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Elementary Particles

Elementary Particles
Leptons
ParticleSymbolMass (MeV/c2)Electric Charge
electrone-0.511-1
muonμ-105.7-1
tauτ1784.1-1
electron neutrinoνe<7.3×10-60
muon neutrinoνμ<0.270
tau neutrinoντ<350
Quarks1
downd5–15- 1/3
upu2–8 2/3
stranges100–300- 1/3
charmc1300–1700 2/3
bottomb4700–5300- 1/3
topt>91,000 2/3
Gauge Bosons
photonγ00
gluong00
W-bosonW80,2001
Z-bosonZ91,1700
Some Sample Hadrons
positive pionπ+139.61
positive kaonK+493.71
protonp938.31
neutronn939.60
lambdaΛ1115.60
For each of these particles, except the photon, gluon, and Z-boson, there is an antiparticle with the same mass and opposite charge. In most cases the antiparticle is denoted by an overbar over the particle symbol.
Note 1:
Because quarks cannot be isolated, the masses given for them are approximate.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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