Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 13: Cosmic Rays I

T 13.4: Talk

Monday, March 15, 2021, 16:50–17:05, Tm

Correction of the asymmetry of the signal measured by the surface detector of the Pierre Auger Observatory — •Quentin Luce for the Pierre Auger collaboration — Karlsruhe Institute für Technologie, Karslruhe, Germany

For the last fifteen years, the Surface Detector (SD) of the Pierre Auger Observatory is continuously recording the footprint of Extensive Air Showers (EAS) initiated by Ultra-High Energy Cosmic-Rays at ground level. To reconstruct most accurately as possible the lateral profile of the EAS recorded, the asymmetry of the signal measured by the water-Cherenkov detectors has to be corrected. The correction applied is first derived from simulated data sets, from which the true arrival direction and thus the position of each detectors in the shower-plane is known. In addition to the SD, 27 fluorescence telescopes are deployed looking over the SD. Thus a sub-set of events can be reconstructed by two independent procedures. Thanks to this hybrid design, the use of simulated data sets is complemented by a study of hybrid events to optimize the correction, specially with an addition of a scaling factor of the muonic component of the EAS. This addition takes into account the discrepancies between measured and simulated data on the number of muons published in the litterature.