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The ATLAS detector at the Large Hadron Collider (LHC) will be exposed to proton-proton collisions at a rate of 40 MHz. This rate needs to be reduced to an output rate of 100-200 Hz, compatible with the foreseen storage and analysis capability. To achieve this while retaining the most interesting physics, the trigger uses novel techniques, such as seeded, step-wise reconstruction and early rejection...
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