# Neutrinos below 100 TeV from the southern sky employing refined veto techniques to IceCube data

## TL;DR

This paper advances data selection techniques in IceCube to detect sub-100 TeV neutrinos from the southern sky, enabling more sensitive searches for galactic neutrino sources despite high atmospheric muon backgrounds.

## Contribution

It introduces refined veto and pattern recognition methods to improve detection of low-energy neutrinos from the southern sky in IceCube.

## Key findings

- No significant neutrino clustering observed.
- Upper limits set on neutrino fluxes from southern hemisphere sources.
- Enhanced background suppression allows for future southern sky neutrino searches.

## Abstract

Many Galactic sources of gamma rays, such as supernova remnants, are expected to produce neutrinos with a typical energy cutoff well below 100 TeV. For the IceCube Neutrino Observatory located at the South Pole, the southern sky, containing the inner part of the Galactic plane and the Galactic Center, is a particularly challenging region at these energies, because of the large background of atmospheric muons. In this paper, we present recent advancements in data selection strategies for track-like muon neutrino events with energies below 100 TeV from the southern sky. The strategies utilize the outer detector regions as veto and features of the signal pattern to reduce the background of atmospheric muons to a level which, for the first time, allows IceCube searching for point-like sources of neutrinos in the southern sky at energies between 100 GeV and several TeV in the muon neutrino charged current channel. No significant clustering of neutrinos above background expectation was observed in four years of data recorded with the completed IceCube detector. Upper limits on the neutrino flux for a number of spectral hypotheses are reported for a list of astrophysical objects in the southern hemisphere.