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Heidelberg 2007 – scientific programme

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T: Fachverband Teilchenphysik

T 306: QCD Theorie II

T 306.2: Talk

Wednesday, March 7, 2007, 17:00–17:15, KIP SR 2.401

Deep Inelastic Pion Electroproduction at ThresholdVladimir Braun1, Dimitri Ivanov2, Alexander Lenz1, and •Andreas Peters11University 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.

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