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Enhancement of the H±W∓Z vertex in the three scalar doublet model

Enhancement of the H±W∓Z vertex in the three scalar doublet model
Enhancement of the H±W∓Z vertex in the three scalar doublet model
We compute one-loop induced trilinear vertices with physical charged Higgs bosons $H^\pm$ and ordinary gauge bosons, i.e., $H^\pm W^\mp Z$ and $H^\pm W^\mp \gamma$, in the model with two active plus one inert scalar doublet fields under a $Z_2(\text{unbroken})\times \tilde{Z}_2(\text{softly-broken})$ symmetry. The $Z_2$ and $\tilde{Z}_2$ symmetries are introduced to guarantee the stability of a dark matter candidate and to forbid the flavour changing neutral current at the tree level, respectively. The dominant form factor $F_Z$ of the $H^\pm W^\mp Z$ vertex can be enhanced by non-decoupling effects of extra scalar boson loop contributions. We find that, in such a model, $|F_Z|^2$ can be one order of magnitude larger than that predicted in two Higgs doublet models under the constraints from vacuum stability, perturbative unitarity and the electroweak precision observables. In addition, the branching fraction of the $H^\pm \to W^\pm Z$ $(H^\pm \to W^\pm \gamma)$ mode can be of order 10~(1)\% level when the mass of $H^\pm$ is below the top quark mass. Such a light $H^\pm$ is allowed by the so-called Type-I and Type-X Yukawa interactions which appear under the classification of the $\tilde{Z}$ charge assignment of the quarks and leptons. We also calculate the cross sections for the processes $H^\pm \to W^\pm Z$ and $H^\pm \to W^\pm \gamma$ onset by the top quark decay $t\to H^\pm b$ and electroweak $H^\pm$ production at the LHC.
hep-ph
1029-8479
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
Rojas, Diana
55118d87-8b05-48de-bcfc-a3d7bb7c13b4
Yagyu, Kei
ecd84785-710b-4526-8b41-55ae605e633c
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
Rojas, Diana
55118d87-8b05-48de-bcfc-a3d7bb7c13b4
Yagyu, Kei
ecd84785-710b-4526-8b41-55ae605e633c

Moretti, Stefano, Rojas, Diana and Yagyu, Kei (2015) Enhancement of the H±W∓Z vertex in the three scalar doublet model. Journal of High Energy Physics, 2015 (08), [116]. (doi:10.1007/JHEP08(2015)116).

Record type: Article

Abstract

We compute one-loop induced trilinear vertices with physical charged Higgs bosons $H^\pm$ and ordinary gauge bosons, i.e., $H^\pm W^\mp Z$ and $H^\pm W^\mp \gamma$, in the model with two active plus one inert scalar doublet fields under a $Z_2(\text{unbroken})\times \tilde{Z}_2(\text{softly-broken})$ symmetry. The $Z_2$ and $\tilde{Z}_2$ symmetries are introduced to guarantee the stability of a dark matter candidate and to forbid the flavour changing neutral current at the tree level, respectively. The dominant form factor $F_Z$ of the $H^\pm W^\mp Z$ vertex can be enhanced by non-decoupling effects of extra scalar boson loop contributions. We find that, in such a model, $|F_Z|^2$ can be one order of magnitude larger than that predicted in two Higgs doublet models under the constraints from vacuum stability, perturbative unitarity and the electroweak precision observables. In addition, the branching fraction of the $H^\pm \to W^\pm Z$ $(H^\pm \to W^\pm \gamma)$ mode can be of order 10~(1)\% level when the mass of $H^\pm$ is below the top quark mass. Such a light $H^\pm$ is allowed by the so-called Type-I and Type-X Yukawa interactions which appear under the classification of the $\tilde{Z}$ charge assignment of the quarks and leptons. We also calculate the cross sections for the processes $H^\pm \to W^\pm Z$ and $H^\pm \to W^\pm \gamma$ onset by the top quark decay $t\to H^\pm b$ and electroweak $H^\pm$ production at the LHC.

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More information

Accepted/In Press date: 5 August 2015
Published date: 24 August 2015
Additional Information: 33 pages, 24 figures, References added
Keywords: hep-ph
Organisations: Theory Group

Identifiers

Local EPrints ID: 411847
URI: http://eprints.soton.ac.uk/id/eprint/411847
ISSN: 1029-8479
PURE UUID: 0b9216cf-1669-4923-bbea-f40ddb0b40e5

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Date deposited: 27 Jun 2017 16:31
Last modified: 21 Oct 2019 17:48

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Contributors

Author: Stefano Moretti
Author: Diana Rojas
Author: Kei Yagyu

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