Bottom eta meson
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.
| Composition | b b |
|---|---|
| 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 | 0 e |
| Spin | 0 |
| Isospin | 0 |
| Hypercharge | 0 |
| Parity | -1 |
| C parity | +1 |
See also
- Eta and eta prime mesons, a similar particle with light quarks.
- Quarkonium, the general name for mesons formed from a quark and the corresponding antiquark.
- List of mesons
References
- 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. - Godfrey, S. (2008). "Searching high and low for bottomonium". Physics. Vol. 1. p. 11. Bibcode:2008PhyOJ...1...11G. doi:10.1103/Physics.1.11.
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