$ final state which are, due to leptonic number violation, a clear signature for intermediate Majorana neutrino contribution. Such a signal (final lepton have the opposite charge of the initial lepton) 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.

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