CP violation in Bₛ mixing from heavy Higgs exchange

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The anomalous dimuon charge asymmetry reported by the D0 Collaboration may be due to the tree-level exchange of some spin-0 particles that mediate CP violation in Bₛ-Bₛ meson mixing. We show that for a range of couplings and masses, the heavy neutral states in a two Higgs doublet model can generate a large charge asymmetry. This range is natural in "uplifted supersymmetry", and may enhance the B- -> tau nu and Bₛ -> mu+ mu- decay rates. However, we point out that on general grounds the reported central value of the charge asymmetry requires new physics not only in Bₛ-Bₛ mixing but also in ΔB = 1 transitions or in Bd-Bd mixing.