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![Thumbnail](/bitstream/handle/1721.1/51997/Aaltonen-2009-Observation%20of%20Exclu.pdf.jpg?sequence=4&isAllowed=y)
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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
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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
2009-06Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
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