Dark matter in natural supersymmetric extensions of the Standard Model

Details Dark matter in natural supersymmetric extensions of the Standard Model Dark matter in natural supersymmetric extensions of the Standard Model

2010-02-08

arxiv.org/abs/1002.1646v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages, 8 figures, references added

Scientific paper

We explore the dark matter sector in extensions of the Minimal Supersymmetric Standard Model (MSSM) that can provide a good fit to the PAMELA cosmic ray positron excess, while at the same time addressing the little hierarchy problem of the MSSM. Adding a singlet Higgs superfield, S, can account for the observed positron excess, as recently discussed in the literature, but we point out that it requires a fine-tuned choice for the parameters of the model. We find that including an additional singlet allows both a reduction of the weak-scale fine-tuning, and an interpretation of the cosmic ray observations in terms of dark matter annihilations in the galactic halo. Our setup contains a light axion, but does not require light CP-even scalars in the spectrum.

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