${\eta }_c$ production associated with light hadrons at the B-factories and the future super B-factories

Abstract

We present a complete study of the associated production of the ${\eta }_c$ meson with light hadrons in $e^{+}{e}^{-}$ collisions at the B-factory energy, which is demonstrated to be one of the best laboratories for testing the colour-octet (CO) mechanism. The colour-siglet contributions are evaluated up to $O({\alpha }^2{\alpha }_s^3)$ while the CO ones are evaluated up to $O({\alpha }^2{\alpha }_s^2)$. For the first time, the angular distribution of the ${}^1{S}_0^{[8]}$ production is studied at QCD next-to-leading order. We find that the ${}^1{S}_0^{[8]}$ channel dominate the total cross section, while the ${}^1{P}_1^{[8]}$ one exhibit its importance in the angular distribution, which turns out to be downward going with respect to $\cos \theta$. This can be considered as the most distinct signal for the CO mechanism.

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Cited by in corpus (4)

• QCD leading order study of the $J/\psi$ leptoproduction at HERA within the nonrelativistic QCD framework
• Kinematic distributions of the ${\eta }_c$ photoproduction in $ep$ collisions within the nonrelativistic QCD framework
• Inclusive productions of ${\rm Y}(1S,2S,3S)$ and ${\chi }_b(1P,2P,3P)$ via the Higgs boson decay
• Statistical analysis of the azimuthal asymmetry in the $J/\psi$ leptoproduction in unpolarized $ep$ collisions