Adding READMEcalign.txt

(Javier)

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+// $Id$
+
+/*! 
+
+\page README_calign Offline Calibration and Alignment
+ 
+\section calign_s1 Offline monitoring of the Alignment and Calibration
+
+The macro MUONClusterInfo.C reads the ESDs or RecPoints and creates a tree of 
+AliMUONClusterInfo objects which can be conveniently used to plot track to 
+cluster residuals, cluster and pads properties.
+
+Usage:
+<pre>
+root [0] .L $ALICE_ROOT/MUON/MUONClusterInfo.C+
+root [1] MUONClusterInfo(nevents, esdFileName, inFileName, outFileName); 
+</pre>
+
+ 1) <code> if ( esdFileName != "" ) </code>: 
+
+ Loop over ESD event and fill AliMUONClusterInfo object with cluster + 
+ corresponding track parameters.
+
+ 2) <code> if ( inFileName != "" ) </code>:
+  
+ Loop over RecPoints and fill AliMUONClusterInfo object with cluster not 
+ attached to a track;
+
+ 3) Write results in a new root file.
+
+\section calign_s2 How to run offline calibration and alignment tasks
+
+AliMUONAlignmentTask:
+ 
+It is an AliAnalysisTask to align the MUON spectrometer. The Task reads 
+as input ESDs and feeds the MUONTracks to AliMUONAlignment. The alignment 
+itself is performed by AliMillepede. A OCDB entry is written with the 
+alignment parameters. A list of graph are written to monitor the alignment 
+parameters. 
+
+AliMUONReAlignTask:
+
+It is an AliAnalysisTask to realign the MUON spectrometer. The Task reads 
+as input ESDs moves the clusters of a MUONTrack acoording to the re aligned 
+geometry taken from a misalignment file in the OCDB and refit the track. 
+Then it produces a AliMUONClusterInfo object for each cluster. The output is 
+a TTree of AliMUONClusterInfo.
+
+AliMUONChamberCalibrationTask:
+
+It is a AliAnalysisTaskSE to recalibrate the MUON spectrometers. The output is 
+a TTree of AliMUONClusterInfo. 
+
+
+The AliMUON*Task are designed to run in an analyis train of the Analysis 
+Framework. The macros AddTaskMuon*.C can be used to add the task to an 
+analysis train. An usage example based on the new standard AnalysisTrainNew.C 
+will be provided soon. 
+
+
+This chapter is defined in the READMEcalign.txt file.
+
+*/