Extensão do modelo Tandem no contexto do experimento DUNE para o estudo das oscilações de neutrinos

Abstract

Neutrino oscillation was not predicted by the Standard Model. Although there have been adaptations to the Standard Model, the excess of electron neutrinos in the LSND experiment and muon neutrinos in the MiniBooNE experiment already indicated that the phenomenon was not yet fully understood. Physics Beyond the Standard Model (BSM) seeks to solve these and other open questions in particle physics, particularly concerning neutrinos. One of the alternatives for new physics comes from the introduction of Lorentz invariance violation, adding new terms to the Hamiltonian that induce a breaking of CPT symmetry. In this work, we start from the Tandem model, an already established model based on Lorentz invariance violation, and include a new parameter: an imaginary phase, with the aim of observing the change in sensitivity introduced by this factor. The DUNE experiment has a design that favors the investigation of mass hierarchy and CP symmetry, providing data that allow us to evaluate whether there is Lorentz invariance violation. In this work, in the context of this experiment, oscillation simulations were performed to understand how the inclusion of this new parameter in the Tandem model influences the behavior of neutrinos and antineutrinos. As a result, the model proved to be sensitive to small variations in the phase value.