Radiative corrections to the Higgs boson decay rate $\Gamma (H\to ZZ)$ in the minimal supersymmetric model

Abstract

We consider radiative corrections to the decay rate $\Gamma (H\to ZZ)$ of the heavy {\it CP}-even Higgs boson of the minimal supersymmetric model to two $Z$ bosons. We perform a one loop Feynman diagram calculation in the on-mass-shell renormalization scheme, and include the third generation of quarks and squarks. The tree level rate is suppressed by a mixing angle factor and decreases as $1/M_H$ for large $M_H$. The corrected rate overcomes this suppression and increases with $M_H$ for $M_H>500$~GeV. The corrections can be very large and depend in detail on the top squark masses and $A$-term, as well as the supersymmetric Higgs mass parameter $\mu$.

22 pages, 9 figures available from authors, UCB-PTH-92/23 and LBL-32498

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