Direct determination of neutrino mass parameters at future colliders

Details Direct determination of neutrino mass parameters at future colliders Direct determination of neutrino mass parameters at future colliders

2007-12-26

arxiv.org/abs/0712.3912v2

Phys.Rev.D77:115023,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

A mistake corrected, experimental errors revised, new references added, conclusions unchanged

Scientific paper

10.1103/PhysRevD.77.115023

If the observed light neutrino masses are induced by their Yukawa couplings to singlet right-handed neutrinos, natural smallness of those renders direct collider tests of the electroweak scale neutrino mass mechanisms almost impossible both in the case of Dirac and Majorana (seesaw of type I) neutrinos. However, in the triplet Higgs seesaw scenario the smallness of light neutrino masses may come from the smallness of B-L breaking parameters, allowing sizable Yukawa couplings even for a TeV scale triplet. We show that, in this scenario, measuring the branching fractions of doubly charged Higgs to different same-charged lepton flavours at LHC and/or ILC experiments will allow one to measure the neutrino mass parameters which neutrino oscillation experiments are insensitive to, including the neutrino mass hierarchy, lightest neutrino mass and Majorana phases.

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