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The current LHCb trigger system consists of a hardware level, which reduces the LHC inelastic collision rate of 30MHz, at which the entire detector is read out. In a second level, implemented in a farm of 20k parallel-processing CPUs, the event rate is reduced to about 5kHz. We review the performance of the LHCb trigger system during Run I of the LHC. Special attention is given to the use of multivariate...
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