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Foundations of Perturbative QCD by John Collins

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9

Corrections to the parton model in QCD

In Ch. 8, factorization was formulated for DIS. The proofs were, however, restricted to non-gauge theory. But the results remain true in QCD, with some complications to be treated in Ch. 11.

So in this chapter we will simply assume factorization holds in QCD, and on that basis introduce methods of applying it phenomenologically. In QCD, with an unpolarized target, we will calculate: (a) the first correction terms to the hard scattering for DIS, and (b) the leading term in the kernel for DGLAP evolution of quark and gluon densities. These are the primary phenomenological tools for quantitatively analyzing DIS in QCD.

The calculations also provide an opportunity to introduce some of the complications that ...

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