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Etude de la production d’un pion dans l’interaction de neutrinos muoniques avec le nouveau détecteur WAGASCI au Japon

Abstract : The Tokai-to-Kamioka experiment (T2K), located in Japan, studies oscillations of muon neutrinos and antineutrinos. It aims to measure neutrino mixing parameters, such as the mixing angle θ13 and the CP-symmetry violating phase. The principal uncertainty on these measurements relates to the limited knowledge on neutrino-nucleus interactions on various target materials in the detectors. In order to reduce these systematic uncertainties, the WAGASCI detector – a lattice of scintillator bars in a water tank – has been built and installed in 2016 at J-PARC (Tokai, Japan).In this thesis we introduce neutrino oscillations alongside the nuclear effects required to describe how neutrinos interact with nuclei. We also show how the first WAGASCI module, the so-called WaterModule, was built in autumn 2015 in Tokai. The charge calibration of the WaterModule is also presented.The first WaterModule data are used to measure the muon neutrino charged-current cross section with one charged pion in the final state (CC1π channel). We detail the steps leading to this measurement: the particle identification; the selection of CC1π-candidate events; and the study of statistical and systematic uncertainties. To extract the double differential cross section with respect to muon momentum and angle, we use an iterative unfolding approach that requires a convergence criterion. We present this method and a way to build a data-driven convergence criterion.This measurement, as well as all coming measurements from the full WAGASCI detector, will contribute to significantly reduce the systematic errors for the T2K experiment. We will thus take a step further towards the measurement of the CP-symmetry violating phase.
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Submitted on : Thursday, October 18, 2018 - 11:41:15 AM
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  • HAL Id : tel-01898261, version 1


Matthieu Licciardi. Etude de la production d’un pion dans l’interaction de neutrinos muoniques avec le nouveau détecteur WAGASCI au Japon. Physique des Hautes Energies - Expérience [hep-ex]. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLX048⟩. ⟨tel-01898261⟩



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