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In this paper, the quark distribution amplitudes of 1S and 2S heavyquarkonium states are studied in terms of Gaussian-type wave functions. Thetransverse momenta $p_\perp$ integrals of the formulae for the decay constantare performed analytically. Then the quark distribution amplitudes areobtained. In addition, the $\xi$-moments are also calculated. After fixing therelevant parameters appearing in the quark distribution amplitude, the curvesof the quark distribution amplitude for 1S and 2S heavy quarkonium states areplotted. Finally, the numerical results of this approach are compared with theother theoretical predictions.

Study of quark distribution amplitudes of 1S and 2S heavy quarkonium states