Describes a number of elementary particles, namely, electron, photon, muon, and positron, if such a description is essential for a particular process. An example can be provided by photoionization.
If a particle is needed in some of the processes, then it must have a stateID (StateIDType) identifier to enable referencing it. The attribute name of the type is optional. It is defined as a restriction of String, that may take following values:
- photon
- electron
- muon
- positron
Other particle names may be added in future versions, based on schema users requests.
ParticleProperties XML element may contain some static properties of the particle:
- ParticleCharge integer element,
- ParticleMass element of DataType,
- ParticleSpin (type AngularMomentumType), and
- ParticlePolarization element (type AngularMomentumProjectionType).