Speaker
Description
The Fluorescence Detector (FD) of the Pierre Auger Observatory provides a large exposure for the detection of ultra-high-energy (UHE) upward-going showers (UGS) as suggested by the "anomalous" events reported by ANITA. Recently, strong limits on UGS were obtained using 14 years of FD data, which are in tension with the observations made by ANITA-I and III. Later, ANITA-IV has reported new UGS candidates. Both of these observations motivate the exploration of beyond standard model (BSM) scenarios. In this work, we explore the parameter space to test three classes of BSM models. These unknown BSM particles can interact inside the Earth and produce