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We point out that time-dependent CP asymmetries in B_s to K^{*0} \bar K^{*0}decays probe the presence of new physics in b to s transitions with anunprecedented theoretical accuracy. We show that, contrary to the case of B_dto phi K_S, it is possible to obtain a model-independent prediction for thecoefficient S(B_s to K^{*0} \bar K^{*0}) in the Standard Model. We give anestimate of the experimental precision achievable with the next generation of Bphysics experiments. We also discuss how this approach can be extended to thecase of B_s to \bar K^{*0} K^0, B_s to K^{*0} \bar K^0 and B_s to K^0 \bar K^0decays and the different experimental challenges for these channels.Comment: 4 pages, 1 figure. v2: Corrected dependence on CKM angles, expanded  discussion of multiple polarizations, conclusions strengthened. Final version  to appear in PR

physical review letters

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