Is the macroscopic decay length of particles raken into account when generating events?

Dear experts,

My question is "Is the macroscopic decay length of particles taken into account when MadGraph is computing the cross section?". To be more specific, suppose madgraph is generating events for the process e- e+ > A B, A > e X where X is a BSM particle and A,B are SM particles. Suppose that the coupling of the decay A > e X is very small (based on experimental limits). The decay length of A corresponding to this BSM decay is thus very large. As a result, most of A particles may decay OUTSIDE the detector. Now the question arises: is the cross section that madgraph computes the cross section of events with A decaying INSIDE the detector? or it is just the cross section of all events (some of which with decays inside and some with decays outside the detector.) If the latter is the case, one needs to multiply the madgraph cross section by a factor (regarding the probability that A decays inside the detector) to find the cross section of the desired events.

Thanks in advance for your help.