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18 <FONT FACE="Albany, sans-serif"><FONT SIZE=4>============================================================================</FONT></FONT></P>
19 <P STYLE="margin-top: 0.42cm; margin-bottom: 0.5cm; page-break-after: avoid">
20 <FONT FACE="Albany, sans-serif"><FONT SIZE=4>Description of ALICE ITS
21 Code (Rev. 0.2; May, 5<SUP>th</SUP> 2008; M. Masera)</FONT></FONT></P>
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23 <FONT FACE="Albany, sans-serif"><FONT SIZE=4>============================================================================</FONT></FONT></P>
24 <P STYLE="margin-bottom: 0cm"><STRONG><FONT SIZE=4 STYLE="font-size: 16pt">Contents</FONT></STRONG></P>
25 <P STYLE="margin-bottom: 0cm"><BR>
27 <P STYLE="margin-bottom: 0cm"><A NAME="punto 1"></A>The goal of this
28 document is to give a concise description of the ITS software. For
29 more general information the reader is referred to the ALICE <A HREF="http://aliceinfo.cern.ch/Offline/AliRoot/Manual.html">offline
30 documentation</A>.</P>
31 <P STYLE="margin-bottom: 0cm">The reader is assumed to have a basic
32 knowledge of AliRoot and of the Inner Tracking System Detector.</P>
33 <P STYLE="margin-bottom: 0cm">The documentation is organized in the
34 following sections:</P>
36 <LI><P STYLE="margin-bottom: 0cm"><B>SPD. </B><SPAN STYLE="font-weight: medium">This
37 section</SPAN><B> </B>gives information on SPD simulation, local
38 reconstruction, calibration and specific run types. <FONT COLOR="#dc2300">To
39 be written</FONT>.</P>
40 <LI><P STYLE="margin-bottom: 0cm"><B><A HREF="doc_sdd.html">SDD</A>.</B>
41 As above. Author: F. Prino.</P>
42 <LI><P STYLE="margin-bottom: 0cm"><B>SSD.</B> As above. <FONT COLOR="#dc2300">To
43 be written</FONT>.</P>
44 <LI><P STYLE="margin-bottom: 0cm"><B><A HREF="doc_itsgeo.html">Geometry</A>.</B> In this section a
45 short description of the implementation of the ITS geometry used
46 for simulation and reconstruction is given.</P>
47 <LI><P STYLE="margin-bottom: 0cm"><B>ITS tracking.</B> This section
48 provides information on the trackers used to prolong track
49 candidates from the TPC (AliITStrackerMI class) and to find and fit
50 tracks with the ITS alone (AliITStrackerSA). Information on cosmic
51 muon reconstruction is also provided. <FONT COLOR="#dc2300">To be
54 <LI><P STYLE="margin-bottom: 0cm"><B>Primary vertex measurement.</B>
55 This section describes the vertexers (AliITSVertexerZ and
56 AliITSVertexer3D) used to provide a first estimete on the postition
57 of the primary vertex position based on the local reconstruction of
58 the 2 pixel layers. Author: M. Masera. <FONT COLOR="#dc2300">To be
61 <P STYLE="margin-bottom: 0cm"><BR>
63 <P STYLE="margin-bottom: 0cm"><BR>