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Reconstruction et analyse d'interactions de neutrinos dans les blocs cibles émulsion d'OPERA et discrimination du fond charmé dans le canal tau->3h.

Abstract : OPERA (Gran-Sasso, Italy) is a long-baseline neutrino experiment dedicated to the tau neutrino detection in a pure muon neutrino beam, produced at CERN (730 km away). The main goal is to observe the numu->nutau oscillation.
The experiment uses a hybrid technology with electronic detectors and target blocks made of lead plates interleaved with nuclear emulsion sheets, in order to sign efficiently the nutau interactions. The fundamental features of OPERA are its particle reconstruction performances achieved in spatial and angular resolutions. First studies done in this thesis concern the development of several analysis tools like the particle momentum determination using the multiple coulomb scattering in target, and a method of neutrino interaction reconstruction for multi-vertex events. Then it has been possible to develop a multivariable analysis in order to separate tau and charmed events in the tau decay channel into three charged hadrons. These tools have been tested with neutrino interactions observed first with the OPERA test-beam called PEANUT, then with the OPERA events accumulated during the first CNGS run in 2007. The combined analysis of these events has shown that both the analysis method and the OPERA detector behaviour are well understood.
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https://tel.archives-ouvertes.fr/tel-00322932
Contributor : Magali Besnier Connect in order to contact the contributor
Submitted on : Friday, September 19, 2008 - 10:02:30 AM
Last modification on : Friday, November 6, 2020 - 3:34:19 AM
Long-term archiving on: : Monday, October 8, 2012 - 1:20:18 PM

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  • HAL Id : tel-00322932, version 1

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Magali Besnier. Reconstruction et analyse d'interactions de neutrinos dans les blocs cibles émulsion d'OPERA et discrimination du fond charmé dans le canal tau->3h.. Physique des Hautes Energies - Expérience [hep-ex]. Université de Savoie, 2008. Français. ⟨tel-00322932⟩

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