New oscillation and scattering constraints on the tau row matrix elements without assuming unitarity

Abstract

The tau neutrino is the least well measured particle in the Standard Model. Most notably, the tau neutrino row of the lepton mixing matrix is quite poorly constrained when unitarity is not assumed. In this paper, we identify data sets involving tau neutrinos that improve our understanding of the tau neutrino part of the mixing matrix, in particular ${\nu }_{\tau }$ appearance in atmospheric neutrinos. We present new results on the elements of the tau row leveraging existing constraints on the electron and muon rows for the cases of unitarity violation, with and without kinematically accessible steriles. We also show the expected sensitivity due to upcoming experiments and demonstrate that the tau neutrino row precision may be comparable to the muon neutrino row in a careful combined fit.

29 pages, 5 figures, 2 tables, many tau neutrinos; comments welcome! v2: matches published version

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Cited by in corpus (9)

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• Model-Independent Constraints on Non-Unitary Neutrino Mixing from High-Precision Long-Baseline Experiments
• Towards Resolving the Gallium Anomaly
• Distinctive nuclear signatures of low-energy atmospheric neutrinos
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