Deflected Anomaly Mediation and Neutralino Dark Matter

Details Deflected Anomaly Mediation and Neutralino Dark Matter Deflected Anomaly Mediation and Neutralino Dark Matter

2006-11-08

arxiv.org/abs/hep-ph/0611098v2

Phys.Rev.D75:025026,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 6 figures, submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.75.025026

We study the phenomenology of the neutralino dark matter in the so called deflected anomaly mediation scenario. This scheme is obtained from the minimal anomaly mediated scenario by introducing a gauge mediated sector with $N_f$ messenger fields. Unlike the former scheme the latter has no tachyons. We find that the neutralino is still the LSP in a wide region of the parameter space: it is essentially a pure bino in the scenario with $N_f=1$ while it can also be a pure higgsino for $N_f>1$. This is very different from the naive anomaly mediated scenario which predicts a wino like neutralino. Moreover we do not find any tachyonic scalars in this scheme. After computing the relic density (considering all the possible coannihilations) we find that there are regions in the parameter space with values compatible with the latest WMAP results with no need to consider moduli fields that decay in the early universe.

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