Article (Published version) (222 Kb) - 
Free accessOther version: http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.102.242001
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Scientific Article
unige:38551 
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Observation of Exclusive Charmonium Production and γγ -> μ+μ− in pp Collisions at s√=1.96 TeV |
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| Collaboration | With : Clark, Allan Geoffrey / Garcia Navarro, Jose Enrique / Hamilton, Andrew / Vallecorsa, Sofia / Wu, Xin | |
| Published in | Physical review letters. 2009, vol. 102, no. 24, 242001 | |
| 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 γγ→μ+μ− in pp¯ 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 χc0→J/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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Article (Published version) (222 Kb) - Free access Other version: http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.102.242001 |
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| Structures | ||
| Citation (ISO format) | CDF COLLABORATION. Observation of Exclusive Charmonium Production and γγ -> μ+μ− in pp Collisions at s√=1.96 TeV. In: Physical review letters, 2009, vol. 102, n° 24, p. 242001. doi: 10.1103/PhysRevLett.102.242001 https://archive-ouverte.unige.ch/unige:38551 |
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