Higgs Particle Decays in Supersymmetry

Abstract

We present a detailed study of the decays of the Higgs bosons $H^{+}$, $H^0$, and $A^0$ within the Minimal Supersymmetric Standard Model including SUSY--QCD corrections. We find that the supersymmetric modes $\tilde{t}\overline{\stackrel{~}{b}}$ ($\tilde{t}\overline{\stackrel{~}{t}}$, and for large $\tan \beta$ $\tilde{b}\overline{\stackrel{~}{b}}$) can dominate the $H^{+}$ ($H^0$, $A^0$) decays in a wide range of the model parameters due to the large Yukawa couplings and mixings of $\tilde{t}$ and $\tilde{b}$. Compared to the conventional modes $H^{+}\to {\tau }^{+}{\nu }_{\tau },t\bar{b}$, and $H^0,A^0\to t\bar{t},b\bar{b}$, the supersymmetric modes can have an important impact on the Higgs boson searches at future colliders.

6 pages, LaTeX, 2 figures, uses epsfig, format changed to plain article, contents unchanged