Dear Florian,

It seems to me that "subArgs" should be pre-defined in PreSARAH_package.m to make it works for massive Z boson.

Otherwise the later "/. subArgs" will result in failure of replacement.

(* pre-definition for Z-boson *)
subArgs={};
(* pre-definition for Z-boson *)

If[subMasslessBoson=!={},
...
subArgs=subMasslessBosonsArgs/. {ARG1->arg1,ARG2->arg2,ARG3->arg3} //. subfinal;
];


Best regards
Peiwen

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Peiwen Wu (吴 培文)
Research Fellow
Korea Institute for Advanced Study (KIAS)
Email (KIAS): pwwu@kias.re.kr
Email (Personal): peiwen.wu123@gmail.com
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Thanks, I'll have a look