B physics and Extended Higgs sectors (Tauonic B decays and two Higgs doublet models)

TL;DR

Recent experimental anomalies in tauonic B decays suggest potential new physics beyond the standard model, with two Higgs doublet models allowing flavor-changing neutral currents providing a consistent explanation.

Contribution

The paper analyzes tauonic B decay anomalies within extended Higgs sector models, highlighting the viability of models with FCNC over those without.

Findings

Models without tree-level FCNC are unlikely to explain the data.

Models allowing FCNC are consistent with experimental results.

Experimental deviations hint at new physics in Higgs sector extensions.

Abstract

Recent experimental results on exclusive semi-tauonic B meson decays show sizable deviations from the standard model prediction, while the recent result on pure-tauonic decay reduces the deviation from the prediction. These results suggest an indirect evidence of new physics in which the structure of the relevant weak charged interaction may differ from that of the standard model. We study these tauonic B decays in the context of extensions of the Higgs sector. As a result, we find that two Higgs doublet models without tree-level FCNC are unlikely to explain the present experimental data while those allowing FCNC are consistent with the data.