Testing the Higgs triplet model with the mass difference at the LHC

Mayumi Aoki; Shinya Kanemura; Kei Yagyu

doi:10.1103/PhysRevD.85.055007

paper

Testing the Higgs triplet model with the mass difference at the LHC

arXiv:1110.4625 · doi:10.1103/PhysRevD.85.055007

Abstract

In general, there can be mass differences among scalar bosons of the Higgs triplet field with the hypercharge of Y=1. In the Higgs triplet model, when the vacuum expectation value $v_{Δ}$ of the triplet field is much smaller than that $v$ ( $≃ 246$ GeV) of the Higgs doublet field as required by the electroweak precision data, a characteristic mass spectrum $m_{H^{++}}^{2} - m_{H^{+}}^{2} ≃ m_{H^{+}}^{2} - m_{ϕ^{0}}^{2} (\equiv ξ)$ appears, where $m_{H^{++}}$ , $m_{H^{+}}$ , $m_{ϕ^{0}}$ are the masses of the doubly-charged ( $H^{++}$ ), the singly-charged ( $H^{+}$ ) and the neutral ( $ϕ^{0} = H^{0}$ or $A^{0}$ ) scalar bosons, respectively. It should be emphasized that phenomenology with $ξ \neq = 0$ is drastically different from that in the case with $ξ = 0$ where the doubly-charged scalar boson decays into the same sign dilepton $ℓ^{+} ℓ^{+}$ or the diboson $W^{+} W^{+}$ depending on the size of $v_{Δ}$ . We find that, in the case of $ξ > 0$ , where $H^{++}$ is the heaviest, $H^{++}$ can be identified via the cascade decays such as $H^{++} \to H^{+} W^{+ (*)} \to ϕ^{0} W^{+ (*)} W^{+ (*)} \to b b ˉ ℓ^{+} ν ℓ^{+} ν$ . We outline how the Higgs triplet model can be explored in such a case at the LHC. By the determination of the mass spectrum, the model can be tested and further can be distinguished from the other models with doubly-charged scalar bosons.

15 pages, 28 figures, text slightly modified, version to appear in Physical Review D

Testing the Higgs triplet model with the mass difference at the LHC

Abstract

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