SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 70: Cosmic Ray III
T 70.6: Vortrag
Mittwoch, 22. März 2023, 17:05–17:20, POT/0013
A new bound on Lorentz violation based on the absence of vacuum Cherenkov radiation in ultra-high energy air showers — •Fabian Duenkel, Marcus Niechciol, and Markus Risse — Center for Particle Physics Siegen, Experimentelle Astroteilchenphysik, Universität Siegen
In extensive air showers induced by ultra-high energy (UHE) cosmic rays, secondary particles are produced with energies far above those accessible by other means. These extreme energies can be used to search for new physics. We study the effects of isotropic, nonbirefringent Lorentz violation in the photon sector. In case of a photon velocity smaller than the maximum attainable velocity of standard Dirac fermions, vacuum Cherenkov radiation becomes possible. Implementing this Lorentz-violating effect in air shower simulations, a significant reduction of the calculated average atmospheric depth of the shower maximum <Xmax> is obtained. Based on <Xmax> and its shower-to-shower fluctuations σ(Xmax), we present a new bound on Lorentz violation sensitive to vacuum Cherenkov radiation from fundamental particles (electrons and positrons) in air showers.
This work is supported by the Deutsche Forschungsgemeinschaft (DFG).