The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here:

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Johan Rathsman. Photo.

Johan Rathsman

Senior lecturer

Johan Rathsman. Photo.

Higgs phenomenology in the stealth doublet model


  • Rikard Enberg
  • Johan Rathsman
  • Glenn Wouda

Summary, in English

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.


  • Theoretical Particle Physics

Publishing year





Physical Review D (Particles, Fields, Gravitation and Cosmology)





Document type

Journal article


American Physical Society


  • Subatomic Physics




  • ISSN: 1550-2368