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We present a study of the decays B0 -> D0 K*0 and B0 -> barD0 K*0 with K*0 ->K+pi-. The D0 and the barD0 mesons are reconstructed in the final statesf=K+pi-, K+pi-pi0, K+pi-pi+pi- and their charge conjugates. Using a sample of465 million BBbar pairs collected with the Babar detector at the PEP-IIasymmetric-energy e+e- collider at SLAC, we measure the ratioR_{ADS}=[Gamma(barB0 -> [f]_D barK*0)+Gamma(B0 -> [bar{f}]_D K*0)]/[Gamma(barB0 -> [bar{f}]_D barK*0)+Gamma(B0 -> [f]_D K*0)] for the three finalstates. We do not find significant evidence for a signal and set the followinglimits at 95% probability: R_{ADS}(Kpi)<0.244, R_{ADS}(Kpipi0)<0.181 andR_{ADS}(Kpipipi)<0.391. From the combination of these three results, we findthat the ratio rS between the b -> u and the b -> c amplitudes lies in therange [0.07,0.41] at 95% probability.

Search for b-> u transitions in B0 -> D0 K*0 decays