J/Psi production in direct and resolved gamma gamma collisions
classification
✦ hep-ph
keywords
gammaproductioncollisionsdirectnrqcdresolvedallowscalculate
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The production of J/Psi mesons in gamma gamma collisions allows for a test of factorization in color-octet processes as predicted by NRQCD and observed at the Tevatron. We calculate the cross sections for J/Psi production with direct and resolved photons, including also the feed-down from chi_{cJ} and Psi' decays. Our NRQCD predictions are nicely confirmed by recent data from the DELPHI collaboration at CERN LEP2.
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