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We study $J/\Psi$ production at photon-photon colliders, which can berealised with Compton scaterring of laser photons at $e^+e^-$ colliders. Wefind that the production rate through the color-octet channel is comparable tothat through the color-singlet channel. Experimentally the two mechanisms canbe studied separately because the processes have different signals.Comment: 9 pages, 3 Postscript figure

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

<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 at photon-photon colliders as a probe of the color octet mechanism

J/ψproduction at photon-photon colliders as a probe of the color octet mechanism