Higgs production by gluon fusion in the standard model and in the supersymmetry

In the second chapter the standard model is described. Beside the theoretical foundations with the two-Higgs doublet model also an extension of the SM is discussed. The third chapter deals with supersymmetry and the minimal supersymmetric standard model. The Fortran program SusHi is presented in chapter four. Chapter five treats the renormalization of the sbottom sector and the bottom mass. It is described, which renormalization schemes are maid available in SusHi. In the sixth chapter we present our results for inclusive cross sections. Thereby the most important production channels, gluon fusion and bottom-quark annihilation are considered and compared. Differential distributions we discuss in the seventh chapter. Thereby mainly the resummation of logarithms is discussed. Beside an analytic resummation also the POWHEG formalism is described. The results of both methods are presented and compared.