Author:
Bibrzycki Ł.,Bydžovský P.,Kamiński R.,Szczepaniak A. P.
Abstract
We show that the cross section of the Δ(1230) production in the γp → pπ+ π− reaction at forward angles and with unpolarized photons can be described in terms of gauge invariant one pion t-channel exchange amplitudes. Proper description of the polarized cross sections requires, however, the inclusion of contributions from the baryon exchanges.