Table 1: Physical units defined in the CLHEP Units module
The CLHEP Units module has been supplied by GEANT4. It consists of two header files which contain definitions of some frequently used physical constants and units:
CLHEP/Units/SystemOfUnits.h CLHEP/Units/PhysicalConstants.h
To make them available it is enough to insert in your program the following line:
#include "CLHEP/Units/PhysicalConstants.h"
All constants and units are defined via few so called basic units. The following units have been choosen as basic:
The CLHEP Units module can be considered as an attempt to provide a practical System of Units for HEP applications. Many standard HEP classes, for example in GEANT4 and CLHEP, assume that data are given in the System of Units defined in the CLHEP Units module. For this reason it is recommended to define any physical data with its units, e.g.
crossection = 3.5 * barn density = 10. * g/cm3
Tables 1 and 2 represent physical units and physical constants defined in the CLHEP Units module. Most of the physical constants have been taken from the Particle Data Book: "Phys. Rev. D volume 50 3-1 (1994) page 1233".
Table 1: Physical units defined in the CLHEP Units module
Table 2: Physical constants defined in the CLHEP Units module
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