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Exclusive Double-Charmonium Production from e^+ e^- Annihilation into Two Virtual Photons | | Geoffrey T. Bodwin
; Eric Braaten
; Jungil Lee
; | | Date: |
24 Dec 2002 | | Journal: | Phys.Rev. D67 (2003) 054023 | | Affiliation: | Argonne), Eric Braaten (Ohio State & Fermilab), Jungil Lee (Korea U | | Abstract: | 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. Generically, 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 alpha^2/alpha_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/psi + J/psi at the B factories is larger than that for J/psi + eta_c. | | Source: | arXiv, hep-ph/0212352 | | Services: | Forum | Review | PDF | Favorites | |
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