J/Ψproduction, $χ$ polarization and Color Fluctuations

Details J/Ψproduction, $χ$ polarization and Color Fluctuations J/Ψproduction, $χ$ polarization and Color Fluctuations

1998-03-17

arxiv.org/abs/nucl-th/9803034v2

Phys.Rev.Lett. 81 (1998) 762-765

Physics

Nuclear Physics

Nuclear Theory

13 pages REVTEX, 1 table, 2 PostScript, corrected some typos

Scientific paper

10.1103/PhysRevLett.81.762

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 $\sqrt{s_{NN}}\approx 20$ GeV at the Cern Super Proton Synchrotron (SPS) and becomes a correction at $\sqrt{s_{NN}}\approx 6$ TeV at the CERN Large Hadron Collider (LHC). $\J$ production at the CERN SPS is well described by hard QCD, when the larger absorption cross sections of the $\chi$ states predicted by QCD are taken into account. We predict an $A$-dependent polarization of the $\chi$ states. The expansion of small wave packets is discussed.

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