Four-fermion interaction and vertices
Dear MadGraph experts,
I was going to derive the 4-fermion vertices in Feynrules and to pass the generated model further to MadGraph. According to the most usable model, the contact interaction is described by four-fermions Lagrangian of the general form as follows: f¯ γμ f f¯ γμ f.
Eventually, after trying few more straightforward ways, obtaining the Lagrangian in the form Llqlq=(l γμ l¯)(q¯ γμ q)
from SMEFT package seemed to have succeeded. This is two-lepton two-quark interaction defined as "lq1" term in the SMEFT model.
However, the FeynRules producing outputs to MadGraph ended up with warnings: "Multi-Fermion operators are not yet fully supported!"
My question is: Is there a way to implement 4-fermion interaction with point-like propagator in MadGraph? Can it be done with FeynRules or any other tool?
Thanks a lot for any your help. Kristina
Question information
- Language:
- English Edit question
- Status:
- Answered
- Assignee:
- No assignee Edit question
- Last query:
- Last reply:
Can you help with this problem?
Provide an answer of your own, or ask Krystsina for more information if necessary.