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A bstract We consider the ν μ → ν τ appearance channel in the future Deep Underground Neutrino Experiment (DUNE) which offers a good statistics of the ν τ sample. In order to measure its impact on constraining the oscillation parameters, we consider several assumptions on the efficiency for ν τ charged-current signal events (with subsequent τ → e decay) and the related backgrounds and study the effects of various systematic uncertainties. Two different neutrino fluxes have been considered, namely a CP-violation optimized flux and a ν τ optimized flux. Our results show that the addition of the ν μ → ν τ appearance channel does not reduce the current uncertainties on the standard 3- ν oscillation parameters while it can improve in a significant way the sensitivity to the Non-Standard Interaction parameter |∈ μτ | and to the new mixing angle θ 34 of a sterile neutrino model of the 3 + 1 type.

Different new physics models can introduce new sources of CP violation in the neutrino oscillation probabilities. We studied the potential of the DUNE experiment to look for them, in the case of sterile neutrinos and Non-Standard Interactions, measuring only the CP asymmetries in different oscillation channels. We show that if a high energy flux will be used, the asymmetry related to the ν μ → ν e appearance channel could be very useful to search for hints of new physics.

We consider the νμ→ ντ appearance channel in the future Deep Underground Neutrino Experiment (DUNE) which offers a good statistics of the ντ sample. In order to measure its impact on constraining the oscillation parameters, we consider several assumptions on the efficiency for ντ charged-current signal events (with subsequent τ → e decay) and the related backgrounds and study the effects of various systematic uncertainties. Two different neutrino fluxes have been considered, namely a CP-violation optimized flux and a ντ optimized flux.Our results show that the addition of the νμ→ ντ appearance channel does not reduce the current uncertainties on the standard 3-ν oscillation parameters while it can improve in a significant way the sensitivity to the Non-Standard Interaction parameter |∈μτ| and to the new mixing angle θ34 of a sterile neutrino model of the 3 + 1 type.

A bstract This study provides an analysis of atmospheric neutrino oscillations at the ESSnuSB far detector facility. The prospects of the two cylindrical Water Cherenkov detectors with a total fiducial mass of 540 kt are investigated over 10 years of data taking in the standard three-flavor oscillation scenario. We present the confidence intervals for the determination of mass ordering, θ 23 octant as well as for the precisions on sin 2 θ 23 and Δ m 31 2 . It is shown that mass ordering can be resolved by 3 σ CL (5 σ CL) after 4 years (10 years) regardless of the true neutrino mass ordering. Correspondingly, the wrong θ 23 octant could be excluded by 3 σ CL after 4 years (8 years) in the case where the true neutrino mass ordering is normal ordering (inverted ordering). The results presented in this work are complementary to the accelerator neutrino program in the ESSnuSB project.

ESSnuSB is a design study for an experiment to measure the CP violation in the leptonic sector at the second neutrino oscillation maximum using a neutrino beam driven by the uniquely powerful ESS linear accelerator. The reduced impact of systematic errors on sensitivity at the second maximum allows for a very precise measurement of the CP violating parameter. This review describes the fundamental advantages of measurement at the second maximum, the necessary upgrades to the ESS linac in order to produce a neutrino beam, the near and far detector complexes, and the expected physics reach of the proposed ESSnuSB experiment, concluding with the near future developments aimed at the project realization.

This short review discusses recent applications of Reinforcement Learning (RL) techniques to the flavor problem in particle physics. Traditional approaches to fermion masses and mixing often rely on extensions of the Standard Model based on horizontal symmetries, but the vast landscape of possible models makes systematic exploration infeasible. Recent works have shown that RL can efficiently navigate this landscape by constructing models that reproduce observed quark and lepton observables. These approaches demonstrate that RL not only rediscovers models already proposed in the literature but also uncovers new, phenomenologically acceptable solutions.

We check the capability of the DUNE neutrino experiment to detect new sources of leptonic CP violation beside the single phase expected in the Standard Model. We illustrate our strategy based on the measurement of CP asymmetries in the case New Physics will show up as Non-Standard neutrino Interactions and sterile neutrino states and show that the most promising one, once the experimental errors are taken into account in both scenarios, is the one related to the \\(\\nu_\\mu \\to \\nu_e\\) transition.

The flavour composition of a future supernova neutrino signal is expected to carry measurable imprints of flavour conversion processes in the dense stellar medium. In this work, we analyse the sensitivity of the upcoming Deep Underground Neutrino Experiment (DUNE) to three phenomenologically distinct effects: slow energy-dependent collective oscillations, fast energy-independent collective oscillations, and standard MSW conversions. By integrating GLoBES and MultiNest and using benchmark neutrino fluxes at emission, we assess the potential of DUNE to extract the underlying flux parameters and discriminate among conversion scenarios.

We build upon a simple \\(U(2)_F\\) model of flavor, in which all fermion masses and mixing hierarchies arise from powers of two small parameters controlling \\(U(2)_F\\) breaking. In the original formulation, an isomorphism to the discrete \\(D_6 U(1)_F\\) symmetry was invoked to generate a Majorana neutrino mass term. Here, we retain the successful features of that model for the charged leptons and quarks, while exploring alternative neutrino charge assignments within the \\(U(2)_F\\) framework. This approach allows us to generate Majorana neutrino masses via the see-saw mechanism without introducing any additional symmetries nor invoking any isomorphism. We further examine the implications of our models for Lepton Flavor Violating (LFV) decays, analyzing the processes \\( e\\), \\(\\) and \\( e\\) and their connection with the leptonic anomalous magnetic moments. We show that within the Standard Model Effective Field Theory (SMEFT) approach the current limits on the branching ratios of \\( e\\) LFV decays obtained in our \\(U(2)_F\\) models are not compatible with the central value of the recent measurement of the \\((g-2)_\\), thereby suggesting that either \\((g-2)_\\) must be very close to the Standard Model predictions, as the latest experimental and theoretical results seem to suggest, or the invoked flavor symmetry is not appropriate to describe an anomalous muon magnetic moment.

We build upon a simple \\(U(2)_F\\) model of flavor, in which all fermion masses and mixing hierarchies arise from powers of two small parameters controlling \\(U(2)_F\\) breaking. In the original formulation, an isomorphism to the discrete \\(D_6 U(1)_F\\) symmetry was invoked to generate a Majorana neutrino mass term. Here, we retain the successful features of that model for the charged leptons and quarks, while exploring alternative neutrino charge assignments within the \\(U(2)_F\\) framework. This approach allows us to generate Majorana neutrino masses via the seesaw mechanism without introducing any additional symmetries nor invoking any isomorphism. We further examine the implications of our models for Lepton Flavor Violating (LFV) decays, analyzing the processes \\( e\\), \\(\\) and \\( e\\) and their connection with the leptonic anomalous magnetic moments. We show that within the Standard Model Effective Field Theory (SMEFT) approach the current limits on the branching ratios of LFV decays obtained in our \\(U(2)_F\\) models are not compatible with the anomaly observed for \\((g-2)_\\), thereby suggesting that either \\((g-2)_\\) must be very close to the Standard Model predictions or the invoked flavor symmetry is not appropriate to describe the current anomalies.