MadGraph5_aMC@NLO

Simulating muon anti-muon collisions

Asked by HH

Dear Olivier,

I need to simulate muon anti-muon collisions assuming a future muon collider. How can I do it in MG? We know that the muon has a lifetime of O(10^-6) and therefore a fraction of muons may decay in the beam pipe before collision takes place. How can we take this effect into account? Is there any other effect which must be considered in muon anti-muon simulation?

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Olivier Mattelaer
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Best Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

> We know that the muon has a lifetime of O(10^-6) and therefore a fraction of muons may decay in the beam pipe before collision takes place. How can we take this effect into account?

MadGraph only support fix beam energy for the muon / anti-muon.
The effect that you refer to has a first effect to reduce the luminosity (which is independent of the cross-section).
Other effect are possible and should typically be handle via PDF type of function at the same level as beamstrahlunng and initial state radiation (ISR) for the lepton. ISR is currently available via a PLUGIN.

Cheers,

Olivier

> On 11 Jul 2020, at 12:25, HH <email address hidden> wrote:
>
> New question #691806 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/691806
>
> Dear Olivier,
>
> I need to simulate muon anti-muon collisions assuming a future muon collider. How can I do it in MG? We know that the muon has a lifetime of O(10^-6) and therefore a fraction of muons may decay in the beam pipe before collision takes place. How can we take this effect into account? Is there any other effect which must be considered in muon anti-muon simulation?
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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HH (hh-madgrapher) said : 		#2

Thanks Olivier Mattelaer, that solved my question.