# IceCube Flavor Ratios with Identified Astrophysical Sources: Towards Improving New Physics Testability

## TL;DR

This paper explores how future high-statistics neutrino observations from identified astrophysical sources like blazars can enhance tests of new physics scenarios affecting neutrino flavor ratios, such as pseudo-Dirac neutrinos and decay.

## Contribution

It demonstrates that increased data from identified sources will improve constraints on new physics models that influence neutrino oscillation probabilities.

## Key findings

- Enhanced constraints on pseudo-Dirac neutrinos.
- Potential to test neutrino decay scenarios.
- Improved flavor ratio measurements with IceCube-Gen2.

## Abstract

Motivated by the discovery of the first high-energy astrophysical neutrino source, the blazar TXS 0506+056, we revisit the IceCube flavor ratio analysis. Assuming large statistics from identified blazars, collected in the forthcoming years by the IceCube detector and its successor IceCube-Gen2, we demonstrate that the constraints on several new physics scenarios in which the baseline dependent terms in neutrino oscillation probabilities are not averaged, can be improved. As a representative case, we consider pseudo-Dirac neutrinos while neutrino decay is also discussed.