Exclusive Double-Charmonium Production from e^+ e^- Annihilation into a Virtual Photon
Abstract
We calculate the exclusive cross sections for e^+ e^- annihilation into two charmonium states through a virtual photon. Purely electromagnetic contributions are surprisingly large, changing the cross sections by as much as 21%. The predicted cross section for J/psi + eta_c is about an order of magnitude smaller than a recent measurement by the BELLE Collaboration, although part of the discrepancy can be attributed to large relativistic corrections. The cross sections for S-wave + P-wave, P-wave + P-wave, and S-wave + D-wave charmonium states are also calculated. It may be possible to discover the D-wave state eta_{c2}(1D) at the B factories through the mode J/psi+\eta_{c2}, whose cross section is predicted to be about a factor of 10 smaller than J/psi + eta_c.
Cite
@article{arxiv.hep-ph/0211085,
title = {Exclusive Double-Charmonium Production from e^+ e^- Annihilation into a Virtual Photon},
author = {Eric Braaten and Jungil Lee},
journal= {arXiv preprint arXiv:hep-ph/0211085},
year = {2014}
}
Comments
22 pages, 2 figures, 3 tables, revised to correct errors in original version, Erratum to Phys. Rev. D article included as a separate file