R006: Two chamber-related problems in roadsets 67 & 70
Two chamber-related problems, namely
* The D1 gas flow was lower and
* The D3p TDC time window was shifted,
were known and listed in
The spills affected by them were discarded for the dbar/ubar preliminary result, because most of them were affected also by the signal-timing shift. As the signal-timing shift has been resolved in R006, we should discuss and decide how we handle the chamber-related problems.
I checked the number of reconstructed kTracks to estimate the effect of the problems.
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
The plot attached shows the kTrack rate vs spill. The periods of the two problems (and also of the signal-timing shift) are drawn. The kTrack rate is as high as in the normal period. Is it usable for physics analysis?