We explore the capabilities of the upcoming Deep Underground Neutrino Experiment (DUNE) to measure ν τ charged-current interactions and the associated oscillation probability P (ν µ → ν τ ) 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 ν τ 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 ν e appearance and ν µ disappearance channels. We further discuss the sensitivity of the ν τ 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.
General neutrino-scalar couplings appear in many extensions of Standard Model. We can probe these neutrino-scalar couplings by leptonic decay of mesons and from heavy neutrino search. Our analysis improves the present limits to |ge| 2 < 1.9 × 10 −6 and |gµ| 2 < 1.9 × 10 −7 at 90% C.L. for massless scalars. For massive scalars we found for the first time the constraints for g 2 α couplings to be 10 −6 − 10 −1 respectively for scalar masses between up 100 MeV and we have no limits for masses above 300 MeV.
Non-unitary neutrino mixing implies an extra CP violating phase that can fake the leptonic Dirac CP phase δ CP of the simplest three-neutrino mixing benchmark scheme. This would hinder the possibility of probing for CP violation in accelerator-type experiments. We take T2K and T2HK as examples to demonstrate the degeneracy between the "standard" (or "unitary") and "non-unitary" CP phases. We find, under the assumption of non-unitary mixing, that their CP sensitivities severely deteriorate. Fortunately, the TNT2K proposal of supplementing T2(H)K with a µDAR source for better measurement of δ CP can partially break the CP degeneracy by probing both cos δ CP and sin δ CP dependences in the wide spectrum of the µDAR flux. We also show that the further addition of a near detector to the µDAR setup can eliminate the degeneracy completely. *
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