Arrival direction reconstruction of ultra-high-energy neutrinos with ARA
2019 July 22
Askaryan Radio Array (ARA) deploys antennas in the Antarctic ice with a 3D lattice shape, looking for Askaryan emission produced by interactions of high-energy neutrinos. Currently, the construction of the detector is ongoing, and five independent stations have been deployed. Two types of antennas are used to measure the polarization of the radio wave produced by neutrino-induced showers. Each antenna is designed to be sensitive to a vertically or horizontally-polarized radio wave. The polarization information is important for reconstructing the neutrino direction. We developed a method to reconstruct the neutrino arrival direction by calculating the polarization of the signal using information of two types of antennas. We present the reconstruction method and the angle difference of a true simulation angle and reconstructed angle with taking into account the vertex and detector uncertainties. A bulk ice with a constant refractive index is used in the study. The more realistic angular resolution of neutrino arrival direction will be evaluated with the realistic South Pole ice model in future.