A new method for determining the primary energy from the calorimetric energy of showers observed in hybrid mode on a shower-by-shower basis

THE PIERRE AUGER COLLABORATION (AUTOR 434 DE 474); M. TUEROS (COAUTOR); A. G. MARIAZZI

Beijing

Conferencia; International Cosmic Ray Conference 2011; 2011

Institute of High Energy Physics, Chinese Academy of Sciences

: The energy deposit integral can be used for determining the calorimetric energy of air showers observed with fluorescence telescopes. The invisible fraction of the primary energy, averaged over many showers, is typically estimated from Monte Carlo simulations and later added for the reconstruction of the total primary energy. In this contribution we derive a simple parameterization of the invisible energy correction that can be applied to individual events measured with both the fluorescence and the surface detectors. The obtained parameterization is robust with respect to a change of the high energy hadronic interaction model employed in the simulation and has only a very small primary mass dependence, reducing the associated systematic uncertainties of energy reconstruction.