The bottom eta meson (
η
b
) or eta-b meson is a flavourless meson formed from a bottom quark and its antiparticle. It was first observed by the BaBar experiment at SLAC in 2008, and is the lightest particle containing a bottom and anti-bottom quark.

Bottom eta meson (
η
b
)
The quark structure of the bottom eta meson. The color assignment of individual quarks is arbitrary, but the net color charge must be zero. Forces between quarks are mediated by gluons.
Composition
b

b
StatisticsBosonic
FamilyMesons
InteractionsStrong, weak, electromagnetic, gravity
Symbol
η
b
AntiparticleSelf
DiscoveredSLAC (2008)
Types1
Mass9388.9+3.1
−2.3
 MeV/c2
Electric charge0 e
Spin0
Isospin0
Hypercharge0
Parity-1
C parity+1

See also

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References

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  1. Aubert, B.; et al. (2008). "Observation of the Bottomonium Ground State in the Decay
    ϒ
    (3S)→
    γ

    η
    b
    ". Physical Review Letters. 101 (7): 071801. arXiv:0807.1086. Bibcode:2008PhRvL.101g1801A. doi:10.1103/PhysRevLett.101.071801. PMID 18764521. S2CID 17291017.
  2. Godfrey, S. (2008). "Searching high and low for bottomonium". Physics. Vol. 1. p. 11. Bibcode:2008PhyOJ...1...11G. doi:10.1103/Physics.1.11.