Axial-vector nucleon-to-delta transition form factors using the complex-mass renormalization scheme

Abstract

We investigate the axial-vector nucleon-to-delta transition form factors in the framework of relativistic baryon chiral perturbation theory at the one-loop order using the complex-mass renormalization scheme. We determine the available six free parameters by fitting to an empirical parametrization of the form factors obtained from the BNL neutrino bubble chamber experiments. A unique feature of our calculation is the prediction of a non-vanishing form factor $C_3^A(Q^2)$. Moreover, our results show a surprising sensitivity to the coupling constant ${\text{g}}_1$ of the leading-order Lagrangian ${\mathcal{L}}_{\pi \Delta }^{(1)}$.

Comments: 22 pages, 8 figures