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Diffractive $J/ψ$ production through color-octet mechanism in resolved photon processes at HERA

Jia-Sheng Xu·Hong-An Peng
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Abstract

We use the color-octet mechanism combined with the two gluon exchange model for the diffractive $J/ψ$ production in resolved photon processes. In the leading logarithmic approximation in QCD, we find that the diffractive $J/ψ$ production cross section is related to the off-diagonal gluon density of the proton, the gluon density of the photon and to the nonperturbative color-octet $^3 S_{1}^{(8)}$ matrix element of $J/ψ$. The cross section is found to be very sensitive to the gluon density of the photon. As a result, this process may provide a wide window for testing the two-gluon exchange model, studying the nature of hard diffractive factorization breaking and may be particularly useful in studying the gluon distribution of the photon. And it may also be a golden place to test the color-octet mechanism proposed by solving the $ψ'(J/ψ)$ surplus problem at the Tevatron.

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Jia-Sheng Xu, Hong-An Peng. 1999-01-16. Diffractive $J/ψ$ production through color-octet mechanism in resolved photon processes at HERA. https://doi.org/10.1103/physrevd.60.094010

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