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ELEMENTARY
PARTICLE SYMBOL*
MASS
MEAN LIFE,
MeV (^) me s
Photon (^) Y 0 0 co
Neutrino v^ ;^0 0 co
PTC^ Electron^ e-^ e+^ 0,511^1 co Muon (^) lc IL+ 105,66 206, 77 2,2.10-
n+ n-^ 139,6 273,2^ 2,55.10- Pions
{ To (^) 135,0 264,2 2.10^16
Kaons {^ K +^ IC^ 493,8^ 966,3^ 1,23.10- ESC^ K°^ ko^ 498,0^ 974,^
10-10_10-
Eta meson 71 548, 8 1074 2,4.10-1°
BARYONS
Proton (^) p i 5 938,26 1836,1 co
Neutron (^) n R 939,55 1838,6 1.10- Lambda hyperon A°^ A°^ 1115,4^ 2182,8^ 2,6.
r i-^ 1189,4^2328 0,8.104°
Sigma hyperons /-^ i+^1197 2342 1,6.104° 2 0 io 1192 2333 <10-
1321 2585 1,7.104° Xi hyperons { EF:o ::^1314 2572 3.10"^10
Omega hyperon 12- ir 1675 3278 _leo
- Symbols on the right-hand side denote antiparticles
PARTICLES
SPIN
h
CHARGES
ISOTOPIC
SPIN
STRANGENESS
S^
PRINCIPAL
DECAY
Q L^ B^ T^ 7', MODE
1 /2 (^) - 1 +1 0 1.1.---.e-4-v,+:4e
0 +1 0^0 1 +1 o (^) ni—R++,9, o 0 0 0 1 0 0 no_.2.t. o +1^0 0 1/2^ +1/2^ +1 KL. p.4+ v , 0 0 0 0 14 -1/2^ +1 K^0 --.^ 2n, n ev (^0 0 0 0 0 0 0) 1-.2y, 3n
1 /2 +1 0 +1 1/2^ +1/2^0
1 /2 0 0 +1^1 /2^ -1/2^0 n^ - ..p + e=1- 5^ e 1/2 (^0 0) +1 0 0 -1 it AO -../3 +n-
1/2 (^) +1 0 +1 1 +1 - 1 it- N + n
1 /2 - 1 0 +1^1 -^1 -^1 i.--wn + n-
1/2 0 0 +1^1 0 —1^ ILA0 + ),
1/2 —I 0 +1 1/2 _1/2^ -2^ ti=./1°+n- 1/2 (^0 0) +1 1 /2 +1/2 - 2.^ el,.A0+ no
3 /2^ -^1 0 +1^0 0 -^3 51-.2+n, AN ff -
Note. Particles and corresponding antiparticles have the identical values of mass, mean life, spin, and isotopic spin T, while their electric Q,^ lepton^ L,^ and baryon^ B^ charges, projections of isotopic spin Tz , and strangeness S,^ have the values that are opposite in sign.
