Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-11-26
Phys.Rev.D73:035010,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages, 6 figures, title is changed, introduction is extended, sec.2 is moved to appendix, some references are added, publis
Scientific paper
10.1103/PhysRevD.73.035010
We consider a singlino dominated neutralino in supersymmetric models with an extra U(1). In case both the $\mu$ term and also the $Z^\prime$ mass are generated by the vacuum expectation value of the scalar component of the same singlet chiral superfield, generically the lightest neutralino is not expected to be dominated by the singlino. However, if the gaugino corresponding to the extra U(1) is sufficiently heavy, the lightest neutralino can be dominated by the singlino and still satisfy the constraints resulting from the $Z^\prime$ phenomenology. We assume a supersymmetry breaking scenario in which the extra U(1) gaugino can be much heavier than other gauginos. In that framework we show that the singlino dominated lightest neutralino may be a good candidate for dark matter in a parameter space where various phenomenological constraints are satisfied.
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