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Early Search for Supersymmetric Dark Matter Models at the LHC Without Missing Energy
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). (CoPS)
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). (CoPS)
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). (CoPS)
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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.

Place, publisher, year, edition, pages
2010. no 3, 054- p.
National Category
Subatomic Physics Subatomic Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-39273DOI: 10.1007/JHEP03(2010)054ISI: 000276798203005OAI: oai:DiVA.org:su-39273DiVA: diva2:319290
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
2. Phenomenological Studies in Cosmoparticle Physics: Expansion Histories in non-Einstein Gravity and Dark Matter at the Large Hadron Collider
Open this publication in new window or tab >>Phenomenological Studies in Cosmoparticle Physics: Expansion Histories in non-Einstein Gravity and Dark Matter at the Large Hadron Collider
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

As the Big Bang model has become established, the fields of cosmology and particle physics have become intertwined. A range of observations forces us to consider the phenomena of dark matter and dark energy. This interpretation is based on our understanding of gravity, while the standard model of particle physics describes the other fundamental forces in nature and fails to explain the dark components. This thesis includes two different types of studies where hypotheses of physics beyond the standard models of particle physics and cosmology are faced with what observations and experiments can tell us.

The first one deals with the possibility that our theory of gravity is what has to be modified at large distances to explain the dark energy, which then need not be a contribution to the energy content at all. The expansion histories in two such frameworks are tested with data from type Ia supernovae and measurements of the baryon acoustic peak in the galaxy distribution as well as in the cosmic microwave background.

The second type of study concerns the possibility of establishing the particle nature of dark matter through interactions other than gravitational. While there are ways of doing this using astrophysical observations, the uncertainties due to astrophysics and the unknown distribution of the dark matter are large. High energy particle colliders provide a way of imitating the conditions of the early universe in the laboratory, where we can hope to produce yet unknown heavy particle states and in a more controlled environment determine their properties. We study the prospects for discovering two types of weakly interacting dark matter candidates at the CERN Large Hadron Collider.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholms University, 2011. 48 p.
National Category
Natural Sciences
Research subject
Theoretical Physics
Identifiers
urn:nbn:se:su:diva-56952 (URN)978-91-7447-302-5 (ISBN)
Public defence
2011-06-01, sal FA32, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Manuscript. Available from: 2011-05-10 Created: 2011-05-02 Last updated: 2011-05-03Bibliographically approved

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Edsjö, JoakimLundström, ErikRydbeck, SaraSjölin, Jörgen
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