Large Squark-Mixing Impact on H+ Decay in the MSSM

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We study the decays of the charged Higgs boson H+ within the Minimal Supersymmetric Standard Model. We find that the supersymetric mode 'stop + sbottom-bar' can dominate the H+ decays in a wide range of the model parameters due to the large Yukawa couplings and mixings of stop and sbottom. Compared to the conventional modes 'tau+ nu' and 't b-bar', this mode has very distinctive signatures. This could have a decisive impact on H+ searches at future colliders. We find also that the QCD corrections to the 'stop + sbottom-bar' mode are significant, but that they do not invalidate our tree-level conclusion above.