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Phenomenology of the Inert (2+1) and (4+2) Higgs Doublet Models

Phenomenology of the Inert (2+1) and (4+2) Higgs Doublet Models
Phenomenology of the Inert (2+1) and (4+2) Higgs Doublet Models
We make a phenomenological study of a model with two inert doublets plus one Higgs doublet (I(2+1)HDM) which is symmetric under a Z$_2$ group, preserved after Electro-Weak Symmetry Breaking (EWSB) by the vacuum alignment $(0,0,v)$. This model may be regarded as an extension to the model with one inert doublet plus one Higgs doublet (I(1+1)HDM), by the addition of an extra inert scalar doublet. The neutral fields from the two inert doublets provide a viable Dark Matter (DM) candidate which is stabilised by the conserved $Z_2$ symmetry. We study the new Higgs decay channels offered by the scalar fields from the extra doublets and their effect on the Standard Model (SM) Higgs couplings, including a new decay channel into photon(s) plus missing energy, which distinguishes the I(2+1)HDM from the I(1+1)HDM. Motivated by Supersymmetry, which requires an even number of doublets, we then extend this model into a model with four inert doublets plus two Higgs doublets (I(4+2)HDM) and study the phenomenology of the model with the vacuum alignment $(0,0,0,0,v,v)$. This scenario offers a wealth of Higgs signals, the most distinctive ones being cascade decays of heavy Higgs states into inert ones. Finally, we also remark that the smoking-gun signature of all the considered models is represented by invisible Higgs decays into the lightest inert Higgs bosons responsible for DM.
hep-ph
1550-7998
Keus, Venus
f56212de-96d7-4955-8c56-561910f7f167
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
Keus, Venus
f56212de-96d7-4955-8c56-561910f7f167
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614

Keus, Venus, King, Stephen F. and Moretti, Stefano (2014) Phenomenology of the Inert (2+1) and (4+2) Higgs Doublet Models. Physical Review D. (doi:10.1103/PhysRevD.90.075015).

Record type: Article

Abstract

We make a phenomenological study of a model with two inert doublets plus one Higgs doublet (I(2+1)HDM) which is symmetric under a Z$_2$ group, preserved after Electro-Weak Symmetry Breaking (EWSB) by the vacuum alignment $(0,0,v)$. This model may be regarded as an extension to the model with one inert doublet plus one Higgs doublet (I(1+1)HDM), by the addition of an extra inert scalar doublet. The neutral fields from the two inert doublets provide a viable Dark Matter (DM) candidate which is stabilised by the conserved $Z_2$ symmetry. We study the new Higgs decay channels offered by the scalar fields from the extra doublets and their effect on the Standard Model (SM) Higgs couplings, including a new decay channel into photon(s) plus missing energy, which distinguishes the I(2+1)HDM from the I(1+1)HDM. Motivated by Supersymmetry, which requires an even number of doublets, we then extend this model into a model with four inert doublets plus two Higgs doublets (I(4+2)HDM) and study the phenomenology of the model with the vacuum alignment $(0,0,0,0,v,v)$. This scenario offers a wealth of Higgs signals, the most distinctive ones being cascade decays of heavy Higgs states into inert ones. Finally, we also remark that the smoking-gun signature of all the considered models is represented by invisible Higgs decays into the lightest inert Higgs bosons responsible for DM.

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More information

Published date: 16 October 2014
Additional Information: 45 pages, 10 figures, references added
Keywords: hep-ph
Organisations: Theory Group

Identifiers

Local EPrints ID: 410256
URI: http://eprints.soton.ac.uk/id/eprint/410256
ISSN: 1550-7998
PURE UUID: 90839edc-003d-49cd-afcb-8f616399ad1c

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Date deposited: 06 Jun 2017 04:03
Last modified: 13 Mar 2019 19:54

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