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T: Fachverband Teilchenphysik

T 81: Neutrino astronomy III

T 81.1: Vortrag

Donnerstag, 2. April 2020, 16:30–16:45, H-1.004

Observations of the Moon Shadow in Cosmic-Ray-Induced Muons with the IceCube Neutrino Observatory — •Saskia Philippen, Johannes Merz, René Reimann, and Christopher Wiebusch for the IceCube collaboration — III. Physikalisches Institut B RWTH Aachen

Calibrating the directional reconstruction of neutrino-induced muons in IceCube is a challenging task. As no luminous neutrino source exists in the sky, pointing and resolution are often estimated by Monte-Carlo methods. Experimentally, IceCube uses cosmic-ray-induced atmospheric muons for various calibration purposes. Particularly useful is the effect that cosmic rays are absorbed by the moon, resulting in a deficit of cosmic-ray muons from the lunar direction. This "Moon Shadow" finds application in the verification of the angular resolution and pointing of the detector as well as for source analyses. In this talk, the improvements in the directional uncertainty estimation of events and in the background determination are presented. The point source hypothesis is extended to a disc source hypothesis, which allows a scan of the radius of the moon. These improvements are tested against the standard analysis methods using the Moon Shadow. Furthermore, ideas to measure the impact of Earth's magnetic field with the usage of the Moon Shadow analysis are discussed.