# IceCube High Energy Starting Events at 7.5 Years -- New Measurements of Flux and Flavor

## TL;DR

This paper presents new measurements of the flux and flavor composition of high-energy astrophysical neutrinos using 7.5 years of IceCube data, providing insights into their sources and production mechanisms.

## Contribution

It introduces a new flavor composition measurement of astrophysical neutrinos using the IceCube High-Energy Starting Event sample over 7.5 years, enhancing understanding of neutrino sources.

## Key findings

- Measured flavor ratio on Earth constrains source models.
- Detected tau neutrino interactions above 100 TeV.
- Provides improved flux estimates of astrophysical neutrinos.

## Abstract

The IceCube Neutrino Observatory at the South Pole, which detects Cherenkov light from charged particles produced in neutrino interactions, firmly established the existence of an astrophysical high-energy neutrino component. Here I present IceCube's High-Energy Starting Event sample and the new results obtained with a livetime of about 7.5 years. I will focus on the new measurement of the flavor composition performed using this sample. IceCube is directly sensitive to each neutrino flavor via the single cascade, track and double cascade event topologies, the latter being the topology produced in tau-neutrino interactions above an energy threshold of ~100 TeV. A measurement of the flavor ratio on Earth can provide important constraints on sources and production mechanisms within the standard model, and also constrain various beyond-standard-model processes.