Gluon and charm content of the [Formula presented] meson and instantons

Motivated by recent CLEO measurements of the (Formula presented) decay, we evaluate the gluon and charm content of the (Formula presented) meson using the interacting instanton liquid model of the QCD vacuum. Our main result is (Formula presented). It is very large due to the strong field of small-size instantons. We show that it provides quantitative explanations of the CLEO data on the (Formula presented) decay rate (as well as the inclusive process (Formula presented), via a virtual Cabibbo-unsuppressed decay into a (Formula presented) pair which then becomes (Formula presented). If so, a significant charm component may be present in other hadrons also: We briefly discuss the contribution of the charmed quark to the polarized deep-inelastic scattering on a proton.