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Foundations of Perturbative QCD by John Collins

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12

Fragmentation functions: e+e annihilation to hadrons, and SIDIS

We now extend our treatment of factorization to cover the distribution of final-state hadrons in hard processes.

The simplest process is the cross section for inclusive one-hadron production in e+e annihilation, Fig. 12.1,

image

where the hadron is typically a pion, and, as usual, we work to lowest order in electroweak interactions. Kinematically the process is the same as inclusive DIS, except that certain particles are crossed between the initial and final states. We will see that the structure of the factorization theorem, (12.21), is the same as for DIS. The differences concern ...

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