Example HepMCEx02

This example demonstrates how to interface primary particles in Geant4 with various event generators via the HepMC Monte Carlo event interface. This is another example having the same generator action as HepMCEx01, but much simpler user control.

Primary Generator

H02PrimaryGeneratorAction has HepMCG4Interface as the generator. There are two types of generators provided as samples. One generator reads primary information from a HepMC Ascii file (data/example_MyPythia.dat). The other one generates primaries directly invoking PYTHIA routines in every event.

Geometry

A simplified collider-type geometry, which consists of

• endcap calorimeter (a set of tubes filled with lead),
• barrel calorimeter (tube filled with lead),
• barrel muon detector (8 sets of plates filled with Ar),
• endcap muon detecror, (a set of tubes filled with Ar) and
• uniform magnetic field along the z axis of 3 Tesla at the central region.

Physics List

FTFP_BERT predefined physics list

User actions

All particles except muons are killed in the calorimeter section.

Installation

See Category "eventgenerator/HepMC" how to build this example.

Execution

% HepMCEx02 hepmc_pygen.in