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We report the observation of the b -> d penguin-dominated decay B0 -> K*0K*0bar with a sample of 383.2 +/- 4.2 million BBbar pairs collected with theBaBar detector at the PEP-II asymmetric-energy e^+e^- collider at the StanfordLinear Accelerator Center. The measured branching fraction is Br(B0 -> K*0K*0bar) = [1.28^{+0.35}_{-0.30} +/- 0.11] x 10^{-6} and the fraction oflongitudinal polarization f_L (B0 -> K*0 K*0bar) = 0.80^{+0.10}_{-0.12} +/-0.06. The first error quoted is statistical and the second systematic. We alsoobtain an upper limit at the 90% confidence level on the branching fraction forBr(B0 ->K*0 K*0) < 0.41 x 10^{-6}.

Observation of B0 -> K*0 K*0bar and search for B0 -> K*0 K*0

Observation of B0 -> K0 K0bar and search for B0 -> K0 K0