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Unformatted text preview: FREQUENTLY ASKED QUESTIONS October 14, 2011 Content Questions Are there event generators in Geant4? Well, the distinction between an event generator and a detector simula- tion is a bit fuzzy. Geant4 does handle some kinds of things that one might handle in a typical event generator. For instance, it can produce particle decays. Geant4 also contains primary generator code tools that enable you to incorporate easily your own generator code, which could be simple or complicated. Why almost never do we simulate the physical process and we always simulate phase space? We actually do often simulate the physical process. The dynamics of the process may well be amenable to simulation in many cases. For example, when simulating neutrino interactions, we consider nuclear potentials, and final state interactions, as well as the kinematics. The kinematic phase space is often, however, an easy part of the simulation, since distributions are flat in momentum space. Are there processes that cannot be modeled with discrete time steps? In the context of detector simulation, I cant think of any although of course if a process is sufficiently complex or multidimensional, it could be in practice too expensive in terms of computation cycles to allow you to model it with...
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- Fall '11