Dear Experts,
I am interested in knowing the normalization of TGenPhaseSpace in ROOT. In other words, if I were to simply integrate over phase space (i.e. assuming matrix element squared = 1), what would be the answer? I ask because factors of (2*pi) need to be absorbed accordingly in the amplitude.
best,
Suchita.
Hi,
TGenPhaseSpace generates the particle momentum for every event taking correctly into account the phase space. It is assumed a matrix element squared=1 and it returns an event weight , where you can apply the matrix element. The correct normalisation is taken care when generating the event.
You can find more information the technique used in this old reference,
Cheers
Lorenzo
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