Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 14: Hadron Structure and Spectroscopy II

HK 14.4: Talk

Monday, March 16, 2009, 17:45–18:00, H-ZO 30

Partonic pole matrix elements for fragmentation — •Stephan Meißner¹ and Andreas Metz² — ¹Institut für Theoretische Physik II, Ruhr-Universität Bochum, Germany — ²Department of Physics, Temple University, Philadelphia, USA

In the parton picture hard physical processes can conveniently be described in terms of parton distribution functions (PDFs) and fragmentation functions (FFs). While it is sufficient to consider only two-parton correlation functions at leading twist, three-parton correlation functions need to be taken into account at subleading twist.

Of these three-parton correlation functions the partonic pole matrix elements (PPMEs) are of particular interest, as they are connected to single spin asymmetries and universality breaking terms of PDFs and FFs. So far the studies in this field mostly dealt with PPMEs for PDFs, while PPMEs for FFs were only considered within models. We, however, obtained new, model-independent information on PPMEs for FFs. Our results as well as their physical implications will be presented in this talk.