CP Violation in Bs Mixing from Heavy Higgs Boson Exchange

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 B-s-(B) over bar (s) 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 B-s -> 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 B-s-(B) over bar (s) mixing but also in Delta B = 1 transitions or in B-d-(B) over bar (d) mixing.