Bottom etameson (η
_b)

Thequark structure of the bottom eta meson. The color assignment of individual quarks is arbitrary, but the netcolor charge must be zero. Forces between quarks are mediated bygluons.
Composition	bb
Statistics	Bosonic
Family	Mesons
Interactions	Strong,weak,electromagnetic,gravity
Symbol	η b
Antiparticle	Self
Discovered	SLAC (2008)
Types	1
Mass	9388.9+3.1 −2.3 MeV/c2
Electric charge	0e
Spin	0
Isospin	0
Hypercharge	0
Parity	-1
C parity	+1

Thebottom eta meson (η
_b) oreta-b meson is aflavourlessmeson formed from abottom quark and itsantiparticle. It was first observed by theBaBar experiment atSLAC in 2008, and is the lightest particle containing a bottom and anti-bottom quark.

• Eta and eta prime mesons, a similar particle with light quarks.
• Quarkonium, the general name for mesons formed from aquark and the corresponding antiquark.
• List of mesons

1. Aubert, B.; et al. (2008). "Observation of the Bottomonium Ground State in the Decayϒ(3S)→γη
   _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.Bibcode:2008PhyOJ...1...11G.doi:10.1103/Physics.1.11.

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