ITEDA   22747
INSTITUTO DE TECNOLOGIA EN DETECCION Y ASTROPARTICULAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Improving the universality recosntruction with independent measurements by water-Cherenkov detectors and muon counters
Autor/es:
M. JOSEBACHUILI; M. AVE; M. ROTH ; D. MELO; F. SÁNCHEZ; A. ETCHEGOYEN
Lugar:
La Haya
Reunión:
Conferencia; The 34th International Cosmic Ray Conference; 2015
Institución organizadora:
The International Cosmic Ray Conference
Resumen:
Prior work has demostrated that particle showers produced by cosmic rays can be well described by a universal model. The secondary particles at the observation level can be modelled with four components: the well known electromagnetic and muonic components, the contribution from the electromagnetic halo of muons, and the electromagnetic particles originating from pion decays close to ground, which closely follow the development of the muonic component. Due to the large quantity of particles produced, these distributions can be described with three parameters: the total energy E of the primary, the depth of maximum shower developement Xmax, and the muon content Rμ . E and Xmax are primarily governed by the pure electromagnetic component, whereas the muon scale (Rμ) depends on primary particle composition and affects the other three components. Although reconstruction of these macroscopic parameters is already viable with a single detector type (e.g. an array of water-Cherenkov detectors), large correlations between the quantities are apparent and must be taken into account when interpreting the data. Additional muon counters allow for an independent measurement of the muon number at ground level, which aids in overcoming degeneracy and reduces systematic uncertainties due to the hadronic interaction model used. The procedure is exemplified for the case of the Pierre Auger Observatory by parameterizing the signals produced by particles in the array of water-Cherenkov detectors paired with underground muon counters. The universal parameterizations allow us to estimate E and Rμ independently on an event-by-event basis. The results of incorporating muon detectors demonstrates e.g. the possibility of an unbiased energy estimation based only on a universal description of showers.