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Higgs phenomenology in the stealth doublet model

Enberg, Rikard; Rathsman, Johan LU and Wouda, Glenn (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)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review D (Particles, Fields, Gravitation and Cosmology)
volume
91
issue
9
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
2015-06-24 13:01:34
date last changed
2017-09-10 03:03:41
@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.},
  articleno    = {095002},
  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},
  volume       = {91},
  year         = {2015},
}