EDMs vs. CPV in B_{s,d} mixing in two Higgs doublet models with MFV

TL;DR

This paper investigates how electric dipole moments and CP violation in B_{s,d} mixing are related within two Higgs doublet models with Minimal Flavour Violation, highlighting potential experimental signals of new physics.

Contribution

It demonstrates that sizable CP violation effects in B_s mixing can occur without conflicting with current EDM bounds and proposes ways to distinguish underlying CPV mechanisms.

Findings

Large CPV phases in B_s mixing imply EDMs near current experimental limits.

Enhanced B_{s,d} -> mu+ mu- decay rates over SM predictions.

Distinct correlation patterns between S_psi K_S and S_psi phi for different CPV mechanisms.

Abstract

We analyze the correlations between electric dipole moments (EDMs) of the neutron and heavy atoms and CP violation in B_{s,d} mixing in two Higgs doublet models respecting the Minimal Flavour Violation hypothesis, with flavour-blind CP-violating (CPV) phases. In particular, we consider the case of flavour-blind CPV phases from i) the Yukawa interactions and ii) the Higgs potential. We show that in both cases the upper bounds on the above EDMs do not forbid sizable non-standard CPV effects in B_s mixing. However, if a large CPV phase in B_s mixing will be confirmed, this will imply EDMs very close to their present experimental bounds, within the reach of the next generation of experiments, as well as BR(B_{s,d}-> mu^+ mu^-) typically largely enhanced over its SM expectation. The two flavour-blind CPV mechanisms can be distinguished through the correlation between S_psi K_S and S_psi phi that is strikingly different if only one of them is relevant. Which of these two CPV mechanisms dominates depends on the precise values of S_psi phi and S_psi K_S, as well as on the CKM phase (as determined by tree-level processes). Current data seems to show a mild preference for a hybrid scenario where both these mechanisms are at work.