For an event to be in the trigger DST requires that it have both a trigger and a reconstructed BMU-CdfMuon. The front trigger requires that the XFT cough up a 3.1 GeV Pt muon headed for the stub. I don't know the details of the algorithm, but I suspect that the shape of the parallelograms in the trigger data distribution is due to the geometry implicit in the XFT algorithm.
The rear trigger does not require an XFT track, but to get into the DST we have to have an offline track, so I suspect that the notch cut out of the blob on each side is due to the restrictions on the tracking (which doesn't allow SVX-only). The slope of the notch is about 3.
Another thing to notice about the rear trigger plots is the rather wide spread of projected z's. There is not a clean cutoff at the front of the BSU as there is in the front trigger. Bob has told me that this doesn't get any better for high Pt muons. This suggests that the eta measured for tracks with larger eta has a good deal more error than advertised.
The statistics for the volunteers (right-hand plots) are unfortunately rather low. I can't say much about the front trigger hits, except that they are consistent with being where we expect them. The projected Z positions for front triggers (upper) and rear triggers (lower) show that the volunteers are slightly more likely to be in the forward than the rear for a rear trigger.
Modified 5-Mar-2003 at 10:41
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