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T: Fachverband Teilchenphysik

T 46: Cosmic Rays II

T 46.9: Vortrag

Dienstag, 16. März 2021, 18:00–18:15, Tu

Studies of Lorentz Violation using Air Shower Data — •Fabian Duenkel, Marcus Niechciol und Markus Risse — Center for Particle Physics Siegen, Experimentelle Teilchenphysik, Universität Siegen

Due to their extremely high energies, cosmic rays are ideally suited to search for new physics, for example violations of Lorentz invariance. Isotropic, nonbirefringent Lorentz violation is considered in the following, specializing to the case of a photon velocity which is larger than the maximum attainable velocity of standard Dirac fermions. Earth-based bounds on this type of Lorentz violation have been determined before by observations of TeV gamma rays. The approach to test Lorentz invariance presented here is based on the measurement of extensive air showers induced by cosmic-ray particles in the Earth’s atmosphere. Lorentz-violating processes can have a large impact on the longitudinal shower development of air showers, for example reducing the average atmospheric depth of the shower maximum Xmax. For showers with high primary energies, this change is significantly larger than the average resolution of current air-shower experiments. This can be used to obtain new bounds on this type of Lorentz violation, which can be further improved by taking into account further shower observables.

This work is supported by the Deutsche Forschungsgemeinschaft (DFG).