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Elementary Particles

Elementary Particles

Leptons

ParticleSymbol Mass (MeV/c 2 )Electric Charge
electron e -0.511 - 1
muon μ -105.7 - 1
tauτ1784.1 - 1
electron neutrino ν e <7.3×10 - 60
muon neutrino ν μ<0.270
tau neutrino ν τ<350

Quarks 1

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 pion π +139.61
positive kaon K +493.71
protonp938.31
neutronn939.60
lambdaΛ1115.60
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The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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