Transverse momentum spectra of hadrons identified with the ALICE Inner Tracking System
The Inner Tracking System (ITS) is the ALICE detector closest to the beam axis. It is composed of six layers of silicon detectors: two innermost layers of Silicon Pixel Detectors (SPD), two intermediate layers of Silicon Drift Detectors (SDD) and two outermost layers of Silicon Strip Detectors (SSD). The ITS can be used as a standalone tracker in order to recover tracks that are not reconstructed by the Time Projection Chamber (TPC) and to reconstruct low momentum particles with pt down to 100 MeV/c. Particle identification in the ITS is performed by measuring the energyloss signal in the SDD and SSD layers. The ITS allows one to extend the charged particle identification capability in the ALICE central rapidity region at low pt: it is possible to separate π/K in the range 100 MeV/c < pt < 500 MeV/c and K/p in the range 200 MeV/c < pt < 800 MeV/c.