Implications of large dimuon CP asymmetry in Bd,sdecays on minimal flavor violation with low tan beta

The D0 collaboration has recently announced evidence for a dimuon CP asymmetry in B-d,B-s decays of order one percent. If confirmed, this asymmetry requires new physics. We argue that for minimally flavor violating (MFV) new physics, and at low tan beta = v(u)/v(d), there are only two four-quark operators (Q(2,3)) that can provide the required CP violating effect. The scale of such new physics must lie below 260GeV root tan beta. The effect is universal in the B-s and B-d systems, leading to S-psi K similar to sin2 beta - 0.15 and S-psi phi similar to 0.25. The effects on is an element of(K) and on electric dipole moments are negligible. The most plausible mechanism is tree-level scalar exchange. MFV supersymmetry with low tan beta will be excluded. Finally, we explain how a pattern of deviations from the Standard Model predictions for S-psi phi, S psi K and is an element of(K) can be used to test MFV and, if MFV holds, to probe its structure in detail.