Model independent analysis of gluonic pole matrix elements and universality of transverse-momentum-dependent fragmentation functions

L. P. Gamberg, A. Mukherjee, P. J. Mulders

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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.

Original languageEnglish (US)
Article number071503
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume83
Issue number7
DOIs
Publication statusPublished - Apr 15 2011

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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