Performance of the CMS Drift-Tube Local Trigger with Cosmic Rays

TL;DR

This paper evaluates the CMS drift-tube local trigger's performance using cosmic ray muons, comparing real data with simulations and design expectations to understand its effectiveness during detector commissioning.

Contribution

It provides a detailed analysis of the trigger system's performance with cosmic rays, including the impact of random arrival times, and compares results with simulations and previous measurements.

Findings

Trigger performance aligns with design expectations for proton-proton collisions.

Random cosmic ray arrival times affect trigger efficiency and timing.

Results validate the trigger system's readiness for collision data.

Abstract

The performance of the Local Trigger based on the drift-tube system of the CMS experiment has been studied using muons from cosmic ray events collected during the commissioning of the detector in 2008. The properties of the system are extensively tested and compared with the simulation. The effect of the random arrival time of the cosmic rays on the trigger performance is reported, and the results are compared with the design expectations for proton-proton collisions and with previous measurements obtained with muon beams.