C. P. Bee
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View article: The DAQ/HLT system of the ATLAS experiment
The DAQ/HLT system of the ATLAS experiment Open
The DAQ/HLT system of the ATLAS experiment at CERN, Switzerland, is being commissioned for first collisions in 2009. Presently, the system is composed of an already very large farm of computers that accounts for about one-third of its fina…
View article: Integration of the trigger and data acquisition systems in ATLAS
Integration of the trigger and data acquisition systems in ATLAS Open
During 2006 and the first half of 2007, the installation, integration and commissioning of trigger and data acquisition (TDAQ) equipment in the ATLAS experimental area have progressed. There have been a series of technical runs using the f…
View article: Event reconstruction algorithms for the ATLAS trigger
Event reconstruction algorithms for the ATLAS trigger Open
The ATLAS experiment under construction at CERN is due to begin operation at the end of 2007. The detector will record the results of proton-proton collisions at a centerof- mass energy of 14 TeV. The trigger is a three-tier system designe…
View article: Overview of the High-Level Trigger Electron and Photon Selection for the ATLAS Experiment at the LHC
Overview of the High-Level Trigger Electron and Photon Selection for the ATLAS Experiment at the LHC Open
The ATLAS experiment at the Large Hadron Collider (LHC) will face the challenge of efficiently selecting interesting candidate events in pp collisions at 14 TeV center-of-mass energy, whilst rejecting the enormous number of background even…
View article: Deployment of the ATLAS High-Level Trigger
Deployment of the ATLAS High-Level Trigger Open
The ATLAS combined test beam in the second half of 2004 saw the first deployment of the ATLAS High-Level Trigger (HLT). The next steps are deployment on the pre-series farms in the experimental area during 2005, commissioning and cosmics t…
View article: Online muon reconstruction in the ATLAS level-2 trigger system
Online muon reconstruction in the ATLAS level-2 trigger system Open
To cope with the 40 MHz event production rate of LHC, the trigger of the ATLAS experiment selects the events in three sequential steps of increasing complexity and accuracy whose final results are close to the offline reconstruction. The L…
View article: IMPLEMENTATION AND PERFORMANCE OF A TAU LEPTON SELECTION WITHIN THE ATLAS TRIGGER SYSTEM AT THE LHC
IMPLEMENTATION AND PERFORMANCE OF A TAU LEPTON SELECTION WITHIN THE ATLAS TRIGGER SYSTEM AT THE LHC Open
The ATLAS experiment at the Large Hadron Collider (LHC) has an interaction rate of up to $10^9$ Hz. The trigger must efficiently select interesting events while rejecting the large amount of background. The First Level trigger will reduce …
View article: Implementation and performance of the third level muon trigger of the ATLAS experiment at LHC
Implementation and performance of the third level muon trigger of the ATLAS experiment at LHC Open
The trigger system of the ATLAS experiment at the LHC aims at a high selectivity in order to keep the full physics potential while reducing the 40 MHz initial event rate imposed by the LHC bunch crossing down to similar to 100 Hz, as requi…
View article: Design, deployment and functional tests of the online event filter for the ATLAS experiment at LHC
Design, deployment and functional tests of the online event filter for the ATLAS experiment at LHC Open
The Event Filter (EF) selection stage is a fundamental component of the ATLAS Trigger and Data Acquisition architecture. Its primary function is the reduction of data flow and rate to values acceptable by the mass storage operations and by…
View article: Implementation and performance of the seeded reconstruction for the ATLAS event filter selection software
Implementation and performance of the seeded reconstruction for the ATLAS event filter selection software Open
ATLAS is one of the four LHC experiments that will start data taking in 2007, designed to cover a wide range of physics topics. The ATLAS trigger system has to cope with a rate of 40 MHz and 23 interactions per bunch crossing. It is divide…
View article: Algorithms for the ATLAS high-level trigger
Algorithms for the ATLAS high-level trigger Open
Following rigorous software design and analysis methods, an object-based architecture has been developed to derive the second- and third-level trigger decisions for the future ATLAS detector at the LHC. The functional components within thi…
View article: An overview of the ATLAS high-level trigger dataflow and supervision
An overview of the ATLAS high-level trigger dataflow and supervision Open
The ATLAS High Level Trigger (HLT) system provides software-based event selection after the initial LVL1 hardware trigger. It is composed of two stages, the LVL2 trigger and the Event Filter (EF). The LVL2 trigger performs event selection …
View article: The second level trigger of the ATLAS experiment at CERN's LHC
The second level trigger of the ATLAS experiment at CERN's LHC Open
The ATLAS trigger reduces the rate of interesting events to be recorded for off-line analysis in three successive levels from 40 MHz to /spl sim/100 kHz, /spl sim/2 kHz and /spl sim/200 Hz. The high level triggers and data acquisition syst…
View article: Studies for a common selection software environment in ATLAS: from the level-2 trigger to the offline reconstruction
Studies for a common selection software environment in ATLAS: from the level-2 trigger to the offline reconstruction Open
The Atlas High Level Trigger's primary function of event selection will be accomplished with a Level-2 trigger farm and an Event Filter farm, both running software components developed in the Atlas offline reconstruction framework. While t…
View article: Search for CP violation in the decay of neutral kaons to π+π−π0
Search for CP violation in the decay of neutral kaons to π+π−π0 Open
The time-dependent rate asymmetry of initial \\ko and \\kob decaying into \\threepi was measured in order to reveal the CP-violating amplitude of the \\ks \\rightarrow \\threepi decay. For the real and the imaginary parts of \\eta_{+-0}, w…
View article: Tests of CPT symmetry and quantum mechanics with experimental data from CPLEAR
Tests of CPT symmetry and quantum mechanics with experimental data from CPLEAR Open
We use fits to recent published CPLEAR data on neutral kaon decays to \\pi^+\\pi^- and \\pi e\\nu to constrain the CPT--violation parameters appearing in a formulation of the neutral kaon system as an open quantum-mechanical system. The ob…
View article: Measurement of the KL-KS mass difference using semileptonic decays of tagged neutral kaons
Measurement of the KL-KS mass difference using semileptonic decays of tagged neutral kaons Open
We present a new measurement of the KL-KS mass difference (Δm) using semileptonic decays of neutral kaons. The measurement yields Δm = (0.5274 ± 0.0029stat. ± 0.0005syst.) × 1010ħ/s.
View article: Measurement of the CP violation parameter η+− using tagged K0 and 0
Measurement of the CP violation parameter η+− using tagged K0 and 0 Open
The CP violation parameter η+- is determined through the eigentime-dependent asymmetry in the rates of initially tagged K0 and K0 decaying to π+π-. The obtained values are |η+-| = (2.312 ± 0.043stat. ± 0.030syst. ± 0.011τs) × 10-3 and Φ+- …
View article: Comparison of forward hadrons produced in muon interactions on nuclear targets and deuterium
Comparison of forward hadrons produced in muon interactions on nuclear targets and deuterium Open
Differential multiplicities of forward produced hadrons in deep inelastic muon scattering on nuclear targets have been compared with those from deuterium. The ratios are observed to increase towards unity as the virtual photon energy incre…
View article: An investigation of the spin structure of the proton in deep inelastic scattering of polarised muons on polarised protons
An investigation of the spin structure of the proton in deep inelastic scattering of polarised muons on polarised protons Open
The spin asymmetry in deep inelastic scattering of longitudinally polarised muons by longitudinally polarised protons has been measured in the range 0.01<×<0.7. The spin dependent structure function g1(x) for the proton has been determined…
View article: A measurement of the spin asymmetry and determination of the structure function g1 in deep inelastic muon-proton scattering
A measurement of the spin asymmetry and determination of the structure function g1 in deep inelastic muon-proton scattering Open
The spin asymmetry in deep inelastic scattering of longitudinally polarised muons by longitudinally polarised protons has been measured over a large x range (0.01<x<0.7). The spin-dependent structure function g1(x) for the proton has been …