Factorization of cross section and luminosity

Asked by Guglielmo Coloretti

Dear all,

Good morning. I am using a two-higgs-doublet-model (2HDM) to generate at resonance the production of the additional higgs (referred as H) via gluon-gluon fusion and then compute the decays of the H.

generate g g > H, (H > all all)

The coupling among H and top quark determines the value of the cross section for the production of H via gluon-gluon fusion. I want to adjust it depending on the output signal from experiments.

Therefore, I would like to just generate the decays of H and then multiply the final result by the total cross section for the production of H via gluon-gluon fusion.

My first question is the following: when I am computing a decay using the standard paramcard, what is MadGraph understanding for the production mechanism? Or, if I just consider the decays of H, the energy used should be just the rest mass of H and not the one listed in the paramcard. Is my understanding correct?

Also, regarding the number of events obtained, they depend on the luminosity of the accelerator. Is MadGraph using some specific value for the luminosity? Or can I just multiply my final output by the luminosity stated in the experimental paper used as comparison for the signal?

I thank you very much for your help!!

Best regards,
Guglielmo Coloretti

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