J/Ψproduction, χ polarization and Color Fluctuations
L. Gerland, L. Frankfurt, M. Strikman, H. Stöcker, W. Greiner
Abstract
The hard contributions to the heavy quarkonium-nucleon cross sections are calculated based on the QCD factorization theorem and the nonrelativistic quarkonium model. We evaluate the nonperturbative part of these cross sections which dominates at sNN≈ 20 GeV at the Cern Super Proton Synchrotron (SPS) and becomes a correction at sNN≈ 6 TeV at the CERN Large Hadron Collider (LHC). production at the CERN SPS is well described by hard QCD, when the larger absorption cross sections of the χ states predicted by QCD are taken into account. We predict an A-dependent polarization of the χ states. The expansion of small wave packets is discussed.
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