A role of parton charges and masses in the exclusive photon-photon   production of meson pairs
  The exclusive photon-photon production of the $K$-meson pairs has been analyzed within the partonic model of QCD for the kinematical conditions of BELLE experiment. The cross section dependences on partonic masses, charges, and a shape of $K$-meson wave function have been studied for the process under discussion. 
A. V. Berezhnoy, A. K. Likhoded