A model independent analysis of gluonic pole matrix elements and universality of TMD fragmentation functions
High Energy Physics - Phenomenology
2011-05-05 v3 High Energy Physics - Experiment
High Energy Physics - Theory
Nuclear Theory
Abstract
Gluonic pole matrix elements explain the appearance of single spin asymmetries (SSA) in high-energy scattering processes. They involve a combination of operators which are odd under time reversal (T-odd). Such matrix elements appear in principle both for parton distribution functions and parton fragmentation functions. We show that for parton fragmentation functions these gluonic pole matrix elements vanish as a consequence of the analytic structure of scattering amplitudes in Quantum Chromodynamics. This result is important in the study of the universality of transverse momentum dependent (TMD) fragmentation functions.
Keywords
Cite
@article{arxiv.1010.4556,
title = {A model independent analysis of gluonic pole matrix elements and universality of TMD fragmentation functions},
author = {Leonard Gamberg and Asmita Mukherjee and Piet J. Mulders},
journal= {arXiv preprint arXiv:1010.4556},
year = {2011}
}
Comments
5 pages, 5 figures, version to appear in Phys. Rev. D