Energy-Dependent Neutrino Mixing Parameters at Oscillation Experiments

TL;DR

This paper explores how energy-dependent neutrino mixing parameters, influenced by quantum corrections and new physics, can cause observable effects in neutrino experiments, including flavor transitions and CP violation.

Contribution

It introduces models showing how light new physics can cause measurable running of neutrino mixing parameters at energies below the weak scale.

Findings

Observable zero-baseline flavor transitions predicted

New sources of CP violation identified

Potential inconsistencies in mixing angle measurements across experiments

Abstract

Neutrino mixing parameters are subject to quantum corrections and hence are scale dependent. This means that the mixing parameters associated to the production and detection of neutrinos need not coincide since these processes are characterized by different energy scales. We show that, in the presence of relatively light new physics, the scale dependence of the mixing parameters can lead to observable consequences in long-baseline neutrino oscillation experiments, such as T2K and NOvA, and in neutrino telescopes like IceCube. We discuss some of the experimental signatures of this scenario, including zero-baseline flavor transitions, new sources of CP-invariance violation, and apparent inconsistencies among measurements of mixing angles at different experiments or oscillation channels. Finally, we present simple, ultraviolet-complete models of neutrino masses which lead to observable running of the neutrino mixing matrix below the weak scale.