Novel CP-violating Effects in B decays from Charged-Higgs in a Two-Higgs Doublet Model for the Top Quark

TL;DR

This paper investigates new CP-violating effects in B meson decays within a specific two-Higgs doublet model, revealing large asymmetries and mixing effects that could impact understanding of CP violation and the CKM matrix.

Contribution

It introduces a novel two-Higgs doublet model with new CP-violating phases and analyzes their effects on B decays, including sizable asymmetries and D-anti-D mixing.

Findings

Large direct-CP asymmetry in B+- to psi/J K+- decays.

Admissible D-anti-D mixing at the percent level.

Distinctive CP asymmetry patterns in B_d and B_s decays.

Abstract

We explore charged-Higgs cp-violating effects in a specific type III two-Higgs doublet model which is theoretically attractive as it accommodates the large mass of the top quark in a natural fashion. Two new CP-violating phases arise from the right-handed up quark sector. We consider CP violation in both neutral and charged B decays. Some of the important findings are as follows. 1) Large direct-CP asymmetry is found to be possible for B+- to psi/J K+-. 2) Sizable D-anti-D mixing effect at the percent level is found to be admissible despite the stringent constraints from the data on K-anti-K mixing, b to s gamma and B to tau nu decays. 3) A simple but distinctive CP asymmetry pattern emerges in decays of B_d and B_s mesons, including B_d to psi/J K_S, D+ D-, and B_s to D_s+ D_s-, psi eta/eta^prime, psi/J K_S. 4) The effect of D-anti-D mixing on the CP asymmetry in B+- to D/anti-D K+- and on the extraction of the angle gamma of the unitarity triangle from such decays can be significant.