Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 100: Cosmic Ray 5

T 100.3: Vortrag

Donnerstag, 24. März 2022, 16:45–17:00, T-H32

Improving gamma-hadron separation for air showers at the IceCube Neutrino Observatory — •Federico Bontempo for the IceCube collaboration — Institute for Astroparticle Physics, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

The IceCube Neutrino Observatory is an experiment located at the geographic South Pole. It is composed of two detectors: an optical array deep in the ice and an array of ice-Cherenkov tanks at the surface called IceTop. The combination of the two detectors can be exploited for the study of cosmic rays. The in-ice detector measures the high-energy muonic component of air showers, whereas the signal strength on IceTop is dominated by the electromagnetic component. The aim of this work is to discriminate between photon and hadron initiated air showers. This discrimination was already attempted using a machine learning technique named Random Forest. Here, a different approach is presented which uses both Random Forests and deep learning techniques, in particular, supervised learning techniques that predicts unknown data after studying labeled data. The physics quantities used for this study are the charges measured by the in-ice detector, the reconstructed zenith angle, the in-ice containment of the shower, the reconstructed energy and a likelihood estimator that captures both the presence of individual muons and charge fluctuations in the surface array.

Furthermore, the planned enhancement of IceTop, comprised of surface radio antennas and scintillator panels, will contribute to the improvement of the gamma-hadron separation.