Higgs phenomenology in the Stealth Doublet Model [Elektronisk resurs]
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Enberg, Rikard (författare)
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Rathsman, Johan (författare)
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Wouda, Glenn (författare)
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Uppsala universitet Teknisk-naturvetenskapliga vetenskapsområdet (utgivare)
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Theoretical high energy physics (medarbetare)
- 2015
- Engelska.
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Ingår i: Physical Review D. - 1550-7998. ; 91
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Sammanfattning
Ämnesord
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- We analyze a model for the Higgs sector with two scalar doublets and a softly broken Z2 symmetry. One of the doublets breaks the electroweak symmetry and has tree-level Yukawa couplings to fermions. The other doublet has no vacuum expectation value and no tree-level couplings to fermions. Because the Z2 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 Z2 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 CP-odd scalar A and the charged scalar H± couple to fermions at one-loop level. We compute the decays of A and H± and in particular the one-loop decays A→ff¯, H±→ff¯′, H±→W±Z and H±→W±γ. 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±γ or A→bb¯ are typically their respective dominating decay channels. Otherwise, the dominating decays of H± and Aare 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±γ is realized in Nature, we estimate that there should be a considerable amount of such events in the present LHC data.
Ämnesord
- Natural Sciences (hsv)
- Physical Sciences (hsv)
- Subatomic Physics (hsv)
- Naturvetenskap (hsv)
- Fysik (hsv)
- Subatomär fysik (hsv)
- Theoretical Physics (uu)
- Teoretisk fysik (uu)
- Fysik med inriktning mot elementarpartikelfysik (uu)
- Physics with specialization in Elementary Particle Physics (uu)
Indexterm och SAB-rubrik
- Higgs boson
- extended Higgs sector
- Large Hadron Collider
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