This study is currently focused on the IST hits only

• number of TPC hits is greater than 30
• the track is required to cross an IST active layer

1. Closest vs accepted Sti hits

   

2. All track nodes (ALL). "Significance" from the mean track projection to the closest hit for IST. The axis values are in "sigma" units
   

   
   The following shows the hit candidates which are constrained to come from the same active layer as the track node (i.e. mean track projection)
   

3. Track nodes with a hit assigned by Sti (ACCEPTED). "Significance" from the mean track projection to the closest (ACCEPTED) hit for IST. The axis values are in "sigma" units

   
   The following shows the hit candidates which are constrained to come from the same active layer as the track node (i.e. mean track projection)
   

4. Track nodes with NO hit assigned by Sti (REJECTED). "Significance" from the mean track projection to the closest (REJECTED) hit for IST. The axis values are in "sigma" units

   
   The following shows the hit candidates which are constrained to come from the same active layer as the track node (i.e. mean track projection)
   

5. Hit "efficiency" and support plots. The axis values are in centimeters. The first row shows track nodes from the "ALL" category, the second row includes track nodes from the "ACCEPTED" category, i.e. there is a hit assigned by Sti to the track node, the third row shows the ratio of the first two, i.e. the "efficiency"
   

   
   
   

6. "Significance" from the mean track projection to the ALL hits in 5-sigma window for IST. The statistics is lower because an additional requirement on hits has been placed: The hits are required to belong to the same active Sti volume. The axis values are in "sigma" units