Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-11-05
Eur.Phys.J.C62:499-509,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 6 figures, some typos are corrected, version for publish in EPJC
Scientific paper
10.1140/epjc/s10052-009-1046-7
In this paper, the quark distribution amplitudes of 1S and 2S heavy quarkonium states are studied in terms of Gaussian-type wave functions. The transverse momenta $p_\perp$ integrals of the formulae for the decay constant are performed analytically. Then the quark distribution amplitudes are obtained. In addition, the $\xi$-moments are also calculated. After fixing the relevant parameters appearing in the quark distribution amplitude, the curves of the quark distribution amplitude for 1S and 2S heavy quarkonium states are plotted. Finally, the numerical results of this approach are compared with the other theoretical predictions.
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