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 $p p \to H^\pm W^\mp b \bar{b}$. In the decay part, only the $\tau\nu$ mode is mainly concerned because of the experimental difficulty in the $t b$ 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 $g g \to H/A \to H^\pm W^\mp$, 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.
Highlights
The repeated phrase “no excess above the estimated standard model (SM) background” in every new physics study at the LHC is disappointing to many particle physicists
We question whether the branching ratios can be meaningfully enhanced if we extend the 2HDM by introducing vectorlike fermions (VLFs) [24]
Targeting the intermediated-mass charged Higgs boson HÆ, we have explored the theoretical possibility that the branching ratios of its radiative decays into WÆγ and WÆZ are large enough for the LHC discovery
Summary
The repeated phrase “no excess above the estimated standard model (SM) background” in every new physics study at the LHC is disappointing to many particle physicists. The total production cross section of the full process pp → HÆW∓bbincluding resonant and nonresonant top quark diagrams was computed at next-to-leading order (NLO) accuracy [11] This NLO computation stimulates the charged Higgs search for the intermediate mass region. In a large portion of the parameter space, BrðHÆ → WÆγÞ for the intermediate-mass charged Higgs boson is greatly enhanced by a few orders of magnitude.
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