# How to separate w+ w- > h and z z > h in VBF

Asked by Keping Xie on 2017-12-18

Hi all,
I am Keping. I am investigating the Higgs production through VBF. I have a simple question about how to separate the contributions of w+ w- > h from z z > h in VBF. We know MadGraph can handle the VBF through the following command

generate p p > h j j \$\$ w+ w- z [QCD]

We also know that the command "p p > e+ e- / z" can exclude the particle z in all the diagrams.

Here I want to combine these 2 commands to separate the contribution of w+ w- > h from z z > h in VBF process.

Is there possible way to get this goal?

Best regards,
Keping

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2017-12-18
 Olivier Mattelaer (olivier-mattelaer) said on 2017-12-18: #1

Hi,

Are you sure that what you are asking is gauge invariant? I have some doubt.
Especially for subprocess like u~ d~ > u~ d~ h

Anyway, if you convince yourself that a subset of Feynman diagram can be removed without breaking gauge and lorentz invariance.
The solution is to write a diagram_filtering code.
Basic instructions are given here:

Cheers,

Olivier

On 18 Dec 2017, at 22:52, Keping Xie <<email address hidden><mailto:<email address hidden>>> wrote:

Hi all,
I am Keping. I am investigating the Higgs production through VBF. I have a simple question about how to separate the contributions of w+ w- > h from z z > h in VBF. We know MadGraph can handle the VBF through the following command

generate p p > h j j \$\$ w+ w- z [QCD]

We also know that the command "p p > e+ e- / z" can exclude the particle z in all the diagrams.

Here I want to combine these 2 commands to separate the contribution of w+ w- > h from z z > h in VBF process.

Is there possible way to get this goal?

Best regards,
Keping

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