CP-Violation in the 3-Higgs Doublet Model: CP-Asymmetries from Charged Higgs Bosons and Electric Dipole Moments

TL;DR

This paper explores CP-violation in a 3-Higgs Doublet Model, proposing observable asymmetries and analyzing constraints from EDMs, B-meson decays, and collider searches to identify viable parameter regions.

Contribution

It introduces a new CP-violating source in the charged Higgs sector of the 3HDM and analyzes its implications for low-energy CP asymmetries and experimental constraints.

Findings

Potential 2.5% or greater CP asymmetry in B decays detectable by BELLE II

Current EDM measurements significantly restrict the model's parameter space

Viable regions satisfy EDM, B decay, collider, and theoretical bounds

Abstract

We propose a CP-violating source in the charged Higgs sector of a 3-Higgs Doublet Model (3HDM) that will contribute to three CP-asymmetry observables for low energy processes. In the context of such a 3HDM, a measurement of one of the specific asymmetry observables (i.e., $\bar{B} \to X_{s+d} \gamma$) could obtain up to 2.5% or more, which would give a 5$\sigma$ evidence for physics Beyond the SM (BSM) from the full BELLE II data set. In addition to these CP-violating observables, the current measurements of Electron Dipole Moments (EDMs) constrain the available parameter region of the CP-violating 3HDM. In this work, we perform a thorough analysis of the parameter space of it to find the regions that satisfy EDMs, $\bar{B} \to X_s \gamma$, direct collider searches for charged Higgs bosons as well as theoretical bounds.