Higgs boson decays in the Complex MSSM
Abstract
The analysis of the Higgs search results at LEP showed that a part of the MSSM parameter space with non-zero complex phases could not be excluded, where the lightest neutral Higgs boson, h1, has a mass of only about 45 GeV and the second lightest neutral Higgs boson, h2, has a sizable branching fraction into a pair of h1 states. Full one-loop results for the Higgs cascade decay h2 --> h1 h1 are presented and combined with two-loop Higgs propagator corrections taken from the program FeynHiggs. Using the improved theoretical prediction to analyse the limits on topological cross sections obtained at LEP, the existence of an unexcluded region at low Higgs mass is confirmed. The effect of the genuine vertex corrections on the size and shape of this region is discussed.