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Feedback Re: TrackID & Parent ID 

Forum: Event and Track Management
Re: Question TrackID & Parent ID (safoora)
Date: 26 Jul, 2013
From: Gumplinger Peter <Gumplinger Peter>

> what does Track ID = 12, Parent ID = 1 mean? or Track ID = 12, Parent ID = 2

Tracks are simulated in Geant4 from a heap - last in/next out. As a track propagates, it may generate more secondaries which all go on the heap until the track stops. Every new entry on the heap gets an increasing and unique track number. The parent ID is the track number of the parent particle. So, in one event Track ID = 12 has Parent ID = 1, but in the next event where track #1 produced less secondaries, it is a 'child' of track #2 that happens to get Track ID = 12.

> ......and please tell me what are important Track ID & ParentID ?

Their absolute numbers are not important. What is useful information is to know who is a 'child' of whom in a given event. Sometimes it's useful to know who is a primary (has ParentID == 0) or who is a direct descendant of a primary.

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