MadGraph5_aMC@NLO

how to introduce a new particle as a source of missing energy

Asked by Saurabh Niyogi

In the Standard cuts section of run_card the missing energy is calculated as sum of neutrinos momenta. If a new model has a new particle as dark matter which can be new source of missing energy. How can we add a new particle in MG5 whose contribution might be considered in MET calculation ?

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Saurabh Niyogi
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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

We do not have any official way to do that and you need to hack the code to do that (i.e. you break the "warranty" (even if none are provided by the code))

Two options for applying cuts at parton-level:
1) edit setcuts.f and add your pdgcode to the same group of particles as neutrino
2) edit the file SubProcesses/dummy_fcts.f where you can add any cut that you want.

Note that analysis tool like MadAnalysis5 and detector-simulation package are typically able to identify your particles as missing energy for the plot/... if you use one of the standard pdg code for dark matter candidate.

Cheers,

Olivier

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Saurabh Niyogi (saurabh12102003) said : 		#2

Thanks a lot, Olivier.