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<FONT FACE="Albany, sans-serif"><FONT SIZE=4>============================================================================</FONT></FONT></P>
<P STYLE="margin-top: 0.42cm; margin-bottom: 0.5cm; page-break-after: avoid">
<FONT FACE="Albany, sans-serif"><FONT SIZE=4>Description of ALICE ITS
-Code (Rev. 0.1 – April, 30<SUP>th</SUP> 2008 – M. Masera)</FONT></FONT></P>
+Code (Rev. 0.3 — May, 16<SUP>th</SUP> 2008 — M. Masera)</FONT></FONT></P>
<P STYLE="margin-top: 0.42cm; margin-bottom: 0.5cm; page-break-after: avoid">
<FONT FACE="Albany, sans-serif"><FONT SIZE=4>============================================================================</FONT></FONT></P>
<P STYLE="margin-bottom: 0cm"><STRONG><FONT SIZE=4 STYLE="font-size: 16pt">Contents</FONT></STRONG></P>
<P STYLE="margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-bottom: 0cm"><A NAME="punto 1"></A>The goal of this
-document is to give a concise description of the ITS software. For
+document is to give a concise description of the ITS software. For
more general information the reader is referred to the ALICE <A HREF="http://aliceinfo.cern.ch/Offline/AliRoot/Manual.html">offline
documentation</A>.</P>
<P STYLE="margin-bottom: 0cm">The reader is assumed to have a basic
<P STYLE="margin-bottom: 0cm">The documentation is organized in the
following sections:</P>
<OL>
- <LI><P STYLE="margin-bottom: 0cm"><B>SPD. </B><SPAN STYLE="font-weight: medium">This
- section</SPAN><B> </B>gives information on SPD simulation, local
- reconstruction, calibration and specific run types. <FONT COLOR="#dc2300">To
- be written</FONT>.</P>
+ <LI><P STYLE="margin-bottom: 0cm"><B><A HREF="doc_spd.html">SPD</A>.
+ </B>This section gives information on SPD simulation, local
+ reconstruction, calibration and specific run types. Author: D. Elia.</P>
<LI><P STYLE="margin-bottom: 0cm"><B><A HREF="doc_sdd.html">SDD</A>.</B>
- As above. Author: F. Prino.</P>
- <LI><P STYLE="margin-bottom: 0cm"><B>SSD.</B> As above. <FONT COLOR="#dc2300">To
- be written</FONT>.</P>
- <LI><P STYLE="margin-bottom: 0cm"><B>Geometry.</B> In this section a
- short description of the implementation of the ITS geometry used
- for simulation and reconstruction is given. <FONT COLOR="#dc2300">To
- be written</FONT>.</P>
+ As above. Author: F. Prino.</P>
+ <LI><P STYLE="margin-bottom: 0cm"><B><A HREF="doc_ssd.html">SSD</A>.</B> As above. Author: E. Fragiacomo.</P>
+ <LI><P STYLE="margin-bottom: 0cm"><B><A HREF="doc_itsgeo.html">Geometry</A>.</B>
+ In this section a short description of the implementation of the ITS
+ geometry used for simulation and reconstruction is given.</P>
<LI><P STYLE="margin-bottom: 0cm"><B>ITS tracking.</B> This section
provides information on the trackers used to prolong track
candidates from the TPC (AliITStrackerMI class) and to find and fit
written</FONT>.
</P>
<LI><P STYLE="margin-bottom: 0cm"><B>Primary vertex measurement.</B>
- This section describes the vertexers (AliITSVertexerZ and
+ 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. <FONT COLOR="#dc2300">To be
written</FONT>.</P>
+ <LI><P STYLE="margin-bottom: 0cm"><B>Charged particle multiplicity.
+ </B><SPAN STYLE="font-weight: medium">(Author: T. Virgili)</SPAN><B>
+ </B> The charged particle multiplicity is determined with the
+ <B>AliITSMultReconstructor</B> class, which measures the number of
+ clusters and tracklets.<BR>A <I>tracklet </I>consists of two ITS
+ clusters, one in the first pixel layer and one in the second. The
+ clusters are associates if differences in <I>Phi </I>(azimuth) and
+ <I>Zeta</I> (longitudinal coordinate) are inside a fiducial region,
+ defined by appropriate cuts These cuts depend on the interacting
+ system (p-p or Pb-Pb) and can be set via <B>SetPhiWindow </B>and
+ <B>SetZetaWindow methods. </B>In case of multiple candidates, the
+ one with minimal azimuthal difference is chosen. <BR>It is also
+ possible to control if two clusters in layer 2 can be associated to
+ the same cluster in layer 1 or not. This is defined by means of the
+ <B>AssociationChoice</B> (TRUE means double associations exluded;
+ default = TRUE) method.<BR>The method <B>GetNTracklets</B> returns
+ the number of tracklets and the relative information: <B>theta</B>
+ and <B>phi </B>of the tracklet (as measured by layer 1), <B>Delta
+ phi</B> (phi difference between layer 1 and 2), the label of the
+ particle(s) producing the clusters.<BR>The unassociated clusters can
+ be retrieved by the method <B>GetNSingleClusters</B>.<BR><BR>
+ </P>
</OL>
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</P>
<P STYLE="margin-bottom: 0cm"><BR>
</P>
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