Two-Higgs-doublet type-II seesaw model

Chuan Hung Chen, Takaaki Nomura

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Motivated by the new observed scalar boson of 126 GeV at ATLAS and CMS, various phenomena in the two-Higgs-doublet model 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 a triplet and doublets. As a result, we have a completely different decay pattern for doubly charged Higgs (δ±±); even the vacuum expectation value of a Higgs triplet is at GeV level, which is limited by the precision measurement for the ρ parameter. For illustrating the new characters of the model, we study the influence of new interactions on the new open channels δ++→(H1+W+(∗),H1+H1+) with H1+ 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 δ++ via δ++→tbW+→bb¯W+W+ by mediated H1+ becomes significant.

Original languageEnglish
Article number075008
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number7
Publication statusPublished - 2014 Oct 10

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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