Higgs phenomenology in the stealth doublet model
(2015) In Physical Review D (Particles, Fields, Gravitation and Cosmology) 91(9).- Abstract
- We analyze a model for the Higgs sector with two scalar doublets and a Z(2) symmetry that is manifest in the Yukawa sector but broken in the potential. Thus, one of the doublets breaks the electroweak symmetry and has tree-level Yukawa couplings to fermions, whereas the other doublet has no vacuum expectation value and no tree-level couplings to fermions. Since the Z(2) parity is broken the two doublets can mix, which leads to a distinct and novel phenomenology. This stealth doublet model can be seen as a generalization of the inert doublet model with a broken Z(2) symmetry. We outline the model and present constraints from theory, electroweak precision tests, and collider searches, including the recent observation of a Higgs boson at the... (More)
- We analyze a model for the Higgs sector with two scalar doublets and a Z(2) symmetry that is manifest in the Yukawa sector but broken in the potential. Thus, one of the doublets breaks the electroweak symmetry and has tree-level Yukawa couplings to fermions, whereas the other doublet has no vacuum expectation value and no tree-level couplings to fermions. Since the Z(2) parity is broken the two doublets can mix, which leads to a distinct and novel phenomenology. This stealth doublet model can be seen as a generalization of the inert doublet model with a broken Z(2) symmetry. We outline the model and present constraints from theory, electroweak precision tests, and collider searches, including the recent observation of a Higgs boson at the LHC. The charged scalar H-+/- and the CP-odd scalar A couple to fermions at one-loop level. We compute the decays of H-perpendicular to and A and in particular the one-loop decays A -> f (f) over bar, H-perpendicular to -> f (f) over bar', H-+/- -> W-+/- Z and H-+/- -> W-+/-gamma. We also describe how to calculate and renormalize such processes in our model. We find that if one of H-+/- or A is the lightest scalar, H-+/- -> W-+/-gamma or A -> b (b) over bar are typically their respective dominating decay channels. Otherwise, the dominating decays of H-+/- and A are into a scalar and a vector. Due to the absence of tree-level fermion couplings for H-+/- and A, we consider pair production and associated production with vector bosons and scalars at the LHC. If the parameter space of the model that favors H-+/- -> W-+/-gamma. is realized in Nature, we estimate that there could be a considerable amount of such events in the present LHC data. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/7433029
- author
- Enberg, Rikard ; Rathsman, Johan LU and Wouda, Glenn
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review D (Particles, Fields, Gravitation and Cosmology)
- volume
- 91
- issue
- 9
- article number
- 095002
- publisher
- American Physical Society
- external identifiers
-
- wos:000353774700002
- scopus:84929376708
- ISSN
- 1550-2368
- DOI
- 10.1103/PhysRevD.91.095002
- language
- English
- LU publication?
- yes
- id
- 354198ce-919c-43b5-9389-1205e486288a (old id 7433029)
- date added to LUP
- 2016-04-01 09:58:19
- date last changed
- 2024-01-06 04:44:46
@article{354198ce-919c-43b5-9389-1205e486288a,
abstract = {{We analyze a model for the Higgs sector with two scalar doublets and a Z(2) symmetry that is manifest in the Yukawa sector but broken in the potential. Thus, one of the doublets breaks the electroweak symmetry and has tree-level Yukawa couplings to fermions, whereas the other doublet has no vacuum expectation value and no tree-level couplings to fermions. Since the Z(2) parity is broken the two doublets can mix, which leads to a distinct and novel phenomenology. This stealth doublet model can be seen as a generalization of the inert doublet model with a broken Z(2) symmetry. We outline the model and present constraints from theory, electroweak precision tests, and collider searches, including the recent observation of a Higgs boson at the LHC. The charged scalar H-+/- and the CP-odd scalar A couple to fermions at one-loop level. We compute the decays of H-perpendicular to and A and in particular the one-loop decays A -> f (f) over bar, H-perpendicular to -> f (f) over bar', H-+/- -> W-+/- Z and H-+/- -> W-+/-gamma. We also describe how to calculate and renormalize such processes in our model. We find that if one of H-+/- or A is the lightest scalar, H-+/- -> W-+/-gamma or A -> b (b) over bar are typically their respective dominating decay channels. Otherwise, the dominating decays of H-+/- and A are into a scalar and a vector. Due to the absence of tree-level fermion couplings for H-+/- and A, we consider pair production and associated production with vector bosons and scalars at the LHC. If the parameter space of the model that favors H-+/- -> W-+/-gamma. is realized in Nature, we estimate that there could be a considerable amount of such events in the present LHC data.}},
author = {{Enberg, Rikard and Rathsman, Johan and Wouda, Glenn}},
issn = {{1550-2368}},
language = {{eng}},
number = {{9}},
publisher = {{American Physical Society}},
series = {{Physical Review D (Particles, Fields, Gravitation and Cosmology)}},
title = {{Higgs phenomenology in the stealth doublet model}},
url = {{http://dx.doi.org/10.1103/PhysRevD.91.095002}},
doi = {{10.1103/PhysRevD.91.095002}},
volume = {{91}},
year = {{2015}},
}