Abstract
The performance of the CMS Level-1 Trigger for supersymmetric events at an LHC luminosity of 2 x 1033 cm-2s-1 is reviewed. Energy and momentum trigger thresholds have been chosen to yield a maximum Level-1 output rate of 50 kHz, within a safety factor of three. The Level-1 trigger efficiencies for the majority of the channels studied are found to be greater than 90%, which provides a good basis for the High-Level Trigger, where more stringent conditions are applied. Reasons for occasional lower efficiencies are given.
Highlights
The Large Hadron Collider (LHC), foreseen to begin operation in 2007, is presently under construction at CERN, the European Organization for Particle Physics in Geneva
The goal of this study was to determine Level-1 trigger efficiencies for selected SUSY events recorded during the initial low luminosity running period of the LHC
Good L1 efficiencies are a prerequisite to good overall efficiencies, which are a convolution of both Level-1 and High Level Trigger (HLT) efficiencies
Summary
The Large Hadron Collider (LHC), foreseen to begin operation in 2007, is presently under construction at CERN, the European Organization for Particle Physics in Geneva. Since it is impossible to store and process the large amount of data associated with the resulting high number of events, a drastic rate reduction has to be achieved This task is performed by the trigger system, which is the start of the physics event selection process
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