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17 | <P STYLE="margin-top: 0.42cm; margin-bottom: 0.5cm; page-break-after: avoid"> | |
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 | |
d6882b38 | 21 | Code (Rev. 0.3 — May, 16<SUP>th</SUP> 2008 — M. Masera)</FONT></FONT></P> |
2627be86 | 22 | <P STYLE="margin-top: 0.42cm; margin-bottom: 0.5cm; page-break-after: avoid"> |
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> | |
26 | </P> | |
27 | <P STYLE="margin-bottom: 0cm"><A NAME="punto 1"></A>The goal of this | |
d6882b38 | 28 | document is to give a concise description of the ITS software. For |
2627be86 | 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> | |
35 | <OL> | |
d6882b38 | 36 | <LI><P STYLE="margin-bottom: 0cm"><B><A HREF="doc_spd.html">SPD</A>. |
37 | </B>This section gives information on SPD simulation, local | |
38 | reconstruction, calibration and specific run types. Author: D. Elia.</P> | |
2627be86 | 39 | <LI><P STYLE="margin-bottom: 0cm"><B><A HREF="doc_sdd.html">SDD</A>.</B> |
d6882b38 | 40 | As above. Author: F. Prino.</P> |
41 | <LI><P STYLE="margin-bottom: 0cm"><B><A HREF="doc_ssd.html">SSD</A>.</B> As above. Author: E. Fragiacomo.</P> | |
42 | <LI><P STYLE="margin-bottom: 0cm"><B><A HREF="doc_itsgeo.html">Geometry</A>.</B> | |
43 | In this section a short description of the implementation of the ITS | |
44 | geometry used for simulation and reconstruction is given.</P> | |
2627be86 | 45 | <LI><P STYLE="margin-bottom: 0cm"><B>ITS tracking.</B> This section |
46 | provides information on the trackers used to prolong track | |
47 | candidates from the TPC (AliITStrackerMI class) and to find and fit | |
48 | tracks with the ITS alone (AliITStrackerSA). Information on cosmic | |
49 | muon reconstruction is also provided. <FONT COLOR="#dc2300">To be | |
50 | written</FONT>. | |
51 | </P> | |
52 | <LI><P STYLE="margin-bottom: 0cm"><B>Primary vertex measurement.</B> | |
d6882b38 | 53 | This section describes the vertexers (AliITSVertexerZ and |
2627be86 | 54 | AliITSVertexer3D) used to provide a first estimete on the postition |
55 | of the primary vertex position based on the local reconstruction of | |
56 | the 2 pixel layers. Author: M. Masera. <FONT COLOR="#dc2300">To be | |
57 | written</FONT>.</P> | |
d6882b38 | 58 | <LI><P STYLE="margin-bottom: 0cm"><B>Charged particle multiplicity. |
59 | </B><SPAN STYLE="font-weight: medium">(Author: T. Virgili)</SPAN><B> | |
60 | </B> The charged particle multiplicity is determined with the | |
61 | <B>AliITSMultReconstructor</B> class, which measures the number of | |
62 | clusters and tracklets.<BR>A <I>tracklet </I>consists of two ITS | |
63 | clusters, one in the first pixel layer and one in the second. The | |
64 | clusters are associates if differences in <I>Phi </I>(azimuth) and | |
65 | <I>Zeta</I> (longitudinal coordinate) are inside a fiducial region, | |
66 | defined by appropriate cuts These cuts depend on the interacting | |
67 | system (p-p or Pb-Pb) and can be set via <B>SetPhiWindow </B>and | |
68 | <B>SetZetaWindow methods. </B>In case of multiple candidates, the | |
69 | one with minimal azimuthal difference is chosen. <BR>It is also | |
70 | possible to control if two clusters in layer 2 can be associated to | |
71 | the same cluster in layer 1 or not. This is defined by means of the | |
72 | <B>AssociationChoice</B> (TRUE means double associations exluded; | |
73 | default = TRUE) method.<BR>The method <B>GetNTracklets</B> returns | |
74 | the number of tracklets and the relative information: <B>theta</B> | |
75 | and <B>phi </B>of the tracklet (as measured by layer 1), <B>Delta | |
76 | phi</B> (phi difference between layer 1 and 2), the label of the | |
77 | particle(s) producing the clusters.<BR>The unassociated clusters can | |
78 | be retrieved by the method <B>GetNSingleClusters</B>.<BR><BR> | |
79 | </P> | |
2627be86 | 80 | </OL> |
81 | <P STYLE="margin-bottom: 0cm"><BR> | |
82 | </P> | |
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