Measurement of the Jet Energy Scale in the CMS experiment ... - IIHE

Chapter 4Reconstructing and SelectingPhysics Event4.1 Monte Carlo Event SimulationIn the absence of experimental data and to model the available physics theories, the toyMonte Carlo data is produced. The first step in the Monte Carlo production chain isgenerating physics “events”, i.e. sets of outgoing particles produced in the interactionsbetween two incoming particles, followed by simulating the detector response based onthe interactions of particles produced in the event with the material of the detector.Hence a very precise modeling of physics and a good understanding of the detectorshould result in simulated events similar to those from real collision.The whole generation chain of an event can be factorized into several stages as illustratedin Figure 4.1.Figure 4.1: Illustration of the event generation chain in proton-proton collisionsadapted from [79].47