Studies to enhance the sensitivity to photon primaries including ToTd and MoPS triggers

DOVA, M.T.; WAHLBERG, H.; VERGARA QUISPE, I.D.

Otro; Online Collaboration Meeting; 2020

The ToTd and MoPS triggers are advantageous because they increase the SD acceptance and sensitivity to photon primaries. Based on the use of the variables Xmax and Sb as photon-hadron discriminators, the influence on the calculation of the fraction of photons is studied when stations with the ToTd and MoPS triggers are used in the reconstruction of hybrids events. These triggers are active since their installation in mid-2013, providing more than 7 years of data. However, these data have not been widely used for discriminating primaries at energies above 10^18 eV. The analysis presented in this note explores the increase in the number of events and the improvement of the sensitivity to gamma-hadron separation using the observable Sb when new stations are included. These effects are then shown to be potential elements for improving the sensitivity of a photon search or the setting of stringent upper limits on the fraction of photons in the cosmic ray flux. **Publicado en las notas internas de la Colaboración Auger (GAP2021_035) el 11 de Junio, 2021.