eta/pt pdg cuts for only particle not antiparticle

Asked by Samuel Homiller on 2021-01-14

Dear MG5 Team,

I'm attempting to simulate a process where one initial state particle radiates a photon/Z then scatters off in the far forward direction, so that the resulting signal may have e.g., only a final state lepton and not the corresponding anti lepton. For example,

e+ e- > Z e+ e-,

where I require the e+ to have eta > 2.5, but I don't require the same for the e-.

I know I can set `eta_min_pdg` to {11: 2.5} to put the eta_min cut on the e+/e- pair, but it seems that this always applies to both the particle and anti-particle. Is there a straightforward way to make `eta_min_pdg` only apply to one of the particles/antiparticles, so that I can set the cuts for 11 and -11 to be different values?

Thanks, and let me know if there's extra input I can provide to clarify.

Sam

Question information

Language:
English Edit question
Status:
Answered
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MadGraph5_aMC@NLO Edit question
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Last query:
2021-01-14
Last reply:
2021-01-14

Hi,

This can not be done from the run_card, you will need to hack the code to do that.
In this case, the easiest is to hack the file
SubProcesses/setcuts.f and depending of what you want to do for the other cuts.
either set the e+ as not a lepton or just change the logic of the eta cut.

Cheers,

Olivier

> On 14 Jan 2021, at 17:50, Samuel Homiller <email address hidden> wrote:
>
> New question #694992 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/694992
>
> Dear MG5 Team,
>
> I'm attempting to simulate a process where one initial state particle radiates a photon/Z then scatters off in the far forward direction, so that the resulting signal may have e.g., only a final state lepton and not the corresponding anti lepton. For example,
>
> e+ e- > Z e+ e-,
>
> where I require the e+ to have eta > 2.5, but I don't require the same for the e-.
>
> I know I can set `eta_min_pdg` to {11: 2.5} to put the eta_min cut on the e+/e- pair, but it seems that this always applies to both the particle and anti-particle. Is there a straightforward way to make `eta_min_pdg` only apply to one of the particles/antiparticles, so that I can set the cuts for 11 and -11 to be different values?
>
> Thanks, and let me know if there's extra input I can provide to clarify.
>
> Sam
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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