Neutrino mass hierarchy and Majorana CP phases within the Higgs triplet model at the LHC

Abstract

Neutrino masses may be generated by the VEV of an $SU(2{)}_L$ Higgs triplet. We assume that the doubly charged component of such a triplet has a mass in the range of several 100 GeV, such that it is accessible at LHC. Its decay into like-sign leptons provides a clean experimental signature, which allows for a direct test of the neutrino mass matrix. By exploring the branching ratios of this decay into leptons of various flavours, we show that within this model the type of the neutrino mass spectrum (normal, inverted or quasi-degenerate) might actually be resolved at the LHC. Furthermore, we show that within the Higgs triplet model for neutrino mass the decays of the doubly charged scalar into like-sign lepton pairs at the LHC provide a possibility to determine the Majorana CP phases of the lepton mixing matrix.

22 pages, 6 figures. Version to be published at JHEP

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• Pair Production of Doubly-Charged Scalars: Neutrino Mass Constraints and Signals at the LHC
• Probing seesaw at LHC
• Testing neutrino masses in little Higgs models via discovery of doubly charged Higgs at LHC
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• Direct determination of neutrino mass parameters at future colliders
• Testing a Neutrino Mass Generation Mechanism at the Large Hadron Collider
• Higgs Mass Bounds, Type II SeeSaw and LHC
• Tetra-maximal Neutrino Mixing and Its Implications on Neutrino Oscillations and Collider Signatures
• Lepton Masses in a Minimal Model with Triplet Higgs Bosons and $S_3$ Flavor Symmetry
• Neutrinoless Double Beta Decay and H^{\pm\pm}\to {l'}^\pm l^\pm Decays in the Higgs Triplet Model
• Unitarity violation in sequential neutrino mixing in a model of extra dimensions