Exclusive J/ψProductions at e^+ e^- Colliders

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dc.creatorHagiwara, K.
dc.creatorKou, E.
dc.creatorQiao, C. -F.
dc.date2003-05-09
dc.date.accessioned2026-07-07T10:48:46Z
dc.date.available2026-07-07T10:48:46Z
dc.descriptionExclusive quarkonium pair production in electron-positron collisions is studied in non-relativistic QCD. The obtained cross section for J/ψ+ η_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 η_c should be tested by the triple angular distributions in terms of the scattering angle, and, polar and azimuthal angles of J/ψinto leptons. We further study J/ψ+ J/ψand Υ+ Υproductions 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.
dc.description11 pages, 2 eps figures, LaTeX
dc.identifierhttps://arxiv.org/abs/hep-ph/0305102
dc.identifierhttp://arxiv.org/abs/hep-ph/0305102
dc.identifierPhys.Lett.B570:39-45,2003
dc.identifierdoi:10.1016/j.physletb.2003.07.006
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/183995
dc.subjectHigh Energy Physics - Phenomenology
dc.titleExclusive J/ψProductions at e^+ e^- Colliders
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