PoS - Proceedings of Science
Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T08 Flavour Physics and CP Violation
$b \to s\gamma$, electron EDM, and electroweak baryogenesis: a study in 2HDM
G.W.S. Hou
Full text: pdf
Pre-published on: February 21, 2024
Published on: March 21, 2024
We study inclusive $b \to s\gamma$ decay in the context of electron EDM and baryogenesis. The {\it general} 2HDM (i.e.~without $Z_2$) that possesses an extra set of Yukawa matrices can drive electroweak baryogensis via $\lambda_t {\rm Im}\rho_{tt}$, where $\rho_{tt}$ is the extra diagonal top Yukawa coupling, with the $e$EDM constraint evaded by an exquisite flavor cancellation mechanism. We touch upon the current status of direct search for exotic $H$, $A$ and $H^+$ scalars at the LHC, while for the plethora of flavor observables in $g$2HDM, we focus on $b\to s\gamma$, pointing out {\it chiral} enhancement of a $\rho_{tt}\rho_{bb}$ effect in {\it g}2HDM, which can bring in a CPV phase. We first explore the inclusive ${\cal B}(b \to s\gamma)$ rate, then showcase the progress that Belle~II can make in the future, illustrating a potential 3$\sigma$ effect for the inclusive $B^+ \to X_s^+\gamma$ vs $B^0 \to X_s^0\gamma$ CPV rate difference, $\Delta A_{\rm CP}$. Especially if $e$EDM emerges swiftly, perhaps one should pursue further upgrade beyond Belle~II.
DOI: https://doi.org/10.22323/1.449.0363
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.