1201.6064 (V. V. Braguta)

Properties of the quark-antiquark-gluon Fock state in the η_c meson    [PDF]

V. V. Braguta

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.

View original: http://arxiv.org/abs/1201.6064