Color index inside Mom for ghost-ghost-gluon vertex not updated correctly

[AlexanderVoigt]

Uladzimir Khasianevich found the following bug in SARAH's Vertex function:

Code: Select all

<<SARAH`
Start@"SM"
Vertex[{gG[{ct1}], VG[{ct2, lt2}], bar[gG[{ct3}]]}]
Vertex[{gG[{ct2}], VG[{ct1, lt1}], bar[gG[{ct3}]]}]

The result from the two calls to Vertex is:

Code: Select all

{{gG[{ct1}], VG[{ct2, lt2}], bar[gG[{ct3}]]},
 {g3 fSU3[ct1, ct2, ct3], Mom[gG[{ct1}], lt2]}}

{{gG[{ct2}], VG[{ct1, lt1}], bar[gG[{ct3}]]}, 
 {-g3 fSU3[ct1, ct2, ct3], Mom[gG[{ct1}], lt1]}} (* Problem: should be Mom[gG[{ct2}], lt1] *)

The second one contains an incorrect color index structure in the Mom symbol (see comment in the above output code snippet).

Best regards
Alex