CP asymmetries of ${\overline B}\to X_s/X_d\gamma$ in models with three Higgs doublets

TL;DR

This paper investigates CP asymmetries in B meson decays within a three-Higgs-doublet model, showing potential deviations from the Standard Model that could be observed at BELLE II, indicating new physics.

Contribution

It demonstrates that three CP asymmetries in B decays can reach current experimental limits within a three-Higgs-doublet model, highlighting potential signals of physics beyond the Standard Model.

Findings

CP asymmetries can be as large as current experimental limits.

${ m A}_{CP}$ for ${ar B} o X_{s+d} o ext{gamma}$ can be effectively zero in SM.

A 2.5 ext{ extperthousand} or larger asymmetry would indicate new physics.

Abstract

Direct CP asymmetries (${\cal A}_{CP}$) in the inclusive decays of ${\overline B}\to X_s\gamma$ and ${\overline B}\to X_{s+d}\gamma$ of the order of $1\%$ will be probed at the BELLE II experiment. In this work, three such asymmetries are studied in the context of a three-Higgs-doublet model (3HDM), and it is shown that all three ${\cal A}_{CP}$ can be as large as the current experimental limits. Of particular interest is ${\cal A}_{CP}$ for ${\overline B}\to X_{s+d}\gamma$, which is predicted to be effectively zero in the Standard Model (SM). A measurement of $2.5\%$ or more for this observable with the full BELLE II data would give $5\sigma$ evidence for physics beyond the SM. We display parameter space in the 3HDM for which such a clear signal is possible.