Impact of squark pair decay modes on search for supersymmetric neutral Higgs bosons

We present a detailed study of the decays of the neutral Higgs bosons H0 and A0 within the Minimal Supersymmetric Standard Model. We find that the supersymmetric modes tt and bb can dominate the H0 and A0 decays in a wide range of the model parameters due to large Yukawa couplings and mixings of t and b. Compared to the conventional modes tt and bb, these modes have very distinctive signatures. This could have a decisive impact on the neutral Higgs boson searches at future colliders.