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Foundations of Perturbative QCD by John Collins

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14

Inclusive processes in hadron-hadron collisions

In this chapter, I treat inclusive hard processes in hadron-hadron collisions. These give some of the most important practical applications of factorization. But the actual derivation has substantial extra difficulties, compared with other processes we have examined.

Technically the extra difficulties concern the Glauber region. In e+e annihilation or SIDIS, we deformed loop momenta out of the Glauber region in individual (cut) graphs. But this is no longer possible in hadron-hadron collisions. This situation results from interactions between the spectator parts of the beam hadrons, as I will illustrate by an example in Sec. 14.3. To get factorization, we will need a sum over cuts of the graphs, ...

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