Do fragmentation functions in factorization theorems correctly treat non-perturbative effects?
High Energy Physics - Phenomenology
2017-09-05 v1
Abstract
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
Keywords
Cite
@article{arxiv.1610.09994,
title = {Do fragmentation functions in factorization theorems correctly treat non-perturbative effects?},
author = {John Collins},
journal= {arXiv preprint arXiv:1610.09994},
year = {2017}
}
Comments
10 pages. To appear in Proceedings of QCD Evolution 2016 Workshop, May 30-June 3