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Observation of J/ψ production by neutrinos in the calorimeter of the CHORUS detector exposed to the CERN SPS wide-band ν μ beam is reported. A spectrum-averaged cross section σ J/ψ =(6.3±3.0)×10 −41 cm 2 is obtained for 20 GeV ⩽E ν ⩽ 200 GeV. The data are compared with the theoretical model based on the QCD Z-gluon fusion mechanism.
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