Observation of the Annihilation Decay Mode B^{0} →K^{+} K^{−}

Author(s): R. Aaij et al. (LHCb Collaboration)

The LHCb Collaboration reports the rarest (8 in 100 million events) fully hadronic $B^0$ meson decay ever observed.

[Phys. Rev. Lett. 118, 081801] Published Tue Feb 21, 2017