Reduced violations

[u/mrichter/AliRoot.git] / MUON / README

diff --git a/MUON/README b/MUON/README
index f5020e39d1e3c4dc5c6d48017fdda7670e842862..03e7a65be0a9bd69a90b198f2d1c94f30ee69b91 100644 (file)
--- a/MUON/README
+++ b/MUON/README
@@ -89,6 +89,10 @@ gSystem->Load("$ALICE_ROOT/MUON/MUONTracker_C.so")
 Output in MUON.Tracks.root using the new IO 
 as a TClonesArray of AliMUONTrack
 
+Note1.In the actual version (dec-03) the following data 
+members  of ALiMUONTrack:  fgFitter, fEventReconstructor, 
+and fTrackHitsPtr are not saved in the MUON.Track.root file
+
 ============================================================
  How to run MUONCheck macro
 ============================================================
@@ -129,7 +133,7 @@ G3GUI()
 ============================================================
  How to run MUONdisplay
 ============================================================
-Frist you need to perfomr a full simulation: 
+First you need to perform a full simulation: 
 generation, digitalisation and clusterisation
 .L $ALICE_ROOT/MUON/MUONdisplay.C
 MUONdisplay(0,"galice.root")
@@ -145,6 +149,24 @@ the gas mixture medium  is then defined in the galice.cuts file
 in the data directory. In particular ILOSS parameter MUST be
 equal unity (1) in order simulate a realistic energy loss
 distribution (mean value and fluctuations) in the active gas.
+
+============================================================
+ Tracking of particle in the magnetic field
+============================================================
+GEANT has two ways for tracking charged particles in the 
+magnetic field: HELIX et RKUTA.
+HELIX is faster and works well if the gradient of magnetic 
+field is small. 
+For MUON, HELIX is a not a good approximation and we must 
+use RKUTA to get the optimal mass resolution of the 
+spectrometer. The choice of HELIX or RKUTA is done in the
+config file when the magnetic field is defined:
+  AliMagFMaps* field = new AliMagFMaps("Maps","Maps", TRACKING, FACTOR, MAXB, AliMagFMaps::k4kG);
+  gAlice->SetField(field);
+TRACKING must be 1 for RKUTA and 2 for HELIX (the default value for aliroot is 2 (HELIX))
+FACTOR allows you to set the magnetic field to 0, just putting FACTOR=0. Default value is 1.
+MAXB is the maximum magnetic field which is 10.T
+
 ===========================================================
  Still working ..............
 ===========================================================