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Presented here is a study of the large p_T J/psi production in harddiffractive process by the pomeron exchange at the Fermilab Tevatron. We findthat this process (p\bar p \to p+J/psi+X) can be used to probe the gluoncontent of the pomeron and to measure the gluon fraction of the pomeron. Andthe diffractive direct J/psi production can also provide another crucial testfor the color-octet fragmentation mechanism. Using the renormalised pomeronflux factor D\approx 1/9, the single diffractive J/psi production cross sectionat large p_T (\geq 8GeV) is found to be of order of 0.01 nb, and the ratio ofthe single diffractive to the non-diffractive J/psi production is 0.65\pm 0.15%for the gluon fraction f_g=0.7\pm 0.2.Comment: 13 pages, 6 Postscript 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 as a probe of the gluon component in the Pomeron

DiffractiveJ/ψproduction as a probe of the gluon component in the Pomeron