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Inert Doublet Model and LEP II Limits
Stockholm University, Faculty of Science, Department of Physics. (CoPS)
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
2009 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 79, 035013-1-035013-13 p.Article in journal (Refereed) Published
Abstract [en]

The inert doublet model is a minimal extension of the standard model introducing an additional SU(2) doublet with new scalar particles that could be produced at accelerators. While there exists no LEP II analysis dedicated for these inert scalars, the absence of a signal within searches for supersymmetric neutralinos can be used to constrain the inert doublet model. This translation however requires some care because of the different properties of the inert scalars and the neutralinos. We investigate what restrictions an existing DELPHI Collaboration study of neutralino pair production can put on the inert scalars and discuss the result in connection with dark matter. We find that although an important part of the inert doublet model parameter space can be excluded by the LEP II data, the lightest inert particle still constitutes a valid dark matter candidate

Place, publisher, year, edition, pages
American Physical Society , 2009. Vol. 79, 035013-1-035013-13 p.
National Category
Subatomic Physics Subatomic Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-39270DOI: 10.1103/PhysRevD.79.035013ISI: 000263816600078OAI: oai:DiVA.org:su-39270DiVA: diva2:319285
Available from: 2010-05-17 Created: 2010-05-17 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Phenomenology of Inert Scalar and Supersymmetric Dark Matter
Open this publication in new window or tab >>Phenomenology of Inert Scalar and Supersymmetric Dark Matter
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

While the dark matter has so far only revealed itself through the gravitational influence it exerts on its surroundings, there are good reasons to believe it is made up by WIMPs – a hypothetical class of heavy elementary particles not encompassed by the Standard Model of particle physics.

The Inert Doublet Model constitutes a simple extension of the Standard Model Higgs sector. The model provides a new set of scalar particles, denoted inert scalars because of their lack of direct coupling to matter, of which the lightest is a WIMP dark matter candidate.

Another popular Standard Model extension is that of supersymmetry. In the most minimal scenario the particle content is roughly doubled, and the lightest of the new supersymmetric particles, which typically is a neutralino, is a WIMP dark matter candidate.

In this thesis the phenomenology of inert scalar and supersymmetric dark matter is studied. Relic density calculations are performed, and experimental signatures in indirect detection experiments and accelerator searches are derived.

The Inert Doublet Model shows promising prospects for indirect detection of dark matter annihilations into monochromatic photons. It is also constrained by the old LEP II accelerator data.

Some phenomenological differences between the Minimal Supersymmetric Standard Model and a slight extension, the Beyond the Minimal Supersymmetric Standard Model, can be found. Also, supersymmetric dark matter models can be detected already within the early LHC accelerator data.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2010. 85 p.
Keyword
Dark matter, inert scalars, supersymmetry, indirect detection, accelerator searches
National Category
Physical Sciences Subatomic Physics Subatomic Physics
Research subject
Theoretical Physics
Identifiers
urn:nbn:se:su:diva-39278 (URN)978-91-7447-097-0 (ISBN)
Public defence
2010-06-10, FB52, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Available from: 2010-05-19 Created: 2010-05-17 Last updated: 2010-05-17Bibliographically approved

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