Bounds on effective Majorana neutrino masses at HERA

Details Bounds on effective Majorana neutrino masses at HERA Bounds on effective Majorana neutrino masses at HERA

1999-11-10

arxiv.org/abs/hep-ph/9911298v2

Phys.Lett.B473:324-329,2000; Erratum-ibid.B480:418,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 4 figures, revised version

Scientific paper

10.1016/S0370-2693(99)01483-5

The lepton-number violating process e p \to nu_e l l' X mediated by Majorana neutrinos is studied for the HERA collider for (l l') = (e tau), (mu tau), (mu mu) and (tau tau). Only the muonic decay of the tau is considered. The direct limit on the effective muon Majorana mass, is improved significantly to 4.0 times 10^3 GeV and for the first time direct limits on the analogous effective masses connected with the tau sector are given, namely 4.2 times 10^3 GeV for , 4.4 times 10^3 GeV for and 2.0 times 10^4 GeV for . We find that a more general analysis for an upgraded HERA could improve this values by a factor of up to 40, yet still being orders of magnitude worse than indirect limits.

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