The trigger system of the Pierre Auger Surface Detector: operation, efficiency and stability

D.Allard , E. Armengaud , I. Allekotte , P. Allison , J. Aublin , M. Ave , P. Bauleo , J. Beatty

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T. Beau X. Bertou P. Billoir C. Bonifazi A. Chou J. Chye S. Dagoret-Campagne A. Dorofeev P.L. Ghia M. Gomez Berisso A. Gorgi J.C. Hamilton J. Harton R. Knapik C. Lachaud I. Lhenry-Yvon A. Letessier-Selvon J. Matthews C. Medina R. Meyhandan G. Navarra D. Nitz E.Parizot B. Revenu Z. Szadkowski T. Yamamoto (for the Pierre Auger Collaboration)

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keywords triggersingleaugerdetectorefficiencylevelpierrereal

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The trigger system of the Surface Detector (SD) of the Pierre Auger Observatory is described, from the identification of candidate showers ($E>1$ EeV) at the level of a single station, among a huge background (mainly single muons), up to the selection of real events and the rejection of random coincidences at a higher central trigger level (including the reconstruction accuracy). Efficiency of a single station trigger is evaluated using real data , and the high performance of event selection hierarchy will be demonstrated.

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The trigger system of the Pierre Auger Surface Detector: operation, efficiency and stability

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