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Observation of Diffractive J/ψ Production at the Fermilab Tevatron

CollaborationWith : Clark, Allan Geoffrey / Kambara, Hisanori / Speer, Thomas / Strumia Michelini, Federica / Wu, Xin
Published in Physical review letters. 2001, vol. 87, no. 24, 241802
Abstract We report the first observation of diffractive J/ψ(→μ+μ−) production in pp collisions at s√=1.8TeV. Diffractive events are identified by their rapidity gap signature. In a sample of events with two muons of transverse momentum pμT>2GeV/c within the pseudorapidity region |η|<1.0, the ratio of diffractive to total J/ψ production rates is found to be RJ/ψ=[1.45±0.25]%. The ratio RJ/ψ(x) is presented as a function of x-Bjorken. By combining it with our previously measured corresponding ratio Rjj(x) for diffractive dijet production, we extract a value of 0.59±0.15 for the gluon fraction of the diffractive structure function of the proton.
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CDF COLLABORATION. Observation of Diffractive J/ψ Production at the Fermilab Tevatron. In: Physical review letters, 2001, vol. 87, n° 24, p. 241802. doi: 10.1103/PhysRevLett.87.241802 https://archive-ouverte.unige.ch/unige:37993

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Deposited on : 2014-06-23

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