Radiative $b$ Decays and the Detection of Supersymmetric Dark Matter

The upper bond on the branching ratio for $b\to sγ$ decays implies a stringent lower bound on the mass of the pseudoscalar Higgs boson of the MSSM if sparticles are heavy. This leads to an upper bound on the expected event rate in experiments searching for heavy supersymmetric dark matter. Scenarios with lighter sparticle spectrum and light pseudoscalar Higgs boson are still possible, but only if $μ< 0$, which again implies a small LSP counting rate.

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