Ho everyone. Exams safely over, I've started looking at some data again.
This may be common knowledge, bit since I at least didn't know I'll bring
it up:
There appears to be a bad calibration of some sorts for runs 5903-5925
(at least) - at least the MRS global/matching code gives screwy results
there. You can see the effect e.g. in Peters reduced data files here:
/direct/brahms+data11/data/pchristi/dst
Have a look e.g. at the file hist5915.root, the histogram
TOFWPid/No_Cuts/hMass2vP
or indeed any of the files for runs 5903-5925. The data looks OK for runs
5901 and below, and for 5931 and above.
If you look at the histograms from the global tracking step for the same
runs, you can see that the BB code also gives weird results - the
histogram BbVertex/AcceptecVtx is empty, which is not the case for the
other runs. I therefore suspect a bad BB calib, and there is indeed a BB
calib starting at run 5903. Howerver, as far as I can see from the
calib-viewer webpage, this revision lasts until run 5940, and so run 5937
in Peters dir. should have been bad as well.
Anyone? Maybe this has been solved and I just haven't seen it in the
middle of my exams...
Ping :-)
--
Bjorn H. Samset Phone: 22856465/92051998
PhD student, heavy ion physics Adr: Schouterrassen 6
Inst. of Physics, University of Oslo 0573 Oslo
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