R006: kTrack rate in the periods of "resolved" signal-timing shift
The (large) signal-timing shift happened twice in roadset 59 and once in roadset 70, as recorded in
It has been (mostly) resolved by shifting the measured drift time in kTracker.
I checked the number of reconstructed kTracks to judge if these data are fine for physics analysis.
I applied a R005-like selection as follows to count only good target kTracks;
select spillID, count(*) from kTrack where roadID != 0 and z0 between -200 and -50 and chisq/(numHits-5) < 5 and numHits >= 15 and (numHits = 18 or pz1 > 18) group by spillID
Two plots attached show the kTrack rate in roadsets 59 and 70. The periods of signal-timing shifts are drawn. The kTrack rate is lower by a few percent (by eye) than the normal period. Is it high enough and fine for physics analysis?
#1 Updated by Kenichi Nakano about 3 years ago
- Tracker changed from Bug to Feature
- Status changed from New to Closed
This was discussed at the analysis meeting on Sep. 13. No one claimed any problem on this kTrack rate. Just we should check it again once the track/dimuon selection is updated/fixed for R006.