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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