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We use the color-octet mechanism combined with the two gluon exchange modelfor the diffractive $J/\psi$ production in resolved photon processes. In theleading logarithmic approximation in QCD, we find that the diffractive $J/\psi$production cross section is related to the off-diagonal gluon density of theproton, the gluon density of the photon and to the nonperturbative color-octet$^3 S_{1}^{(8)}$ matrix element of $J/\psi$. The cross section is found to bevery sensitive to the gluon density of the photon. As a result, this processmay provide a wide window for testing the two-gluon exchange model, studyingthe nature of hard diffractive factorization breaking and may be particularlyuseful in studying the gluon distribution of the photon. And it may also be agolden place to test the color-octet mechanism proposed by solving the$\psi'(J/\psi)$ surplus problem at the Tevatron.Comment: Revtex, 10 pages, 4 PS figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Diffractive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>production through the color-octet mechanism in resolved photon processes at DESY HERA

DiffractiveJ/ψproduction through the color-octet mechanism in resolved photon processes at DESY HERA