Bottom eta meson

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Bottom eta meson (η
Composition bb
Statistics Bosonic
Symbol η
Mass 9388.9+3.1
± 2.7 MeV/c2
Electric charge 0 C
Spin 0

The bottom eta meson (η
) 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[edit]


  1. Aubert, B.; et al. (2008). "Observation of the Bottomonium Ground State in the Decay ϒ(3S)→γη
    (PDF). Phys. Rev. Lett. 101 (7): 071801. Bibcode:2008PhRvL.101g1801A. doi:10.1103/PhysRevLett.101.071801. PMID 18764521.
  2. Godfrey, S. (2008). "Searching high and low for bottomonium". Physics 1: 11. Bibcode:2008PhyOJ...1...11G. doi:10.1103/Physics.1.11.