Production of $\eta_Q$ meson at LHC
  The paper is devoted to theoretical consideration of inclusive $\eta_{c,b}$ meson production at LHC. It is shown that existing experimental data on $\eta_c$ meson production at LHCb detector can be described in the framework of NRQCD formalism and color-singlet component with phenomenological value of matrix element $|R(0)|^2$ gives main contribution. Using this model we present theoretical prediction for integrated cross sections and transverse momentum distributions for inclusive $\eta_c$ production at other LHC detectors. The case of $\eta_b$ meson production at LHC is also considered. 
A. K. Likhoded, A. V. Luchinsky, S. V. Poslavsky
hep-ph hep-ex