Reconstruction of highly inclined extensive air showers in GRAND

TL;DR

This paper presents a preliminary reconstruction method for highly inclined extensive air showers detected by GRAND, utilizing a spherical wavefront model and amplitude distribution functions to determine shower parameters.

Contribution

It introduces a novel reconstruction pipeline that models spherical wavefronts and accounts for asymmetries in radio signals for inclined air showers.

Findings

Preliminary results demonstrate the feasibility of the reconstruction method.

The approach effectively models signal arrival times and amplitudes.

Initial tests show promising accuracy in reconstructing shower parameters.

Abstract

The Giant Radio Array for Neutrino Detection (GRAND) aims to detect highly inclined extensive air showers (EAS) with down-going and up-going trajectories. Several working groups in the GRAND collaboration are developing methods to reconstruct the incoming direction, core position, primary energy, and composition of the showers. The reconstruction pipeline -- currently under development in the France/IAP working group -- relies on a model of spherical wavefront emission for arrival times, which is possible because the radio signals are generated far away from the antenna stations. The amplitude distribution of the signals at the antenna level is described by an Angular Distribution Function that considers various asymmetries in the data, including geomagnetic effects. In this contribution, we present preliminary results from testing our EAS reconstruction procedure using realistic mock observations.