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HK: Fachverband Physik der Hadronen und Kerne

HK 16: Elektromagnetische und Hadronische Sonden

HK 16.1: Gruppenbericht

Dienstag, 11. März 2008, 08:30–09:00, 1C

Photoproduction of Hadron Pairs in longitudinally polarized Lepton-Nucleon Collisions at NLO accuracy — •Christof Hendlmeier¹, Marco Stratmann², and Andreas Schaefer¹ — ¹Institut fuer Theoretische Physik, Universitaet Regensburg, 93040 Regensburg — ²Radiation Laboratory, RIKEN, Wako, Saitama 351-0198, Japan

We consider the photoproduction of two hadrons in longitudinally polarized lepton-nucleon collisions within the framework of perturbative QCD at the Next-to-Leading Order accuracy. We give the theoretical framework for both a complete analytic calculation and a Monte-Carlo approach based on the phase-space slicing method.

After comparing the two models and illustrating how to obtain the experimentally relevant observables, a phenomenological study of the photoproduction of hadron pairs at high transverse momenta is presented.

We show theoretical predictions for the relevant cross sections at COMPASS and HERMES kinematics as well as theoretical uncertainties. The main goal of these studies is to extract the largely unknown polarization Δg of gluons in the nucleon.

This work is supported by BMBF.