1 // Boost.Units - A C++ library for zero-overhead dimensional analysis and
2 // unit/quantity manipulation and conversion
4 // Copyright (C) 2003-2008 Matthias Christian Schabel
5 // Copyright (C) 2008 Steven Watanabe
7 // Distributed under the Boost Software License, Version 1.0. (See
8 // accompanying file LICENSE_1_0.txt or copy at
9 // http://www.boost.org/LICENSE_1_0.txt)
11 #ifndef BOOST_UNITS_CODATA_TAU_CONSTANTS_HPP
12 #define BOOST_UNITS_CODATA_TAU_CONSTANTS_HPP
14 #include <boost/units/quantity.hpp>
15 #include <boost/units/static_constant.hpp>
17 #include <boost/units/systems/detail/constants.hpp>
18 #include <boost/units/systems/si/amount.hpp>
19 #include <boost/units/systems/si/area.hpp>
20 #include <boost/units/systems/si/electric_charge.hpp>
21 #include <boost/units/systems/si/energy.hpp>
22 #include <boost/units/systems/si/frequency.hpp>
23 #include <boost/units/systems/si/length.hpp>
24 #include <boost/units/systems/si/mass.hpp>
25 #include <boost/units/systems/si/magnetic_flux_density.hpp>
26 #include <boost/units/systems/si/time.hpp>
27 #include <boost/units/systems/si/wavenumber.hpp>
29 #include <boost/units/systems/si/codata/typedefs.hpp>
32 /// CODATA recommended values of fundamental atomic and nuclear constants
33 /// CODATA 2006 values as of 2007/03/30
45 /// CODATA recommended values of the fundamental physical constants: NIST SP 961
48 BOOST_UNITS_PHYSICAL_CONSTANT(m_tau,quantity<mass>,3.16777e-27*kilograms,5.2e-31*kilograms);
49 /// tau-electron mass ratio
50 BOOST_UNITS_PHYSICAL_CONSTANT(m_tau_over_m_e,quantity<dimensionless>,3477.48*dimensionless(),5.7e-1*dimensionless());
51 /// tau-muon mass ratio
52 BOOST_UNITS_PHYSICAL_CONSTANT(m_tau_over_m_mu,quantity<dimensionless>,16.8183*dimensionless(),2.7e-3*dimensionless());
53 /// tau-proton mass ratio
54 BOOST_UNITS_PHYSICAL_CONSTANT(m_tau_over_m_p,quantity<dimensionless>,1.89390*dimensionless(),3.1e-4*dimensionless());
55 /// tau-neutron mass ratio
56 BOOST_UNITS_PHYSICAL_CONSTANT(m_tau_over_m_n,quantity<dimensionless>,1.89129*dimensionless(),3.1e-4*dimensionless());
58 BOOST_UNITS_PHYSICAL_CONSTANT(M_tau,quantity<mass_over_amount>,1.90768e-3*kilograms/mole,3.1e-7*kilograms/mole);
59 /// tau Compton wavelength
60 BOOST_UNITS_PHYSICAL_CONSTANT(lambda_C_tau,quantity<length>,0.69772e-15*meters,1.1e-19*meters);
64 } // namespace constants
72 #endif // BOOST_UNITS_CODATA_TAU_CONSTANTS_HPP