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Color-octet quarkonia production

Cho, Peter and Leibovich, Adam K. (1996) Color-octet quarkonia production. Physical Review D, 53 (1). pp. 150-162. ISSN 2470-0010. doi:10.1103/PhysRevD.53.150.

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Gluon fragmentation represents the dominant source of high energy prompt quarkonia at hadron colliders. Fragmentation approximations break down, however, when a quarkonium’s tranvserse momentum becomes comparable to its mass. In this paper we identify a large class of color-octet diagrams that mediate quarkonia production at all energies and reduce to the dominant set of gluon fragmentation graphs in the high p⊥ limit. They contribute to quarkonia differential cross sections at the same order as color-singlet diagrams and bring theoretical predictions for Υ and Ψ production at the Fermilab Tevatron into agreement with experimental measurements. Using recent CDF data we extract numerical values for bottomonia and charmonia color-octet matrix elements which are consistent with NRQCD scaling rules. We also find that quarkonia generated via the color-octet mechanism are strongly polarized at low as well as high energies. Spin alignment measurements can thus test the color-octet quarkonia production picture.

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Additional Information:©1996 The American Physical Society Received 25 May 1995 We have benefited from helpful discussions with many colleagues and friends. We wish to especially thank Eric Braaten, Michelangelo Mangano, Mikolaj Misiak, Ivan Muainich, Vaia Papadimitriou, David Politzer, Chris Quigg, Elizabeth Simmons, Sandip Trivedi, and Mark Wise for sharing their insight with ns. The work of P.C. was supported in part by the DuBridge Foundation and by the US. Dept. of Energy under DOE Grant No. DE-FG03-92-ER40701. The work of A.K.L. was supported in part by the U.S. Dept. of Energy under DOE Grant No. DE-FG03-92-ER40701.
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Deposited On:01 Jun 2006
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