Constants.hh
#ifndef RIVET_MATH_CONSTANTS
#define RIVET_MATH_CONSTANTS
#include "Rivet/Math/MathHeader.hh"
#include "Rivet/Math/Units.hh"
namespace Rivet {
//
//
//
static const double pi = 3.14159265358979323846;
static const double twopi = 2*pi;
static const double halfpi = pi/2;
static const double pi2 = pi*pi;
//
//
//
static const double Avogadro = 6.0221367e+23/mole;
//
// c = 299.792458 mm/ns
// c^2 = 898.7404 (mm/ns)^2
//
static const double c_light = 2.99792458e+8 * m/s;
static const double c_squared = c_light * c_light;
//
// h = 4.13566e-12 MeV*ns
// hbar = 6.58212e-13 MeV*ns
// hbarc = 197.32705e-12 MeV*mm
//
static const double h_Planck = 6.6260755e-34 * joule*s;
static const double hbar_Planck = h_Planck/twopi;
static const double hbarc = hbar_Planck * c_light;
static const double hbarc_squared = hbarc * hbarc;
//
//
//
static const double electron_charge = - eplus; // see SystemOfUnits.h
static const double e_squared = eplus * eplus;
//
// amu_c2 - atomic equivalent mass unit
// amu - atomic mass unit
//
static const double electron_mass_c2 = 0.51099906 * MeV;
static const double proton_mass_c2 = 938.27231 * MeV;
static const double neutron_mass_c2 = 939.56563 * MeV;
static const double amu_c2 = 931.49432 * MeV;
static const double amu = amu_c2/c_squared;
//
// permeability of free space mu0 = 2.01334e-16 Mev*(ns*eplus)^2/mm
// permittivity of free space epsil0 = 5.52636e+10 eplus^2/(MeV*mm)
//
static const double mu0 = 4*pi*1.e-7 * henry/m;
static const double epsilon0 = 1./(c_squared*mu0);
//
// electromagnetic coupling = 1.43996e-12 MeV*mm/(eplus^2)
//
static const double elm_coupling = e_squared/(4*pi*epsilon0);
static const double fine_structure_const = elm_coupling/hbarc;
static const double classic_electr_radius = elm_coupling/electron_mass_c2;
static const double electron_Compton_length = hbarc/electron_mass_c2;
static const double Bohr_radius = electron_Compton_length/fine_structure_const;
static const double alpha_rcl2 = fine_structure_const
*classic_electr_radius
*classic_electr_radius;
static const double twopi_mc2_rcl2 = twopi*electron_mass_c2
*classic_electr_radius
*classic_electr_radius;
//
//
//
static const double k_Boltzmann = 8.617385e-11 * MeV/kelvin;
//
//
//
static const double STP_Temperature = 273.15*kelvin;
static const double STP_Pressure = 1.*atmosphere;
static const double kGasThreshold = 10.*mg/cm3;
//
//
//
static const double universe_mean_density = 1.e-25*g/cm3;
}
#endif
Rivet
Definition: MC_JetAnalysis.hh:9