List of mesons




This is a list of mesons. This list is not comprehensive; it is a stub.

Particle Symbol Anti-
particle 		Quark
Makeup 		Spin and parity Rest mass
MeV/c² 		S C B Mean lifetime
s 		Principal decays Notes
Charged
Pion 		π + π − \mathrm{u \bar{d}} Pseudoscalar 139.6 0 0 0 2.60×10-8 μ+ + νμ
Neutral
Pion 		π0 Self \mathrm{\frac{u\bar{u} - d \bar{d}}{\sqrt{2}}} Pseudoscalar 135.0 0 0 0 0.84×10-16 2γ Makeup inexact due to non-zero quark masses
Charged
Kaon 		K + K − \mathrm{u\bar{s}} Pseudoscalar 493.7 +1 0 0 1.24×10-8 μ + νμ
or π+ + π0
Neutral
Kaon 		K0 \mathrm{\bar{K}^0} \mathrm{d\bar{s}} Pseudoscalar 497.7 +1 0 0 weak decay Strong eigenstate - no definite lifetime (see kaon notes below)
K-Short \mathrm{K_S^0} \mathrm{K_S^0} \mathrm{\frac{d\bar{s} - s\bar{d}}{\sqrt{2}}} Pseudoscalar 497.7 (*) 0 0 0.89×10-10 π+ + π-
or 2π0 		Weak eigenstate - makeup is missing small CP-violating term (see kaon notes below)
K-Long \mathrm{K_L^0} \mathrm{K_L^0} \mathrm{\frac{d\bar{s} + s\bar{d}}{\sqrt{2}}} Pseudoscalar 497.7 (*) 0 0 5.2×10-8 π+ + e- + νe Weak eigenstate - makeup is missing small CP-violating term (see kaon notes below)
Eta η Self \mathrm{\frac{u\bar{u} + d\bar{d} - 2s\bar{s}}{\sqrt{6}}} Pseudoscalar 547.8 0 0 0 5×10-19 Makeup inexact due to non-zero quark masses
Eta
Prime 		η' Self \mathrm{\frac{u\bar{u} + d\bar{d} + s\bar{s}}{\sqrt{3}}} Pseudoscalar 957.6 0 0 0 3×10-21 Makeup inexact due to non-zero quark masses
Rho ρ + ρ − \mathrm{u\bar{d}} Vector 776 0 0 0 0.4×10-23
Phi φ Self \mathrm{s\bar{s}} Vector 1020 0 0 0 16×10-23
D D + D − \mathrm{c\bar{d}} Pseudoscalar 1869 0 +1 0 10.6×10-13
D D0 \mathrm{\bar{D^0}} \mathrm{c\bar{u}} Pseudoscalar 1865 0 +1 0 4.1×10-13
Ds \mathrm{D_s^+} \mathrm{D_s^-} \mathrm{c\bar{s}} Pseudoscalar 1968 +1 +1 0 4.9×10-13
J/Psi J / ψ Self \mathrm{c\bar{c}} Vector 3096.9 0 0 0 7.2×10-21 e+ + e- or
μ+ + μ- ... 		See charmonium
B B + B − \mathrm{u\bar{b}} Pseudoscalar 5279 0 0 +1 1.7×10-12
B B0 \mathrm{\bar{B^0}} \mathrm{d\bar{b}} Pseudoscalar 5279 0 0 +1 1.5×10-12
Bs \mathrm{B_s^0} \mathrm{\bar{B}_s^0} \mathrm{s\bar{b}} Pseudoscalar 5369 -1 0 +1 1.46×10-12
Bc \mathrm{B_c^+} \mathrm{B_c^-} \mathrm{c\bar{b}} Pseudoscalar 6400 0 +1 +1 5×10-13
Upsilon \Upsilon\, Self \mathrm{b\bar{b}} Vector 9460 0 0 0 1.3×10-20 e+ + e- or
μ+ + μ- ... 		See bottomonium

   

Notes on neutral kaons

There are two complications with kaons:

  1. Due to decay, so these are the particles with definite lifetime.
  2. Furthermore, the linear combinations given in the table for the \mathrm{K_S^0} and \mathrm{K_L^0} are not exactly correct, since there is a small correction due to CP violation. See CP violation in kaons.

Note that these issues also exist in principle for other neutral flavored mesons; however, the weak eigenstates are considered separate particles only for kaons because of their dramatically different lifetimes.

See also

References

  • Griffiths, David J. (1998). Introduction to Electrodynamics (3rd ed.). Prentice Hall. ISBN 0-13-805326-X. 
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Polaron
 
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