Import Geant4 4.1.0 source tree

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+$Id: README,v 1.1 2002/03/05 15:22:08 gcosmo Exp $
+-------------------------------------------------------------------
+
+     =========================================================
+     Geant4 - an Object-Oriented Toolkit for Simulation in HEP
+     =========================================================
+
+                            ParN04
+                            ------
+
+ ParN04 has a simplified collider detector geometry.
+ This example demonstrates the following features.
+ [ Read 000README for a description of how to run it in parallel. ]
+
+1. PYTHIA primary events.
+
+ ExN04PrimaryGeneratorAction has G4HEPEvtInterface as the generator.
+G4HEPEvtInterface accesses to "pythia_event.data", which contains three
+events of Higgs generation produced by PYTHIA. "pythia_main.f" is an
+example FORTRAN code of PYTHIA for generating this event sample.
+
+2. Readout geometry
+
+ ExN04DetectorConstruction defines a simplified collider detecor
+geometry, tracker made of cylindrical tubes, calorimeter made of
+cylindrical tubes, and muon trackers made of planes.
+ Cylindrical calorimeter is made of tubes of lead and scintirator
+without cut in phi nor z direction. Energy deposition in scintirator
+is accumurated by ExN04CalorimeterSD sensitive detector, which has
+a readout geometry to find the phi-z cell.
+
+3. Full set of "ordinary" physics processes
+
+ ExN04PhysicsList defines almost all of leptons and hadrons which
+Geant4 has dedicated classes for. Also almost all physics processes 
+Geant4 has are defined.
+
+4. Event filtering by the stacking mechanism.
+
+ Higgs events in "pythia_event.data" have two lepton pairs produced
+by the Higgs decay via Z0. At the first stage of each event, only the
+primary muons are tracked without tracking secondaries. then the number
+of hits on the muon trackers are examined. At the next stage, only
+the primary charged particles are tracked only inside the barrel
+tracking area and the isolation of the primary muons are examined.
+At the third stage, all particles in the RoI (Region of Interest) along
+the isolated muons are tracked. All these examinations are applied in
+ExN04StackingAction.