Estimates for parameters and characteristics of the confining   SU(3)-gluonic field in the ground state of toponium: Relativistic and   nonrelativistic approaches
  The confinement mechanism earlier proposed by author is applied to describe the (possible) ground state of toponium $\eta_t$. For this aim the nonperturbative consistent approach is elaborated in both relativistic and nonrelativistic cases. The study entails estimates for parameters of the confining SU(3)-gluonic field in the above quarkonium, those estimates being also consistent with possible width of decay $\eta_t\to2\gamma$. The corresponding estimates of the gluon concentrations, electric and magnetic colour field strengths are also adduced for the mentioned field at the scales of toponium. 
Yu. P. Goncharov (Sankt-Petersburg State Polytechnical University,   Russia)