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			| event registration [message #14495] | Tue, 12 March 2013 18:15  |  
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					|  Raphael Cervantes Messages: 34
 Registered: September 2012
 Location: Stony Brook University
 | continuous participant | From: *physics.sunysb.edu 
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	| Can someone help me understand how a detector in FairRoot registers an event? I need to understand what criterion a detector uses to registering events, e.g. if a detector registers a particle that just grazes the edge of it, or how much energy is required, etc... 
 I'm am currently looking at the Rutherford example. In line 71 of FairRutherford.cxx, it says " if ( gMC->IsTrackEntering() ) {". Where is the IsTrackEntering() method defined?
 
 I hope my question makes sense. Let me know if I need to clarify anything.
 
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