CSC Note Calo-6: L1 Calorimeter Trigger Simulation

Main Editors: Alan Watson, Fabienne Ledroit

Abstract

This note describes the functionality, configuration and performance of the Level 1 calorimeter trigger simulation, including the simulation of the analogue signals received from the calorimeters as well as the trigger processing. Calibration & tuning of the analogue signals, digitised towers and trigger algorithm parameters are described. The overall structure of the simulation is discussed, but not the detailed implementation. The main configuration options are described, and remaining differences from the hardware implementation, and their significance, indicated.

The performance of the different trigger elements (EM, Tau, Jet, ETmiss, Total ET and Jet ET sum) is described. The efficiencies of individual triggers are studied both for single particles (where appropriate) and for some example physics processes, and the dependence of the performance on thresholds and other configuration parameters is discussed. The performance of multi-object and combined triggers is also considered. Overall calorimeter trigger efficiencies and rates are illustrated for an example trigger menu and a few physics signatures, but for trigger performance in particular processes the reader should refer to the process-specific notes.

Structure of Note

• LAr L1 tower sum simulation
  • Requirements & Implementation
  • Structure of simulation
  • Calibration
  • Configuration Options
• Tile L1 tower sum simulation
  • Requirements & Implementation
  • Structure of simulation
  • Calibration
  • Configuration Options
• Level 1 calorimeter trigger processor simulation
  • Data Preprocessing
  • Trigger Algorithms
  • Calibration for Jet/ETmiss response
  • Structure of software packages
  • Trigger Configuration
• EDM of Level 1 calorimeter trigger
  • RDO
  • Bytestream
  • ESD and AOD
• Performance of simulation
  • e/gamma trigger
  • Tau/hadron trigger
  • Jet trigger (including forward jets)
  • Missing ET trigger
  • ETsum and Jet ET sum triggers
  • Combined trigger performance

-- Main.watsona - 28 Jul 2006