Flavor-changing neutral current in production and decay of pseudoscalar mesons in a type III two-Higgs-doublet-model with four-texture Yukawa couplings

TL;DR

This paper investigates flavor-changing neutral currents in pseudoscalar meson production and decay within a type III two-Higgs-doublet-model, highlighting constraints on quark and lepton flavor-violating Yukawa couplings from experimental data.

Contribution

It provides a comprehensive analysis of flavor-violating processes in a general 2HDM-III, emphasizing the role of tree-level Higgs-mediated FCNCs and deriving constraints on Yukawa couplings.

Findings

Quark sector flavor-violating parameters are strongly constrained by data.

Leptonic sector flavor-violating parameters are less constrained.

Complementary information on Yukawa couplings is obtained from different decay channels.

Abstract

We study flavor violating processes in the production or decay of a neutral pseudoscalar meson $P^0$ in the framework of a general two Higgs Doublet Model type III (2HDM-III). We use a version of the model where Yukawa interactions of neutral Higgs bosons allow for flavor change at the tree-level, but conserves CP symmetry. We focus on all possible $\tau^{\pm} \to l^{\pm}P^0 $ and $P^0 \to l^+l'^-$ decay channels, where $l,l'$ are charged leptons. We find that these processes provide complementary information on quark and lepton FCNC Yukawa couplings. In particular flavor violating parameters in the quark sector, $\chi_{sb}$ and $\chi_{db}$, are significantly constrained by present experimental data, whereas the corresponding parameters in the leptonic sector are less constrained.