Color-singlet contribution to e{sup +}e{sup -}{yields}J/{psi}+X at the endpoint

Journal Article · Wed Aug 01 04:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.76.034005· OSTI ID:21027500

Leibovich, Adam K; Xiaohui, Liu ^[1]

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1. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States)

Recent observations of the J/{psi} spectrum produced in e{sup +}e{sup -} collisions at the {upsilon}(4S) resonance are in conflict with fixed-order calculations using the nonrelativsitic QCD effective theory (NRQCD). One problem is an enhancement in the cross section when the J/{psi} has maximal energy, due to large perturbative corrections (Sudakov logarithms). In a recent paper, the Sudakov logarithms in the color-octet contribution were summed by combining NRQCD with the soft-collinear effective theory. However, to be consistent, the color-singlet contributions must also be summed in the endpoint region which was not done in that paper. In this paper, we sum the leading logarithms in the color-singlet contribution to the J/{psi} production cross section. We find that the color-singlet cross section is suppressed near the endpoint compared to the fixed-order NRQCD prediction.

• OSTI ID: 21027500
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 3 Vol. 76; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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