Exclusive double-charmonium production from e +e - annihilation into two virtual photons

Geoffrey T. Bodwin, Jungil Lee, Eric Braaten

Research output: Contribution to journalArticlepeer-review

79 Citations (Scopus)


We calculate the contributions from QED processes involving two virtual photons to the cross sections for e +e - annihilation into two charmonium states with the same C parity. Genetically, the cross sections are three orders of magnitude smaller than those for charmonia with opposite C parity because they are suppressed by a factor of α 2/ α s 2. However, if both charmonia have quantum numbers J pc = 1 -, then there is a contribution to the cross section that involves the fragmentation of each photon into a charmonium. The fragmentation contribution is enhanced by powers of E beam/m c, the ratio of the beam energy to the charm-quark mass, and this enhancement can compensate for the suppression factor that is associated with the coupling constants. In particular, the predicted cross section for J/ψ+J/ψ at the B factories is larger than that for J/ψ + η c.

Original languageEnglish
Article number054023
JournalPhysical Review D
Issue number5
Publication statusPublished - 2003 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • General Physics and Astronomy
  • Nuclear and High Energy Physics
  • Mathematical Physics


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