CP Violation in B Decays in a 2-Higgs Doublet Model for the Top Quark

TL;DR

This paper investigates CP violation effects in B decays within a specific two-Higgs doublet model that treats the top quark uniquely, revealing significant deviations from the Standard Model and potential observable electric dipole moments.

Contribution

It introduces a novel 2HDM framework with unique CP violation features affecting B decays and neutron EDM, differing from previous models with natural flavor conservation.

Findings

CP asymmetry in B to J/psi K_S can differ significantly from SM predictions.

The model allows a wide range of the SM phase in B decays.

Potentially large neutron electric dipole moment close to experimental limits.

Abstract

In the absence of natural flavor conservation, multi-Higgs doublet models generally contain new sources of CP violation and anomalous charged Higgs Yukawa couplings. We present a charged-Higgs CP violation study of one such two-Higgs doublet model (2HDM) which treats the top quark differently from the other quarks. The phenomenological implications for the K-Kbar system and for B decays differ significantly from those of the standard model (SM) and of the 2HDM's with natural flavor conservation. In particular, the SM phase in this model could take a wide range of values, and the CP asymmetry in the "gold-plated" decay mode B to J/psi K_S could be quite different from and even of opposite sign relative to the SM prediction. A new mechanism is also noted for generating a large neutron electric dipole moment which is close to the present experimental limit.