Two pion electroproduction

Abstract

We have extended a model for the $\gamma N\to \pi \pi N$ reaction to virtual photons and selected the diagrams which have a $\Delta$ in the final state. The agreement found with the ${\gamma }_{v}p\to {\Delta }^0{\pi }^{+}$ and ${\gamma }_{v}p\to {\Delta }^{++}{\pi }^{-}$ reactions is good. The sensitivity of the results to $N\Delta$ transition form factors is also studied. The present reaction, selecting a particular final state, is an extra test for models of the ${\gamma }_{v}N\to \pi \pi N$ amplitude.

4 pages, 2 figures, Talk given at Meson 2000 Workshop, Krakow, Poland, 19-23 May 2000