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Radiative Corrections to the Neutralino Dark Matter Relic Density - an Effective Coupling Approach
Chatterjee A., Drees M., Kulkarni S.
Physical Review D 86 (2012) 105025 - http://hal.in2p3.fr/in2p3-00740359
Physique/Physique des Hautes Energies - Phénoménologie
Radiative Corrections to the Neutralino Dark Matter Relic Density - an Effective Coupling Approach
A. Chatterjee1, M. Drees1, S. Kulkarni2
1 :  Physikalisches Institut and Bethe Center for Theoretical Physics, Universität Bonn
Bonn Universität - University of Bonn
Physikalisches Institut and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany
Allemagne
2 :  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
http://lpsc.in2p3.fr
CNRS : UMR5821 – IN2P3 – Université Joseph Fourier - Grenoble I – Institut Polytechnique de Grenoble - Grenoble Institute of Technology
53 avenue des Martyrs - 38026 Grenoble Cedex
France
In the framework of the minimal cosmological standard model, the $\Lambda$CDM model, the Dark Matter density is now known with an error of a few percent; this error is expected to shrink even further once PLANCK data are analyzed. Matching this precision by theoretical calculations implies that at least leading radiative corrections to the annihilation cross section of the dark matter particles have to be included. Here we compute one kind of large corrections in the context of the minimal supersymmetric extension of the Standard Model: corrections associated with two-point function corrections on chargino and neutralino lines. These can be described by effective chargino/neutralino-fermion-sfermion and chargino/neutralino-chargino/neutralino-Higgs couplings. We also employ one-loop corrected chargino and neutralino masses, using a recently developed version of the on-shell renormalization scheme. The resulting correction to the predicted Dark Matter density depends strongly on parameter space, but can easily reach 3%.

Articles dans des revues avec comité de lecture
2012
Physical Review D (Phys. Rev. D)
Publisher American Physical Society
ISSN 1550-7998 (eISSN : 1550-2368)
86
105025

LPSC12286
37 pages, 6 figures
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1209.2328