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Z ee trigger & e/ framework

Z ee trigger & e/ framework. Validation of the framework First look at a trigger menu combining several signatures. Framework validation – Mark . Compared new framework with old version from Monika Tested 1000 single electron Rome events 5 events selected by old framework and not by new

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Z ee trigger & e/ framework

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  1. Zee trigger & e/ framework Validation of the framework First look at a trigger menu combining several signatures

  2. Framework validation – Mark • Compared new framework with old version from Monika • Tested 1000 single electron Rome events • 5 events selected by old framework and not by new • Problem traced down to different cuts in EF sequence • 100% agreement after that • Another difference found: • New framework “reconstructs” tracks only within geometrical RoIs (using track perigee parameters) • Is this the right thing to do?

  3. Zee - Ricardo • As part of framework validation: • Combined e25i, 2e15i and e60 in the new framework • All cuts from Monika’s Wiki page except for EF track isolation in EFID sequence • Found L2 delta eta and phi cuts should be swapped • No tracking cuts at level 2 for 2e15i or e60, following recipe in wiki • 4468 Zee events from an old production, no pileup • 234634 “di-jet” events with pileup from sample 4814 (ET>17GeV)

  4. A few plots Z->ee Jets LVL1 LVL2

  5. L2ID e25i: Z->ee Jets

  6. LVL2: e60 jets LVL2: e60 Z->ee EF: e25i jets EF: e25i Z->ee

  7. Performance & comparison with old • These numbers disagree with those obtained with old framework (verification ongoing) • Likely that the difference is explained by preselection cuts that Monika applies (2 electrons within |eta|<2.5 with pT>XXX) • Tests with a few (200) single electrons still don’t show better than ~10% agreement (but see previous point) • Absolute efficiencies shown in table

  8. Interesting to note correlations between different signatures: much larger in signal than in background (makes sense) Overlaps: Z->ee: 4468 events Jets: 234634 events

  9. Conclusions: • Agreement between old and new frameworks to ~10% or worse for these events • But found out in the meantime that should be applying preselection cuts • Much better agreement was found comparing single electrons using Monika’s version of the old framework 100% agreement • Looked at overlap between signatures in menu with three signatures: much to do here! • Validation work ongoing: look at jet events!

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