(J/, J/), and (c, c) production through two intermediate photons in electron-positron annihilation at B-factories

We study the processes, e^- e^+ ^* ^* J/ +J/, and e^- e^+ ^* ^* c+ c at s=10. 6 GeV in the framework of 4 4 Bethe-Salpeter equation. For J/+J/ production, the dominant contribution is through fragmentation process, while for c+c production, the quark rearrangement diagrams contribute. Our results of cross section for J/+J/ and (2S) + (2S) are compatible with the experimental upper limits set by Belle Collaboration, while in the absence of experimental data for c (1S) +c (1S), and c (2S) +c (2S) production, we have given theoretical prediction of their cross sections, and compared with NRQCD prediction.