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Environnement logiciel et étalonnage de l'échelle en énergie des jets dans l'expérience ATLAS

Abstract : This thesis presents the work achieved to instrument the ATLAS software framework, ATHENA, with a library of tools and utils for the physics analysis as well as the extraction of the jet energy scale using physics events (in-situ calibration).
The software part presents the various components of the ATHENA framework which handles the simulated and reconstructed data flow as well as the different stages of this process, before and during the data taking. The building of a library of tools easing the reconstruction of physics objects, their association with Monte-Carlo particles and their API is then explained. The need for common language and collaboration-wide utils is emphazised as it allows to share the workload of validating these tools and to get reproducible physics results.
The analysis part deals with the implementation of a light jet energy scale calibration algorithm within the C++ framework. This calibration algorithm makes use of W bosons decaying into light jets within semileptonic t events. From the processing of fast and full simulation data with this algorithm, it seems possible to reach a percent level knowledge of the light jet energy scale. Finally, the feasability study of the b-jet energy scale calibration using γZ°\to γb barb events is presented. It is shown that a purely sequential approach is not sufficient to extract the signal nor to collect a sufficient amount of Z° to calibrate the b-jet energy scale.
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Contributor : Jeanine Pellet <>
Submitted on : Friday, April 6, 2007 - 4:01:57 PM
Last modification on : Tuesday, April 20, 2021 - 12:00:10 PM
Long-term archiving on: : Friday, November 25, 2016 - 3:45:34 PM


  • HAL Id : tel-00140524, version 1


S. Binet. Environnement logiciel et étalonnage de l'échelle en énergie des jets dans l'expérience ATLAS. Modélisation et simulation. Université Blaise Pascal - Clermont-Ferrand II, 2006. Français. ⟨tel-00140524⟩



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