Bottom eta meson

Bottom eta meson (
η
_b)

Composition	b b
Statistics	Bosonic
Family	Hadrons
Symbol	η b
Mass	9388.9+3.1 −2.3 ± 2.7 MeV/c2
Electric charge	0 C
Spin	0

The bottom eta meson (
η
_b) or eta-b meson is a flavorless 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.

See also

• Quarkonium, the general name for mesons formed from a quark and the corresponding antiquark.
• List of mesons

References

1. Aubert, B.; et al. (2008). "Observation of the Bottomonium Ground State in the Decay
   ϒ
   (3S)→
   γ
   
   η
   _b" (PDF). Phys. Rev. Lett. 101 (7): 071801. Bibcode:2008PhRvL.101g1801A. doi:10.1103/PhysRevLett.101.071801. PMID 18764521. {{cite journal}}: Explicit use of et al. in: |author= (help)
2. Godfrey, S. (2008). "Searching high and low for bottomonium". Physics. 1: 11. Bibcode:2008PhyOJ...1...11G. doi:10.1103/Physics.1.11.