d4/db5/a00328_source.html

#include <CLHEP/Units/PhysicalConstants.h>


using CLHEP::pi;

using CLHEP::twopi;

using CLHEP::halfpi;

using CLHEP::c_light;

using CLHEP::electron_charge;

using CLHEP::h_Planck;

using CLHEP::hbarc;

using CLHEP::fine_structure_const;

using CLHEP::electron_mass_c2;

using CLHEP::proton_mass_c2;

using CLHEP::neutron_mass_c2;