The LHCb experiment intends to perform highly accurate measurements on CP-violating processes and rare decays of B-mesons at the Large Hadron Collider. The ratio between the expected p-p inelastic cross-section (about 100 mb) and the b-b cross-section (0.5 mb) demands for a very robust and efficient trigger system. In this paper the two trigger levels (Level-0 and High Level Trigger) fore seen for the experiment are described and their main performance analysed. The expected annual yields of some of the most interesting B-decay channels are also summarised.
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