Eta meson

Eta and eta prime mesons

Composition	η  : ≈ ${\displaystyle \mathrm {\tfrac {u{\bar {u}}+d{\bar {d}}-2s{\bar {s}}}{\sqrt {6}}} }$ η′  : ≈ ${\displaystyle \mathrm {\tfrac {u{\bar {u}}+d{\bar {d}}+s{\bar {s}}}{\sqrt {3}}} }$
Statistics	Bosonic
Interactions	Strong, Weak, Gravitation, Electromagnetic
Symbol	η , η′
Antiparticle	Self
Mass	η  : 7002547861999999999♠547.862±0.018 MeV/c2 η′  : 7002957780000000000♠957.78±0.06 MeV/c2
Mean lifetime	η : 6981500000000000000♠(5.0±0.3)×10−19 s, η′ : 6979319999999999999♠(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 charge	5000000000000000000♠0 e
Spin	Integer

η
 :

γ
+
γ
or

π0
+
π0
+
π0
or

π+
+
π0
+
π−


η′
 :

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

...
Wikipedia