  A leptonic $(\bar l l)$ decay of a heavy quark-antiquark bound state $T(\bar
QQ)$ with a Higgs-boson $H$ emission is investigated. The applying of the
well-known low-energy theorem to meson-Higgs coupling allows one to estimate
the probability of the decay $T(\bar QQ)\to \bar ll H$. The only a simple
version of the Standard Model extension containing two-Higgs doublet is
considered.
