Two-Higgs-Doublet Type-II Seesaw Model

Abstract

Motivated by the new observed scalar boson of 126 GeV at ATLAS and CMS, various phenomena in two-Higgs-doublet model (THDM) are investigated broadly in the literature. For considering the model that possesses a solution to the massive neutrinos, we study the simplest extension of conventional type-II seesaw model to two Higgs doublets. We find that the new interactions in the scalar potential cause the sizable mixture of charged Higgses in triplet and doublet. As a result, we have a completely different decay pattern for doubly charged Higgs (${\delta }^{\pm \pm }$), even the vacuum expectation value (VEV) of Higgs triplet is at GeV level, which is limited by the precision measurement for $\rho$-parameter. For illustrating the new characters of the model, we study the influence of new interactions on the new open channels ${\delta }^{++}\to (H_1^{+}{W}^{{+}^{(\ast )}},H_1^{+}{H}_1^{+})$ with $H_1^{+}$ being the lightest charged Higgs. Additionally, due to the new mixing effect, the triplet charged Higgs could couple to quarks in the model; therefore, the search for ${\delta }^{++}$ via ${\delta }^{++}\to tb{W}^{+}\to b\bar{b}{W}^{+}{W}^{+}$ by mediated $H_1^{+}$ becomes significant.

18 pages, 8 figures, Version to appear in PRD

References in corpus (11)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
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Cited by in corpus (2)

• Search for ${\delta }^{\pm \pm }$ with new decay patterns at the LHC
• Search for a light-charged Higgs in a two-Higgs-doublet type II seesaw model at the LHC