How to use the hepunits.constants.c_light function in hepunits
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scikit-hep / particle / src / particle / particle / particle.py View on Github 
def ctau(self):
# type: () -> Optional[float]
"""
The particle c*tau, in millimeters.
None is returned if the particle width (stored in the DB) is unknown.
"""
return (
c_light * self.lifetime
if self.width is not None and self.lifetime is not None
else None
)hepunits
Units and constants in the HEP system of units
