Estimates of the gluon concentrations in the confining SU(3)-Yang-Mills   field for the first three states of charmonium
  The estimates of the gluon concentrations in the classical SU(3)-Yang-Mills field modelling confinement are given for the first three states of charmonium whose spectrum is tuned by calculating electromagnetic transitions among the mentioned levels in dipole approximation. For comparison the corresponding estimates for the photon concentration in the ground state of positronium (parapositronium and orthopositronium) are also adduced. 
Yu. P. Goncharov (Sankt-Petersburg State Polytechnical University,   Russia) A. A. Bytsenko (Londrina University, Brazil)