Phys. Rev. Lett. 90, 162001 (2003) [4 pages]e+e- Annihilation into J/ψ+J/ψSee Also: Erratum Received 12 December 2002; published 25 April 2003 Recent measurements by the Belle Collaboration of the exclusive production of two charmonia in e+e- annihilation differ substantially from theoretical predictions. We suggest that a significant part of the discrepancy can be explained by the process e+e-→J/ψ+J/ψ. Because the J/ψ+J/ψ production process can proceed through fragmentation of two virtual photons into two cc̅ pairs, its cross section may be larger than that for J/ψ+ηc by about a factor of 3.7, in spite of a suppression factor α2/αs2 that is associated with the QED and QCD coupling constants. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.162001
DOI:
10.1103/PhysRevLett.90.162001
PACS:
13.66.Bc, 12.38.Bx, 14.40.Gx
See AlsoErratum: Geoffrey T. Bodwin, Eric Braaten, and Jungil Lee, Erratum: e+e- Annihilation into J/ψ+J/ψ [Phys. Rev. Lett. 90, 162001 (2003)], Phys. Rev. Lett. 95, 239901 (2005). |
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