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Scope of This Manual

The Physics Reference Manual provides detailed explanations of the physics implemented in the Geant4 toolkit. The manual's purpose is threefold:

to present the theoretical formulation, model, or parameterization of the physics interactions included in Geant4,
to describe the probability of the occurrence of an interaction and the sampling mechanisms required to simulate it, and
to serve as a reference for toolkit users and developers who wish to consult the underlying physics of an interaction.

This manual does not discuss code implementation or how to use the implemented physics interactions in a simulation. These topics are discussed in the User's Guide for Application Developers. Details of the object-oriented design and functionality of the Geant4 toolkit are given in the User's Guide for Toolkit Developers. The Installation Guide for Setting up Geant4 in Your Computing Environment describes how to get the Geant4 code, install it, and run it.