Aubert, B. et al. (2008) Observation of B0→K*0K¯*0 and Search for B0→K*0K*0. Physical Review Letters, 100 (8). 081801. ISSN 0031-9007

We report the observation of the b→d penguin-dominated decay B0→K*0K̅ *0 with a sample of 383.2±4.2 million BB̅ pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at the Stanford Linear Accelerator Center. The measured branching fraction is B(B0→K*0K̅ *0)=[1.28-0.30+0.35±0.11]×10-6 and the fraction of longitudinal polarization is fL(B0→K*0K̅ *0)=0.80-0.12+0.10±0.06. The first error quoted is statistical and the second systematic. We also obtain an upper limit at the 90% confidence level on the branching fraction for B(B0→K*0K*0)<0.41×10-6.

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