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

DIEGO RAVIGNANI; ALEJANDRO ALMELA; ALBERTO ETCHEGOYEN; BEATRIZ GARCIA; AGUSTÍN LUCERO; MATIAS PERLIN; CHRISTIAN SARMIENTO CANO; GAIA SILLI; MARKUS ROTH; MARIA BELEN ANDRADA; JUAN MANUEL FIGUEIRA; FLAVIA GESUALDI; DIEGO MELO; MANUEL PLATINO; DAVID SCHMIDT; ALVARO TABOADA; NICOLAS GONZALEZ; FEDERICO SANCHEZ; ANA BOTTI; ALAN FUSTER; MATIAS HAMPEL; SARAH MULLER; MATIAS RONCORONI; SCORNAVACHE MARINA; BRIAN WUNDHEILER

Otro; Pierre Auger Collaboration; 2019

The transition from Galactic to extragalactic cosmic rays is expected to be observed at energies between few tens and few hundred PeV. This region of the spectrum is accessible by the SD-433, the most dense SD array in Auger. Currently, this array is composed by 16 stations separated by 433 m with the foreseen addition of three new ones, completing two crowns around the SD station 1764, which is equipped with a 60 m2 Underground Muon Detector station. In this note, we assess the performance of the current reconstruction procedure using simulated events. We show that a core position resolution of 21 m, an angular resolution of 0.7◦ and an energy resolution of 13% can be attained at 1017 eV, making the SD-433 an array fitted for composition and spectrum studies. By classifying events between muon-poor and muon-rich employing the observable Mb, we show that the bias in the reconstructed energy with the SD-433 is proportional to the high-energy muon content of the air showers.