Abstract
In this paper, the twist-3 distribution amplitude of the quark-antiquark-gluon Fock state in the ${\ensuremath{\eta}}_{c}$ meson is studied. To calculate the moments of this distribution amplitude, QCD sum rules are applied. Using the results of the calculation, the model of this distribution amplitude is built. In addition, nonrelativistic QCD matrix elements that determine the properties of the quark-antiquark-gluon Fock state are determined. In particular, the following properties have been calculated: probability amplitude to find the quark-antiquark pair in the color-octet state, fraction of momentum carried by gluon, relative velocity of the color-octet quark-antiquark pair.
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