Hello Norway A very nice note. A few comments : 1) I don't understand what you say on page 1. You substitute the geant hit with ... 2) What is the efficiency vs the number of initial tracks ? 3) Do you check to see if you find the track alone with the tracking code. The reason for not reconstructing some of the geant tracks is that some of them are quite curved. Print out the chi**2 and compare to when you find the track. In general the Chi**2 output from at least the BrTrackFollowFinder looks bad( I included this as a new histo in BrClusterFinderBase) and is of course quite interesting for the quality of tracks we find. Does it look consistently bad for the StringFinder ? This is of course related to what we assume the white noise to be ( currently 2 adc channels ). 4) Are the 2 trackers allowed to miss the same number of planes, ghost hits share the same number of hits etc. ? What trigger do you use - I would start with trigger 6 where we know that there are much less banana tracks. Cuts on vertex ? 5) I think the problem with anti-ghost hits is related to the break down of the tracking code at least for -2 and down. Now I propogate the status to the Entry function and store it in a histo ( 0 = ok, 1 = failed ), but maybe you want to make the status an accessible parameter. At least I think the crashes should be seperated for both trackers, so we only get the relative tracking efficiency and then seperately the crash efficiency;) 6) I don't understand why the distribution in figure 1 has such a long tail for the TrackStringFinder. 7) I think that instead of using to much time on going down to the TPCSequence level it would be interesting to focus on why we don't find the tracks. This is of course a damn hard task, but maybe there is a simple subset of events that could be viewed on a monitor that would shead some light on this. One could also carefully keep track of the tracks before and after and compare them, compare tracks from the 2 methods and compare tracks in a single ouput to see how the general overlap distribution looks. I will try to look at the trackfollowfinder in the coming week. Cheers, Peter :-) --------------------------------- )-: |Peter H L Christiansen aka PAN @ NBI | |EMAIL : pchristi@nbi.dk | |OFFICE : Tb1 @ NBI | |PHONE : 353 25269 <- New!! | |SNAIL : Sdr. Fasanvej 14 ST 2000 F | |PHONE : 38 872042 | :-D --------------------------------- \-:
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