Track reconstruction contamination study

 
 

 Geant production vertices for all particles leaving more than five geant hits in the FTPC, fromm 70 Hijing events.

All primary vertices are at |z|<40cm. The SVT structures end at 50cm, the beampipe support is at 55cm, the Be-Al flange in the beampipe is at 76cm, and the FTPC begins at 150cm, with the fieldcage around 155cm.


 

Geant vertex position of those tracks that do not start at the main vertex but are improperly reconstructed as main vertex tracks in the FTPC.

Same as above, but showing only electron and positron tracks, thus eliminating the inevitable feeddown from strange particle decays. The peak is at the position of the beampipe support.


Janet Seyboth

<-- Created: Mon Dec 13 23:17:58 CET 1999 by Holm Huemmler -->Last modified: Wed July 6 10:05:19 CET 2005