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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...
To make the best possible use of the higher luminosity provided by the upgraded HERA collider, the H1 collaboration has built the Fast Track Trigger (FTT). It is integrated in the first three levels (L1-L3) of the H1 trigger scheme and provides enhanced selectivity for events with charged particles. The FTT allows the reconstruction of tracks in the central drift chambers down to 100 MeV. Within the...
The H1 experiment at the electron-proton collider HERA has built a new fast track trigger to increase the selectivity for exclusive final states, especially those with heavy quarks, and to cope with the higher background rates after the HERA luminosity upgrade. Hits measured in the central jet chamber of H1 are combined to track segments by performing 5 middot 1012 mask comparisons per second using...
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