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We provide a review of predictions for sin 2beta_eff in b->s penguindominated modes based on 1/m_b expansion and/or SU(3) flavor symmetry. Theexperimental results are consistently lower than the theoretical predictions.In order to interpret whether this effect is a sign of new physicscontributions or can be explained away within the Standard Model a theoreticalinput cannot be avoided. The effect survives at a level larger than 2.1 sigmain a conservative average over different modes that includes theoreticalpredictions.

Predictions for sin 2(beta/phi_1)_eff in b->s penguin dominated modes