Low-energy effects of Charged Higgs with general Yukawa couplings

Abstract

We study a model with two Higgs doublets where FCNC are allowed at tree-level. In this model, the interactions of charged Higgs with fermions ($H^\pm f \bar{f'}$), include a term that is not proportional to the fermion masses, which we constraint using the following low-energy processes: i) tau decays ($τ\to ν_τ eν_e, ν_τμν_μ, ν_τπ$), ii) leptonic decays of pseudoscalar mesons ($π, K \to \ellν_{\ell}$) and iii) semileptonic b-decays. With these constraints it is possible to make predictions; we illustrate this by presenting the rates for the (FCNC) decay $c\to u+γ$, the (second class-current) decay $τ\to ν_τ+ ηπ$, and also the theoretical value of the neutron life-time.