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We present new parameterizations of vector and axial nucleon form factors. Wemaintain an excellent descriptions of the form factors at low momentumtransfers, where the spatial structure of the nucleon is important, and use theNachtman scaling variable \xi to relate elastic and inelastic form factors andimpose quark-hadron duality constraints at high momentum transfers where thequark structure dominates. We use the new vector form factors to re-extractupdated values of the axial form factor from neutrino experiments on deuterium.We obtain an updated world average value from neutrino and pionelectroproduction experiments of M_A = 1.0144 +- 0.0136 GeV/c2. Ourparameterizations are useful in modeling atmospheric neutrino interactions(e.g. for neutrino oscillations experiments)

Modeling Atmospheric Neutrino Interactions: Duality Constrained Parameterization of Vector and Axial Nucleon Form Factors