Eta and eta prime mesons

The eta (
η
) and eta prime meson (
η′
) are isosinglet mesons made of a mixture of up, down and strange quarks and their antiquarks. The charmed eta meson (
η
c) and bottom eta meson (
η
b) are similar forms of quarkonium; they have the same spin and parity as the (light)
η
 defined, but are made of charm quarks and bottom quarks respectively. The top quark is too heavy to form a similar meson, due to its very fast decay.

Eta and eta prime mesons
Composition

  • η
     : ≈

  • η′
     : ≈
StatisticsBosonic
FamilyMesons
InteractionsStrong, Weak, Gravitation, Electromagnetic
Symbol
η
,
η′
AntiparticleSelf
DiscoveredAihud Pevsner et al. (1961)
Types2
Mass
η
 : 547.862±0.018 MeV/c2

η′
 : 957.78±0.06 MeV/c2
Mean lifetime
η
: (5.0±0.3)×10−19 s,
η′
: (3.2±0.2)×10−21 s
Decays into

  • η
     :

    γ
     +
    γ
     or

    π0
     +
    π0
     +
    π0
     or

    π+
     +
    π0
     +
    π−

  • η′
     :

    π+
     +
    π−
     +
    η
     or
    (
    ρ0
     +
    γ
    ) / (
    π+
     +
    π−
     +
    γ
    ) or

    π0
     +
    π0
     +
    γ
Electric charge0 e
Spin0
Isospin0
Hypercharge0
Parity-1
C parity+1
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