CP violation in B_s mixing from heavy Higgs exchange

TL;DR

This paper explores how heavy Higgs bosons in a two Higgs doublet model could explain the D0 dimuon charge asymmetry through CP violation in B_s mixing, suggesting new physics contributions.

Contribution

It demonstrates that heavy neutral Higgs states in a two Higgs doublet model can produce significant CP violation effects consistent with the observed asymmetry, especially within uplifted supersymmetry.

Findings

Heavy Higgs exchange can generate large charge asymmetry in B_s mixing.

The model predicts enhanced B^- -> tau nu and B_s -> mu^+ mu^- decay rates.

Additional new physics is needed in other B decay processes to fully explain the asymmetry.

Abstract

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-\bar{B}_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-\bar{B}_s mixing but also in \Delta B = 1 transitions or in B_d-\bar{B}_d mixing.