The N→Δ weak vertex plays a crucial role in one pion production in neutrino–nucleon and neutrino–nucleus scattering for πN invariant masses below 1.4 GeV. This process is significant in understanding the weak interaction and its impact on the nucleon structure. The study of one pion production is essential in advancing our knowledge of the neutrino-nucleon interaction, which is vital for the development of future neutrino detectors and the understanding of neutrino oscillations. Furthermore, this research has implications for the study of nucleon structure and the weak interaction, making it a crucial area of investigation in the field of particle physics.