The $W\gamma$ decay of the elusive charged Higgs boson in the two-Higgs-doublet model with vectorlike fermions

Abstract

The LHC search for the charged Higgs boson in the intermediate-mass range ($M_{H^{\pm }}\sim m_t$) is actively being performed after the next-to-leading order calculation of the total production cross section of $pp\to H^{\pm }{W}^{\mp }b\bar{b}$. In the decay part, only the $\tau \nu$ mode is mainly concerned because of the experimental difficulty in the $tb$ mode. In the framework of a two-Higgs-doublet model, we suggest that the $W\gamma$ channel can be helpful in probing this charged Higgs boson, if introducing vectorlike fermions. In type-I-II model where the SM fermions are assigned in type-I while the vectorlike fermions are in type-II, the branching ratio is greatly enhanced up to $\sim \mathcal{O}(0.01)$ in a large portion of the parameter space allowed by the Higgs precision data, the electroweak oblique parameters, and the direct search bounds at the LHC. Two kinds of production channels, $gg\to H^{\pm }{W}^{\mp }b\bar{b}$ and $gg\to H/A\to H^{\pm }{W}^{\mp }$, are also studied. We find that the signal rate $\sigma \times \mathcal{B}(W\gamma )$ is quite sizable, more than 10 fb in some parameter space.

The study is extended in the whole intermediate mass range of the charged Higgs boson. 35 pages, 14 figures, To appear in PRD

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• Comprehensive study of the light charged Higgs boson in the type-I two-Higgs-doublet model
• Disentangling new physics effects on non-resonant Higgs boson pair production from gluon fusion
• The Radiation Valley and Exotic Resonances in $W\gamma$ Production at the LHC
• Fermiophobic light Higgs boson in the type-I two-Higgs-doublet model
• Low energy phenomena of the lepton sector in an $A_4$ symmetry model with heavy inverse seesaw neutrinos
• $WW\gamma$ production at hadron colliders with NLO QCD+EW corrections and parton shower effects
• Disentangling the high and low cutoff scales via the trilinear Higgs couplings in the type-I two-Higgs-doublet model