Idea #13832

R006: Two chamber-related problems in roadsets 67 & 70

Added by Kenichi Nakano over 4 years ago. Updated over 4 years ago.

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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?

nktrk_rs70.png (52.5 KB) nktrk_rs70.png kTracks/spill in roadset 70 Kenichi Nakano, 09/10/2016 05:06 PM


#1 Updated by Kenichi Nakano over 4 years ago

  • 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.

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