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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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dc.contributor University of Helsinki, Department of Physics en
dc.contributor University of Helsinki, Helsinki Institute of Physics en
dc.contributor University of Helsinki, Department of Physics en
dc.contributor University of Helsinki, Helsinki Institute of Physics (HIP) (-2009) en
dc.contributor University of Helsinki, Department of Physics en
dc.contributor University of Helsinki, Department of Physics en
dc.contributor.author Aaltonen, T.
dc.contributor.author Mehtala, P.
dc.contributor.author Orava, R.
dc.contributor.author Maki, T.
dc.contributor.author Saarikko, H.
dc.contributor.author Osterberg, K.
dc.contributor.author CDF collaboration
dc.date.accessioned 2011-01-04T09:45:01Z
dc.date.available 2011-01-04T09:45:01Z
dc.date.issued 2009
dc.identifier.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 . en
dc.identifier.issn 0031-9007
dc.identifier.other PURE: 9383803
dc.identifier.other ArXiv: http://arxiv.org/abs/0902.1271v4
dc.identifier.uri http://hdl.handle.net/10138/24421
dc.description.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. en
dc.format.extent 7
dc.language.iso eng
dc.publisher American Institute of Physics
dc.relation.ispartof Physical Review Letters
dc.relation.uri http://prl.aps.org/pdf/PRL/v102/i24/e242001
dc.subject hep-ex en
dc.subject 114 Physical sciences en
dc.title Observation of Exclusive Charmonium Production and γγ→μ+μ- in pp̅ Collisions at √s=1.96  TeV en
dc.title.alternative Observation of exclusive charmonium production and gamma+gamma to mu+mu- in p+pbar collisions at sqrt{s} = 1.96 TeV en
dc.type A1 Refereed journal article
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevLett.102.242001
dc.type.dcmitype document
dc.type.uri info:eu-repo/semantics/article

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