Performance of the ATLAS Detector on First Single Beam and Cosmic Ray Data

TL;DR

This paper reports on the initial performance assessments of the ATLAS detector using first LHC beam data and cosmic ray events, demonstrating readiness for collision data collection.

Contribution

It provides the first performance evaluation of the ATLAS detector with early beam and cosmic ray data, confirming operational readiness.

Findings

Calorimeter performance meets expectations for jet and missing energy measurements

Detector systems are fully operational and prepared for LHC collision data

Initial data collection confirms detector stability and functionality

Abstract

We report on performance studies of the ATLAS detector obtained with first single LHC (Large Hadron Collider) beam data in September 2008, and large samples of cosmic ray events collected in the fall of 2008. In particular, the performance of the calorimeter, crucial for jet and missing transverse energy measurements, is studied. It is shown that the ATLAS experiment is ready to record the first LHC collisions.