mssm: FR and V4 cross-chek
Dear MG-Team:
I obtained an awkward diagram counting while cross-checking different versions of MSSM in MG. I tried to narrow down chances by using the following input cards which happens to reproduce it:
import model_v4(model) mssm_v4(mssm)
define st = t1 t1~ t2 t2~
generate st > st g
Feynman diag counting of 4(6) for mssm_v4(mssm)
extra diagrams were associated to the gluon emission which changes squark mass eigenstate:
stop_1 -> stop_2 + g
I am not sure if this is a feature introduced by model author in MSSM FR (flipping mass eigenstate, taste like flavour changing current, loops atc... but it is not quite so). It looks like a bug to me. Since I am not an expert, I am posting it as a question and letting you know.
I tried for other squark flavour as:
define sq = ul ul~ ur ur~
generate sq > sq g
ad in those cases it looks fine, 4 diagrams regardless the model used
best regards,
arian
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