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Phenomenology of Inert Scalar and Supersymmetric Dark Matter
Stockholm University, Faculty of Science, Department of Physics. (CoPS)
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 [en]
Dark matter, inert scalars, supersymmetry, indirect detection, accelerator searches
National Category
Physical Sciences Subatomic Physics Subatomic Physics
Research subject
Theoretical Physics
Identifiers
URN: urn:nbn:se:su:diva-39278ISBN: 978-91-7447-097-0 (print)OAI: oai:DiVA.org:su-39278DiVA: diva2:319303
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
List of papers
1. Neutralino Dark Matter in BMSSM Effective Theory
Open this publication in new window or tab >>Neutralino Dark Matter in BMSSM Effective Theory
Show others...
2009 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 08Article in journal (Refereed) Published
Abstract [en]

We study thermal neutralino dark matter in an effective field theory extension of the MSSM, called ``Beyond the MSSM'' (BMSSM) in Dine, Seiberg and Thomas (2007). In this class of effective field theories, the field content of the MSSM is unchanged, but the little hierarchy problem is alleviated by allowing small corrections to the Higgs/higgsino part of the Lagrangian. We perform parameter scans and compute the dark matter relic density. The light higgsino LSP scenario is modified the most; we find new regions of parameter space compared to the standard MSSM. This involves interesting interplay between the WMAP dark matter bounds and the LEP chargino bound. We also find some changes for gaugino LSPs, partly due to annihilation through a Higgs resonance, and partly due to coannihilation with light top squarks in models that are ruled in by the new effective terms.

Place, publisher, year, edition, pages
IOP Publishing, 2009
Keyword
supersymmetry and cosmology, dark matter theory
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-33940 (URN)10.1088/1475-7516/2009/08/035 (DOI)000270036800035 ()
Available from: 2009-12-30 Created: 2009-12-30 Last updated: 2017-12-12Bibliographically approved
2. Early Search for Supersymmetric Dark Matter Models at the LHC Without Missing Energy
Open this publication in new window or tab >>Early Search for Supersymmetric Dark Matter Models at the LHC Without Missing Energy
2010 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 3, 054- p.Article in journal (Refereed) Published
Abstract [en]

We investigate early discovery signals for supersymmetry at the Large Hadron Collider without using information about missing transverse energy. Instead we use cuts on the number of jets and isolated leptons (electrons and/or muons). We work with minimal supersymmetric extensions of the standard model, and focus on phenomenological models that give a relic density of dark matter compatible with the WMAP measurements. An important model property for early discovery is the presence of light sleptons, and we find that for an integrated luminosity of only 200–300 pb^{−1} at a center-of-mass energy of 10 TeV models with gluino masses up to ~700 GeV can be tested.

National Category
Subatomic Physics Subatomic Physics
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-39273 (URN)10.1007/JHEP03(2010)054 (DOI)000276798203005 ()
Available from: 2010-05-17 Created: 2010-05-17 Last updated: 2017-12-12Bibliographically approved
3. Significant Gamma Lines from Inert Higgs Dark Matter
Open this publication in new window or tab >>Significant Gamma Lines from Inert Higgs Dark Matter
2007 (English)In: Physical Review Letters, Vol. 99, no 041301Article in journal (Refereed) Published
Abstract [en]

One way to unambiguously confirm the existence of particle dark matter and determine its mass would be to detect its annihilation into monochromatic gamma-rays in upcoming telescopes. One of the most minimal models for dark matter is the inert doublet model, obtained by adding another Higgs doublet with no direct coupling to fermions. For a mass between 40 and 80 GeV, the lightest of the new inert Higgs particles can give the correct cosmic abundance of cold dark matter in agreement with current observations. We show that for this scalar dark matter candidate, the annihilation signal of monochromatic γγ and Zγ final states would be exceptionally strong. The energy range and rates for these gamma-ray line signals make them ideal to search for with the soon upcoming GLAST satellite.

Place, publisher, year, edition, pages
American Physical Society, 2007
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-24680 (URN)10.1103/PhysRevLett.99.041301 (DOI)000248345800010 ()
Note
Part of urn:nbn:se:su:diva-7345Available from: 2008-02-07 Created: 2008-02-07 Last updated: 2010-05-19Bibliographically approved
4. Inert Doublet Model and LEP II Limits
Open this publication in new window or tab >>Inert Doublet Model and LEP II Limits
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
National Category
Subatomic Physics Subatomic Physics
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-39270 (URN)10.1103/PhysRevD.79.035013 (DOI)000263816600078 ()
Available from: 2010-05-17 Created: 2010-05-17 Last updated: 2017-12-12Bibliographically approved

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