A model independent analysis of gluonic pole matrix elements and universality of TMD fragmentation functions

Details A model independent analysis of gluonic pole matrix elements and universality of TMD fragmentation functions A model independent analysis of gluonic pole matrix elements and universality of TMD fragmentation functions

2010-10-21

arxiv.org/abs/1010.4556v3

Phys.Rev.D83:071503,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 5 figures, version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.83.071503

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.

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