A CP-violating phase in a two Higgs triplet scenario : some phenomenological implications

Abstract

We consider a scenario where, along with the usual Higgs doublet, two scalar triplets are present. The extension of the triplet sector is required for the Type~II mechanism for the generation of neutrino masses, if this mechanism has to generate a neutrino mass matrix with two-zero texture. One CP-violating phase has been retained in the scalar potential of the model, and all parameters have been chosen consistently with the observed neutrino mass and mixing patterns. We find that a large phase ($\gtrsim 60^{\circ }$) splits the two doubly-charged scalar mass eigenstates wider apart, so that the decay $H_1^{++}\to H_2^{++}h$ is dominant (with h being the $125$ GeV scalar). We identify a set of benchmark points where this decay dominates. This is complementary to the situation, reported in our earlier work, where the heavier doubly-charged scalar decays as $H_1^{++}\to H_2^{+}{W}^{+}$. We point out the rather spectacular signal, ensuing from $H_1^{++}\to H_2^{++}h$, in the form of Higgs plus same-sign dilepton peak, which can be observed at the Large Hadron Collider.

arXiv comment26 pages, 9 tables, 3 figures

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