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Towards the measurement of CP violation in neutrino oscillations with the T2K experiment

Abstract : The discovery of neutrino oscillations has demonstrated that neutrinos have mass, which cannot be explained in the framework of the Standard Model. The focus of current and next-generation long-baseline neutrino experiments is the determination of the charge-parity (CP) violating phase and establishing whether neutrino oscillations violate CP symmetry.The T2K (Tokai-to-Kamioka) experiment probes the mass differences and mixing of neutrinos by measuring neutrino oscillations. The unoscillated spectrum, measured at the T2K near detector (ND280), is used to constrain the systematic uncertainties stemming from the flux and cross-sections models. Several improvements in the oscillation analysis framework with the T2K near detector, with a particular focus on updates to the neutrino interaction error model, are presented in this thesis. The results on the oscillation parameters are discussed, and the robustness of the analysis is examined by performing multiple simulated data studies using alternative neutrino interaction models and tunes.T2K plans an upgrade of its near detector, to be installed in 2022. The capabilities of the upgrade in terms of physics performance are examined. An overview of the sensitivity of the next-generation Hyper-Kamiokande experiment is also given. As neutrino physics has now entered an era of precision measurements, the impact of certain systematic parameters on the Hyper-Kamiokande precision is discussed.
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Submitted on : Friday, December 10, 2021 - 2:57:08 PM
Last modification on : Monday, December 13, 2021 - 9:15:04 AM
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  • HAL Id : tel-03474937, version 1

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Laura-Iuliana Munteanu. Towards the measurement of CP violation in neutrino oscillations with the T2K experiment. High Energy Physics - Experiment [hep-ex]. Université Paris-Saclay, 2021. English. ⟨NNT : 2021UPASP049⟩. ⟨tel-03474937⟩

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