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Observation of Exclusive Charmonium Production and γγμ+μ in pp¯ Collisions at s=1.96TeV

T. Aaltonen et al. (CDF Collaboration)
Phys. Rev. Lett. 102, 242001 – Published 15 June 2009
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Abstract

In CDF we have observed the reactions p+p¯p+X+p¯, with X being a centrally produced J/ψ, ψ(2S), or χc0, and γγμ+μ in pp¯ collisions at s=1.96TeV. 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+pJ/ψ(ψ(2S))+p, observed here for the first time in hadron-hadron collisions. We also observe exclusive χc0J/ψ+γ. The cross sections dσdy|y=0 for J/ψ, ψ(2S), and χc0 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.

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  • Received 16 February 2009

DOI:https://doi.org/10.1103/PhysRevLett.102.242001

©2009 American Physical Society

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See Also

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JR Minkel
Phys. Rev. Focus 23, 21 (2009)

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Vol. 102, Iss. 24 — 19 June 2009

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