# XIX International Workshop on Neutrino Telescopes

Feb 18 – 26, 2021
Online
Europe/Rome timezone

## The Future of High-Energy Astrophysical Neutrino Flavor Measurements

Feb 22, 2021, 5:50 PM
20m

### Room 2

Parallel Contributed Talk Neutrino Telescopes and Multimessenger

### Speaker

Ningqiang Song (Queen's University and Perimeter Institute)

### Description

The next generation of neutrino telescopes, including Baikal-GVD, KM3NeT, P-ONE, TAMBO, and IceCube-Gen2, will be able to determine the flavor of high-energy astrophysical neutrinos with 10% uncertainties. With the aid of future neutrino oscillation experiments --- in particular JUNO, DUNE, and Hyper-Kamiokande --- the regions of flavor composition at Earth that are allowed by neutrino oscillations will shrink by a factor of ten between 2020 and 2040. We critically examine the ability of future experiments and show how these improvements will help us pin down the source of high-energy astrophysical neutrinos and a sub-dominant neutrino production mechanism with and without unitarity assumed. As an illustration of beyond-the-Standard-Model physics, we also show that the future neutrino measurements will constrain the decay rate of heavy neutrinos to be below $2\times 10^{-5}~$$m$/eV/s assuming they decay into invisible particles.

### Primary authors

Ningqiang Song (Queen's University and Perimeter Institute) Shirley Li (SLAC National Accelerator Laboratory and Fermilab) Carlos Arguelles (Harvard University) Mauricio Bustamante (Niels Bohr International Academy and DARK) Aaron Vincent (Queen’s University and Perimeter Institute for Theoretical Physics)

### Presentation materials

 DOI # 10.5281/zenodo.4748795 futurenu_Song-compressed.pdf The Future of High-Energy Astrophysical Neutrino Flavor Measurements