Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/69072
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Type: Journal article
Title: The Lateral Trigger Probability function for the Ultra-High Energy Cosmic Ray showers detected by the Pierre Auger Observatory
Author: Barber, K.
Bellido Caceres, J.
Clay, R.
Cooper, M.
Dawson, B.
Herve, A.
Holmes, V.
Sorokin, J.
Wahrlich, P.
Whelan, B.
Winnick, M.
Citation: Astroparticle Physics, 2011; 35(5):266-276
Publisher: Elsevier Science BV
Issue Date: 2011
ISSN: 0927-6505
1873-2852
Organisation: Pierre Auger Collaboration
Statement of
Responsibility: 
The Pierre Auger Collaboration... P. Abreu... K. B. Barber... J. A. Bellido... R. W. Clay... M. J. Cooper... B. R. Dawson... A. E. Herve... V. C. Holmes... J. S. Sorokin... P. S. Wahrlich... M. G. Winnick... et al.
Abstract: In this paper we introduce the concept of Lateral Trigger Probability (LTP) function, i.e., the probability for an Extensive Air Shower (EAS) to trigger an individual detector of a ground based array as a function of distance to the shower axis, taking into account energy, mass and direction of the primary cosmic ray. We apply this concept to the surface array of the Pierre Auger Observatory consisting of a 1.5 km spaced grid of about 1600 water Cherenkov stations. Using Monte Carlo simulations of ultra-high energy showers the LTP functions are derived for energies in the range between 1017 and 1019 eV and zenith angles up to 65°. A parametrization combining a step function with an exponential is found to reproduce them very well in the considered range of energies and zenith angles. The LTP functions can also be obtained from data using events simultaneously observed by the fluorescence and the surface detector of the Pierre Auger Observatory (hybrid events). We validate the Monte Carlo results showing how LTP functions from data are in good agreement with simulations. © 2011 Published by Elsevier B.V.
Keywords: Extensive Air Showers
Trigger performance
Surface detector
Hybrid detector
Rights: Copyright 2011 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.astropartphys.2011.08.001
Grant ID: ARC
Description (link): http://www.journals.elsevier.com/astroparticle-physics/
Published version: http://dx.doi.org/10.1016/j.astropartphys.2011.08.001
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