Detailed detector simulation and reconstruction of physics objects at the LHCare very CPU intensive and hence time consuming due to the high energy andmultiplicity of the Monte-Carlo events and the complexity of the detectors. Wepresent a dynamically configurable system for fast Monte-Carlo simulation andreconstruction (FAMOS) that has been developed for CMS to allow fast studies oflarge samples of Monte-Carlo events. Each single step of the chain -simulation, digitization and reconstruction, as well as combinations of chainlinks can be replaced by modules that sacrifice precision for speed. Fast anddetailed modules have identical interfaces so that a change is fullytransparent for the user. Currently, a complete set of the fastest possible implementation, i.e. goingdirectly from the Monte-Carlo truth to reconstructed objects, has beenimplemented. It is about hundred to thousand times faster than the fullydetailed simulation/reconstruction and provides tracks reconstructed by theinner tracker, clusters in calorimeters and trigger-Lvl1 objects and tracksreconstructed for the muon system of the CMS detector.
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