Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-05-09
Phys.Lett.B570:39-45,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 2 eps figures, LaTeX
Scientific paper
10.1016/j.physletb.2003.07.006
Exclusive quarkonium pair production in electron-positron collisions is studied in non-relativistic QCD. The obtained cross section for J/\psi + \eta_c production in the leading order is confronted against the recent measurements by the Belle Collaboration at KEKB. It is shown that a large renormalization K-factor is necessary to explain the experimental data. We point out that the J^{PC}=0^{-+} nature of the hadronic systems that are assigned to be \eta_c should be tested by the triple angular distributions in terms of the scattering angle, and, polar and azimuthal angles of J/\psi into leptons. We further study J/\psi + J/\psi and \Upsilon + \Upsilon productions at LEP energies. Although the axial-vector couplings of the Z-boson to charm and bottom quarks allow production of such pairs when one of them is polarised transversally and the other longitudinally, we find that the integrated luminosity at Z pole accumulated by LEP is not large enough to observe the exclusive pair production of quarkonium.
Hagiwara Kaoru
Kou Emi
Qiao Cong-Feng
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