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Observation of diffractive $J/\psi$ production at the Fermilab Tevatron

The CDF collaboration
Phys.Rev.Lett. 87 (2001) 241802, 2001

Abstract (data abstract)
CDF-Tevatron. First observation of diffractive J/psi production in P Pbar collisions at sqrt(s) = 1.8 TeV. Measurements done in the dimuon decay channel for the J/psi, where the two muons have a transverse momentum larger than 2 GeV/c within the pseudorapidity region |eta|<1.0 . Diffractive signal is extracted from events with a J/psi candidate and a rapidity gap (no particles nor photons detected) in the forward pseudorapidity range 2.4 < |eta| < 5.9. The obtained ratio of diffractive to total J/psi production rates is used together with the ratio for diffractive dijet production to extract the gluon fraction of the diffractive structure function of the proton. This extraction relies on the quark/gluon ratio in the proton GRV98LO parton disribution function The values in the second set of data were extracted from the figure in the article using xyscan software.

  • Table 1

    Data from P 5


    Diffractive to total J/psi production ratio.

  • Table 2

    Data from F 4


    Ratio of diffractive to total J/psi rate, per unit of the fractional momentum loss of the leading (anti)proton, and as...

  • Table 3

    Data from P 6


    Gluon fraction of the diffractive structure function of the (anti)proton.

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