Abstract
Considering the possibility to build an e + e − collider at the energies around Z-boson resonance with a luminosity so high as L ∝ 1034 cm−2 s−1 (even higher) and the abilities of a modern synthesis detector, we systematically calculate the exclusive two body processes of the heavy quarkonium production: e + e − annihilates into a heavy quarkonium and a photon, involving the initial state radiation (i.e. ISR) cases, at the energies around the Z-boson resonance. Since the couplings of Z-boson to quarks contain an axial vector term as well as a vector one, a charmonium such as J/ψ or η c or h c or χ cJ …, or a bottomonium such as ϒ or η b or h b or χ bJ …, associating with a photon, may be produced respectively via Z-boson annihilation. If we call such a collider with so high luminosity and running around the Z-boson resonance as a Z-factory, then our results obtained here indicate that experimental studies of the various heavy quarkona (their ground and excited states) via the two-body processes at a Z-factory have outstanding advantages, especially, the production of the possible states with quantum numbers J PC = 1−− via ISR.
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Chang, C., Wang, J. & Wu, X. Production of a heavy quarkonium with a photon or via ISR at Z peak in e + e − collider. Sci. China Phys. Mech. Astron. 53, 2031–2036 (2010). https://doi.org/10.1007/s11433-010-4142-7
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DOI: https://doi.org/10.1007/s11433-010-4142-7