Photoproduction of $J/\psi$ in association with a $c\bar{c}$ pair

Abstract

Based on the color-singlet model, we investigate the photoproduction of $J/\psi$ associated with a $c\bar{c}$ 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 $J/\psi$ transverse momentum distributions both at the LEPII and at the future photon colliders for these subprocesses. The numerical results show that at the LEPII these processes can not 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 back scattering photons, the resolved photon channe will dominate over the direct one in small and moderate $p_t$ regions with large $\sqrt{s}$. By measuring the $J/\psi$ production associated with a $c\bar{c}$ pair, this process can be separated from the inclusive $J/\psi$ production and may provide a new chance to test the color-singlet contributions.

16 pages, 7 figures

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• QCD Corrections to the Color-singlet $J/\psi$ Production in Deeply Inelastic Scattering at HERA
• QCD leading order study of the $J/\psi$ leptoproduction at HERA within the nonrelativistic QCD framework
• Photoproduction of the heavy quarkonium at the ILC
• Photoproduction of the $B_c^{(\ast )}$ Meson at the LHeC
• The prompt $J/\psi$ production in Association with a $c\bar{c}$ Pair within the Framework of Non-relativistic QCD via photon-photon collision at the International Linear Collider
• NLO QCD Corrections for $J/\psi +c+\bar{c}$ Production in Photon-Photon Collision
• NLO QCD corrections to pseudoscalar quarkonium production with two heavy flavors in photon-photon collision
• P-wave excited $B_c^{\ast \ast }$ meson photoproduction at the LHeC
• Photoproduction of the $B_c$ meson at the future $e^{+}{e}^{-}$ colliders
• Statistical analysis of the azimuthal asymmetry in the $J/\psi$ leptoproduction in unpolarized $ep$ collisions