Large loop effects of extra SUSY Higgs doublets to CP violation in B^0 mixing

TL;DR

This paper investigates how additional Higgs doublets in supersymmetric models can significantly influence CP violation in B^0 mixing through one-loop effects, potentially explaining recent experimental anomalies.

Contribution

It introduces a detailed calculation of loop effects from extra Higgs doublets on soft mass insertions and applies this to a Q_6 family symmetry model to analyze CP violation in B meson systems.

Findings

Large loop effects can enhance CP violation parameters by an order of magnitude.

Predicted CP asymmetries are consistent with some experimental results but still below the observed dimuon asymmetry.

Extra Higgs doublets can significantly impact flavor physics in supersymmetric models.

Abstract

We consider more than one pair of SU(2)_L doublet Higgs supermultiplets in a generic supersymmetric extension of the standard model, and calculate their one-loop contributions to the soft mass insertions delta_{LL} etc. We find that if large supersymmetry breaking in this sector is realized, the loop effects can give rise to large contributions to the soft mass insertions, meaning that they We apply our result to a recently proposed model based on the discrete Q_6 family group, and calculate the non-diagonal matrix element M_{12} of the neutral meson systems. We focus our attention on the extra phases phi_{d,s}^Delta in B_{d,s}-mixing and flavor-specific CP-asymmetries a_{sl}^{d,s} in neutral B decays and obtain values that can be about one order of magnitude larger than the standard model predictions. Our final results are comparable with the recent experimental observations at D0 and CDF, but they are still about a factor of 5 smaller than the recently measured dimuon asymmetry from D0.