Abstract
The ALICE detector was designed to track and identify particles in a wide transverse momentum range, from ∼ 100 MeV/c to more than 100 GeV/c. The Inner Tracking System (ITS) of the ALICE experiment consists of six cylindrical layers of silicon detectors. Each layer has hermetic structure and it is coaxial with the beam pipe. The ITS covers the pseudorapidity range |η | ≤ 0.9 and the distance from the nominal beam line ranges from 3.9 cm for the innermost layer up to 43 cm for the outermost. The two innermost layers are made of Silicon Pixel Detectors (SPD), the two central layers of Silicon Drift Detectors (SDD) and the two outermost layers of double sided Silicon Strip Detectors (SSD). In this proceeding we present the ITS performance for tracking, interaction vertex reconstruction and particle identification capability. Precise tracking is required to reconstruct and separate the primary vertex and secondary vertices from heavy–flavour meson decays: one example is reported.
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