Trigger performance of the ALICE Silicon Pixel Detector

The ALICE Silicon Pixel Detector (SPD) forms the two innermost layers of the ALICE Inner Tracking System (ITS). The unique feature of the SPD among the vertex detectors of LHC experiments is the prompt trigger capability, called Fast-OR, which allows it to contribute to the experimental first level (L0) trigger decision. The SPD has been participating in data taking since the first proton-proton collisions providing the trigger for minimum bias event selection. A first evaluation of Fast-OR efficiency is presented