Triggering in Upgrade S. Blusk 10-28-09 Note: I fixed some bugs I this after the presentation. Introduction. Trigger will use tracking at the earliest phase of the trigger Maybe use CAL as a throttle, but at 2e33, with reduced CAL thresholds, 80% of events trigger… Idea: “Level1”
Try to basically reproduce Victors set of cuts using GaudiPython
Each number in the histogram isthe # surviving events AFTER thegiven requirement above.
Histogram bar from 10-11 is the number of surviving events after the chi2/DOF cut
Note: In LHCb efficiency studies, we measure trigger efficiency with respect tooffline selected events. At this stage of the study, I am only dealing with“tracks”, not “particles”*.
Current trigger gives etot = 0.5% (no HLT2)
So, we get ~2X improvement.
To be more clear though, I will run over “offline selected” events.