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