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From Wikipedia, the free encyclopedia

Eta and eta prime mesons
Composition: η : \mathrm{\tfrac{u\bar{u} + d\bar{d} - 2s\bar{s}}{\sqrt{6}}}
η′ : \mathrm{\tfrac{u\bar{u} + d\bar{d} + s\bar{s}}{\sqrt{3}}}
Statistical behavior: Bosons
Group: Mesons
Interaction: Strong, Weak
Symbol(s): η, η′
Antiparticle: Self
Mass: η : 547.853 ± 0.024 MeV/c2
η′ : 957.66 ± 0.24MeV/c2
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 charge: 0 e
Spin: Integer

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

The eta was discovered in pion-nucleon collisions at the Bevatron in 1961.

The difference between the mass of the η and that of the η' is larger than the quark model can naturally explain. This "η-η' puzzle" is resolved by instantons.

See also

External links



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