PoS - Proceedings of Science
Volume 284 - QCD Evolution 2016 (QCDEV2016) - Monday, May 30, 2016 - Morning 1
Do fragmentation functions in factorization theorems correctly treat non-perturbative effects?
J. Collins
Full text: pdf
Pre-published on: February 10, 2017
Published on: March 28, 2017
Current all-orders proofs of factorization of hard processes
are made by extracting the leading power behavior of Feynman graphs,
i.e., by extracting asymptotics strictly order-by-order in
perturbation theory. The resulting parton densities and
fragmentation functions include non-perturbative effects. I show
how there are missing elements in the proofs; these are related to
and exemplified by string and cluster models of hadronization. The
proofs rely on large rapidity differences between different parts of
graphs for the process; but in reality large rapidity gaps are
filled in.
DOI: https://doi.org/10.22323/1.284.0003
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