TMD factorization and evolution at large $b_T$

John Collins; Ted C. Rogers

TMD factorization and evolution at large $b_T$

High Energy Physics - Phenomenology 2015-07-21 v1

Authors: John Collins , Ted C. Rogers

Abstract

In using transverse-momentum-dependent (TMD) parton densities and fragmentation functions, important non-perturbative information is at large transverse position $b_T$ . This concerns both the TMD functions and their evolution. Fits to high energy data tend to predict too rapid evolution when extrapolated to low energies where larger values of $b_T$ dominate. I summarize a new analysis of the issues. It results in a proposal for much weaker $b_T$ dependence at large $b_T$ for the evolution kernel, while preserving the accuracy of the existing fits. The results are particularly important for using transverse-spin-dependent functions like the Sivers function.

Keywords

perturbative qcd evolution parton distribution functions

Cite

@article{arxiv.1507.05542,
  title  = {TMD factorization and evolution at large $b_T$},
  author = {John Collins and Ted C. Rogers},
  journal= {arXiv preprint arXiv:1507.05542},
  year   = {2015}
}

Comments

To appear in the proceedings of the XXIII International Workshop on Deep-Inelastic Scattering and Related Subjects, April 27 - May 1, 2015, Dallas, Texas, USA

TMD factorization and evolution at large $b_T$

Abstract

Keywords

Cite

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