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Only about 10 % of the hidden charm actually goes into charmonium production. The color evaporation 2 model does not attempt to specify the color neutralisation process, but simply assumes that each charmonium state i gets a fixed fraction of the cake: *<(*)=/<*Sf(*), (5) 22 where i = J/ip,Xc>-~ a n d the fi are constants. The first prediction of the model, the energy independence of production ratios of different charmonium states is found to be well satisfied for ijj'/iJ/i') and x/(J/V0- The values of fi can thus be determined at one collision energy to predict the energy dependence of the cross-sections.

All hard processes have a common basic structure. In the collision of two hadrons, a parton from one collision partner interacts with a parton from the other. The parton content of the hadrons is specified by the parton dis- 20 tribution functions (PDF's) g(x),q(x) and q{x), for gluons, quarks and antiquarks, respectively. These PDF's are determined from data on deep inelastic scattering of leptons on hadrons, making use of sum rules derived from the conservation of momentum, charge, etc. Given the PDF's and the perturbative interaction between the partons, all but the final hadronization of a hard process is determined.

The parton content of the hadrons is specified by the parton dis- 20 tribution functions (PDF's) g(x),q(x) and q{x), for gluons, quarks and antiquarks, respectively. These PDF's are determined from data on deep inelastic scattering of leptons on hadrons, making use of sum rules derived from the conservation of momentum, charge, etc. Given the PDF's and the perturbative interaction between the partons, all but the final hadronization of a hard process is determined. In the next section, we shall see specific examples of this structure.

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A Basis for theTop Homology of a Generalized Partition Lattice


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