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| 2. |
- Aad, G., et al.
(författare)
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Commissioning of the ATLAS Muon Spectrometer with cosmic rays
- 2010
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Ingår i: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 70:3, s. 875-916
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Tidskriftsartikel (refereegranskat)abstract
- The ATLAS detector at the Large Hadron Collider has collected several hundred million cosmic ray events during 2008 and 2009. These data were used to commission the Muon Spectrometer and to study the performance of the trigger and tracking chambers, their alignment, the detector control system, the data acquisition and the analysis programs. We present the performance in the relevant parameters that determine the quality of the muon measurement. We discuss the single element efficiency, resolution and noise rates, the calibration method of the detector response and of the alignment system, the track reconstruction efficiency and the momentum measurement. The results show that the detector is close to the design performance and that the Muon Spectrometer is ready to detect muons produced in high energy proton-proton collisions.
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| 4. |
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| 5. |
- Aad, G., et al.
(författare)
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Studies of the performance of the ATLAS detector using cosmic-ray muons
- 2011
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Ingår i: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 71:3
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Tidskriftsartikel (refereegranskat)abstract
- Muons from cosmic-ray interactions in the atmosphere provide a high-statistics source of particles that can be used to study the performance and calibration of the ATLAS detector. Cosmic-ray muons can penetrate to the cavern and deposit energy in all detector subsystems. Such events have played an important role in the commissioning of the detector since the start of the installation phase in 2005 and were particularly important for understanding the detector performance in the time prior to the arrival of the first LHC beams. Global cosmic-ray runs were undertaken in both 2008 and 2009 and these data have been used through to the early phases of collision data-taking as a tool for calibration, alignment and detector monitoring. These large datasets have also been used for detector performance studies, including investigations that rely on the combined performance of different subsystems. This paper presents the results of performance studies related to combined tracking, lepton identification and the reconstruction of jets and missing transverse energy. Results are compared to expectations based on a cosmic-ray event generator and a full simulation of the detector response.
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| 6. |
- Aad, G., et al.
(författare)
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The ATLAS Inner Detector commissioning and calibration
- 2010
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Ingår i: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 70:3, s. 787-821
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Tidskriftsartikel (refereegranskat)abstract
- The ATLAS Inner Detector is a composite tracking system consisting of silicon pixels, silicon strips and straw tubes in a 2 T magnetic field. Its installation was completed in August 2008 and the detector took part in data-taking with single LHC beams and cosmic rays. The initial detector operation, hardware commissioning and in-situ calibrations are described. Tracking performance has been measured with 7.6 million cosmic-ray events, collected using a tracking trigger and reconstructed with modular pattern-recognition and fitting software. The intrinsic hit efficiency and tracking trigger efficiencies are close to 100%. Lorentz angle measurements for both electrons and holes, specific energy-loss calibration and transition radiation turn-on measurements have been performed. Different alignment techniques have been used to reconstruct the detector geometry. After the initial alignment, a transverse impact parameter resolution of 22.1 +/- 0.9 mu m and a relative momentum resolution sigma (p) /p=(4.83 +/- 0.16)x10(-4) GeV(-1)xp (T) have been measured for high momentum tracks.
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| 7. |
- Aad, G., et al.
(författare)
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The ATLAS Simulation Infrastructure
- 2010
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Ingår i: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 70:3, s. 823-874
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Tidskriftsartikel (refereegranskat)abstract
- The simulation software for the ATLAS Experiment at the Large Hadron Collider is being used for large-scale production of events on the LHC Computing Grid. This simulation requires many components, from the generators that simulate particle collisions, through packages simulating the response of the various detectors and triggers. All of these components come together under the ATLAS simulation infrastructure. In this paper, that infrastructure is discussed, including that supporting the detector description, interfacing the event generation, and combining the GEANT4 simulation of the response of the individual detectors. Also described are the tools allowing the software validation, performance testing, and the validation of the simulated output against known physics processes.
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| 8. |
- Bjelke, Ulf, et al.
(författare)
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Mollusca : Blötdjur - Molluscs
- 2010
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Ingår i: The 2010 Red List of Swedish Species. Rödlistade arter i Sverige 2010. - Uppsala : ArtDatabanken, SLU. - 9789188506351 ; , s. 495-505
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 9. |
- Lindfors, Petra, et al.
(författare)
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Allostatic load and clinical risk as related to sense of coherence in middle-aged women.
- 2006
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Ingår i: Psychosomatic Medicine. - : Ovid Technologies (Wolters Kluwer Health). - 0033-3174 .- 1534-7796. ; 68:5, s. 801-807
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To investigate how physiologic dysregulation, in terms of allostatic load and clinical risk, respectively, relates to sense of coherence (SOC) in women with no previously diagnosed pathology. Methods: At baseline, 200 43-year-old women took part in a standardized medical health examination and completed a 3-item measure of SOC, which they completed again 6 years later. According to data from the medical examination, two different measures of physiologic dysregulation were calculated: a) a measure of allostatic load based on empirically derived cut points and b) a measure of clinical risk based on clinically significant cut points. Results: In line with the initial hypotheses, allostatic load was found to predict future SOC, whereas clinical risk did not. In addition to baseline SOC and nicotine consumption, allostatic load was strongly associated with a weak SOC at the follow-up. Conclusions: The better predictive value of allostatic load to clinical risk indicates that focusing solely on clinical risk obscures patterns of physiologic dysregulation that influence future SOC.
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| 10. |
- Lindfors, Petra, et al.
(författare)
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Sense of Coherence and Biomarkers of Health in 43-Year-Old Women.
- 2005
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Ingår i: International Journal of Behavioral Medicine. - 1070-5503. ; 12:2, s. 98-102
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this cross-sectional study was to investigate how sense of coherence (SOC) relates to biomarkers of health in 43-year-old nonsmoking premenopausal women. Before taking part in a standardized medical health examination including assessment of blood pressure, blood lipids, and physical symptoms, participants completed a three-item measure of SOC. On the basis of their SOC scores, the 244 women with complete datasets were categorized into 1 of 3 groups with a weak, intermediate, or strong SOC. Results showed that women with a strong SOC had significantly lower levels of systolic blood pressure (p < .05) and total cholesterol (p < .05) than did women with a weak SOC. It is suggested that the lower levels of systolic blood pressure and total cholesterol found in women with a strong SOC may constitute a biological buffer against ill health and disease.
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