CalcHEP

Auxiliary Field

Asked by starterism

when i use feynrules to output a calchep model file, it seems like i can't output a Four-Fermion Operator directly.

Then I follow your idea to add a Auxiliary field, but I don't know how to set it to be Auxiliary. now the coefficient of 4-fermion

operator is momentum dependent, so it's not convenient to be used in further research.

 In feynrules' manual, the Auxiliary function is introduced in SUSY part, how can I use it in our case?

PS: I find a website https://feynrules.irmp.ucl.ac.be/wiki/WorkingGroup1

       point three on it seems like useful for me, but I can't find further contents behind it

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Alexander Pukhov
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Best Alexander Pukhov (pukhov) said : 		#1

Particles of your model are described in file prtcls#.mdl
Open this file and fine a particle which was used to generate 4-fermion
vertex.
Put the "*" symbol in "Aux" column, but be careful and don't destroy
column structure marked by "|" separators.

Best
    Alexander Pukhov

On 04/09/2016 01:21 PM, starterism wrote:
> New question #290285 on CalcHEP:
> https://answers.launchpad.net/calchep/+question/290285
>
> when i use feynrules to output a calchep model file, it seems like i can't output a Four-Fermion Operator directly.
>
> Then I follow your idea to add a Auxiliary field, but I don't know how to set it to be Auxiliary. now the coefficient of 4-fermion
>
> operator is momentum dependent, so it's not convenient to be used in further research.
>
> In feynrules' manual, the Auxiliary function is introduced in SUSY part, how can I use it in our case?
>
> PS: I find a website https://feynrules.irmp.ucl.ac.be/wiki/WorkingGroup1
>
> point three on it seems like useful for me, but I can't find further contents behind it
>

Revision history for this message
starterism (phywxh) said : 		#2

brilliant! thanks very much!

Revision history for this message
starterism (phywxh) said : 		#3

Thanks Alexander Pukhov, that solved my question.