Abstract
We discuss a generalization of the minimal supersymmetric extension of the Standard Model in the form of three additional singlet superfields, which would explain the essential features of the CDF multi-muon events presented recently: a large production cross section of ~ 100 pb originates from the production of a CP-odd scalar A with a mass in the 70–80 GeV range and a large value of tan β ~ 40. The CP-odd scalar A decays dominantly into CP-odd and CP-even scalars a1 and h1, which generate decay cascades h1 → 2h2 → 4a2 → 8τ, and a1 → h1 a2 with h1 decaying as above. The decay a2 → τ+τ- is slow, leading to a lifetime of [Formula: see text]. The phenomenology of the model differs from similar scenarios presented before in that one of the two cascades leads to 10 instead of 8 τ-leptons, and additional production processes like associate A production with [Formula: see text] pairs are relevant.
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