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

Journal Article · Fri Apr 01 00:00:00 EDT 2011 · Phys.Rev.D

DOI:https://doi.org/10.1103/PhysRevD.83.071503· OSTI ID:1053008

Leonard Gamberg, Asmita Mukherjee, Piet J. Mulders

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.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: FG02-07ER41460; AC05-06OR23177
• OSTI ID: 1053008
• Report Number(s): JLAB-THY-11-1470; DOE/OR/23177-2081; arXiv:1010.4556; Integrated Infrastructure Initiative Hadron Physics 2 (Grant 227431)
• Journal Information: Phys.Rev.D, Vol. 83, Issue 07
• Country of Publication: United States
• Language: English

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