Self-interactions of the lightest MSSM Higgs boson in the large pseudoscalar-mass limit

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  • 1 August 2002
Abstract
We investigate the decoupling properties of the Higgs-sector-induced one-loop corrections in the lightest Higgs-boson self-couplings, in the framework of the Minimal Supersymmetric Standard Model. The renormalized n-point vertex functions with external Higgs particles in the MSSM and in the SM are derived to one-loop level and compared in the MA >> MZ limit. The computation has been done in a generic R_{xi} gauge and the on-shell renormalization scheme is chosen. By the comparison of the renormalized lightest Higgs boson h^0 vertex functions with respect to the corresponding SM ones, we have found that the differences between the predictions of both models are summarized in the lightest Higgs-boson mass correction, Delta Mh. Consequently, the radiative corrections are absorbed in the Higgs-boson mass, and the trilinear and quartic h^0 self-couplings acquire the same structure of the couplings of the SM Higgs-boson. Therefore, decoupling of the heavy MSSM Higgs bosons occurs and the MSSM h^0 self-interactions converge to the SM ones in the MA >> MZ limit.

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