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A detailed analysis of the top-quark/squark quantum corrections to thelightest CP-even Higgs boson (h^0) self-couplings is presented in the MSSM. Byconsidering the leading one-loop Yukawa-coupling contributions of O(m_t^4), wediscuss the decoupling behaviour of these corrections when the top-squarks areheavy compared to the electroweak scale. As shown analytically and numerically,the large corrections can almost completely be absorbed into the h^0-bosonmass. Our conclusion is that the h^0 self-couplings remain similar to thecoupling of the SM Higgs boson for a heavy top-squark sector.Comment: LaTeX, 19 pages, 3 figures included. A few minor changes and  references adde

Yukawa coupling quantum corrections to the self-couplings of the lightest MSSM Higgs boson