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Chapter 33 | Particle Physics 1491
Table 33.2 Selected Particle Characteristics[4]
Particle Rest mass Category name Symbol Antiparticle
Gauge
Photon Self 0
0 0
0 0
0 0
0
0
0 0
0 0
0 0
0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0
0 0
0 0
0 0
Stable
Stable Stable
Stable
Stable
Lifetime[5] (s)
Bosons
Leptons
Self Electron
Neutrino (e)
Muon
Neutrino
0.511 [6]
105.7
Tau 1777
Neutrino
Hadrons (selected)
Self
139.6 0 0 0
135.0 0 0 0
493.7 0 0 0
497.6 0 0 0
547.9 0 0 0
0 0
0 0
0
0
0 0
2.60 × 10 −8 8.4 × 10 −17 1.24 × 10 −8 0.90 × 10 −10 2.53 × 10 −19
Mesons
Pion
Kaon
Eta
(many other mesons known)
Self
Proton Neutron
938.3 ±1 0 0
939.6 ± 1 0 0
1115.7 ±1 0 0
1189.4 ±1 0 0
1192.6 ±1 0 0
1197.4 ±1 0 0
1314.9 ±1 0 0
1321.7 ± 1 0 0
1672.5 ±1 0 0
0 0
0 0
0
0
0
0
0
0
0
Stable[7]
882
2.63 × 10 −10 0.80 × 10 −10 7.4 × 10 −20 1.48 × 10 −10 2.90 × 10 −10 1.64 × 10 −10 0.82 × 10 −10
Lambda
Omega
Baryons
Sigma
Xi
(many other baryons known)
All known leptons are listed in the table given above. There are only six leptons (and their antiparticles), and they seem to be fundamental in that they have no apparent underlying structure. Leptons have no discernible size other than their wavelength, so
4. The lower of the or symbols are the values for antiparticles.
5. Lifetimes are traditionally given as (which is , the inverse of the decay constant). 6. Neutrino masses may be zero. Experimental upper limits are given in parentheses.
7. Experimental lower limit is for proposed mode of decay.
