Heidelberg 2007 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 306: QCD Theorie II
T 306.2: Vortrag
Mittwoch, 7. März 2007, 17:00–17:15, KIP SR 2.401
Deep Inelastic Pion Electroproduction at Threshold — Vladimir Braun1, Dimitri Ivanov2, Alexander Lenz1, and •Andreas Peters1 — 1University of Regensburg, Regensburg, Germany — 2Sobolev Institute of Mathematics, Novosibirsk, Russia
We consider the cross section of the deep inelastic pion electroproduction on a proton target at threshold for $Q^2$ in the region $5-10$~GeV$^2$. The corresponding amplitudes are described in terms of two form factors which we calculate using light cone sum rules (LCSR) to leading order in QCD and including higher twist corrections. Our results suggest a considerable change from a small $Q^2$ region that can be treated in the soft pion limit using current algebra. In particular, we obtain a $\pi^0$ to $\pi^+$ producton ratio of order 1/3 and significant nucleon helicity-flip contributions.