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Description of ALICE ITS Code (Rev. 0.2; May, 5^th 2008; M. Masera)

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Contents

The goal of this document is to give a concise description of the ITS software. For more general information the reader is referred to the ALICE offline documentation.

The reader is assumed to have a basic knowledge of AliRoot and of the Inner Tracking System Detector.

The documentation is organized in the following sections:

1. SPD. This section gives information on SPD simulation, local reconstruction, calibration and specific run types. To be written.

2. SDD. As above. Author: F. Prino.

3. SSD. As above. To be written.

4. Geometry. In this section a short description of the implementation of the ITS geometry used for simulation and reconstruction is given.

5. ITS tracking. This section provides information on the trackers used to prolong track candidates from the TPC (AliITStrackerMI class) and to find and fit tracks with the ITS alone (AliITStrackerSA). Information on cosmic muon reconstruction is also provided. To be written.

6. Primary vertex measurement. This section describes the vertexers (AliITSVertexerZ and AliITSVertexer3D) used to provide a first estimete on the postition of the primary vertex position based on the local reconstruction of the 2 pixel layers. Author: M. Masera. To be written.