1. Visualization of Tracking Issues in CRUZET4 Data
Track Reconstruction
September 18th, 2008
Ryan Kelley (UCSD)

2. Introduction
Short presentation to show some event displays from a CRUZET4 run before and after reprocessing.
Run super pointing skim
Reprocessed in CMSSW_2_1_8
Looked at 4 cases:
CASE 1: CTF tracks, bug fix
Self layer navigation
No TIB hits attached after reprocessing
CASE 2: no CTF tracks but RS/CosmicTF tracks
has a short CTF track after reproc but RS/CosmicTF has longer track
CASE 3: no tracks at all (before or after reprocessing)
CASE 4: an example with many CTF tracks

3. Case 1a: CTF self Navigation Run 58555, Event 250318
Before
After
CTF was cutting off half way through due to self layer navigation bug. Appears to be corrected in this event.

4. Case 1a: CTF self Navigation Run 58555, Event 2875021
Before
After
Same

5. Case 1a: No CTF Before Run 58555, Event 3002960
CTF looks longer but non of the TIB hits are attached to the track (13 TOB hits, 0 TIB hits).

6. Case 1b: No CTF Before Run 58555, Event 1924567
RZ view displays rechits in the center of the strip
Before reprocessing, there was no CTF track (but does have RS and CosmicTF).

7. Case 1b: No CTF Before (cont.) Run 58555, Event 1924567
After reprocessing, we have tracks from all three algorithms. 13/73 events recovered a CTF after reprocessing

8. Case 1b: No CTF Before Run 58555, Event 3856449
After
Another example

9. Case 2: no CTF but RS/CosmicTF Run 58555, Event 5082122
CTF seems to miss tracks that pass through transition region between TEC and TOB.

10. Case 2: no CTF but RS/CosmicTF Run 58555, Event 251861
CTF seems to miss tracks that pass through transition region between TEC and TOB.

11. Case 2a: no CTF but RS/CosmicTF Run 58555, Event 2877330
No CTF originally. After reprocessing, had a short track.
RS/CosmicTF have a long track.

12. Case 3: no Tracks (any algo) Run 58555, Event 1876771
A few muon hits but no coherent hits in the tracker

13. Case 3: no Tracks (any algo) Run 58555, Event 966098
Same

14. Case 3: no Tracks (any algo) Run 58555, Event 1924567
Same as before

15. Case 3: no Tracks (any algo) Run 58555, Event 2999883
Went straight down the TEC

16. Case 3: no Tracks (any algo) Run 58555, Event 5078284
Another example crossing the TEC

17. Case 4: many CTF tracks Run 58555, Event 3003207
Before
After
Both had 7 CTF tracks. After has this weird track.

18. Case 4: many CTF tracks Run 58555, Event 5076389
Before
After
3 CTF tracks before, 5 after. More weird tracks.

19. Conclusions
Only looked at a few events so take these conclusions with a grain of salt.
Self layer navigation appears to be working
Found one case where tracks are not attaching the TIB hits
No CTF and w/RS and CosmicTF
events where the muon skirts the transition region between Barrel/Endcap
No tracks (any algo)
Events with no coherent hits in the tracker
Events that pass through only endcap
Showed two event with many hits
CTF made some weird short tracks.