Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 42: Neutrino astronomy 2

T 42.7: Talk

Tuesday, March 5, 2024, 17:30–17:45, Geb. 30.23: 6/1

Enhancing neutrino detection efficiency with new triggers at the Pierre Auger Observatory ^* — •Srijan Sehgal for the Pierre-Auger collaboration — Bergische Universität Wuppertal, Wuppertal, Germany

Besides detecting ultra-high-energy cosmic rays, the Pierre Auger Observatory with its large Surface Detector (SD) array offers a remarkable exposure to neutrinos above 10¹⁷eV. Two new SD triggers, Time-over-Threshold-deconvolved (ToTd) and Multiplicity-of-Positive Steps (MoPS), were implemented in 2014 to further increase the detection capability for low energy neutrino-induced air showers.

This contribution aims to present the impact of the new triggers in the context of neutrino search for the zenith angle range of 60^∘ < θ < 75^∘. An optimised neutrino selection, which includes the MoPS and ToTd, is devised and evaluated on simulated neutrino showers. This selection is then further applied to the data sample, and the results are compared to previous neutrino searches performed at the Pierre Auger Observatory.

*Gefördert durch die BMBF Verbundforschung Astroteilchenphysik (Vorhaben 05A23PX1)

Keywords: Cosmogenic neutrinos; Pierre Auger Observatory; Neutrino EAS