Generic File error

[SimoneTentori]

Dear all,

I am using FeynCalc 9.3.1.

I am trying to check an amplitude compute with Feynarts+FormCalc using a FeynArts model that I have created using FeynRules.
The model works in the FeynArts+FormCalc setup, unfortunately when I try to create the FA amplitude after

$LoadAddOns = {"FeynArts"}

I obtain the error

**
TagSetDelayed::tagnf: Tag FourVector not found in -Overscript[mom_, ]^mu.
**

That seems to refer to the first line of .gen model. The error is not clear to me, how could I solve it?

Many thanks,
Simone

P.S. I attached the .gen and .mod files
Modmod.txt
Modgen.txt

[vsht]

Hi, you need to patch your model before using it with FeynCalc https://feyncalc.github.io/FeynCalcBook/Extra/CustomModels.html Cheers, Vlad Am 24.06.24 um 16:53 schrieb Simone Tentori:

…

Dear all, I am using FeynCalc 9.3.1. I am trying to check an amplitude compute with Feynarts+FormCalc using a FeynArts model that I have created using FeynRules. The model works in the FeynArts+FormCalc setup, unfortunately when I try to create the FA amplitude after |$LoadAddOns = {"FeynArts"}| I obtain the error ** TagSetDelayed::tagnf: Tag FourVector not found in -Overscript[mom_, /]^mu/. ** That seems to refer to the first line of .gen model. The error is not clear to me, how could I solve it? Many thanks, Simone P.S. I attached the .gen and .mod files Modmod.txt <https://github.com/user-attachments/files/15957479/Modmod.txt> Modgen.txt <https://github.com/user-attachments/files/15957480/Modgen.txt> — Reply to this email directly, view it on GitHub <#275>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABXSD5F5JS25WVFLOR4EOMLZJAXGRAVCNFSM6AAAAABJZ7ZXHOVHI2DSMVQWIX3LMV43ERDJONRXK43TNFXW4OZWHA2TQNJSGM>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[SimoneTentori]

Dear Vlad,

thank you so much for your answer, this has solved my problem.

Simone