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Title: Direct constraints on minimal supersymmetry from Fermi-LAT observations of the dwarf galaxy Segue 1

Abstract

The dwarf galaxy Segue 1 is one of the most promising targets for the indirect detection of dark matter. We examine what constraints 9 months of Fermi-LAT gamma-ray observations of Segue 1 place upon the Constrained Minimal Supersymmetric Standard Model (CMSSM), with the lightest neutralino as the dark matter particle. We also use nested sampling to explore the CMSSM parameter space, simultaneously fitting other relevant constraints from accelerator bounds, the relic density, electroweak precision observables, the anomalous magnetic moment of the muon and B-physics. We include spectral and spatial fits to the Fermi observations, a full treatment of the instrumental response and its related uncertainty, and detailed background models. We also perform an extrapolation to 5 years of observations, assuming no signal is observed from Segue 1 in that time. Our results marginally disfavour models with low neutralino masses and high annihilation cross-sections. Virtually all of these models are however already disfavoured by existing experimental or relic density constraints.

Authors:
 [1];  [1];  [1];  [1];  [2];  [1]
  1. Stockholm Univ. (Sweden). Oskar Klein Centre for Cosmoparticle Physics and Dept. of Physics
  2. Univ. of Montpellier (France). Lab. of Theoretical Physics and Astroparticles
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
Fermi LAT Collaboration
OSTI Identifier:
1357594
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2010; Journal Issue: 01; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; dark matter theory; dwarfs galaxies; supersymmetry and cosmology; gamma ray theory

Citation Formats

Scott, Pat, Conrad, Jan, Edsjö, Joakim, Bergström, Lars, Farnier, Christian, and Akrami, Yashar. Direct constraints on minimal supersymmetry from Fermi-LAT observations of the dwarf galaxy Segue 1. United States: N. p., 2010. Web. doi:10.1088/1475-7516/2010/01/031.
Scott, Pat, Conrad, Jan, Edsjö, Joakim, Bergström, Lars, Farnier, Christian, & Akrami, Yashar. Direct constraints on minimal supersymmetry from Fermi-LAT observations of the dwarf galaxy Segue 1. United States. doi:10.1088/1475-7516/2010/01/031.
Scott, Pat, Conrad, Jan, Edsjö, Joakim, Bergström, Lars, Farnier, Christian, and Akrami, Yashar. Tue . "Direct constraints on minimal supersymmetry from Fermi-LAT observations of the dwarf galaxy Segue 1". United States. doi:10.1088/1475-7516/2010/01/031. https://www.osti.gov/servlets/purl/1357594.
@article{osti_1357594,
title = {Direct constraints on minimal supersymmetry from Fermi-LAT observations of the dwarf galaxy Segue 1},
author = {Scott, Pat and Conrad, Jan and Edsjö, Joakim and Bergström, Lars and Farnier, Christian and Akrami, Yashar},
abstractNote = {The dwarf galaxy Segue 1 is one of the most promising targets for the indirect detection of dark matter. We examine what constraints 9 months of Fermi-LAT gamma-ray observations of Segue 1 place upon the Constrained Minimal Supersymmetric Standard Model (CMSSM), with the lightest neutralino as the dark matter particle. We also use nested sampling to explore the CMSSM parameter space, simultaneously fitting other relevant constraints from accelerator bounds, the relic density, electroweak precision observables, the anomalous magnetic moment of the muon and B-physics. We include spectral and spatial fits to the Fermi observations, a full treatment of the instrumental response and its related uncertainty, and detailed background models. We also perform an extrapolation to 5 years of observations, assuming no signal is observed from Segue 1 in that time. Our results marginally disfavour models with low neutralino masses and high annihilation cross-sections. Virtually all of these models are however already disfavoured by existing experimental or relic density constraints.},
doi = {10.1088/1475-7516/2010/01/031},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 01,
volume = 2010,
place = {United States},
year = {2010},
month = {1}
}

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