Thermal relic abundances of long-lived staus

Details Thermal relic abundances of long-lived staus Thermal relic abundances of long-lived staus

2008-08-18

arxiv.org/abs/0808.2462v3

Nucl.Phys.B809:318-346,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

34 pages, 8 figures; one reference added; matches published version

Scientific paper

10.1016/j.nuclphysb.2008.10.009

In supersymmetric models with a long-lived stau being the lightest Standard Model superpartner, the stau abundance during primordial nucleosynthesis is tightly constrained. Considering the complete set of stau annihilation channels in the minimal supersymmetric Standard Model (MSSM) with real parameters for scenarios in which sparticle coannihilations are negligible, we calculate the decoupling of the lighter stau from the primordial plasma and identify processes which are capable to deplete the resulting stau abundance significantly. We find particularly efficient stau annihilation at the resonance of the heavy CP-even Higgs boson and for a lighter stau with a sizeable left-right mixing due to enhanced stau-Higgs couplings. Even within the constrained MSSM, we encounter both effects leading to exceptionally small values of the resulting stau abundance. Prospects for collider phenomenology are discussed and possible implications of our findings are addressed with emphasis on gravitino dark matter scenarios.

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