# First analysis of inclined air showers detected by Tunka-Rex

## TL;DR

This paper presents the first analysis of inclined cosmic-ray air showers detected by Tunka-Rex, estimating their energies and evaluating the detector's efficiency for such events.

## Contribution

It introduces the first analysis of inclined air showers by Tunka-Rex, expanding understanding of detection capabilities for high zenith angles.

## Key findings

- Successful energy estimation of inclined events
- Assessment of Tunka-Rex antenna efficiency for inclined showers
- Identification of ultra-high-energy inclined events

## Abstract

The Tunka Radio Extension (Tunka-Rex) is a digital antenna array for the detection of radio emission from cosmic-ray air showers in the frequency band of 30 to 80 MHz and for primary energies above 100 PeV. The standard analysis of Tunka-Rex includes events with zenith angle of up to 50$^\circ$. This cut is determined by the efficiency of the external trigger. However, due to the air-shower footprint increasing with zenith angle and due to the more efficient generation of radio emission (the magnetic field in the Tunka valley is almost vertical), there are a number of ultra-high-energy inclined events detected by Tunka-Rex. In this work we present a first analysis of a subset of inclined events detected by Tunka-Rex. We estimate the energies of the selected events and test the efficiency of Tunka-Rex antennas for detection of inclined air showers.