MadGraph5_aMC@NLO

how to avoid some of the effective couplings and also how to avoid production of 4 leptons from one Z boson in higgs to 4 lepton channel

Asked by krunal

Hello, I am trying to study the Higgs to 4 lepton decay channel through ggf using BSMC model as a part of my study in Higgs EFT. I am using the command:
generate p p > h > e+ e- mu+ mu- / a QNP=1
But this leads to the generation of 4 leptons even through one Z boson which I want to avoid. So which command should I use more? So also, how can I restrict the effective coupling to lie only between higgs and gluons as the Feynman diagrams generated have effective couplings between higgs and Z bosons as well as between the Z boson and a pair of leptons?
Thanking you in advance!

Question information

Language:
English Edit question
Status:
Answered
For:
MadGraph5_aMC@NLO Edit question
Assignee:
Kentarou Mawatari Edit question
Last query:
Last reply:
Revision history for this message
Kentarou Mawatari (kentarou-mawatari) said : 		#1

Hi Krunal,

An effective vertex corresponds to one (or a few) operator, so that you can control by changing the Wilson coefficient(s) in param card.

Kentarou

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#2

Hi,

Just to add up on what Kentarou tell you,
If you want to fully remove Feynman diagram who have zero coupling when playing with the Wilson coefficient,
You can use the restricted model technique:
https://answers.launchpad.net/mg5amcnlo/+faq/2312

Cheers,

Olivier
> On 9 May 2017, at 08:53, Kentarou Mawatari <email address hidden> wrote:
>
> Question #631713 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/631713
>
> Status: Open => Answered
>
> Kentarou Mawatari proposed the following answer:
> Hi Krunal,
>
> An effective vertex corresponds to one (or a few) operator, so that you
> can control by changing the Wilson coefficient(s) in param card.
>
> Kentarou
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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