BAT SUSY 2011 - Triggers

2011 Triggers

Goal is to study the 2011 lepton triggers and their effect on our cut flow. Efficiencies versus eta, pt, phi.

To do:

• Previous studies ?
Reproduce 2010 results with data and some MC signal. 2010 main data trigger: e15_medium
• Start with electrons, tools from egamma
Electron triggers changing trigger cut thresholds can be reproduced from D3PDs using the egamma trigger tools: https://twiki.cern.ch/twiki/bin/viewauth/Atlas/TrigHypoCutTools
• Study offline to electron trigger object matching

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• Trigger notation
L1 -> 1st level trigger (hardware) L2 -> 2nd level trigger (software, part of High Level Trigger (HLT) together with EF EF -> Event Filter, 3rd level trigger (software, part of HLT, code as similar to offline at possible) Ex.: e20_medium e -> electron 20 -> minimum Et trigger threshold required at EF (EF= Event Filter, 3rd trigger level) medium -> EF cuts are the same than for offline electron IsEM medium identification. As a rule of thumb plateau is reached ~5GeV above the trigger cut.

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Information on 2011 electron unprescaled triggers

• e20_medium:
Medium definition has changed with respect to 2011, 30% higher rejection. Trigger selection will be tightened with increasing luminosity (for sure after peak luminosity goes above ~1e33) the so-called: e20_medium1 or e20_medium_tight, the specific thresholds to be used in this trigger are not yet defined, we could provide input on the prefered/disliked cut tightening.
• 2e12_medium
It should be kept unprescaled through whole 2011 data taking
• ....

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USEFUL LINKS

https://twiki.cern.ch/twiki/bin/view/Atlas/TrigEgamma

https://twiki.cern.ch/twiki/bin/viewauth/Atlas/TrigHypoCutTools