Reconstruction performance of simulated events with the SD-433: a WCD+UMD analysis

F. SANCHEZ (VER ADJUNTO)

Otro; Publicacion interna Colaboracion Auger (GAP Note); 2019

The transition from Galactic to extragalactic cosmic rays is expected to be observed atenergies between few tens and few hundred PeV. This region of the spectrum is accessibleby the SD-433, the most dense SD array in Auger. Currently, this array is composed by 16stations separated by 433 m with the foreseen addition of three new ones, completing twocrowns around the SD station 1764, which is equipped with a 60 m 2 Underground MuonDetector station. In this note, we assess the performance of the current reconstructionprocedure using simulated events. We show that a core position resolution of 21 m, anangular resolution of 0.7deg and an energy resolution of 13% can be attained at 0.1 EeV,making the SD-433 an array fitted for composition and spectrum studies. By classifyingevents between muon-poor and muon-rich employing the observable M b , we show thatthe bias in the reconstructed energy with the SD-433 is proportional to the high-energymuon content of the air showers.