Supersymmetric models with an additional singlet field offer the Higgs boson the possibility to decay to two pseudoscalars, a. If the mass of these pseudoscalars is above the bb̄ threshold, a→bb̄ is generically the dominant decay mode. The decay h→aa→bb̄bb̄ may be seen above backgrounds at the Tevatron if the Higgs production cross section is enhanced relative to that of the standard model.
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Stelzer et al. (2007) studied this question.
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