Properties of the quark-antiquark-gluon Fock state in the \eta_c meson
V. V. Braguta
TL;DR
This paper investigates the twist-3 distribution amplitude of the quark-antiquark-gluon Fock state in the ta_c meson using QCD sum rules, providing new insights into its internal structure and properties.
Contribution
It introduces a model for the twist-3 distribution amplitude of the ta_c meson's quark-antiquark-gluon Fock state and calculates related NRQCD matrix elements.
Findings
Probability amplitude for color octet state
Mean gluon energy and momentum fraction
Relative velocity of quark-antiquark pair
Abstract
In this paper the twist-3 distribution amplitude of the quark-antiquark-gluon Fock state in the \eta_c meson is studied. To calculate the moments of this distribution amplitude QCD sum rules is applied. Using the results of the calculation the model of this distribution amplitude is built. In addition NRQCD matrix elements which determine the properties of the quark-antiquark-gluon Fock state are determined. In particular, the probability amplitude to find the quark-antiquark pair in the color octet state, the mean gluon energy and the fraction of momentum carried by gluon, the relative velocity of the color-octet quark-antiquark-pair are calculated.
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