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The first observation of the decay B0 -> D0bar K+ K- is reported from ananalysis of 0.62 fb-1 of pp collision data collected with the LHCb detector.Its branching fraction is measured relative to that of the topologicallysimilar decay B0 -> D0bar pi+ pi- to be BR(B0 -> D0bar K+ K-)/BR(B0 -> D0barpi+ pi-) = 0.056+-0.011+-0.007, where the first uncertainty is statistical andthe second is systematic. The significance of the signal is 5.8 sigma.Evidence, with 3.8 sigma significance, for Bs -> D0bar K+ K- decays is alsopresented, with a relative branching fraction of BR(Bs -> D0bar K+ K-)/BR(B0 ->D0bar K+ K-) = 0.90+-0.27+-0.20.

Observation of the decay B0 -> D0bar K+ K- and evidence for Bs -> D0bar K+ K-