Constants (skhep.constants)ΒΆ

This module skhep.constants contains 2 sorts of constants:

  • Physical constants.
  • Common and/or handy constants.

All constants are computed in the HEP System of Units as defined in the skhep.units package.

Typical use case:

>>> from skhep.constants import c_light
>>> from skhep.units     import picosecond, micrometer
>>> tau_Bs = 1.5 * picosecond    # a particle lifetime, say the Bs meson's
>>> ctau_Bs = c_light * tau_Bs   # ctau of the particle, ~450 microns
>>> print ctau_Bs                # result in HEP units, so mm ;-)
0.449688687
>>> print ctau_Bs / micrometer   # result in micrometers
449.688687