Search for a light-charged Higgs in a two-Higgs-doublet type II seesaw model at the LHC

Chuan Hung Chen, Takaaki Nomura

Research output: Contribution to journalArticle

2 Citations (Scopus)


A charged Higgs in the type II two-Higgs-doublet model (THDM) has been bounded to be above a few hundred GeV by the radiative B decays. A Higgs triplet extension of the THDM not only provides an origin of neutrino masses and a completely new doubly-charged Higgs decay pattern, but it also achieves a light-charged Higgs with a mass of O(100) GeV through the new scalar couplings in the scalar potential. It was found that these light-charged Higgs decays depend on its mass mH± , tan⁡β, and mixing effect sin⁡θ±: at tan⁡β=1, if mH± >mW+mZ, b¯bW±, W±Z, and τν are the main decay modes; however, if mH± <mW+mZ, the main decay modes are then b¯bW and τν, and at tan⁡β=30, the τν mode dominates the other decays. When mt>mH± +mb, we found that the ATLAS and CMS recent upper bounds on the product of BR(t→H+b)BR(H+→τ+ν) can be directly applied and will give a strict constraint on the correlation of mH± and sin⁡θ±. If the upper bound of BR(t→H+b)BR(H+→τ+ν) is satisfied (escaped) for mt>(<)mH± +mb, it was found that the significance of discovering the charged Higgs through H±→W±Z is much lower than that through H±→b¯bW±. With a luminosity of 100 fb−1 at s=13 TeV and including the experimental bounds, the significance of the H±→b¯bW± signal can reach around 6.2(2.4)σ for mH± <(>)mW+mZ.

Original languageEnglish
Pages (from-to)443-449
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 2017 Apr 10


All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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