Bound on the ratio of decay amplitudes for (B)over-bar(0)-> J/psi K*(0) and B-0 -> J/psi K*(0)

We have measured the time-dependent decay rate for the process B-->J/psiK(*0)(892) in a sample of about 88x10(6) Y(4S)-->B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. In this sample we study flavor-tagged events in which one neutral B meson is reconstructed in the J/psiK(*0) or J/psi(K) over bar (*0) final state. We measure the coefficients of the cosine and sine terms in the time-dependent asymmetries for J/psiK(*0) and J/psi(K) over bar (*0), find them to be consistent with the standard model expectations, and set upper limits at 90% confidence level (C.L.) on the decay amplitude ratios A((B) over bar (0)-->J/psiK(*0))//A(B-0-->J/psiK(*0))<0.26 and A(B-0-->J/psi(K) over bar (*0))/A((B) over bar (0)-->J/psi(K) over bar (*0))<0.32. For a single ratio of wrong-flavor to favored amplitudes for B-0 and (B) over bar (0) combined, we obtain an upper limit of 0.25 at 90% C.L.