Name: Vladyslav Shtabovenko (email_not_shown)
Date: 04/07/16-09:50:52 PM Z


Hi Xing-Bo,

thanks for the detailed example. Your idea to provide a function to
patch the model is actually very good. I need to improve the
corresponding code to make it a bit more user friendly and universal,
but this shouldn't take too much time.

Cheers,
Vladyslav

Am 05.04.2016 um 20:36 schrieb Xing-Bo Yuan:
> Hi Vladyslav,
>
> I am sorry for so late reply.
>
> “Correct. In fact, I haven't thought of the possibility that someone
> would use FCFAConvert[] for unpatched FeynArts. However, this shouldn't
> be difficult to fix.
>
> I don't use FeynRules, so it would be nice if you could send me some
> examples of code to which you are applying FCFAConvert. This way I could
> it test it a bit, before pushing the changes in the repo. “
>
> Thank you for the explanation.
>
> I have seen many people use FeynCalc to perform calculation on BSM models. An usual roadmap is FeynRules->FeynArts->FeynCalc, i.e. using FeynRules to generate FeynArts model file, then generate amplitude in FeynArts, finally the analytical calculation is performed in FeynCalc.
>
> Now, the situation is that, the unpatched FeynArts can directly read the model file generated by FeynRules, but the patched FeynArts, which is installed with FeynCalc, can not.
>
> Your suggestion is to generate amplitude in unpatched FeynArts, then load it in FeynCalc. It’s also what I currently used. In this approach, one need change some functions by hand. Please find the files in the following link.
> https://www.dropbox.com/s/qwlhxruzqgzvcbo/Archive.zip?dl=0
> I give few sample examples which you asked for. Hope you can update FCFAConvert[] to apply for the amplitude generated by unpatched FeynArts.
>
> In addition, I have another suggestion to solve the current problem. In FeynCalc, if there is a function to patch the model file generated by FeynRules, then people can easily use the patched FeynArts. In fact, I think there already exists such a function. Because, when installing FeynCalc and patching FeynArts, the model files in ./FeynCalc/FeynArts/Models/ are automatically patched.
>
> Thank you again for your time.
>
> Best Regards,
> Xing-Bo Yuan
>



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