Measurement of the muon neutrino cross section through charged-current interactions and search for Lorentz invariance violation at the T2K experiment

Abstract : The T2K experiment is a long baseline neutrino oscillation experiment located in Japan. It aims to measure the parameters describing this quantum phenomenon, and particularly, the mixing angle θ13. The latter is measured through the production of a muon neutrino at J-PARC and detection of an electron neutrino 295 km away, at Super-Kamiokande. Since T2K has measured that θ13 ≠ 0 with more than 7σ CL, it leads to the possibility to observe CP violation phase through neutrino oscillation. Through the accurate measurement of the oscillation parameters, T2K aims to determine the first constraints on the CP violation in the leptonic sector. After presenting the theory of neutrino oscillations and the T2K experiment, this thesis first presents the calibration setup, the Cone Generator, that we developed for the Super-Kamiokande far detector. We study the detector uniformity and isotropy, and disentangle the different sources of discrepancies with the detector simulation. We particularly highlight a discrepancy in the simulation of the light reflection on the detector wall. Second, we present the calibration of the charge deposit in the on-axis near detectors, INGRID and the Proton Module. We show that an optical cross-talk between the scintillators of one type is observed, and we correct it. This calibration is used for the first measurement of the CC0π double differential cross section in the Proton Module. The cross section uncertainty is one of the dominant error on neutrino oscillations, and the CC0π channel is dominant in T2K interactions. We show that this measurement is in agreement with the recent results of MiniBooNE. Finally, we present the first Lorentz invariance violation search in the T2K experiment. We show that the neutrino oscillations are one of the most sensitive probes for this effect. We first review the motivations of this search and then present the result using the calibrated INGRID detector. We show that no Lorentz invariance violation is observed in the T2K near detector.
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https://hal-polytechnique.archives-ouvertes.fr/tel-01413989
Contributor : Benjamin Quilain <>
Submitted on : Monday, December 12, 2016 - 6:38:41 AM
Last modification on : Wednesday, March 27, 2019 - 4:40:32 PM
Long-term archiving on : Tuesday, March 28, 2017 - 12:43:46 AM

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  • HAL Id : tel-01413989, version 1

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Benjamin Quilain. Measurement of the muon neutrino cross section through charged-current interactions and search for Lorentz invariance violation at the T2K experiment. High Energy Physics - Experiment [hep-ex]. Ecole polytechnique X, 2014. English. ⟨tel-01413989⟩

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