N-Delta(1232) axial form factors from weak pion production

TL;DR

This paper determines N-Delta(1232) axial form factors from neutrino-induced pion production data using an advanced model, revealing deviations from theoretical expectations that could affect neutrino oscillation experiments.

Contribution

It provides the first detailed extraction of N-Delta axial form factors incorporating background mechanisms and deuteron effects, highlighting potential implications for neutrino physics.

Findings

Violations of the off-diagonal Goldberger-Treiman relation at 2 sigma level

Impact on background calculations for T2K and MiniBooNE

Refined axial form factors from combined data and modeling

Abstract

The N-Delta axial form factors are determined from neutrino induced pion production ANL & BNL data by using a state of the art theoretical model, which accounts both for background mechanisms and deuteron effects. We find violations of the off diagonal Goldberger-Treiman relation at the level of 2 sigma which might have an impact in background calculations for T2K and MiniBooNE low energy neutrino oscillation precision experiments.