Mesons were originally predicted as carriers of the force that bind protons and neutrons together. When first discovered the muon was identified with this family from its similar mass and was named "mu meson", but did not show strong attraction to nuclear matter and is actually a lepton. Later the pion was discovered, which is the actual carrier and decays into the muon.
Particle  Symbol  Anti particle 
Makeup  Rest mass MeV/c^{2} 
S  C  B  Half life 

Pion  π^{+}  π^{}  <math>\mathrm{u \bar{d}}</math>  139.6  0  0  0  2.60×10^{8} 
Pion  π^{0}  Self  <math>\mathrm{\frac{u\bar{u} + d \bar{d}}{\sqrt{2}}}</math>  135.0  0  0  0  0.83×10^{16} 
Kaon[?]  K^{+}  K^{}  <math>\mathrm{u\bar{s}}</math>  493.7  +1  0  0  1.24×10^{8} 
Kaon  <math>\mathrm{K_S^0}</math>  <math>\mathrm{K_S^0}</math>  <math>\mathrm{\frac{d\bar{s}  s\bar{d}}{\sqrt{2}}}</math>  497.7  +1  0  0  0.89×10^{10} 
Kaon  <math>\mathrm{K_L^0}</math>  <math>\mathrm{K_L^0}</math>  <math>\mathrm{\frac{d\bar{s} + s\bar{d}}{\sqrt{2}}}</math>  497.7  +1  0  0  5.2×10^{8} 
Eta  η^{0}  Self  <math>\mathrm{\frac{u\bar{u} + d\bar{d}  2s\bar{s}}{\sqrt{6}}}</math>  548.8  0  0  0  <10^{18} 
Rho  ρ^{+}  ρ^{}  <math>\mathrm{u\bar{d}}</math>  770  0  0  0  0.4×10^{23} 
Phi  φ  Self  <math>\mathrm{s\bar{s}}</math>  1020  0  0  0  20×10^{23} 
D  D^{+}  D^{}  <math>\mathrm{c\bar{d}}</math>  1869.4  0  +1  0  10.6×10^{13} 
D  D^{0}  <math>\mathrm{\bar{D^0}}</math>  <math>\mathrm{c\bar{u}}</math>  1864.6  0  +1  0  4.2×10^{13} 
D  <math>\mathrm{D_S^+}</math>  <math>\mathrm{D_S^}</math>  <math>\mathrm{c\bar{s}}</math>  1969  +1  +1  0  4.7×10^{13} 
J/Psi  J/Ψ  Self  <math>\mathrm{c\bar{c}}</math>  3096.9  0  0  0  0.8×10^{20} 
B  B^{}  B^{+}  <math>\mathrm{b\bar{u}}</math>  5279  0  0  1  1.5×10^{12} 
B  B^{0}  <math>\mathrm{\bar{B^0}}</math>  <math>\mathrm{d\bar{b}}</math>  5279  0  0  1  1.5×10^{12} 
Upsilon  Υ  Self  <math>\mathrm{b\bar{b}}</math>  9460.4  0  0  0  1.3×10^{20} 
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