Higgs boson decays and production in the left–right twin Higgs model

Yao-Bei Liu,Xue-Lei Wang

doi:10.1016/j.physletb.2010.10.037

Yao-Bei Liu, Xue-Lei Wang

Open Access

https://doi.org/10.1016/j.physletb.2010.10.037

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Abstract

The left–right twin Higgs model predicts one neutral Higgs boson ϕ0 and it acquires mass mϕ0∼μr with the μ term, which can be lighter than half the SM-like Higgs boson mass in a portion of parameter space. Thus, the SM-like Higgs boson h can dominantly decay into a pair of light neutral Higgs bosons especially when mh is below the WW threshold. First, we examine the branching ratios of the SM-like Higgs boson decays and find that the new decay mode h→ϕ0ϕ0 is dominant for the case of mh>2mϕ0. Then we study the production via gluon fusion followed by the decay into two photons or two weak gauge bosons and found that the production rate can be significantly suppressed for some part of parameter space. Finally, we comparatively study the process γγ→h→bb¯ at ILC in the cases of mh>2mϕ0 and mh<2mϕ0, respectively. We find that these predictions can significantly deviated from the SM predictions, e.g., the gluon–gluon fusion channel, in the cases of mh>2mϕ0 and mh<2mϕ0, can be suppressed by about 80% and 45%, respectively. Therefor, it is possible to probe the left–right twin Higgs model via these Higgs boson production processes at the LHC experiment or in the future ILC experiment.

Highlights

The Higgs boson is the last ingredient of the standard model (SM) to be probed at experiments
The precision electroweak measurement data and direct searches suggest that the Higgs boson must be relatively light and its mass should be roughly in the range of 114.4 GeV∼186 GeV at 95% C.L. [1], but the SM suffers of the so-called hierarchy problem [2], which is due to the presence of quadratic divergences in the loop processes for the scalar Higgs boson self-energy
A wide variety of models have been introduced to address electroweak symmetry breaking (EWSB) and the hierarchy problem: supersymmetry[3], large extra-dimensions[4], topcolor models[5], and little Higgs models[6] et al Recently, the twin Higgs mechanism is proposed as a solution to the little hierarchy problem [7, 8, 9]

Summary

Introduction

The Higgs boson is the last ingredient of the standard model (SM) to be probed at experiments. In this work we first study the decay branching ratios of the Higgs boson in the LRTH model for small value of mφ0.

Results

Conclusion