FERMIONIC DECAYS OF NEUTRAL MSSM HIGGS BOSONS AT THE ONE-LOOP LEVEL

The results of a complete one-loop calculation for the fermionic decay width Gamma(h(0), H-0, A(0) --> <f(f)over bar>) of the neutral MSSM Higgs bosons are presented and the dominant light Higgs decay channel h(0) --> <b(b)over bar> is discussed in detail. The enhancement of T(h(0) --> <b(b)over bar>) compared to the standard Higgs decay is shown for pseudoscalar masses M(A) less than or equal to 300 GeV, where the one-loop contributions in the MSSM and SM are different. Simpler approximation formulae for the Higgs decays are given and their quality is discussed by introducing an effective neutral scalar mixing angle sin(2) alpha(eff). Finally,the Higgs branching ratios in <b(b)over bar>, <c(c)over bar>, tau(+)tau(-) are calculated.