Pseudo-Dirac Bino Dark Matter

Details Pseudo-Dirac Bino Dark Matter Pseudo-Dirac Bino Dark Matter

2007-08-29

arxiv.org/abs/0708.3970v2

Phys.Rev.D77:015004,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 2 figures, REVTEX, to be published in PRD, made minor changes and added comments to match the published version

Scientific paper

10.1103/PhysRevD.77.015004

While the bino-dominated lightest neutralino of the minimal supersymmetric Standard Model (MSSM) is an interesting and widely-studied candidate of the dark matter, the p-wave suppression of its annihilation cross section requires fine-tunings of the MSSM spectra to be consistent with WMAP observations. We propose pseudo-Dirac bino that arises in theories with D-type supersymmetry-breaking as an intriguing alternative candidate of dark matter. The pseudo-Dirac nature of the bino gives a natural mechanism of enhanced co-annihilation because these two states are degenerate in the absence of electroweak symmetry breaking. In addition, the lightest state can be consistent with limits of direct detection experiments because of the lack of vector interactions, as with the case of the MSSM bino.

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