2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/170897Single pion production in neutrino-nucleon scattering is discussed. The neutrino energies characteristic for T2K project are considered. Two new parameterizations of $C_5^A$ axial form factor are proposed. Both of them are obtained in simultaneous fit to ANL and BNL data. One of them (which fits better to BNL data) leads to $dσ/dQ^2$ differential cross section which is significantly reduced at low $Q^2$.10 pages, 3 figures, talk given at Twenty Seventh International Workshop on Nuclear Theory, June 23 - 28, 2008, Rila mountains, BulgariaHigh Energy Physics - Phenomenologytext