Mass ratios - NumberDB

Mass ratios

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Numbers

m_{1}

m_{2}

m_{1} / m_{2}

m_{α}

m_{u}

:

4.001506179127(63)

m_{α}

m_{e}

:

7294.29954142(24)

m_{α}

m_{p}

:

3.97259969009(22)

m_{d}

m_{u}

:

2.013553212745(40)

m_{d}

m_{e}

:

3670.48296788(13)

m_{d}

m_{p}

:

1.99900750139(11)

m_{e}

m_{u}

:

5.48579909065(16)e-4

m_{e}

m_{d}

:

2.724437107462(96)e-4

m_{e}

m_{h}

:

1.819543074573(79)e-4

m_{e}

m_{μ}

:

4.83633169(11)e-3

m_{e}

m_{n}

:

5.4386734424(26)e-4

m_{e}

m_{p}

:

5.44617021487(33)e-4

m_{e}

m_{τ}

:

2.87585(19)e-4

m_{e}

m_{α}

:

1.370933554787(45)e-4

m_{e}

m_{t}

:

1.819200062251(90)e-4

m_{h}

m_{u}

:

3.014932247175(97)

m_{h}

m_{e}

:

5495.88528007(24)

m_{h}

m_{p}

:

2.99315267167(13)

m_{μ}

m_{e}

:

206.7682830(46)

m_{μ}

m_{n}

:

0.1124545170(25)

m_{μ}

m_{p}

:

0.1126095264(25)

m_{μ}

m_{τ}

:

5.94635(40)e-2

m_{n}

m_{u}

:

1.00866491595(49)

m_{n}

m_{e}

:

1838.68366173(89)

m_{n}

m_{μ}

:

8.89248406(20)

m_{n}

m_{p}

:

1.00137841931(49)

m_{n}

m_{τ}

:

0.528779(36)

m_{p}

m_{u}

:

1.007276466621(53)

m_{p}

m_{e}

:

1836.15267343(11)

m_{p}

m_{μ}

:

8.88024337(20)

m_{p}

m_{n}

:

0.99862347812(49)

m_{p}

m_{τ}

:

0.528051(36)

m_{τ}

m_{e}

:

3477.23(23)

m_{τ}

m_{μ}

:

16.8170(11)

m_{τ}

m_{n}

:

1.89115(13)

m_{τ}

m_{p}

:

1.89376(13)

m_{t}

m_{u}

:

3.01550071621(12)

m_{t}

m_{e}

:

5496.92153573(27)

m_{t}

m_{p}

:

2.99371703414(15)

m_{W}

m_{Z}

:

0.88153(17)

Definition

This table lists ratios of rest masses of certain particles, where

m_{α}

is the alpha particle mass,

m_{u}

the atomic mass constant,

m_{d}

the deuteron mass,

m_{e}

the electron mass (the atomic unit of mass),

m_{h}

the helion mass,

m_{μ}

the muon mass,

m_{n}

the neutron mass,

m_{p}

the proton mass,

m_{τ}

the tau mass,

m_{t}

the triton mass,

m_{W}

the W boson mass, and

m_{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_{u}

is called the relative atomic mass of the given sample.

Links

[1]

The NIST Reference on Constants, Units, and Uncertainty

[2]

NIST Reference: Standard Uncertainty and Relative Standard Uncertainty

Data properties

Entries are of type: real number

Sources of data: [1] (based on CODATA 2018)

Reliability: See [2]