I want to do data analysis and there are some processes called event generation and event reconstruction. I want to know these terms that what does it mean in particle collider? Please guide me.
closed as too broad by sammy gerbil, Emilio Pisanty, AccidentalFourierTransform, Kyle Kanos, rob♦ Aug 10 '18 at 19:24
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In simple term, analysis of particle experiments needs two inputs.
Events from the detectors, i.e. the data have been processed so as to recognize particles and reconstruct a single event; the event is saved in a data bank and has a specific id.
That is event reconstruction. Here you see one reconstructed event .
Event generation implies a monte carlo program, where the quantum mechanical solutions given by the standard model of particle physics are used to throw (generate) an event to build up the probability distribution predicted for such events. This is an ideal event that has to be processed through the detectors again with monte carlo generators giving the probable detection tracks/signals, and gives simulated events at the same level as reconstructed events, so that the distributions can be compare. If the two agree the model is validated, if they disagree a different model has to be proposed ( a discovery made).
The level of reconstruction, i.e. if one stops at tracks and jets and showers, as in the image linked, or use the final four momenta assuming masses for the tracks and assigning jets to hadronic tracks, depends on the type of analysis carried out. One then compares the predicted by monte carlo generation distributions, to the distributions coming from the accumulation of reconstructed events.
Important to note that he word "reconstructed" can also be used for monte carlo generated simulation data, when they go through the process of reconstructing individual four momenta for the simulated event.
Reconstructed events can be a description of the generated events, depending on the context.