Stephan A. Sandvoss Topics in the Measurement of Top Quark Events with ATLAS Pixel Detector Optoelectronics, Track Impact Parameter Calibration, Acceptance Correction Methods ISBN: 978-3-8322-8943-0 Preis: 48,80 € / 97,60 SFR |
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The LHC and its experiments will open new possibilities to study precisely the properties of known particles such as the top quark and to find particles never observed before. . Careful operation, maintenance and tuning of the detectors and their readout systems a,re mandatory, in order to obtain high statistics data, samples and perform precision measurements. The control and the readout of the ATLAS pixel detector is performed through an optical transmission line. The installation and commissioning of the optical cables as well as the steps from the production to the operation of the Back of Crate cards, which are the optical interface on the off-detector side, are presented in this thesis. Tests of the optical cables have been developed and realized. These tests ensure a complete functionality of all optical cables and prove its operation within given limits. Similarly, the full operability of the Back of Crate cards is assured by » precise production, extensive tests and a. careful installation. Since spring 200S, the readout of the pixel detector is ready for operation. Data, was taken successfully during cosmics runs, and the tuning of detector and readout is ongoing. A method to map MC distributions of track impact parameters on data was developed, implemented and tested by using misaligned MC samples as data. From the experience, gained by the Tevatron experiments CDF and DO Monte Carlo generators were tuned to predict top (mark observables at the LHC. A comparison of five common MC generators was done for the total selection efficiencies and for many distributions, for example the transverse momentum and pseudorapidity of the hadronically decaying top quark. Likewise, detector effects on these distributions were studied by using a full detector simulation and (went reconstmction. A method was developed, implemented and tested to reweight the MC distributions from one observable, for example the transverse momentum of the hadronically decaying top quark, such that they agree better with pseudo data, (orig.) | |
Quelle: | FIZ Karlsruhe|
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