Readiness of the ATLAS Liquid Argon Calorimeter for LHC Collisions

Abstract

The ATLAS liquid argon calorimeter has been operating continuously since August 2006. At this time, only part of the calorimeter was readout, but since the beginning of 2008, all calorimeter cells have been connected to the ATLAS readout system in preparation for LHC collisions. This paper gives an overview of the liquid argon calorimeter performance measured in situ with random triggers, calibration data, cosmic muons, and LHC beam splash events. Results on the detector operation, timing performance, electronics noise, and gain stability are presented. High energy deposits from radiative cosmic muons and beam splash events allow to check the intrinsic constant term of the energy resolution. The uniformity of the electromagnetic barrel calorimeter response along eta (averaged over phi) is measured at the percent level using minimum ionizing cosmic muons. Finally, studies of electromagnetic showers from radiative muons have been used to cross-check the Monte Carlo simulation. The performance results obtained using the ATLAS readout, data acquisition, and reconstruction software indicate that the liquid argon calorimeter is well-prepared for collisions at the dawn of the LHC era.

31 pages, 34 figures, accepted for publication in EPJC

References in corpus (5)

• Energy Linearity and Resolution of the ATLAS Electromagnetic Barrel Calorimeter in an Electron Test-Beam
• Hadronic Calibration of the ATLAS Liquid Argon End-Cap Calorimeter in the Pseudorapidity Region 1.6 < |eta| < 1.8 in Beam Tests
• Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons
• Response Uniformity of the ATLAS Liquid Argon Electromagnetic Calorimeter
• Position resolution and particle identification with the ATLAS EM calorimeter

Cited by in corpus (41)

• Topological cell clustering in the ATLAS calorimeters and its performance in LHC Run 1
• Jet energy measurement with the ATLAS detector in proton-proton collisions at sqrt(s) = 7 TeV
• Electron performance measurements with the ATLAS detector using the 2010 LHC proton-proton collision data
• Performance of electron and photon triggers in ATLAS during LHC Run 2
• Jet energy measurement and its systematic uncertainty in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Performance of the ATLAS Trigger System in 2010
• Performance of missing transverse momentum reconstruction with the ATLAS detector using proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data
• Measurement of inclusive jet and dijet cross sections in proton-proton collisions at 7 TeV centre-of-mass energy with the ATLAS detector
• Performance of jet substructure techniques for large-R jets in proton-proton collisions at sqrt(s) = 7 TeV using the ATLAS detector
• Search for the Standard Model Higgs boson in the decay channel H->ZZ(*)->4l with 4.8 fb-1 of pp collision data at sqrt(s) = 7 TeV with ATLAS
• Measurement of the W -> lnu and Z/gamma* -> ll production cross sections in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Rapidity gap cross sections measured with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV
• Characterisation and mitigation of beam-induced backgrounds observed in the ATLAS detector during the 2011 proton-proton run
• Magnetic monopoles revisited: Models and searches at colliders and in the Cosmos
• Search for pair production of massive particles decaying into three quarks with the ATLAS detector in sqrt(s) = 7 TeV pp collisions at the LHC
• Performance of the missing transverse momentum triggers for the ATLAS detector during Run-2 data taking
• Search for magnetic monopoles and stable particles with high electric charges in 8 TeV $pp$ collisions with the ATLAS detector
• Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons
• Measurement of distributions sensitive to the underlying event in inclusive Z-boson production in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Measurement of the transverse momentum distribution of W bosons in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Performance of the ATLAS Detector using First Collision Data
• Software and computing for Run 3 of the ATLAS experiment at the LHC
• Measurement of event shapes at large momentum transfer with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV
• Search for Massive Long-lived Highly Ionising Particles with the ATLAS Detector at the LHC
• The ATLAS Experiment at the CERN Large Hadron Collider: A Description of the Detector Configuration for Run 3
• Measurements of underlying-event properties using neutral and charged particles in pp collisions at 900 GeV and 7 TeV with the ATLAS detector at the LHC
• The performance of the jet trigger for the ATLAS detector during 2011 data taking
• Measurement of D*+/- meson production in jets from pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Monitoring and data quality assessment of the ATLAS liquid argon calorimeter
• Studies of the performance of the ATLAS detector using cosmic-ray muons
• Nanosecond machine learning event classification with boosted decision trees in FPGA for high energy physics
• Emulating the impact of additional proton-proton interactions in the ATLAS simulation by pre-sampling sets of inelastic Monte Carlo events
• Measurement of event-shape observables in $Z\to {\ell }^{+}{\ell }^{-}$ events in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector at the LHC
• Precision Measurement of the Specific Activity of ${}^{39}$Ar in Atmospheric Argon with the DEAP-3600 Detector
• Nanosecond machine learning regression with deep boosted decision trees in FPGA for high energy physics
• Hadron Collider Searches for Diboson Resonances
• Resummation schemes for high-electric-charge objects leading to improved experimental mass limits
• Simulation of angular resolution of a new electromagnetic sampling calorimeter
• Improving topological cluster reconstruction using calorimeter cell timing in ATLAS
• Measurement of the Ionization Yield of Neutron-Induced Proton Recoils in Tetramethylsilane