Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-02-04
JCAP0708:014,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
27 pages, 9 figures, references added, version to appear at JCAP
Scientific paper
10.1088/1475-7516/2007/08/014
Almost degenerate bino and wino masses at the weak scale is one of unique features of gauge messenger models. The lightest neutralino is a mixture of bino, wino and higgsino and can produce the correct amount of the dark matter density if it is the lightest supersymmetric particle. Furthermore, as a result of squeezed spectrum of superpartners which is typical for gauge messenger models, various co-annihilation and resonance regions overlap and very often the correct amount of the neutralino relic density is generated as an interplay of several processes. This feature makes the explanation of the observed amount of the dark matter density much less sensitive to fundamental parameters. We calculate the neutralino relic density assuming thermal history and present both spin independent and spin dependent cross sections for the direct detection. We also discuss phenomenological constraints from b to s gamma and muon g-2 and compare results of gauge messenger models to well known results of the mSUGRA scenario.
Bae Kyu Jung
Dermisek Radovan
Do Kim Hyung
Kim Ian-Woo
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