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Higgs properties in a broken Inert Doublet Model
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Lund University.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
2013 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 8, 079Article in journal (Refereed) Published
Abstract [en]

We consider a model for the Higgs sector with two scalar doublets and a softly broken Z2 symmetry, the Stealth Doublet Model. This model can be seen as a generalization of the Inert Doublet Model. One of the doublets is the Higgs doublet that participates in electroweak symmetry breaking and couples to fermions. The other doublet does not couple to fermions at tree level and does not acquire a vacuum expectation value. The broken Z2 symmetry leads to interesting phenomenology such as mixing between the two doublets and charged and CP-odd scalars that can be light and have unusual decay channels. We present theoretical and experimental constraints on the model and consider the recent observation of a Higgs boson at the LHC. The data on the H→ γγ channel can be naturally accommodated in the model, with either the lightest or the heaviest CP-even scalar playing the role of the observed particle.

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2013. Vol. 8, 079
National Category
Subatomic Physics
Research subject
Physics with specialization in Elementary Particle Physics
Identifiers
URN: urn:nbn:se:uu:diva-201544DOI: 10.1007/JHEP08(2013)079ISI: 000324113700079OAI: oai:DiVA.org:uu-201544DiVA: diva2:627935
Funder
Swedish Research Council, 2007-4071
Note

Erratum in Journal of High Energy Physics 2015:87, doi:10.1007/JHEP01(2015)087.

Available from: 2013-06-12 Created: 2013-06-12 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Phenomenology of Higgs Bosons Beyond the Standard Model
Open this publication in new window or tab >>Phenomenology of Higgs Bosons Beyond the Standard Model
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

After a long history of searches, a Higgs boson H was discovered by the ATLAS and the CMS experiments at the Large Hadron Collider (LHC) in 2012. Its properties fit well the ones predicted by the Standard Model (SM) of particle physics. However, the SM can not explain other established properties of Nature, such as the existence of Dark Matter. For this reason, models beyond the SM should be considered. Such models often predict the existence of several Higgs bosons and this thesis explores some of those models. In particular, the possibility to discover a charged Higgs boson, which would be a clear sign of physics beyond the SM, is studied.

A commonly studied extension of the SM is the framework of two-Higgs-doublet models (2HDMs), where there are five Higgs bosons. By confronting the parameter spaces of some 2HDMs with publically available data from the LHC, the prospects for finding the 2HDM Higgs bosons is presented through the calculation of production cross sections and decay branching ratios in various channels.

A new kind of 2HDM, called the Stealth Doublet Model is presented and the properties of the Higgs bosons are studied. In this model, it is shown that in particular the properties of the charged Higgs boson H± have new features not exhibited in earlier studied models. Within the parameter space compatible with the LHC results, the production cross section for H± can be sizeable enough to be experimentally observed.

Finally, the discovery prospects at the LHC, for a H± in the pptH± process, with the decays H±HW± and Hbb, is studied in various models beyond the Standard Model. It is shown that for the supersymmetric models, this channel is beyond the discovery reach of the LHC. In some of the other studied models, in particular the Aligned 2HDM, the situation is improved and the channel is feasible.

Place, publisher, year, edition, pages
Uppsala: Uppsala universitet, 2015. 59 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1217
Keyword
Particle physics, The Standard Model, Higgs bosons, Higgs mechanism, Beyond the Standard Model, Two Higgs Doublet Models, Charged Higgs boson, Higgs decays, Supersymmetry, Renormalization, LHC, Collider constraints
National Category
Subatomic Physics
Research subject
Physics with specialization in Elementary Particle Physics
Identifiers
urn:nbn:se:uu:diva-240617 (URN)978-91-554-9138-3 (ISBN)
Public defence
2015-02-27, Sal Å2001, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2015-02-06 Created: 2015-01-08 Last updated: 2015-03-09

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Enberg, RikardWouda, Glenn

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