ILC Workshop on Potential Experiments (ILCX2021)

CP asymmetries of B to X_{s,d} gamma in models with three Higgs doublets

28 Oct 2021, 19:20

20m

Room #2 (Zoom Meeting ID: 823 6921 2312)

Oral presentation using Zoom Session F: Higgs properties F-4: Higgs properties

Speaker

Tetsuo Shindou

Description

We study the prediction of the direct CP asymmetry in the inclusive decays of B to X_s gamma and B to X_{s+d} gamma in the context of a three-Higgs-doublet model(3HDM). The 3HDM is the simplest multi-doublet model such that the charged Higgs mixing includes a physical CP phase.
We show that the CP asymmetries can be as significant as the current experimental limit. In particular, the asymmetry for B to X_{s+d} gamma, which is effectively zero in the Standard Model, is interesting. A measurement of 2.5% or more for this observable with the full BELLE II data would give 5σ evidence for physics beyond the SM. We display parameter space in the 3HDM for which such a clear signal is possible.
The presentation is essentially based on the paper, A. G. Akeroyd, S. Moretti, T. Shindou and M. Song, Phys. Rev. D 103 (2021) no.1, 015035.

Presentation materials

ILCX2021.pdf