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Using the combined version of light-quark (qq̄→bb̄) and gluon-gluon (gg→bb̄) fusion mechanisms for hadronic Υ(9.5) production, we give predictions for xF distributions using pion and proton beams, and for various total-cross-section beam ratios. In addition, we make a detailed comparison of counting-rule-like nucleonic and pionic parton distributions with those predicted by dynamical quantum-chromodynamics (QCD) calculations, and give analytic parametrizations of their QCD x and Q² dependence.
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Owens et al. (1978) studied this question.
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