Leptoproduction of J/ψ

Details Leptoproduction of J/ψ Leptoproduction of J/ψ

1998-10-26

arxiv.org/abs/hep-ph/9810487v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 2 figures, Talk given at XXIX International Conference on High Energy Physics, Vancouver

Scientific paper

I review the status of the extraction of NRQCD color-octet $J/\psi$ production matrix elements. Large theoretical uncertainties in current extractions from hadroproduction and photoproduction are emphasized. Leptoproduction of $J/\psi$ is calculated within the NRQCD factorization formalism. Color-octet contributions dominate the cross section, allowing for a reliable extraction of $<{\cal O}_8^{J/\psi}(^1S_0)>$ and $<{\cal O}_8^{J/\psi}(^3P_0)>$. A comparison with preliminary data from the H1 collaboration shows that leading order color-octet mechanisms agree with the measured total cross section for $Q^2 > 4m_c^2$, while the color-singlet model underpredicts the cross section by a factor of 5.

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