davinci:samples
Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| davinci:samples [2009/03/07 11:00] – decianm | davinci:samples [2009/07/02 14:45] (current) – decianm | ||
|---|---|---|---|
| Line 76: | Line 76: | ||
| PIDs are checked in some order and all tracks that are compatible with being a muon are made a muon, then an electron, proton, kaon and pion. What you get will depends on this order, which is already a good enough reason not to want that. If you do B->pipi and one pi decays to a muon, it will never be a pi candidate. Even worse, if you or someone relaxes the mu ID cuts between two jobs or two DaVinci versions, then suddenly what used to be a nice pion in one version of DV might now becomes a muon candidate. Your efficiency decreases although nothing affecting pion or kaon ID changed. That makes it very hard to estimate signal efficiencies as all efficiencies depend on everything. If you want to cut hard on PID, use PID cuts. If you don't want to use the same track several times (which is a valid point for tagging), then use the Overlap Tool and re-weight the track accordingly if needed. | PIDs are checked in some order and all tracks that are compatible with being a muon are made a muon, then an electron, proton, kaon and pion. What you get will depends on this order, which is already a good enough reason not to want that. If you do B->pipi and one pi decays to a muon, it will never be a pi candidate. Even worse, if you or someone relaxes the mu ID cuts between two jobs or two DaVinci versions, then suddenly what used to be a nice pion in one version of DV might now becomes a muon candidate. Your efficiency decreases although nothing affecting pion or kaon ID changed. That makes it very hard to estimate signal efficiencies as all efficiencies depend on everything. If you want to cut hard on PID, use PID cuts. If you don't want to use the same track several times (which is a valid point for tagging), then use the Overlap Tool and re-weight the track accordingly if needed. | ||
| + | |||
| + | ===== MC09 ===== | ||
| + | The corresponding information for MC09 samples can be found in: **$COMMONPARTICLESROOT/ | ||
| + | |||
davinci/samples.1236420048.txt.gz · Last modified: 2009/03/07 11:00 by decianm
Page Tools
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Noncommercial-Share Alike 4.0 International
