Leptonic CP violation at neutrino telescopes

TL;DR

This paper explores how high-energy neutrino flux ratios at telescopes can potentially reveal leptonic CP violation by showing a measurable dependence on the CP-violating phase, especially with precise flux measurements.

Contribution

It demonstrates that neutrino flux ratios depend on the CP-violating phase and can distinguish CP-violating from CP-conserving scenarios with sufficiently accurate measurements.

Findings

Flux ratios depend on the CP-violating phase by about 10%.

Precise flux measurements (<10% uncertainty) can identify CP violation at 2σ.

Potential to distinguish CP phases near maximal CP violation.

Abstract

With the advent of the recent measurements in neutrino physics, we investigate the role of high-energy neutrino flux ratios at neutrino telescopes for the possibility of determining the leptonic CP-violating phase \delta and the underlying pattern of the leptonic mixing matrix. We find that the flux ratios show a dependence of O(10 %) on the CP-violating phase, and for optimistic uncertainties on the flux ratios less than 10 %, they can be used to distinguish between CP-conserving and CP-violating values of the phase at 2\sigma in a non-vanishing interval around the maximal value |\delta|=\pi/2.