Transverse moments of TMD parton densities and ultraviolet divergences
Abstract
I review some open questions relating to the large transverse momentum divergences in transverse moments of transverse momentum dependent (TMD) parton correlation functions. I also explain, in an abbreviated and summarized form, recent work that shows that the resulting violations of a commonly used integral relation are not perturbatively suppressed. I argue that this implies a need for more precise definitions for the correlation functions used to describe transverse moments.
- Publication:
-
Modern Physics Letters A
- Pub Date:
- December 2020
- DOI:
- 10.1142/S0217732320300219
- arXiv:
- arXiv:2008.05351
- Bibcode:
- 2020MPLA...3530021R
- Keywords:
-
- QCD;
- perturbation theory;
- transverse momentum dependence;
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment;
- Nuclear Theory
- E-Print:
- 11 pages, review, version published in Modern Physics Letters A, Originally prepared for DIS2020, canceled due to the Covid-19 epidemic