Congress detail

Authors: P. Hansen; J. Alvarez-Muñiz; R.A. Vazquez; L.C. Uzal; P.M. Granitto.

Resumen: We consider the case of a surface detector array with capabilities to measure the muonic component of the shower as well as the depth of the electromagnetic shower maximum Xmax with an almost 100% duty cycle. We address its potential to discriminate cosmic primaries on an event-by-event basis. In particular we study to which extent these new detector capabilities may help improving the separation of primary proton and iron-induced extensive air showers. We obtain the discrimination power when several composition-sensitive observables are (a) taken individually, and (b) combined in a linear discriminant analysis. The depth of shower maximum gives the best separation as an individual parameter as long as its measurement resolution is small (below ∼ 50 g/cm2), with a moderate improvement when other observables, such as the number of muons at ground, are combined in a linear discriminant analysis. However, if the measurement of Xmax degrades significantly, above about 50 g/cm2, measuring the number of muons with good accuracy and combining it with other observables, becomes crucial to achieve an event-by-event discrimination with large identification efficiency.

Meeting type: Encuentro.

Production: Linear discriminant analysis of ultra-high energy cosmic ray composition: the importance of the detector resolution.

Scientific meeting: Auger Collaboration Meeting March 2014.

Meeting place: Malargüe, Mendoza.

Organizing Institution: Pierre Auger Observatory.

It's published?: No

Meeting month: 3

Year: 2014.