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Several terms used throughout the Physics Reference Manual have specific
meaning within Geant4, but are not well-defined in general usage. The
definitions of these terms are given here.
- process - a C++ class which describes how and when a specific
kind of physical interaction takes place along a
particle track. A given particle type typically
has several processes assigned to it.
Occaisionally ``process'' refers to the interaction
which the process class describes.
- model - a C++ class whose methods implement the details of an
interaction, such as its kinematics. One or more
models may be assigned to each process. In sections
discussing the theory of an interaction, ``model'' may
refer to the formulae or parameterization on which
the model class is based.
- Geant3 - a physics simulation tool written in Fortran,
and the predecessor of Geant4. Although many
references are made to Geant3, no knowledge
of it is required to understand this manual.