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Observation of Exclusive Charmonium Production and γγ→μ+μ- in pp̅ Collisions at √s=1.96  TeV

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Title: Observation of Exclusive Charmonium Production and γγ→μ+μ- in pp̅ Collisions at √s=1.96  TeV
Author: Aaltonen, T.; Mehtala, P.; Orava, R.; Maki, T.; Saarikko, H.; Osterberg, K.; CDF collaboration
Citation: Aaltonen , T , Mehtala , P , Orava , R , Maki , T , Saarikko , H , Osterberg , K & CDF collaboration 2009 , ' Observation of Exclusive Charmonium Production and γγ→μ+μ- in pp̅ Collisions at √s=1.96  TeV ' , Physical Review Letters , vol 102 , no. 24 , pp. 242001 .
Belongs to series: Physical Review Letters
ISSN: 0031-9007
Abstract: In CDF we have observed the reactions p+p̅ →p+X+p̅ , with X being a centrally produced J/ψ, ψ(2S), or χc0, and γγ→μ+μ- 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 χc0→J/ψ+γ. The cross sections dσ/dy|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.
Peer review status: Peer reviewed
URI: http://hdl.handle.net/10138/24421
Date: 2009

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