Erratum to: The formation of P11(1470) resonance in the γ-n interaction

Double pion photoproduction on the nucleon: study of the isospin channels

“…For the γn → π − π 0 p isospin channel (Fig. 9), the theory is a bit below the experimental results [3,4], but the trend of the energy dependence is well reproduced.…”

“…However, in connection with the data of refs. [3,4] for the γn → π + π − n and γn → π − π 0 p reaction, we should point out that there is some disagreement between the results of the same experiments for the γp → π + π − p channel and the experimental results of ref. [1,8] (see Fig.…”

“…For the isospin channels on the neutron we have found also some discrepancies with the old data of refs. [3,4], but as we have already mentioned, these experiments should be improved.…”

“…[11] we also showed differential cross sections and invariant-mass distributions for the γp → π + π − p channel). We show results up to E γ = 800 MeV , where the new experiments at Mainz concentrate, and we compare our results with the available experimental data [1,2,3,4,8]. In the errorbars of the DAPHNE data [8] we have plotted only the statistical errors.…”

“…These reactions have been extensively studied experimentally in the past ( [1,2,3,4,5,6,7]). New improvements in experimental techniques and facilities have reopened the study of these reactions at Mainz, with two experiments on the proton [8,9].…”