missing fermion loop in EW NLO
Asked by
yoshi
Dear all,
I have tried
import model loop_qcd_qed_sm
generate e+ e- > e+ e- a [QED]
using MG5_aMC_v2.3.3.
However, I noticed that there are missing diagrams which contains a fermion loop with three photons being attached to it (two propagator photons and 1 final state photon).
I think those diagrams are part of NLO corrections to "e+ e- > e+ e- a" process. Do you have any idea why those loop diagrams are absent?
Yoshitaro Takaesu
Question information
- Language:
- English Edit question
- Status:
- Open
- Assignee:
- Valentin Hirschi Edit question
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