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NAME
SYMBOL
VALUE
Mass Ratio, Electron-Deuteron
m
e
/m
d
2.7244371170(58) × 10
-4
Mass Ratio, Electron-Muon
m
e
/m
µ
4.83633210(15) × 10
-3
Mass Ratio, Electron-Neutron
m
e
/m
n
5.438673462(12) × 10
-4
Mass Ratio, Electron-Proton
m
e
/m
p
5.446170232(12) × 10
-4
Mass Ratio, Electron-Tau
m
e
/m
τ
2.87555(47) × 10
-4
Mass Ratio, Muon-Electron
m
µ
/m
e
206.7682657(63)
Mass Ratio, Muon-Neutron
m
µ
/m
n
0.1124545079(34)
Mass Ratio, Muon-Proton
m
µ
/m
p
0.1126095173(34)
Mass Ratio, Muon-Tau
m
µ
/m
τ
5.94572(97) × 10
-2
Mass Ratio, Neutron-Electron
m
n
/m
e
1.8386836550(40)
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