Mohamad-Ziad Charif - Antares

give the distribution of arrival time as a function of the direction, and orientationof photons when they hit the PMT at different positions. In addition to the simulationof visible light, KM3 deals as well with the propagation of muons in themedium and the related physical process.4.2.4 Trigger and optical background simulationAfter the propagation of photon from each event has been simulated, the nextstep is to simulate two things at the same time. First there is a need to simulatethe optical background coming from two sources, bioluminescences and K 40 . Thesecond part is essentially a simulation of how the detector will respond to an event,this is essentially a simulation of the electronics such as the PMTs, and the ARSmotherboards. This is all done with a software package called TriggerEfficiency.ReconstructionAfter the simulations have been treated with TriggerEfficiency the Monte Carlooutput has the same format as data, so they can be treated as such and have theevents reconstructed. And as previously mentioned the two important strategiesare AAFit and BBFit, which we will use to reconstruct the events.75