Heavy Majorana neutrinos in e+e- colliders

Details Heavy Majorana neutrinos in e+e- colliders Heavy Majorana neutrinos in e+e- colliders

1998-12-30

arxiv.org/abs/hep-ph/9812525v3

Phys.Rev.Lett. 82 (1999) 4761-4764

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, latex (revtex), 4 eps-figures, text slightly modified, appears in Physical Review Letters (June 7, 1999, issue)

Scientific paper

10.1103/PhysRevLett.82.4761

We investigate possibilities for detecting heavy Majorana neutrinos ($N$'s) in $e^+e^-$ at LEP200 and future Linear Colliders. We concentrate on the processes where the pairs of intermediate heavy $N$'s produce a clear signal of total lepton number violation ($e^+e^- \to NN \to W^+l^-W^+l^{\prime -}$). Such a signal is not possible if the heavy neutrinos are of Dirac nature. Our approach is general in the sense that the intermediate $N$'s can be either on shell or off shell. Discussion of the relative numerical importance of the $s$ and the $t+u$ channels of the $NN$ production is also included.

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