Complementary particle ID: transition radiation and dE/dx relativistic rise

The Particle Identification (PID) methods using Transition Radiation (TR) and Relativistic Rise (RR) of the ionization losses are discussed as a complementary methods to a RICH technique. The comparative possibilities and limitations of these PID are considered. For the TR the modern high granularity detectors are described (ATLAS Transition Radiation Straw Tracker – TRT – as an example). The comparison is given between widely used Truncated Mean (TM technique) and a new approach based on Time over Threshold (ToT) measurements, which is more preferable due to the simplification of readout electronics and possibility of the fast triggering.