Implications of large dimuon CP asymmetry in B_{d,s} decays on minimal flavor violation with low tan beta

Understand

The D0 collaboration has recently announced evidence for a dimuon CP asymmetry in B_{d,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 260 GeV sqrt{tan beta}.