1 /***************************************************************************
5 * Author: CLHEP (see below)
6 ***************************************************************************
8 * Description: Taken as-is from CLHEP.
9 * Modified original CVS-Id to retain version info.
10 ***************************************************************************
13 * Revision 1.1.1.1 2007/04/25 15:38:41 panos
14 * Importing the HBT code dir
16 * Revision 1.1.1.1 2007/03/07 10:14:49 mchojnacki
17 * First version on CVS
19 * Revision 1.2 1999/02/22 16:52:47 didenko
22 * Revision 1.1 1999/01/30 03:58:59 fisyak
23 * Root Version of StarClassLibrary
25 * Revision 1.1 1999/01/23 00:27:34 ullrich
28 **************************************************************************/
30 #ifndef HEP_PHYSICAL_CONSTANTS_H
31 #define HEP_PHYSICAL_CONSTANTS_H
33 #include "SystemOfUnits.h"
35 #ifndef ST_NO_NAMESPACES
37 using namespace units;
45 #define M_PI 3.14159265358979312
49 //extern const double pi; // from <math.h>
51 static const double pi = M_PI; // from <math.h>
53 static const double twopi = 2*pi;
54 static const double halfpi = pi/2;
55 static const double pi2 = pi*pi;
60 static const double Avogadro = 6.0221367e+23/mole;
63 // c = 299.792458 mm/ns
64 // c^2 = 898.7404 (mm/ns)^2
66 static const double c_light = 2.99792458e+8 * meter/second;
67 static const double c_squared = c_light * c_light;
70 // h = 4.13566e-12 MeV*ns
71 // hbar = 6.58212e-13 MeV*ns
72 // hbarc = 197.32705e-12 MeV*mm
74 static const double h_Planck = 6.6260755e-34 * joule*second;
75 static const double hbar_Planck = h_Planck/twopi;
76 static const double hbarc = hbar_Planck * c_light;
77 static const double hbarc_squared = hbarc * hbarc;
82 static const double electron_charge = - eplus; // see SystemOfUnits.h
83 static const double e_squared = eplus * eplus;
86 // amu_c2 - atomic equivalent mass unit
87 // amu - atomic mass unit
89 static const double electron_mass_c2 = 0.51099906 * MeV;
90 static const double proton_mass_c2 = 938.27231 * MeV;
91 static const double neutron_mass_c2 = 939.56563 * MeV;
92 static const double amu_c2 = 931.49432 * MeV;
93 static const double amu = amu_c2/c_squared;
95 static const double kaon_0_short_mass_c2 = 497.672 * MeV;
96 static const double pion_plus_mass_c2 = 139.5700 * MeV;
97 static const double pion_minus_mass_c2 = 139.5700 * MeV;
98 static const double lambda_mass_c2 = 1115.684 * MeV;
99 static const double antilambda_mass_c2 = 1115.684 * MeV;
100 static const double xi_minus_mass_c2 = 1321.32 * MeV;
104 // permeability of free space mu0 = 2.01334e-16 Mev*(ns*eplus)^2/mm
105 // permittivity of free space epsil0 = 5.52636e+10 eplus^2/(MeV*mm)
107 static const double mu0 = 4*pi*1.e-7 * henry/meter;
108 static const double epsilon0 = 1./(c_squared*mu0);
111 // electromagnetic coupling = 1.43996e-12 MeV*mm/(eplus^2)
113 static const double elm_coupling = e_squared/(4*pi*epsilon0);
114 static const double fine_structure_const = elm_coupling/hbarc;
115 static const double classic_electr_radius = elm_coupling/electron_mass_c2;
116 static const double electron_Compton_length = hbarc/electron_mass_c2;
117 static const double Bohr_radius = electron_Compton_length/fine_structure_const;
119 static const double alpha_rcl2 = fine_structure_const
120 *classic_electr_radius
121 *classic_electr_radius;
123 static const double twopi_mc2_rcl2 = twopi*electron_mass_c2
124 *classic_electr_radius
125 *classic_electr_radius;
129 static const double k_Boltzmann = 8.617385e-11 * MeV/kelvin;
134 static const double STP_Temperature = 273.15*kelvin;
135 static const double STP_Pressure = 1.*atmosphere;
136 static const double kGasThreshold = 1.e-2*gram/centimeter3;
138 #endif /* HEP_PHYSICAL_CONSTANTS_H */