amp_method

The option is used to choose the method to calculate the amplitude square. The default method is: It use amplitude square alantica method[#_#> ( amp_method:='amp$ ) in the case of less than four final state particles case, and to use numerical amplitude method[#_#> (amp_method:='tree$ ) in other case. The user can choose the method by adding the following line to input file "process.def".

 amp_method:='tree$, or amp