Stückelino dark matter in anomalous U(1)′ models

We study a possible dark matter candidate in the framework of a minimal anomalous U (1)′ extension of the MSSM. It turns out that in a suitable decoupling limit the Stückelino, the fermionic degree of freedom of the Stückelberg multiplet, is the lightest supersymmetric particle (LSP). We compute the...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2010-10, Vol.69 (3-4), p.455-465
Main Authors: Fucito, Francesco, Lionetto, Andrea, Mammarella, Andrea, Racioppi, Antonio
Format: Article
Language:English
Subjects:
Analysis
Anisotropy
Astronomy
Astrophysics and Cosmology
Big Bang theory
Dark matter
Decoupling
Density
Elementary Particles
Exact sciences and technology
Hadrons
Heavy Ions
Measurement Science and Instrumentation
Microwave Anisotropy Probe
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Regular Article - Theoretical Physics
String Theory
Supersymmetry
The physics of elementary particles and fields
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Summary:We study a possible dark matter candidate in the framework of a minimal anomalous U (1)′ extension of the MSSM. It turns out that in a suitable decoupling limit the Stückelino, the fermionic degree of freedom of the Stückelberg multiplet, is the lightest supersymmetric particle (LSP). We compute the relic density of this particle including coannihilations with the next to lightest supersymmetric particle (NLSP) and with the next to next to lightest supersymmetric particle (NNLSP), which are assumed to be almost degenerate in mass. This assumption is needed in order to satisfy the stringent limits that the Wilkinson Microwave Anisotropy Probe (WMAP) puts on the relic density. We find that the WMAP constraints can be satisfied by different NLSP and NNLSP configurations as a function of the mass gap with the LSP. These results hold in the parameter space region where the model remains perturbative.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-010-1416-1