Eta and eta prime mesons

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
[1]

η′
 : 957.78±0.06 MeV/c2
[1]
Mean lifetime
η
: (5.0±0.3)×10−19 s
,
η′
: (3.2±0.2)×10−21 s
Decays into
Electric chargee
Spin0
Isospin0
Hypercharge0
Parity-1
C parity+1

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.

  1. ^ a b Cite error: The named reference PDG14 was invoked but never defined (see the help page).