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Foundations of Perturbative QCD by John Collins

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7

Parton theory: further developments

In the previous chapter, we formalized the parton model in a simple quantum field theory. A number of further developments follow fairly simply, and this chapter’s purpose is to give an account of them, before we go on to the full QCD treatment.

We first extend the parton model for DIS to the very important case of charged-current weak-interaction processes. Then we examine a particularly influential form of perturbation theory: light-front (or x+-ordered) perturbation theory. After that I present the light-front quantization of gauge theories, a natural extension of what we did earlier for non-gauge theories. We will thereby be able to introduce appropriate definitions for parton densities in a gauge theory, ...

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