Accelerator Physics/Constants

Constants

Name	symbol	Value
Speed of light	$c$	$2.99792458\times 10^{8}\ \mathrm {m/s}$
Electron charge	$e$	$1.60217733\times 10^{-19}\ \mathrm {C}$
Electron mass	$m_{e}$	$0.511\ \mathrm {MeV/c^{2}}$
Muon mass	$m_{\mu }$	$105.6583745(24)\ \mathrm {MeV/c^{2}}$
Pion mass	$m_{\pi }$	$139.57018(35)\ \mathrm {MeV/c^{2}}$
Muon mean lifetime	$\tau _{\mu }$	$2.1969811(22)\ \mathrm {\mu s}$
Pion mean lifetime	$\tau _{\pi }$	$26.033\pm 0.005\ \mathrm {ns}$
Permeability of free space	$\mu _{0}$	$4\pi \times 10^{-7}\mathrm {T\cdot m/A}$
Permitivity of free space	$\epsilon _{0}$	$8.854187817\times 10^{-12}\ \mathrm {F/m}$
Planck constant	$h$	$4.1356675\times 10^{-15}\ \mathrm {eV\cdot s}$
Dirac constant (reduced Planck constant)	$\hbar$	$6.5821195\times 10^{-16}\ \mathrm {eV\cdot s}$
Compton wavelength	$\lambda _{C}$	$2.42631058\times 10^{-12}\ \mathrm {m}$