Invisibly decaying Higgs boson in the Littlest Higgs model with T-parity
Raghavendra Srikanth Hundi, Biswarup Mukhopadhyaya, Andreas, Nyffeler (Harish-Chandra Research Institute)
TL;DR
This paper explores how, within the Littlest Higgs model with T-parity, the Higgs boson can decay invisibly into heavy photons, significantly affecting its decay width and branching ratios for certain parameter ranges.
Contribution
It identifies parameter space regions where the Higgs decays invisibly into heavy photons with high branching ratios, a novel feature in this model.
Findings
Higgs can decay invisibly with up to 95% branching ratio.
Total Higgs decay width can be increased by an order of magnitude.
Invisibly decaying Higgs is possible for symmetry breaking scale 450-600 GeV.
Abstract
We show that there are regions in the parameter space of the Littlest Higgs model with T-parity, allowed by electroweak precision data, where the Higgs boson can decay invisibly into a pair of heavy photons A_H with a substantial branching ratio. For a symmetry breaking scale f in the range 450-600 GeV, the BR(H -> A_H A_H) can be up to 95% for an intermediate mass Higgs, and from 20% down to a few percents for a Higgs boson of mass 200 GeV or above. The total decay width of the Higgs boson can thereby be enhanced by an order of magnitude compared to the Standard Model for Higgs masses around 130 GeV.
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