Characteristics of Some Particles

Explanation of Characteristics

Elementary Particles

Family NameParticle NameChargeMassLifetime
classon
graviton00stable
photon00stable
lepton
electron-11stable
electron neutrino0about 0stable
muon-12092.2e-6
muon neutrino0< 0.49stable
tau-13,4903.0e-13
tau neutrino0< 69stable (?)
quark
up+2/3607stable
down-1/3607stable
charm+2/32,900?
strange-1/3988?
top+2/3> 100,000?
bottom-1/310,000?
weakon
W particle-1160,000?
Z particle0180,000?

Hadrons

Family NameParticle NameCompositionChargeMassLifetime
baryon
hyperon
lamdauds02,1832.6e-10
omegasss-13,272.8e-10
sigma +uus+12,328.8e-10
sigma 0[(u d +or- d u)s/sqrt(2)] 02,3346.0e-20
sigma -dds-12,3431.5e-10
xi 0uss02,5732.9e-10
xi -dss-12,5851.6e-10
nucleon
neutronudd01,839* 8.98e2
protonuud+11,836stable
meson
J particle[c c-bar]06,0601.0e-20
kaon +[u s-bar]+19661.2e-8
kaon 0[d s-bar] 0974** 8.9e-11
omega[(u u-bar + d d-bar)/sqrt(2)]01,5326.6e-23
pion +[u d-bar]+12732.6e-8
pion 0[(u u-bar - d d-bar)/sqrt(2)] 02648.4e-17

Explanation of Characteristics
CompositionHadrons are composed of quarks.
The first letter of the quark's name
is used in the formula.
ChargeExpressed as a multiple of a proton's charge,
1.60217733e-19 coulomb
MassGiven in multiples of an electron's mass,
9.1093897e-31 kilograms
LifetimeAverage decay time in seconds.
"stable" means that the particle does not decay.
* Stable if bound in a nucleus
** Composed of two particles; average lifetime of each given