Unitarity Tests of the Neutrino Mixing Matrix

Abstract

We discuss unitarity tests of the neutrino mixing (PMNS) matrix. We show that the combination of solar neutrino experiments, medium-baseline and short-baseline reactor antineutrino experiments make it possible to perform the first direct unitarity test of the PMNS matrix. In particular, the measurements of Daya Bay and JUNO (a next generation medium-baseline reactor experiment) will lay the foundation of a precise unitarity test of $|U_{e1}{|}^2+|U_{e2}{|}^2+|U_{e3}{|}^2=1$. Furthermore, the precision measurement of ${\sin }^{2}2{\theta }_{13}$ in both the ${\bar{\nu }}_e$ disappearance and the ${\nu }_e$ appearance (from a ${\nu }_{\mu }$ beam) channels will provide an indirect unitarity test of the PMNS matrix. Together with the search for appearance/disappearance at very short distances, these tests could provide important information about the possible new physics beyond the three-neutrino model.

Cited by in corpus (10)

• Neutrino Mass Hierarchy
• Physics with Beam Tau-Neutrino Appearance at DUNE
• Probing the Majorana neutrinos and their CP violation in decays of charged scalar mesons $\pi ,K,D,D_s,B,B_c$
• Neutrino Oscillation Studies with Reactors
• A framework for testing leptonic unitarity by neutrino oscillation experiments
• Searches for new physics at the Hyper-Kamiokande experiment
• Neutrino mass hierarchy determination and other physics potential of medium-baseline reactor neutrino oscillation experiments
• New oscillation and scattering constraints on the tau row matrix elements without assuming unitarity
• Indirect unitarity violation entangled with matter effects in reactor antineutrino oscillations
• Reactor Neutrino Experiments: ${\theta }_{13}$ and Beyond