Estimate of the invisible energy of inclined showers observed with surface detectors of the Pierre Auger Observatory

G. RODRIGUEZ; A. G. MARIAZZI; V. VERZI; M. TUEROS

Auger Gap Note

The Pierre Auger Collaboration

Año: 2016 vol. 126 p. 1 - 10

0395-2037

The determination of the primary energy of extensive air showers usingthe fluorescence technique requires an estimation of the energy carriedaway by particles that do not deposit all their energy in the atmosphere.This estimation is typically made using Monte Carlo simulations and thusdepends on the assumed primary particle mass and on model predictionsfor neutrino and muon production. In this work we present a new methodto obtain the invisible energy directly from inclined events from the surface detectors of the Pierre Auger Observatory. The method is based on the correlation of the invisible energy with the muon content of air showers and it is robust in respect to changes in the high energy hadronic interaction model. An event-by-event estimate of the invisible energy was performed for the events used in the energy calibration of the N 19 method of the Pierre Auger Observatory. A parameterization of the dependence of the invisible energy with the measured calorimetric energy is given based on these data.