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Phys. Rev. D 54, 929 - 937 (1996)

Color-octet J / ψ production in the ϒ decay

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Kingman Cheung *
Center for Particle Physics, University of Texas at Austin, Austin, Texas 78712

Wai-Yee Keung †
Physics Department, University of Illinois at Chicago, Illinois 60607-7059 and Fermilab, P.O. Box 500, Batavia, Illinois 60510

Tzu Chiang Yuan ‡
Davis Institute for High Energy Physics, University of California at Davis, Davis, California 95616

Received 6 March 1996

The direct production rate of ψ in the ϒ decay is shown to be dominated by the process ϒ→ggg* followed by g*→ψ via the color-octet mechanism proposed recently to explain the anomalous prompt charmonium production at the Fermilab Tevatron. We show that this plausibly dominant process has a branching ratio compatible with the experimental data. Further experimental study in this channel is important to test the significance of the color-octet component of the cc̅ pair inside the ψ system.


©1996 The American Physical Society

URL: http://link.aps.org/abstract/PRD/v54/p929
DOI: 10.1103/PhysRevD.54.929
PACS: 13.25.Gv, 12.38.Bx, 14.40.Gx

* Electronic address (internet): cheung@utpapa.ph.utexas.edu
† Electronic address (internet): keung@fnalv.fnal.gov
‡ Electronic address (internet): yuantc@ucdhep.ucdavis.edu

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