MadGraph5_aMC@NLO

matching and merging at the muon collider

Asked by Arvind

Dear Sir,

I am generating the SM background processes in Madgraph for a muon collider. I am running the following processes.

1) generate mu- mu+ > z, z > mu- mu+
     add process mu- mu+ > z j j, z > mu- mu+

2) 1) generate mu- mu+ > w j j, w > mux vmx
where , mux = mu- mu+ and vmx = vm vm~.

is there any documentation on what values of qcut and xqcut are to be taken for proper matching and merging or
do we just obtain thee DJR plots and take values which give us a smooth plot. Also, can one use pythia to obtain DJR or one has
to use madanalysis for that.

Thank you

Arvind Bhaskar

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

Hi,

As far as I know, the MLM/CKKW(L)/... algorithm were only implemented for QCD radiation.
I guess that the same algorithms could be implemented for QED and/or EW radiation (but likely would need some dedicated tuning --especially for the EW case--). But I do not know any team working in that direction for the moment.

At minima, your syntax would not make that much sense since they are no reason to single out QCD particles for such QED/EW case.

So in this case, if you want to do something like MLM, you would need to implement the radiation veto yourself (and check carefully the status of electroweak shower).
And for the syntax in madgraph, you will likely need something like this (assuming pure QED case)
define light = all / g h w+ w- z
generate mu- mu+ > z, z > mu- mu+
add process mu- mu+ > z light , z > mu- mu+
add process mu- mu+ > z light light , z > mu- mu+

For the plotting, the best here is likely to do all the plot by hand, since I would not trust any tool to do the correct plot in this particular case.

Cheers,

Olivier

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Arvind (flash123) said : 		#2

Dear Sir,

Thank you for the response.

Cheers,
Arvind

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Arvind (flash123) said : 		#3

Thanks Olivier Mattelaer, that solved my question.