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A light second Higgs doublet in light of LHC data
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Stockholm University.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

We confront the general, CP-conserving, two-Higgs-doublet model (2HDM) with Yukawa couplings of Types I–IV with all the data present from run-I of the LHC. For the allowed regions of parameter space, we investigate to what extent there can still exist relatively light scalars, and under which conditions they may be within discovery reach for upcoming LHC runs.

Keywords [en]
Higgs Bosons, LHC, Beyond the Standard Model, Two Higgs Doublet Models
National Category
Subatomic Physics
Research subject
Physics with specialization in Elementary Particle Physics
Identifiers
URN: urn:nbn:se:uu:diva-240603OAI: oai:DiVA.org:uu-240603DiVA, id: diva2:776822
Available from: 2015-01-08 Created: 2015-01-08 Last updated: 2015-03-09
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. p. 59
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1217
Keywords
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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