Abstract
LHCb is an experiment being constructed at CERN's Large Hadron Collider accelerator for the purpose of studying precisely the charge and parity violation parameters in the B-B meson system. Triggering poses special problems since the interesting events containing B-mesons are immersed in a large background of inelastic p-p reactions. Therefore, a four-level triggering scheme (Level-0 to Level-3) has been implemented. Full event building is performed between Level-1 and Level-2. Powerful embedded processors, used in modern intelligent network interface cards, are attractive to use to handle the event-building protocol in the high-speed data-acquisition system. The implementation of an event-building algorithm developed for a specific gigabit Ethernet network interface controller is presented, and results from performance measurements are discussed.
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