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

Abstract

A detailed analysis of the top-quark/squark quantum corrections to the\nlightest CP-even Higgs boson (h^0) self-couplings is presented in the MSSM. By\nconsidering the leading one-loop Yukawa-coupling contributions of O(m_t^4), we\ndiscuss the decoupling behaviour of these corrections when the top-squarks are\nheavy compared to the electroweak scale. As shown analytically and numerically,\nthe large corrections can almost completely be absorbed into the h^0-boson\nmass. Our conclusion is that the h^0 self-couplings remain similar to the\ncoupling of the SM Higgs boson for a heavy top-squark sector.\n