η − η′ mixing and decays of mesons with heavy quarks

The inclusion of elastic rescattering and annihilation of quark–antiquarks pairs in final state can explain the [Formula: see text]-dependency for cross-section ratio of [Formula: see text] and [Formula: see text] mesons in charge exchange reaction. The estimation for mixing angle [Formula: see text] with isoscalar states [Formula: see text] and hidden strangeness [Formula: see text] has been obtained. The consistent description of [Formula: see text] and [Formula: see text] meson outputs in [Formula: see text], [Formula: see text] and [Formula: see text] decays was also considered.