Different symmetries of a vertex of the same type.

[daniilkrichevskiyDM]

Deal all,
I am sorry in advance if this is not the right place for a question about FeynArts but would be grateful for any advice.

I have the following vertex (see the attached picture).

The first part of this vertex (first two lines) seems to be symmetric under exchange of two 2 vector mesons V or any two pions \pi. This means that I would like to have G[1] for the vertex in the generic file.

However, the third line (which comes from a different part of Lagrangian) is antisymmetric. In this case I would like to have G[-1] for the kinematic structures of this part.

Is it possible to combine these two parts within a single AnalyticalCoupling, or should they be represented in some different way?

Thank you!
Daniil

[vsht]

Hi,

I don't think that nowadays much people (if any) write FeynArts models by hand. FeynRules is the way to go, even though it requires
Mathematica not older than 12.x to run properly.

Cheers,
Vlad

[daniilkrichevskiyDM]

Hi Vald,
Thank you for the information!

Best,
Daniil