The Trigger System of the CMS Experiment

TL;DR

This paper describes the CMS experiment's trigger system, including its design, configurations, and performance expectations, crucial for managing data collection during LHC operations.

Contribution

It provides a comprehensive overview of the CMS trigger system's features, configurations, and performance considerations at LHC start-up and future luminosity increases.

Findings

Trigger configurations for calibration and physics analysis

Expected CPU performance of trigger algorithms

CPU requirements for event filtering at start-up

Abstract

We give an overview of the main features of the CMS trigger and data acquisition (DAQ) system. Then, we illustrate the strategies and trigger configurations (trigger tables) developed for the detector calibration and physics program of the CMS experiment, at start-up of LHC operations, as well as their possible evolution with increasing luminosity. Finally, we discuss the expected CPU time performance of the trigger algorithms and the CPU requirements for the event filter farm at start-up.