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How well will ton-scale dark matter direct detection experiments constrain minimal supersymmetry?
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). (Cosmology, Particle Astrophysics and String Theory)
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). (Cosmology, Particle Astrophysics and String Theory)
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). (Cosmology, Particle Astrophysics and String Theory)
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). (Cosmology, Particle Astrophysics and String Theory)
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2011 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 4, 012- p.Article in journal (Refereed) Published
Abstract [en]

Weakly interacting massive particles (WIMPs) are amongst the most interesting dark matter (DM) candidates. Many DM candidates naturally arise in theories beyond the standard model (SM) of particle physics, like weak-scale supersymmetry (SUSY). Experiments aim to detect WIMPs by scattering, annihilation or direct production, and thereby determine the underlying theory to which they belong, along with its parameters. Here we examine the prospects for further constraining the Constrained Minimal Supersymmetric Standard Model (CMSSM) with future ton-scale direct detection experiments. We consider ton-scale extrapolations of three current experiments: CDMS, XENON and COUPP, with 1000 kg-years of raw exposure each. We assume energy resolutions, energy ranges and efficiencies similar to the current versions of the experiments, and include backgrounds at target levels. Our analysis is based on full likelihood constructions for the experiments. We also take into account present uncertainties on hadronic matrix elements for neutralino-quark couplings, and on halo model parameters. We generate synthetic data based on four benchmark points and scan over the CMSSM parameter space using nested sampling. We construct both Bayesian posterior PDFs and frequentist profile likelihoods for the model parameters, as well as the mass and various cross-sections of the lightest neutralino. Future ton-scale experiments will help substantially in constraining supersymmetry, especially when results of experiments primarily targeting spin-dependent nuclear scattering are combined with those directed more toward spin-independent interactions.

Place, publisher, year, edition, pages
2011. no 4, 012- p.
Keyword [en]
dark matter theory, dark matter experiments, cosmology of theories beyond the SM, supersymmetry and cosmology
National Category
Subatomic Physics Astronomy, Astrophysics and Cosmology
Research subject
Theoretical Physics; High Energy Physics; Theoretical Astrophysics
Identifiers
URN: urn:nbn:se:su:diva-57171DOI: 10.1088/1475-7516/2011/04/012ISI: 000291259000012OAI: oai:DiVA.org:su-57171DiVA: diva2:414553
Available from: 2011-05-03 Created: 2011-05-03 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Supersymmetry vis-à-vis Observation: Dark Matter Constraints, Global Fits and Statistical Issues
Open this publication in new window or tab >>Supersymmetry vis-à-vis Observation: Dark Matter Constraints, Global Fits and Statistical Issues
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Weak-scale supersymmetry is one of the most favoured theories beyond the Standard Model of particle physics that elegantly solves various theoretical and observational problems in both particle physics and cosmology. In this thesis, I describe the theoretical foundations of supersymmetry, issues that it can address and concrete supersymmetric models that are widely used in phenomenological studies. I discuss how the predictions of supersymmetric models may be compared with observational data from both colliders and cosmology. I show why constraints on supersymmetric parameters by direct and indirect searches of particle dark matter are of particular interest in this respect. Gamma-ray observations of astrophysical sources, in particular dwarf spheroidal galaxies, by the Fermi satellite, and recording nuclear recoil events and energies by future ton-scale direct detection experiments are shown to provide powerful tools in searches for supersymmetric dark matter and estimating supersymmetric parameters. I discuss some major statistical issues in supersymmetric global fits to experimental data. In particular, I further demonstrate that existing advanced scanning techniques may fail in correctly mapping the statistical properties of the parameter spaces even for the simplest supersymmetric models. Complementary scanning methods based on Genetic Algorithms are proposed.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2011. 142 p.
Keyword
supersymmetry, cosmology of theories beyond the Standard Model, dark matter, gamma rays, dwarf galaxies, direct detection, statistical techniques, scanning algorithms, genetic algorithms, statistical coverage
National Category
Subatomic Physics Astronomy, Astrophysics and Cosmology Subatomic Physics
Research subject
Theoretical Physics
Identifiers
urn:nbn:se:su:diva-57194 (URN)978-91-7447-312-4 (ISBN)
Public defence
2011-06-07, room FA32, AlbaNova University Center, Roslagstullsbacken 21, Stockholm, 13:00 (English)
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Supervisors
Note
At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Submitted.Available from: 2011-05-12 Created: 2011-05-03 Last updated: 2011-06-28Bibliographically approved

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