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Observation of Exclusive Charmonium Production and gamma gamma -->mu+mu- in pp-bar Collisions at sqrt[s]=1.96 TeV

Author(s)
Xie, Si; Knuteson, Bruce O.; Henderson, C.; Hahn, Kristian Allan; Gomez-Ceballos, Guillelmo; Choudalakis, Georgios; Paus, Christoph M. E.; Makhoul, Khaldoun; Goncharov, Maxim; Bauer, Gerry P; ... Show more Show less
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Alternative title
Observation of Exclusive Charmonium Production and γγ→μ[superscript +]μ[superscript]- in pp̅ Collisions at √s=1.96  TeV
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
In CDF we have observed the reactions p+p̅ →p+X+p̅ , with X being a centrally produced J/ψ, ψ(2S), or χ[subscript c0], and γγ→μ[superscript +]μ[superscript -] in pp̅ collisions at √s=1.96  TeV. The event signature requires two oppositely charged central muons, and either no other particles or one additional photon detected. Exclusive vector meson production is as expected for elastic photoproduction, γ+p→J/ψ(ψ(2S))+p, observed here for the first time in hadron-hadron collisions. We also observe exclusive χ[subscript c0]→J/ψ+γ. The cross sections dσ/dy|[subscript y=0] for J/ψ, ψ(2S), and χ[subscript c0] are 3.92±0.25(stat)±0.52(syst)  nb, 0.53±0.09(stat)±0.10(syst)  nb, and 76±10(stat)±10(syst)  nb, respectively, and the continuum is consistent with QED. We put an upper limit on the cross section for Odderon exchange in exclusive J/ψ production.
Date issued
2009-06
URI
http://hdl.handle.net/1721.1/51997
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
CDF Collaboration et al. “Observation of Exclusive Charmonium Production and gamma gamma -->mu+mu- in pp-bar Collisions at s=1.96 TeV.” Physical Review Letters 102.24 (2009): 242001. © 2009 The American Physical Society
Version: Final published version
ISSN
0031-9007

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