Operation of the ATLAS detector with first collisions at 7 TeV at the LHC

TL;DR

This paper reports on the successful operation of the ATLAS detector during initial 7 TeV proton-proton collisions at the LHC, detailing the infrastructure and procedures enabling data collection and analysis.

Contribution

It presents the first operational experience and technical setup of the ATLAS detector with 7 TeV collisions, including data acquisition and calibration methods.

Findings

Recorded over 300 nb^-1 of data at 7 TeV

Achieved 94% efficiency in data collection

Established infrastructure for data processing and luminosity measurement

Abstract

The ATLAS experiment has successfully recorded over 300 nb^-1 of pp collisions at 7 TeV provided by the Large Hadron Collider, with an efficiency of 94%. We describe the data acquisition, trigger, reconstruction, calibration, monitoring, and luminosity measurement infrastructure that have made this possible.