SU(3) relations and the CP asymmetries in B decays to [Formula Presented] [Formula Presented] and [Formula Presented]

We consider CP asymmetries in neutral B meson decays to [Formula Presented] [Formula Presented] and [Formula Presented] We use SU(3) relations to estimate or bound the contributions to these amplitudes proportional to [Formula Presented] Such contributions induce a deviation of the [Formula Presented] terms measured in these time dependent CP asymmetries from that measured for [Formula Presented] For the [Formula Presented] mode, we estimate the deviation to be of order 0.1. For the [Formula Presented] mode, we obtain an upper bound on this deviation of order 0.3. For the [Formula Presented] mode, we have to add a mild dynamical assumption to the SU(3) analysis due to insufficient available data, yielding an upper bound of order 0.25. These bounds may improve significantly with future data. While they are large at present compared to the usually assumed standard model contribution, they are obtained with minimal assumptions and hence provide more rigorous tests for new physics. If measurements yield [Formula Presented] that are much larger than our bounds, it would make a convincing case for new physics.