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[en] We present low-energy theorems for the calculation of loop amplitudes with external scalar or pseudoscalar Higgs bosons which are light compared to the loop particles. Starting from existing lowest-order versions of these theorems, we show how their applicability may be extended to the two-loop level. To illustrate the usefulness of these theorems, we discuss a number of applications to Higgs production and decay at and beyond the one-loop order. (orig.)
Source
May 1995; 26 p; FERMILAB-PUB--95-081-T; MPI-PHT--95-21; ISSN 0418-9833; 