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Is the picture below a simulation? How to they draw these pictures? The picture is from here.

enter image description here

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This looks like a combination of known sensor positions (yellow and green), with the orange lines the assumed paths of particles based on sensor readings... I think this is what you are looking for atlas.ch/news/2013/higgs-into-fermions.html –  Luke Burgess Nov 28 '13 at 3:47
    
This kind of image is called an "event display", and as @Luke says it is a visualization of the parts of the detector that were triggered during the event and the reconstructed trajectories (i.e. the output of a significant step in the analysis). –  dmckee Nov 28 '13 at 6:13
    
Related question on the site which might (partially) answer your question: physics.stackexchange.com/questions/11451/… and physics.stackexchange.com/questions/4063/…. I won't have time to write a proper answer any time soon as I have in-laws in town. –  dmckee Nov 28 '13 at 15:30

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