Mass ratios
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Numbers
$m_1$
$m_2$ 
$m_1/m_2$
$m_\alpha$
$m_{\rm{u}}$:
4.001506179127(63)
$m_\alpha$
$m_{\rm{e}}$:
7294.29954142(24)
$m_\alpha$
$m_{\rm{p}}$:
3.97259969009(22)
$m_{\rm{d}}$
$m_{\rm{u}}$:
2.013553212745(40)
$m_{\rm{d}}$
$m_{\rm{e}}$:
3670.48296788(13)
$m_{\rm{d}}$
$m_{\rm{p}}$:
1.99900750139(11)
$m_{\rm{e}}$
$m_{\rm{u}}$:
5.48579909065(16)e-4
$m_{\rm{e}}$
$m_{\rm{d}}$:
2.724437107462(96)e-4
$m_{\rm{e}}$
$m_{\rm{h}}$:
1.819543074573(79)e-4
$m_{\rm{e}}$
$m_\mu$:
4.83633169(11)e-3
$m_{\rm{e}}$
$m_{\rm{n}}$:
5.4386734424(26)e-4
$m_{\rm{e}}$
$m_{\rm{p}}$:
5.44617021487(33)e-4
$m_{\rm{e}}$
$m_\tau$:
2.87585(19)e-4
$m_{\rm{e}}$
$m_\alpha$:
1.370933554787(45)e-4
$m_{\rm{e}}$
$m_{\rm{t}}$:
1.819200062251(90)e-4
$m_{\rm{h}}$
$m_{\rm{u}}$:
3.014932247175(97)
$m_{\rm{h}}$
$m_{\rm{e}}$:
5495.88528007(24)
$m_{\rm{h}}$
$m_{\rm{p}}$:
2.99315267167(13)
$m_\mu$
$m_{\rm{e}}$:
206.7682830(46)
$m_\mu$
$m_{\rm{n}}$:
0.1124545170(25)
$m_\mu$
$m_{\rm{p}}$:
0.1126095264(25)
$m_\mu$
$m_\tau$:
5.94635(40)e-2
$m_{\rm{n}}$
$m_{\rm{u}}$:
1.00866491595(49)
$m_{\rm{n}}$
$m_{\rm{e}}$:
1838.68366173(89)
$m_{\rm{n}}$
$m_\mu$:
8.89248406(20)
$m_{\rm{n}}$
$m_{\rm{p}}$:
1.00137841931(49)
$m_{\rm{n}}$
$m_\tau$:
0.528779(36)
$m_{\rm{p}}$
$m_{\rm{u}}$:
1.007276466621(53)
$m_{\rm{p}}$
$m_{\rm{e}}$:
1836.15267343(11)
$m_{\rm{p}}$
$m_\mu$:
8.88024337(20)
$m_{\rm{p}}$
$m_{\rm{n}}$:
0.99862347812(49)
$m_{\rm{p}}$
$m_\tau$:
0.528051(36)
$m_\tau$
$m_{\rm{e}}$:
3477.23(23)
$m_\tau$
$m_\mu$:
16.8170(11)
$m_\tau$
$m_{\rm{n}}$:
1.89115(13)
$m_\tau$
$m_{\rm{p}}$:
1.89376(13)
$m_{\rm{t}}$
$m_{\rm{u}}$:
3.01550071621(12)
$m_{\rm{t}}$
$m_{\rm{e}}$:
5496.92153573(27)
$m_{\rm{t}}$
$m_{\rm{p}}$:
2.99371703414(15)
$m_{\rm{W}}$
$m_{\rm{Z}}$:
0.88153(17)
Definition
This table lists ratios of rest masses of certain particles, where $m_\alpha$ is the alpha particle mass, $m_{\rm u}$ the atomic mass constant, $m_{\rm d}$ the deuteron mass, $m_{\rm e}$ the electron mass (the atomic unit of mass), $m_{\rm h}$ the helion mass, $m_\mu$ the muon mass, $m_{\rm n}$ the neutron mass, $m_{\rm p}$ the proton mass, $m_\tau$ the tau mass, $m_{\rm t}$ the triton mass, $m_{\rm W}$ the W boson mass, and $m_{\rm Z}$ the Z boson mass. The measurements and their uncertainties are given in the format of [2].
Parameters
$m_1$
—   mass in numerator
$m_2$
—   mass in denominator
Comments
(1)
The ratios of the mass of a sample by $m_{\rm u}$ is called the relative atomic mass of the given sample.
Links
Data properties
Numbers are of type: real number
Sources of data: [1] (based on CODATA 2018)
Reliability: See [2]