Abstract
J/ψ production in deep inelasic electron–proton scattering is calculated in the framework of nonrelativistic quantum chromodynamics. All the calculated differential distributions, except for one, turn out to be very sensitive to the colour octet mechanism. The analytical results disagree with previous analyses, both for the colour singlet and colour octet channels. The theoretical predictions agree reasonably well with recent data taken by the H1 Collaboration at DESY HERA, significantly better than those obtained within the colour singlet model.
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