Abstract
We explore the capabilities of the upcoming Deep Underground Neutrino Experiment (DUNE) to measure $\nu_\tau$ charged-current interactions and the associated oscillation probability $P(\nu_\mu \to \nu_\tau)$ at its far detector, concentrating on how such results can be used to probe neutrino properties and interactions. DUNE has the potential to identify significantly more $\nu_\tau$ events than all existing experiments and can use this data sample to nontrivially test the three-massive-neutrinos paradigm by providing complementary measurements to those from the $\nu_e$ appearance and $\nu_\mu$ disappearance channels. We further discuss the sensitivity of the $\nu_\tau$ appearance channel to several hypotheses for the physics that may lurk beyond the three-massive-neutrinos paradigm: a non-unitary lepton mixing matrix, the $3+1$ light neutrinos hypothesis, and the existence of non-standard neutral-current neutrino interactions. Throughout, we also consider the relative benefits of the proposed high-energy tune of the Long-Baseline Neutrino Facility (LBNF) beam-line.
Highlights
Over the last twenty years, our understanding of neutrino-flavor change as a function of the neutrino proper time has improved exponentially
We further discuss the sensitivity of the ντ-appearance channel to several hypotheses for the physics that may lurk beyond the three-massiveneutrinos paradigm: a nonunitary lepton mixing matrix, the 3 þ 1 light neutrinos hypothesis, and the existence of nonstandard neutral-current neutrino interactions
There are several studies in the literature, including those pursued by the collaborations, of the physics reach of Long-Baseline Neutrino Facility (LBNF)-Deep Underground Neutrino Experiment (DUNE) and T2HK, including their sensitivities to a variety of hypothetical new neutrino physics scenarios
Summary
Over the last twenty years, our understanding of neutrino-flavor change as a function of the neutrino proper time has improved exponentially. There are several studies in the literature, including those pursued by the collaborations, of the physics reach of LBNF-DUNE and T2HK, including their sensitivities to a variety of hypothetical new neutrino physics scenarios All of these explore the νμ-disappearance and the νμ → νe appearance (plus antineutrinos) channels. We explore, assuming the threemassive-neutrinos paradigm, how well one can measure the ντ charged-current scattering cross section, and, assuming the standard model expectation for the ντ charged-current scattering cross section, how well the ντ-appearance data can constrain oscillation parameters As far as the latter exercise is concerned, we compare, in different ways, the sensitivity of the ντappearance sample with that of the νe-appearance and νμ-disappearance samples. IV, we present some concluding remarks and highlight a few future research directions one can pursue with ντ-appearance at LBNF-DUNE, including searches in the near detector facility and the atmospheric ντ sample
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