Results of the measurement of the transverse and longitudinal cross-section for coincident electro-production of positively charged pions on protons measured in parallel kinematics at the invariant mass of W = 1125 MeV and at three fourmomentum transfers q 2 = −0.117, −0.195 and −0.273 GeV2 are presented. An axial-mass parameter of high accuracy was extracted from a preliminary analysis of the transverse cross-section within the Mainz effective Lagrangian model of the nucleon. The value supports the prediction of the chiral perturbation theory that pion-loop corrections effectively increase the value of the axial mass extracted from pion electro-production data relative to that from neutrino scattering.Opisuju se ishodi mjerenja poprečnog i uzdužnog udarnog presjeka za višestruku elektrotvorbu pozitivnih piona u paralelnoj kinematici
