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Advanced Particle Identification

A major improvement of the spectrometer in terms of granularity and particle identification capability was achieved by installation of new shielded timing Resistive Plate Chamber (RPC) time-of-flight detectors at low polar angles (between 18° and 45°). In beam measurements show an average efficiency of 99%, a time resolution of 73 ps together with an average longitudinal position resolution of 7.7 mm. An efficient and accurate track reconstruction in a high track density environment of Au+Au collisions allows for an excellent particle identification via the momentum versus velocity correlation.