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

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.

preprint2011arXivOpen access
Leonard GambergAsmita MukherjeePiet J. Mulders
hep-exhep-phnucl-thhep-th
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Leonard GambergAsmita MukherjeePiet J. Mulders

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