Photoproduction of J/Σ in association with a cc pair

Based on the color-singlet model, we investigate the photoproduction of J/Sigma associated with a cc pair with all subprocesses including the direct, single-resolved, and double-resolved channels. The amplitude squared of these subprocesses are obtained analytically. By choosing corresponding parameters, we give theoretical predictions for the J/Sigma transverse momentum and rapidity distributions both at the LEPII and at the future photon colliders for these subprocesses. The numerical results show that at the LEPII these processes cannot give enough contributions to account for the experimental data, and it indicates that the color-octet mechanism may still be needed. At the photon collider with the laser backscattering photons, the resolved photon channel will dominate over the direct one in small and moderate p(t) regions with large s. For their rapidity distribution with the laser backscattering photons, the resolved processes will be dominant in the whole region -2 < y < 2. By measuring the J/Sigma production associated with a cc pair, this process can be separated from the inclusive J/Sigma production and may provide a new chance to test the color-singlet contributions.